feat(ui): Use curves for bettwe animations

Reviewed-on: https://codeberg.org/moxxy/moxxyv2/pulls/161

.gitignore

@@ -52,7 +52,11 @@ app.*.map.json
 **/*.g.dart
 **/*.freezed.dart
 **/*.moxxy.dart
+lib/i18n/*.dart
 
 # Direnv
 .envrc
 .direnv/
+
+# Android artifacts
+.android

.gitlint

@@ -7,7 +7,7 @@ line-length=72
 [title-trailing-punctuation]
 [title-hard-tab]
 [title-match-regex]
-regex=^(ui,service|service,xmpp|feat|test|refactor|xmpp|service|redux|ui|lint|style|docs|build|misc|flake|shared|meta|android|ios|release):.*$
+regex=^(feat|fix|chore|refactor|docs|release|test)\((xmpp|service|ui|shared|meta|tests|i18n)+(,(xmpp|service|ui|shared|meta|tests|i18n))*\): .*$
 
 
 [body-trailing-whitespace]

README.md

@@ -17,7 +17,8 @@ Clone using `git clone --recursive https://github.com/Polynomdivision/moxxyv2.gi
 
 In order to build Moxxy, you need to have [Flutter](https://docs.flutter.dev/get-started/install) set
 up. If you are running NixOS or using Nix, you can also use the Flake at the root of the repository
-by running `nix develop` to get a development shell including everything that is needed.
+by running `nix develop` to get a development shell including everything that is needed. Note
+that if you decide to use the Flake, `ANDROID_HOME` and `ANDROID_AVD_HOME` must be set to the respective directories.
 
 Before building Moxxy, you need to generate all needed data classes. To do this, run
 `flutter pub get` to install all dependencies. Then run `flutter pub run build_runner build` to generate

analysis_options.yaml

@@ -13,3 +13,6 @@ analyzer:
     - "**/*.freezed.dart"
     - "**/*.moxxy.dart"
     - "test/"
+    - "integration_test/"
+    - "lib/service/database/migrations/*.dart"
+    - "lib/i18n/*.dart"

assets/i18n/strings.i18n.json

@@ -0,0 +1,224 @@
+{
+    "@@name": "English",
+    "global": {
+	"title": "Moxxy",
+	"moxxySubtitle": "An experiment into building a modern, easy and beautiful XMPP client.",
+	"dialogAccept": "Okay",
+	"dialogCancel": "Cancel",
+	"yes": "Yes",
+	"no": "No"
+    },
+    "notifications": {
+	"permanent": {
+	    "idle": "Idle",
+	    "ready": "Ready to receive messages",
+	    "connecting": "Connecting...",
+	    "disconnect": "Disconnected",
+	    "error": "Error"
+	}
+    },
+    "messages": {
+	"image": "Image",
+	"video": "Video",
+	"audio": "Audio",
+	"file": "File",
+	"retracted": "The message has been retracted",
+	"retractedFallback": "A previous message has been retracted but your client does not support it"
+    },
+    "errors": {
+	"omemo": {
+	    "couldNotPublish": "Could not publish the cryptographic identity to the server. This means that end-to-end encryption may not work."
+	},
+	"connection": {
+	    "connectionTimeout": "Could not connect to server"
+	},
+	"login": {
+	    "saslFailed": "Invalid login credentials",
+	    "startTlsFailed": "Failed to establish a secure connection",
+	    "noConnection": "Failed to establish a connection",
+	    "unspecified": "Unspecified error"
+	}
+    },
+    "warnings": {
+	"message": {
+	    "integrityCheckFailed": "Could not verify file integrity"
+	}
+    },
+    "pages": {
+	"intro": {
+	    "noAccount": "Have no XMPP account? No worries, creating one is really easy.",
+	    "loginButton": "Login",
+	    "registerButton": "Register"
+	},
+	"login": {
+	    "title": "Login",
+	    "xmppAddress": "XMPP-Address",
+	    "password": "Password",
+	    "advancedOptions": "Advanced options",
+	    "createAccount": "Create account on server"
+	},
+	"conversations": {
+	    "speeddialNewChat": "New chat",
+	    "speeddialJoinGroupchat": "Join groupchat",
+	    "overlaySettings": "Settings",
+	    "noOpenChats": "You have no open chats",
+	    "startChat": "Start a chat"
+	},
+	"conversation": {
+	    "unencrypted": "Unencrypted",
+	    "encrypted": "Encrypted",
+	    "closeChat": "Close chat",
+	    "closeChatConfirmTitle": "Close chat",
+	    "closeChatConfirmSubtext": "Are you sure you want to close this chat?",
+	    "blockUser": "Block user",
+	    "online": "Online",
+	    "retract": "Retract message",
+	    "retractBody": "Are you sure you want to retract the message? Keep in mind that this is only a request that the client does not have to honour.",
+	    "forward": "Forward",
+	    "edit": "Edit"
+	},
+	"addcontact": {
+	    "title": "Add new contact",
+	    "xmppAddress": "XMPP-Address",
+	    "subtitle": "You can add a contact either by typing in their XMPP address or by scanning their QR code",
+	    "buttonAddToContact": "Add to contacts"
+	},
+	"newconversation": {
+	    "title": "Start new chat",
+	    "addContact": "Add contact",
+	    "createGroupchat": "Create groupchat"
+	},
+	"crop": {
+	    "setProfilePicture": "Set as profile picture"
+	},
+	"shareselection": {
+	    "shareWith": "Share with...",
+	    "confirmTitle": "Send file",
+	    "confirmBody": "One or more chats are unencrypted. This means that the file will be leaked to the server. Do you still want to continue?"
+	},
+	"profile": {
+	    "self": {
+		"devices": "Devices"
+	    },
+	    "conversation": {
+		"muteChatTooltip": "Mute chat",
+		"unmuteChatTooltip": "Unmute chat",
+		"muteChat": "Mute",
+		"unmuteChat": "Unmute",
+		"devices": "Devices"
+	    },
+	    "owndevices": {
+		"title": "Own Devices",
+		"thisDevice": "This device",
+		"otherDevices": "Other devices",
+		"deleteDeviceConfirmTitle": "Delete device",
+		"deleteDeviceConfirmBody": "This means that contacts will not be able to encrypt for that device. Continue?",
+		"recreateOwnSessions": "Rebuild sessions",
+		"recreateOwnSessionsConfirmTitle": "Recreate own sessions?",
+		"recreateOwnSessionsConfirmBody": "This will recreate the cryptographic sessions with your own devices. Use only if your own devices throw decryption errors.",
+		"recreateOwnDevice": "Recreate device",
+		"recreateOwnDeviceConfirmTitle": "Recreate own device?",
+		"recreateOwnDeviceConfirmBody": "This will recreate this device's cryptographic identity. It will take some time. If contacts verified your device, they will have to do it again. Continue?"
+	    },
+	    "devices": {
+		"title": "Devices",
+		"recreateSessions": "Rebuild sessions",
+		"recreateSessionsConfirmTitle": "Rebuild sessions?",
+		"recreateSessionsConfirmBody": "This will recreate the cryptographic sessions with your own devices. Use only if your own devices throw decryption errors."
+	    }
+	},
+	"blocklist": {
+	    "title": "Blocklist",
+	    "noUsersBlocked": "You have no users blocked",
+	    "unblockAll": "Unblock all",
+	    "unblockAllConfirmTitle": "Are you sure?",
+	    "unblockAllConfirmBody": "Are you sure you want to unblock all users?",
+	    "unblockJidConfirmTitle": "Unblock ${jid}?",
+	    "unblockJidConfirmBody": "Are you sure you want to unblock ${jid}? You will receive messages from this user again."
+	},
+	"settings": {
+	    "settings": {
+		"title": "Settings",
+		"conversationsSection": "Conversations",
+		"accountSection": "Account",
+		"signOut": "Sign out",
+		"signOutConfirmTitle": "Sign Out",
+		"signOutConfirmBody": "You are about to sign out. Proceed?",
+		"miscellaneousSection": "Miscellaneous",
+		"debuggingSection": "Debugging"
+	    },
+	    "about": {
+		"title": "About",
+		"licensed": "Licensed under GPL3",
+		"viewSourceCode": "View source code"
+	    },
+	    "appearance": {
+		"title": "Appearance",
+		"languageSection": "Language",
+		"language": "App language",
+		"languageSubtext": "Currently selected: $selectedLanguage",
+		"systemLanguage": "Default language"
+	    },
+	    "licenses": {
+		"title": "Open-Source Licenses",
+		"licensedUnder": "Licensed under $license"
+	    },
+	    "conversation": {
+		"title": "Chat",
+		"appearance": "Appearance",
+		"selectBackgroundImage": "Select background image",
+		"selectBackgroundImageDescription": "This image will be the background of all your chats",
+		"removeBackgroundImage": "Remove background image",
+		"removeBackgroundImageConfirmTitle": "Remove background image",
+		"removeBackgroundImageConfirmBody": "Are you sure you want to remove your conversation background image?",
+		"newChatsSection": "New Conversations",
+		"newChatsMuteByDefault": "Mute new chats by default",
+		"newChatsE2EE": "Enable end-to-end encryption by default. WARNING: Experimental"
+	    },
+	    "debugging": {
+		"title": "Debugging options",
+		"generalSection": "General",
+		"generalEnableDebugging": "Enable debugging",
+		"generalEncryptionPassword": "Encryption password",
+		"generalEncryptionPasswordSubtext": "The logs may contain sensitive information so pick a strong passphrase",
+		"generalLoggingIp": "Logging IP",
+		"generalLoggingIpSubtext": "The IP the logs should be sent to",
+		"generalLoggingPort": "Logging Port",
+		"generalLoggingPortSubtext": "The IP the logs should be sent to"
+	    },
+	    "network": {
+		"title": "Network",
+		"automaticDownloadsSection": "Automatic Downloads",
+		"automaticDownloadsText": "Moxxy will automatically download files on...",
+		"automaticDownloadsMaximumSize": "Maximum Download Size",
+		"automaticDownloadsMaximumSizeSubtext": "The maximum file size for a file to be automatically downloaded",
+		"wifi": "Wifi",
+		"mobileData": "Mobile data"
+	    },
+	    "privacy": {
+		"title": "Pricacy",
+		"generalSection": "General",
+		"showContactRequests": "Show contact requests",
+		"showContactRequestsSubtext": "This will show people who added you to their contact list but sent no message yet",
+		"profilePictureVisibility": "Make profile picture public",
+		"profilePictureVisibilitSubtext": "If enabled, everyone can see your profile picture. If disabled, only users on your contact list can see your profile picture.",
+		"autoAcceptSubscriptionRequests": "Auto-accept subscription requests",
+		"autoAcceptSubscriptionRequestsSubtext": "If enabled, subscription requests will be automatically accepted if the user is in the contact list.",
+		"conversationsSection": "Conversation",
+		"sendChatMarkers": "Send chat markers",
+		"sendChatMarkersSubtext": "This will tell your conversation partner if you received or read a message",
+		"sendChatStates": "Send chat states",
+		"sendChatStatesSubtext": "This will show your conversation partner if you are typing or looking at the chat",
+		"redirectsSection": "Redirects",
+		"redirectText": "This will redirect $serviceName links that you tap to a proxy service, e.g. $exampleProxy",
+		"currentlySelected": "Currently selected: $proxy",
+		"redirectsTitle": "$serviceName Redirect",
+		"cannotEnableRedirect": "Cannot enable $serviceName redirects",
+		"cannotEnableRedirectSubtext": "You must first set a proxy service to redirect to. To do so, tap the field next to the switch.",
+		"urlEmpty": "URL cannot be empty",
+		"urlInvalid": "Invalid URL",
+		"redirectDialogTitle": "$serviceName Redirect"
+	    }
+	}
+    }
+}

assets/i18n/strings_de.i18n.json

@@ -0,0 +1,224 @@
+{
+    "@@name": "Deutsch",
+    "global": {
+	"title": "Moxxy",
+	"moxxySubtitle": "Ein Experiment im Entwickeln eines modernen, einfachen und schönen XMPP-Clients.",
+	"dialogAccept": "Okay",
+	"dialogCancel": "Abbrechen",
+	"yes": "Ja",
+	"no": "Nein"
+    },
+    "notifications": {
+	"permanent": {
+	    "idle": "Bereit",
+	    "ready": "Bereit zum Nachrichtenempfang",
+	    "connecting": "Verbinde...",
+	    "disconnect": "Keine Verbindung",
+	    "error": "Fehler"
+	}
+    },
+    "messages": {
+	"image": "Bild",
+	"video": "Video",
+	"audio": "Audio",
+	"file": "Datei",
+	"retracted": "Die Nachricht wurde zurückgezogen",
+	"retractedFallback": "Eine vorherige Nachricht wurde zurückgezogen. Dein Client unterstüzt dies jedoch nicht"
+    },
+    "errors": {
+	"omemo": {
+	    "couldNotPublish": "Konnte die kryptographische Identität nicht auf dem Server veröffentlichen. Ende-zu-Ende-Verschlüsselung funktioniert eventuell nicht."
+	},
+	"connection": {
+	    "connectionTimeout": "Verbindung zum Server nicht möglich"
+	},
+	"login": {
+	    "saslFailed": "Ungültige Logindaten",
+	    "startTlsFailed": "Konnte keine sichere Verbindung zum Server aufbauen",
+	    "noConnection": "Konnte keine Verbindung zum Server aufbauen",
+	    "unspecified": "Unbestimmter Fehler"
+	}
+    },
+    "warnings": {
+	"message": {
+	    "integrityCheckFailed": "Konnte Integrität der Datei nicht überprüfen"
+	}
+    },
+    "pages": {
+	"intro": {
+	    "noAccount": "Kein XMPP-Account vorhanden? Einen zu erstellen ist sehr einfach.",
+	    "loginButton": "Einloggen",
+	    "registerButton": "Registrieren"
+	},
+	"login": {
+	    "title": "Login",
+	    "xmppAddress": "XMPP-Adresse",
+	    "password": "Passwort",
+	    "advancedOptions": "Fortgeschrittene Optionen",
+	    "createAccount": "Account auf dem Server erstellen"
+	},
+	"conversations": {
+	    "speeddialNewChat": "Neuer chat",
+	    "speeddialJoinGroupchat": "Gruppenchat beitreten",
+	    "overlaySettings": "Einstellungen",
+	    "noOpenChats": "Du hast keine offenen chats",
+	    "startChat": "Einen chat anfangen"
+	},
+	"conversation": {
+	    "unencrypted": "Unverschlüsselt",
+	    "encrypted": "Verschlüsselt",
+	    "closeChat": "Chat schließen",
+	    "closeChatConfirmTitle": "Chat schließen",
+	    "closeChatConfirmSubtext": "Bist Du dir sicher, dass du den Chat schließen möchtest?",
+	    "blockUser": "Nutzer blockieren",
+	    "online": "Online",
+	    "retract": "Nachricht löschen",
+	    "retractBody": "Bist du dir sicher, dass du die Nachricht löschen willst? Bedenke, dass dies nur eine Bitte ist, die dein gegenüber nicht beachten muss.",
+	    "forward": "Weiterleiten",
+	    "edit": "Bearbeiten"
+	},
+	"addcontact": {
+	    "title": "Neuen Kontakt hinzufügen",
+	    "xmppAddress": "XMPP-Adresse",
+	    "subtitle": "Du kannst einen Kontakt hinzufügen, indem Du entweder die XMPP-Adresse eingibst oder den QR-Code deines Kontaktes scannst",
+	    "buttonAddToContact": "Kontakt hinzufügen"
+	},
+	"newconversation": {
+	    "title": "Neuer chat",
+	    "addContact": "Kontakt hinzufügen",
+	    "createGroupchat": "Gruppenchat erstellen"
+	},
+	"crop": {
+	    "setProfilePicture": "Als Profilbild festlegen"
+	},
+	"shareselection": {
+	    "shareWith": "Teilen mit...",
+	    "confirmTitle": "Dateien senden?",
+	    "confirmBody": "Einer oder mehr Chats sind unverschlüsselt. Das bedeutet, dass die Dateien dem Server unverschlüsselt vorliegen. Dateien trotzdem senden?"
+	},
+	"profile": {
+	    "self": {
+		"devices": "Geräte"
+	    },
+	    "conversation": {
+		"muteChatTooltip": "Chat stummschalten",
+		"unmuteChatTooltip": "Chat lautstellen",
+		"muteChat": "Stummschalten",
+		"unmuteChat": "Lautstellen",
+		"devices": "Geräte"
+	    },
+	    "owndevices": {
+		"title": "Eigene Geräte",
+		"thisDevice": "Dieses Gerät",
+		"otherDevices": "Andere Geräte",
+		"deleteDeviceConfirmTitle": "Gerät löschen",
+		"deleteDeviceConfirmBody": "Das bedeutet, dass Kontakte für dieses Gerät nichtmehr verschlüsseln können. Fortfahren?",
+		"recreateOwnSessions": "Sessions neuerstellen",
+		"recreateOwnSessionsConfirmTitle": "Eigene Sessions neuerstellen?",
+		"recreateOwnSessionsConfirmBody": "Das wird alle kryptographischen Sessions mit den eigenen Geräten neuerstellen. Verwende dies nur, wenn deine eigenen Geräte Entschlüsselungsfehler erzeugen.",
+		"recreateOwnDevice": "Gerät neuerstellen",
+		"recreateOwnDeviceConfirmTitle": "Gerät neuerstellen?",
+		"recreateOwnDeviceConfirmBody": "Das wird die kryptographische Identität dieses Geräts neu erstellen. Wenn Kontakte die kryptographische Indentität verifiziert haben, dann müssen diese es erneut tun. Fortfahren?"
+	    },
+	    "devices": {
+		"title": "Devices",
+		"recreateSessions": "Rebuild sessions",
+		"recreateSessionsConfirmTitle": "Rebuild sessions?",
+		"recreateSessionsConfirmBody": "This will recreate the cryptographic sessions with your own devices. Use only if your own devices throw decryption errors."
+	    }
+	},
+	"blocklist": {
+	    "title": "Blockliste",
+	    "noUsersBlocked": "Du hast niemanden blockiert",
+	    "unblockAll": "Alle entblocken",
+	    "unblockAllConfirmTitle": "Alle entblocken",
+	    "unblockAllConfirmBody": "Bist Du dir sicher, dass du alle geblockten Personen entblocken möchtest?",
+	    "unblockJidConfirmTitle": "${jid} entblocken?",
+	    "unblockJidConfirmBody": "Bist du dir sicher, dass du ${jid} entblocken möchtest? Du wirst wieder Nachrichten von dieser Person erhalten können."
+	},
+	"settings": {
+	    "settings": {
+		"title": "Einstellungen",
+		"conversationsSection": "Unterhaltungen",
+		"accountSection": "Account",
+		"signOut": "Abmelden",
+		"signOutConfirmTitle": "Abmelden",
+		"signOutConfirmBody": "Du bist dabei dich abzumelden. Fortfahren?",
+		"miscellaneousSection": "Unterschiedlich",
+		"debuggingSection": "Debugging"
+	    },
+	    "about": {
+		"title": "Über",
+		"licensed": "Lizensiert unter GPL3",
+		"viewSourceCode": "Quellcode anschauen"
+	    },
+	    "appearance": {
+		"title": "Aussehen",
+		"languageSection": "Sprache",
+		"language": "Appsprache",
+		"languageSubtext": "Aktuell ausgewählt: $selectedLanguage",
+		"systemLanguage": "Systemsprache"
+	    },
+	    "licenses": {
+		"title": "Open-Source Lizenzen",
+		"licensedUnder": "Lizensiert unter $license"
+	    },
+	    "conversation": {
+		"title": "Chat",
+		"appearance": "Aussehen",
+		"selectBackgroundImage": "Hintergrundbild auswählen",
+		"selectBackgroundImageDescription": "Dieses Bild wird als Hintergrundbild in allen Chats verwendet",
+		"removeBackgroundImage": "Hintergrundbild entfernen",
+		"removeBackgroundImageConfirmTitle": "Hintergrundbild entfernen",
+		"removeBackgroundImageConfirmBody": "Bist Du dir sicher, dass Du das Hintergrundbild entfernen möchtest?",
+		"newChatsSection": "Neue Chats",
+		"newChatsMuteByDefault": "Neue Chats standardmäßig stummschalten",
+		"newChatsE2EE": "Ende-zu-Ende-Verschlüsselung standardmäßig aktivieren. WARNUNG: Experimentell"
+	    },
+	    "debugging": {
+		"title": "Debuggingoptionen",
+		"generalSection": "Generell",
+		"generalEnableDebugging": "Debugging einschalten",
+		"generalEncryptionPassword": "Verschlüsselungspasswort",
+		"generalEncryptionPasswordSubtext": "Die Logs enthalten eventuell sensible Daten. Wähle also daher eine starke Passphrase",
+		"generalLoggingIp": "Logging-IP",
+		"generalLoggingIpSubtext": "Die IP-Adresse an die die Logs gesendet werden",
+		"generalLoggingPort": "Logging-Port",
+		"generalLoggingPortSubtext": "Der Port an den die Logs gesendet werden"
+	    },
+	    "network": {
+		"title": "Netzwerk",
+		"automaticDownloadsSection": "Automatische Downloads",
+		"automaticDownloadsText": "Moxxy läd Dateien automatisch herunter, wenn verbunden mit...",
+		"automaticDownloadsMaximumSize": "Maximale Downloadgröße",
+		"automaticDownloadsMaximumSizeSubtext": "Die maximale Dateigröße, die automatisch heruntergeladen werden soll",
+		"wifi": "Wifi",
+		"mobileData": "Mobile Daten"
+	    },
+	    "privacy": {
+		"title": "Privatsphäre",
+		"generalSection": "Generell",
+		"showContactRequests": "Kontaktanfragen zeigen",
+		"showContactRequestsSubtext": "Dies zeigt Personen in der Chatübersicht an, die Dich zu ihrer Kontaktliste hinzugefügt haben, aber noch keine Nachricht gesendet haben",
+		"profilePictureVisibility": "Öffentliches Profilbild",
+		"profilePictureVisibilitSubtext": "Wenn aktiviert, dann kann jeder Dein Profilbild sehen. Wenn deaktiviert, dann können nur Personen aus deiner Kontaktliste kein Profilbild sehen",
+		"autoAcceptSubscriptionRequests": "Subscriptionanfragen automatisch annehmen",
+		"autoAcceptSubscriptionRequestsSubtext": "Wenn aktiviert, dann werden Subscriptionanfragen automatisch angenommen, wenn die Person in deiner Kontaktliste ist",
+		"conversationsSection": "Unterhaltungen",
+		"sendChatMarkers": "Chatmarker senden",
+		"sendChatMarkersSubtext": "Dies teilt Deinem Gesprächspartner mit, ob du Nachrichten empfangen oder gelesen hast",
+		"sendChatStates": "Chatstates senden",
+		"sendChatStatesSubtext": "Dies teilt Deinem Gesprächspartner mit, ob du gerade im Chat aktiv bist oder schreibst",
+		"redirectsSection": "Weiterleitungen",
+		"redirectText": "Dies leitet Links von $serviceName, die du öffnest, an einen Proxydienst weiter, wie zum Beispiel $exampleProxy",
+		"currentlySelected": "Aktuell ausgewählt: $proxy",
+		"redirectsTitle": "${serviceName}weiterleitung",
+		"cannotEnableRedirect": "Kann ${serviceName}weiterleitung nicht aktivieren",
+		"cannotEnableRedirectSubtext": "Du must zuerst einen Proxydienst auswählen. Dazu berühre das Feld neben dem Schalter.",
+		"urlEmpty": "URL kann nicht leer sein",
+		"urlInvalid": "Ungültige URL",
+		"redirectDialogTitle": "${serviceName}weiterleitung"
+	    }
+	}
+    }
+}

build.yaml

@@ -0,0 +1,7 @@
+targets:
+  $default:
+    builders:
+      slang_build_runner:
+        options:
+          input_directory: assets/i18n
+          output_directory: lib/i18n

flake.nix

@@ -44,9 +44,7 @@
 	      ripgrep # General utilities
       ];
 
-      ANDROID_HOME = "${android.androidsdk}/libexec/android-sdk";
       JAVA_HOME = pinnedJDK;
-      ANDROID_AVD_HOME = (toString ./.) + "/.android/avd";
     };
   });
 }

integration_test/backoff_test.dart

@@ -0,0 +1,67 @@
+import 'package:get_it/get_it.dart';
+import 'package:logging/logging.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxmpp_socket_tcp/moxxmpp_socket_tcp.dart';
+import 'package:moxxyv2/service/connectivity.dart';
+import 'package:moxxyv2/service/moxxmpp/reconnect.dart';
+import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:test/test.dart';
+
+class StubConnectivityService extends ConnectivityService {
+  StubConnectivityService() : super();
+
+  @override
+  ConnectivityResult get currentState => ConnectivityResult.wifi;
+}
+
+void main() {
+  Logger.root.level = Level.ALL;
+  Logger.root.onRecord.listen((record) {
+    print('${record.level.name}: ${record.time}: ${record.message}');
+  });
+  final log = Logger('FailureReconnectionTest');
+  GetIt.I.registerSingleton<ConnectivityService>(StubConnectivityService());
+
+  test('Failing an awaited connection with MoxxyReconnectionPolicy', () async {
+    var errors = 0;
+    final connection = XmppConnection(
+      MoxxyReconnectionPolicy(maxBackoffTime: 1),
+      TCPSocketWrapper(false),
+    );
+    connection.registerFeatureNegotiators([
+      StartTlsNegotiator(),
+    ]);
+    connection.registerManagers([
+      DiscoManager(),
+      RosterManager(),
+      PingManager(),
+      MessageManager(),
+      PresenceManager('http://moxxmpp.example'),
+    ]);
+    connection.asBroadcastStream().listen((event) {
+      if (event is ConnectionStateChangedEvent) {
+        if (event.state == XmppConnectionState.error) {
+          errors++;
+        }
+      }
+    });
+
+    connection.setConnectionSettings(
+      ConnectionSettings(
+        jid: JID.fromString('testuser@no-sasl.badxmpp.eu'),
+        password: 'abc123',
+        useDirectTLS: true,
+        allowPlainAuth: true,
+      ),
+    );
+
+    final result = await connection.connectAwaitable();
+    log.info('Connection failed as expected');
+    expect(result.success, false);
+    expect(errors, 1);
+
+    log.info('Waiting 20 seconds for unexpected reconnections');
+    await Future.delayed(const Duration(seconds: 20));
+    expect(errors, 1);
+  }, timeout: Timeout.factor(2));
+}

lib/data_classes.yaml

@@ -7,13 +7,15 @@ files:
           - JsonImplementation
         attributes:
           jid: String
-          displayName: String
+          preStart:
+            type: PreStartDoneEvent
+            deserialise: true
       - name: LoginFailureEvent
         extends: BackgroundEvent
         implements:
           - JsonImplementation
         attributes:
-          reason: String
+          reason: String?
       - name: PreStartDoneEvent
         extends: BackgroundEvent
         implements:
@@ -69,8 +71,7 @@ files:
         extends: BackgroundEvent
         implements:
           - JsonImplementation
-      # Send by the service if a message has been received or returned by
-      # [SendMessageCommand].
+      # Send by the service if a message has been received or returned by # [SendMessageCommand].
       - name: MessageAddedEvent
         extends: BackgroundEvent
         implements:
@@ -109,7 +110,7 @@ files:
           - JsonImplementation
         attributes:
           id: int
-          progress: double
+          progress: double?
       # Triggered by [RosterService] if we receive a roster push.
       - name: RosterDiffEvent
         extends: BackgroundEvent
@@ -172,6 +173,32 @@ files:
         extends: BackgroundEvent
         implements:
           - JsonImplementation
+      - name: GetConversationOmemoFingerprintsResult
+        extends: BackgroundEvent
+        implements:
+          - JsonImplementation
+        attributes:
+          fingerprints:
+            type: List<OmemoDevice>
+            deserialise: true
+      - name: GetOwnOmemoFingerprintsResult
+        extends: BackgroundEvent
+        implements:
+          - JsonImplementation
+        attributes:
+          ownDeviceFingerprint: String
+          ownDeviceId: int
+          fingerprints:
+            type: List<OmemoDevice>
+            deserialise: true
+      - name: RegenerateOwnDeviceResult
+        extends: BackgroundEvent
+        implements:
+          - JsonImplementation
+        attributes:
+          device:
+            type: OmemoDevice
+            deserialise: true
     generate_builder: true
     builder_name: "Event"
     builder_baseclass: "BackgroundEvent"
@@ -190,6 +217,8 @@ files:
         extends: BackgroundCommand
         implements:
           - JsonImplementation
+        attributes:
+          systemLocaleCode: String
       - name: AddConversationCommand
         extends: BackgroundCommand
         implements:
@@ -315,6 +344,56 @@ files:
         attributes:
           jid: String
           muted: bool
+      - name: GetConversationOmemoFingerprintsCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+          jid: String
+      - name: SetOmemoDeviceEnabledCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+          jid: String
+          deviceId: int
+          enabled: bool
+      - name: RecreateSessionsCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+          jid: String
+      - name: SetOmemoEnabledCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+          jid: String
+          enabled: bool
+      - name: GetOwnOmemoFingerprintsCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+      - name: RemoveOwnDeviceCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+          deviceId: int
+      - name: RegenerateOwnDeviceCommand
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+      - name: RetractMessageComment
+        extends: BackgroundCommand
+        implements:
+          - JsonImplementation
+        attributes:
+          originId: String
+          conversationJid: String
     generate_builder: true
     # get${builder_Name}FromJson
     builder_name: "Command"

lib/main.dart

@@ -1,10 +1,12 @@
 import 'dart:async';
-
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
 import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/service/service.dart';
 import 'package:moxxyv2/shared/commands.dart';
 import 'package:moxxyv2/ui/bloc/addcontact_bloc.dart';
@@ -13,9 +15,11 @@ import 'package:moxxyv2/ui/bloc/conversation_bloc.dart';
 import 'package:moxxyv2/ui/bloc/conversations_bloc.dart';
 import 'package:moxxyv2/ui/bloc/crop_bloc.dart';
 import 'package:moxxyv2/ui/bloc/cropbackground_bloc.dart';
+import 'package:moxxyv2/ui/bloc/devices_bloc.dart';
 import 'package:moxxyv2/ui/bloc/login_bloc.dart';
 import 'package:moxxyv2/ui/bloc/navigation_bloc.dart';
 import 'package:moxxyv2/ui/bloc/newconversation_bloc.dart';
+import 'package:moxxyv2/ui/bloc/own_devices_bloc.dart';
 import 'package:moxxyv2/ui/bloc/preferences_bloc.dart';
 import 'package:moxxyv2/ui/bloc/profile_bloc.dart';
 import 'package:moxxyv2/ui/bloc/sendfiles_bloc.dart';
@@ -36,10 +40,13 @@ import 'package:moxxyv2/ui/pages/crop.dart';
 import 'package:moxxyv2/ui/pages/intro.dart';
 import 'package:moxxyv2/ui/pages/login.dart';
 import 'package:moxxyv2/ui/pages/newconversation.dart';
+import 'package:moxxyv2/ui/pages/profile/devices.dart';
+import 'package:moxxyv2/ui/pages/profile/own_devices.dart';
 import 'package:moxxyv2/ui/pages/profile/profile.dart';
 import 'package:moxxyv2/ui/pages/sendfiles.dart';
 import 'package:moxxyv2/ui/pages/server_info.dart';
 import 'package:moxxyv2/ui/pages/settings/about.dart';
+import 'package:moxxyv2/ui/pages/settings/appearance/appearance.dart';
 import 'package:moxxyv2/ui/pages/settings/appearance/cropbackground.dart';
 import 'package:moxxyv2/ui/pages/settings/conversation.dart';
 import 'package:moxxyv2/ui/pages/settings/debugging.dart';
@@ -52,12 +59,12 @@ import 'package:moxxyv2/ui/pages/sharedmedia.dart';
 import 'package:moxxyv2/ui/pages/splashscreen/splashscreen.dart';
 import 'package:moxxyv2/ui/service/data.dart';
 import 'package:moxxyv2/ui/service/progress.dart';
-import 'package:moxxyv2/ui/service/thumbnail.dart';
+import 'package:moxxyv2/ui/theme.dart';
 import 'package:page_transition/page_transition.dart';
 import 'package:share_handler/share_handler.dart';
 
 void setupLogging() {
-  Logger.root.level = Level.ALL;
+  Logger.root.level = kDebugMode ? Level.ALL : Level.INFO;
   Logger.root.onRecord.listen((record) {
     // ignore: avoid_print
     print('[${record.level.name}] (${record.loggerName}) ${record.time}: ${record.message}');
@@ -68,7 +75,6 @@ void setupLogging() {
 Future<void> setupUIServices() async {
   GetIt.I.registerSingleton<UIProgressService>(UIProgressService());
   GetIt.I.registerSingleton<UIDataService>(UIDataService());
-  GetIt.I.registerSingleton<ThumbnailCacheService>(ThumbnailCacheService());
 }
 
 void setupBlocs(GlobalKey<NavigatorState> navKey) {
@@ -76,8 +82,7 @@ void setupBlocs(GlobalKey<NavigatorState> navKey) {
   GetIt.I.registerSingleton<ConversationsBloc>(ConversationsBloc());
   GetIt.I.registerSingleton<NewConversationBloc>(NewConversationBloc());
   GetIt.I.registerSingleton<ConversationBloc>(ConversationBloc());
-  GetIt.I.registerSingleton<BlocklistBloc>(BlocklistBloc());
-  GetIt.I.registerSingleton<ProfileBloc>(ProfileBloc());
+  GetIt.I.registerSingleton<BlocklistBloc>(BlocklistBloc()); GetIt.I.registerSingleton<ProfileBloc>(ProfileBloc());
   GetIt.I.registerSingleton<PreferencesBloc>(PreferencesBloc());
   GetIt.I.registerSingleton<AddContactBloc>(AddContactBloc());
   GetIt.I.registerSingleton<SharedMediaBloc>(SharedMediaBloc());
@@ -86,6 +91,8 @@ void setupBlocs(GlobalKey<NavigatorState> navKey) {
   GetIt.I.registerSingleton<CropBackgroundBloc>(CropBackgroundBloc());
   GetIt.I.registerSingleton<ShareSelectionBloc>(ShareSelectionBloc());
   GetIt.I.registerSingleton<ServerInfoBloc>(ServerInfoBloc());
+  GetIt.I.registerSingleton<DevicesBloc>(DevicesBloc());
+  GetIt.I.registerSingleton<OwnDevicesBloc>(OwnDevicesBloc());
 }
 
 // TODO(Unknown): Replace all Column(children: [ Padding(), Padding, ...]) with a
@@ -103,7 +110,7 @@ void main() async {
   setupBlocs(navKey);
 
   await initializeServiceIfNeeded();
-    
+ 
   runApp(
     MultiBlocProvider(
       providers: [
@@ -152,15 +159,23 @@ void main() async {
         BlocProvider<ServerInfoBloc>(
           create: (_) => GetIt.I.get<ServerInfoBloc>(),
         ),
+        BlocProvider<DevicesBloc>(
+          create: (_) => GetIt.I.get<DevicesBloc>(),
+        ),
+        BlocProvider<OwnDevicesBloc>(
+          create: (_) => GetIt.I.get<OwnDevicesBloc>(),
+        ),
       ],
-      child: MyApp(navKey),
+      child: TranslationProvider(
+        child: MyApp(navKey),
+      ),
     ),
   );
 }
 
 class MyApp extends StatefulWidget {
 
-  const MyApp(this.navigationKey, { Key? key }) : super(key: key);
+  const MyApp(this.navigationKey, { super.key });
   final GlobalKey<NavigatorState> navigationKey;
 
   @override
@@ -248,44 +263,12 @@ class MyAppState extends State<MyApp> with WidgetsBindingObserver {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      locale: TranslationProvider.of(context).flutterLocale,
+      supportedLocales: LocaleSettings.supportedLocales,
+      localizationsDelegates: GlobalMaterialLocalizations.delegates,
       title: 'Moxxy',
-      theme: ThemeData(
-        elevatedButtonTheme: ElevatedButtonThemeData(
-          style: ElevatedButton.styleFrom(
-            primary: primaryColor,
-            onPrimary: Colors.white,
-          ),
-        ),
-        textButtonTheme: TextButtonThemeData(
-          style: TextButton.styleFrom(
-            primary: primaryColor,
-          ),
-        ),
-        // NOTE: Mainly for the SettingsSection
-        colorScheme: const ColorScheme.light(
-          secondary: primaryColor,
-        ),
-      ),
-      darkTheme: ThemeData(
-        brightness: Brightness.dark,
-        elevatedButtonTheme: ElevatedButtonThemeData(
-          style: ElevatedButton.styleFrom(
-            primary: primaryColor,
-            onPrimary: Colors.white,
-          ),
-        ),
-        textButtonTheme: TextButtonThemeData(
-          style: TextButton.styleFrom(
-            primary: primaryColor,
-          ),
-        ),
-        // NOTE: Mainly for the SettingsSection
-        colorScheme: const ColorScheme.dark(
-          secondary: primaryColor,
-        ),
-
-        backgroundColor: const Color(0xff303030),
-      ),
+      theme: getThemeData(context, Brightness.light),
+      darkTheme: getThemeData(context, Brightness.dark),
       navigatorKey: widget.navigationKey,
       onGenerateRoute: (settings) {
         switch (settings.name) {
@@ -314,6 +297,9 @@ class MyAppState extends State<MyApp> with WidgetsBindingObserver {
           case shareSelectionRoute: return ShareSelectionPage.route;
           case serverInfoRoute: return ServerInfoPage.route;
           case conversationSettingsRoute: return ConversationSettingsPage.route;
+          case devicesRoute: return DevicesPage.route;
+          case ownDevicesRoute: return OwnDevicesPage.route;
+          case appearanceRoute: return AppearanceSettingsPage.route;
         }
 
         return null;

lib/service/avatars.dart

@@ -5,6 +5,8 @@ import 'package:get_it/get_it.dart';
 import 'package:hex/hex.dart';
 import 'package:image_size_getter/image_size_getter.dart';
 import 'package:logging/logging.dart';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/conversation.dart';
 import 'package:moxxyv2/service/preferences.dart';
 import 'package:moxxyv2/service/roster.dart';
@@ -12,14 +14,6 @@ import 'package:moxxyv2/service/service.dart';
 import 'package:moxxyv2/service/xmpp.dart';
 import 'package:moxxyv2/shared/avatar.dart';
 import 'package:moxxyv2/shared/events.dart';
-import 'package:moxxyv2/shared/helpers.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/namespaces.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0030/helpers.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0030/xep_0030.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0054.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0084.dart';
 
 /// Removes line breaks and spaces from [original]. This might happen when we request the
 /// avatar data. Returns the cleaned version.
@@ -93,7 +87,10 @@ class AvatarService {
   }
   
   Future<void> fetchAndUpdateAvatarForJid(String jid, String oldHash) async {
-    final items = (await _getDiscoManager().discoItemsQuery(jid)) ?? [];
+    final response = await _getDiscoManager().discoItemsQuery(jid);
+    final items = response.isType<DiscoError>() ?
+      <DiscoItem>[] :
+      response.get<List<DiscoItem>>();
     final itemNodes = items.map((i) => i.node);
 
     _log.finest('Disco items for $jid:');

lib/service/blocking.dart

@@ -1,9 +1,7 @@
 import 'package:get_it/get_it.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/service.dart';
 import 'package:moxxyv2/shared/events.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0191.dart';
 
 enum BlockPushType {
   block,

lib/service/connectivity.dart

@@ -1,15 +1,13 @@
 import 'dart:io' show Platform;
-
 import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
 import 'package:meta/meta.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/httpfiletransfer/httpfiletransfer.dart';
 import 'package:moxxyv2/service/moxxmpp/reconnect.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
 
 class ConnectivityService {
-
   ConnectivityService() : _log = Logger('ConnectivityService');
   final Logger _log;
 

lib/service/connectivity_watcher.dart

@@ -2,9 +2,10 @@ import 'dart:async';
 import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/service/connectivity.dart';
 import 'package:moxxyv2/service/notifications.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
 
 class ConnectivityWatcherService {
 
@@ -17,7 +18,7 @@ class ConnectivityWatcherService {
   Future<void> _onTimerElapsed() async {
     await GetIt.I.get<NotificationsService>().showWarningNotification(
       'Moxxy',
-      'Could not connect to server',
+      t.errors.connection.connectionTimeout,
     );
     _stopTimer();
   }

lib/service/conversation.dart

@@ -1,12 +1,12 @@
 import 'package:get_it/get_it.dart';
+import 'package:moxlib/moxlib.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/database/database.dart';
+import 'package:moxxyv2/service/preferences.dart';
 import 'package:moxxyv2/shared/cache.dart';
-import 'package:moxxyv2/shared/helpers.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 
 class ConversationService {
-
   ConversationService()
     : _conversationCache = LRUCache(100),
       _loadedConversations = false;
@@ -55,25 +55,30 @@ class ConversationService {
   
   /// Wrapper around [DatabaseService]'s [updateConversation] that modifies the cache.
   Future<Conversation> updateConversation(int id, {
-      String? lastMessageBody,
-      int? lastChangeTimestamp,
-      bool? open,
-      int? unreadCounter,
-      String? avatarUrl,
-      ChatState? chatState,
-      bool? muted,
-    }
-  ) async {
+    String? lastMessageBody,
+    int? lastChangeTimestamp,
+    bool? lastMessageRetracted,
+    int? lastMessageId,
+    bool? open,
+    int? unreadCounter,
+    String? avatarUrl,
+    ChatState? chatState,
+    bool? muted,
+    bool? encrypted,
+  }) async {
     final conversation = await _getConversationById(id);
     final newConversation = await GetIt.I.get<DatabaseService>().updateConversation(
       id,
       lastMessageBody: lastMessageBody,
+      lastMessageRetracted: lastMessageRetracted,
+      lastMessageId: lastMessageId,
       lastChangeTimestamp: lastChangeTimestamp,
       open: open,
       unreadCounter: unreadCounter,
       avatarUrl: avatarUrl,
       chatState: conversation?.chatState ?? ChatState.gone,
       muted: muted,
+      encrypted: encrypted,
     );
 
     _conversationCache.cache(id, newConversation);
@@ -83,6 +88,8 @@ class ConversationService {
   /// Wrapper around [DatabaseService]'s [addConversationFromData] that updates the cache.
   Future<Conversation> addConversationFromData(
     String title,
+    int lastMessageId,
+    bool lastMessageRetracted,
     String lastMessageBody,
     String avatarUrl,
     String jid,
@@ -90,9 +97,12 @@ class ConversationService {
     int lastChangeTimestamp,
     bool open,
     bool muted,
+    bool encrypted,
   ) async {
     final newConversation = await GetIt.I.get<DatabaseService>().addConversationFromData(
       title,
+      lastMessageId,
+      lastMessageRetracted,
       lastMessageBody,
       avatarUrl,
       jid,
@@ -100,9 +110,21 @@ class ConversationService {
       lastChangeTimestamp,
       open,
       muted,
+      encrypted,
     );
 
     _conversationCache.cache(newConversation.id, newConversation);
     return newConversation;
   }
+
+  /// Returns true if the stanzas to the conversation with [jid] should be encrypted.
+  /// If not, returns false.
+  ///
+  /// If the conversation does not exist, then the value of the preference for
+  /// enableOmemoByDefault is used.
+  Future<bool> shouldEncryptForConversation(JID jid) async {
+    final prefs = await GetIt.I.get<PreferencesService>().getPreferences();
+    final conversation = await getConversationByJid(jid.toString());
+    return conversation?.encrypted ?? prefs.enableOmemoByDefault;
+  }
 }

lib/service/cryptography/cryptography.dart

@@ -0,0 +1,138 @@
+import 'dart:convert';
+import 'dart:math';
+import 'dart:typed_data';
+import 'package:logging/logging.dart';
+import 'package:moxplatform/moxplatform.dart';
+import 'package:moxplatform_platform_interface/moxplatform_platform_interface.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/service/cryptography/types.dart';
+
+List<int> _randomBuffer(int length) {
+  final buf = List<int>.empty(growable: true);
+
+  final random = Random.secure();
+  for (var i = 0; i < length; i++) {
+    buf.add(random.nextInt(256));
+  }
+
+  return buf;
+}
+
+CipherAlgorithm _sfsToCipher(SFSEncryptionType type) {
+  switch (type) {
+    case SFSEncryptionType.aes128GcmNoPadding: return CipherAlgorithm.aes128GcmNoPadding;
+    case SFSEncryptionType.aes256GcmNoPadding: return CipherAlgorithm.aes256GcmNoPadding;
+    case SFSEncryptionType.aes256CbcPkcs7: return CipherAlgorithm.aes256CbcPkcs7;
+  }
+}
+
+class CryptographyService {
+
+  CryptographyService() : _log = Logger('CryptographyService');
+  final Logger _log;
+
+  /// Encrypt the file at path [source] and write the encrypted data to [dest]. For the
+  /// encryption, use the algorithm indicated by [encryption].
+  Future<EncryptionResult> encryptFile(String source, String dest, SFSEncryptionType encryption) async {
+    _log.finest('Beginning encryption routine for $source');
+    final key = encryption == SFSEncryptionType.aes128GcmNoPadding ?
+      _randomBuffer(16) :
+      _randomBuffer(32);
+    final iv = _randomBuffer(12);
+    final result = (await MoxplatformPlugin.crypto.encryptFile(
+      source,
+      dest,
+      Uint8List.fromList(key),
+      Uint8List.fromList(iv),
+      _sfsToCipher(encryption),
+      'SHA-256',
+    ))!;
+    _log.finest('Encryption done for $source ($result)');
+
+    return EncryptionResult(
+      key,
+      iv,
+      <String, String>{
+        hashSha256: base64Encode(result.plaintextHash),
+      },
+      <String, String>{
+        hashSha256: base64Encode(result.ciphertextHash),
+      },
+    );
+  }
+
+  /// Decrypt the file at [source] and write the decrypted version to [dest]. For the
+  /// decryption, use the algorithm indicated by [encryption] with the key [key] and the
+  /// IV or nonce [iv].
+  Future<DecryptionResult> decryptFile(
+    String source,
+    String dest,
+    SFSEncryptionType encryption,
+    List<int> key,
+    List<int> iv,
+    Map<String, String> plaintextHashes,
+    Map<String, String> ciphertextHashes,
+  ) async {
+    _log.finest('Beginning decryption for $source');
+    final result = await MoxplatformPlugin.crypto.encryptFile(
+      source,
+      dest,
+      Uint8List.fromList(key),
+      Uint8List.fromList(iv),
+      _sfsToCipher(encryption),
+      // TODO(Unknown): How to we get hash agility here?
+      'SHA-256',
+    );
+    _log.finest('Decryption done for $source (${result != null})');
+
+    var passedPlaintextIntegrityCheck = true;
+    var passedCiphertextIntegrityCheck = true;
+    for (final entry in plaintextHashes.entries) {
+      if (entry.key == hashSha256) {
+        if (base64Encode(result!.plaintextHash) != entry.value) {
+          passedPlaintextIntegrityCheck = false;
+        } else {
+          passedPlaintextIntegrityCheck = true;
+        }
+
+        break;
+      }
+    }
+     for (final entry in ciphertextHashes.entries) {
+      if (entry.key == hashSha256) {
+        if (base64Encode(result!.ciphertextHash) != entry.value) {
+          passedCiphertextIntegrityCheck = false;
+        } else {
+          passedCiphertextIntegrityCheck = true;
+        }
+
+        break;
+      }
+    }
+
+    return DecryptionResult(
+      result != null,
+      passedPlaintextIntegrityCheck,
+      passedCiphertextIntegrityCheck,
+    );
+  }
+
+  /// Read the file at [path] and calculate the base64-encoded hash using the algorithm
+  /// indicated by [hash].
+  Future<String> hashFile(String path, HashFunction hash) async {
+    String hashSpec;
+    if (hash == HashFunction.sha256) {
+      hashSpec = 'SHA-256';
+    } else if (hash == HashFunction.sha512) {
+      hashSpec = 'SHA-512';
+    } else {
+      // Android itself does not provide more
+      throw Exception();
+    }
+    
+    _log.finest('Beginning hash generation of $path');
+    final data = await MoxplatformPlugin.crypto.hashFile(path, hashSpec);
+    _log.finest('Hash generation done for $path');
+    return base64Encode(data!);
+  }
+}

lib/service/cryptography/implementations.dart

@@ -0,0 +1,150 @@
+import 'dart:convert';
+import 'dart:io';
+import 'package:cryptography/cryptography.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/service/cryptography/types.dart';
+
+Future<List<int>> hashFileImpl(HashRequest request) async {
+  final data = await File(request.path).readAsBytes();
+
+  return CryptographicHashManager.hashFromData(data, request.hash);
+}
+
+Future<EncryptionResult> encryptFileImpl(EncryptionRequest request) async { 
+  Cipher algorithm;
+  switch (request.encryption) {
+    case SFSEncryptionType.aes128GcmNoPadding:
+      algorithm = AesGcm.with128bits();
+      break;
+    case SFSEncryptionType.aes256GcmNoPadding:
+      algorithm = AesGcm.with256bits();
+      break;
+    case SFSEncryptionType.aes256CbcPkcs7:
+      // TODO(Unknown): Implement
+      throw Exception();
+      // ignore: dead_code
+      break;
+  }
+
+  // Generate a key and an IV for the file
+  final key = await algorithm.newSecretKey();
+  final iv = algorithm.newNonce();
+  final plaintext = await File(request.source).readAsBytes();
+  final secretBox = await algorithm.encrypt(
+    plaintext,
+    secretKey: key,
+    nonce: iv,
+  );
+  final ciphertext = [
+    ...secretBox.cipherText,
+    ...secretBox.mac.bytes,
+  ];
+
+  // Write the file
+  await File(request.dest).writeAsBytes(ciphertext);
+
+  return EncryptionResult(
+    await key.extractBytes(),
+    iv,
+    {
+      hashSha256: base64Encode(
+        await CryptographicHashManager.hashFromData(plaintext, HashFunction.sha256),
+      ),
+    },
+    {
+      hashSha256: base64Encode(
+        await CryptographicHashManager.hashFromData(ciphertext, HashFunction.sha256),
+      ),
+    },
+  );
+}
+
+// TODO(PapaTutuWawa): Somehow fail when the ciphertext hash is not matching the provided data
+Future<DecryptionResult> decryptFileImpl(DecryptionRequest request) async {
+  Cipher algorithm;
+  switch (request.encryption) {
+    case SFSEncryptionType.aes128GcmNoPadding:
+      algorithm = AesGcm.with128bits();
+      break;
+    case SFSEncryptionType.aes256GcmNoPadding:
+      algorithm = AesGcm.with256bits();
+      break;
+    case SFSEncryptionType.aes256CbcPkcs7:
+      // TODO(Unknown): Implement
+      throw Exception();
+      // ignore: dead_code
+      break;
+  }
+  
+  final ciphertextRaw = await File(request.source).readAsBytes();
+  final mac = List<int>.empty(growable: true);
+  final ciphertext = List<int>.empty(growable: true);
+  // TODO(PapaTutuWawa): Somehow handle aes256CbcPkcs7
+  if (request.encryption == SFSEncryptionType.aes128GcmNoPadding ||
+      request.encryption == SFSEncryptionType.aes256GcmNoPadding) {
+    mac.addAll(ciphertextRaw.sublist(ciphertextRaw.length - 16));
+    ciphertext.addAll(ciphertextRaw.sublist(0, ciphertextRaw.length - 16));
+  }
+
+  var passedCiphertextIntegrityCheck = true;
+  var passedPlaintextIntegrityCheck = true;
+  // Try to find one hash we can verify
+  for (final entry in request.ciphertextHashes.entries) {
+    if ([hashSha256, hashSha512, hashBlake2b512].contains(entry.key)) {
+      final hash = await CryptographicHashManager.hashFromData(
+        ciphertext,
+        hashFunctionFromName(entry.key),
+      );
+
+      if (base64Encode(hash) == entry.value) {
+        passedCiphertextIntegrityCheck = true;
+      } else {
+        passedCiphertextIntegrityCheck = false;
+      }
+      break;
+    }
+  }
+  
+  final secretBox = SecretBox(
+    ciphertext,
+    nonce: request.iv,
+    mac: Mac(mac),
+  );
+
+  try {
+    final data = await algorithm.decrypt(
+      secretBox,
+      secretKey: SecretKey(request.key),
+    );
+
+    for (final entry in request.plaintextHashes.entries) {
+      if ([hashSha256, hashSha512, hashBlake2b512].contains(entry.key)) {
+        final hash = await CryptographicHashManager.hashFromData(
+          data,
+          hashFunctionFromName(entry.key),
+        );
+
+        if (base64Encode(hash) == entry.value) {
+          passedPlaintextIntegrityCheck = true;
+        } else {
+          passedPlaintextIntegrityCheck = false;
+        }
+        break;
+      }
+    }
+
+    await File(request.dest).writeAsBytes(data);
+  } catch (_) {
+    return DecryptionResult(
+      false,
+      passedPlaintextIntegrityCheck,
+      passedCiphertextIntegrityCheck,
+    );
+  }
+
+  return DecryptionResult(
+    true,
+    passedPlaintextIntegrityCheck,
+    passedCiphertextIntegrityCheck,
+  );
+}

lib/service/cryptography/types.dart

@@ -0,0 +1,64 @@
+import 'package:meta/meta.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+
+@immutable
+class EncryptionResult {
+
+  const EncryptionResult(this.key, this.iv, this.plaintextHashes, this.ciphertextHashes);
+  final List<int> key;
+  final List<int> iv;
+
+  final Map<String, String> plaintextHashes;
+  final Map<String, String> ciphertextHashes;
+}
+
+@immutable
+class EncryptionRequest {
+
+  const EncryptionRequest(this.source, this.dest, this.encryption);
+  final String source;
+  final String dest;
+  final SFSEncryptionType encryption;
+}
+
+@immutable
+class DecryptionResult {
+
+  const DecryptionResult(
+    this.decryptionOkay,
+    this.plaintextOkay,
+    this.ciphertextOkay,
+  );
+  final bool decryptionOkay;
+  final bool plaintextOkay;
+  final bool ciphertextOkay;
+}
+
+@immutable
+class DecryptionRequest {
+
+  const DecryptionRequest(
+    this.source,
+    this.dest,
+    this.encryption,
+    this.key,
+    this.iv,
+    this.plaintextHashes,
+    this.ciphertextHashes,
+  );
+  final String source;
+  final String dest;
+  final SFSEncryptionType encryption;
+  final List<int> key;
+  final List<int> iv;
+  final Map<String, String> plaintextHashes;
+  final Map<String, String> ciphertextHashes;
+}
+
+@immutable
+class HashRequest {
+
+  const HashRequest(this.path, this.hash);
+  final String path;
+  final HashFunction hash;
+}

lib/service/database/constants.dart

@@ -3,6 +3,13 @@ const messsagesTable = 'Messages';
 const rosterTable = 'RosterItems';
 const mediaTable = 'SharedMedia';
 const preferenceTable = 'Preferences';
+const omemoDeviceTable = 'OmemoDevices';
+const omemoDeviceListTable = 'OmemoDeviceList';
+const omemoRatchetsTable = 'OmemoSessions';
+const omemoTrustCacheTable = 'OmemoTrustCacheList';
+const omemoTrustDeviceListTable = 'OmemoTrustDeviceList';
+const omemoTrustEnableListTable = 'OmemoTrustEnableList';
+const xmppStateTable = 'XmppState';
 
 const typeString = 0;
 const typeInt = 1;

lib/service/database/creation.dart

@@ -7,6 +7,15 @@ Future<void> configureDatabase(Database db) async {
 }
 
 Future<void> createDatabase(Database db, int version) async {
+  // XMPP state
+  await db.execute(
+    '''
+    CREATE TABLE $xmppStateTable (
+      key   TEXT PRIMARY KEY,
+      value TEXT
+    )''',
+  );
+
   // Messages
   await db.execute(
     '''
@@ -19,19 +28,30 @@ Future<void> createDatabase(Database db, int version) async {
       conversationJid TEXT NOT NULL,
       isMedia INTEGER NOT NULL,
       isFileUploadNotification INTEGER NOT NULL,
+      encrypted INTEGER NOT NULL,
       errorType INTEGER,
+      warningType INTEGER,
       mediaUrl TEXT,
       mediaType TEXT,
       thumbnailData TEXT,
       mediaWidth INTEGER,
       mediaHeight INTEGER,
       srcUrl TEXT,
+      key TEXT,
+      iv TEXT,
+      encryptionScheme TEXT,
       received INTEGER,
       displayed INTEGER,
       acked INTEGER,
       originId TEXT,
       quote_id INTEGER,
       filename TEXT,
+      plaintextHashes TEXT,
+      ciphertextHashes TEXT,
+      isDownloading INTEGER NOT NULL,
+      isUploading INTEGER NOT NULL,
+      mediaSize INTEGER,
+      isRetracted INTEGER,
       CONSTRAINT fk_quote FOREIGN KEY (quote_id) REFERENCES $messsagesTable (id)
     )''',
   );
@@ -48,7 +68,10 @@ Future<void> createDatabase(Database db, int version) async {
       unreadCounter INTEGER NOT NULL,
       lastMessageBody TEXT NOT NULL,
       open INTEGER NOT NULL,
-      muted INTEGER NOT NULL
+      muted INTEGER NOT NULL,
+      encrypted INTEGER NOT NULL,
+      lastMessageId INTEGER NOT NULL,
+      lastMessageRetracted INTEGER NOT NULL,
     )''',
   );
 
@@ -79,6 +102,69 @@ Future<void> createDatabase(Database db, int version) async {
     )''',
   );
 
+  // OMEMO
+  await db.execute(
+    '''
+    CREATE TABLE $omemoRatchetsTable (
+      id         INTEGER NOT NULL,
+      jid        TEXT NOT NULL,
+      dhs        TEXT NOT NULL,
+      dhs_pub    TEXT NOT NULL,
+      dhr        TEXT,
+      rk         TEXT NOT NULL,
+      cks        TEXT,
+      ckr        TEXT,
+      ns         INTEGER NOT NULL,
+      nr         INTEGER NOT NULL,
+      pn         INTEGER NOT NULL,
+      ik_pub     TEXT NOT NULL,
+      session_ad TEXT NOT NULL,
+      acknowledged INTEGER NOT NULL,
+      mkskipped  TEXT NOT NULL,
+      kex_timestamp INTEGER NOT NULL,
+      kex        TEXT,
+      PRIMARY KEY (jid, id)
+    )''',
+  );
+  await db.execute(
+    '''
+    CREATE TABLE $omemoTrustCacheTable (
+      key   TEXT PRIMARY KEY NOT NULL,
+      trust INTEGER NOT NULL
+    )''',
+  );
+  await db.execute(
+    '''
+    CREATE TABLE $omemoTrustDeviceListTable (
+      jid    TEXT NOT NULL,
+      device INTEGER NOT NULL
+    )''',
+  );
+  await db.execute(
+    '''
+    CREATE TABLE $omemoTrustEnableListTable (
+      key     TEXT PRIMARY KEY NOT NULL,
+      enabled INTEGER NOT NULL
+    )''',
+  );
+  await db.execute(
+    '''
+    CREATE TABLE $omemoDeviceTable (
+      jid  TEXT NOT NULL,
+      id   INTEGER NOT NULL,
+      data TEXT NOT NULL,
+      PRIMARY KEY (jid, id)
+    )''',
+  );
+   await db.execute(
+    '''
+    CREATE TABLE $omemoDeviceListTable (
+      jid  TEXT NOT NULL,
+      id   INTEGER NOT NULL,
+      PRIMARY KEY (jid, id)
+    )''',
+  );
+
   // Settings
   await db.execute(
     '''
@@ -86,8 +172,7 @@ Future<void> createDatabase(Database db, int version) async {
       key TEXT NOT NULL PRIMARY KEY,
       type INTEGER NOT NULL,
       value TEXT NOT NULL
-    );
-    ''',
+    )''',
   );
   await db.insert(
     preferenceTable,
@@ -233,4 +318,20 @@ Future<void> createDatabase(Database db, int version) async {
       'false',
     ).toDatabaseJson(),
   );
+  await db.insert(
+    preferenceTable,
+    Preference(
+      'enableOmemoByDefault',
+      typeBool,
+      'false',
+    ).toDatabaseJson(),
+  );
+  await db.insert(
+    preferenceTable,
+    Preference(
+      'languageLocaleCode',
+      typeString,
+      'default',
+    ).toDatabaseJson(),
+  );
 }

lib/service/database/database.dart

@@ -1,19 +1,27 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:math';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/database/constants.dart';
 import 'package:moxxyv2/service/database/creation.dart';
 import 'package:moxxyv2/service/database/helpers.dart';
+import 'package:moxxyv2/service/database/migrations/0000_language.dart';
+import 'package:moxxyv2/service/database/migrations/0000_retraction.dart';
+import 'package:moxxyv2/service/database/migrations/0000_retraction_conversation.dart';
+import 'package:moxxyv2/service/database/migrations/0000_xmpp_state.dart';
+import 'package:moxxyv2/service/not_specified.dart';
+import 'package:moxxyv2/service/omemo/omemo.dart';
 import 'package:moxxyv2/service/roster.dart';
-import 'package:moxxyv2/shared/error_types.dart';
+import 'package:moxxyv2/service/state.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/shared/models/media.dart';
 import 'package:moxxyv2/shared/models/message.dart';
 import 'package:moxxyv2/shared/models/preferences.dart';
 import 'package:moxxyv2/shared/models/roster.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
+import 'package:omemo_dart/omemo_dart.dart';
 import 'package:path/path.dart' as path;
 import 'package:random_string/random_string.dart';
 import 'package:sqflite_sqlcipher/sqflite.dart';
@@ -21,7 +29,6 @@ import 'package:sqflite_sqlcipher/sqflite.dart';
 const databasePasswordKey = 'database_encryption_password';
 
 class DatabaseService {
-  
   DatabaseService() : _log = Logger('DatabaseService');
   late Database _db;
   final FlutterSecureStorage _storage = const FlutterSecureStorage(
@@ -50,9 +57,27 @@ class DatabaseService {
     _db = await openDatabase(
       dbPath,
       password: key,
-      version: 1,
+      version: 5,
       onCreate: createDatabase,
       onConfigure: configureDatabase,
+      onUpgrade: (db, oldVersion, newVersion) async {
+        if (oldVersion < 2) {
+          _log.finest('Running migration for database version 2');
+          await upgradeFromV1ToV2(db);
+        }
+        if (oldVersion < 3) {
+          _log.finest('Running migration for database version 3');
+          await upgradeFromV2ToV3(db);
+        }
+        if (oldVersion < 4) {
+          _log.finest('Running migration for database version 4');
+          await upgradeFromV3ToV4(db);
+        }
+        if (oldVersion < 5) {
+          _log.finest('Running migration for database version 5');
+          await upgradeFromV4ToV5(db);
+        }
+      },
     );
 
     _log.finest('Database setup done');
@@ -108,7 +133,7 @@ class DatabaseService {
         final rawQuote = (await _db.query(
           'Messages',
           where: 'conversationJid = ? AND id = ?',
-          whereArgs: [jid, m['id']! as int],
+          whereArgs: [jid, m['quote_id']! as int],
         )).first;
         quotes = Message.fromDatabaseJson(rawQuote, null);
       }
@@ -121,15 +146,17 @@ class DatabaseService {
   
   /// Updates the conversation with id [id] inside the database.
   Future<Conversation> updateConversation(int id, {
-      String? lastMessageBody,
-      int? lastChangeTimestamp,
-      bool? open,
-      int? unreadCounter,
-      String? avatarUrl,
-      ChatState? chatState,
-      bool? muted,
-    }
-  ) async {
+    String? lastMessageBody,
+    int? lastChangeTimestamp,
+    bool? lastMessageRetracted,
+    int? lastMessageId,
+    bool? open,
+    int? unreadCounter,
+    String? avatarUrl,
+    ChatState? chatState,
+    bool? muted,
+    bool? encrypted,
+  }) async {
     final cd = (await _db.query(
       'Conversations',
       where: 'id = ?',
@@ -148,6 +175,12 @@ class DatabaseService {
     if (lastMessageBody != null) {
       c['lastMessageBody'] = lastMessageBody;
     }
+    if (lastMessageRetracted != null) {
+      c['lastMessageRetracted'] = boolToInt(lastMessageRetracted);
+    }
+    if (lastMessageId != null) {
+      c['lastMessageId'] = lastMessageId;
+    }
     if (lastChangeTimestamp != null) {
       c['lastChangeTimestamp'] = lastChangeTimestamp;
     }
@@ -163,6 +196,9 @@ class DatabaseService {
     if (muted != null) {
       c['muted'] = boolToInt(muted);
     }
+    if (encrypted != null) {
+      c['encrypted'] = boolToInt(encrypted);
+    }
 
     await _db.update(
       'Conversations',
@@ -184,6 +220,8 @@ class DatabaseService {
   /// [Conversation] object can carry its database id.
   Future<Conversation> addConversationFromData(
     String title,
+    int lastMessageId,
+    bool lastMessageRetracted,
     String lastMessageBody,
     String avatarUrl,
     String jid,
@@ -191,10 +229,13 @@ class DatabaseService {
     int lastChangeTimestamp,
     bool open,
     bool muted,
+    bool encrypted,
   ) async {
     final rosterItem = await GetIt.I.get<RosterService>().getRosterItemByJid(jid);
     final conversation = Conversation(
       title,
+      lastMessageId,
+      lastMessageRetracted,
       lastMessageBody,
       avatarUrl,
       jid,
@@ -206,6 +247,7 @@ class DatabaseService {
       rosterItem != null,
       rosterItem?.subscription ?? 'none',
       muted,
+      encrypted,
       ChatState.gone,
     );
 
@@ -237,8 +279,12 @@ class DatabaseService {
     bool isMedia,
     String sid,
     bool isFileUploadNotification,
+    bool encrypted,
     {
       String? srcUrl,
+      String? key,
+      String? iv,
+      String? encryptionScheme,
       String? mediaUrl,
       String? mediaType,
       String? thumbnailData,
@@ -247,9 +293,16 @@ class DatabaseService {
       String? originId,
       String? quoteId,
       String? filename,
+      int? errorType,
+      int? warningType,
+      Map<String, String>? plaintextHashes,
+      Map<String, String>? ciphertextHashes,
+      bool isDownloading = false,
+      bool isUploading = false,
+      int? mediaSize,
     }
   ) async {
-    final m = Message(
+    var m = Message(
       sender,
       body,
       timestamp,
@@ -258,8 +311,13 @@ class DatabaseService {
       conversationJid,
       isMedia,
       isFileUploadNotification,
-      errorType: noError,
+      encrypted,
+      errorType: errorType,
+      warningType: warningType,
       mediaUrl: mediaUrl,
+      key: key,
+      iv: iv,
+      encryptionScheme: encryptionScheme,
       mediaType: mediaType,
       thumbnailData: thumbnailData,
       mediaWidth: mediaWidth,
@@ -270,19 +328,24 @@ class DatabaseService {
       acked: false,
       originId: originId,
       filename: filename,
+      plaintextHashes: plaintextHashes,
+      ciphertextHashes: ciphertextHashes,
+      isUploading: isUploading,
+      isDownloading: isDownloading,
+      mediaSize: mediaSize,
     );
 
-    Message? quotes;
     if (quoteId != null) {
-      quotes = await getMessageByXmppId(quoteId, conversationJid);
+      final quotes = await getMessageByXmppId(quoteId, conversationJid);
       if (quotes == null) {
         _log.warning('Failed to add quote for message with id $quoteId');
+      } else {
+        m = m.copyWith(quotes: quotes);
       }
     }
 
     return m.copyWith(
-      id: await _db.insert('Messages', m.toDatabaseJson(quotes?.id)),
-      quotes: quotes,
+      id: await _db.insert('Messages', m.toDatabaseJson()),
     );
   }
 
@@ -315,19 +378,46 @@ class DatabaseService {
     final msg = messagesRaw.first;
     return Message.fromDatabaseJson(msg, null);
   }
-  
+
+  Future<Message?> getMessageByOriginId(String id, String conversationJid) async {
+    final messagesRaw = await _db.query(
+      'Messages',
+      where: 'conversationJid = ? AND originId = ?',
+      whereArgs: [conversationJid, id],
+      limit: 1,
+    );
+
+    if (messagesRaw.isEmpty) return null;
+
+    // TODO(PapaTutuWawa): Load the quoted message
+    final msg = messagesRaw.first;
+    return Message.fromDatabaseJson(msg, null);
+  }
+
   /// Updates the message item with id [id] inside the database.
   Future<Message> updateMessage(int id, {
-    String? mediaUrl,
-    String? mediaType,
+    Object? body = notSpecified,
+    Object? mediaUrl = notSpecified,
+    Object? mediaType = notSpecified,
+    bool? isMedia,
     bool? received,
     bool? displayed,
     bool? acked,
-    int? errorType,
+    Object? errorType = notSpecified,
+    Object? warningType = notSpecified,
     bool? isFileUploadNotification,
-    String? srcUrl,
-    int? mediaWidth,
-    int? mediaHeight,
+    Object? srcUrl = notSpecified,
+    Object? key = notSpecified,
+    Object? iv = notSpecified,
+    Object? encryptionScheme = notSpecified,
+    Object? mediaWidth = notSpecified,
+    Object? mediaHeight = notSpecified,
+    bool? isDownloading,
+    bool? isUploading,
+    Object? mediaSize = notSpecified,
+    Object? originId = notSpecified,
+    Object? sid = notSpecified,
+    bool? isRetracted,
   }) async {
     final md = (await _db.query(
       'Messages',
@@ -337,11 +427,14 @@ class DatabaseService {
     )).first;
     final m = Map<String, dynamic>.from(md);
 
-    if (mediaUrl != null) {
-      m['mediaUrl'] = mediaUrl;
+    if (mediaUrl != notSpecified) {
+      m['mediaUrl'] = mediaUrl as String?;
     }
-    if (mediaType != null) {
-      m['mediaType'] = mediaType;
+    if (mediaType != notSpecified) {
+      m['mediaType'] = mediaType as String?;
+    }
+    if (isMedia != null) {
+      m['isMedia'] = boolToInt(isMedia);
     }
     if (received != null) {
       m['received'] = boolToInt(received);
@@ -352,20 +445,50 @@ class DatabaseService {
     if (acked != null) {
       m['acked'] = boolToInt(acked);
     }
-    if (errorType != null) {
-      m['errorType'] = errorType;
+    if (errorType != notSpecified) {
+      m['errorType'] = errorType as int?;
+    }
+    if (warningType != notSpecified) {
+      m['warningType'] = warningType as int?;
     }
     if (isFileUploadNotification != null) {
       m['isFileUploadNotification'] = boolToInt(isFileUploadNotification);
     }
-    if (srcUrl != null) {
-      m['srcUrl'] = srcUrl;
+    if (srcUrl != notSpecified) {
+      m['srcUrl'] = srcUrl as String?;
     }
-    if (mediaWidth != null) {
-      m['mediaWidth'] = mediaWidth;
+    if (mediaWidth != notSpecified) {
+      m['mediaWidth'] = mediaWidth as int?;
     }
-    if (mediaHeight != null) {
-      m['mediaHeight'] = mediaHeight;
+    if (mediaHeight != notSpecified) {
+      m['mediaHeight'] = mediaHeight as int?;
+    }
+    if (mediaSize != notSpecified) {
+      m['mediaSize'] = mediaSize as int?;
+    }
+    if (key != notSpecified) {
+      m['key'] = key as String?;
+    }
+    if (iv != notSpecified) {
+      m['iv'] = iv as String?;
+    }
+    if (encryptionScheme != notSpecified) {
+      m['encryptionScheme'] = encryptionScheme as String?;
+    }
+    if (isDownloading != null) {
+      m['isDownloading'] = boolToInt(isDownloading);
+    }
+    if (isUploading != null) {
+      m['isUploading'] = boolToInt(isUploading);
+    }
+    if (sid != notSpecified) {
+      m['sid'] = sid as String?;
+    }
+    if (originId != notSpecified) {
+      m['originId'] = originId as String?;
+    }
+    if (isRetracted != null) {
+      m['isRetracted'] = boolToInt(isRetracted);
     }
 
     await _db.update(
@@ -538,4 +661,275 @@ class DatabaseService {
     
     await batch.commit();
   }
+
+  Future<XmppState> getXmppState() async {
+    final json = <String, String?>{};
+    for (final row in await _db.query(xmppStateTable)) {
+      json[row['key']! as String] = row['value'] as String?;
+    }
+
+    return XmppState.fromDatabaseTuples(json);
+  }
+
+  Future<void> saveXmppState(XmppState state) async {
+    final batch = _db.batch();
+
+    for (final tuple in state.toDatabaseTuples().entries) {
+      batch.insert(
+        xmppStateTable,
+        <String, String?>{ 'key': tuple.key, 'value': tuple.value },
+        conflictAlgorithm: ConflictAlgorithm.replace,
+      );
+    }
+    
+    await batch.commit();
+  }
+  
+  Future<void> saveRatchet(OmemoDoubleRatchetWrapper ratchet) async {
+    final json = await ratchet.ratchet.toJson();
+    await _db.insert(
+      omemoRatchetsTable,
+      {
+        ...json,
+        'mkskipped': jsonEncode(json['mkskipped']),
+        'acknowledged': boolToInt(json['acknowledged']! as bool),
+        'jid': ratchet.jid,
+        'id': ratchet.id,
+      },
+      conflictAlgorithm: ConflictAlgorithm.replace,
+    );
+  }
+
+  Future<List<OmemoDoubleRatchetWrapper>> loadRatchets() async {
+    final results = await _db.query(omemoRatchetsTable);
+
+    return results.map((ratchet) {
+      final json = jsonDecode(ratchet['mkskipped']! as String) as List<dynamic>;
+      final mkskipped = List<Map<String, dynamic>>.empty(growable: true);
+      for (final i in json) {
+        final element = i as Map<String, dynamic>;
+        mkskipped.add({
+          'key': element['key']! as String,
+          'public': element['public']! as String,
+          'n': element['n']! as int,
+        });
+      }
+
+      return OmemoDoubleRatchetWrapper(
+        OmemoDoubleRatchet.fromJson(
+          {
+            ...ratchet,
+            'acknowledged': intToBool(ratchet['acknowledged']! as int),
+            'mkskipped': mkskipped,
+          },
+        ),
+        ratchet['id']! as int,
+        ratchet['jid']! as String,
+      );
+    }).toList();
+  }
+
+  Future<Map<RatchetMapKey, BTBVTrustState>> loadTrustCache() async {
+    final entries = await _db.query(omemoTrustCacheTable);
+
+    final mapEntries = entries.map<MapEntry<RatchetMapKey, BTBVTrustState>>((entry) {
+      // TODO(PapaTutuWawa): Expose this from omemo_dart
+      BTBVTrustState state;
+      final value = entry['trust']! as int;
+      if (value == 1) {
+        state = BTBVTrustState.notTrusted;
+      } else if (value == 2) {
+        state = BTBVTrustState.blindTrust;
+      } else if (value == 3) {
+        state = BTBVTrustState.verified;
+      } else {
+        state = BTBVTrustState.notTrusted;
+      }
+
+      return MapEntry(
+        RatchetMapKey.fromJsonKey(entry['key']! as String),
+        state,
+      );
+    });
+
+    return Map.fromEntries(mapEntries);
+  }
+
+  Future<void> saveTrustCache(Map<String, int> cache) async {
+    final batch = _db.batch();
+
+    // ignore: cascade_invocations
+    batch.delete(omemoTrustCacheTable);
+    for (final entry in cache.entries) {
+      batch.insert(
+        omemoTrustCacheTable,
+        {
+          'key': entry.key,
+          'trust': entry.value,
+        },
+        conflictAlgorithm: ConflictAlgorithm.replace,
+      );
+    }
+
+    await batch.commit();
+  }
+
+  Future<Map<RatchetMapKey, bool>> loadTrustEnablementList() async {
+    final entries = await _db.query(omemoTrustEnableListTable);
+
+    final mapEntries = entries.map<MapEntry<RatchetMapKey, bool>>((entry) {
+      return MapEntry(
+        RatchetMapKey.fromJsonKey(entry['key']! as String),
+        intToBool(entry['enabled']! as int),
+      );
+    });
+
+    return Map.fromEntries(mapEntries);
+  }
+
+  Future<void> saveTrustEnablementList(Map<String, bool> list) async {
+    final batch = _db.batch();
+
+    // ignore: cascade_invocations
+    batch.delete(omemoTrustEnableListTable);
+    for (final entry in list.entries) {
+      batch.insert(
+        omemoTrustEnableListTable,
+        {
+          'key': entry.key,
+          'enabled': boolToInt(entry.value),
+        },
+        conflictAlgorithm: ConflictAlgorithm.replace,
+      );
+    }
+
+    await batch.commit();
+  }
+
+  Future<Map<String, List<int>>> loadTrustDeviceList() async {
+    final entries = await _db.query(omemoTrustDeviceListTable);
+
+    final map = <String, List<int>>{};
+    for (final entry in entries) {
+      final key = entry['jid']! as String;
+      final device = entry['device']! as int;
+
+      if (map.containsKey(key)) {
+        map[key]!.add(device);
+      } else {
+        map[key] = [device];
+      }
+    }
+
+    return map;
+  }
+
+  Future<void> saveTrustDeviceList(Map<String, List<int>> list) async {
+    final batch = _db.batch();
+
+    // ignore: cascade_invocations
+    batch.delete(omemoTrustDeviceListTable);
+    for (final entry in list.entries) {
+      for (final device in entry.value) {
+        batch.insert(
+          omemoTrustDeviceListTable,
+          {
+            'jid': entry.key,
+            'device': device,
+          },
+          conflictAlgorithm: ConflictAlgorithm.replace,
+        );
+      }
+    }
+
+    await batch.commit();
+  }
+
+  Future<void> saveOmemoDevice(Device device) async {
+    await _db.insert(
+      omemoDeviceTable,
+      {
+        'jid': device.jid,
+        'id': device.id,
+        'data': jsonEncode(await device.toJson()),
+      },
+      conflictAlgorithm: ConflictAlgorithm.replace,
+    );
+  }
+
+  Future<Device?> loadOmemoDevice(String jid) async {
+    final data = await _db.query(
+      omemoDeviceTable,
+      where: 'jid = ?',
+      whereArgs: [jid],
+      limit: 1,
+    );
+    if (data.isEmpty) return null;
+
+    final deviceJson = jsonDecode(data.first['data']! as String) as Map<String, dynamic>;
+    // NOTE: We need to do this because Dart otherwise complains about not being able
+    //       to cast dynamic to List<int>.
+    final opks = List<Map<String, dynamic>>.empty(growable: true);
+    final opksIter = deviceJson['opks']! as List<dynamic>;
+    for (final _opk in opksIter) {
+      final opk = _opk as Map<String, dynamic>;
+      opks.add(<String, dynamic>{
+        'id': opk['id']! as int,
+        'public': opk['public']! as String,
+        'private': opk['private']! as String,
+      });
+    }
+    deviceJson['opks'] = opks;
+    return Device.fromJson(deviceJson);
+  }
+
+  Future<Map<String, List<int>>> loadOmemoDeviceList() async {
+    final list = await _db.query(omemoDeviceListTable);
+    final map = <String, List<int>>{};
+    for (final entry in list) {
+      final key = entry['jid']! as String;
+      final id = entry['id']! as int;
+
+      if (map.containsKey(key)) {
+        map[key]!.add(id);
+      } else {
+        map[key] = [id];
+      }
+    }
+
+    return map;
+  }
+
+  Future<void> saveOmemoDeviceList(Map<String, List<int>> list) async {
+    final batch = _db.batch();
+
+    // ignore: cascade_invocations
+    batch.delete(omemoDeviceListTable);
+    for (final entry in list.entries) {
+      for (final id in entry.value) {
+        batch.insert(
+          omemoDeviceListTable,
+          {
+            'jid': entry.key,
+            'id': id,
+          },
+          conflictAlgorithm: ConflictAlgorithm.replace,
+        );
+      }
+    }
+
+    await batch.commit();
+  }
+
+  Future<void> emptyOmemoSessionTables() async {
+    final batch = _db.batch();
+
+    // ignore: cascade_invocations
+    batch
+      ..delete(omemoRatchetsTable)
+      ..delete(omemoTrustCacheTable)
+      ..delete(omemoTrustEnableListTable);
+
+    await batch.commit();
+  }
 }

lib/service/database/migrations/0000_language.dart

@@ -0,0 +1,15 @@
+import 'package:moxxyv2/service/database/constants.dart';
+import 'package:moxxyv2/shared/models/preference.dart';
+import 'package:sqflite_sqlcipher/sqflite.dart';
+
+Future<void> upgradeFromV2ToV3(Database db) async {
+  // Set a default locale
+  await db.insert(
+    preferenceTable,
+    Preference(
+      'languageLocaleCode',
+      typeString,
+      'default',
+    ).toDatabaseJson(),
+  );
+}

lib/service/database/migrations/0000_retraction.dart

@@ -0,0 +1,11 @@
+import 'package:moxxyv2/service/database/constants.dart';
+import 'package:moxxyv2/service/database/helpers.dart';
+import 'package:moxxyv2/shared/models/preference.dart';
+import 'package:sqflite_sqlcipher/sqflite.dart';
+
+Future<void> upgradeFromV3ToV4(Database db) async {
+  // Mark all messages as not retracted
+  await db.execute(
+    'ALTER TABLE $messsagesTable ADD COLUMN isRetracted INTEGER DEFAULT ${boolToInt(false)};',
+  );
+}

lib/service/database/migrations/0000_retraction_conversation.dart

@@ -0,0 +1,14 @@
+import 'package:moxxyv2/service/database/constants.dart';
+import 'package:moxxyv2/service/database/helpers.dart';
+import 'package:moxxyv2/shared/models/preference.dart';
+import 'package:sqflite_sqlcipher/sqflite.dart';
+
+Future<void> upgradeFromV4ToV5(Database db) async {
+  // Give all conversations a pseudo last message data
+  await db.execute(
+    'ALTER TABLE $conversationsTable ADD COLUMN lastMessageId INTEGER NOT NULL DEFAULT 0;',
+  );
+  await db.execute(
+    'ALTER TABLE $conversationsTable ADD COLUMN lastMessageRetracted INTEGER NOT NULL DEFAULT ${boolToInt(false)};',
+  );
+}

lib/service/database/migrations/0000_xmpp_state.dart

@@ -0,0 +1,13 @@
+import 'package:moxxyv2/service/database/constants.dart';
+import 'package:sqflite_sqlcipher/sqflite.dart';
+
+Future<void> upgradeFromV1ToV2(Database db) async {
+  // Create the table
+  await db.execute(
+    '''
+    CREATE TABLE $xmppStateTable (
+      key   TEXT PRIMARY KEY,
+      value TEXT
+    )''',
+  );
+}

lib/service/events.dart

@@ -1,16 +1,23 @@
 import 'dart:async';
-
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/service/avatars.dart';
 import 'package:moxxyv2/service/blocking.dart';
 import 'package:moxxyv2/service/conversation.dart';
 import 'package:moxxyv2/service/database/database.dart';
+import 'package:moxxyv2/service/helpers.dart';
 import 'package:moxxyv2/service/httpfiletransfer/helpers.dart';
 import 'package:moxxyv2/service/httpfiletransfer/httpfiletransfer.dart';
 import 'package:moxxyv2/service/httpfiletransfer/jobs.dart';
+import 'package:moxxyv2/service/httpfiletransfer/location.dart';
+import 'package:moxxyv2/service/language.dart';
 import 'package:moxxyv2/service/message.dart';
 import 'package:moxxyv2/service/moxxmpp/reconnect.dart';
+import 'package:moxxyv2/service/omemo/omemo.dart';
 import 'package:moxxyv2/service/preferences.dart';
 import 'package:moxxyv2/service/roster.dart';
 import 'package:moxxyv2/service/service.dart';
@@ -20,16 +27,7 @@ import 'package:moxxyv2/shared/commands.dart';
 import 'package:moxxyv2/shared/eventhandler.dart';
 import 'package:moxxyv2/shared/events.dart';
 import 'package:moxxyv2/shared/helpers.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/jid.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/negotiators/namespaces.dart';
-import 'package:moxxyv2/xmpp/settings.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0191.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0198/negotiator.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0352.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0363.dart';
+import 'package:moxxyv2/shared/models/preferences.dart';
 import 'package:permission_handler/permission_handler.dart';
 
 void setupBackgroundEventHandler() {
@@ -56,6 +54,14 @@ void setupBackgroundEventHandler() {
       EventTypeMatcher<SignOutCommand>(performSignOut),
       EventTypeMatcher<SendFilesCommand>(performSendFiles),
       EventTypeMatcher<SetConversationMuteStatusCommand>(performSetMuteState),
+      EventTypeMatcher<GetConversationOmemoFingerprintsCommand>(performGetOmemoFingerprints),
+      EventTypeMatcher<SetOmemoDeviceEnabledCommand>(performEnableOmemoKey),
+      EventTypeMatcher<RecreateSessionsCommand>(performRecreateSessions),
+      EventTypeMatcher<SetOmemoEnabledCommand>(performSetOmemoEnabled),
+      EventTypeMatcher<GetOwnOmemoFingerprintsCommand>(performGetOwnOmemoFingerprints),
+      EventTypeMatcher<RemoveOwnDeviceCommand>(performRemoveOwnDevice),
+      EventTypeMatcher<RegenerateOwnDeviceCommand>(performRegenerateOwnDevice),
+      EventTypeMatcher<RetractMessageComment>(performMessageRetraction),
   ]);
 
   GetIt.I.registerSingleton<EventHandler>(handler);
@@ -79,68 +85,83 @@ Future<void> performLogin(LoginCommand command, { dynamic extra }) async {
 
   // ignore: avoid_dynamic_calls
   if (result.success) {
+    final preferences = await GetIt.I.get<PreferencesService>().getPreferences();
     GetIt.I.get<MoxxyReconnectionPolicy>().setShouldReconnect(true);
     final settings = GetIt.I.get<XmppConnection>().getConnectionSettings();
     sendEvent(
       LoginSuccessfulEvent(
         jid: settings.jid.toString(),
-        displayName: settings.jid.local,
+        preStart: await _buildPreStartDoneEvent(preferences),
       ),
       id:id,
     );
-
-    // TODO(Unknown): Send the data of the [PreStartDoneEvent]
   } else {
     GetIt.I.get<MoxxyReconnectionPolicy>().setShouldReconnect(false);
     sendEvent(
       LoginFailureEvent(
-        reason: result.reason!,
+        reason: xmppErrorToTranslatableString(result.error!),
       ),
       id: id,
     );
   }
 }
 
+Future<PreStartDoneEvent> _buildPreStartDoneEvent(PreferencesState preferences) async {
+  final xmpp = GetIt.I.get<XmppService>();
+  final state = await xmpp.getXmppState();
+
+  await GetIt.I.get<RosterService>().loadRosterFromDatabase();
+
+  // Check some permissions
+  final storagePerm = await Permission.storage.status;
+  final permissions = List<int>.empty(growable: true);
+  if (storagePerm.isDenied /*&& !state.askedStoragePermission*/) {
+    permissions.add(Permission.storage.value);
+
+    await xmpp.modifyXmppState((state) => state.copyWith(
+        askedStoragePermission: true,
+    ),);
+  }
+
+  return PreStartDoneEvent(
+    state: 'logged_in',
+    jid: state.jid,
+    displayName: state.displayName ?? state.jid!.split('@').first,
+    avatarUrl: state.avatarUrl,
+    avatarHash: state.avatarHash,
+    permissionsToRequest: permissions,
+    preferences: preferences,
+    conversations: (await GetIt.I.get<DatabaseService>().loadConversations()).where((c) => c.open).toList(),
+    roster: await GetIt.I.get<RosterService>().loadRosterFromDatabase(),
+  );
+}
+
 Future<void> performPreStart(PerformPreStartCommand command, { dynamic extra }) async {
   final id = extra as String;
-
+  
   // Prevent a race condition where the UI sends the prestart command before the service
   // has finished setting everything up
   GetIt.I.get<Logger>().finest('Waiting for preStart future to complete..');
   await GetIt.I.get<Completer<void>>().future;
   GetIt.I.get<Logger>().finest('PreStart future done');
 
-  final xmpp = GetIt.I.get<XmppService>();
-  final settings = await xmpp.getConnectionSettings();
-  final state = await xmpp.getXmppState();
   final preferences = await GetIt.I.get<PreferencesService>().getPreferences();
 
+  // Set the locale very early
+  GetIt.I.get<LanguageService>().defaultLocale = command.systemLocaleCode;
+  if (preferences.languageLocaleCode == 'default') {
+    LocaleSettings.setLocaleRaw(command.systemLocaleCode);
+  } else {
+    LocaleSettings.setLocaleRaw(preferences.languageLocaleCode);
+  }
+  GetIt.I.get<XmppService>().setNotificationText(
+    await GetIt.I.get<XmppConnection>().getConnectionState(),
+  );
+
+  final settings = await GetIt.I.get<XmppService>().getConnectionSettings();
   if (settings != null) {
-    await GetIt.I.get<RosterService>().loadRosterFromDatabase();
-
-    // Check some permissions
-    final storagePerm = await Permission.storage.status;
-    final permissions = List<int>.empty(growable: true);
-    if (storagePerm.isDenied /*&& !state.askedStoragePermission*/) {
-      permissions.add(Permission.storage.value);
-
-      await xmpp.modifyXmppState((state) => state.copyWith(
-          askedStoragePermission: true,
-      ),);
-    }
-    
     sendEvent(
-      PreStartDoneEvent(
-        state: 'logged_in',
-        jid: state.jid,
-        displayName: state.displayName ?? state.jid!.split('@').first,
-        avatarUrl: state.avatarUrl,
-        avatarHash: state.avatarHash,
-        permissionsToRequest: permissions,
-        preferences: preferences,
-        conversations: (await GetIt.I.get<DatabaseService>().loadConversations()).where((c) => c.open).toList(),
-        roster: await GetIt.I.get<RosterService>().loadRosterFromDatabase(),
-      ),
+      await _buildPreStartDoneEvent(preferences),
       id: id,
     );
   } else {
@@ -185,6 +206,8 @@ Future<void> performAddConversation(AddConversationCommand command, { dynamic ex
   } else {
     final conversation = await cs.addConversationFromData(
       command.title,
+      -1,
+      false,
       command.lastMessageBody,
       command.avatarUrl,
       command.jid,
@@ -193,6 +216,7 @@ Future<void> performAddConversation(AddConversationCommand command, { dynamic ex
       true,
       // TODO(PapaTutuWawa): Take as an argument
       false,
+      (await GetIt.I.get<PreferencesService>().getPreferences()).enableOmemoByDefault,
     );
 
     sendEvent(
@@ -261,6 +285,21 @@ Future<void> performSetCSIState(SetCSIStateCommand command, { dynamic extra }) a
 
 Future<void> performSetPreferences(SetPreferencesCommand command, { dynamic extra }) async {
   await GetIt.I.get<PreferencesService>().modifyPreferences((_) => command.preferences);
+
+  // Set the logging mode
+  if (!kDebugMode) {
+    final enableDebug = command.preferences.debugEnabled;
+    Logger.root.level = enableDebug ? Level.ALL : Level.INFO;
+  }
+
+  // Set the locale
+  final locale = command.preferences.languageLocaleCode == 'default' ?
+    GetIt.I.get<LanguageService>().defaultLocale :
+    command.preferences.languageLocaleCode;
+  LocaleSettings.setLocaleRaw(locale);
+  GetIt.I.get<XmppService>().setNotificationText(
+    await GetIt.I.get<XmppConnection>().getConnectionState(),
+  );
 }
 
 Future<void> performAddContact(AddContactCommand command, { dynamic extra }) async {
@@ -288,6 +327,8 @@ Future<void> performAddContact(AddContactCommand command, { dynamic extra }) asy
   } else {            
     final c = await cs.addConversationFromData(
       jid.split('@')[0],
+      -1,
+      false,
       '',
       '',
       jid,
@@ -296,6 +337,7 @@ Future<void> performAddContact(AddContactCommand command, { dynamic extra }) asy
       true,
       // TODO(PapaTutuWawa): Take as an argument
       false,
+      (await GetIt.I.get<PreferencesService>().getPreferences()).enableOmemoByDefault,
     );
     sendEvent(
       AddContactResultEvent(conversation: c, added: true),
@@ -311,22 +353,36 @@ Future<void> performAddContact(AddContactCommand command, { dynamic extra }) asy
 }
 
 Future<void> performRequestDownload(RequestDownloadCommand command, { dynamic extra }) async {
-  sendEvent(MessageUpdatedEvent(message: command.message.copyWith(isDownloading: true)));
-
+  final ms = GetIt.I.get<MessageService>();
   final srv = GetIt.I.get<HttpFileTransferService>();
+
+  final message = await ms.updateMessage(
+    command.message.id,
+    isDownloading: true,
+  );
+  sendEvent(MessageUpdatedEvent(message: message));
+
   final metadata = await peekFile(command.message.srcUrl!);
 
   // TODO(Unknown): Maybe deduplicate with the code in the xmpp service
   // NOTE: This either works by returing "jpg" for ".../hallo.jpg" or fails
   //       for ".../aaaaaaaaa", in which case we would've failed anyways.
-  final ext = command.message.srcUrl!.split('.').last;
+  final ext = message.srcUrl!.split('.').last;
   final mimeGuess = metadata.mime ?? guessMimeTypeFromExtension(ext);
 
   await srv.downloadFile(
     FileDownloadJob(
-      command.message.srcUrl!,
-      command.message.id,
-      command.message.conversationJid,
+      MediaFileLocation(
+        message.srcUrl!,
+        message.filename ?? filenameFromUrl(message.srcUrl!),
+        message.encryptionScheme,
+        message.key != null ? base64Decode(message.key!) : null,
+        message.iv != null ? base64Decode(message.iv!) : null,
+        message.plaintextHashes,
+        message.ciphertextHashes,
+      ),
+      message.id,
+      message.conversationJid,
       mimeGuess,
     ),
   );
@@ -441,3 +497,139 @@ Future<void> performSetMuteState(SetConversationMuteStatusCommand command, { dyn
 
   sendEvent(ConversationUpdatedEvent(conversation: newConversation));
 }
+
+Future<void> performGetOmemoFingerprints(GetConversationOmemoFingerprintsCommand command, { dynamic extra }) async {
+  final id = extra as String;
+
+  final omemo = GetIt.I.get<OmemoService>();
+  sendEvent(
+    GetConversationOmemoFingerprintsResult(
+      fingerprints: await omemo.getOmemoKeysForJid(command.jid),
+    ),
+    id: id,
+  );
+}
+
+Future<void> performEnableOmemoKey(SetOmemoDeviceEnabledCommand command, { dynamic extra }) async {
+  final id = extra as String;
+
+  final omemo = GetIt.I.get<OmemoService>();
+  await omemo.setOmemoKeyEnabled(command.jid, command.deviceId, command.enabled);
+
+  await performGetOmemoFingerprints(
+    GetConversationOmemoFingerprintsCommand(jid: command.jid),
+    extra: id,
+  );
+}
+
+Future<void> performRecreateSessions(RecreateSessionsCommand command, { dynamic extra }) async {
+  await GetIt.I.get<OmemoService>().removeAllSessions(command.jid);
+
+  final conn = GetIt.I.get<XmppConnection>();
+  await conn.getManagerById<OmemoManager>(omemoManager)!.sendEmptyMessage(
+    JID.fromString(command.jid),
+    findNewSessions: true,
+  );
+}
+
+Future<void> performSetOmemoEnabled(SetOmemoEnabledCommand command, { dynamic extra }) async {
+  final cs = GetIt.I.get<ConversationService>();
+  final conversation = await cs.getConversationByJid(command.jid);
+  await cs.updateConversation(
+    conversation!.id,
+    encrypted: command.enabled,
+  );
+}
+
+Future<void> performGetOwnOmemoFingerprints(GetOwnOmemoFingerprintsCommand command, { dynamic extra }) async {
+  final id = extra as String;
+  final os = GetIt.I.get<OmemoService>();
+  final xs = GetIt.I.get<XmppService>();
+  await os.ensureInitialized();
+
+  final jid = (await xs.getConnectionSettings())!.jid;
+  sendEvent(
+    GetOwnOmemoFingerprintsResult(
+      ownDeviceFingerprint: await os.getDeviceFingerprint(),
+      ownDeviceId: await os.getDeviceId(),
+      fingerprints: await os.getOwnFingerprints(jid),
+    ),
+    id: id,
+  );
+}
+
+Future<void> performRemoveOwnDevice(RemoveOwnDeviceCommand command, { dynamic extra }) async {
+  await GetIt.I.get<XmppConnection>()
+    .getManagerById<OmemoManager>(omemoManager)!
+    .deleteDevice(command.deviceId);
+}
+
+Future<void> performRegenerateOwnDevice(RegenerateOwnDeviceCommand command, { dynamic extra }) async {
+  final id = extra as String;
+  final jid = GetIt.I.get<XmppConnection>()
+    .getConnectionSettings()
+    .jid.toBare()
+    .toString();
+  final device = await GetIt.I.get<OmemoService>().regenerateDevice(jid);
+
+  sendEvent(
+    RegenerateOwnDeviceResult(device: device),
+    id: id,
+  );
+}
+
+Future<void> performMessageRetraction(RetractMessageComment command, { dynamic extra }) async {
+  final msg = await GetIt.I.get<DatabaseService>().getMessageByOriginId(
+    command.originId,
+    command.conversationJid,
+  );
+
+  if (msg == null) {
+    GetIt.I.get<Logger>().warning('Failed to find message ${command.conversationJid}#${command.originId} for message retraction');
+    return;
+  }
+
+  // Send the retraction
+  (GetIt.I.get<XmppConnection>().getManagerById(messageManager)! as MessageManager)
+    .sendMessage(
+      MessageDetails(
+        to: command.conversationJid,
+        messageRetraction: MessageRetractionData(
+          command.originId,
+          t.messages.retractedFallback,
+        ),
+      ),
+    );
+  
+  // Update the database
+  final retractedMessage = await GetIt.I.get<MessageService>().updateMessage(
+    msg.id,
+    isMedia: false,
+    mediaUrl: null,
+    mediaType: null,
+    warningType: null,
+    errorType: null,
+    srcUrl: null,
+    key: null,
+    iv: null,
+    encryptionScheme: null,
+    mediaWidth: null,
+    mediaHeight: null,
+    mediaSize: null,
+    isRetracted: true,
+  );
+  sendEvent(MessageUpdatedEvent(message: retractedMessage));
+
+  final cs = GetIt.I.get<ConversationService>();
+  final conversation = await cs.getConversationByJid(
+    command.conversationJid,
+  );
+  if (conversation != null && conversation.lastMessageId == msg.id) {
+    final newConversation = await cs.updateConversation(
+      conversation.id,
+      lastMessageBody: '',
+      lastMessageRetracted: true,
+    );
+    sendEvent(ConversationUpdatedEvent(conversation: newConversation));
+  }
+}

lib/service/helpers.dart

@@ -1,23 +1,27 @@
 import 'dart:io';
 import 'dart:typed_data';
 import 'dart:ui';
+import 'package:flutter/foundation.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:native_imaging/native_imaging.dart' as native;
 
-/// Generate a blurhash thumbnail using native_imaging.
-Future<String?> generateBlurhashThumbnail(String path) async {
+Future<String?> _generateBlurhashThumbnailImpl(String path) async {
   await native.init();
 
   final bytes = await File(path).readAsBytes();
 
   native.Image image;
+  int width;
+  int height;
   try {
     final dartCodec = await instantiateImageCodec(bytes);
     final dartFrame = await dartCodec.getNextFrame();
     final rgbaData = await dartFrame.image.toByteData();
     if (rgbaData == null) return null;
 
-    final width = dartFrame.image.width;
-    final height = dartFrame.image.height;
+    width = dartFrame.image.width;
+    height = dartFrame.image.height;
 
     dartFrame.image.dispose();
     dartCodec.dispose();
@@ -36,7 +40,37 @@ Future<String?> generateBlurhashThumbnail(String path) async {
     return null;
   }
 
-  final blurhash = image.toBlurhash(3, 3);
+  // Scale the image down as recommended by
+  // https://github.com/woltapp/blurhash#how-fast-is-encoding-decoding
+  final scaled = image.resample(
+    20,
+    (height * (width / height)).toInt(),
+    native.Transform.bilinear,
+  );
+
+  // Calculate the blurhash
+  final blurhash = scaled.toBlurhash(3, 3);
+
+  // Free resources
   image.free();
+  scaled.free();
   return blurhash;
 }
+
+/// Generate a blurhash thumbnail using native_imaging.
+Future<String?> generateBlurhashThumbnail(String path) async {
+  return compute(_generateBlurhashThumbnailImpl, path);
+}
+
+/// Turn a XmppError into its corresponding translated string.
+String xmppErrorToTranslatableString(XmppError error) {
+  if (error is StartTLSFailedError) {
+    return t.errors.login.startTlsFailed;
+  } else if (error is SaslFailedError) {
+    return t.errors.login.saslFailed;
+  } else if (error is NoConnectionError) {
+    return t.errors.login.noConnection;
+  }
+  
+  return t.errors.login.unspecified;
+}

lib/service/httpfiletransfer/httpfiletransfer.dart

@@ -1,6 +1,8 @@
 import 'dart:async';
 import 'dart:collection';
+import 'dart:convert';
 import 'dart:io';
+import 'dart:math';
 import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:dio/dio.dart' as dio;
 import 'package:get_it/get_it.dart';
@@ -9,8 +11,11 @@ import 'package:image_size_getter/image_size_getter.dart';
 import 'package:logging/logging.dart';
 import 'package:mime/mime.dart';
 import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/connectivity.dart';
 import 'package:moxxyv2/service/conversation.dart';
+import 'package:moxxyv2/service/cryptography/cryptography.dart';
+import 'package:moxxyv2/service/cryptography/types.dart';
 import 'package:moxxyv2/service/database/database.dart';
 import 'package:moxxyv2/service/httpfiletransfer/helpers.dart';
 import 'package:moxxyv2/service/httpfiletransfer/jobs.dart';
@@ -20,14 +25,12 @@ import 'package:moxxyv2/service/service.dart';
 import 'package:moxxyv2/shared/error_types.dart';
 import 'package:moxxyv2/shared/events.dart';
 import 'package:moxxyv2/shared/models/media.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/message.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0363.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0446.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0447.dart';
+import 'package:moxxyv2/shared/warning_types.dart';
 import 'package:path/path.dart' as pathlib;
+import 'package:path_provider/path_provider.dart';
+import 'package:random_string/random_string.dart';
 import 'package:synchronized/synchronized.dart';
+import 'package:uuid/uuid.dart';
 
 /// This service is responsible for managing the up- and download of files using Http.
 class HttpFileTransferService {
@@ -136,11 +139,52 @@ class HttpFileTransferService {
       );
     }
   }
-  
+
+  Future<void> _fileUploadFailed(FileUploadJob job, int error) async {
+    final ms = GetIt.I.get<MessageService>();
+
+    // Notify UI of upload failure
+    for (final recipient in job.recipients) {
+      final msg = await ms.updateMessage(
+        job.messageMap[recipient]!.id,
+        errorType: error,
+        isUploading: false,
+      );
+      sendEvent(MessageUpdatedEvent(message: msg));
+    }
+
+    await _pickNextUploadTask();
+  }
+
   /// Actually attempt to upload the file described by the job [job].
   Future<void> _performFileUpload(FileUploadJob job) async {
     _log.finest('Beginning upload of ${job.path}');
-    final file = File(job.path);
+
+    var path = job.path;
+    final useEncryption = job.encryptMap.entries.every((entry) => entry.value);
+    EncryptionResult? encryption;
+    if (useEncryption) {
+      final tempDir = await getTemporaryDirectory();
+      final randomFilename = randomAlphaNumeric(
+        20,
+        provider: CoreRandomProvider.from(Random.secure()),
+      );
+      path = pathlib.join(tempDir.path, randomFilename);
+
+      try {
+        encryption = await GetIt.I.get<CryptographyService>().encryptFile(
+          job.path,
+          path,
+          SFSEncryptionType.aes256GcmNoPadding,
+        );
+      } catch (ex) {
+        _log.warning('Encrypting ${job.path} failed: $ex');
+        await _fileUploadFailed(job, messageFailedToEncryptFile);
+        return;
+      }
+    }
+
+    final file = File(path);
     final data = await file.readAsBytes();
     final stat = file.statSync();
 
@@ -148,17 +192,16 @@ class HttpFileTransferService {
     final conn = GetIt.I.get<XmppConnection>();
     final httpManager = conn.getManagerById<HttpFileUploadManager>(httpFileUploadManager)!;
     final slotResult = await httpManager.requestUploadSlot(
-      pathlib.basename(job.path),
+      pathlib.basename(path),
       stat.size,
     );
 
-    if (slotResult.isError()) {
+    if (slotResult.isType<HttpFileUploadError>()) {
       _log.severe('Failed to request upload slot for ${job.path}!');
-      await _nextUploadJob();
+      await _fileUploadFailed(job, fileUploadFailedError);
       return;
     }
-
-    final slot = slotResult.getValue();
+    final slot = slotResult.get<HttpFileUploadSlot>();
     try {
       final response = await dio.Dio().putUri<dynamic>(
         Uri.parse(slot.putUrl),
@@ -187,38 +230,56 @@ class HttpFileTransferService {
       if (response.statusCode != 201) {
         // TODO(PapaTutuWawa): Trigger event
         _log.severe('Upload failed');
-
-        // Notify UI of upload failure
-        for (final recipient in job.recipients) {
-          final msg = await ms.updateMessage(
-            job.messageMap[recipient]!.id,
-            errorType: fileUploadFailedError,
-          );
-          sendEvent(
-            MessageUpdatedEvent(
-              message: msg.copyWith(isUploading: false),
-            ),
-          );
-        }
+        await _fileUploadFailed(job, fileUploadFailedError);
+        return;
       } else {
         _log.fine('Upload was successful');
 
+        const uuid = Uuid();
         for (final recipient in job.recipients) {
           // Notify UI of upload completion
-          var msg = job.messageMap[recipient]!;
-
-          // Reset a stored error, if there was one
-          if (msg.errorType != null) {
-            msg = await ms.updateMessage(
-              msg.id,
-              errorType: noError,
-            );
-          }
-          sendEvent(
-            MessageUpdatedEvent(
-              message: msg.copyWith(isUploading: false),
-            ),
+          var msg = await ms.updateMessage(
+            job.messageMap[recipient]!.id,
+            mediaSize: stat.size,
+            errorType: noError,
+            encryptionScheme: encryption != null ?
+              SFSEncryptionType.aes256GcmNoPadding.toNamespace() :
+              null,
+            key: encryption != null ? base64Encode(encryption.key) : null,
+            iv: encryption != null ? base64Encode(encryption.iv) : null,
+            isUploading: false,
+            srcUrl: slot.getUrl,
           );
+          // TODO(Unknown): Maybe batch those two together?
+          final oldSid = msg.sid;
+          msg = await ms.updateMessage(
+            msg.id,
+            sid: uuid.v4(),
+            originId: uuid.v4(),
+          );
+          sendEvent(MessageUpdatedEvent(message: msg));
+
+          StatelessFileSharingSource source;
+          final plaintextHashes = <String, String>{};
+          if (encryption != null) {
+            source = StatelessFileSharingEncryptedSource(
+              SFSEncryptionType.aes256GcmNoPadding,
+              encryption.key,
+              encryption.iv,
+              encryption.ciphertextHashes,
+              StatelessFileSharingUrlSource(slot.getUrl),
+            );
+
+            plaintextHashes.addAll(encryption.plaintextHashes);
+          } else {
+            source = StatelessFileSharingUrlSource(slot.getUrl);
+            try {
+              plaintextHashes[hashSha256] = await GetIt.I.get<CryptographyService>()
+                .hashFile(job.path, HashFunction.sha256);
+            } catch (ex) {
+              _log.warning('Failed to hash file ${job.path} using SHA-256: $ex');
+            }
+          }
 
           // Send the message to the recipient
           conn.getManagerById<MessageManager>(messageManager)!.sendMessage(
@@ -226,6 +287,7 @@ class HttpFileTransferService {
               to: recipient,
               body: slot.getUrl,
               requestDeliveryReceipt: true,
+              id: msg.sid,
               originId: msg.originId,
               sfs: StatelessFileSharingData(
                 FileMetadataData(
@@ -233,10 +295,12 @@ class HttpFileTransferService {
                   size: stat.size,
                   name: pathlib.basename(job.path),
                   thumbnails: job.thumbnails,
+                  hashes: plaintextHashes,
                 ),
-                slot.getUrl,
+                <StatelessFileSharingSource>[source],
               ),
-              funReplacement: msg.sid,
+              shouldEncrypt: job.encryptMap[recipient]!,
+              funReplacement: oldSid,
             ),
           );
           _log.finest('Sent message with file upload for ${job.path} to $recipient');
@@ -249,15 +313,15 @@ class HttpFileTransferService {
         }
       }
     } on dio.DioError {
-      // TODO(PapaTutuWawa): Check if this is a timeout
       _log.finest('Upload failed due to connection error');
+      await _fileUploadFailed(job, fileUploadFailedError);
       return;
     }
 
-    await _nextUploadJob();
+    await _pickNextUploadTask();
   }
 
-  Future<void> _nextUploadJob() async {
+  Future<void> _pickNextUploadTask() async {
     // Free the upload resources for the next one
     if (GetIt.I.get<ConnectivityService>().currentState == ConnectivityResult.none) return;
     await _uploadLock.synchronized(() async {
@@ -269,18 +333,39 @@ class HttpFileTransferService {
       }
     });
   }
-  
+
+  Future<void> _fileDownloadFailed(FileDownloadJob job, int error) async {
+    final ms = GetIt.I.get<MessageService>();
+
+    // Notify UI of download failure
+    final msg = await ms.updateMessage(
+      job.mId,
+      errorType: error,
+      isDownloading: false,
+    );
+    sendEvent(MessageUpdatedEvent(message: msg));
+
+    await _pickNextDownloadTask();
+  }
+
   /// Actually attempt to download the file described by the job [job].
   Future<void> _performFileDownload(FileDownloadJob job) async {
-    _log.finest('Downloading ${job.url}');
-    final uri = Uri.parse(job.url);
-    final filename = uri.pathSegments.last;
+    final filename = job.location.filename;
+    _log.finest('Downloading ${job.location.url} as $filename');
     final downloadedPath = await getDownloadPath(filename, job.conversationJid, job.mimeGuess);
 
+    var downloadPath = downloadedPath;
+    if (job.location.key != null && job.location.iv != null) {
+      // The file was encrypted
+      final tempDir = await getTemporaryDirectory();
+      downloadPath = pathlib.join(tempDir.path, filename);
+    }
+
+    dio.Response<dynamic>? response;
     try {
-      final response = await dio.Dio().downloadUri(
-        uri,
-        downloadedPath,
+      response = await dio.Dio().downloadUri(
+        Uri.parse(job.location.url),
+        downloadPath,
         onReceiveProgress: (count, total) {
           final progress = count.toDouble() / total.toDouble();
           sendEvent(
@@ -291,73 +376,132 @@ class HttpFileTransferService {
           );
         },
       );
-
-      if (!isRequestOkay(response.statusCode)) {
-        // TODO(PapaTutuWawa): Error handling
-        // TODO(PapaTutuWawa): Trigger event
-        _log.warning('HTTP GET of ${job.url} returned ${response.statusCode}');
-      } else {
-        // Check the MIME type
-        final notification = GetIt.I.get<NotificationsService>();
-        final mime = job.mimeGuess ?? lookupMimeType(downloadedPath);
-
-        int? mediaWidth;
-        int? mediaHeight;
-        if (mime != null) {
-          if (mime.startsWith('image/')) {
-            MoxplatformPlugin.media.scanFile(downloadedPath);
-
-            // Find out the dimensions
-            // TODO(Unknown): Restrict to the library's supported file types
-            final size = ImageSizeGetter.getSize(FileInput(File(downloadedPath)));
-            mediaWidth = size.width;
-            mediaHeight = size.height;
-          } else if (mime.startsWith('video/')) {
-            // TODO(Unknown): Also figure out the thumbnail size here
-            MoxplatformPlugin.media.scanFile(downloadedPath);
-          } else if (mime.startsWith('audio/')) {
-            MoxplatformPlugin.media.scanFile(downloadedPath);
-          }
-        }
-        
-        final msg = await GetIt.I.get<MessageService>().updateMessage(
-          job.mId,
-          mediaUrl: downloadedPath,
-          mediaType: mime,
-          mediaWidth: mediaWidth,
-          mediaHeight: mediaHeight,
-          isFileUploadNotification: false,
-        );
-
-        sendEvent(MessageUpdatedEvent(message: msg.copyWith(isDownloading: false)));
-
-        if (notification.shouldShowNotification(msg.conversationJid) && job.shouldShowNotification) {
-          _log.finest('Creating notification with bigPicture $downloadedPath');
-          await notification.showNotification(msg, '');
-        }
-
-        final conv = (await GetIt.I.get<ConversationService>().getConversationByJid(job.conversationJid))!;
-        final sharedMedium = await GetIt.I.get<DatabaseService>().addSharedMediumFromData(
-          downloadedPath,
-          msg.timestamp,
-          conv.id,
-          mime: mime,
-        );
-        final newConv = conv.copyWith(
-          sharedMedia: List<SharedMedium>.from(conv.sharedMedia)..add(sharedMedium),
-        );
-        sendEvent(ConversationUpdatedEvent(conversation: newConv));
-      }
     } on dio.DioError catch(err) {
       // TODO(PapaTutuWawa): React if we received an error that is not related to the
       //                     connection.
-      _log.finest('Error: $err');
+      _log.finest('Failed to download: $err');
+      await _fileDownloadFailed(job, fileDownloadFailedError);
+      return;
+    }
+
+    if (!isRequestOkay(response.statusCode)) {
+      _log.warning('HTTP GET of ${job.location.url} returned ${response.statusCode}');
+      await _fileDownloadFailed(job, fileDownloadFailedError);
+      return;
+    } else {
+      var integrityCheckPassed = true;
+      final conv = (await GetIt.I.get<ConversationService>()
+          .getConversationByJid(job.conversationJid))!;
+      final decryptionKeysAvailable = job.location.key != null && job.location.iv != null;
+      if (decryptionKeysAvailable) {
+        // The file was downloaded and is now being decrypted
+        sendEvent(
+          ProgressEvent(
+            id: job.mId,
+          ),
+        );
+
+        try {
+          final result = await GetIt.I.get<CryptographyService>().decryptFile(
+            downloadPath,
+            downloadedPath,
+            encryptionTypeFromNamespace(job.location.encryptionScheme!),
+            job.location.key!,
+            job.location.iv!,
+            job.location.plaintextHashes ?? {},
+            job.location.ciphertextHashes ?? {},
+          );
+
+          if (!result.decryptionOkay) {
+            _log.warning('Failed to decrypt $downloadPath');
+            await _fileDownloadFailed(job, messageFailedToDecryptFile);
+            return;
+          }
+
+          integrityCheckPassed = result.plaintextOkay && result.ciphertextOkay;
+        } catch (ex) {
+          _log.warning('Decryption of $downloadPath ($downloadedPath) failed: $ex');
+          await _fileDownloadFailed(job, messageFailedToDecryptFile);
+          return;
+        }
+
+        unawaited(Directory(pathlib.dirname(downloadPath)).delete(recursive: true));
+      }
+
+      // Check the MIME type
+      final notification = GetIt.I.get<NotificationsService>();
+      final mime = job.mimeGuess ?? lookupMimeType(downloadedPath);
+
+      int? mediaWidth;
+      int? mediaHeight;
+      if (mime != null) {
+        if (mime.startsWith('image/')) {
+          MoxplatformPlugin.media.scanFile(downloadedPath);
+
+          // Find out the dimensions
+          // TODO(Unknown): Restrict to the library's supported file types
+          Size? size;
+          try {
+            size = ImageSizeGetter.getSize(FileInput(File(downloadedPath)));
+          } catch (ex) {
+            _log.warning('Failed to get image size for $downloadedPath: $ex');
+          }
+
+          mediaWidth = size?.width;
+          mediaHeight = size?.height;
+        } else if (mime.startsWith('video/')) {
+          // TODO(Unknown): Also figure out the thumbnail size here
+          MoxplatformPlugin.media.scanFile(downloadedPath);
+        } else if (mime.startsWith('audio/')) {
+          MoxplatformPlugin.media.scanFile(downloadedPath);
+        }
+      }
+
+      final msg = await GetIt.I.get<MessageService>().updateMessage(
+        job.mId,
+        mediaUrl: downloadedPath,
+        mediaType: mime,
+        mediaWidth: mediaWidth,
+        mediaHeight: mediaHeight,
+        mediaSize: File(downloadedPath).lengthSync(),
+        isFileUploadNotification: false,
+        warningType: integrityCheckPassed ?
+          null :
+          warningFileIntegrityCheckFailed,
+        errorType: conv.encrypted && !decryptionKeysAvailable ?
+          messageChatEncryptedButFileNot :
+          null,
+        isDownloading: false,
+      );
+
+      sendEvent(MessageUpdatedEvent(message: msg));
+
+      if (notification.shouldShowNotification(msg.conversationJid) && job.shouldShowNotification) {
+        _log.finest('Creating notification with bigPicture $downloadedPath');
+        await notification.showNotification(msg, '');
+      }
+
+      final sharedMedium = await GetIt.I.get<DatabaseService>().addSharedMediumFromData(
+        downloadedPath,
+        msg.timestamp,
+        conv.id,
+        mime: mime,
+      );
+      final newConv = conv.copyWith(
+        sharedMedia: List<SharedMedium>.from(conv.sharedMedia)..add(sharedMedium),
+      );
+      sendEvent(ConversationUpdatedEvent(conversation: newConv));
     }
 
     // Free the download resources for the next one
+    await _pickNextDownloadTask();
+  }
+
+  Future<void> _pickNextDownloadTask() async {
     if (GetIt.I.get<ConnectivityService>().currentState == ConnectivityResult.none) return;
-    await _uploadLock.synchronized(() async {
-      if (_uploadQueue.isNotEmpty) {
+
+    await _downloadLock.synchronized(() async {
+      if (_downloadQueue.isNotEmpty) {
         _currentDownloadJob = _downloadQueue.removeFirst();
         unawaited(_performFileDownload(_currentDownloadJob!));
       } else {

lib/service/httpfiletransfer/jobs.dart

@@ -1,15 +1,17 @@
 import 'package:meta/meta.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/service/httpfiletransfer/location.dart';
 import 'package:moxxyv2/shared/models/message.dart';
-import 'package:moxxyv2/xmpp/xeps/staging/extensible_file_thumbnails.dart';
 
 /// A job describing the download of a file.
 @immutable
 class FileUploadJob {
-
-  const FileUploadJob(this.recipients, this.path, this.mime, this.messageMap, this.thumbnails);
+  const FileUploadJob(this.recipients, this.path, this.mime, this.encryptMap, this.messageMap, this.thumbnails);
   final List<String> recipients;
   final String path;
   final String? mime;
+  // Recipient -> Should encrypt
+  final Map<String, bool> encryptMap;
   // Recipient -> Message
   final Map<String, Message> messageMap;
   final List<Thumbnail> thumbnails;
@@ -21,19 +23,25 @@ class FileUploadJob {
       path == other.path &&
       messageMap == other.messageMap &&
       mime == other.mime &&
-      thumbnails == other.thumbnails;
+      thumbnails == other.thumbnails &&
+      encryptMap == other.encryptMap;
   }
 
   @override
-  int get hashCode => path.hashCode ^ recipients.hashCode ^ messageMap.hashCode ^ mime.hashCode ^ thumbnails.hashCode;
+  int get hashCode => path.hashCode ^ recipients.hashCode ^ messageMap.hashCode ^ mime.hashCode ^ thumbnails.hashCode ^ encryptMap.hashCode;
 }
 
 /// A job describing the upload of a file.
 @immutable
 class FileDownloadJob {
-
-  const FileDownloadJob(this.url, this.mId, this.conversationJid, this.mimeGuess, {this.shouldShowNotification = true});
-  final String url;
+  const FileDownloadJob(
+    this.location,
+    this.mId,
+    this.conversationJid,
+    this.mimeGuess, {
+      this.shouldShowNotification = true,
+  });
+  final MediaFileLocation location;
   final int mId;
   final String conversationJid;
   final String? mimeGuess;
@@ -42,12 +50,13 @@ class FileDownloadJob {
   @override
   bool operator ==(Object other) {
     return other is FileDownloadJob &&
-      url == other.url &&
+      location == other.location &&
       mId == other.mId &&
       conversationJid == other.conversationJid &&
       mimeGuess == other.mimeGuess &&
       shouldShowNotification == other.shouldShowNotification;
   }
+
   @override
-  int get hashCode => url.hashCode ^ mId.hashCode ^ conversationJid.hashCode ^ mimeGuess.hashCode ^ shouldShowNotification.hashCode;
+  int get hashCode => location.hashCode ^ mId.hashCode ^ conversationJid.hashCode ^ mimeGuess.hashCode ^ shouldShowNotification.hashCode;
 }

lib/service/httpfiletransfer/location.dart

@@ -0,0 +1,49 @@
+import 'dart:convert';
+import 'package:meta/meta.dart';
+
+@immutable
+class MediaFileLocation {
+
+  const MediaFileLocation(
+    this.url,
+    this.filename,
+    this.encryptionScheme,
+    this.key,
+    this.iv,
+    this.plaintextHashes,
+    this.ciphertextHashes,
+  );
+  final String url;
+  final String filename;
+  final String? encryptionScheme;
+  final List<int>? key;
+  final List<int>? iv;
+  final Map<String, String>? plaintextHashes;
+  final Map<String, String>? ciphertextHashes;
+
+  String? get keyBase64 {
+    if (key != null) return base64Encode(key!);
+
+    return null;
+  }
+
+  String? get ivBase64 {
+    if (iv != null) return base64Encode(iv!);
+
+    return null;
+  }
+
+  @override
+  int get hashCode => url.hashCode ^ filename.hashCode ^ encryptionScheme.hashCode ^ key.hashCode ^ iv.hashCode ^ plaintextHashes.hashCode ^ ciphertextHashes.hashCode;
+
+  @override
+  bool operator==(Object other) {
+    // TODO(PapaTutuWawa): Compare the Maps
+    return other is MediaFileLocation &&
+           url == other.url &&
+           filename == other.filename &&
+           encryptionScheme == other.encryptionScheme &&
+           key == other.key &&
+           iv == other.iv;
+  }
+}

lib/service/language.dart

@@ -0,0 +1,5 @@
+/// A simple wrapper around storing the system's default language.
+class LanguageService {
+  LanguageService() : defaultLocale = 'en';
+  String defaultLocale;
+}

lib/service/message.dart

@@ -1,13 +1,12 @@
 import 'dart:collection';
-
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
+import 'package:moxlib/moxlib.dart';
 import 'package:moxxyv2/service/database/database.dart';
-import 'package:moxxyv2/shared/helpers.dart';
+import 'package:moxxyv2/service/not_specified.dart';
 import 'package:moxxyv2/shared/models/message.dart';
 
 class MessageService {
-
   MessageService() : _messageCache = HashMap(), _log = Logger('MessageService');
   final HashMap<String, List<Message>> _messageCache;
   final Logger _log;
@@ -36,8 +35,12 @@ class MessageService {
     bool isMedia,
     String sid,
     bool isFileUploadNotification,
+    bool encrypted,
     {
       String? srcUrl,
+      String? key,
+      String? iv,
+      String? encryptionScheme,
       String? mediaUrl,
       String? mediaType,
       String? thumbnailData,
@@ -46,6 +49,13 @@ class MessageService {
       String? originId,
       String? quoteId,
       String? filename,
+      int? errorType,
+      int? warningType,
+      Map<String, String>? plaintextHashes,
+      Map<String, String>? ciphertextHashes,
+      bool isDownloading = false,
+      bool isUploading = false,
+      int? mediaSize,
     }
   ) async {
     final msg = await GetIt.I.get<DatabaseService>().addMessageFromData(
@@ -56,7 +66,11 @@ class MessageService {
       isMedia,
       sid,
       isFileUploadNotification,
+      encrypted,
       srcUrl: srcUrl,
+      key: key,
+      iv: iv,
+      encryptionScheme: encryptionScheme,
       mediaUrl: mediaUrl,
       mediaType: mediaType,
       thumbnailData: thumbnailData,
@@ -65,6 +79,13 @@ class MessageService {
       originId: originId,
       quoteId: quoteId,
       filename: filename,
+      errorType: errorType,
+      warningType: warningType,
+      plaintextHashes: plaintextHashes,
+      ciphertextHashes: ciphertextHashes,
+      isUploading: isUploading,
+      isDownloading: isDownloading,
+      mediaSize: mediaSize,
     );
 
     // Only update the cache if the conversation already has been loaded. This prevents
@@ -86,39 +107,74 @@ class MessageService {
       (message) => message.sid == stanzaId,
     );
   }
-  
+
+  Future<Message?> getMessageById(String conversationJid, int id) async {
+    if (!_messageCache.containsKey(conversationJid)) {
+      await getMessagesForJid(conversationJid);
+    }
+
+    return firstWhereOrNull(
+      _messageCache[conversationJid]!,
+      (message) => message.id == id,
+    );
+  }
+
   /// Wrapper around [DatabaseService]'s updateMessage that updates the cache
   Future<Message> updateMessage(int id, {
-    String? mediaUrl,
-    String? mediaType,
+    Object? body = notSpecified,
+    Object? mediaUrl = notSpecified,
+    Object? mediaType = notSpecified,
+    bool? isMedia,
     bool? received,
     bool? displayed,
     bool? acked,
-    int? errorType,
+    Object? errorType = notSpecified,
+    Object? warningType = notSpecified,
     bool? isFileUploadNotification,
-    String? srcUrl,
-    int? mediaWidth,
-    int? mediaHeight,
+    Object? srcUrl = notSpecified,
+    Object? key = notSpecified,
+    Object? iv = notSpecified,
+    Object? encryptionScheme = notSpecified,
+    Object? mediaWidth = notSpecified,
+    Object? mediaHeight = notSpecified,
+    Object? mediaSize = notSpecified,
+    bool? isUploading,
+    bool? isDownloading,
+    Object? originId = notSpecified,
+    Object? sid = notSpecified,
+    bool? isRetracted,
   }) async {
     final newMessage = await GetIt.I.get<DatabaseService>().updateMessage(
       id,
+      body: body,
       mediaUrl: mediaUrl,
       mediaType: mediaType,
       received: received,
       displayed: displayed,
       acked: acked,
       errorType: errorType,
+      warningType: warningType,
       isFileUploadNotification: isFileUploadNotification,
       srcUrl: srcUrl,
+      key: key,
+      iv: iv,
+      encryptionScheme: encryptionScheme,
       mediaWidth: mediaWidth,
       mediaHeight: mediaHeight,
+      mediaSize: mediaSize,
+      isUploading: isUploading,
+      isDownloading: isDownloading,
+      originId: originId,
+      sid: sid,
+      isRetracted: isRetracted,
+      isMedia: isMedia,
     );
 
     if (_messageCache.containsKey(newMessage.conversationJid)) {
       _messageCache[newMessage.conversationJid] = _messageCache[newMessage.conversationJid]!.map((m) {
-          if (m.id == newMessage.id) return newMessage;
+        if (m.id == newMessage.id) return newMessage;
 
-          return m;
+        return m;
       }).toList();
     }
     

lib/service/moxxmpp/disco.dart

@@ -1,5 +1,4 @@
-import 'package:moxxyv2/xmpp/xeps/xep_0030/helpers.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0030/xep_0030.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 
 class MoxxyDiscoManager extends DiscoManager {
   @override

lib/service/moxxmpp/omemo.dart

@@ -0,0 +1,42 @@
+import 'package:get_it/get_it.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/service/conversation.dart';
+import 'package:moxxyv2/service/omemo/omemo.dart';
+import 'package:omemo_dart/omemo_dart.dart';
+
+class MoxxyOmemoManager extends OmemoManager {
+
+  MoxxyOmemoManager() : super();
+
+  @override
+  Future<OmemoSessionManager> getSessionManager() async {
+    final os = GetIt.I.get<OmemoService>();
+    await os.ensureInitialized();
+    return os.omemoState;
+  }
+
+  @override
+  Future<bool> shouldEncryptStanza(JID toJid, Stanza stanza) async {
+    // Never encrypt stanzas that contain PubSub elements
+    if (stanza.firstTag('pubsub', xmlns: pubsubXmlns) != null ||
+        stanza.firstTag('pubsub', xmlns: pubsubOwnerXmlns) != null) {
+      return false;
+    }
+
+    // Encrypt when the conversation is set to use OMEMO.
+    return GetIt.I.get<ConversationService>().shouldEncryptForConversation(toJid);
+  }
+}
+
+class MoxxyBTBVTrustManager extends BlindTrustBeforeVerificationTrustManager {
+  MoxxyBTBVTrustManager(
+    Map<RatchetMapKey, BTBVTrustState> trustCache,
+    Map<RatchetMapKey, bool> enablementCache,
+    Map<String, List<int>> devices,
+  ) : super(trustCache: trustCache, enablementCache: enablementCache, devices: devices);
+
+  @override
+  Future<void> commitState() async {
+    await GetIt.I.get<OmemoService>().commitTrustManager(await toJson());
+  }
+}

lib/service/moxxmpp/reconnect.dart

@@ -4,8 +4,8 @@ import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
 import 'package:meta/meta.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/connectivity.dart';
-import 'package:moxxyv2/xmpp/reconnect.dart';
 import 'package:synchronized/synchronized.dart';
 
 /// This class implements a reconnection policy that is connectivity aware with a random
@@ -13,10 +13,10 @@ import 'package:synchronized/synchronized.dart';
 /// connected. Otherwise, we idle until we have a connection again.
 class MoxxyReconnectionPolicy extends ReconnectionPolicy {
 
-  MoxxyReconnectionPolicy({ bool isTesting = false })
+  MoxxyReconnectionPolicy({ bool isTesting = false, this.maxBackoffTime })
   : _isTesting = isTesting,
     _timerLock = Lock(),
-    _log = Logger('MoxxyReconnectionPolicy'),
+    _log = Logger('MoxxyReconnectionPolicy'), 
     super();
   final Logger _log;
 
@@ -27,6 +27,9 @@ class MoxxyReconnectionPolicy extends ReconnectionPolicy {
 
   /// Just for testing purposes
   final bool _isTesting;
+
+  /// Maximum backoff time
+  final int? maxBackoffTime;
   
   /// To be called when the conectivity changes
   Future<void> onConnectivityChanged(bool regained, bool lost) async {
@@ -78,7 +81,18 @@ class MoxxyReconnectionPolicy extends ReconnectionPolicy {
   Future<void> _attemptReconnection(bool immediately) async {
     if (await testAndSetIsReconnecting()) {
       // Attempt reconnecting
-      final seconds = _isTesting ? 9999 : Random().nextInt(15);
+      int seconds;
+      if (_isTesting) {
+        seconds = 9999;
+      } else {
+        final r = Random().nextInt(15);
+        if (maxBackoffTime != null) {
+          seconds = min(maxBackoffTime!, r);
+        } else {
+          seconds = r;
+        }
+      }
+
       await _stopTimer();
       if (immediately) {
         _log.finest('Immediately attempting reconnection...');

lib/service/moxxmpp/roster.dart

@@ -1,8 +1,7 @@
 import 'dart:async';
-
 import 'package:get_it/get_it.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/xmpp.dart';
-import 'package:moxxyv2/xmpp/roster.dart';
 
 class MoxxyRosterManager extends RosterManager {
   @override

lib/service/moxxmpp/socket.dart

@@ -0,0 +1,19 @@
+import 'package:moxdns/moxdns.dart';
+import 'package:moxxmpp_socket_tcp/moxxmpp_socket_tcp.dart';
+
+class MoxxyTCPSocketWrapper extends TCPSocketWrapper {
+  MoxxyTCPSocketWrapper() : super(false);
+
+  @override
+  Future<List<MoxSrvRecord>> srvQuery(String domain, bool dnssec) async {
+    final records = await MoxdnsPlugin.srvQuery(domain, dnssec);
+    return records
+      .map((record) => MoxSrvRecord(
+        record.priority,
+        record.weight,
+        record.target,
+        record.port,
+      ),)
+      .toList();
+  }
+}

lib/service/moxxmpp/stream.dart

@@ -1,21 +1,18 @@
 import 'dart:async';
 import 'package:get_it/get_it.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/xmpp.dart';
-import 'package:moxxyv2/xmpp/namespaces.dart';
-import 'package:moxxyv2/xmpp/stanza.dart';
-import 'package:moxxyv2/xmpp/xeps/staging/file_upload_notification.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0198/xep_0198.dart';
 
 class MoxxyStreamManagementManager extends StreamManagementManager {
   @override
   bool shouldTriggerAckedEvent(Stanza stanza) {
-    // TODO(PapaTutuWawa): Once OMEMO is supported, add the encrypted element here
     return stanza.tag == 'message' &&
       stanza.id != null && (
         stanza.firstTag('body') != null ||
         stanza.firstTag('x', xmlns: oobDataXmlns) != null ||
         stanza.firstTag('file-sharing', xmlns: sfsXmlns) != null ||
-        stanza.firstTag('file-upload', xmlns: fileUploadNotificationXmlns) != null
+        stanza.firstTag('file-upload', xmlns: fileUploadNotificationXmlns) != null ||
+        stanza.firstTag('encrypted', xmlns: omemoXmlns) != null
       );
   }
   
@@ -30,7 +27,7 @@ class MoxxyStreamManagementManager extends StreamManagementManager {
   Future<void> loadState() async {
     final state = await GetIt.I.get<XmppService>().getXmppState();
     if (state.smState != null) {
-      setState(state.smState!);
+      await setState(state.smState!);
     }
   }
 }

lib/service/not_specified.dart

@@ -0,0 +1,4 @@
+class _NotSpecifiedValue { const _NotSpecifiedValue(); }
+
+/// A value used for indicating that a value is not specified.
+const notSpecified = _NotSpecifiedValue();

lib/service/notifications.dart

@@ -9,7 +9,6 @@ const maxNotificationId = 2147483647;
 
 // TODO(Unknown): Add resolution dependent drawables for the notification icon
 class NotificationsService {
-
   NotificationsService() : _log = Logger('NotificationsService');
   // ignore: unused_field
   final Logger _log;

lib/service/omemo/implementations.dart

@@ -0,0 +1,13 @@
+import 'package:moxxyv2/service/moxxmpp/omemo.dart';
+import 'package:omemo_dart/omemo_dart.dart';
+
+Future<OmemoSessionManager> generateNewIdentityImpl(String jid) async {
+  return OmemoSessionManager.generateNewIdentity(
+    jid,
+    MoxxyBTBVTrustManager(
+      <RatchetMapKey, BTBVTrustState>{},
+      <RatchetMapKey, bool>{},
+      <String, List<int>>{},
+    ),
+  );
+}

lib/service/omemo/omemo.dart

@@ -0,0 +1,305 @@
+import 'dart:async';
+import 'dart:collection';
+import 'package:flutter/foundation.dart';
+import 'package:get_it/get_it.dart';
+import 'package:hex/hex.dart';
+import 'package:logging/logging.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/service/database/database.dart';
+import 'package:moxxyv2/service/moxxmpp/omemo.dart';
+import 'package:moxxyv2/service/omemo/implementations.dart';
+import 'package:moxxyv2/shared/models/omemo_device.dart';
+import 'package:omemo_dart/omemo_dart.dart';
+import 'package:synchronized/synchronized.dart';
+
+class OmemoDoubleRatchetWrapper {
+
+  OmemoDoubleRatchetWrapper(this.ratchet, this.id, this.jid);
+  final OmemoDoubleRatchet ratchet;
+  final int id;
+  final String jid;
+}
+
+class OmemoService {
+
+  final Logger _log = Logger('OmemoService');
+
+  bool _initialized = false;
+  final Lock _lock = Lock();
+  final Queue<Completer<void>> _waitingForInitialization = Queue<Completer<void>>();
+
+  late OmemoSessionManager omemoState;
+  
+  Future<void> initializeIfNeeded(String jid) async {
+    final done = await _lock.synchronized(() => _initialized);
+    if (done) return;
+
+    final db = GetIt.I.get<DatabaseService>();
+    final device = await db.loadOmemoDevice(jid);
+    if (device == null) {
+      _log.info('No OMEMO marker found. Generating OMEMO identity...');
+      // Generate the identity in the background
+      omemoState = await compute(generateNewIdentityImpl, jid);
+
+      await commitDevice(await omemoState.getDevice());
+      await commitDeviceMap(<String, List<int>>{});
+      await commitTrustManager(await omemoState.trustManager.toJson());
+    } else {
+      _log.info('OMEMO marker found. Restoring OMEMO state...');
+      final ratchetMap = <RatchetMapKey, OmemoDoubleRatchet>{};
+      for (final ratchet in await GetIt.I.get<DatabaseService>().loadRatchets()) {
+        final key = RatchetMapKey(ratchet.jid, ratchet.id);
+        ratchetMap[key] = ratchet.ratchet;
+      }
+
+      final db = GetIt.I.get<DatabaseService>();
+      omemoState = OmemoSessionManager(
+        device,
+        await db.loadOmemoDeviceList(),
+        ratchetMap,
+        await loadTrustManager(),
+      );
+    }
+
+    omemoState.eventStream.listen((event) async {
+      if (event is RatchetModifiedEvent) {
+        await GetIt.I.get<DatabaseService>().saveRatchet(
+          OmemoDoubleRatchetWrapper(event.ratchet, event.deviceId, event.jid),
+        );
+      } else if (event is DeviceMapModifiedEvent) {
+        await commitDeviceMap(event.map);
+      } else if (event is DeviceModifiedEvent) {
+        await commitDevice(event.device);
+
+        // Publish it
+        await GetIt.I.get<XmppConnection>()
+          .getManagerById<OmemoManager>(omemoManager)!
+          .publishBundle(await event.device.toBundle());
+      }
+    });
+    
+    await _lock.synchronized(() {
+      _initialized = true;
+
+      for (final c in _waitingForInitialization) {
+        c.complete();
+      }
+      _waitingForInitialization.clear();
+    });
+  }
+
+  Future<OmemoDevice> regenerateDevice(String jid) async {
+    // Prevent access to the session manager as it is (mostly) guarded ensureInitialized
+    await _lock.synchronized(() {
+      _initialized = false;
+    });
+
+    _log.info('No OMEMO marker found. Generating OMEMO identity...');
+    final oldId = await omemoState.getDeviceId();
+
+    // Clear the database
+    await GetIt.I.get<DatabaseService>().emptyOmemoSessionTables();
+    
+    // Regenerate the identity in the background
+    omemoState = await compute(generateNewIdentityImpl, jid);
+
+    await commitDevice(await omemoState.getDevice());
+    await commitDeviceMap(<String, List<int>>{});
+    await commitTrustManager(await omemoState.trustManager.toJson());
+
+    // Remove the old device
+    final omemo = GetIt.I.get<XmppConnection>()
+      .getManagerById<OmemoManager>(omemoManager)!;
+    await omemo.deleteDevice(oldId);
+
+    // Publish the new one
+    await omemo.publishBundle(await omemoState.getDeviceBundle());
+    
+    // Allow access again
+    await _lock.synchronized(() {
+      _initialized = true;
+
+      for (final c in _waitingForInitialization) {
+        c.complete();
+      }
+      _waitingForInitialization.clear();
+    });
+
+    // Return the OmemoDevice
+    return OmemoDevice(
+      await getDeviceFingerprint(),
+      true,
+      true,
+      true,
+      await getDeviceId(),
+    );
+  }
+  
+  /// Ensures that the code following this *AWAITED* call can access every method
+  /// of the OmemoService.
+  Future<void> ensureInitialized() async {
+    final completer = await _lock.synchronized(() {
+      if (!_initialized) {
+        final c = Completer<void>();
+        _waitingForInitialization.add(c);
+        return c;
+      }
+
+      return null;
+    });
+
+    if (completer != null) {
+      await completer.future;
+    }
+  }
+  
+  Future<void> commitDeviceMap(Map<String, List<int>> deviceMap) async {
+    await GetIt.I.get<DatabaseService>().saveOmemoDeviceList(deviceMap);
+  }
+  
+  Future<void> commitDevice(Device device) async {
+    await GetIt.I.get<DatabaseService>().saveOmemoDevice(device);
+  }
+
+  /// Requests our device list and checks if the current device is in it. If not, then
+  /// it will be published.
+  Future<Object?> publishDeviceIfNeeded() async {
+    _log.finest('publishDeviceIfNeeded: Waiting for initialization...');
+    await ensureInitialized();
+    _log.finest('publishDeviceIfNeeded: Done');
+
+    final conn = GetIt.I.get<XmppConnection>();
+    final omemo = conn.getManagerById<OmemoManager>(omemoManager)!;
+    final dm = conn.getManagerById<DiscoManager>(discoManager)!;
+    final bareJid = conn.getConnectionSettings().jid.toBare();
+    final device = await omemoState.getDevice();
+
+    final bundlesRaw = await dm.discoItemsQuery(
+      bareJid.toString(),
+      node: omemoBundlesXmlns,
+    );
+    if (bundlesRaw.isType<DiscoError>()) {
+      await omemo.publishBundle(await device.toBundle());
+      return bundlesRaw.get<DiscoError>();
+    }
+
+    final bundleIds = bundlesRaw
+      .get<List<DiscoItem>>()
+      .where((item) => item.name != null)
+      .map((item) => int.parse(item.name!));
+    if (!bundleIds.contains(device.id)) {
+      final result = await omemo.publishBundle(await device.toBundle());
+      if (result.isType<OmemoError>()) return result.get<OmemoError>();
+      return null;
+    }
+    
+    final idsRaw = await omemo.getDeviceList(bareJid);
+    final ids = idsRaw.isType<OmemoError>() ? <int>[] : idsRaw.get<List<int>>();
+    if (!ids.contains(device.id)) {
+      final result = await omemo.publishBundle(await device.toBundle());
+      if (result.isType<OmemoError>()) return result.get<OmemoError>();
+      return null;
+    }
+
+    return null;
+  }
+
+  Future<List<OmemoDevice>> getOmemoKeysForJid(String jid) async {
+    await ensureInitialized();
+    final fingerprints = await omemoState.getHexFingerprintsForJid(jid);
+    final keys = List<OmemoDevice>.empty(growable: true);
+    for (final fp in fingerprints) {
+      keys.add(
+        OmemoDevice(
+          fp.fingerprint,
+          await omemoState.trustManager.isTrusted(jid, fp.deviceId),
+          // TODO(Unknown): Allow verifying OMEMO keys
+          false,
+          await omemoState.trustManager.isEnabled(jid, fp.deviceId),
+          fp.deviceId,
+        ),
+      );
+    }
+
+    return keys;
+  }
+
+  Future<void> commitTrustManager(Map<String, dynamic> json) async {
+
+    await GetIt.I.get<DatabaseService>().saveTrustCache(
+      json['trust']! as Map<String, int>,
+    );
+    await GetIt.I.get<DatabaseService>().saveTrustEnablementList(
+      json['enable']! as Map<String, bool>,
+    );
+    await GetIt.I.get<DatabaseService>().saveTrustDeviceList(
+      json['devices']! as Map<String, List<int>>,
+    );
+  }
+
+  Future<MoxxyBTBVTrustManager> loadTrustManager() async {
+    final db = GetIt.I.get<DatabaseService>();
+    return MoxxyBTBVTrustManager(
+      await db.loadTrustCache(),
+      await db.loadTrustEnablementList(),
+      await db.loadTrustDeviceList(),
+    );
+  }
+  
+  Future<void> setOmemoKeyEnabled(String jid, int deviceId, bool enabled) async {
+    await ensureInitialized();
+    await omemoState.trustManager.setEnabled(jid, deviceId, enabled);
+  }
+
+  Future<void> removeAllSessions(String jid) async {
+    await ensureInitialized();
+    await omemoState.removeAllRatchets(jid);
+  }
+
+  Future<int> getDeviceId() async {
+    await ensureInitialized();
+    return omemoState.getDeviceId();
+  }
+  
+  Future<String> getDeviceFingerprint() async {
+    return (await omemoState.getHexFingerprintForDevice()).fingerprint;
+  }
+
+  /// Returns a list of OmemoDevices for devices we have sessions with and other devices
+  /// published on [ownJid]'s devices PubSub node.
+  /// Note that the list is made so that the current device is excluded.
+  Future<List<OmemoDevice>> getOwnFingerprints(JID ownJid) async {
+    final conn = GetIt.I.get<XmppConnection>();
+    final ownId = await getDeviceId();
+    final keys = List<OmemoDevice>.from(
+      await getOmemoKeysForJid(ownJid.toString()),
+    );
+
+    // TODO(PapaTutuWawa): This should be cached in the database and only requested if
+    //                     it's not cached.
+    final allDevicesRaw = await conn.getManagerById<OmemoManager>(omemoManager)!
+      .retrieveDeviceBundles(ownJid);
+    if (allDevicesRaw.isType<List<OmemoBundle>>()) {
+      final allDevices = allDevicesRaw.get<List<OmemoBundle>>();
+
+      for (final device in allDevices) {
+        // All devices that are publishes that is not the current device
+        if (device.id == ownId) continue;
+        final curveIk = await device.ik.toCurve25519();
+        
+        keys.add(
+          OmemoDevice(
+            HEX.encode(await curveIk.getBytes()),
+            false,
+            false,
+            false,
+            device.id,
+            hasSessionWith: false,
+          ),
+        );
+      }
+    }
+
+    return keys;
+  }
+}

lib/service/roster.dart

@@ -1,21 +1,17 @@
 import 'dart:async';
 import 'dart:collection';
-
 import 'package:flutter/foundation.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
+import 'package:moxlib/moxlib.dart';
 import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/conversation.dart';
 import 'package:moxxyv2/service/database/database.dart';
 import 'package:moxxyv2/service/service.dart';
 import 'package:moxxyv2/shared/events.dart';
-import 'package:moxxyv2/shared/helpers.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/shared/models/roster.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/roster.dart';
-import 'package:moxxyv2/xmpp/types/error.dart';
 
 /// Closure which returns true if the jid of a [RosterItem] is equal to [jid].
 bool Function(RosterItem) _jidEqualsWrapper(String jid) {
@@ -343,7 +339,7 @@ class RosterService {
 
   Future<void> requestRoster() async {
     final roster = GetIt.I.get<XmppConnection>().getManagerById<RosterManager>(rosterManager)!;
-    MayFail<RosterRequestResult?> result;
+    Result<RosterRequestResult?, RosterError> result;
     if (roster.rosterVersioningAvailable()) {
       _log.fine('Stream supports roster versioning');
       result = await roster.requestRosterPushes();
@@ -353,17 +349,18 @@ class RosterService {
       result = await roster.requestRoster();
     }
 
-    if (result.isError()) {
+    if (result.isType<RosterError>()) {
       _log.warning('Failed to request roster');
       return;
     }
 
-    if (result.getValue() != null) {
+    final value = result.get<RosterRequestResult?>();
+    if (value != null) {
       final currentRoster = await getRoster();
       sendEvent(
         await processRosterDiff(
           currentRoster,
-          result.getValue()!.items,
+          value.items,
           false,
           addRosterItemFromData,
           updateRosterItem,

lib/service/service.dart

@@ -1,26 +1,33 @@
 import 'dart:async';
 import 'dart:io';
-
 import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
-import 'package:moxlib/awaitabledatasender.dart';
+import 'package:moxlib/moxlib.dart';
 import 'package:moxplatform/moxplatform.dart';
 import 'package:moxplatform_platform_interface/moxplatform_platform_interface.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/service/avatars.dart';
 import 'package:moxxyv2/service/blocking.dart';
 import 'package:moxxyv2/service/connectivity.dart';
 import 'package:moxxyv2/service/connectivity_watcher.dart';
 import 'package:moxxyv2/service/conversation.dart';
+import 'package:moxxyv2/service/cryptography/cryptography.dart';
 import 'package:moxxyv2/service/database/database.dart';
 import 'package:moxxyv2/service/events.dart';
 import 'package:moxxyv2/service/httpfiletransfer/httpfiletransfer.dart';
-import 'package:moxxyv2/service/managers/disco.dart';
-import 'package:moxxyv2/service/managers/roster.dart';
-import 'package:moxxyv2/service/managers/stream.dart';
+import 'package:moxxyv2/service/language.dart';
 import 'package:moxxyv2/service/message.dart';
+import 'package:moxxyv2/service/moxxmpp/disco.dart';
+import 'package:moxxyv2/service/moxxmpp/omemo.dart';
 import 'package:moxxyv2/service/moxxmpp/reconnect.dart';
+import 'package:moxxyv2/service/moxxmpp/roster.dart';
+import 'package:moxxyv2/service/moxxmpp/socket.dart';
+import 'package:moxxyv2/service/moxxmpp/stream.dart';
 import 'package:moxxyv2/service/notifications.dart';
+import 'package:moxxyv2/service/omemo/omemo.dart';
 import 'package:moxxyv2/service/preferences.dart';
 import 'package:moxxyv2/service/roster.dart';
 import 'package:moxxyv2/service/xmpp.dart';
@@ -29,33 +36,6 @@ import 'package:moxxyv2/shared/eventhandler.dart';
 import 'package:moxxyv2/shared/events.dart';
 import 'package:moxxyv2/shared/logging.dart';
 import 'package:moxxyv2/ui/events.dart' as ui_events;
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/message.dart';
-import 'package:moxxyv2/xmpp/negotiators/resource_binding.dart';
-import 'package:moxxyv2/xmpp/negotiators/sasl/plain.dart';
-import 'package:moxxyv2/xmpp/negotiators/sasl/scram.dart';
-import 'package:moxxyv2/xmpp/negotiators/starttls.dart';
-import 'package:moxxyv2/xmpp/ping.dart';
-import 'package:moxxyv2/xmpp/presence.dart';
-import 'package:moxxyv2/xmpp/roster.dart';
-import 'package:moxxyv2/xmpp/xeps/staging/file_upload_notification.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0054.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0060.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0066.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0084.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0184.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0191.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0198/negotiator.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0280.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0333.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0352.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0359.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0363.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0385.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0447.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0461.dart';
 
 Future<void> initializeServiceIfNeeded() async {
   final logger = GetIt.I.get<Logger>();
@@ -73,7 +53,9 @@ Future<void> initializeServiceIfNeeded() async {
     // ignore: cascade_invocations
     logger.info('Service is running. Sending pre start command');
     await handler.getDataSender().sendData(
-      PerformPreStartCommand(),
+      PerformPreStartCommand(
+        systemLocaleCode: WidgetsBinding.instance.platformDispatcher.locale.toLanguageTag(),
+      ),
       awaitable: false,
     );
   } else {
@@ -95,8 +77,7 @@ void sendEvent(BackgroundEvent event, { String? id }) {
 }
 
 void setupLogging() {
-  //Logger.root.level = kDebugMode ? Level.ALL : Level.INFO;
-  Logger.root.level = Level.ALL;
+  Logger.root.level = kDebugMode ? Level.ALL : Level.INFO;
   Logger.root.onRecord.listen((record) {
       final logMessageHeader = '[${record.level.name}] (${record.loggerName}) ${record.time}: ';
       var msg = record.message;
@@ -155,10 +136,11 @@ Future<void> entrypoint() async {
   // Register singletons
   GetIt.I.registerSingleton<Logger>(Logger('MoxxyService'));
   GetIt.I.registerSingleton<UDPLogger>(UDPLogger());
+  GetIt.I.registerSingleton<LanguageService>(LanguageService());
 
   setupLogging();
   setupBackgroundEventHandler();
-
+  
   // Initialize the database
   GetIt.I.registerSingleton<DatabaseService>(DatabaseService());
   await GetIt.I.get<DatabaseService>().initialize();
@@ -171,30 +153,39 @@ Future<void> entrypoint() async {
   GetIt.I.registerSingleton<RosterService>(RosterService());
   GetIt.I.registerSingleton<ConversationService>(ConversationService());
   GetIt.I.registerSingleton<MessageService>(MessageService());
+  GetIt.I.registerSingleton<OmemoService>(OmemoService());
+  GetIt.I.registerSingleton<CryptographyService>(CryptographyService());
   final xmpp = XmppService();
   GetIt.I.registerSingleton<XmppService>(xmpp);
 
   await GetIt.I.get<NotificationsService>().init();
+
+  if (!kDebugMode) {
+    final enableDebug = (await GetIt.I.get<PreferencesService>().getPreferences()).debugEnabled;
+    Logger.root.level = enableDebug ? Level.ALL : Level.INFO;
+  }
   
   // Init the UDPLogger
   await initUDPLogger();
-
+  
   GetIt.I.registerSingleton<MoxxyReconnectionPolicy>(MoxxyReconnectionPolicy());
-  final connection = XmppConnection(GetIt.I.get<MoxxyReconnectionPolicy>())
-    ..registerManagers([
+  final connection = XmppConnection(
+    GetIt.I.get<MoxxyReconnectionPolicy>(),
+    MoxxyTCPSocketWrapper(),
+  )..registerManagers([
       MoxxyStreamManagementManager(),
       MoxxyDiscoManager(),
       MoxxyRosterManager(),
+      MoxxyOmemoManager(),
       PingManager(),
       MessageManager(),
-      PresenceManager(),
+      PresenceManager('http://moxxy.im'),
       CSIManager(),
       CarbonsManager(),
       PubSubManager(),
       VCardManager(),
       UserAvatarManager(),
       StableIdManager(),
-      SIMSManager(),
       MessageDeliveryReceiptManager(),
       ChatMarkerManager(),
       OOBManager(),
@@ -204,6 +195,10 @@ Future<void> entrypoint() async {
       ChatStateManager(),
       HttpFileUploadManager(),
       FileUploadNotificationManager(),
+      EmeManager(),
+      CryptographicHashManager(),
+      DelayedDeliveryManager(),
+      MessageRetractionManager(),
     ])
     ..registerFeatureNegotiators([
       ResourceBindingNegotiator(),
@@ -211,11 +206,10 @@ Future<void> entrypoint() async {
       StreamManagementNegotiator(),
       CSINegotiator(),
       RosterFeatureNegotiator(),
-      // TODO(Unknown): This one may not work
-      //SaslScramNegotiator(10, '', '', ScramHashType.sha512),
-      SaslPlainNegotiator(),
+      SaslScramNegotiator(10, '', '', ScramHashType.sha512),
       SaslScramNegotiator(9, '', '', ScramHashType.sha256),
       SaslScramNegotiator(8, '', '', ScramHashType.sha1),
+      SaslPlainNegotiator(),
     ]);
     
   GetIt.I.registerSingleton<XmppConnection>(connection);
@@ -227,8 +221,16 @@ Future<void> entrypoint() async {
   
   final settings = await xmpp.getConnectionSettings();
 
+  // Ensure we can access translations here
+  // TODO(Unknown): This does *NOT* allow us to get the system's locale as we have no
+  //                window here.
+  WidgetsFlutterBinding.ensureInitialized();
+  LocaleSettings.useDeviceLocale();
+  
   GetIt.I.get<Logger>().finest('Got settings');
   if (settings != null) {
+    unawaited(GetIt.I.get<OmemoService>().initializeIfNeeded(settings.jid.toBare().toString()));
+
     // The title of the notification will be changed as soon as the connection state
     // of [XmppConnection] changes.
     await connection.getManagerById<MoxxyStreamManagementManager>(smManager)!.loadState();
@@ -236,7 +238,7 @@ Future<void> entrypoint() async {
   } else {
     GetIt.I.get<BackgroundService>().setNotification(
       'Moxxy',
-      'Idle',
+      t.notifications.permanent.idle,
     );
   }
 

lib/service/state.dart

@@ -1,5 +1,6 @@
+import 'dart:convert';
 import 'package:freezed_annotation/freezed_annotation.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0198/state.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 
 part 'state.freezed.dart';
 part 'state.g.dart';
@@ -29,6 +30,41 @@ class XmppState with _$XmppState {
       @Default(false) bool askedStoragePermission,
   }) = _XmppState;
 
+  const XmppState._();
+
   // JSON serialization
   factory XmppState.fromJson(Map<String, dynamic> json) => _$XmppStateFromJson(json);
+
+  factory XmppState.fromDatabaseTuples(Map<String, String?> tuples) {
+    final smStateString = tuples['smState'];
+    final isSmStateNotNull = smStateString != null && smStateString != 'null';
+    final json = <String, dynamic>{
+      'smState': isSmStateNotNull ?
+        jsonDecode(smStateString) as Map<String, dynamic> :
+        null,
+      'srid': tuples['srid'],
+      'resource': tuples['resource'],
+      'jid': tuples['jid'],
+      'displayName': tuples['displayName'],
+      'password': tuples['password'],
+      'lastRosterVersion': tuples['lastRosterVersion'],
+      'avatarUrl': tuples['avatarUrl'],
+      'avatarHash': tuples['avatarHash'],
+      'askedStoragePermission': tuples['askedStoragePermission'] == 'true',
+    };
+
+    return XmppState.fromJson(json);
+  }
+  
+  Map<String, String?> toDatabaseTuples() {
+    final json = toJson()
+      ..remove('smState')
+      ..remove('askedStoragePermission');
+      
+    return {
+      ...json.cast<String, String?>(),
+      'smState': jsonEncode(smState?.toJson()),
+      'askedStoragePermission': askedStoragePermission ? 'true' : 'false',
+    };
+  }
 }

lib/service/xmpp.dart

@@ -1,9 +1,7 @@
 import 'dart:async';
-import 'dart:convert';
 import 'dart:io';
 import 'dart:ui';
 import 'package:connectivity_plus/connectivity_plus.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:get_it/get_it.dart';
 import 'package:image_size_getter/file_input.dart';
 import 'package:image_size_getter/image_size_getter.dart' as image_size;
@@ -11,6 +9,8 @@ import 'package:logging/logging.dart';
 import 'package:mime/mime.dart';
 import 'package:moxlib/moxlib.dart';
 import 'package:moxplatform_platform_interface/moxplatform_platform_interface.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/service/avatars.dart';
 import 'package:moxxyv2/service/blocking.dart';
 import 'package:moxxyv2/service/connectivity.dart';
@@ -21,87 +21,24 @@ import 'package:moxxyv2/service/helpers.dart';
 import 'package:moxxyv2/service/httpfiletransfer/helpers.dart';
 import 'package:moxxyv2/service/httpfiletransfer/httpfiletransfer.dart';
 import 'package:moxxyv2/service/httpfiletransfer/jobs.dart';
+import 'package:moxxyv2/service/httpfiletransfer/location.dart';
 import 'package:moxxyv2/service/message.dart';
 import 'package:moxxyv2/service/notifications.dart';
+import 'package:moxxyv2/service/omemo/omemo.dart';
 import 'package:moxxyv2/service/preferences.dart';
 import 'package:moxxyv2/service/roster.dart';
 import 'package:moxxyv2/service/service.dart';
 import 'package:moxxyv2/service/state.dart';
+import 'package:moxxyv2/shared/error_types.dart';
 import 'package:moxxyv2/shared/eventhandler.dart';
 import 'package:moxxyv2/shared/events.dart';
 import 'package:moxxyv2/shared/helpers.dart';
-import 'package:moxxyv2/shared/migrator.dart';
 import 'package:moxxyv2/shared/models/media.dart';
 import 'package:moxxyv2/shared/models/message.dart';
-import 'package:moxxyv2/xmpp/connection.dart';
-import 'package:moxxyv2/xmpp/events.dart';
-import 'package:moxxyv2/xmpp/jid.dart';
-import 'package:moxxyv2/xmpp/managers/namespaces.dart';
-import 'package:moxxyv2/xmpp/message.dart';
-import 'package:moxxyv2/xmpp/namespaces.dart';
-import 'package:moxxyv2/xmpp/roster.dart';
-import 'package:moxxyv2/xmpp/settings.dart';
-import 'package:moxxyv2/xmpp/stanza.dart';
-import 'package:moxxyv2/xmpp/xeps/staging/extensible_file_thumbnails.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0184.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0333.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0446.dart';
 import 'package:path/path.dart' as pathlib;
 import 'package:permission_handler/permission_handler.dart';
 
-const currentXmppStateVersion = 1;
-const xmppStateKey = 'xmppState';
-const xmppStateVersionKey = 'xmppState_version';
-
-class _XmppStateMigrator extends Migrator<XmppState> {
-
-  _XmppStateMigrator() : super(currentXmppStateVersion, []);
-  final FlutterSecureStorage _storage = const FlutterSecureStorage(
-    // TODO(Unknown): Set other options
-    aOptions: AndroidOptions(encryptedSharedPreferences: true),
-  );
-
-  // TODO(Unknown): Deduplicate
-  Future<String?> _readKeyOrNull(String key) async {
-    if (await _storage.containsKey(key: key)) {
-      return _storage.read(key: key);
-    } else {
-      return null;
-    }
-  }
-
-  @override
-  Future<Map<String, dynamic>?> loadRawData() async {
-    final raw = await _readKeyOrNull(xmppStateKey);
-    if (raw != null) return json.decode(raw) as Map<String, dynamic>;
-
-    return null;
-  }
-
-  @override
-  Future<int?> loadVersion() async {
-    final raw = await _readKeyOrNull(xmppStateVersionKey);
-    if (raw != null) return int.parse(raw);
-
-    return null;
-  }
-
-  @override
-  XmppState fromData(Map<String, dynamic> data) => XmppState.fromJson(data);
-
-  @override
-  XmppState fromDefault() => XmppState();
-  
-  @override
-  Future<void> commit(int version, XmppState data) async {
-    await _storage.write(key: xmppStateVersionKey, value: currentXmppStateVersion.toString());
-    await _storage.write(key: xmppStateKey, value: json.encode(data.toJson()));
-  }
-}
-
 class XmppService {
-  
   XmppService() :
     _currentlyOpenedChatJid = '',
     _xmppConnectionSubscription = null,
@@ -109,7 +46,6 @@ class XmppService {
     _eventHandler = EventHandler(),
     _appOpen = true,
     _loginTriggeredFromUI = false,
-    _migrator = _XmppStateMigrator(),
     _log = Logger('XmppService') {
       _eventHandler.addMatchers([
         EventTypeMatcher<ConnectionStateChangedEvent>(_onConnectionStateChanged),
@@ -124,11 +60,11 @@ class XmppService {
         EventTypeMatcher<BlocklistBlockPushEvent>(_onBlocklistBlockPush),
         EventTypeMatcher<BlocklistUnblockPushEvent>(_onBlocklistUnblockPush),
         EventTypeMatcher<BlocklistUnblockAllPushEvent>(_onBlocklistUnblockAllPush),
+        EventTypeMatcher<StanzaSendingCancelledEvent>(_onStanzaSendingCancelled),
       ]);
     }
   final Logger _log;
   final EventHandler _eventHandler;
-  final _XmppStateMigrator _migrator;
   bool _loginTriggeredFromUI;
   bool _appOpen;
   String _currentlyOpenedChatJid;
@@ -138,14 +74,14 @@ class XmppService {
   Future<XmppState> getXmppState() async {
     if (_state != null) return _state!;
 
-    _state = await _migrator.load();
+    _state = await GetIt.I.get<DatabaseService>().getXmppState();
     return _state!;
   }
 
   /// A wrapper to modify the [XmppState] and commit it.
   Future<void> modifyXmppState(XmppState Function(XmppState) func) async {
     _state = func(_state!);
-    await _migrator.commit(currentXmppStateVersion, _state!);
+    await GetIt.I.get<DatabaseService>().saveXmppState(_state!);
   }
 
   /// Stores whether the app is open or not. Useful for notifications.
@@ -207,6 +143,7 @@ class XmppService {
     for (final recipient in recipients) {
       final sid = conn.generateId();
       final originId = conn.generateId();
+      final conversation = await cs.getConversationByJid(recipient);
       final message = await ms.addMessageFromData(
         body,
         timestamp,
@@ -215,9 +152,17 @@ class XmppService {
         false,
         sid,
         false,
+        conversation!.encrypted,
         originId: originId,
         quoteId: quotedMessage?.sid,
       );
+      final newConversation = await cs.updateConversation(
+        conversation.id,
+        lastMessageBody: body,
+        lastMessageId: message.id,
+        lastMessageRetracted: false,
+        lastChangeTimestamp: timestamp,
+      );
 
       // Using the same ID should be fine.
       sendEvent(
@@ -232,42 +177,76 @@ class XmppService {
           requestDeliveryReceipt: true,
           id: sid,
           originId: originId,
-          quoteBody: quotedMessage?.body,
+          quoteBody: createFallbackBodyForQuotedMessage(quotedMessage),
           quoteFrom: quotedMessage?.sender,
           quoteId: quotedMessage?.sid,
           chatState: chatState,
+          shouldEncrypt: newConversation.encrypted,
         ),
       );
 
-      final conversation = await cs.getConversationByJid(recipient);
-      final newConversation = await cs.updateConversation(
-        conversation!.id,
-        lastMessageBody: body,
-        lastChangeTimestamp: timestamp,
-      );
-
       sendEvent(
         ConversationUpdatedEvent(conversation: newConversation),
       );
     }
   }
 
-  String? _getMessageSrcUrl(MessageEvent event) {
+  MediaFileLocation? _getMessageSrcUrl(MessageEvent event) {
     if (event.sfs != null) {
-      return event.sfs!.url;
-    } else if (event.sims != null) {
-      return event.sims!.url;
+      final source = firstWhereOrNull(
+        event.sfs!.sources,
+        (StatelessFileSharingSource source) {
+          return source is StatelessFileSharingUrlSource || source is StatelessFileSharingEncryptedSource;
+        },
+      );
+
+      final name = event.sfs?.metadata.name;
+      if (source is StatelessFileSharingUrlSource) {
+        return MediaFileLocation(
+          source.url,
+          name != null ?
+            escapeFilename(name) :
+            filenameFromUrl(source.url),
+          null,
+          null,
+          null,
+          event.sfs?.metadata.hashes,
+          null,
+        );
+      } else {
+        final esource = source! as StatelessFileSharingEncryptedSource;
+        return MediaFileLocation(
+          esource.source.url,
+          name != null ?
+            escapeFilename(name) :
+            filenameFromUrl(esource.source.url),
+          esource.encryption.toNamespace(),
+          esource.key,
+          esource.iv,
+          event.sfs?.metadata.hashes,
+          esource.hashes,
+        );
+      }
     } else if (event.oob != null) {
-      return event.oob!.url;
+      return MediaFileLocation(
+        event.oob!.url!,
+        filenameFromUrl(event.oob!.url!),
+        null,
+        null,
+        null,
+        null,
+        null,
+      );
     }
 
     return null;
   }
 
   Future<void> _acknowledgeMessage(MessageEvent event) async {
-    final info = await GetIt.I.get<XmppConnection>().getDiscoManager().discoInfoQuery(event.fromJid.toString());
-    if (info == null) return;
+    final result = await GetIt.I.get<XmppConnection>().getDiscoManager().discoInfoQuery(event.fromJid.toString());
+    if (result.isType<DiscoError>()) return;
 
+    final info = result.get<DiscoInfo>();
     if (event.isMarkable && info.features.contains(chatMarkersXmlns)) {
       unawaited(
         GetIt.I.get<XmppConnection>().sendStanza(
@@ -354,6 +333,10 @@ class XmppService {
     final thumbnails = <String, List<Thumbnail>>{};
     // Path -> Dimensions
     final dimensions = <String, Size>{};
+    // Recipient -> Should encrypt
+    final encrypt = <String, bool>{};
+    // Recipient -> Last message Id
+    final lastMessageIds = <String, int>{};
 
     // Create the messages and shared media entries
     final conn = GetIt.I.get<XmppConnection>();
@@ -361,13 +344,20 @@ class XmppService {
       final pathMime = lookupMimeType(path);
 
       for (final recipient in recipients) {
+        final conversation = await cs.getConversationByJid(recipient);
+        encrypt[recipient] = conversation?.encrypted ?? prefs.enableOmemoByDefault;
+
         // TODO(Unknown): Do the same for videos
         if (pathMime != null && pathMime.startsWith('image/')) {
-          final imageSize = image_size.ImageSizeGetter.getSize(FileInput(File(path)));
-          dimensions[path] = Size(
-            imageSize.width.toDouble(),
-            imageSize.height.toDouble(),
-          );
+          try {
+            final imageSize = image_size.ImageSizeGetter.getSize(FileInput(File(path)));
+            dimensions[path] = Size(
+              imageSize.width.toDouble(),
+              imageSize.height.toDouble(),
+            );
+          } catch (ex) {
+            _log.warning('Failed to get image dimensions for $path');
+          }
         }
 
         final msg = await ms.addMessageFromData(
@@ -378,11 +368,14 @@ class XmppService {
           true,
           conn.generateId(),
           false,
+          encrypt[recipient]!,
           mediaUrl: path,
           mediaType: pathMime,
           originId: conn.generateId(),
           mediaWidth: dimensions[path]?.width.toInt(),
           mediaHeight: dimensions[path]?.height.toInt(),
+          filename: pathlib.basename(path),
+          isUploading: true,
         );
         if (messages.containsKey(path)) {
           messages[path]![recipient] = msg;
@@ -390,7 +383,11 @@ class XmppService {
           messages[path] = { recipient: msg };
         }
 
-        sendEvent(MessageAddedEvent(message: msg.copyWith(isUploading: true)));
+        if (path == paths.last) {
+          lastMessageIds[recipient] = msg.id;
+        }
+
+        sendEvent(MessageAddedEvent(message: msg));
       }
     }
 
@@ -405,7 +402,8 @@ class XmppService {
         // Update conversation
         final updatedConversation = await cs.updateConversation(
           conversation.id,
-          lastMessageBody: mimeTypeToConversationBody(lastFileMime),
+          lastMessageBody: mimeTypeToEmoji(lastFileMime),
+          lastMessageId: lastMessageIds[recipient],
           lastChangeTimestamp: DateTime.now().millisecondsSinceEpoch,
           open: true,
         );
@@ -427,13 +425,16 @@ class XmppService {
         final newConversation = await cs.addConversationFromData(
           // TODO(Unknown): Should we use the JID parser?
           rosterItem?.title ?? recipient.split('@').first,
-          mimeTypeToConversationBody(lastFileMime),
+          lastMessageIds[recipient]!,
+          false,
+          mimeTypeToEmoji(lastFileMime),
           rosterItem?.avatarUrl ?? '',
           recipient,
           0,
           DateTime.now().millisecondsSinceEpoch,
           true,
           prefs.defaultMuteState,
+          prefs.enableOmemoByDefault,
         );
 
         // Notify the UI
@@ -480,6 +481,7 @@ class XmppService {
               size: File(path).statSync().size,
               thumbnails: thumbnails[path] ?? [],
             ),
+            shouldEncrypt: encrypt[recipient]!,
           ),
         );
       }
@@ -489,6 +491,7 @@ class XmppService {
           recipients,
           path,
           pathMime,
+          encrypt,
           messages[path]!,
           thumbnails[path] ?? [],
         ),
@@ -497,34 +500,52 @@ class XmppService {
 
     _log.finest('File upload done');
   }
-  
-  Future<void> _onConnectionStateChanged(ConnectionStateChangedEvent event, { dynamic extra }) async {
-    switch (event.state) {
+
+  Future<void> _initializeOmemoService(String jid) async {
+    await GetIt.I.get<OmemoService>().initializeIfNeeded(jid);
+    final result = await GetIt.I.get<OmemoService>().publishDeviceIfNeeded();
+    if (result != null) {
+      // Notify the user that we could not publish the Omemo ~identity~ titty
+      await GetIt.I.get<NotificationsService>().showWarningNotification(
+        'Encryption',
+        t.errors.omemo.couldNotPublish,
+      );
+    }
+  }
+
+  /// Sets the permanent notification's title to the corresponding one for the
+  /// XmppConnection's state [state].
+  void setNotificationText(XmppConnectionState state) {
+    switch (state) {
       case XmppConnectionState.connected:
         GetIt.I.get<BackgroundService>().setNotification(
           'Moxxy',
-          'Ready to receive messages',
+          t.notifications.permanent.ready,
         );
       break;
       case XmppConnectionState.connecting:
         GetIt.I.get<BackgroundService>().setNotification(
           'Moxxy',
-          'Connecting...',
+          t.notifications.permanent.connecting,
         );
       break;
       case XmppConnectionState.notConnected:
         GetIt.I.get<BackgroundService>().setNotification(
           'Moxxy',
-          'Disconnected',
+          t.notifications.permanent.disconnect,
         );
       break;
       case XmppConnectionState.error:
         GetIt.I.get<BackgroundService>().setNotification(
           'Moxxy',
-          'Error',
+          t.notifications.permanent.error,
         );
       break;
     }
+  }
+  
+  Future<void> _onConnectionStateChanged(ConnectionStateChangedEvent event, { dynamic extra }) async {
+    setNotificationText(event.state);
 
     await GetIt.I.get<ConnectivityWatcherService>().onConnectionStateChanged(
       event.before, event.state,
@@ -541,6 +562,8 @@ class XmppService {
       ),);
 
       _log.finest('Connection connected. Is resumed? ${event.resumed}');
+      unawaited(_initializeOmemoService(settings.jid.toString()));
+
       if (!event.resumed) {
         // In section 5 of XEP-0198 it says that a client should not request the roster
         // in case of a stream resumption.
@@ -604,6 +627,8 @@ class XmppService {
       final bare = event.from.toBare();
       final conv = await cs.addConversationFromData(
         bare.toString().split('@')[0],
+        -1,
+        false,
         '',
         '', // TODO(Unknown): avatarUrl
         bare.toString(),
@@ -611,6 +636,7 @@ class XmppService {
         timestamp,
         true,
         prefs.defaultMuteState,
+        prefs.enableOmemoByDefault,
       );
 
       sendEvent(ConversationAddedEvent(conversation: conv));
@@ -672,14 +698,13 @@ class XmppService {
 
   /// Return true if [event] describes a message that we want to display.
   bool _isMessageEventMessage(MessageEvent event) {
-    return event.body.isNotEmpty || event.sfs != null || event.sims != null || event.fun != null;
+    return event.body.isNotEmpty || event.sfs != null || event.fun != null;
   }
 
   /// Extract the thumbnail data from a message, if existent.
   String? _getThumbnailData(MessageEvent event) {
     final thumbnails = firstNotNull([
         event.sfs?.metadata.thumbnails,
-        event.sims?.thumbnails,
         event.fun?.thumbnails,
     ]) ?? [];
     for (final i in thumbnails) {
@@ -694,9 +719,8 @@ class XmppService {
   /// Extract the mime guess from a message, if existent.
   String? _getMimeGuess(MessageEvent event) {
     return firstNotNull([
-        event.sfs?.metadata.mediaType,
-        event.sims?.mediaType,
-        event.fun?.mediaType,
+      event.sfs?.metadata.mediaType,
+      event.fun?.mediaType,
     ]);
   }
 
@@ -718,16 +742,68 @@ class XmppService {
   }
   
   /// Returns true if a file is embedded in [event]. If not, returns false.
-  /// [embeddedFileUrl] is the possible Url of the file. If no file is present, then
-  /// [embeddedFileUrl] is null.
-  bool _isFileEmbedded(MessageEvent event, String? embeddedFileUrl) {
+  /// [embeddedFile] is the possible source of the file. If no file is present, then
+  /// [embeddedFile] is null.
+  bool _isFileEmbedded(MessageEvent event, MediaFileLocation? embeddedFile) {
     // True if we determine a file to be embedded. Checks if the Url is using HTTPS and
     // that the message body and the OOB url are the same if the OOB url is not null.
-    return embeddedFileUrl != null
-      && Uri.parse(embeddedFileUrl).scheme == 'https'
+    return embeddedFile != null
+      && Uri.parse(embeddedFile.url).scheme == 'https'
       && implies(event.oob != null, event.body == event.oob?.url);
   }
 
+  /// Handle a message retraction given the MessageEvent [event].
+  Future<void> _handleMessageRetraction(MessageEvent event, String conversationJid) async {
+    final msg = await GetIt.I.get<DatabaseService>().getMessageByOriginId(
+      event.messageRetraction!.id,
+      conversationJid,
+    );
+
+    if (msg == null) {
+      _log.finest('Got message retraction for origin Id ${event.messageRetraction!.id}, but did not find the message');
+      return;
+    }
+
+    // Check if the retraction was sent by the original sender
+    if (JID.fromString(msg.sender).toBare().toString() != event.fromJid.toBare().toString()) {
+      _log.warning('Received invalid message retraction from ${event.fromJid.toBare().toString()} but its original sender is ${msg.sender}');
+      return;
+    }
+    
+    final retractedMessage = await GetIt.I.get<MessageService>().updateMessage(
+      msg.id,
+      isMedia: false,
+      mediaUrl: null,
+      mediaType: null,
+      warningType: null,
+      errorType: null,
+      srcUrl: null,
+      key: null,
+      iv: null,
+      encryptionScheme: null,
+      mediaWidth: null,
+      mediaHeight: null,
+      mediaSize: null,
+      isRetracted: true,
+    );
+    sendEvent(MessageUpdatedEvent(message: retractedMessage));
+
+    final cs = GetIt.I.get<ConversationService>();
+    final conversation = await cs.getConversationByJid(conversationJid);
+    if (conversation != null) {
+      if (conversation.lastMessageId == msg.id) {
+        final newConversation = await cs.updateConversation(
+          conversation.id,
+          lastMessageBody: '',
+          lastMessageRetracted: true,
+        );
+        sendEvent(ConversationUpdatedEvent(conversation: newConversation));
+      }
+    } else {
+      _log.warning('Failed to find conversation with conversationJid $conversationJid');
+    }
+  }
+  
   /// Returns true if a file should be automatically downloaded. If it should not, it
   /// returns false.
   /// [conversationJid] refers to the JID of the conversation the message was received in.
@@ -751,9 +827,14 @@ class XmppService {
       await _handleFileUploadNotificationReplacement(event, conversationJid);
       return;
     }
+
+    if (event.messageRetraction != null) {
+      await _handleMessageRetraction(event, conversationJid);
+      return;
+    }
     
     // Stop the processing here if the event does not describe a displayable message
-    if (!_isMessageEventMessage(event)) return;
+    if (!_isMessageEventMessage(event) && event.other['encryption_error'] == null) return;
 
     final state = await getXmppState();
     final prefs = await GetIt.I.get<PreferencesService>().getPreferences();
@@ -787,10 +868,10 @@ class XmppService {
     }
 
     // The Url of the file embedded in the message, if there is one.
-    final embeddedFileUrl = _getMessageSrcUrl(event);
+    final embeddedFile = _getMessageSrcUrl(event);
     // True if we determine a file to be embedded. Checks if the Url is using HTTPS and
     // that the message body and the OOB url are the same if the OOB url is not null.
-    final isFileEmbedded = _isFileEmbedded(event, embeddedFileUrl);
+    final isFileEmbedded = _isFileEmbedded(event, embeddedFile);
     // Indicates if we should auto-download the file, if a file is specified in the message
     final shouldDownload = await _shouldDownloadFile(conversationJid);
     // The thumbnail for the embedded file.
@@ -814,19 +895,25 @@ class XmppService {
       isFileEmbedded || event.fun != null,
       event.sid,
       event.fun != null,
-      srcUrl: embeddedFileUrl,
+      event.encrypted,
+      srcUrl: embeddedFile?.url,
+      filename: event.fun?.name ?? embeddedFile?.filename,
+      key: embeddedFile?.keyBase64,
+      iv: embeddedFile?.ivBase64,
+      encryptionScheme: embeddedFile?.encryptionScheme,
       mediaType: mimeGuess,
       thumbnailData: thumbnailData,
       mediaWidth: dimensions?.width.toInt(),
       mediaHeight: dimensions?.height.toInt(),
       quoteId: replyId,
-      filename: event.fun?.name,
+      originId: event.stanzaId.originId,
+      errorType: errorTypeFromException(event.other['encryption_error']),
     );
     
     // Attempt to auto-download the embedded file
     if (isFileEmbedded && shouldDownload) {
       final fts = GetIt.I.get<HttpFileTransferService>();
-      final metadata = await peekFile(embeddedFileUrl!);
+      final metadata = await peekFile(embeddedFile!.url);
 
       if (metadata.mime != null) mimeGuess = metadata.mime;
 
@@ -834,10 +921,13 @@ class XmppService {
       // "always download".
       if (prefs.maximumAutoDownloadSize == -1
         || (metadata.size != null && metadata.size! < prefs.maximumAutoDownloadSize * 1000000)) {
-        message = message.copyWith(isDownloading: true);
+        message = await ms.updateMessage(
+          message.id,
+          isDownloading: true,
+        );
         await fts.downloadFile(
           FileDownloadJob(
-            embeddedFileUrl,
+            embeddedFile,
             message.id,
             conversationJid,
             mimeGuess,
@@ -852,7 +942,7 @@ class XmppService {
     final cs = GetIt.I.get<ConversationService>();
     final ns = GetIt.I.get<NotificationsService>();
     // The body to be displayed in the conversations list
-    final conversationBody = isFileEmbedded || message.isFileUploadNotification ? mimeTypeToConversationBody(mimeGuess) : messageBody;
+    final conversationBody = isFileEmbedded || message.isFileUploadNotification ? mimeTypeToEmoji(mimeGuess) : messageBody;
     // Specifies if we have the conversation this message goes to opened
     final isConversationOpened = _currentlyOpenedChatJid == conversationJid;
     // The conversation we're about to modify, if it exists
@@ -867,6 +957,8 @@ class XmppService {
         conversation.id,
         lastMessageBody: conversationBody,
         lastChangeTimestamp: messageTimestamp,
+        lastMessageId: message.id,
+        lastMessageRetracted: false,
         // Do not increment the counter for messages we sent ourselves (via Carbons)
         // or if we have the chat currently opened
         unreadCounter: isConversationOpened || sent
@@ -890,6 +982,8 @@ class XmppService {
       // The conversation does not exist, so we must create it
       final newConversation = await cs.addConversationFromData(
         rosterItem?.title ?? conversationJid.split('@')[0],
+        message.id,
+        false,
         conversationBody,
         rosterItem?.avatarUrl ?? '',
         conversationJid,
@@ -897,6 +991,7 @@ class XmppService {
         messageTimestamp,
         true,
         prefs.defaultMuteState,
+        message.encrypted,
       );
 
       // Notify the UI
@@ -913,13 +1008,13 @@ class XmppService {
     }
 
     // Notify the UI of the message
-    sendEvent(
-      MessageAddedEvent(
-        message: message.copyWith(
-          isDownloading: event.fun != null,
-        ),
-      ),
-    );
+    if (message.isDownloading != (event.fun != null)) {
+      message = await ms.updateMessage(
+        message.id,
+        isDownloading: event.fun != null,
+      );
+    }
+    sendEvent(MessageAddedEvent(message: message));
   }
 
   Future<void> _handleFileUploadNotificationReplacement(MessageEvent event, String conversationJid) async {
@@ -945,31 +1040,36 @@ class XmppService {
     }
     
     // The Url of the file embedded in the message, if there is one.
-    final embeddedFileUrl = _getMessageSrcUrl(event);
+    final embeddedFile = _getMessageSrcUrl(event);
     // Is there even a file we can download?
-    final isFileEmbedded = _isFileEmbedded(event, embeddedFileUrl);
+    final isFileEmbedded = _isFileEmbedded(event, embeddedFile);
 
     if (isFileEmbedded) {
-      if (await _shouldDownloadFile(conversationJid)) {
-        message = message.copyWith(isDownloading: true);
+      final shouldDownload = await _shouldDownloadFile(conversationJid);
+      message = await ms.updateMessage(
+        message.id,
+        srcUrl: embeddedFile!.url,
+        key: embeddedFile.keyBase64,
+        iv: embeddedFile.ivBase64,
+        isFileUploadNotification: false,
+        isDownloading: shouldDownload,
+        sid: event.sid,
+        originId: event.stanzaId.originId,
+      );
+
+      // Tell the UI
+      sendEvent(MessageUpdatedEvent(message: message));
+
+      if (shouldDownload) {
         await GetIt.I.get<HttpFileTransferService>().downloadFile(
           FileDownloadJob(
-            embeddedFileUrl!,
+            embeddedFile,
             message.id,
             conversationJid,
             null,
             shouldShowNotification: false,
           ),
         );
-      } else {
-        message = await ms.updateMessage(
-          message.id,
-          srcUrl: embeddedFileUrl,
-          isFileUploadNotification: false,
-        );
-
-        // Tell the UI
-        sendEvent(MessageUpdatedEvent(message: message.copyWith(isDownloading: false)));
       }
     } else {
       _log.warning('Received a File Upload Notification replacement but the replacement contains no file!');
@@ -1013,4 +1113,70 @@ class XmppService {
   Future<void> _onBlocklistUnblockAllPush(BlocklistUnblockAllPushEvent event, { dynamic extra }) async {
     GetIt.I.get<BlocklistService>().onUnblockAllPush();
   }
+
+  Future<void> _onStanzaSendingCancelled(StanzaSendingCancelledEvent event, { dynamic extra }) async {
+    // We only really care about messages
+    if (event.data.stanza.tag != 'message') return;
+
+    final ms = GetIt.I.get<MessageService>();
+    final message = await ms.getMessageByStanzaId(
+      JID.fromString(event.data.stanza.to!).toBare().toString(),
+      event.data.stanza.id!,
+    );
+
+    if (message == null) {
+      _log.warning('Message could not be sent but we cannot find it in the database');
+      return;
+    }
+
+    final newMessage = await ms.updateMessage(
+      message.id,
+      errorType: errorTypeFromException(event.data.cancelReason),
+    );
+
+
+    // Tell the UI
+    sendEvent(MessageUpdatedEvent(message: newMessage));
+  }
+
+  /// Creates the fallback body for quoted messages.
+  /// If the quoted message contains text, it simply quotes the text.
+  /// If it contains a media file, the messageEmoji (usually an emoji
+  /// representing the mime type) is shown together with the file size
+  /// (from experience this information is sufficient, as most clients show
+  /// the file size, and including time information might be confusing and a
+  /// potential privacy issue).
+  /// This information is complemented either the srcUrl or – if unavailable –
+  /// by the body of the quoted message. For non-media messages, we always use
+  /// the body as fallback.
+  String? createFallbackBodyForQuotedMessage(Message? quotedMessage) {
+    if (quotedMessage == null) {
+      return null;
+    }
+
+    if (quotedMessage.isMedia) {
+      // Create formatted size string, if size is stored
+      String quoteMessageSize;
+      if (quotedMessage.mediaSize != null && quotedMessage.mediaSize! > 0) {
+        quoteMessageSize = '(${fileSizeToString(quotedMessage.mediaSize!)}) ';
+      } else {
+        quoteMessageSize = '';
+      }
+
+      // Create media url string, or use body if no srcUrl is stored
+      String quotedMediaUrl;
+      if (quotedMessage.srcUrl != null && quotedMessage.srcUrl!.isNotEmpty) {
+        quotedMediaUrl = '• ${quotedMessage.srcUrl!}';
+      } else if (quotedMessage.body.isNotEmpty){
+        quotedMediaUrl = '• ${quotedMessage.body}';
+      } else {
+        quotedMediaUrl = '';
+      }
+
+      // Concatenate emoji, size string, and media url and return
+      return '${quotedMessage.messageEmoji} $quoteMessageSize$quotedMediaUrl';
+    } else {
+      return quotedMessage.body;
+    }
+  }
 }

lib/shared/error_types.dart

@@ -1,2 +1,34 @@
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:omemo_dart/omemo_dart.dart';
+
 const noError = 0;
 const fileUploadFailedError = 1;
+const messageNotEncryptedForDevice = 2;
+const messageInvalidHMAC = 3;
+const messageNoDecryptionKey = 4;
+const messageInvalidAffixElements = 5;
+const messageInvalidNumber = 6;
+const messageFailedToEncrypt = 7;
+const messageFailedToDecryptFile = 8;
+const messageContactDoesNotSupportOmemo = 9;
+const messageChatEncryptedButFileNot = 10;
+const messageFailedToEncryptFile = 11;
+const fileDownloadFailedError = 12;
+
+int errorTypeFromException(dynamic exception) {
+  if (exception is NoDecryptionKeyException) {
+    return messageNoDecryptionKey;
+  } else if (exception is InvalidMessageHMACException) {
+    return messageInvalidHMAC;
+  } else if (exception is NotEncryptedForDeviceException) {
+    return messageNoDecryptionKey;
+  } else if (exception is InvalidAffixElementsException) {
+    return messageInvalidAffixElements;
+  } else if (exception is EncryptionFailedException) {
+    return messageFailedToEncrypt;
+  } else if (exception is OmemoNotSupportedForContactException) {
+    return messageContactDoesNotSupportOmemo;
+  }
+
+  return noError;
+}

lib/shared/eventhandler.dart

@@ -20,7 +20,7 @@ abstract class EventMatcher<E> {
 
 /// Matches an event according to if the event "is T".
 class EventTypeMatcher<T> extends EventMatcher<T> {
-  EventTypeMatcher(EventCallbackType<T> callback) : super(callback);
+  EventTypeMatcher(super.callback);
 
   @override
   bool matches(dynamic event) => event is T;
@@ -34,7 +34,6 @@ class EventTypeMatcher<T> extends EventMatcher<T> {
 /// A simple system for registering event handlers. Those handlers are checked whenever
 /// [run] is called.
 class EventHandler {
-
   EventHandler() : _matchers = List.empty(growable: true);
   final List<EventMatcher<dynamic>> _matchers;
 

lib/shared/events.dart

@@ -2,6 +2,7 @@ import 'package:moxlib/awaitabledatasender.dart';
 import 'package:moxplatform/moxplatform.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/shared/models/message.dart';
+import 'package:moxxyv2/shared/models/omemo_device.dart';
 import 'package:moxxyv2/shared/models/preferences.dart';
 import 'package:moxxyv2/shared/models/roster.dart';
 

lib/shared/helpers.dart

@@ -1,6 +1,6 @@
 import 'dart:core';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/models/message.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 import 'package:synchronized/synchronized.dart';
 
 /// Add a leading zero, if required, to ensure that an integer is rendered
@@ -15,23 +15,6 @@ String padInt(int i) {
   return i.toString();
 }
 
-/// A wrapper around List<T>.firstWhere that does not throw but instead just
-/// returns true if [test] returns true for an element or false if [test] never
-/// returned true.
-bool listContains<T>(List<T> list, bool Function(T element) test) {
-  return firstWhereOrNull<T>(list, test) != null;
-}
-
-/// A wrapper around [List<T>.firstWhere] that does not throw but instead just
-/// return null if [test] never returned true
-T? firstWhereOrNull<T>(List<T> list, bool Function(T element) test) {
-  try {
-    return list.firstWhere(test);
-  } catch(e) {
-    return null;
-  }
-}
-
 /// Format the timestamp of a conversation change into a nice string.
 /// timestamp and now are both in millisecondsSinceEpoch.
 /// Ensures that now >= timestamp
@@ -218,19 +201,19 @@ String? guessMimeTypeFromExtension(String ext) {
   return null;
 }
 
-/// Show a combinatio of an emoji and its file type
-String mimeTypeToConversationBody(String? mime) {
+/// Return an emoji for the MIME type [mime]. If [addTypeName] id true, then a human readable
+/// name for the MIME type will be appended.
+String mimeTypeToEmoji(String? mime, {bool addTypeName = true}) {
   if (mime != null) {
-    if (mime.startsWith('image/')) {
-      return '📷 Image';
-    } else if (mime.startsWith('video/')) {
-      return '🎞️ Video';
-    } else if (mime.startsWith('audio/')) {
-      return '🎵 Audio';
+    if (mime.startsWith('image')) {
+      return '🖼️${addTypeName ?  " ${t.messages.image}" : ""}';
+    } else if (mime.startsWith('audio')) {
+      return '🎙${addTypeName ?  " ${t.messages.audio}" : ""}';
+    } else if (mime.startsWith('video')) {
+      return '🎬${addTypeName ?  " ${t.messages.video}" : ""}';
     }
   }
-
-  return '📁 File';
+  return '📁${addTypeName ?  " ${t.messages.file}" : ""}';
 }
 
 /// Parse an Uri and return the "filename".
@@ -238,31 +221,16 @@ String filenameFromUrl(String url) {
   return Uri.parse(url).pathSegments.last;
 }
 
-ChatState chatStateFromString(String raw) {
-  switch(raw) {
-    case 'active': {
-      return ChatState.active;
-    }
-    case 'composing': {
-      return ChatState.composing;
-    } 
-    case 'paused': {
-      return ChatState.paused;
-    }
-    case 'inactive': {
-      return ChatState.inactive;
-    }
-    case 'gone': {
-      return ChatState.gone;
-    }
-    default: {
-      return ChatState.gone;
-    }
-  }
+/// Attempts to escape [filename] such that it cannot be expanded into another path, i.e.
+/// make "../" not dangerous.
+String escapeFilename(String filename) {
+  return filename
+    .replaceAll('/', '%2F')
+    // ignore: use_raw_strings
+    .replaceAll('\\', '%5C')
+    .replaceAll('../', '..%2F');
 }
 
-String chatStateToString(ChatState state) => state.toString().split('.').last;
-
 /// Return a version of the filename [filename] with [suffix] attached to the file's
 /// name while keeping the extension in [filename] intact.
 String filenameWithSuffix(String filename, String suffix) {
@@ -309,3 +277,16 @@ bool isSent(Message message, String jid) {
   // TODO(PapaTutuWawa): Does this work?
   return message.sender.split('/').first == jid.split('/').first;
 }
+
+/// Convert the file size [size] in bytes to a human readable string. This is what
+/// Conversations does.
+String fileSizeToString(int size) {
+  // See https://github.com/iNPUTmice/Conversations/blob/d435c1f2aef1454141d4f5099224b5a03d579dba/src/main/java/eu/siacs/conversations/utils/UIHelper.java#L605
+  if (size > (1.5 * 1024 * 1024)) {
+    return '${(size * 1.0 / (1024 * 1024)).round()} MiB';
+  } else if (size >= 1024) {
+    return '${(size * 1.0 / 1024).round()} KiB';
+  } else {
+    return '$size B';
+  }
+}

lib/shared/migrator.dart

@@ -1,57 +0,0 @@
-class Migration<T> {
-
-  Migration(this.version, this.migrationFunction);
-  final int version;
-  /// Return a version that is upgraded to the newest version.
-  final T Function(Map<String, dynamic>) migrationFunction;
-
-  bool canMigrate(int version) => version <= this.version;  
-}
-
-abstract class Migrator<T> {
-
-  Migrator(this.latestVersion, this.migrations) {
-    migrations.sort((a, b) => -1 * a.version.compareTo(b.version));
-  }
-  final int latestVersion;
-  final List<Migration<T>> migrations;
-
-  /// Override: Return the raw data or null if not set yet.
-  Future<Map<String, dynamic>?> loadRawData();
-
-  /// Override: Return the version or null if not set yet.
-  Future<int?> loadVersion();
-  
-  /// Override: Return [T] from [data] if the data is already at the newest version.
-  T fromData(Map<String, dynamic> data);
-
-  /// Override: If no data is available
-  T fromDefault();
-
-  /// Override: Commit the latest version and data back to the store.
-  Future<void> commit(int version, T data);
-  
-  Future<T> load() async {
-    final version = await loadVersion();
-    final data = await loadRawData();
-    if (version == null || data == null) {
-      final ret = fromDefault();
-      await commit(latestVersion, ret);
-      return ret;
-    }
-    
-    if (version == latestVersion) return fromData(data);
-
-    for (final migration in migrations) {
-      if (migration.canMigrate(version)) {
-        final ret = migration.migrationFunction(data);
-        await commit(latestVersion, ret);
-        return ret;
-      }
-    }
-
-    final ret = fromDefault();
-    await commit(latestVersion, ret);
-    return ret;
-  }
-}

lib/shared/models/conversation.dart

@@ -1,8 +1,7 @@
 import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/service/database/helpers.dart';
-import 'package:moxxyv2/shared/helpers.dart';
 import 'package:moxxyv2/shared/models/media.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 
 part 'conversation.freezed.dart';
 part 'conversation.g.dart';
@@ -23,6 +22,9 @@ class ConversationChatStateConverter implements JsonConverter<ChatState, Map<Str
 class Conversation with _$Conversation {
   factory Conversation(
     String title,
+    // NOTE: The internal database Id of the message
+    int lastMessageId,
+    bool lastMessageRetracted,
     String lastMessageBody,
     String avatarUrl,
     String jid,
@@ -39,6 +41,8 @@ class Conversation with _$Conversation {
     String subscription,
     // Whether the chat is muted (true = muted, false = not muted)
     bool muted,
+    // Whether the conversation is encrypted or not (true = encrypted, false = unencrypted)
+    bool encrypted,
     // The current chat state
     @ConversationChatStateConverter() ChatState chatState,
   ) = _Conversation;
@@ -56,7 +60,9 @@ class Conversation with _$Conversation {
       'sharedMedia': sharedMedia,
       'inRoster': inRoster,
       'subscription': subscription,
+      'encrypted': intToBool(json['encrypted']! as int),
       'chatState': const ConversationChatStateConverter().toJson(ChatState.gone),
+      'lastMessageRetracted': intToBool(json['lastMessageRetracted']! as int)
     });
   }
   
@@ -72,6 +78,8 @@ class Conversation with _$Conversation {
       ...map,
       'open': boolToInt(open),
       'muted': boolToInt(muted),
+      'encrypted': boolToInt(encrypted),
+      'lastMessageRetracted': boolToInt(lastMessageRetracted),
     };
   }
 }

lib/shared/models/message.dart

@@ -1,9 +1,25 @@
+import 'dart:convert';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:moxxyv2/service/database/helpers.dart';
+import 'package:moxxyv2/shared/error_types.dart';
+import 'package:moxxyv2/shared/helpers.dart';
+import 'package:moxxyv2/shared/warning_types.dart';
 
 part 'message.freezed.dart';
 part 'message.g.dart';
 
+Map<String, String>? _optionalJsonDecode(String? data) {
+  if (data == null) return null;
+
+  return jsonDecode(data) as Map<String, String>;
+}
+
+String? _optionalJsonEncode(Map<String, String>? data) {
+  if (data == null) return null;
+
+  return jsonEncode(data);
+}
+
 @freezed
 class Message with _$Message {
   // NOTE: id is the database id of the message
@@ -19,8 +35,10 @@ class Message with _$Message {
     String conversationJid,
     bool isMedia,
     bool isFileUploadNotification,
+    bool encrypted,
     {
       int? errorType,
+      int? warningType,
       String? mediaUrl,
       @Default(false) bool isDownloading,
       @Default(false) bool isUploading,
@@ -29,17 +47,24 @@ class Message with _$Message {
       int? mediaWidth,
       int? mediaHeight,
       String? srcUrl,
+      String? key,
+      String? iv,
+      String? encryptionScheme,
       @Default(false) bool received,
       @Default(false) bool displayed,
       @Default(false) bool acked,
+      @Default(false) bool isRetracted,
       String? originId,
       Message? quotes,
       String? filename,
+      Map<String, String>? plaintextHashes,
+      Map<String, String>? ciphertextHashes,
+      int? mediaSize,
     }
   ) = _Message;
 
   const Message._();
-  
+
   /// JSON
   factory Message.fromJson(Map<String, dynamic> json) => _$MessageFromJson(json);
 
@@ -51,15 +76,19 @@ class Message with _$Message {
       'acked': intToBool(json['acked']! as int),
       'isMedia': intToBool(json['isMedia']! as int),
       'isFileUploadNotification': intToBool(json['isFileUploadNotification']! as int),
+      'encrypted': intToBool(json['encrypted']! as int),
+      'plaintextHashes': _optionalJsonDecode(json['plaintextHashes'] as String?),
+      'ciphertextHashes': _optionalJsonDecode(json['ciphertextHashes'] as String?),
+      'isDownloading': intToBool(json['isDownloading']! as int),
+      'isUploading': intToBool(json['isUploading']! as int),
+      'isRetracted': intToBool(json['isRetracted']! as int),
     }).copyWith(quotes: quotes);
   }
   
-  Map<String, dynamic> toDatabaseJson(int? quoteId) {
+  Map<String, dynamic> toDatabaseJson() {
     final map = toJson()
       ..remove('id')
-      ..remove('quotes')
-      ..remove('isDownloading')
-      ..remove('isUploading');
+      ..remove('quotes');
 
     return {
       ...map,
@@ -68,7 +97,49 @@ class Message with _$Message {
       'received': boolToInt(received),
       'displayed': boolToInt(displayed),
       'acked': boolToInt(acked),
-      'quote_id': quoteId,
+      'encrypted': boolToInt(encrypted),
+      // NOTE: Message.quote_id is a foreign-key
+      'quote_id': quotes?.id,
+      'plaintextHashes': _optionalJsonEncode(plaintextHashes),
+      'ciphertextHashes': _optionalJsonEncode(ciphertextHashes),
+      'isDownloading': boolToInt(isDownloading),
+      'isUploading': boolToInt(isUploading),
+      'isRetracted': boolToInt(isRetracted),
     };
   }
+
+  /// Returns true if the message is an error. If not, then returns false.
+  bool isError() {
+    return errorType != null && errorType != noError;
+  }
+
+  /// Returns true if the message is a warning. If not, then returns false.
+  bool isWarning() {
+    return warningType != null && warningType != noWarning;
+  }
+
+  /// Returns a representative emoji for a message. Its primary purpose is
+  /// to provide a universal fallback for quoted media messages.
+  String get messageEmoji {
+    return mimeTypeToEmoji(mediaType, addTypeName: false);
+  }
+
+  /// Returns true if the message can be quoted. False if not.
+  bool get isQuotable => !isError() && !isRetracted && !isFileUploadNotification && !isUploading && !isDownloading;
+
+  /// Returns true if the message can be retracted. False if not.
+  /// [sentBySelf] asks whether or not the message was sent by us (the current Jid).
+  bool canRetract(bool sentBySelf) {
+    return originId != null && sentBySelf && !isFileUploadNotification && !isUploading && !isDownloading;
+  }
+
+  /// Returns true if the message can be edited. False if not.
+  /// [sentBySelf] asks whether or not the message was sent by us (the current Jid).
+  bool canEdit(bool sentBySelf) {
+    return sentBySelf && !isMedia && !isFileUploadNotification && !isUploading && !isDownloading;
+  }
+
+  /// Returns true if the message can open the selection menu by longpressing. False if
+  /// not.
+  bool get isLongpressable => !isRetracted;
 }

lib/shared/models/omemo_device.dart

@@ -0,0 +1,22 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'omemo_device.freezed.dart';
+part 'omemo_device.g.dart';
+
+/// This model is just for communication between UI and the backend.
+@freezed
+class OmemoDevice with _$OmemoDevice {
+  factory OmemoDevice(
+    String fingerprint,
+    bool trusted,
+    bool verified,
+    bool enabled,
+    int deviceId,
+    {
+      @Default(true) bool hasSessionWith, 
+    }
+  ) = _OmemoDevice;
+
+  /// JSON
+  factory OmemoDevice.fromJson(Map<String, dynamic> json) => _$OmemoDeviceFromJson(json);
+}

lib/shared/models/preferences.dart

@@ -3,29 +3,31 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 part 'preferences.freezed.dart';
 part 'preferences.g.dart';
 
-// TODO(Unknown): Move into the models directory
-
 @freezed
 class PreferencesState with _$PreferencesState {
   factory PreferencesState({
-      @Default(true) bool sendChatMarkers,
-      @Default(true) bool sendChatStates,
-      @Default(true) bool showSubscriptionRequests,
-      @Default(true) bool autoDownloadWifi,
-      @Default(false) bool autoDownloadMobile,
-      @Default(15) int maximumAutoDownloadSize,
-      @Default('') String backgroundPath,
-      @Default(true) bool isAvatarPublic,
-      @Default(false) bool autoAcceptSubscriptionRequests,
-      @Default(false) bool debugEnabled,
-      @Default('') String debugPassphrase,
-      @Default('') String debugIp,
-      @Default(-1) int debugPort,
-      @Default('') String twitterRedirect,
-      @Default('') String youtubeRedirect,
-      @Default(false) bool enableTwitterRedirect,
-      @Default(false) bool enableYoutubeRedirect,
-      @Default(false) bool defaultMuteState,
+    @Default(true) bool sendChatMarkers,
+    @Default(true) bool sendChatStates,
+    @Default(true) bool showSubscriptionRequests,
+    @Default(true) bool autoDownloadWifi,
+    @Default(false) bool autoDownloadMobile,
+    @Default(15) int maximumAutoDownloadSize,
+    @Default('') String backgroundPath,
+    @Default(true) bool isAvatarPublic,
+    @Default(false) bool autoAcceptSubscriptionRequests,
+    @Default(false) bool debugEnabled,
+    @Default('') String debugPassphrase,
+    @Default('') String debugIp,
+    @Default(-1) int debugPort,
+    @Default('') String twitterRedirect,
+    @Default('') String youtubeRedirect,
+    @Default(false) bool enableTwitterRedirect,
+    @Default(false) bool enableYoutubeRedirect,
+    @Default(false) bool defaultMuteState,
+    @Default(false) bool enableOmemoByDefault,
+    // NOTE: A value of 'default' means that the system's configured language should
+    //       be used
+    @Default('default') String languageLocaleCode,
   }) = _PreferencesState;
   
   // JSON serialization

lib/shared/warning_types.dart

@@ -0,0 +1,15 @@
+import 'package:moxxyv2/i18n/strings.g.dart';
+
+const noWarning = 0;
+const warningFileIntegrityCheckFailed = 1;
+
+String warningToTranslatableString(int warning) {
+  assert(warning != noWarning, 'Calling warningToTranslatableString with noWarning makes no sense');
+
+  switch (warning) {
+    case warningFileIntegrityCheckFailed: return t.warnings.message.integrityCheckFailed;
+  }
+
+  assert(false, 'Invalid warning code $warning used');
+  return '';
+}

lib/ui/bloc/conversation_bloc.dart

@@ -4,10 +4,11 @@ import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:get_it/get_it.dart';
+import 'package:moxlib/moxlib.dart';
 import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/shared/commands.dart';
 import 'package:moxxyv2/shared/events.dart' as events;
-import 'package:moxxyv2/shared/helpers.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/shared/models/message.dart';
 import 'package:moxxyv2/ui/bloc/conversations_bloc.dart';
@@ -15,7 +16,6 @@ import 'package:moxxyv2/ui/bloc/navigation_bloc.dart';
 import 'package:moxxyv2/ui/bloc/sendfiles_bloc.dart';
 import 'package:moxxyv2/ui/bloc/sharedmedia_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 
 part 'conversation_bloc.freezed.dart';
 part 'conversation_event.dart';
@@ -45,6 +45,8 @@ class ConversationBloc extends Bloc<ConversationEvent, ConversationState> {
     on<FilePickerRequestedEvent>(_onFilePickerRequested);
     on<EmojiPickerToggledEvent>(_onEmojiPickerToggled);
     on<OwnJidReceivedEvent>(_onOwnJidReceived);
+    on<OmemoSetEvent>(_onOmemoSet);
+    on<MessageRetractedEvent>(_onMessageRetracted);
   }
   /// The current chat state with the conversation partner
   ChatState _currentChatState;
@@ -326,4 +328,29 @@ class ConversationBloc extends Bloc<ConversationEvent, ConversationState> {
   Future<void> _onOwnJidReceived(OwnJidReceivedEvent event, Emitter<ConversationState> emit) async {
     emit(state.copyWith(jid: event.jid));
   }
+
+  Future<void> _onOmemoSet(OmemoSetEvent event, Emitter<ConversationState> emit) async {
+    emit(
+      state.copyWith(
+        conversation: state.conversation!.copyWith(
+          encrypted: event.enabled,
+        ),
+      ),
+    );
+
+    await MoxplatformPlugin.handler.getDataSender().sendData(
+      SetOmemoEnabledCommand(enabled: event.enabled, jid: state.conversation!.jid),
+      awaitable: false,
+    );
+  }
+
+  Future<void> _onMessageRetracted(MessageRetractedEvent event, Emitter<ConversationState> emit) async {
+    await MoxplatformPlugin.handler.getDataSender().sendData(
+      RetractMessageComment(
+        originId: event.id,
+        conversationJid: state.conversation!.jid,
+      ),
+      awaitable: false,
+    );
+  }
 }

lib/ui/bloc/conversation_event.dart

@@ -119,3 +119,15 @@ class OwnJidReceivedEvent extends ConversationEvent {
   OwnJidReceivedEvent(this.jid);
   final String jid;
 }
+
+/// Triggered when we enable or disable Omemo in the chat
+class OmemoSetEvent extends ConversationEvent {
+  OmemoSetEvent(this.enabled);
+  final bool enabled;
+}
+
+/// Triggered when a message should be retracted
+class MessageRetractedEvent extends ConversationEvent {
+  MessageRetractedEvent(this.id);
+  final String id;
+}

lib/ui/bloc/conversations_bloc.dart

@@ -49,9 +49,9 @@ class ConversationsBloc extends Bloc<ConversationsEvent, ConversationsState> {
     emit(
       state.copyWith(
         conversations: List.from(state.conversations.map((c) {
-            if (c.jid == event.conversation.jid) return event.conversation;
+          if (c.jid == event.conversation.jid) return event.conversation;
 
-            return c;
+          return c;
         }).toList()..sort(compareConversation),),
       ),
     );

lib/ui/bloc/devices_bloc.dart

@@ -0,0 +1,69 @@
+import 'package:bloc/bloc.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:get_it/get_it.dart';
+import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxyv2/shared/commands.dart';
+import 'package:moxxyv2/shared/events.dart';
+import 'package:moxxyv2/shared/models/omemo_device.dart';
+import 'package:moxxyv2/ui/bloc/navigation_bloc.dart';
+import 'package:moxxyv2/ui/constants.dart';
+
+part 'devices_bloc.freezed.dart';
+part 'devices_event.dart';
+part 'devices_state.dart';
+
+class DevicesBloc extends Bloc<DevicesEvent, DevicesState> {
+
+  DevicesBloc() : super(DevicesState()) {
+    on<DevicesRequestedEvent>(_onRequested);
+    on<DeviceEnabledSetEvent>(_onDeviceEnabledSet);
+    on<SessionsRecreatedEvent>(_onSessionsRecreated);
+  }
+
+  Future<void> _onRequested(DevicesRequestedEvent event, Emitter<DevicesState> emit) async {
+    emit(state.copyWith(working: true, jid: event.jid));
+
+    GetIt.I.get<NavigationBloc>().add(
+      PushedNamedEvent(
+        const NavigationDestination(devicesRoute),
+      ),
+    );
+
+    // ignore: cast_nullable_to_non_nullable
+    final result = await MoxplatformPlugin.handler.getDataSender().sendData(
+      GetConversationOmemoFingerprintsCommand(
+        jid: event.jid,
+      ),
+    ) as GetConversationOmemoFingerprintsResult;
+    
+    emit(
+      state.copyWith(
+        working: false,
+        devices: result.fingerprints,
+      ),
+    );
+  }
+
+  Future<void> _onDeviceEnabledSet(DeviceEnabledSetEvent event, Emitter<DevicesState> emit) async {
+    // ignore: cast_nullable_to_non_nullable
+    final result = await MoxplatformPlugin.handler.getDataSender().sendData(
+      SetOmemoDeviceEnabledCommand(
+        jid: state.jid,
+        deviceId: event.deviceId,
+        enabled: event.enabled,
+      ),
+    ) as GetConversationOmemoFingerprintsResult;
+    emit(state.copyWith(devices: result.fingerprints));  
+  }
+
+  Future<void> _onSessionsRecreated(SessionsRecreatedEvent event, Emitter<DevicesState> emit) async {
+    // ignore: cast_nullable_to_non_nullable
+    await MoxplatformPlugin.handler.getDataSender().sendData(
+      RecreateSessionsCommand(jid: state.jid),
+      awaitable: false,
+    );
+    emit(state.copyWith(devices: <OmemoDevice>[]));
+
+    GetIt.I.get<NavigationBloc>().add(PoppedRouteEvent());
+  }
+}

lib/ui/bloc/devices_event.dart

@@ -0,0 +1,21 @@
+part of 'devices_bloc.dart';
+
+abstract class DevicesEvent {}
+
+/// Triggered when the user requested the key page
+class DevicesRequestedEvent extends DevicesEvent {
+
+  DevicesRequestedEvent(this.jid);
+  final String jid;
+}
+
+/// Triggered by the UI when we want to enable or disable a key
+class DeviceEnabledSetEvent extends DevicesEvent {
+
+ DeviceEnabledSetEvent(this.deviceId, this.enabled);
+ final int deviceId;
+ final bool enabled;
+}
+
+/// Triggered by the UI when all OMEMO sessions should be recreated
+class SessionsRecreatedEvent extends DevicesEvent {}

lib/ui/bloc/devices_state.dart

@@ -0,0 +1,10 @@
+part of 'devices_bloc.dart';
+
+@freezed
+class DevicesState with _$DevicesState {
+  factory DevicesState({
+    @Default(false) bool working,
+    @Default([]) List<OmemoDevice> devices,
+    @Default('') String jid,
+  }) = _DevicesState;
+}

lib/ui/bloc/login_bloc.dart

@@ -5,7 +5,6 @@ import 'package:moxplatform/moxplatform.dart';
 import 'package:moxxyv2/shared/commands.dart';
 import 'package:moxxyv2/shared/events.dart';
 import 'package:moxxyv2/shared/helpers.dart';
-import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/ui/bloc/conversations_bloc.dart';
 import 'package:moxxyv2/ui/bloc/navigation_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
@@ -73,16 +72,17 @@ class LoginBloc extends Bloc<LoginEvent, LoginState> {
     );
 
     if (result is LoginSuccessfulEvent) {
-      GetIt.I.get<UIDataService>().isLoggedIn = true;
       emit(state.copyWith(working: false));
 
-      GetIt.I.get<UIDataService>().ownJid = state.jid;
+      // Update the UIDataService
+      GetIt.I.get<UIDataService>().processPreStartDoneEvent(result.preStart);
+
+      // Set up BLoCs
       GetIt.I.get<ConversationsBloc>().add(
         ConversationsInitEvent(
-          result.displayName,
+          result.preStart.displayName!,
           state.jid,
-          // TODO(Unknown): ???
-          <Conversation>[],
+          result.preStart.conversations!,
         ),
       );
       GetIt.I.get<NavigationBloc>().add(
@@ -98,7 +98,10 @@ class LoginBloc extends Bloc<LoginEvent, LoginState> {
       return emit(
         state.copyWith(
           working: false,
-          passwordState: LoginFormState(false, error: result.reason),
+          passwordState: LoginFormState(
+            false,
+            error: result.reason ?? 'Failed to connect',
+          ),
         ),
       );
     }

lib/ui/bloc/newconversation_bloc.dart

@@ -1,10 +1,10 @@
 import 'package:bloc/bloc.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:get_it/get_it.dart';
+import 'package:moxlib/moxlib.dart';
 import 'package:moxplatform/moxplatform.dart';
 import 'package:moxxyv2/shared/commands.dart';
 import 'package:moxxyv2/shared/events.dart';
-import 'package:moxxyv2/shared/helpers.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/shared/models/roster.dart';
 import 'package:moxxyv2/ui/bloc/conversation_bloc.dart' as conversation;

lib/ui/bloc/own_devices_bloc.dart

@@ -0,0 +1,127 @@
+import 'package:bloc/bloc.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:get_it/get_it.dart';
+import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxyv2/shared/commands.dart';
+import 'package:moxxyv2/shared/events.dart';
+import 'package:moxxyv2/shared/models/omemo_device.dart';
+import 'package:moxxyv2/ui/bloc/navigation_bloc.dart';
+import 'package:moxxyv2/ui/constants.dart';
+import 'package:moxxyv2/ui/service/data.dart';
+
+part 'own_devices_bloc.freezed.dart';
+part 'own_devices_event.dart';
+part 'own_devices_state.dart';
+
+class OwnDevicesBloc extends Bloc<OwnDevicesEvent, OwnDevicesState> {
+
+  OwnDevicesBloc() : super(OwnDevicesState()) {
+    on<OwnDevicesRequestedEvent>(_onRequested);
+    on<OwnDeviceEnabledSetEvent>(_onDeviceEnabledSet);
+    on<OwnSessionsRecreatedEvent>(_onSessionsRecreated);
+    on<OwnDeviceRemovedEvent>(_onDeviceRemoved);
+    on<OwnDeviceRegeneratedEvent>(_onDeviceRegenerated);
+  }
+
+  Future<void> _onRequested(OwnDevicesRequestedEvent event, Emitter<OwnDevicesState> emit) async {
+    emit(state.copyWith(working: true));
+
+    GetIt.I.get<NavigationBloc>().add(
+      PushedNamedEvent(
+        const NavigationDestination(ownDevicesRoute),
+      ),
+    );
+
+    // ignore: cast_nullable_to_non_nullable
+    final result = await MoxplatformPlugin.handler.getDataSender().sendData(
+      GetOwnOmemoFingerprintsCommand(),
+    ) as GetOwnOmemoFingerprintsResult;
+    
+    emit(
+      state.copyWith(
+        working: false,
+        deviceFingerprint: result.ownDeviceFingerprint,
+        deviceId: result.ownDeviceId,
+        keys: result.fingerprints,
+      ),
+    );
+  }
+  
+  Future<void> _onDeviceEnabledSet(OwnDeviceEnabledSetEvent event, Emitter<OwnDevicesState> emit) async {
+    // ignore: cast_nullable_to_non_nullable
+    await MoxplatformPlugin.handler.getDataSender().sendData(
+      SetOmemoDeviceEnabledCommand(
+        jid: GetIt.I.get<UIDataService>().ownJid!,
+        deviceId: event.deviceId,
+        enabled: event.enabled,
+      ),
+      awaitable: false,
+    );
+
+    emit(
+      state.copyWith(
+        keys: state.keys.map((key) {
+          if (key.deviceId == event.deviceId) {
+            return key.copyWith(enabled: event.enabled);
+          }
+
+          return key;
+        }).toList(),
+      ),
+    );
+  }
+
+  Future<void> _onSessionsRecreated(OwnSessionsRecreatedEvent event, Emitter<OwnDevicesState> emit) async {
+    // ignore: cast_nullable_to_non_nullable
+    await MoxplatformPlugin.handler.getDataSender().sendData(
+      RecreateSessionsCommand(jid: GetIt.I.get<UIDataService>().ownJid!),
+      awaitable: false,
+    );
+    emit(
+      state.copyWith(
+        keys: List.from(
+          state.keys.map((key) => key.copyWith(
+            hasSessionWith: false,
+          ),),
+        ),
+      ),
+    );
+
+    GetIt.I.get<NavigationBloc>().add(PoppedRouteEvent());
+  }
+
+  Future<void> _onDeviceRemoved(OwnDeviceRemovedEvent event, Emitter<OwnDevicesState> emit) async {
+    // ignore: cast_nullable_to_non_nullable
+    await MoxplatformPlugin.handler.getDataSender().sendData(
+      RemoveOwnDeviceCommand(deviceId: event.deviceId),
+      awaitable: false,
+    );
+
+    emit(
+      state.copyWith(
+        keys: List.from(
+          state.keys
+            .where((key) => key.deviceId != event.deviceId),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _onDeviceRegenerated(OwnDeviceRegeneratedEvent event, Emitter<OwnDevicesState> emit) async {
+    emit(state.copyWith(working: true));
+
+    // ignore: cast_nullable_to_non_nullable
+    final result = await MoxplatformPlugin.handler.getDataSender().sendData(
+      RegenerateOwnDeviceCommand(),
+    ) as RegenerateOwnDeviceResult;
+
+    // Update the UI state
+    emit(
+      state.copyWith(
+        deviceId: result.device.deviceId,
+        deviceFingerprint: result.device.fingerprint,
+        working: false,
+      ),
+    );
+  }
+}

lib/ui/bloc/own_devices_event.dart

@@ -0,0 +1,27 @@
+part of 'own_devices_bloc.dart';
+
+abstract class OwnDevicesEvent {}
+
+/// Triggered when the user requested the own keys page
+class OwnDevicesRequestedEvent extends OwnDevicesEvent {}
+
+/// Triggered by the UI when we want to enable or disable a key
+class OwnDeviceEnabledSetEvent extends OwnDevicesEvent {
+
+ OwnDeviceEnabledSetEvent(this.deviceId, this.enabled);
+ final int deviceId;
+ final bool enabled;
+}
+
+/// Triggered by the UI when all OMEMO sessions should be recreated
+class OwnSessionsRecreatedEvent extends OwnDevicesEvent {}
+
+/// Triggered by the UI when the OMEMO device should be regenerated
+class OwnDeviceRegeneratedEvent extends OwnDevicesEvent {}
+
+/// Triggered by the UI when the device with id [deviceId] should be removed.
+class OwnDeviceRemovedEvent extends OwnDevicesEvent {
+
+  OwnDeviceRemovedEvent(this.deviceId);
+  final int deviceId;
+}

lib/ui/bloc/own_devices_state.dart

@@ -0,0 +1,11 @@
+part of 'own_devices_bloc.dart';
+
+@freezed
+class OwnDevicesState with _$OwnDevicesState {
+  factory OwnDevicesState({
+    @Default(false) bool working,
+    @Default([]) List<OmemoDevice> keys,
+    @Default(-1) int deviceId,
+    @Default('') String deviceFingerprint,
+  }) = _OwnDevicesState;
+}

lib/ui/bloc/preferences_bloc.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:io';
 import 'package:bloc/bloc.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter/widgets.dart';
 import 'package:get_it/get_it.dart';
@@ -40,6 +41,11 @@ class PreferencesBloc extends Bloc<PreferencesEvent, PreferencesState> {
       );
     }
 
+    if (!kDebugMode) {
+      final enableDebug = event.preferences.debugEnabled;
+      Logger.root.level = enableDebug ? Level.ALL : Level.INFO;
+    }
+    
     emit(event.preferences);
   }
 

lib/ui/bloc/share_selection_bloc.dart

@@ -3,16 +3,16 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:get_it/get_it.dart';
 import 'package:move_to_background/move_to_background.dart';
 import 'package:moxplatform/moxplatform.dart';
+import 'package:moxxmpp/moxxmpp.dart';
 import 'package:moxxyv2/shared/commands.dart';
-import 'package:moxxyv2/shared/helpers.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
 import 'package:moxxyv2/shared/models/roster.dart';
 import 'package:moxxyv2/ui/bloc/conversations_bloc.dart';
 import 'package:moxxyv2/ui/bloc/navigation_bloc.dart';
 import 'package:moxxyv2/ui/bloc/newconversation_bloc.dart';
+import 'package:moxxyv2/ui/bloc/preferences_bloc.dart';
 import 'package:moxxyv2/ui/bloc/sendfiles_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 
 part 'share_selection_bloc.freezed.dart';
 part 'share_selection_event.dart';
@@ -26,11 +26,12 @@ enum ShareSelectionType {
 
 /// Create a common ground between Conversations and RosterItems
 class ShareListItem {
-  const ShareListItem(this.avatarPath, this.jid, this.title, this.isConversation);
+  const ShareListItem(this.avatarPath, this.jid, this.title, this.isConversation, this.isEncrypted);
   final String avatarPath;
   final String jid;
   final String title;
   final bool isConversation;
+  final bool isEncrypted;
 }
 
 class ShareSelectionBloc extends Bloc<ShareSelectionEvent, ShareSelectionState> {
@@ -65,6 +66,7 @@ class ShareSelectionBloc extends Bloc<ShareSelectionEvent, ShareSelectionState>
           c.jid,
           c.title,
           true,
+          c.encrypted,
         );
       }),
     );
@@ -80,6 +82,7 @@ class ShareSelectionBloc extends Bloc<ShareSelectionEvent, ShareSelectionState>
             rosterItem.jid,
             rosterItem.title,
             false,
+            GetIt.I.get<PreferencesBloc>().state.enableOmemoByDefault,
           ),
         );
       } else {
@@ -88,6 +91,7 @@ class ShareSelectionBloc extends Bloc<ShareSelectionEvent, ShareSelectionState>
           rosterItem.jid,
           rosterItem.title,
           false,
+          items[index].isEncrypted,
         );
       }
     }

lib/ui/constants.dart

@@ -9,12 +9,19 @@ const EdgeInsetsGeometry textfieldPaddingRegular = EdgeInsets.only(top: 4, botto
 const EdgeInsetsGeometry textfieldPaddingConversation = EdgeInsets.all(10);
 
 const int primaryColorHexRGBO = 0xffcf4aff;
+const int primaryColorAltHexRGB = 0xff9c18cd;
+const int primaryColorDisabledHexRGB = 0xff9a7fa9;
+const int textColorDisabledHexRGB = 0xffcacaca;
 const Color primaryColor = Color(primaryColorHexRGBO);
+const Color primaryColorAlt = Color(primaryColorAltHexRGB);
+const Color primaryColorDisabled = Color(primaryColorDisabledHexRGB);
+const Color textColorDisabled = Color(textColorDisabledHexRGB);
 
-const Color bubbleColorSent = Color(0xffa139f0);
+const Color bubbleColorSent = Color(0xff7e0bce);
 const Color bubbleColorSentQuoted = bubbleColorSent;
 const Color bubbleColorReceived = Color(0xff222222);
 const Color bubbleColorReceivedQuoted = bubbleColorReceived;
+const Color bubbleColorUnencrypted = Color(0xffd40000);
 
 const double paddingVeryLarge = 64;
 
@@ -53,6 +60,9 @@ const String privacyRoute = '$settingsRoute/privacy';
 const String networkRoute = '$settingsRoute/network';
 const String backgroundCroppingRoute = '$settingsRoute/appearance/background';
 const String conversationSettingsRoute = '$settingsRoute/conversation';
+const String appearanceRoute = '$settingsRoute/appearance';
 const String blocklistRoute = '/blocklist';
 const String shareSelectionRoute = '/share_selection';
 const String serverInfoRoute = '$profileRoute/server_info';
+const String devicesRoute = '$profileRoute/devices';
+const String ownDevicesRoute = '$profileRoute/own_devices';

lib/ui/events.dart

@@ -1,6 +1,6 @@
 import 'dart:async';
 import 'dart:io';
-import 'package:flutter/painting.dart';
+import 'package:flutter/widgets.dart';
 import 'package:get_it/get_it.dart';
 import 'package:logging/logging.dart';
 import 'package:moxlib/awaitabledatasender.dart';
@@ -29,7 +29,7 @@ void setupEventHandler() {
       EventTypeMatcher<ProgressEvent>(onProgress),
       EventTypeMatcher<SelfAvatarChangedEvent>(onSelfAvatarChanged),
       EventTypeMatcher<PreStartDoneEvent>(preStartDone),
-      EventTypeMatcher<ServiceReadyEvent>(onServiceReady)
+      EventTypeMatcher<ServiceReadyEvent>(onServiceReady),
   ]);
 
   GetIt.I.registerSingleton<EventHandler>(handler);
@@ -139,7 +139,9 @@ Future<void> onServiceReady(ServiceReadyEvent event, { dynamic extra }) async {
   await GetIt.I.get<Completer<void>>().future;
   GetIt.I.get<Logger>().fine('onServiceReady: Done');
   await MoxplatformPlugin.handler.getDataSender().sendData(
-    PerformPreStartCommand(),
+    PerformPreStartCommand(
+      systemLocaleCode: WidgetsBinding.instance.platformDispatcher.locale.toLanguageTag(),
+    ),
     awaitable: false,
   );
 }

lib/ui/helpers.dart

@@ -1,37 +1,43 @@
 import 'dart:async';
 import 'dart:typed_data';
-
 import 'package:cryptography/cryptography.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_image_compress/flutter_image_compress.dart';
 import 'package:get_it/get_it.dart';
 import 'package:hex/hex.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/avatar.dart';
 import 'package:moxxyv2/ui/bloc/crop_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
 
 /// Shows a dialog asking the user if they are sure that they want to proceed with an
-/// action.
-Future<void> showConfirmationDialog(String title, String body, BuildContext context, void Function() callback) async {
-  await showDialog<dynamic>(
+/// action. Resolves to true if the user pressed the confirm button. Returns false if
+/// the cancel button was pressed.
+Future<bool> showConfirmationDialog(String title, String body, BuildContext context) async {
+  final result = await showDialog<bool>(
     context: context,
     barrierDismissible: false,
     builder: (context) => AlertDialog(
       title: Text(title),
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.circular(textfieldRadiusRegular),
+      ),
       content: Text(body),
       actions: [
         TextButton(
-          onPressed: callback,
-          child: const Text('Yes'),
+          onPressed: () => Navigator.of(context).pop(true),
+          child: Text(t.global.yes),
         ),
         TextButton(
           onPressed: Navigator.of(context).pop,
-          child: const Text('No'),
+          child: Text(t.global.no),
         )
       ],
     ),
   );
+
+  return result != null;
 }
 
 /// Shows a dialog telling the user that the [feature] feature is not implemented.
@@ -42,6 +48,9 @@ Future<void> showNotImplementedDialog(String feature, BuildContext context) asyn
     builder: (BuildContext context) {
       return AlertDialog(
         title: const Text('Not Implemented'),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(textfieldRadiusRegular),
+        ),
         content: SingleChildScrollView(
           child: ListBody(
             children: [
@@ -51,7 +60,7 @@ Future<void> showNotImplementedDialog(String feature, BuildContext context) asyn
         ),
         actions: [
           TextButton(
-            child: const Text('Okay'),
+            child: Text(t.global.dialogAccept),
             onPressed: () => Navigator.of(context).pop(),
           )
         ],
@@ -67,11 +76,14 @@ Future<void> showInfoDialog(String title, String body, BuildContext context) asy
     barrierDismissible: false,
     builder: (context) => AlertDialog(
       title: Text(title),
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.circular(textfieldRadiusRegular),
+      ),
       content: Text(body),
       actions: [
         TextButton(
           onPressed: Navigator.of(context).pop,
-          child: const Text('Okay'),
+          child: Text(t.global.dialogAccept),
         )
       ],
     ),
@@ -154,3 +166,16 @@ Color getTileColor(BuildContext context) {
     case Brightness.dark: return tileColorDark;
   }
 }
+
+/// Return the corresponding language name (in its language) for the given
+/// language code [localeCode], e.g. "de", "en", ...
+String localeCodeToLanguageName(String localeCode) {
+  switch (localeCode) {
+    case 'de': return 'Deutsch';
+    case 'en': return 'English';
+    case 'default': return t.pages.settings.appearance.systemLanguage;
+  }
+
+  assert(false, 'Language code $localeCode has no name');
+  return '';
+}

lib/ui/pages/addcontact.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/bloc/addcontact_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/helpers.dart';
@@ -8,7 +9,7 @@ import 'package:moxxyv2/ui/widgets/textfield.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
 
 class AddContactPage extends StatelessWidget {
-  const AddContactPage({ Key? key }) : super(key: key);
+  const AddContactPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const AddContactPage(),
@@ -21,7 +22,7 @@ class AddContactPage extends StatelessWidget {
   Widget build(BuildContext context) {
     return BlocBuilder<AddContactBloc, AddContactState>(
       builder: (context, state) => Scaffold(
-        appBar: BorderlessTopbar.simple('Add new contact'),
+        appBar: BorderlessTopbar.simple(t.pages.addcontact.title),
         body: Column(
           children: [
             Visibility(
@@ -32,7 +33,7 @@ class AddContactPage extends StatelessWidget {
             Padding(
               padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge).add(const EdgeInsets.only(top: 8)),
               child: CustomTextField(
-                labelText: 'XMPP-Address',
+                labelText: t.pages.addcontact.xmppAddress,
                 onChanged: (value) => context.read<AddContactBloc>().add(
                   JidChangedEvent(value),
                 ),
@@ -52,9 +53,7 @@ class AddContactPage extends StatelessWidget {
 
             Padding(
               padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge).add(const EdgeInsets.only(top: 8)),
-              child: const Text(
-                'You can add a contact either by typing in their XMPP address or by scanning their QR code',
-              ),
+              child: Text(t.pages.addcontact.subtitle),
             ),
             
             Padding(
@@ -63,10 +62,10 @@ class AddContactPage extends StatelessWidget {
                 children: [
                   Expanded(
                     child: RoundedButton(
-                      color: Colors.purple,
                       cornerRadius: 32,
                       onTap: () => context.read<AddContactBloc>().add(AddedContactEvent()),
-                      child: const Text('Add to contacts'),
+                      enabled: !state.working,
+                      child: Text(t.pages.addcontact.buttonAddToContact),
                     ),
                   )
                 ],

lib/ui/pages/blocklist.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/bloc/blocklist_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/helpers.dart';
@@ -10,7 +11,7 @@ enum BlocklistOptions {
 }
 
 class BlocklistPage extends StatelessWidget {
-  const BlocklistPage({ Key? key }) : super(key: key);
+  const BlocklistPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const BlocklistPage(),
@@ -30,9 +31,9 @@ class BlocklistPage extends StatelessWidget {
               padding: const EdgeInsets.only(top: 8),
               child: Image.asset('assets/images/happy_news.png'),
             ),
-            const Padding(
-              padding: EdgeInsets.only(top: 8),
-              child: Text('You have no users blocked'),
+            Padding(
+              padding: const EdgeInsets.only(top: 8),
+              child: Text(t.pages.blocklist.noUsersBlocked),
             )
           ],
         ),
@@ -58,16 +59,19 @@ class BlocklistPage extends StatelessWidget {
               IconButton(
                 icon: const Icon(Icons.delete),
                 color: Colors.red,
-                onPressed: () => showConfirmationDialog(
-                  'Unblock $jid?',
-                  'Are you sure you want to unblock $jid? You will receive messages from this user again.',
-                  context,
-                  () {
+                onPressed: () async {
+                  final result = await showConfirmationDialog(
+                    t.pages.blocklist.unblockJidConfirmTitle(jid: jid),
+                    t.pages.blocklist.unblockJidConfirmBody(jid: jid),
+                    context,
+                  );
+
+                  if (result) {
+                    // ignore: use_build_context_synchronously
                     context.read<BlocklistBloc>().add(UnblockedJidEvent(jid));
-                    Navigator.of(context).pop();
                   }
-                ),
-              )
+                },
+              ),
             ],
           ),
         );
@@ -80,29 +84,33 @@ class BlocklistPage extends StatelessWidget {
     return BlocBuilder<BlocklistBloc, BlocklistState>(
       builder: (context, state) => Scaffold(
         appBar: BorderlessTopbar.simple(
-          'Blocklist',
+          t.pages.blocklist.title,
           extra: [
             Expanded(child: Container()),
             PopupMenuButton(
-              onSelected: (BlocklistOptions result) {
+              onSelected: (BlocklistOptions result) async {
                 if (result == BlocklistOptions.unblockAll) {
-                  showConfirmationDialog(
-                    'Are you sure?',
-                    'Are you sure you want to unblock all users?',
+                  final result = await showConfirmationDialog(
+                    t.pages.blocklist.unblockAllConfirmTitle,
+                    t.pages.blocklist.unblockAllConfirmBody,
                     context,
-                    () {
-                      context.read<BlocklistBloc>().add(UnblockedAllEvent());
-                      Navigator.of(context).pop();
-                    }
                   );
+
+                  if (result) {
+                    // ignore: use_build_context_synchronously
+                    context.read<BlocklistBloc>().add(UnblockedAllEvent());
+
+                    // ignore: use_build_context_synchronously
+                    Navigator.of(context).pop();
+                  }
                 }
               },
               icon: const Icon(Icons.more_vert),
               itemBuilder: (BuildContext context) => [
-                const PopupMenuItem(
+                PopupMenuItem(
                   value: BlocklistOptions.unblockAll,
-                  child: Text('Unblock all'),
-                )
+                  child: Text(t.pages.blocklist.unblockAll),
+                ),
               ],
             )
           ],

lib/ui/pages/conversation/bottom.dart

@@ -12,8 +12,7 @@ import 'package:moxxyv2/ui/widgets/textfield.dart';
 import 'package:phosphor_flutter/phosphor_flutter.dart';
 
 class ConversationBottomRow extends StatelessWidget {
-
-  const ConversationBottomRow(this.controller, this.isSpeedDialOpen, {Key? key}) : super(key: key);
+  const ConversationBottomRow(this.controller, this.isSpeedDialOpen, { super.key });
   final TextEditingController controller;
   final ValueNotifier<bool> isSpeedDialOpen;
 

lib/ui/pages/conversation/conversation.dart

@@ -10,10 +10,9 @@ import 'package:moxxyv2/ui/pages/conversation/bottom.dart';
 import 'package:moxxyv2/ui/pages/conversation/helpers.dart';
 import 'package:moxxyv2/ui/pages/conversation/topbar.dart';
 import 'package:moxxyv2/ui/widgets/chat/chatbubble.dart';
-import 'package:moxxyv2/ui/widgets/topbar.dart';
 
 class ConversationPage extends StatefulWidget {
-  const ConversationPage({ Key? key }) : super(key: key);
+  const ConversationPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (context) => const ConversationPage(),
@@ -27,7 +26,6 @@ class ConversationPage extends StatefulWidget {
 }
 
 class ConversationPageState extends State<ConversationPage> with TickerProviderStateMixin {
-
   ConversationPageState() :
     _isSpeedDialOpen = ValueNotifier(false),
     _controller = TextEditingController(),
@@ -84,6 +82,7 @@ class ConversationPageState extends State<ConversationPage> with TickerProviderS
     return ChatBubble(
       message: item,
       sentBySelf: isSent(item, jid),
+      chatEncrypted: state.conversation!.encrypted,
       start: start,
       end: end,
       between: between,
@@ -106,21 +105,25 @@ class ConversationPageState extends State<ConversationPage> with TickerProviderS
             Expanded(
               child: TextButton(
                 child: const Text('Add to contacts'),
-                onPressed: () {
+                onPressed: () async {
                   final jid = state.conversation!.jid;
-                  showConfirmationDialog(
+                  final result = await showConfirmationDialog(
                     'Add $jid to your contacts?',
                     'Are you sure you want to add $jid to your conacts?',
                     context,
-                    () {
-                      // TODO(Unknown): Maybe show a progress indicator
-                      // TODO(Unknown): Have the page update its state once the addition is done
-                      context.read<ConversationBloc>().add(
-                        JidAddedEvent(jid),
-                      );
-                      Navigator.of(context).pop();
-                    }
                   );
+
+                  if (result) {
+                    // TODO(Unknown): Maybe show a progress indicator
+                    // TODO(Unknown): Have the page update its state once the addition is done
+                    // ignore: use_build_context_synchronously
+                    context.read<ConversationBloc>().add(
+                      JidAddedEvent(jid),
+                    );
+
+                    // ignore: use_build_context_synchronously
+                    Navigator.of(context).pop();
+                  }
                 },
               ),
             ),
@@ -213,7 +216,7 @@ class ConversationPageState extends State<ConversationPage> with TickerProviderS
             child: Scaffold(
               // TODO(Unknown): Maybe replace the scaffold itself to prevent transparency
               backgroundColor: const Color.fromRGBO(0, 0, 0, 0),
-              appBar: const BorderlessTopbar(ConversationTopbarWidget()),
+              appBar: const ConversationTopbar(),
               body: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
@@ -229,7 +232,7 @@ class ConversationPageState extends State<ConversationPage> with TickerProviderS
                   BlocBuilder<ConversationBloc, ConversationState>(
                     // NOTE: We don't need to update when the jid changes as it should
                     //       be static over the entire lifetime of the BLoC.
-                    buildWhen: (prev, next) => prev.messages != next.messages,
+                    buildWhen: (prev, next) => prev.messages != next.messages || prev.conversation!.encrypted != next.conversation!.encrypted,
                     builder: (context, state) => Expanded(
                       child: ListView.builder(
                         reverse: true,

lib/ui/pages/conversation/helpers.dart

@@ -4,14 +4,18 @@ import 'package:moxxyv2/ui/bloc/conversation_bloc.dart';
 import 'package:moxxyv2/ui/helpers.dart';
 
 /// Sends a block command to the service to block [jid].
-void blockJid(String jid, BuildContext context) {
-  showConfirmationDialog(
+Future<void> blockJid(String jid, BuildContext context) async {
+  final result = await showConfirmationDialog(
     'Block $jid?',
     "Are you sure you want to block $jid? You won't receive messages from them until you unblock them.",
     context,
-    () {
-      context.read<ConversationBloc>().add(JidBlockedEvent(jid));
-      Navigator.of(context).pop();
-    }
   );
+
+  if (result) {
+    // ignore: use_build_context_synchronously
+    context.read<ConversationBloc>().add(JidBlockedEvent(jid));
+
+    // ignore: use_build_context_synchronously
+    Navigator.of(context).pop();
+  }
 }

lib/ui/pages/conversation/topbar.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:get_it/get_it.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/bloc/conversation_bloc.dart';
 import 'package:moxxyv2/ui/bloc/conversations_bloc.dart';
 import 'package:moxxyv2/ui/bloc/profile_bloc.dart' as profile;
@@ -9,7 +11,6 @@ import 'package:moxxyv2/ui/pages/conversation/helpers.dart';
 import 'package:moxxyv2/ui/widgets/avatar.dart';
 import 'package:moxxyv2/ui/widgets/chat/typing.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 
 enum ConversationOption {
   close,
@@ -36,26 +37,31 @@ PopupMenuItem<dynamic> popupItemWithIcon(dynamic value, String text, IconData ic
   );
 }
 
-/// A custom version of the Topbar NameAndAvatar style to integrate with
-/// bloc.
-// TODO(Unknown): If the display name is too long, then it will cause an overflow.
-class ConversationTopbarWidget extends StatelessWidget {
-  const ConversationTopbarWidget({ Key? key }) : super(key: key);
+/// A custom version of the BorderlessTopbar to display the conversation topbar
+/// as it should
+// TODO(PapaTutuWawa): The conversation title may overflow the Topbar
+// TODO(Unknown): Maybe merge with BorderlessTopbar
+class ConversationTopbar extends StatelessWidget implements PreferredSizeWidget {
+  const ConversationTopbar({ super.key });
+
+  @override
+  Size get preferredSize => const Size.fromHeight(60);
 
   bool _shouldRebuild(ConversationState prev, ConversationState next) {
     return prev.conversation?.title != next.conversation?.title
       || prev.conversation?.avatarUrl != next.conversation?.avatarUrl
       || prev.conversation?.chatState != next.conversation?.chatState
-      || prev.conversation?.jid != next.conversation?.jid;
+      || prev.conversation?.jid != next.conversation?.jid
+      || prev.conversation?.encrypted != next.conversation?.encrypted;
   }
-
+  
   Widget _buildChatState(ChatState state) {
     switch (state) {
       case ChatState.paused:
       case ChatState.active:
-        return const Text(
-          'Online',
-          style: TextStyle(
+        return Text(
+          t.pages.conversation.online,
+          style: const TextStyle(
             color: Colors.green,
           ),
         );
@@ -67,83 +73,138 @@ class ConversationTopbarWidget extends StatelessWidget {
         return Container();
     } 
   }
+
+  bool _isChatStateVisible(ChatState state) {
+    return state != ChatState.inactive && state != ChatState.gone;
+  }
   
   @override
   Widget build(BuildContext context) {
     return BlocBuilder<ConversationBloc, ConversationState>(
       buildWhen: _shouldRebuild,
       builder: (context, state) {
-        return TopbarAvatarAndName(
-          IntrinsicHeight(
-            child: Column(
-              children: [
-                TopbarTitleText(state.conversation!.title),
-                _buildChatState(state.conversation!.chatState)
-              ],
-            ),
-          ),
-          Hero(
-            tag: 'conversation_profile_picture',
-            child: Material(
-              color: const Color.fromRGBO(0, 0, 0, 0),
-              child: AvatarWrapper(
-                radius: 25,
-                avatarUrl: state.conversation!.avatarUrl,
-                altText: state.conversation!.title,
+        return SizedBox(
+          width: MediaQuery.of(context).size.width,
+          child: SafeArea(
+            child: ColoredBox(
+              color: Theme.of(context).scaffoldBackgroundColor,
+              child: Padding(
+                padding: const EdgeInsets.all(8),
+                child: Flex(
+                  direction: Axis.horizontal,
+                  children: [
+                    const BackButton(),
+                    Hero(
+                      tag: 'conversation_profile_picture',
+                      child: Material(
+                        color: const Color.fromRGBO(0, 0, 0, 0),
+                        child: AvatarWrapper(
+                          radius: 25,
+                          avatarUrl: state.conversation!.avatarUrl,
+                          altText: state.conversation!.title,
+                        ),
+                      ),
+                    ),
+                    Expanded(
+                      child: InkWell(
+                        onTap: () => GetIt.I.get<profile.ProfileBloc>().add(
+                          profile.ProfilePageRequestedEvent(
+                            false,
+                            conversation: context.read<ConversationBloc>().state.conversation,
+                          ),
+                        ),
+                        child: Stack(
+                          children: [
+                            AnimatedPositioned(
+                              duration: const Duration(milliseconds: 200),
+                              top: _isChatStateVisible(state.conversation!.chatState) ?
+                                0 :
+                                10,
+                              left: 0,
+                              right: 0,
+                              curve: Curves.easeInOutCubic,
+                              child: Row(
+                                mainAxisAlignment: MainAxisAlignment.center,
+                                children: [
+                                  TopbarTitleText(state.conversation!.title),
+                                ],
+                              ),
+                            ),
+                            Positioned(
+                              left: 0,
+                              right: 0,
+                              bottom: 0,
+                              child: AnimatedOpacity(
+                                opacity: _isChatStateVisible(state.conversation!.chatState) ?
+                                  1.0 :
+                                  0.0,
+                                curve: Curves.easeInOutCubic,
+                                duration: const Duration(milliseconds: 100),
+                                child: Row(
+                                  mainAxisAlignment: MainAxisAlignment.center,
+                                  children: [
+                                    _buildChatState(state.conversation!.chatState),
+                                  ],
+                                ),
+                              ),
+                            ),
+                          ],
+                        ),
+                      ),
+                    ),
+                    // ignore: implicit_dynamic_type
+                    PopupMenuButton(
+                      onSelected: (result) {
+                        if (result == EncryptionOption.omemo && state.conversation!.encrypted == false) {
+                          context.read<ConversationBloc>().add(OmemoSetEvent(true));
+                        } else if (result == EncryptionOption.none && state.conversation!.encrypted == true) {
+                          context.read<ConversationBloc>().add(OmemoSetEvent(false));
+                        }
+                      },
+                      icon: state.conversation!.encrypted ?
+                      const Icon(Icons.lock) :
+                      const Icon(Icons.lock_open),
+                      itemBuilder: (BuildContext c) => [
+                        popupItemWithIcon(EncryptionOption.none, t.pages.conversation.unencrypted, Icons.lock_open),
+                        popupItemWithIcon(EncryptionOption.omemo, t.pages.conversation.encrypted, Icons.lock),
+                      ],
+                    ),
+                    // ignore: implicit_dynamic_type
+                    PopupMenuButton(
+                      onSelected: (result) async {
+                        switch (result) {
+                          case ConversationOption.close: {
+                            final result = await showConfirmationDialog(
+                              t.pages.conversation.closeChatConfirmTitle,
+                              t.pages.conversation.closeChatConfirmSubtext,
+                              context,
+                            );
+
+                            if (result) {
+                              // ignore: use_build_context_synchronously
+                              context.read<ConversationsBloc>().add(
+                                ConversationClosedEvent(state.conversation!.jid),
+                              );
+                            }
+                          }
+                          break;
+                          case ConversationOption.block: {
+                            await blockJid(state.conversation!.jid, context);
+                          }
+                          break;
+                        }
+                      },
+                      icon: const Icon(Icons.more_vert),
+                      itemBuilder: (BuildContext c) => [
+                        popupItemWithIcon(ConversationOption.close, t.pages.conversation.closeChat, Icons.close),
+                        popupItemWithIcon(ConversationOption.block, t.pages.conversation.blockUser, Icons.block)
+                      ],
+                    ),
+                  ],
+                ),
               ),
-            ),
+            ),   
           ),
-          () => GetIt.I.get<profile.ProfileBloc>().add(
-            profile.ProfilePageRequestedEvent(
-              false,
-              conversation: context.read<ConversationBloc>().state.conversation,
-            ),
-          ),
-          extra: [
-            // ignore: implicit_dynamic_type
-            PopupMenuButton(
-              onSelected: (result) {
-                if (result == EncryptionOption.omemo) {
-                  showNotImplementedDialog('End-to-End encryption', context);
-                }
-              },
-              icon: const Icon(Icons.lock_open),
-              itemBuilder: (BuildContext c) => [
-                popupItemWithIcon(EncryptionOption.none, 'Unencrypted', Icons.lock_open),
-                popupItemWithIcon(EncryptionOption.omemo, 'Encrypted', Icons.lock),
-              ],
-            ),
-            // ignore: implicit_dynamic_type
-            PopupMenuButton(
-              onSelected: (result) {
-                switch (result) {
-                  case ConversationOption.close: {
-                    showConfirmationDialog(
-                      'Close Chat',
-                      'Are you sure you want to close this chat?',
-                      context,
-                      () {
-                        context.read<ConversationsBloc>().add(
-                          ConversationClosedEvent(state.conversation!.jid),
-                        );
-                        Navigator.of(context).pop();
-                      }
-                    );
-                  }
-                  break;
-                  case ConversationOption.block: {
-                    blockJid(state.conversation!.jid, context);
-                  }
-                  break;
-                }
-              },
-              icon: const Icon(Icons.more_vert),
-              itemBuilder: (BuildContext c) => [
-                popupItemWithIcon(ConversationOption.close, 'Close chat', Icons.close),
-                popupItemWithIcon(ConversationOption.block, 'Block contact', Icons.block)
-              ],
-            )
-          ],
         );
       },
     );

lib/ui/pages/conversations.dart

@@ -2,6 +2,8 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_speed_dial/flutter_speed_dial.dart';
 import 'package:get_it/get_it.dart';
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/bloc/conversation_bloc.dart';
 import 'package:moxxyv2/ui/bloc/conversations_bloc.dart';
 import 'package:moxxyv2/ui/bloc/profile_bloc.dart' as profile;
@@ -10,14 +12,13 @@ import 'package:moxxyv2/ui/helpers.dart';
 import 'package:moxxyv2/ui/widgets/avatar.dart';
 import 'package:moxxyv2/ui/widgets/conversation.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
-import 'package:moxxyv2/xmpp/xeps/xep_0085.dart';
 
 enum ConversationsOptions {
   settings
 }
 
 class ConversationsPage extends StatelessWidget {
-  const ConversationsPage({ Key? key }) : super(key: key);
+  const ConversationsPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (context) => const ConversationsPage(),
@@ -34,6 +35,7 @@ class ConversationsPage extends StatelessWidget {
         itemCount: state.conversations.length,
         itemBuilder: (_context, index) {
           final item = state.conversations[index];
+
           return Dismissible(
             key: ValueKey('conversation;$item'),
             onDismissed: (direction) => context.read<ConversationsBloc>().add(
@@ -65,6 +67,7 @@ class ConversationsPage extends StatelessWidget {
                 item.lastChangeTimestamp,
                 true,
                 typingIndicator: item.chatState == ChatState.composing,
+                lastMessageRetracted: item.lastMessageRetracted,
                 key: ValueKey('conversationRow;${item.jid}'),
               ),
             ), 
@@ -82,12 +85,12 @@ class ConversationsPage extends StatelessWidget {
             // TODO(Unknown): Maybe somehow render the svg
             child: Image.asset('assets/images/begin_chat.png'),
           ),
-          const Padding(
-            padding: EdgeInsets.only(top: 8),
-            child: Text('You have no open chats'),
+          Padding(
+            padding: const EdgeInsets.only(top: 8),
+            child: Text(t.pages.conversations.noOpenChats),
           ),
           TextButton(
-            child: const Text('Start a chat'),
+            child: Text(t.pages.conversations.startChat),
             onPressed: () => Navigator.pushNamed(context, newConversationRoute),
           )
         ],
@@ -132,9 +135,9 @@ class ConversationsPage extends StatelessWidget {
                 },
                 icon: const Icon(Icons.more_vert),
                 itemBuilder: (BuildContext context) => [
-                  const PopupMenuItem(
+                  PopupMenuItem(
                     value: ConversationsOptions.settings,
-                    child: Text('Settings'),
+                    child: Text(t.pages.conversations.overlaySettings),
                   )
                 ],
               )
@@ -155,7 +158,7 @@ class ConversationsPage extends StatelessWidget {
               backgroundColor: primaryColor,
               // TODO(Unknown): Theme dependent?
               foregroundColor: Colors.white,
-              label: 'Join groupchat',
+              label: t.pages.conversations.speeddialJoinGroupchat,
             ),
             SpeedDialChild(
               child: const Icon(Icons.person_add),
@@ -163,7 +166,7 @@ class ConversationsPage extends StatelessWidget {
               backgroundColor: primaryColor,
               // TODO(Unknown): Theme dependent?
               foregroundColor: Colors.white,
-              label: 'New chat',
+              label: t.pages.conversations.speeddialNewChat,
             )
           ],
         ),

lib/ui/pages/crop.dart

@@ -1,13 +1,13 @@
 import 'package:crop_your_image/crop_your_image.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/bloc/crop_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/widgets/button.dart';
 
 class CropPage extends StatelessWidget {
-
-  CropPage({ Key? key }) : _controller = CropController(), super(key: key);
+  CropPage({ super.key }) : _controller = CropController();
   final CropController _controller;
  
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
@@ -59,10 +59,9 @@ class CropPage extends StatelessWidget {
             mainAxisAlignment: MainAxisAlignment.center,
             children: [
               RoundedButton(
-                color: primaryColor,
                 cornerRadius: 100,
                 onTap: _controller.crop,
-                child: const Text('Set as profile picture'),
+                child: Text(t.pages.crop.setProfilePicture),
               ),
             ],
           ),

lib/ui/pages/intro.dart

@@ -1,10 +1,11 @@
 import 'package:flutter/material.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/helpers.dart';
 import 'package:moxxyv2/ui/widgets/button.dart';
 
 class Intro extends StatelessWidget {
-  const Intro({ Key? key }) : super(key: key);
+  const Intro({ super.key });
  
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const Intro(),
@@ -36,11 +37,11 @@ class Intro extends StatelessWidget {
                 ),
               ),
             ),
-            const Padding(
-              padding: EdgeInsets.symmetric(horizontal: paddingVeryLarge),
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge),
               child: Text(
-                'An experiment into building a modern, easy and beautiful XMPP client.',
-                style: TextStyle(
+                t.global.moxxySubtitle,
+                style: const TextStyle(
                   fontSize: fontsizeBody,
                 ),
               ),
@@ -51,23 +52,22 @@ class Intro extends StatelessWidget {
                 children: [
                   Expanded(
                     child: RoundedButton(
-                      color: Colors.purple,
                       cornerRadius: 32,
                       onTap: () => Navigator.of(context).pushNamed(
                         loginRoute,
                       ),
-                      child: const Text('Login'),
+                      child: Text(t.pages.intro.loginButton),
                     ),
                   )
                 ],
               ),
             ),
             const Spacer(),
-            const Padding(
-              padding: EdgeInsets.symmetric(horizontal: paddingVeryLarge),
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge),
               child: Text(
-                'Have no XMPP account? No worries, creating one is really easy.',
-                style: TextStyle(
+                t.pages.intro.noAccount,
+                style: const TextStyle(
                   fontSize: fontsizeBody,
                 ),
               ),
@@ -78,7 +78,7 @@ class Intro extends StatelessWidget {
                   child: Padding(
                     padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge).add(const EdgeInsets.only(bottom: paddingVeryLarge)),
                     child: TextButton(
-                      child: const Text('Register'),
+                      child: Text(t.pages.intro.registerButton),
                       onPressed: () {
                         // Navigator.pushNamed(context, registrationRoute);
                         showNotImplementedDialog('registration', context);

lib/ui/pages/login.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/bloc/login_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/widgets/button.dart';
@@ -7,7 +8,7 @@ import 'package:moxxyv2/ui/widgets/textfield.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
 
 class Login extends StatelessWidget {
-  const Login({ Key? key }) : super(key: key);
+  const Login({ super.key });
  
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const Login(),
@@ -21,7 +22,7 @@ class Login extends StatelessWidget {
       builder: (BuildContext context, LoginState state) => WillPopScope(
         onWillPop: () async => !state.working,
         child: Scaffold(
-          appBar: BorderlessTopbar.simple('Login'),
+          appBar: BorderlessTopbar.simple(t.pages.login.title),
           body: Column(
             children: [
               Visibility(
@@ -35,7 +36,7 @@ class Login extends StatelessWidget {
                 child: CustomTextField(
                   // ignore: avoid_dynamic_calls
                   errorText: state.jidState.error,
-                  labelText: 'XMPP-Address',
+                  labelText: t.pages.login.xmppAddress,
                   enabled: !state.working,
                   cornerRadius: textfieldRadiusRegular,
                   borderColor: primaryColor,
@@ -49,7 +50,7 @@ class Login extends StatelessWidget {
                 child: CustomTextField(
                   // ignore: avoid_dynamic_calls
                   errorText: state.passwordState.error,
-                  labelText: 'Password',
+                  labelText: t.pages.login.password,
                   suffixIcon: Padding(
                     padding: const EdgeInsetsDirectional.only(end: 8),
                     child: InkWell(
@@ -71,12 +72,12 @@ class Login extends StatelessWidget {
               Padding(
                 padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge).add(const EdgeInsets.only(top: 8)),
                 child: ExpansionTile(
-                  title: const Text('Advanced options'),
+                  title: Text(t.pages.login.advancedOptions),
                   children: [
                     Column(
                       children: [
                         SwitchListTile(
-                          title: const Text('Create account on server'),
+                          title: Text(t.pages.login.createAccount),
                           value: false,
                           // TODO(Unknown): Implement
                           onChanged: state.working ? null : (value) {},
@@ -92,9 +93,9 @@ class Login extends StatelessWidget {
                   children: [
                     Expanded(
                       child: RoundedButton(
-                        color: Colors.purple,
                         cornerRadius: 32,
-                        onTap: state.working ? null : () => context.read<LoginBloc>().add(LoginSubmittedEvent()),
+                        enabled: !state.working,
+                        onTap: () => context.read<LoginBloc>().add(LoginSubmittedEvent()),
                         child: const Text('Login'),
                       ),
                     )

lib/ui/pages/newconversation.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/constants.dart';
 import 'package:moxxyv2/ui/bloc/newconversation_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
@@ -9,7 +10,7 @@ import 'package:moxxyv2/ui/widgets/conversation.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
 
 class NewConversationPage extends StatelessWidget {
-  const NewConversationPage({ Key? key }) : super(key: key);
+  const NewConversationPage({ super.key });
  
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const NewConversationPage(),
@@ -49,7 +50,7 @@ class NewConversationPage extends StatelessWidget {
   Widget build(BuildContext context) {
     final maxTextWidth = MediaQuery.of(context).size.width * 0.6;
     return Scaffold(
-      appBar: BorderlessTopbar.simple('Start new chat'),
+      appBar: BorderlessTopbar.simple(t.pages.newconversation.title),
       body: BlocBuilder<NewConversationBloc, NewConversationState>(
         builder: (BuildContext context, NewConversationState state) => ListView.builder(
           itemCount: state.roster.length + 2,
@@ -57,12 +58,12 @@ class NewConversationPage extends StatelessWidget {
             switch(index) {
               case 0: return _renderIconEntry(
                 Icons.person_add,
-                'Add contact',
+                t.pages.newconversation.addContact,
                 () => Navigator.pushNamed(context, addContactRoute),
               );
               case 1: return _renderIconEntry(
                 Icons.group_add,
-                'Create groupchat',
+                t.pages.newconversation.createGroupchat,
                 () => showNotImplementedDialog('groupchat', context),
               );
               default:

lib/ui/pages/profile/conversationheader.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:get_it/get_it.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/models/conversation.dart';
+import 'package:moxxyv2/ui/bloc/devices_bloc.dart';
 import 'package:moxxyv2/ui/bloc/profile_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/helpers.dart';
@@ -9,8 +11,7 @@ import 'package:moxxyv2/ui/widgets/chat/shared/base.dart';
 //import 'package:phosphor_flutter/phosphor_flutter.dart';
 
 class ConversationProfileHeader extends StatelessWidget {
-
-  const ConversationProfileHeader(this.conversation, { Key? key }) : super(key: key);
+  const ConversationProfileHeader(this.conversation, { super.key });
   final Conversation conversation;
 
   @override
@@ -55,8 +56,8 @@ class ConversationProfileHeader extends StatelessWidget {
             children: [
               Tooltip(
                 message: conversation.muted ?
-                  'Unmute chat' :
-                  'Mute chat',
+                  t.pages.profile.conversation.unmuteChatTooltip :
+                  t.pages.profile.conversation.muteChatTooltip,
                 child: Column(
                   mainAxisSize: MainAxisSize.min,
                   children: [
@@ -84,8 +85,38 @@ class ConversationProfileHeader extends StatelessWidget {
                     ),
                     Text(
                       conversation.muted ?
-                        'Unmute' :
-                        'Mute',
+                        t.pages.profile.conversation.unmuteChat :
+                        t.pages.profile.conversation.muteChat,
+                      style: const TextStyle(
+                        fontSize: fontsizeAppbar,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+              // TODO(PapaTutuWawa): Only show when the chat partner has OMEMO keys
+              Tooltip(
+                message: t.pages.profile.conversation.devices,
+                child: Column(
+                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                  children: [
+                    SharedMediaContainer(
+                      ClipRRect(
+                        borderRadius: BorderRadius.circular(10),
+                        child: ColoredBox(
+                          color: getTileColor(context),
+                          child: const Icon(
+                            Icons.security_outlined,
+                            size: 32,
+                          ),
+                        ),
+                      ),
+                      onTap: () {
+                        GetIt.I.get<DevicesBloc>().add(DevicesRequestedEvent(conversation.jid));
+                      },
+                    ),
+                    Text(
+                      t.pages.profile.conversation.devices,
                       style: const TextStyle(
                         fontSize: fontsizeAppbar,
                       ),

lib/ui/pages/profile/devices.dart

@@ -0,0 +1,104 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
+import 'package:moxxyv2/ui/bloc/devices_bloc.dart';
+import 'package:moxxyv2/ui/constants.dart';
+import 'package:moxxyv2/ui/helpers.dart';
+import 'package:moxxyv2/ui/pages/profile/widgets.dart';
+import 'package:moxxyv2/ui/widgets/topbar.dart';
+
+enum DevicesOptions {
+  recreateSessions,
+}
+
+class DevicesPage extends StatelessWidget {
+  const DevicesPage({ super.key });
+
+  static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
+    builder: (context) => const DevicesPage(),
+    settings: const RouteSettings(
+      name: devicesRoute,
+    ),
+  );
+  
+  Widget _buildBody(BuildContext context, DevicesState state) {
+    if (state.working) {
+      return const Center(
+        child: CircularProgressIndicator(),
+      );
+    }
+
+    final hasVerifiedDevices = state.devices.any((item) => item.verified);
+    return ListView.builder(
+      itemCount: state.devices.length,
+      itemBuilder: (context, index) {
+        final item = state.devices[index];
+        final fingerprint = item.fingerprint;
+
+        return FingerprintListItem(
+          fingerprint,
+          item.enabled,
+          item.verified,
+          hasVerifiedDevices,
+          onVerifiedPressed: () {
+            if (item.verified) return;
+
+            // TODO(PapaTutuWawa): Implement
+            showNotImplementedDialog('verification feature', context);
+          },
+          onEnableValueChanged: (value) {
+            context.read<DevicesBloc>().add(
+              DeviceEnabledSetEvent(
+                item.deviceId,
+                value,
+              ),
+            );
+          },
+        );
+      },
+    );
+  }
+
+  Future<void> _recreateSessions(BuildContext context) async {
+    final result = await showConfirmationDialog(
+      t.pages.profile.devices.recreateSessionsConfirmTitle,
+      t.pages.profile.devices.recreateSessionsConfirmBody,
+      context,
+    );
+
+    if (result) {
+      // ignore: use_build_context_synchronously
+      context.read<DevicesBloc>().add(SessionsRecreatedEvent());
+    }
+  }
+  
+  @override
+  Widget build(BuildContext context) {
+    return BlocBuilder<DevicesBloc, DevicesState>(
+      builder: (context, state) => Scaffold(
+        appBar: BorderlessTopbar.simple(
+          t.pages.profile.devices.title,
+          extra: [
+            const Spacer(),
+            PopupMenuButton(
+              onSelected: (DevicesOptions result) {
+                if (result == DevicesOptions.recreateSessions) {
+                  _recreateSessions(context);
+                }
+              },
+              icon: const Icon(Icons.more_vert),
+              itemBuilder: (BuildContext context) => [
+                PopupMenuItem(
+                  value: DevicesOptions.recreateSessions,
+                  enabled: state.devices.isNotEmpty,
+                  child: Text(t.pages.profile.devices.recreateSessions),
+                )
+              ],
+            ),
+          ],
+        ),
+        body: _buildBody(context, state),
+      ),
+    );
+  }
+}

lib/ui/pages/profile/own_devices.dart

@@ -0,0 +1,222 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:get_it/get_it.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
+import 'package:moxxyv2/ui/bloc/own_devices_bloc.dart';
+import 'package:moxxyv2/ui/constants.dart';
+import 'package:moxxyv2/ui/helpers.dart';
+import 'package:moxxyv2/ui/pages/profile/widgets.dart';
+import 'package:moxxyv2/ui/service/data.dart';
+import 'package:moxxyv2/ui/widgets/topbar.dart';
+import 'package:qr_flutter/qr_flutter.dart';
+
+enum OwnDevicesOptions {
+  recreateSessions,
+  recreateDevice,
+}
+
+class OwnDevicesPage extends StatelessWidget {
+  const OwnDevicesPage({ super.key });
+
+  static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
+    builder: (context) => const OwnDevicesPage(),
+    settings: const RouteSettings(
+      name: ownDevicesRoute,
+    ),
+  );
+
+  Future<void> _showDeviceQRCode(BuildContext context, int deviceId, String fingerprint) async {
+    final jid = GetIt.I.get<UIDataService>().ownJid;
+    await showDialog<dynamic>(
+      context: context,
+      builder: (BuildContext context) => SimpleDialog(
+        children: [
+          Center(
+            child: SizedBox(
+              width: 220,
+              height: 220,
+              child: QrImage(
+                data: 'xmpp:$jid?omemo-sid-$deviceId=$fingerprint',
+                size: 220,
+                backgroundColor: Colors.white,
+                embeddedImage: const AssetImage('assets/images/logo.png'),
+                embeddedImageStyle: QrEmbeddedImageStyle(
+                  size: const Size(50, 50),
+                ),
+              ),
+            ),
+          ) 
+        ],
+      ),
+    );
+  }
+  
+  Widget _buildBody(BuildContext context, OwnDevicesState state) {
+    if (state.working) {
+      return const Center(
+        child: CircularProgressIndicator(),
+      );
+    }
+
+    final hasVerifiedDevices = state.keys.any((item) => item.verified);
+    return ListView.builder(
+      itemCount: state.keys.length + 1,
+      itemBuilder: (context, index) {
+        if (index == 0) {
+          return Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Align(
+                alignment: Alignment.centerLeft,
+                child: Padding(
+                  padding: const EdgeInsets.only(
+                    left: 16,
+                  ),
+                  child: Text(
+                    t.pages.profile.owndevices.thisDevice,
+                    style: const TextStyle(
+                      fontSize: fontsizeSubtitle,
+                    ),
+                  ),
+                ),
+              ),
+              FingerprintListItem(
+                state.deviceFingerprint,
+                true,
+                true,
+                true,
+                onShowQrCodePressed: () {
+                  _showDeviceQRCode(context, state.deviceId, state.deviceFingerprint);
+                },
+              ),
+              ...state.keys.isNotEmpty ?
+                [
+                  Align(
+                    alignment: Alignment.centerLeft,
+                    child: Padding(
+                      padding: const EdgeInsets.only(
+                        top: 32,
+                        left: 16,
+                      ),
+                      child: Text(
+                        t.pages.profile.owndevices.otherDevices,
+                        style: const TextStyle(
+                          fontSize: fontsizeSubtitle,
+                        ),
+                      ),
+                    ),
+                  ),
+                ] :
+                [],
+            ],
+          );
+        }
+
+        final item = state.keys[index - 1];
+        final fingerprint = item.fingerprint;
+        
+        return FingerprintListItem(
+          fingerprint,
+          item.enabled,
+          item.verified,
+          hasVerifiedDevices,
+          onVerifiedPressed: !item.hasSessionWith ?
+            null :
+            () {
+              if (item.verified) return;
+
+              // TODO(PapaTutuWawa): Implement
+              showNotImplementedDialog('verification feature', context);
+            },
+          onEnableValueChanged: !item.hasSessionWith ?
+            null :
+            (value) {
+              context.read<OwnDevicesBloc>().add(
+                OwnDeviceEnabledSetEvent(
+                  item.deviceId,
+                  value,
+                ),
+              );
+            },
+          onDeletePressed: () async {
+            final result = await showConfirmationDialog(
+              t.pages.profile.owndevices.deleteDeviceConfirmTitle,
+              t.pages.profile.owndevices.deleteDeviceConfirmBody,
+              context,
+            );
+
+            if (result) {
+              // ignore: use_build_context_synchronously
+              context.read<OwnDevicesBloc>().add(OwnDeviceRemovedEvent(item.deviceId));
+            }
+          },
+        );
+      },
+    );
+  }
+
+  Future<void> _recreateSessions(BuildContext context) async {
+    final result = await showConfirmationDialog(
+      t.pages.profile.owndevices.recreateOwnSessionsConfirmTitle,
+      t.pages.profile.owndevices.recreateOwnSessionsConfirmBody,
+      context,
+    );
+
+    if (result) {
+      // ignore: use_build_context_synchronously
+      context.read<OwnDevicesBloc>().add(OwnSessionsRecreatedEvent());
+    }
+  }
+
+  Future<void> _recreateDevice(BuildContext context) async {
+    final result = await showConfirmationDialog(
+      t.pages.profile.owndevices.recreateOwnDeviceConfirmTitle,
+      t.pages.profile.owndevices.recreateOwnDeviceConfirmBody,
+      context,
+    );
+
+    if (result) {
+      // ignore: use_build_context_synchronously
+      context.read<OwnDevicesBloc>().add(OwnDeviceRegeneratedEvent());
+    }
+  }
+  
+  @override
+  Widget build(BuildContext context) {
+    return BlocBuilder<OwnDevicesBloc, OwnDevicesState>(
+      builder: (context, state) => Scaffold(
+        appBar: BorderlessTopbar.simple(
+          t.pages.profile.owndevices.title,
+          extra: [
+            const Spacer(),
+            PopupMenuButton(
+              onSelected: (OwnDevicesOptions result) {
+                switch (result) {
+                  case OwnDevicesOptions.recreateSessions:
+                    _recreateSessions(context);
+                    break;
+                  case OwnDevicesOptions.recreateDevice:
+                    _recreateDevice(context);
+                    break;
+                }
+              },
+              icon: const Icon(Icons.more_vert),
+              itemBuilder: (BuildContext context) => [
+                PopupMenuItem(
+                  value: OwnDevicesOptions.recreateSessions,
+                  enabled: state.keys.isNotEmpty,
+                  child: Text(t.pages.profile.owndevices.recreateOwnSessions),
+                ),
+                PopupMenuItem(
+                  value: OwnDevicesOptions.recreateDevice,
+                  child: Text(t.pages.profile.owndevices.recreateOwnDevice),
+                ),
+              ],
+            ),
+          ],
+        ),
+        body: _buildBody(context, state),
+      ),
+    );
+  }
+}

lib/ui/pages/profile/profile.dart

@@ -9,7 +9,7 @@ import 'package:moxxyv2/ui/pages/profile/selfheader.dart';
 import 'package:moxxyv2/ui/widgets/chat/shared/media.dart';
 
 class ProfilePage extends StatelessWidget {
-  const ProfilePage({ Key? key }) : super(key: key);
+  const ProfilePage({ super.key });
  
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const ProfilePage(),

lib/ui/pages/profile/selfheader.dart

@@ -1,6 +1,11 @@
 import 'package:flutter/material.dart';
+import 'package:get_it/get_it.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
+import 'package:moxxyv2/ui/bloc/own_devices_bloc.dart';
+import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/helpers.dart';
 import 'package:moxxyv2/ui/widgets/avatar.dart';
+import 'package:moxxyv2/ui/widgets/chat/shared/base.dart';
 import 'package:qr_flutter/qr_flutter.dart';
 
 class SelfProfileHeader extends StatelessWidget {
@@ -10,10 +15,8 @@ class SelfProfileHeader extends StatelessWidget {
     this.avatarUrl,
     this.displayName,
     this.setAvatar,
-    {
-      Key? key,
-    }
-  ) : super(key: key);
+    { super.key, }
+  );
   final String jid;
   final String avatarUrl;
   final String displayName;
@@ -103,6 +106,43 @@ class SelfProfileHeader extends StatelessWidget {
             ],
           ),
         ),
+        Padding(
+          padding: const EdgeInsets.only(top: 16),
+          child: Row(
+            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+            children: [
+              Tooltip(
+                message: t.pages.profile.self.devices,
+                child: Column(
+                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                  children: [
+                    SharedMediaContainer(
+                      ClipRRect(
+                        borderRadius: BorderRadius.circular(10),
+                        child: ColoredBox(
+                          color: getTileColor(context),
+                          child: const Icon(
+                            Icons.security_outlined,
+                            size: 32,
+                          ),
+                        ),
+                      ),
+                      onTap: () {
+                        GetIt.I.get<OwnDevicesBloc>().add(OwnDevicesRequestedEvent());
+                      },
+                    ),
+                    Text(
+                      t.pages.profile.self.devices,
+                      style: const TextStyle(
+                        fontSize: fontsizeAppbar,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
       ],
     );
   }

lib/ui/pages/profile/widgets.dart

@@ -0,0 +1,108 @@
+import 'package:flutter/material.dart';
+import 'package:moxxyv2/ui/constants.dart';
+
+class FingerprintListItem extends StatelessWidget {
+  const FingerprintListItem(
+    this.fingerprint,
+    this.enabled,
+    this.verified,
+    this.hasVerifiedKeys,
+    {
+      this.onVerifiedPressed,
+      this.onEnableValueChanged,
+      this.onShowQrCodePressed,
+      this.onDeletePressed,
+      super.key,
+    }
+  );
+  final String fingerprint;
+  final bool enabled;
+  final bool verified;
+  final bool hasVerifiedKeys;
+  final void Function()? onVerifiedPressed;
+  final void Function(bool value)? onEnableValueChanged;
+  final void Function()? onShowQrCodePressed;
+  final void Function()? onDeletePressed;
+  
+  @override
+  Widget build(BuildContext context) {
+    final parts = List<String>.empty(growable: true);
+    for (var i = 0; i < 8; i++) {
+      final part = fingerprint.substring(i*8, (i+1)*8);
+      parts.add(part);
+    }
+
+    final width = MediaQuery.of(context).size.width;
+    final fontSize = width * 0.04;
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 8),
+      child: Card(
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(textfieldRadiusRegular),
+        ),
+        color: !verified && hasVerifiedKeys ? Colors.red : null,
+        child: Padding(
+          padding: const EdgeInsets.all(8),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Wrap(
+                spacing: 6,
+                children: parts
+                .map((part_) => Text(
+                  part_,
+                  style: TextStyle(
+                    fontFamily: 'RobotoMono',
+                    fontSize: fontSize,
+                  ),
+                ),).toList(),
+              ),
+              Row(
+                mainAxisAlignment: MainAxisAlignment.end,
+                children: [
+                  ...onEnableValueChanged != null ?
+                    [
+                      Switch(
+                        value: enabled,
+                        onChanged: onEnableValueChanged,
+                      ),
+                    ] :
+                    [],
+                  ...onVerifiedPressed != null ?
+                    [
+                      IconButton(
+                        icon: Icon(
+                          verified ?
+                            Icons.verified_user :
+                            Icons.qr_code_scanner,
+                        ),
+                        onPressed: onVerifiedPressed,
+                      ),
+                    ] :
+                    [],
+                  ...onShowQrCodePressed != null ?
+                    [
+                      IconButton(
+                        icon: const Icon(Icons.qr_code),
+                        onPressed: onShowQrCodePressed,
+                      ),
+                    ] :
+                    [],
+                  ...onDeletePressed != null ?
+                    [
+                      IconButton(
+                        icon: const Icon(Icons.delete),
+                        onPressed: onDeletePressed,
+                      ),
+                    ] :
+                    [],
+                ],
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/ui/pages/sendfiles.dart

@@ -10,7 +10,6 @@ import 'package:moxxyv2/ui/widgets/cancel_button.dart';
 import 'package:moxxyv2/ui/widgets/chat/shared/base.dart';
 import 'package:moxxyv2/ui/widgets/chat/shared/image.dart';
 import 'package:moxxyv2/ui/widgets/chat/shared/video.dart';
-import 'package:moxxyv2/ui/widgets/chat/thumbnail.dart';
 import 'package:path/path.dart' as pathlib;
 
 Widget _deleteIconWithShadow() {
@@ -24,8 +23,7 @@ Widget _deleteIconWithShadow() {
 }
 
 class SendFilesPage extends StatelessWidget {
- 
-  const SendFilesPage({ Key? key }) : super(key: key);
+  const SendFilesPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (context) => const SendFilesPage(),
@@ -126,14 +124,14 @@ class SendFilesPage extends StatelessWidget {
       return Image.file(
         File(path),
       );
-    } else if (mime.startsWith('video/')) {
+    } /*else if (mime.startsWith('video/')) {
       // Render the video thumbnail
       // TODO(PapaTutuWawa): Maybe allow playing the video back inline
       return VideoThumbnailWidget(
         path,
         Image.memory,
       );
-    } else {
+    }*/ else {
       // Generic file
       final width = MediaQuery.of(context).size.width;
       return Center(

lib/ui/pages/server_info.dart

@@ -9,7 +9,7 @@ const TextStyle _labelStyle = TextStyle(
 );
 
 class ServerInfoPage extends StatelessWidget {
-  const ServerInfoPage({ Key? key }) : super(key: key);
+  const ServerInfoPage({ super.key });
  
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const ServerInfoPage(),

lib/ui/pages/settings/about.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
 import 'package:url_launcher/url_launcher.dart';
@@ -6,7 +7,7 @@ import 'package:url_launcher/url_launcher.dart';
 // TODO(PapaTutuWawa): Include license text
 // TODO(Unknown): Maybe include the version number
 class SettingsAboutPage extends StatelessWidget {
-  const SettingsAboutPage({ Key? key }) : super(key: key);
+  const SettingsAboutPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const SettingsAboutPage(),
@@ -16,7 +17,7 @@ class SettingsAboutPage extends StatelessWidget {
   );
   
   Future<void> _openUrl(String url) async {
-    if (!await launchUrl(Uri.parse(url))) {
+    if (!await launchUrl(Uri.parse(url), mode: LaunchMode.externalApplication)) {
       // TODO(Unknown): Show a popup to copy the url
     }
   }
@@ -24,7 +25,7 @@ class SettingsAboutPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: BorderlessTopbar.simple('About'),
+      appBar: BorderlessTopbar.simple(t.pages.settings.about.title),
       body: Padding(
         padding: const EdgeInsets.symmetric(horizontal: paddingVeryLarge),
         child: Column(
@@ -33,26 +34,26 @@ class SettingsAboutPage extends StatelessWidget {
               'assets/images/logo.png',
               width: 200, height: 200,
             ),
-            const Text(
-              'moxxy',
-              style: TextStyle(
+            Text(
+              t.global.title,
+              style: const TextStyle(
                 fontSize: 40,
               ),
             ),
-            const Padding(
-              padding: EdgeInsets.symmetric(vertical: 8),
+            Padding(
+              padding: const EdgeInsets.symmetric(vertical: 8),
               child: Text(
-                'An experimental XMPP client that is beautiful, modern and easy to use',
-                style: TextStyle(
+                t.global.moxxySubtitle,
+                style: const TextStyle(
                   fontSize: 15,
                 ),
               ),
             ),
-            const Text('Licensed under GPL3'),
+            Text(t.pages.settings.about.licensed),
             Padding(
               padding: const EdgeInsets.symmetric(vertical: 8),
               child: ElevatedButton(
-                child: const Text('View source code'),
+                child: Text(t.pages.settings.about.viewSourceCode),
                 onPressed: () => _openUrl('https://github.com/PapaTutuWawa/moxxyv2'),
               ),
             ) 

lib/ui/pages/settings/appearance/appearance.dart

@@ -0,0 +1,105 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
+import 'package:moxxyv2/shared/models/preferences.dart';
+import 'package:moxxyv2/ui/bloc/preferences_bloc.dart';
+import 'package:moxxyv2/ui/constants.dart';
+import 'package:moxxyv2/ui/helpers.dart';
+import 'package:moxxyv2/ui/widgets/topbar.dart';
+import 'package:settings_ui/settings_ui.dart';
+
+Widget _buildLanguageOption(BuildContext context, String localeCode, PreferencesState state) {
+  final selected = state.languageLocaleCode == localeCode;
+  return SimpleDialogOption(
+    onPressed: () => Navigator.pop(context, localeCode),
+    child: Flex(
+      direction: Axis.horizontal,
+      children: [
+        Text(
+          localeCodeToLanguageName(localeCode),
+          style: const TextStyle(
+            fontSize: 16,
+          ),
+        ),
+        ...selected ? [
+          const Spacer(),
+          const Icon(Icons.check),
+        ] : [],
+      ],
+    ),
+  );
+}
+
+class AppearanceSettingsPage extends StatelessWidget {
+  const AppearanceSettingsPage({ super.key });
+
+  static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
+    builder: (_) => const AppearanceSettingsPage(),
+    settings: const RouteSettings(
+      name: appearanceRoute,
+    ),
+  );
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: BorderlessTopbar.simple(t.pages.settings.appearance.title),
+      body: BlocBuilder<PreferencesBloc, PreferencesState>(
+        builder: (context, state) => SettingsList(
+          sections: [
+            SettingsSection(
+              title: Text(t.pages.settings.appearance.languageSection),
+              tiles: [
+                SettingsTile(
+                  title: Text(t.pages.settings.appearance.language),
+                  description: Text(
+                    t.pages.settings.appearance.languageSubtext(
+                      selectedLanguage: localeCodeToLanguageName(state.languageLocaleCode),
+                    ),
+                  ),
+                  onPressed: (context) async {
+                    final result = await showDialog<String>(
+                      context: context,
+                      builder: (context) {
+                        return SimpleDialog(
+                          shape: RoundedRectangleBorder(
+                            borderRadius: BorderRadius.circular(textfieldRadiusRegular),
+                          ),
+                          title: Text(t.pages.settings.appearance.language),
+                          children: [
+                            _buildLanguageOption(context, 'default', state),
+                            _buildLanguageOption(context, 'de', state),
+                            _buildLanguageOption(context, 'en', state),
+                          ],
+                        );
+                      },
+                    );
+
+                    if (result == null) {
+                      // Do nothing as the dialog was dismissed
+                      return;
+                    }
+
+                    // Change preferences and set the app's locale
+                    // ignore: use_build_context_synchronously
+                    context.read<PreferencesBloc>().add(
+                      PreferencesChangedEvent(
+                        state.copyWith(languageLocaleCode: result),
+                      ),
+                    );
+
+                    if (result == 'default') {
+                      LocaleSettings.useDeviceLocale();
+                    } else {
+                      LocaleSettings.setLocaleRaw(result);
+                    }
+                  },
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/ui/pages/settings/appearance/cropbackground.dart

@@ -9,8 +9,7 @@ import 'package:moxxyv2/ui/widgets/button.dart';
 import 'package:moxxyv2/ui/widgets/cancel_button.dart';
 
 class CropBackgroundPage extends StatefulWidget {
-
-  const CropBackgroundPage({ Key? key }) : super(key: key);
+  const CropBackgroundPage({ super.key });
   
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (context) => const CropBackgroundPage(),
@@ -205,11 +204,8 @@ class CropBackgroundPageState extends State<CropBackgroundPage> {
                       mainAxisAlignment: MainAxisAlignment.center,
                       children: [
                         RoundedButton(
-                          color: primaryColor,
                           cornerRadius: 100,
                           onTap: () {
-                            if (state.isWorking) return;
-
                             context.read<CropBackgroundBloc>().add(
                               BackgroundSetEvent(
                                 _x,
@@ -220,6 +216,7 @@ class CropBackgroundPageState extends State<CropBackgroundPage> {
                               ),
                             );
                           },
+                          enabled: !state.isWorking,
                           child: const Text('Set as background image'),
                         ),
                       ],

lib/ui/pages/settings/conversation.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/models/preferences.dart';
 import 'package:moxxyv2/ui/bloc/cropbackground_bloc.dart';
 import 'package:moxxyv2/ui/bloc/preferences_bloc.dart';
@@ -14,8 +15,7 @@ import 'package:path_provider/path_provider.dart';
 import 'package:settings_ui/settings_ui.dart';
 
 class ConversationSettingsPage extends StatelessWidget {
-
-  const ConversationSettingsPage({ Key? key }): super(key: key);
+  const ConversationSettingsPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const ConversationSettingsPage(),
@@ -64,16 +64,16 @@ class ConversationSettingsPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: BorderlessTopbar.simple('Chat'),
+      appBar: BorderlessTopbar.simple(t.pages.settings.conversation.title),
       body: BlocBuilder<PreferencesBloc, PreferencesState>(
         builder: (context, state) => SettingsList(
           sections: [
             SettingsSection(
-              title: const Text('Appearance'),
+              title: Text(t.pages.settings.conversation.appearance),
               tiles: [
                 SettingsTile(
-                  title: const Text('Select background image'),
-                  description: const Text('This image will be the background of all your chats'),
+                  title: Text(t.pages.settings.conversation.selectBackgroundImage),
+                  description: Text(t.pages.settings.conversation.selectBackgroundImageDescription),
                   onPressed: (context) async {
                     final backgroundPath = await _pickBackgroundImage();
 
@@ -86,27 +86,27 @@ class ConversationSettingsPage extends StatelessWidget {
                   },
                 ),
                 SettingsTile(
-                  title: const Text('Remove background image'),
-                  onPressed: (context) {
-                    showConfirmationDialog(
-                      'Are you sure?',
-                      'Are you sure you want to remove your conversation background image?',
+                  title: Text(t.pages.settings.conversation.removeBackgroundImage),
+                  onPressed: (context) async {
+                    final result = await showConfirmationDialog(
+                      t.pages.settings.conversation.removeBackgroundImageConfirmTitle,
+                      t.pages.settings.conversation.removeBackgroundImageConfirmBody,
                       context,
-                      () async {
-                        await _removeBackgroundImage(context, state);
-                        // ignore: use_build_context_synchronously
-                        Navigator.of(context).pop();
-                      }
                     );
+
+                    if (result) {
+                      // ignore: use_build_context_synchronously
+                      await _removeBackgroundImage(context, state);
+                    }
                   },
                 ),
               ],
             ),
             SettingsSection(
-              title: const Text('New Conversations'),
+              title: Text(t.pages.settings.conversation.newChatsSection),
               tiles: [
                 SettingsTile.switchTile(
-                  title: const Text('Mute new chats by default'),
+                  title: Text(t.pages.settings.conversation.newChatsMuteByDefault),
                   initialValue: state.defaultMuteState,
                   onToggle: (value) => context.read<PreferencesBloc>().add(
                     PreferencesChangedEvent(
@@ -114,6 +114,15 @@ class ConversationSettingsPage extends StatelessWidget {
                     ),
                   ),
                 ),
+                SettingsTile.switchTile(
+                  title: Text(t.pages.settings.conversation.newChatsE2EE),
+                  initialValue: state.enableOmemoByDefault,
+                  onToggle: (value) => context.read<PreferencesBloc>().add(
+                    PreferencesChangedEvent(
+                      state.copyWith(enableOmemoByDefault: value),
+                    ),
+                  ),
+                ),
               ],
             ),
           ],

lib/ui/pages/settings/debugging.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/models/preferences.dart';
 import 'package:moxxyv2/ui/bloc/preferences_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
@@ -7,8 +8,10 @@ import 'package:moxxyv2/ui/widgets/topbar.dart';
 import 'package:settings_ui/settings_ui.dart';
 
 class DebuggingPage extends StatelessWidget {
-
-  DebuggingPage({ Key? key }) : _ipController = TextEditingController(), _passphraseController = TextEditingController(), _portController = TextEditingController(), super(key: key);
+  DebuggingPage({ super.key })
+    : _ipController = TextEditingController(),
+      _passphraseController = TextEditingController(),
+      _portController = TextEditingController();
   final TextEditingController _ipController;
   final TextEditingController _portController;
   final TextEditingController _passphraseController;
@@ -23,15 +26,15 @@ class DebuggingPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: BorderlessTopbar.simple('Debugging'),
+      appBar: BorderlessTopbar.simple(t.pages.settings.debugging.title),
       body: BlocBuilder<PreferencesBloc, PreferencesState>(
         builder: (context, state) => SettingsList(
           sections: [
             SettingsSection(
-              title: const Text('General'),
+              title: Text(t.pages.settings.debugging.generalSection),
               tiles: [
                 SettingsTile.switchTile(
-                  title: const Text('Enable debugging'),
+                  title: Text(t.pages.settings.debugging.generalEnableDebugging),
                   onToggle: (value) => context.read<PreferencesBloc>().add(
                     PreferencesChangedEvent(
                       state.copyWith(debugEnabled: value),
@@ -40,14 +43,14 @@ class DebuggingPage extends StatelessWidget {
                   initialValue: state.debugEnabled,
                 ),
                 SettingsTile(
-                  title: const Text('Encryption password'),
-                  description: const Text('The logs may contain sensitive information so pick a strong passphrase'),
+                  title: Text(t.pages.settings.debugging.generalEncryptionPassword),
+                  description: Text(t.pages.settings.debugging.generalEncryptionPasswordSubtext),
                   onPressed: (context) {
                     showDialog<void>(
                       context: context,
                       barrierDismissible: true,
                       builder: (BuildContext context) => AlertDialog(
-                        title: const Text('Debug Passphrase'),
+                        title: Text(t.pages.settings.debugging.generalEncryptionPassword),
                         content: TextField(
                           minLines: 1,
                           obscureText: true,
@@ -55,7 +58,7 @@ class DebuggingPage extends StatelessWidget {
                         ),
                         actions: [
                           TextButton(
-                            child: const Text('Okay'),
+                            child: Text(t.global.dialogAccept),
                             onPressed: () {
                               context.read<PreferencesBloc>().add(
                                 PreferencesChangedEvent(
@@ -71,21 +74,21 @@ class DebuggingPage extends StatelessWidget {
                   },
                 ),
                 SettingsTile(
-                  title: const Text('Logging IP'),
-                  description: const Text('The IP the logs should be sent to'),
+                  title: Text(t.pages.settings.debugging.generalLoggingIp),
+                  description: Text(t.pages.settings.debugging.generalLoggingIpSubtext),
                   onPressed: (context) {
                     showDialog<void>(
                       context: context,
                       barrierDismissible: true,
                       builder: (BuildContext context) => AlertDialog(
-                        title: const Text('Logging IP'),
+                        title: Text(t.pages.settings.debugging.generalLoggingIp),
                         content: TextField(
                           minLines: 1,
                           controller: _ipController,
                         ),
                         actions: [
                           TextButton(
-                            child: const Text('Okay'),
+                            child: Text(t.global.dialogAccept),
                             onPressed: () {
                               context.read<PreferencesBloc>().add(
                                 PreferencesChangedEvent(
@@ -101,14 +104,14 @@ class DebuggingPage extends StatelessWidget {
                   },
                 ),
                 SettingsTile(
-                  title: const Text('Logging Port'),
-                  description: const Text('The Port the logs should be sent to'),
+                  title: Text(t.pages.settings.debugging.generalLoggingPort),
+                  description: Text(t.pages.settings.debugging.generalLoggingPortSubtext),
                   onPressed: (context) {
                     showDialog<void>(
                       context: context,
                       barrierDismissible: true,
                       builder: (BuildContext context) => AlertDialog(
-                        title: const Text('Logging Port'),
+                        title: Text(t.pages.settings.debugging.generalLoggingPort),
                         content: TextField(
                           minLines: 1,
                           controller: _portController,
@@ -116,7 +119,7 @@ class DebuggingPage extends StatelessWidget {
                         ),
                         actions: [
                           TextButton(
-                            child: const Text('Okay'),
+                            child: Text(t.global.dialogAccept),
                             onPressed: () {
                               context.read<PreferencesBloc>().add(
                                 PreferencesChangedEvent(

lib/ui/pages/settings/licenses.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/ui/constants.dart';
 import 'package:moxxyv2/ui/widgets/topbar.dart';
 import 'package:url_launcher/url_launcher.dart';
@@ -14,8 +15,7 @@ class Library {
 }
 
 class LicenseRow extends StatelessWidget {
-
-  const LicenseRow({ required this.library, Key? key }) : super(key: key);
+  const LicenseRow({ required this.library, super.key });
   final Library library;
 
   Future<void> _openUrl() async {
@@ -32,14 +32,14 @@ class LicenseRow extends StatelessWidget {
   Widget build(BuildContext context) {
     return ListTile(
       title: Text(library.name),
-      subtitle: Text('Licensed under ${library.license}'),
+      subtitle: Text(t.pages.settings.licenses.licensedUnder(license: library.license)),
       onTap: _openUrl,
    );
   }
 }
 
 class SettingsLicensesPage extends StatelessWidget {
-  const SettingsLicensesPage({ Key? key }) : super(key: key);
+  const SettingsLicensesPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const SettingsLicensesPage(),
@@ -51,7 +51,7 @@ class SettingsLicensesPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: BorderlessTopbar.simple('Licenses'),
+      appBar: BorderlessTopbar.simple(t.pages.settings.licenses.title),
       body: ListView.builder(
         itemCount: usedLibraryList.length,
         itemBuilder: (context, index) => LicenseRow(library: usedLibraryList[index]),

lib/ui/pages/settings/network.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:moxxyv2/i18n/strings.g.dart';
 import 'package:moxxyv2/shared/models/preferences.dart';
 import 'package:moxxyv2/ui/bloc/preferences_bloc.dart';
 import 'package:moxxyv2/ui/constants.dart';
@@ -22,8 +23,7 @@ const _autoDownloadSizes = <_AutoDownloadSizes>[
 ];
 
 class NetworkPage extends StatelessWidget {
-
-  const NetworkPage({ Key? key }): super(key: key);
+  const NetworkPage({ super.key });
 
   static MaterialPageRoute<dynamic> get route => MaterialPageRoute<dynamic>(
     builder: (_) => const NetworkPage(),
@@ -67,18 +67,18 @@ class NetworkPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: BorderlessTopbar.simple('Network'),
+      appBar: BorderlessTopbar.simple(t.pages.settings.network.title),
       body: BlocBuilder<PreferencesBloc, PreferencesState>(
         builder: (context, state) => SettingsList(
           sections: [
             SettingsSection(
-              title: const Text('Automatic Downloads'),
+              title: Text(t.pages.settings.network.automaticDownloadsSection),
               tiles: [
                 SettingsTile(
-                  title: const Text('Moxxy will automatically download files on...'),
+                  title: Text(t.pages.settings.network.automaticDownloadsText),
                 ),
                 SettingsTile.switchTile(
-                  title: const Text('Wifi'),
+                  title: Text(t.pages.settings.network.wifi),
                   initialValue: state.autoDownloadWifi,
                   onToggle: (value) => context.read<PreferencesBloc>().add(
                     PreferencesChangedEvent(
@@ -87,7 +87,7 @@ class NetworkPage extends StatelessWidget {
                   ),
                 ),
                 SettingsTile.switchTile(
-                  title: const Text('Mobile Data'),
+                  title: Text(t.pages.settings.network.mobileData),
                   initialValue: state.autoDownloadMobile,
                   onToggle: (value) => context.read<PreferencesBloc>().add(
                     PreferencesChangedEvent(
@@ -96,8 +96,8 @@ class NetworkPage extends StatelessWidget {
                   ),
                 ),
                 SettingsTile(
-                  title: const Text('Maximum Download Size'),
-                  description: const Text('The maximum file size for a file to be automatically downloaded'),
+                  title: Text(t.pages.settings.network.automaticDownloadsMaximumSize),
+                  description: Text(t.pages.settings.network.automaticDownloadsMaximumSizeSubtext),
                   onPressed: (context) {
                     showModalBottomSheet<dynamic>(
                       context: context,