Merge pull request 'Replace StanzaHandlerData with something more extensible' (#42) from feat/type-map-rework into master

Reviewed-on: https://codeberg.org/moxxy/moxxmpp/pulls/42

packages/moxxmpp/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 0.3.2
+## 0.4.0
 
 - **BREAKING**: Remove `lastResource` from `XmppConnection`'s `connect` method. Instead, set the `StreamManagementNegotiator`'s `resource` attribute instead. Since the resource can only really be restored by stream management, this is no issue.
 - **BREAKING**: Changed order of parameters of `CryptographicHashManager.hashFromData`
@@ -11,6 +11,11 @@
 - **BREAKING**: `PubSubManager` and `UserAvatarManager` now use `JID` instead of `String`.
 - **BREAKING**: `XmppConnection.sendStanza` not only takes a `StanzaDetails` argument.
 - Sent stanzas are now kept in a queue until sent.
+- **BREAKING**: `MessageManager.sendMessage` does not use `MessageDetails` anymore. Instead, use `TypedMap`.
+- `MessageManager` now allows registering callbacks for adding data whenever a message is sent.
+- **BREAKING**: `MessageEvent` now makes use of `TypedMap`.
+- **BREAKING**: Removed `PresenceReceivedEvent`. Use a manager registering handlers with priority greater than `[PresenceManager.presenceHandlerPriority]` instead.
+- **BREAKING**: `ChatState.toString()` is now `ChatState.toName()`
 
 ## 0.3.1
 

packages/moxxmpp/lib/moxxmpp.dart

@@ -18,7 +18,6 @@ export 'package:moxxmpp/src/managers/namespaces.dart';
 export 'package:moxxmpp/src/managers/priorities.dart';
 export 'package:moxxmpp/src/message.dart';
 export 'package:moxxmpp/src/namespaces.dart';
-export 'package:moxxmpp/src/negotiators/manager.dart';
 export 'package:moxxmpp/src/negotiators/namespaces.dart';
 export 'package:moxxmpp/src/negotiators/negotiator.dart';
 export 'package:moxxmpp/src/ping.dart';
@@ -40,6 +39,7 @@ export 'package:moxxmpp/src/socket.dart';
 export 'package:moxxmpp/src/stanza.dart';
 export 'package:moxxmpp/src/stringxml.dart';
 export 'package:moxxmpp/src/types/result.dart';
+export 'package:moxxmpp/src/util/typed_map.dart';
 export 'package:moxxmpp/src/xeps/staging/extensible_file_thumbnails.dart';
 export 'package:moxxmpp/src/xeps/staging/fast.dart';
 export 'package:moxxmpp/src/xeps/staging/file_upload_notification.dart';

packages/moxxmpp/lib/src/connection.dart

@@ -27,7 +27,9 @@ import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/types/result.dart';
 import 'package:moxxmpp/src/util/queue.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 import 'package:moxxmpp/src/xeps/xep_0030/xep_0030.dart';
+import 'package:moxxmpp/src/xeps/xep_0198/types.dart';
 import 'package:moxxmpp/src/xeps/xep_0198/xep_0198.dart';
 import 'package:moxxmpp/src/xeps/xep_0352.dart';
 import 'package:synchronized/synchronized.dart';
@@ -474,8 +476,8 @@ class XmppConnection {
       initial: StanzaHandlerData(
         false,
         false,
-        null,
         newStanza,
+        TypedMap(),
         encrypted: details.encrypted,
         forceEncryption: details.forceEncryption,
       ),
@@ -531,14 +533,15 @@ class XmppConnection {
 
     // Run post-send handlers
     _log.fine('Running post stanza handlers..');
+    final extensions = TypedMap<StanzaHandlerExtension>()
+      ..set(StreamManagementData(details.excludeFromStreamManagement));
     await _runOutgoingPostStanzaHandlers(
       newStanza,
       initial: StanzaHandlerData(
         false,
         false,
-        null,
         newStanza,
-        excludeFromStreamManagement: details.excludeFromStreamManagement,
+        extensions,
       ),
     );
     _log.fine('Done');
@@ -653,7 +656,7 @@ class XmppConnection {
     Stanza stanza, {
     StanzaHandlerData? initial,
   }) async {
-    var state = initial ?? StanzaHandlerData(false, false, null, stanza);
+    var state = initial ?? StanzaHandlerData(false, false, stanza, TypedMap());
     for (final handler in handlers) {
       if (handler.matches(state.stanza)) {
         state = await handler.callback(state.stanza, state);
@@ -728,7 +731,7 @@ class XmppConnection {
     // it.
     final incomingPreHandlers = await _runIncomingPreStanzaHandlers(stanza);
     final prefix = incomingPreHandlers.encrypted &&
-            incomingPreHandlers.other['encryption_error'] == null
+            incomingPreHandlers.encryptionError == null
         ? '(Encrypted) '
         : '';
     _log.finest('<== $prefix${incomingPreHandlers.stanza.toXml()}');
@@ -747,10 +750,10 @@ class XmppConnection {
       initial: StanzaHandlerData(
         false,
         incomingPreHandlers.cancel,
-        incomingPreHandlers.cancelReason,
         incomingPreHandlers.stanza,
+        incomingPreHandlers.extensions,
         encrypted: incomingPreHandlers.encrypted,
-        other: incomingPreHandlers.other,
+        cancelReason: incomingPreHandlers.cancelReason,
       ),
     );
     if (!incomingHandlers.done) {

packages/moxxmpp/lib/src/events.dart

@@ -4,19 +4,11 @@ import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/roster/roster.dart';
 import 'package:moxxmpp/src/stanza.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 import 'package:moxxmpp/src/xeps/xep_0030/types.dart';
 import 'package:moxxmpp/src/xeps/xep_0060/xep_0060.dart';
-import 'package:moxxmpp/src/xeps/xep_0066.dart';
 import 'package:moxxmpp/src/xeps/xep_0084.dart';
-import 'package:moxxmpp/src/xeps/xep_0085.dart';
-import 'package:moxxmpp/src/xeps/xep_0334.dart';
-import 'package:moxxmpp/src/xeps/xep_0359.dart';
-import 'package:moxxmpp/src/xeps/xep_0385.dart';
-import 'package:moxxmpp/src/xeps/xep_0424.dart';
-import 'package:moxxmpp/src/xeps/xep_0444.dart';
-import 'package:moxxmpp/src/xeps/xep_0446.dart';
-import 'package:moxxmpp/src/xeps/xep_0447.dart';
-import 'package:moxxmpp/src/xeps/xep_0461.dart';
+import 'package:moxxmpp/src/xeps/xep_0333.dart';
 
 abstract class XmppEvent {}
 
@@ -75,60 +67,42 @@ class RosterUpdatedEvent extends XmppEvent {
 
 /// Triggered when a message is received
 class MessageEvent extends XmppEvent {
-  MessageEvent({
-    required this.body,
-    required this.fromJid,
-    required this.toJid,
-    required this.sid,
-    required this.isCarbon,
-    required this.deliveryReceiptRequested,
-    required this.isMarkable,
-    required this.encrypted,
-    required this.other,
-    this.originId,
-    this.stanzaIds,
-    this.error,
+  MessageEvent(
+    this.from,
+    this.to,
+    this.id,
+    this.encrypted,
+    this.extensions, {
     this.type,
-    this.oob,
-    this.sfs,
-    this.sims,
-    this.reply,
-    this.chatState,
-    this.fun,
-    this.funReplacement,
-    this.funCancellation,
-    this.messageRetraction,
-    this.messageCorrectionId,
-    this.messageReactions,
-    this.messageProcessingHints,
-    this.stickerPackId,
+    this.error,
+    this.encryptionError,
   });
-  final StanzaError? error;
-  final String body;
-  final JID fromJid;
-  final JID toJid;
-  final String sid;
+
+  /// The from attribute of the message.
+  final JID from;
+
+  /// The to attribute of the message.
+  final JID to;
+
+  /// The id attribute of the message.
+  final String id;
+
+  /// The type attribute of the message.
   final String? type;
-  final String? originId;
-  final List<StanzaId>? stanzaIds;
-  final bool isCarbon;
-  final bool deliveryReceiptRequested;
-  final bool isMarkable;
-  final OOBData? oob;
-  final StatelessFileSharingData? sfs;
-  final StatelessMediaSharingData? sims;
-  final ReplyData? reply;
-  final ChatState? chatState;
-  final FileMetadataData? fun;
-  final String? funReplacement;
-  final String? funCancellation;
+
+  final StanzaError? error;
+
+  /// Flag indicating whether the message was encrypted.
   final bool encrypted;
-  final MessageRetractionData? messageRetraction;
-  final String? messageCorrectionId;
-  final MessageReactions? messageReactions;
-  final List<MessageProcessingHint>? messageProcessingHints;
-  final String? stickerPackId;
-  final Map<String, dynamic> other;
+
+  /// The error in case an encryption error occurred.
+  final Object? encryptionError;
+
+  /// Data added by other handlers.
+  final TypedMap<StanzaHandlerExtension> extensions;
+
+  /// Shorthand for extensions.get<T>().
+  T? get<T>() => extensions.get<T>();
 }
 
 /// Triggered when a client responds to our delivery receipt request
@@ -139,13 +113,19 @@ class DeliveryReceiptReceivedEvent extends XmppEvent {
 }
 
 class ChatMarkerEvent extends XmppEvent {
-  ChatMarkerEvent({
-    required this.type,
-    required this.from,
-    required this.id,
-  });
+  ChatMarkerEvent(
+    this.from,
+    this.type,
+    this.id,
+  );
+
+  /// The entity that sent the chat marker.
   final JID from;
-  final String type;
+
+  /// The type of chat marker that was sent.
+  final ChatMarker type;
+
+  /// The id of the message that the marker applies to.
   final String id;
 }
 
@@ -169,13 +149,6 @@ class ResourceBoundEvent extends XmppEvent {
   final String resource;
 }
 
-/// Triggered when we receive presence
-class PresenceReceivedEvent extends XmppEvent {
-  PresenceReceivedEvent(this.jid, this.presence);
-  final JID jid;
-  final Stanza presence;
-}
-
 /// Triggered when we are starting an connection attempt
 class ConnectingEvent extends XmppEvent {}
 

packages/moxxmpp/lib/src/managers/data.dart

@@ -1,82 +1,47 @@
-import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:moxxmpp/src/stanza.dart';
-import 'package:moxxmpp/src/xeps/xep_0066.dart';
-import 'package:moxxmpp/src/xeps/xep_0085.dart';
-import 'package:moxxmpp/src/xeps/xep_0203.dart';
-import 'package:moxxmpp/src/xeps/xep_0359.dart';
-import 'package:moxxmpp/src/xeps/xep_0380.dart';
-import 'package:moxxmpp/src/xeps/xep_0385.dart';
-import 'package:moxxmpp/src/xeps/xep_0424.dart';
-import 'package:moxxmpp/src/xeps/xep_0444.dart';
-import 'package:moxxmpp/src/xeps/xep_0446.dart';
-import 'package:moxxmpp/src/xeps/xep_0447.dart';
-import 'package:moxxmpp/src/xeps/xep_0461.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-part 'data.freezed.dart';
+abstract class StanzaHandlerExtension {}
 
-@freezed
-class StanzaHandlerData with _$StanzaHandlerData {
-  factory StanzaHandlerData(
-    // Indicates to the runner that processing is now done. This means that all
-    // pre-processing is done and no other handlers should be consulted.
-    bool done,
-    // Indicates to the runner that processing is to be cancelled and no further handlers
-    // should run. The stanza also will not be sent.
-    bool cancel,
-    // The reason why we cancelled the processing and sending
-    dynamic cancelReason,
-    // The stanza that is being dealt with. SHOULD NOT be overwritten, unless it is absolutely
-    // necessary, e.g. with Message Carbons or OMEMO
-    Stanza stanza, {
-    // Whether the stanza is retransmitted. Only useful in the context of outgoing
-    // stanza handlers. MUST NOT be overwritten.
-    @Default(false) bool retransmitted,
-    StatelessMediaSharingData? sims,
-    StatelessFileSharingData? sfs,
-    OOBData? oob,
+class StanzaHandlerData {
+  StanzaHandlerData(
+    this.done,
+    this.cancel,
+    this.stanza,
+    this.extensions, {
+    this.cancelReason,
+    this.encryptionError,
+    this.encrypted = false,
+    this.forceEncryption = false,
+  });
 
-    // XEP-0359 <origin-id />'s id attribute, if available.
-    String? originId,
+  /// Indicates to the runner that processing is now done. This means that all
+  /// pre-processing is done and no other handlers should be consulted.
+  bool done;
+
+  /// Indicates to the runner that processing is to be cancelled and no further handlers
+  /// should run. The stanza also will not be sent.
+  bool cancel;
+
+  /// The reason why we cancelled the processing and sending.
+  Object? cancelReason;
+
+  /// The reason why an encryption or decryption failed.
+  Object? encryptionError;
+
+  /// The stanza that is being dealt with. SHOULD NOT be overwritten, unless it is
+  /// absolutely necessary, e.g. with Message Carbons or OMEMO.
+  Stanza stanza;
+
+  /// Whether the stanza was received encrypted
+  bool encrypted;
 
-    // XEP-0359 <stanza-id /> elements, if available.
-    List<StanzaId>? stanzaIds,
-    ReplyData? reply,
-    ChatState? chatState,
-    @Default(false) bool isCarbon,
-    @Default(false) bool deliveryReceiptRequested,
-    @Default(false) bool isMarkable,
-    // File Upload Notifications
-    // A notification
-    FileMetadataData? fun,
-    // The stanza id this replaces
-    String? funReplacement,
-    // The stanza id this cancels
-    String? funCancellation,
-    // Whether the stanza was received encrypted
-    @Default(false) bool encrypted,
   // If true, forces the encryption manager to encrypt to the JID, even if it
   // would not normally. In the case of OMEMO: If shouldEncrypt returns false
   // but forceEncryption is true, then the OMEMO manager will try to encrypt
   // to the JID anyway.
-    @Default(false) bool forceEncryption,
-    // The stated type of encryption used, if any was used
-    ExplicitEncryptionType? encryptionType,
-    // Delayed Delivery
-    DelayedDelivery? delayedDelivery,
-    // This is for stanza handlers that are not part of the XMPP library but still need
-    // pass data around.
-    @Default(<String, dynamic>{}) Map<String, dynamic> other,
-    // If non-null, then it indicates the origin Id of the message that should be
-    // retracted
-    MessageRetractionData? messageRetraction,
-    // If non-null, then the message is a correction for the specified stanza Id
-    String? lastMessageCorrectionSid,
-    // Reactions data
-    MessageReactions? messageReactions,
-    // The Id of the sticker pack this sticker belongs to
-    String? stickerPackId,
-    // Flag indicating whether the stanza should be excluded from stream management's
-    // resending behaviour
-    @Default(false) bool excludeFromStreamManagement,
-  }) = _StanzaHandlerData;
+  bool forceEncryption;
+
+  /// Additional data from other managers.
+  final TypedMap<StanzaHandlerExtension> extensions;
 }

packages/moxxmpp/lib/src/managers/data.freezed.dart

@@ -1,823 +0,0 @@
-// coverage:ignore-file
-// GENERATED CODE - DO NOT MODIFY BY HAND
-// ignore_for_file: type=lint
-// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
-
-part of 'data.dart';
-
-// **************************************************************************
-// FreezedGenerator
-// **************************************************************************
-
-T _$identity<T>(T value) => value;
-
-final _privateConstructorUsedError = UnsupportedError(
-    'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#custom-getters-and-methods');
-
-/// @nodoc
-mixin _$StanzaHandlerData {
-// Indicates to the runner that processing is now done. This means that all
-// pre-processing is done and no other handlers should be consulted.
-  bool get done =>
-      throw _privateConstructorUsedError; // Indicates to the runner that processing is to be cancelled and no further handlers
-// should run. The stanza also will not be sent.
-  bool get cancel =>
-      throw _privateConstructorUsedError; // The reason why we cancelled the processing and sending
-  dynamic get cancelReason =>
-      throw _privateConstructorUsedError; // The stanza that is being dealt with. SHOULD NOT be overwritten, unless it is absolutely
-// necessary, e.g. with Message Carbons or OMEMO
-  Stanza get stanza =>
-      throw _privateConstructorUsedError; // Whether the stanza is retransmitted. Only useful in the context of outgoing
-// stanza handlers. MUST NOT be overwritten.
-  bool get retransmitted => throw _privateConstructorUsedError;
-  StatelessMediaSharingData? get sims => throw _privateConstructorUsedError;
-  StatelessFileSharingData? get sfs => throw _privateConstructorUsedError;
-  OOBData? get oob =>
-      throw _privateConstructorUsedError; // XEP-0359 <origin-id />'s id attribute, if available.
-  String? get originId =>
-      throw _privateConstructorUsedError; // XEP-0359 <stanza-id /> elements, if available.
-  List<StanzaId>? get stanzaIds => throw _privateConstructorUsedError;
-  ReplyData? get reply => throw _privateConstructorUsedError;
-  ChatState? get chatState => throw _privateConstructorUsedError;
-  bool get isCarbon => throw _privateConstructorUsedError;
-  bool get deliveryReceiptRequested => throw _privateConstructorUsedError;
-  bool get isMarkable =>
-      throw _privateConstructorUsedError; // File Upload Notifications
-// A notification
-  FileMetadataData? get fun =>
-      throw _privateConstructorUsedError; // The stanza id this replaces
-  String? get funReplacement =>
-      throw _privateConstructorUsedError; // The stanza id this cancels
-  String? get funCancellation =>
-      throw _privateConstructorUsedError; // Whether the stanza was received encrypted
-  bool get encrypted =>
-      throw _privateConstructorUsedError; // If true, forces the encryption manager to encrypt to the JID, even if it
-// would not normally. In the case of OMEMO: If shouldEncrypt returns false
-// but forceEncryption is true, then the OMEMO manager will try to encrypt
-// to the JID anyway.
-  bool get forceEncryption =>
-      throw _privateConstructorUsedError; // The stated type of encryption used, if any was used
-  ExplicitEncryptionType? get encryptionType =>
-      throw _privateConstructorUsedError; // Delayed Delivery
-  DelayedDelivery? get delayedDelivery =>
-      throw _privateConstructorUsedError; // This is for stanza handlers that are not part of the XMPP library but still need
-// pass data around.
-  Map<String, dynamic> get other =>
-      throw _privateConstructorUsedError; // If non-null, then it indicates the origin Id of the message that should be
-// retracted
-  MessageRetractionData? get messageRetraction =>
-      throw _privateConstructorUsedError; // If non-null, then the message is a correction for the specified stanza Id
-  String? get lastMessageCorrectionSid =>
-      throw _privateConstructorUsedError; // Reactions data
-  MessageReactions? get messageReactions =>
-      throw _privateConstructorUsedError; // The Id of the sticker pack this sticker belongs to
-  String? get stickerPackId =>
-      throw _privateConstructorUsedError; // Flag indicating whether the stanza should be excluded from stream management's
-// resending behaviour
-  bool get excludeFromStreamManagement => throw _privateConstructorUsedError;
-
-  @JsonKey(ignore: true)
-  $StanzaHandlerDataCopyWith<StanzaHandlerData> get copyWith =>
-      throw _privateConstructorUsedError;
-}
-
-/// @nodoc
-abstract class $StanzaHandlerDataCopyWith<$Res> {
-  factory $StanzaHandlerDataCopyWith(
-          StanzaHandlerData value, $Res Function(StanzaHandlerData) then) =
-      _$StanzaHandlerDataCopyWithImpl<$Res, StanzaHandlerData>;
-  @useResult
-  $Res call(
-      {bool done,
-      bool cancel,
-      dynamic cancelReason,
-      Stanza stanza,
-      bool retransmitted,
-      StatelessMediaSharingData? sims,
-      StatelessFileSharingData? sfs,
-      OOBData? oob,
-      String? originId,
-      List<StanzaId>? stanzaIds,
-      ReplyData? reply,
-      ChatState? chatState,
-      bool isCarbon,
-      bool deliveryReceiptRequested,
-      bool isMarkable,
-      FileMetadataData? fun,
-      String? funReplacement,
-      String? funCancellation,
-      bool encrypted,
-      bool forceEncryption,
-      ExplicitEncryptionType? encryptionType,
-      DelayedDelivery? delayedDelivery,
-      Map<String, dynamic> other,
-      MessageRetractionData? messageRetraction,
-      String? lastMessageCorrectionSid,
-      MessageReactions? messageReactions,
-      String? stickerPackId,
-      bool excludeFromStreamManagement});
-}
-
-/// @nodoc
-class _$StanzaHandlerDataCopyWithImpl<$Res, $Val extends StanzaHandlerData>
-    implements $StanzaHandlerDataCopyWith<$Res> {
-  _$StanzaHandlerDataCopyWithImpl(this._value, this._then);
-
-  // ignore: unused_field
-  final $Val _value;
-  // ignore: unused_field
-  final $Res Function($Val) _then;
-
-  @pragma('vm:prefer-inline')
-  @override
-  $Res call({
-    Object? done = null,
-    Object? cancel = null,
-    Object? cancelReason = freezed,
-    Object? stanza = null,
-    Object? retransmitted = null,
-    Object? sims = freezed,
-    Object? sfs = freezed,
-    Object? oob = freezed,
-    Object? originId = freezed,
-    Object? stanzaIds = freezed,
-    Object? reply = freezed,
-    Object? chatState = freezed,
-    Object? isCarbon = null,
-    Object? deliveryReceiptRequested = null,
-    Object? isMarkable = null,
-    Object? fun = freezed,
-    Object? funReplacement = freezed,
-    Object? funCancellation = freezed,
-    Object? encrypted = null,
-    Object? forceEncryption = null,
-    Object? encryptionType = freezed,
-    Object? delayedDelivery = freezed,
-    Object? other = null,
-    Object? messageRetraction = freezed,
-    Object? lastMessageCorrectionSid = freezed,
-    Object? messageReactions = freezed,
-    Object? stickerPackId = freezed,
-    Object? excludeFromStreamManagement = null,
-  }) {
-    return _then(_value.copyWith(
-      done: null == done
-          ? _value.done
-          : done // ignore: cast_nullable_to_non_nullable
-              as bool,
-      cancel: null == cancel
-          ? _value.cancel
-          : cancel // ignore: cast_nullable_to_non_nullable
-              as bool,
-      cancelReason: freezed == cancelReason
-          ? _value.cancelReason
-          : cancelReason // ignore: cast_nullable_to_non_nullable
-              as dynamic,
-      stanza: null == stanza
-          ? _value.stanza
-          : stanza // ignore: cast_nullable_to_non_nullable
-              as Stanza,
-      retransmitted: null == retransmitted
-          ? _value.retransmitted
-          : retransmitted // ignore: cast_nullable_to_non_nullable
-              as bool,
-      sims: freezed == sims
-          ? _value.sims
-          : sims // ignore: cast_nullable_to_non_nullable
-              as StatelessMediaSharingData?,
-      sfs: freezed == sfs
-          ? _value.sfs
-          : sfs // ignore: cast_nullable_to_non_nullable
-              as StatelessFileSharingData?,
-      oob: freezed == oob
-          ? _value.oob
-          : oob // ignore: cast_nullable_to_non_nullable
-              as OOBData?,
-      originId: freezed == originId
-          ? _value.originId
-          : originId // ignore: cast_nullable_to_non_nullable
-              as String?,
-      stanzaIds: freezed == stanzaIds
-          ? _value.stanzaIds
-          : stanzaIds // ignore: cast_nullable_to_non_nullable
-              as List<StanzaId>?,
-      reply: freezed == reply
-          ? _value.reply
-          : reply // ignore: cast_nullable_to_non_nullable
-              as ReplyData?,
-      chatState: freezed == chatState
-          ? _value.chatState
-          : chatState // ignore: cast_nullable_to_non_nullable
-              as ChatState?,
-      isCarbon: null == isCarbon
-          ? _value.isCarbon
-          : isCarbon // ignore: cast_nullable_to_non_nullable
-              as bool,
-      deliveryReceiptRequested: null == deliveryReceiptRequested
-          ? _value.deliveryReceiptRequested
-          : deliveryReceiptRequested // ignore: cast_nullable_to_non_nullable
-              as bool,
-      isMarkable: null == isMarkable
-          ? _value.isMarkable
-          : isMarkable // ignore: cast_nullable_to_non_nullable
-              as bool,
-      fun: freezed == fun
-          ? _value.fun
-          : fun // ignore: cast_nullable_to_non_nullable
-              as FileMetadataData?,
-      funReplacement: freezed == funReplacement
-          ? _value.funReplacement
-          : funReplacement // ignore: cast_nullable_to_non_nullable
-              as String?,
-      funCancellation: freezed == funCancellation
-          ? _value.funCancellation
-          : funCancellation // ignore: cast_nullable_to_non_nullable
-              as String?,
-      encrypted: null == encrypted
-          ? _value.encrypted
-          : encrypted // ignore: cast_nullable_to_non_nullable
-              as bool,
-      forceEncryption: null == forceEncryption
-          ? _value.forceEncryption
-          : forceEncryption // ignore: cast_nullable_to_non_nullable
-              as bool,
-      encryptionType: freezed == encryptionType
-          ? _value.encryptionType
-          : encryptionType // ignore: cast_nullable_to_non_nullable
-              as ExplicitEncryptionType?,
-      delayedDelivery: freezed == delayedDelivery
-          ? _value.delayedDelivery
-          : delayedDelivery // ignore: cast_nullable_to_non_nullable
-              as DelayedDelivery?,
-      other: null == other
-          ? _value.other
-          : other // ignore: cast_nullable_to_non_nullable
-              as Map<String, dynamic>,
-      messageRetraction: freezed == messageRetraction
-          ? _value.messageRetraction
-          : messageRetraction // ignore: cast_nullable_to_non_nullable
-              as MessageRetractionData?,
-      lastMessageCorrectionSid: freezed == lastMessageCorrectionSid
-          ? _value.lastMessageCorrectionSid
-          : lastMessageCorrectionSid // ignore: cast_nullable_to_non_nullable
-              as String?,
-      messageReactions: freezed == messageReactions
-          ? _value.messageReactions
-          : messageReactions // ignore: cast_nullable_to_non_nullable
-              as MessageReactions?,
-      stickerPackId: freezed == stickerPackId
-          ? _value.stickerPackId
-          : stickerPackId // ignore: cast_nullable_to_non_nullable
-              as String?,
-      excludeFromStreamManagement: null == excludeFromStreamManagement
-          ? _value.excludeFromStreamManagement
-          : excludeFromStreamManagement // ignore: cast_nullable_to_non_nullable
-              as bool,
-    ) as $Val);
-  }
-}
-
-/// @nodoc
-abstract class _$$_StanzaHandlerDataCopyWith<$Res>
-    implements $StanzaHandlerDataCopyWith<$Res> {
-  factory _$$_StanzaHandlerDataCopyWith(_$_StanzaHandlerData value,
-          $Res Function(_$_StanzaHandlerData) then) =
-      __$$_StanzaHandlerDataCopyWithImpl<$Res>;
-  @override
-  @useResult
-  $Res call(
-      {bool done,
-      bool cancel,
-      dynamic cancelReason,
-      Stanza stanza,
-      bool retransmitted,
-      StatelessMediaSharingData? sims,
-      StatelessFileSharingData? sfs,
-      OOBData? oob,
-      String? originId,
-      List<StanzaId>? stanzaIds,
-      ReplyData? reply,
-      ChatState? chatState,
-      bool isCarbon,
-      bool deliveryReceiptRequested,
-      bool isMarkable,
-      FileMetadataData? fun,
-      String? funReplacement,
-      String? funCancellation,
-      bool encrypted,
-      bool forceEncryption,
-      ExplicitEncryptionType? encryptionType,
-      DelayedDelivery? delayedDelivery,
-      Map<String, dynamic> other,
-      MessageRetractionData? messageRetraction,
-      String? lastMessageCorrectionSid,
-      MessageReactions? messageReactions,
-      String? stickerPackId,
-      bool excludeFromStreamManagement});
-}
-
-/// @nodoc
-class __$$_StanzaHandlerDataCopyWithImpl<$Res>
-    extends _$StanzaHandlerDataCopyWithImpl<$Res, _$_StanzaHandlerData>
-    implements _$$_StanzaHandlerDataCopyWith<$Res> {
-  __$$_StanzaHandlerDataCopyWithImpl(
-      _$_StanzaHandlerData _value, $Res Function(_$_StanzaHandlerData) _then)
-      : super(_value, _then);
-
-  @pragma('vm:prefer-inline')
-  @override
-  $Res call({
-    Object? done = null,
-    Object? cancel = null,
-    Object? cancelReason = freezed,
-    Object? stanza = null,
-    Object? retransmitted = null,
-    Object? sims = freezed,
-    Object? sfs = freezed,
-    Object? oob = freezed,
-    Object? originId = freezed,
-    Object? stanzaIds = freezed,
-    Object? reply = freezed,
-    Object? chatState = freezed,
-    Object? isCarbon = null,
-    Object? deliveryReceiptRequested = null,
-    Object? isMarkable = null,
-    Object? fun = freezed,
-    Object? funReplacement = freezed,
-    Object? funCancellation = freezed,
-    Object? encrypted = null,
-    Object? forceEncryption = null,
-    Object? encryptionType = freezed,
-    Object? delayedDelivery = freezed,
-    Object? other = null,
-    Object? messageRetraction = freezed,
-    Object? lastMessageCorrectionSid = freezed,
-    Object? messageReactions = freezed,
-    Object? stickerPackId = freezed,
-    Object? excludeFromStreamManagement = null,
-  }) {
-    return _then(_$_StanzaHandlerData(
-      null == done
-          ? _value.done
-          : done // ignore: cast_nullable_to_non_nullable
-              as bool,
-      null == cancel
-          ? _value.cancel
-          : cancel // ignore: cast_nullable_to_non_nullable
-              as bool,
-      freezed == cancelReason
-          ? _value.cancelReason
-          : cancelReason // ignore: cast_nullable_to_non_nullable
-              as dynamic,
-      null == stanza
-          ? _value.stanza
-          : stanza // ignore: cast_nullable_to_non_nullable
-              as Stanza,
-      retransmitted: null == retransmitted
-          ? _value.retransmitted
-          : retransmitted // ignore: cast_nullable_to_non_nullable
-              as bool,
-      sims: freezed == sims
-          ? _value.sims
-          : sims // ignore: cast_nullable_to_non_nullable
-              as StatelessMediaSharingData?,
-      sfs: freezed == sfs
-          ? _value.sfs
-          : sfs // ignore: cast_nullable_to_non_nullable
-              as StatelessFileSharingData?,
-      oob: freezed == oob
-          ? _value.oob
-          : oob // ignore: cast_nullable_to_non_nullable
-              as OOBData?,
-      originId: freezed == originId
-          ? _value.originId
-          : originId // ignore: cast_nullable_to_non_nullable
-              as String?,
-      stanzaIds: freezed == stanzaIds
-          ? _value._stanzaIds
-          : stanzaIds // ignore: cast_nullable_to_non_nullable
-              as List<StanzaId>?,
-      reply: freezed == reply
-          ? _value.reply
-          : reply // ignore: cast_nullable_to_non_nullable
-              as ReplyData?,
-      chatState: freezed == chatState
-          ? _value.chatState
-          : chatState // ignore: cast_nullable_to_non_nullable
-              as ChatState?,
-      isCarbon: null == isCarbon
-          ? _value.isCarbon
-          : isCarbon // ignore: cast_nullable_to_non_nullable
-              as bool,
-      deliveryReceiptRequested: null == deliveryReceiptRequested
-          ? _value.deliveryReceiptRequested
-          : deliveryReceiptRequested // ignore: cast_nullable_to_non_nullable
-              as bool,
-      isMarkable: null == isMarkable
-          ? _value.isMarkable
-          : isMarkable // ignore: cast_nullable_to_non_nullable
-              as bool,
-      fun: freezed == fun
-          ? _value.fun
-          : fun // ignore: cast_nullable_to_non_nullable
-              as FileMetadataData?,
-      funReplacement: freezed == funReplacement
-          ? _value.funReplacement
-          : funReplacement // ignore: cast_nullable_to_non_nullable
-              as String?,
-      funCancellation: freezed == funCancellation
-          ? _value.funCancellation
-          : funCancellation // ignore: cast_nullable_to_non_nullable
-              as String?,
-      encrypted: null == encrypted
-          ? _value.encrypted
-          : encrypted // ignore: cast_nullable_to_non_nullable
-              as bool,
-      forceEncryption: null == forceEncryption
-          ? _value.forceEncryption
-          : forceEncryption // ignore: cast_nullable_to_non_nullable
-              as bool,
-      encryptionType: freezed == encryptionType
-          ? _value.encryptionType
-          : encryptionType // ignore: cast_nullable_to_non_nullable
-              as ExplicitEncryptionType?,
-      delayedDelivery: freezed == delayedDelivery
-          ? _value.delayedDelivery
-          : delayedDelivery // ignore: cast_nullable_to_non_nullable
-              as DelayedDelivery?,
-      other: null == other
-          ? _value._other
-          : other // ignore: cast_nullable_to_non_nullable
-              as Map<String, dynamic>,
-      messageRetraction: freezed == messageRetraction
-          ? _value.messageRetraction
-          : messageRetraction // ignore: cast_nullable_to_non_nullable
-              as MessageRetractionData?,
-      lastMessageCorrectionSid: freezed == lastMessageCorrectionSid
-          ? _value.lastMessageCorrectionSid
-          : lastMessageCorrectionSid // ignore: cast_nullable_to_non_nullable
-              as String?,
-      messageReactions: freezed == messageReactions
-          ? _value.messageReactions
-          : messageReactions // ignore: cast_nullable_to_non_nullable
-              as MessageReactions?,
-      stickerPackId: freezed == stickerPackId
-          ? _value.stickerPackId
-          : stickerPackId // ignore: cast_nullable_to_non_nullable
-              as String?,
-      excludeFromStreamManagement: null == excludeFromStreamManagement
-          ? _value.excludeFromStreamManagement
-          : excludeFromStreamManagement // ignore: cast_nullable_to_non_nullable
-              as bool,
-    ));
-  }
-}
-
-/// @nodoc
-
-class _$_StanzaHandlerData implements _StanzaHandlerData {
-  _$_StanzaHandlerData(this.done, this.cancel, this.cancelReason, this.stanza,
-      {this.retransmitted = false,
-      this.sims,
-      this.sfs,
-      this.oob,
-      this.originId,
-      final List<StanzaId>? stanzaIds,
-      this.reply,
-      this.chatState,
-      this.isCarbon = false,
-      this.deliveryReceiptRequested = false,
-      this.isMarkable = false,
-      this.fun,
-      this.funReplacement,
-      this.funCancellation,
-      this.encrypted = false,
-      this.forceEncryption = false,
-      this.encryptionType,
-      this.delayedDelivery,
-      final Map<String, dynamic> other = const <String, dynamic>{},
-      this.messageRetraction,
-      this.lastMessageCorrectionSid,
-      this.messageReactions,
-      this.stickerPackId,
-      this.excludeFromStreamManagement = false})
-      : _stanzaIds = stanzaIds,
-        _other = other;
-
-// Indicates to the runner that processing is now done. This means that all
-// pre-processing is done and no other handlers should be consulted.
-  @override
-  final bool done;
-// Indicates to the runner that processing is to be cancelled and no further handlers
-// should run. The stanza also will not be sent.
-  @override
-  final bool cancel;
-// The reason why we cancelled the processing and sending
-  @override
-  final dynamic cancelReason;
-// The stanza that is being dealt with. SHOULD NOT be overwritten, unless it is absolutely
-// necessary, e.g. with Message Carbons or OMEMO
-  @override
-  final Stanza stanza;
-// Whether the stanza is retransmitted. Only useful in the context of outgoing
-// stanza handlers. MUST NOT be overwritten.
-  @override
-  @JsonKey()
-  final bool retransmitted;
-  @override
-  final StatelessMediaSharingData? sims;
-  @override
-  final StatelessFileSharingData? sfs;
-  @override
-  final OOBData? oob;
-// XEP-0359 <origin-id />'s id attribute, if available.
-  @override
-  final String? originId;
-// XEP-0359 <stanza-id /> elements, if available.
-  final List<StanzaId>? _stanzaIds;
-// XEP-0359 <stanza-id /> elements, if available.
-  @override
-  List<StanzaId>? get stanzaIds {
-    final value = _stanzaIds;
-    if (value == null) return null;
-    if (_stanzaIds is EqualUnmodifiableListView) return _stanzaIds;
-    // ignore: implicit_dynamic_type
-    return EqualUnmodifiableListView(value);
-  }
-
-  @override
-  final ReplyData? reply;
-  @override
-  final ChatState? chatState;
-  @override
-  @JsonKey()
-  final bool isCarbon;
-  @override
-  @JsonKey()
-  final bool deliveryReceiptRequested;
-  @override
-  @JsonKey()
-  final bool isMarkable;
-// File Upload Notifications
-// A notification
-  @override
-  final FileMetadataData? fun;
-// The stanza id this replaces
-  @override
-  final String? funReplacement;
-// The stanza id this cancels
-  @override
-  final String? funCancellation;
-// Whether the stanza was received encrypted
-  @override
-  @JsonKey()
-  final bool encrypted;
-// If true, forces the encryption manager to encrypt to the JID, even if it
-// would not normally. In the case of OMEMO: If shouldEncrypt returns false
-// but forceEncryption is true, then the OMEMO manager will try to encrypt
-// to the JID anyway.
-  @override
-  @JsonKey()
-  final bool forceEncryption;
-// The stated type of encryption used, if any was used
-  @override
-  final ExplicitEncryptionType? encryptionType;
-// Delayed Delivery
-  @override
-  final DelayedDelivery? delayedDelivery;
-// This is for stanza handlers that are not part of the XMPP library but still need
-// pass data around.
-  final Map<String, dynamic> _other;
-// This is for stanza handlers that are not part of the XMPP library but still need
-// pass data around.
-  @override
-  @JsonKey()
-  Map<String, dynamic> get other {
-    if (_other is EqualUnmodifiableMapView) return _other;
-    // ignore: implicit_dynamic_type
-    return EqualUnmodifiableMapView(_other);
-  }
-
-// If non-null, then it indicates the origin Id of the message that should be
-// retracted
-  @override
-  final MessageRetractionData? messageRetraction;
-// If non-null, then the message is a correction for the specified stanza Id
-  @override
-  final String? lastMessageCorrectionSid;
-// Reactions data
-  @override
-  final MessageReactions? messageReactions;
-// The Id of the sticker pack this sticker belongs to
-  @override
-  final String? stickerPackId;
-// Flag indicating whether the stanza should be excluded from stream management's
-// resending behaviour
-  @override
-  @JsonKey()
-  final bool excludeFromStreamManagement;
-
-  @override
-  String toString() {
-    return 'StanzaHandlerData(done: $done, cancel: $cancel, cancelReason: $cancelReason, stanza: $stanza, retransmitted: $retransmitted, sims: $sims, sfs: $sfs, oob: $oob, originId: $originId, stanzaIds: $stanzaIds, reply: $reply, chatState: $chatState, isCarbon: $isCarbon, deliveryReceiptRequested: $deliveryReceiptRequested, isMarkable: $isMarkable, fun: $fun, funReplacement: $funReplacement, funCancellation: $funCancellation, encrypted: $encrypted, forceEncryption: $forceEncryption, encryptionType: $encryptionType, delayedDelivery: $delayedDelivery, other: $other, messageRetraction: $messageRetraction, lastMessageCorrectionSid: $lastMessageCorrectionSid, messageReactions: $messageReactions, stickerPackId: $stickerPackId, excludeFromStreamManagement: $excludeFromStreamManagement)';
-  }
-
-  @override
-  bool operator ==(dynamic other) {
-    return identical(this, other) ||
-        (other.runtimeType == runtimeType &&
-            other is _$_StanzaHandlerData &&
-            (identical(other.done, done) || other.done == done) &&
-            (identical(other.cancel, cancel) || other.cancel == cancel) &&
-            const DeepCollectionEquality()
-                .equals(other.cancelReason, cancelReason) &&
-            (identical(other.stanza, stanza) || other.stanza == stanza) &&
-            (identical(other.retransmitted, retransmitted) ||
-                other.retransmitted == retransmitted) &&
-            (identical(other.sims, sims) || other.sims == sims) &&
-            (identical(other.sfs, sfs) || other.sfs == sfs) &&
-            (identical(other.oob, oob) || other.oob == oob) &&
-            (identical(other.originId, originId) ||
-                other.originId == originId) &&
-            const DeepCollectionEquality()
-                .equals(other._stanzaIds, _stanzaIds) &&
-            (identical(other.reply, reply) || other.reply == reply) &&
-            (identical(other.chatState, chatState) ||
-                other.chatState == chatState) &&
-            (identical(other.isCarbon, isCarbon) ||
-                other.isCarbon == isCarbon) &&
-            (identical(
-                    other.deliveryReceiptRequested, deliveryReceiptRequested) ||
-                other.deliveryReceiptRequested == deliveryReceiptRequested) &&
-            (identical(other.isMarkable, isMarkable) ||
-                other.isMarkable == isMarkable) &&
-            (identical(other.fun, fun) || other.fun == fun) &&
-            (identical(other.funReplacement, funReplacement) ||
-                other.funReplacement == funReplacement) &&
-            (identical(other.funCancellation, funCancellation) ||
-                other.funCancellation == funCancellation) &&
-            (identical(other.encrypted, encrypted) ||
-                other.encrypted == encrypted) &&
-            (identical(other.forceEncryption, forceEncryption) ||
-                other.forceEncryption == forceEncryption) &&
-            (identical(other.encryptionType, encryptionType) ||
-                other.encryptionType == encryptionType) &&
-            (identical(other.delayedDelivery, delayedDelivery) ||
-                other.delayedDelivery == delayedDelivery) &&
-            const DeepCollectionEquality().equals(other._other, this._other) &&
-            (identical(other.messageRetraction, messageRetraction) ||
-                other.messageRetraction == messageRetraction) &&
-            (identical(
-                    other.lastMessageCorrectionSid, lastMessageCorrectionSid) ||
-                other.lastMessageCorrectionSid == lastMessageCorrectionSid) &&
-            (identical(other.messageReactions, messageReactions) ||
-                other.messageReactions == messageReactions) &&
-            (identical(other.stickerPackId, stickerPackId) ||
-                other.stickerPackId == stickerPackId) &&
-            (identical(other.excludeFromStreamManagement,
-                    excludeFromStreamManagement) ||
-                other.excludeFromStreamManagement ==
-                    excludeFromStreamManagement));
-  }
-
-  @override
-  int get hashCode => Object.hashAll([
-        runtimeType,
-        done,
-        cancel,
-        const DeepCollectionEquality().hash(cancelReason),
-        stanza,
-        retransmitted,
-        sims,
-        sfs,
-        oob,
-        originId,
-        const DeepCollectionEquality().hash(_stanzaIds),
-        reply,
-        chatState,
-        isCarbon,
-        deliveryReceiptRequested,
-        isMarkable,
-        fun,
-        funReplacement,
-        funCancellation,
-        encrypted,
-        forceEncryption,
-        encryptionType,
-        delayedDelivery,
-        const DeepCollectionEquality().hash(_other),
-        messageRetraction,
-        lastMessageCorrectionSid,
-        messageReactions,
-        stickerPackId,
-        excludeFromStreamManagement
-      ]);
-
-  @JsonKey(ignore: true)
-  @override
-  @pragma('vm:prefer-inline')
-  _$$_StanzaHandlerDataCopyWith<_$_StanzaHandlerData> get copyWith =>
-      __$$_StanzaHandlerDataCopyWithImpl<_$_StanzaHandlerData>(
-          this, _$identity);
-}
-
-abstract class _StanzaHandlerData implements StanzaHandlerData {
-  factory _StanzaHandlerData(final bool done, final bool cancel,
-      final dynamic cancelReason, final Stanza stanza,
-      {final bool retransmitted,
-      final StatelessMediaSharingData? sims,
-      final StatelessFileSharingData? sfs,
-      final OOBData? oob,
-      final String? originId,
-      final List<StanzaId>? stanzaIds,
-      final ReplyData? reply,
-      final ChatState? chatState,
-      final bool isCarbon,
-      final bool deliveryReceiptRequested,
-      final bool isMarkable,
-      final FileMetadataData? fun,
-      final String? funReplacement,
-      final String? funCancellation,
-      final bool encrypted,
-      final bool forceEncryption,
-      final ExplicitEncryptionType? encryptionType,
-      final DelayedDelivery? delayedDelivery,
-      final Map<String, dynamic> other,
-      final MessageRetractionData? messageRetraction,
-      final String? lastMessageCorrectionSid,
-      final MessageReactions? messageReactions,
-      final String? stickerPackId,
-      final bool excludeFromStreamManagement}) = _$_StanzaHandlerData;
-
-  @override // Indicates to the runner that processing is now done. This means that all
-// pre-processing is done and no other handlers should be consulted.
-  bool get done;
-  @override // Indicates to the runner that processing is to be cancelled and no further handlers
-// should run. The stanza also will not be sent.
-  bool get cancel;
-  @override // The reason why we cancelled the processing and sending
-  dynamic get cancelReason;
-  @override // The stanza that is being dealt with. SHOULD NOT be overwritten, unless it is absolutely
-// necessary, e.g. with Message Carbons or OMEMO
-  Stanza get stanza;
-  @override // Whether the stanza is retransmitted. Only useful in the context of outgoing
-// stanza handlers. MUST NOT be overwritten.
-  bool get retransmitted;
-  @override
-  StatelessMediaSharingData? get sims;
-  @override
-  StatelessFileSharingData? get sfs;
-  @override
-  OOBData? get oob;
-  @override // XEP-0359 <origin-id />'s id attribute, if available.
-  String? get originId;
-  @override // XEP-0359 <stanza-id /> elements, if available.
-  List<StanzaId>? get stanzaIds;
-  @override
-  ReplyData? get reply;
-  @override
-  ChatState? get chatState;
-  @override
-  bool get isCarbon;
-  @override
-  bool get deliveryReceiptRequested;
-  @override
-  bool get isMarkable;
-  @override // File Upload Notifications
-// A notification
-  FileMetadataData? get fun;
-  @override // The stanza id this replaces
-  String? get funReplacement;
-  @override // The stanza id this cancels
-  String? get funCancellation;
-  @override // Whether the stanza was received encrypted
-  bool get encrypted;
-  @override // If true, forces the encryption manager to encrypt to the JID, even if it
-// would not normally. In the case of OMEMO: If shouldEncrypt returns false
-// but forceEncryption is true, then the OMEMO manager will try to encrypt
-// to the JID anyway.
-  bool get forceEncryption;
-  @override // The stated type of encryption used, if any was used
-  ExplicitEncryptionType? get encryptionType;
-  @override // Delayed Delivery
-  DelayedDelivery? get delayedDelivery;
-  @override // This is for stanza handlers that are not part of the XMPP library but still need
-// pass data around.
-  Map<String, dynamic> get other;
-  @override // If non-null, then it indicates the origin Id of the message that should be
-// retracted
-  MessageRetractionData? get messageRetraction;
-  @override // If non-null, then the message is a correction for the specified stanza Id
-  String? get lastMessageCorrectionSid;
-  @override // Reactions data
-  MessageReactions? get messageReactions;
-  @override // The Id of the sticker pack this sticker belongs to
-  String? get stickerPackId;
-  @override // Flag indicating whether the stanza should be excluded from stream management's
-// resending behaviour
-  bool get excludeFromStreamManagement;
-  @override
-  @JsonKey(ignore: true)
-  _$$_StanzaHandlerDataCopyWith<_$_StanzaHandlerData> get copyWith =>
-      throw _privateConstructorUsedError;
-}

packages/moxxmpp/lib/src/managers/namespaces.dart

@@ -31,3 +31,4 @@ const lastMessageCorrectionManager = 'org.moxxmpp.lastmessagecorrectionmanager';
 const messageReactionsManager = 'org.moxxmpp.messagereactionsmanager';
 const stickersManager = 'org.moxxmpp.stickersmanager';
 const entityCapabilitiesManager = 'org.moxxmpp.entitycapabilities';
+const messageProcessingHintManager = 'org.moxxmpp.messageprocessinghint';

packages/moxxmpp/lib/src/message.dart

@@ -1,89 +1,71 @@
-import 'package:moxlib/moxlib.dart';
+import 'package:collection/collection.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
-import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
-import 'package:moxxmpp/src/xeps/staging/file_upload_notification.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 import 'package:moxxmpp/src/xeps/xep_0066.dart';
-import 'package:moxxmpp/src/xeps/xep_0085.dart';
-import 'package:moxxmpp/src/xeps/xep_0184.dart';
-import 'package:moxxmpp/src/xeps/xep_0308.dart';
-import 'package:moxxmpp/src/xeps/xep_0333.dart';
-import 'package:moxxmpp/src/xeps/xep_0334.dart';
-import 'package:moxxmpp/src/xeps/xep_0359.dart';
-import 'package:moxxmpp/src/xeps/xep_0424.dart';
-import 'package:moxxmpp/src/xeps/xep_0444.dart';
-import 'package:moxxmpp/src/xeps/xep_0446.dart';
 import 'package:moxxmpp/src/xeps/xep_0447.dart';
-import 'package:moxxmpp/src/xeps/xep_0448.dart';
+import 'package:moxxmpp/src/xeps/xep_0449.dart';
 import 'package:moxxmpp/src/xeps/xep_0461.dart';
 
-/// Data used to build a message stanza.
-///
-/// [setOOBFallbackBody] indicates, when using SFS, whether a OOB fallback should be
-/// added. This is recommended when sharing files but may cause issues when the message
-/// stanza should include a SFS element without any fallbacks.
-class MessageDetails {
-  const MessageDetails({
-    required this.to,
-    this.body,
-    this.requestDeliveryReceipt = false,
-    this.requestChatMarkers = true,
-    this.id,
-    this.originId,
-    this.quoteBody,
-    this.quoteId,
-    this.quoteFrom,
-    this.chatState,
-    this.sfs,
-    this.fun,
-    this.funReplacement,
-    this.funCancellation,
-    this.shouldEncrypt = false,
-    this.messageRetraction,
-    this.lastMessageCorrectionId,
-    this.messageReactions,
-    this.messageProcessingHints,
-    this.stickerPackId,
-    this.setOOBFallbackBody = true,
-  });
-  final String to;
+/// A callback that is called whenever a message is sent using
+/// [MessageManager.sendMessage]. The input the typed map that is passed to
+/// sendMessage.
+typedef MessageSendingCallback = List<XMLNode> Function(
+  TypedMap<StanzaHandlerExtension>,
+);
+
+/// The raw content of the <body /> element.
+class MessageBodyData implements StanzaHandlerExtension {
+  const MessageBodyData(this.body);
+
+  /// The content of the <body /> element.
   final String? body;
-  final bool requestDeliveryReceipt;
-  final bool requestChatMarkers;
-  final String? id;
-  final String? originId;
-  final String? quoteBody;
-  final String? quoteId;
-  final String? quoteFrom;
-  final ChatState? chatState;
-  final StatelessFileSharingData? sfs;
-  final FileMetadataData? fun;
-  final String? funReplacement;
-  final String? funCancellation;
-  final bool shouldEncrypt;
-  final MessageRetractionData? messageRetraction;
-  final String? lastMessageCorrectionId;
-  final MessageReactions? messageReactions;
-  final String? stickerPackId;
-  final List<MessageProcessingHint>? messageProcessingHints;
-  final bool setOOBFallbackBody;
+
+  XMLNode toXML() {
+    return XMLNode(
+      tag: 'body',
+      text: body,
+    );
+  }
+}
+
+/// The id attribute of the message stanza.
+class MessageIdData implements StanzaHandlerExtension {
+  const MessageIdData(this.id);
+
+  /// The id attribute of the stanza.
+  final String id;
 }
 
 class MessageManager extends XmppManagerBase {
   MessageManager() : super(messageManager);
 
+  /// The priority of the message handler. If a handler should run before this one,
+  /// which emits the [MessageEvent] event and terminates processing, make sure it
+  /// has a priority greater than [messageHandlerPriority].
+  static int messageHandlerPriority = -100;
+
+  /// A list of callbacks that are called when a message is sent in order to add
+  /// appropriate child elements.
+  final List<MessageSendingCallback> _messageSendingCallbacks =
+      List<MessageSendingCallback>.empty(growable: true);
+
+  void registerMessageSendingCallback(MessageSendingCallback callback) {
+    _messageSendingCallbacks.add(callback);
+  }
+
   @override
   List<StanzaHandler> getIncomingStanzaHandlers() => [
         StanzaHandler(
           stanzaTag: 'message',
           callback: _onMessage,
-          priority: -100,
+          priority: messageHandlerPriority,
         )
       ];
 
@@ -94,238 +76,69 @@ class MessageManager extends XmppManagerBase {
     Stanza _,
     StanzaHandlerData state,
   ) async {
-    final message = state.stanza;
-    final body = message.firstTag('body');
-
-    final hints = List<MessageProcessingHint>.empty(growable: true);
-    for (final element
-        in message.findTagsByXmlns(messageProcessingHintsXmlns)) {
-      hints.add(messageProcessingHintFromXml(element));
-    }
-
     getAttributes().sendEvent(
       MessageEvent(
-        body: body != null ? body.innerText() : '',
-        fromJid: JID.fromString(message.attributes['from']! as String),
-        toJid: JID.fromString(message.attributes['to']! as String),
-        sid: message.attributes['id']! as String,
-        originId: state.originId,
-        stanzaIds: state.stanzaIds,
-        isCarbon: state.isCarbon,
-        deliveryReceiptRequested: state.deliveryReceiptRequested,
-        isMarkable: state.isMarkable,
-        type: message.attributes['type'] as String?,
-        oob: state.oob,
-        sfs: state.sfs,
-        sims: state.sims,
-        reply: state.reply,
-        chatState: state.chatState,
-        fun: state.fun,
-        funReplacement: state.funReplacement,
-        funCancellation: state.funCancellation,
-        encrypted: state.encrypted,
-        messageRetraction: state.messageRetraction,
-        messageCorrectionId: state.lastMessageCorrectionSid,
-        messageReactions: state.messageReactions,
-        messageProcessingHints: hints.isEmpty ? null : hints,
-        stickerPackId: state.stickerPackId,
-        other: state.other,
-        error: StanzaError.fromStanza(message),
+        JID.fromString(state.stanza.attributes['from']! as String),
+        JID.fromString(state.stanza.attributes['to']! as String),
+        state.stanza.attributes['id']! as String,
+        state.encrypted,
+        state.extensions,
+        type: state.stanza.attributes['type'] as String?,
+        error: StanzaError.fromStanza(state.stanza),
+        encryptionError: state.encryptionError,
       ),
     );
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
-  /// Send a message to to with the content body. If deliveryRequest is true, then
-  /// the message will also request a delivery receipt from the receiver.
-  /// If id is non-null, then it will be the id of the message stanza.
-  /// element to this id. If originId is non-null, then it will create an "origin-id"
-  /// child in the message stanza and set its id to originId.
-  void sendMessage(MessageDetails details) {
-    assert(
-      implies(
-        details.quoteBody != null,
-        details.quoteFrom != null && details.quoteId != null,
-      ),
-      'When quoting a message, then quoteFrom and quoteId must also be non-null',
-    );
-
-    final stanza = Stanza.message(
-      to: details.to,
-      type: 'chat',
-      id: details.id,
-      children: [],
-    );
-
-    if (details.quoteBody != null) {
-      final quote = QuoteData.fromBodies(details.quoteBody!, details.body!);
-
-      stanza
-        ..addChild(
-          XMLNode(tag: 'body', text: quote.body),
-        )
-        ..addChild(
-          XMLNode.xmlns(
-            tag: 'reply',
-            xmlns: replyXmlns,
-            attributes: {'to': details.quoteFrom!, 'id': details.quoteId!},
-          ),
-        )
-        ..addChild(
-          XMLNode.xmlns(
-            tag: 'fallback',
-            xmlns: fallbackXmlns,
-            attributes: {'for': replyXmlns},
-            children: [
-              XMLNode(
-                tag: 'body',
-                attributes: <String, String>{
-                  'start': '0',
-                  'end': '${quote.fallbackLength}',
-                },
-              )
-            ],
-          ),
-        );
-    } else {
-      var body = details.body;
-      if (details.sfs != null && details.setOOBFallbackBody) {
-        // TODO(Unknown): Maybe find a better solution
-        final firstSource = details.sfs!.sources.first;
-        if (firstSource is StatelessFileSharingUrlSource) {
-          body = firstSource.url;
-        } else if (firstSource is StatelessFileSharingEncryptedSource) {
-          body = firstSource.source.url;
-        }
-      } else if (details.messageRetraction?.fallback != null) {
-        body = details.messageRetraction!.fallback;
-      }
-
-      if (body != null) {
-        stanza.addChild(
-          XMLNode(tag: 'body', text: body),
-        );
-      }
-    }
-
-    if (details.requestDeliveryReceipt) {
-      stanza.addChild(makeMessageDeliveryRequest());
-    }
-    if (details.requestChatMarkers) {
-      stanza.addChild(makeChatMarkerMarkable());
-    }
-    if (details.originId != null) {
-      stanza.addChild(makeOriginIdElement(details.originId!));
-    }
-
-    if (details.sfs != null) {
-      stanza.addChild(details.sfs!.toXML());
-
-      final source = details.sfs!.sources.first;
-      if (source is StatelessFileSharingUrlSource &&
-          details.setOOBFallbackBody) {
-        // SFS recommends OOB as a fallback
-        stanza.addChild(constructOOBNode(OOBData(url: source.url)));
-      }
-    }
-
-    if (details.chatState != null) {
-      stanza.addChild(
-        // TODO(Unknown): Move this into xep_0085.dart
-        XMLNode.xmlns(
-          tag: chatStateToString(details.chatState!),
-          xmlns: chatStateXmlns,
-        ),
-      );
-    }
-
-    if (details.fun != null) {
-      stanza.addChild(
-        XMLNode.xmlns(
-          tag: 'file-upload',
-          xmlns: fileUploadNotificationXmlns,
-          children: [
-            details.fun!.toXML(),
-          ],
-        ),
-      );
-    }
-
-    if (details.funReplacement != null) {
-      stanza.addChild(
-        XMLNode.xmlns(
-          tag: 'replaces',
-          xmlns: fileUploadNotificationXmlns,
-          attributes: <String, String>{
-            'id': details.funReplacement!,
-          },
-        ),
-      );
-    }
-
-    if (details.messageRetraction != null) {
-      stanza.addChild(
-        XMLNode.xmlns(
-          tag: 'apply-to',
-          xmlns: fasteningXmlns,
-          attributes: <String, String>{
-            'id': details.messageRetraction!.id,
-          },
-          children: [
-            XMLNode.xmlns(
-              tag: 'retract',
-              xmlns: messageRetractionXmlns,
-            ),
-          ],
-        ),
-      );
-
-      if (details.messageRetraction!.fallback != null) {
-        stanza.addChild(
-          XMLNode.xmlns(
-            tag: 'fallback',
-            xmlns: fallbackIndicationXmlns,
-          ),
-        );
-      }
-    }
-
-    if (details.lastMessageCorrectionId != null) {
-      stanza.addChild(
-        makeLastMessageCorrectionEdit(
-          details.lastMessageCorrectionId!,
-        ),
-      );
-    }
-
-    if (details.messageReactions != null) {
-      stanza.addChild(details.messageReactions!.toXml());
-    }
-
-    if (details.messageProcessingHints != null) {
-      for (final hint in details.messageProcessingHints!) {
-        stanza.addChild(hint.toXml());
-      }
-    }
-
-    if (details.stickerPackId != null) {
-      stanza.addChild(
-        XMLNode.xmlns(
-          tag: 'sticker',
-          xmlns: stickersXmlns,
-          attributes: {
-            'pack': details.stickerPackId!,
-          },
-        ),
-      );
-    }
-
-    getAttributes().sendStanza(
+  /// Send an unawaitable message to [to]. [extensions] is a typed map that contains
+  /// data for building the message.
+  Future<void> sendMessage(
+    JID to,
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) async {
+    await getAttributes().sendStanza(
       StanzaDetails(
-        stanza,
+        Stanza.message(
+          to: to.toString(),
+          id: extensions.get<MessageIdData>()?.id,
+          type: 'chat',
+          children: _messageSendingCallbacks
+              .map((c) => c(extensions))
+              .flattened
+              .toList(),
+        ),
         awaitable: false,
       ),
     );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    if (extensions.get<ReplyData>() != null) {
+      return [];
+    }
+    if (extensions.get<StickersData>() != null) {
+      return [];
+    }
+    if (extensions.get<StatelessFileSharingData>() != null) {
+      return [];
+    }
+    if (extensions.get<OOBData>() != null) {
+      return [];
+    }
+
+    final data = extensions.get<MessageBodyData>();
+    return data != null ? [data.toXML()] : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/namespaces.dart

@@ -9,6 +9,7 @@ const fullStanzaXmlns = 'urn:ietf:params:xml:ns:xmpp-stanzas';
 // RFC 6121
 const rosterXmlns = 'jabber:iq:roster';
 const rosterVersioningXmlns = 'urn:xmpp:features:rosterver';
+const subscriptionPreApprovalXmlns = 'urn:xmpp:features:pre-approval';
 
 // XEP-0004
 const dataFormsXmlns = 'jabber:x:data';
@@ -96,7 +97,7 @@ const httpFileUploadXmlns = 'urn:xmpp:http:upload:0';
 // XEP-0372
 const referenceXmlns = 'urn:xmpp:reference:0';
 
-// XEP-380
+// XEP-0380
 const emeXmlns = 'urn:xmpp:eme:0';
 const emeOtr = 'urn:xmpp:otr:0';
 const emeLegacyOpenPGP = 'jabber:x:encrypted';

packages/moxxmpp/lib/src/negotiators/manager.dart

@@ -1 +0,0 @@
-

packages/moxxmpp/lib/src/negotiators/namespaces.dart

@@ -11,3 +11,4 @@ const sasl2Negotiator = 'org.moxxmpp.sasl.sasl2';
 const bind2Negotiator = 'org.moxxmpp.bind2';
 const saslFASTNegotiator = 'org.moxxmpp.sasl.fast';
 const carbonsNegotiator = 'org.moxxmpp.bind2.carbons';
+const presenceNegotiator = 'org.moxxmpp.core.presence';

packages/moxxmpp/lib/src/presence.dart

@@ -6,14 +6,44 @@ import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
 import 'package:moxxmpp/src/namespaces.dart';
+import 'package:moxxmpp/src/negotiators/namespaces.dart';
+import 'package:moxxmpp/src/negotiators/negotiator.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/types/result.dart';
 
 /// A function that will be called when presence, outside of subscription request
 /// management, will be sent. Useful for managers that want to add [XMLNode]s to said
 /// presence.
 typedef PresencePreSendCallback = Future<List<XMLNode>> Function();
 
+/// A pseudo-negotiator that does not really negotiate anything. Instead, its purpose
+/// is to look for a stream feature indicating that we can pre-approve subscription
+/// requests, shown by [PresenceNegotiator.preApprovalSupported].
+class PresenceNegotiator extends XmppFeatureNegotiatorBase {
+  PresenceNegotiator()
+      : super(11, false, subscriptionPreApprovalXmlns, presenceNegotiator);
+
+  /// Flag indicating whether presence subscription pre-approval is supported
+  bool _supported = false;
+  bool get preApprovalSupported => _supported;
+
+  @override
+  Future<Result<NegotiatorState, NegotiatorError>> negotiate(
+    XMLNode nonza,
+  ) async {
+    _supported = true;
+    return const Result(NegotiatorState.done);
+  }
+
+  @override
+  void reset() {
+    _supported = false;
+
+    super.reset();
+  }
+}
+
 /// A mandatory manager that handles initial presence sending, sending of subscription
 /// request management requests and triggers events for incoming presence stanzas.
 class PresenceManager extends XmppManagerBase {
@@ -23,11 +53,17 @@ class PresenceManager extends XmppManagerBase {
   final List<PresencePreSendCallback> _presenceCallbacks =
       List.empty(growable: true);
 
+  /// The priority of the presence handler. If a handler should run before this one,
+  /// which terminates processing, make sure the handler has a priority greater than
+  /// [presenceHandlerPriority].
+  static int presenceHandlerPriority = -100;
+
   @override
   List<StanzaHandler> getIncomingStanzaHandlers() => [
         StanzaHandler(
           stanzaTag: 'presence',
           callback: _onPresence,
+          priority: presenceHandlerPriority,
         )
       ];
 
@@ -66,7 +102,7 @@ class PresenceManager extends XmppManagerBase {
               from: JID.fromString(presence.from!),
             ),
           );
-          return state.copyWith(done: true);
+          return state..done = true;
         }
       default:
         break;
@@ -75,10 +111,7 @@ class PresenceManager extends XmppManagerBase {
     if (presence.from != null) {
       logger.finest("Received presence from '${presence.from}'");
 
-      getAttributes().sendEvent(
-        PresenceReceivedEvent(JID.fromString(presence.from!), presence),
-      );
-      return state.copyWith(done: true);
+      return state..done = true;
     }
 
     return state;
@@ -128,13 +161,39 @@ class PresenceManager extends XmppManagerBase {
     );
   }
 
-  /// Sends a subscription request to [to].
-  // TODO(PapaTutuWawa): Check if we're allowed to pre-approve
-  Future<void> requestSubscription(JID to, {bool preApprove = false}) async {
+  /// Similar to [requestSubscription], but it also tells the server to automatically
+  /// accept a subscription request from [to], should it arrive.
+  /// This requires a [PresenceNegotiator] to be registered as this feature is optional.
+  ///
+  /// Returns true, when the stanza was sent. Returns false, when the stanza was not sent,
+  /// for example because the server does not support subscription pre-approvals.
+  Future<bool> preApproveSubscription(JID to) async {
+    final negotiator = getAttributes()
+        .getNegotiatorById<PresenceNegotiator>(presenceNegotiator);
+    assert(negotiator != null, 'No PresenceNegotiator registered');
+
+    if (!negotiator!.preApprovalSupported) {
+      return false;
+    }
+
     await getAttributes().sendStanza(
       StanzaDetails(
         Stanza.presence(
-          type: preApprove ? 'subscribed' : 'subscribe',
+          type: 'subscribed',
+          to: to.toString(),
+        ),
+        awaitable: false,
+      ),
+    );
+    return true;
+  }
+
+  /// Sends a subscription request to [to].
+  Future<void> requestSubscription(JID to) async {
+    await getAttributes().sendStanza(
+      StanzaDetails(
+        Stanza.presence(
+          type: 'subscribe',
           to: to.toString(),
         ),
         awaitable: false,
@@ -144,7 +203,15 @@ class PresenceManager extends XmppManagerBase {
 
   /// Accept a subscription request from [to].
   Future<void> acceptSubscriptionRequest(JID to) async {
-    await requestSubscription(to, preApprove: true);
+    await getAttributes().sendStanza(
+      StanzaDetails(
+        Stanza.presence(
+          type: 'subscribed',
+          to: to.toString(),
+        ),
+        awaitable: false,
+      ),
+    );
   }
 
   /// Send a subscription request rejection to [to].

packages/moxxmpp/lib/src/roster/roster.dart

@@ -145,7 +145,7 @@ class RosterManager extends XmppManagerBase {
       logger.warning(
         'Roster push invalid! Unexpected from attribute: ${stanza.toXml()}',
       );
-      return state.copyWith(done: true);
+      return state..done = true;
     }
 
     final query = stanza.firstTag('query', xmlns: rosterXmlns)!;
@@ -154,7 +154,7 @@ class RosterManager extends XmppManagerBase {
 
     if (item == null) {
       logger.warning('Received empty roster push');
-      return state.copyWith(done: true);
+      return state..done = true;
     }
 
     unawaited(
@@ -177,7 +177,7 @@ class RosterManager extends XmppManagerBase {
       [],
     );
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
   /// Shared code between requesting rosters without and with roster versioning, if

packages/moxxmpp/lib/src/util/typed_map.dart

@@ -0,0 +1,23 @@
+/// A map, similar to Map, but always uses the type of the value as the key.
+class TypedMap<B> {
+  /// Create an empty typed map.
+  TypedMap();
+
+  /// Create a typed map from a list of values.
+  TypedMap.fromList(List<B> items) {
+    for (final item in items) {
+      _data[item.runtimeType] = item;
+    }
+  }
+
+  /// The internal mapping of type -> data
+  final Map<Object, B> _data = {};
+
+  /// Associate the type of [value] with [value] in the map.
+  void set<T extends B>(T value) {
+    _data[T] = value;
+  }
+
+  /// Return the object of type [T] from the map, if it has been stored.
+  T? get<T>() => _data[T] as T?;
+}

packages/moxxmpp/lib/src/xeps/staging/file_upload_notification.dart

@@ -2,14 +2,70 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
+import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 import 'package:moxxmpp/src/xeps/xep_0446.dart';
 
 /// NOTE: Specified by https://github.com/PapaTutuWawa/custom-xeps/blob/master/xep-xxxx-file-upload-notifications.md
-
 const fileUploadNotificationXmlns = 'proto:urn:xmpp:fun:0';
 
+/// Indicates a file upload notification.
+class FileUploadNotificationData implements StanzaHandlerExtension {
+  const FileUploadNotificationData(this.metadata);
+
+  /// The file metadata indicated in the upload notification.
+  final FileMetadataData metadata;
+
+  XMLNode toXML() {
+    return XMLNode.xmlns(
+      tag: 'file-upload',
+      xmlns: fileUploadNotificationXmlns,
+      children: [
+        metadata.toXML(),
+      ],
+    );
+  }
+}
+
+/// Indicates that a file upload has been cancelled.
+class FileUploadNotificationCancellationData implements StanzaHandlerExtension {
+  const FileUploadNotificationCancellationData(this.id);
+
+  /// The id of the upload notifiaction that is cancelled.
+  final String id;
+
+  XMLNode toXML() {
+    return XMLNode.xmlns(
+      tag: 'cancelled',
+      xmlns: fileUploadNotificationXmlns,
+      attributes: {
+        'id': id,
+      },
+    );
+  }
+}
+
+/// Indicates that a file upload has been completed.
+class FileUploadNotificationReplacementData implements StanzaHandlerExtension {
+  const FileUploadNotificationReplacementData(this.id);
+
+  /// The id of the upload notifiaction that is replaced.
+  final String id;
+
+  XMLNode toXML() {
+    return XMLNode.xmlns(
+      tag: 'replaces',
+      xmlns: fileUploadNotificationXmlns,
+      attributes: {
+        'id': id,
+      },
+    );
+  }
+}
+
 class FileUploadNotificationManager extends XmppManagerBase {
   FileUploadNotificationManager() : super(fileUploadNotificationManager);
 
@@ -47,10 +103,13 @@ class FileUploadNotificationManager extends XmppManagerBase {
   ) async {
     final funElement =
         message.firstTag('file-upload', xmlns: fileUploadNotificationXmlns)!;
-    return state.copyWith(
-      fun: FileMetadataData.fromXML(
+    return state
+      ..extensions.set(
+        FileUploadNotificationData(
+          FileMetadataData.fromXML(
             funElement.firstTag('file', xmlns: fileMetadataXmlns)!,
           ),
+        ),
       );
   }
 
@@ -60,8 +119,11 @@ class FileUploadNotificationManager extends XmppManagerBase {
   ) async {
     final element =
         message.firstTag('replaces', xmlns: fileUploadNotificationXmlns)!;
-    return state.copyWith(
-      funReplacement: element.attributes['id']! as String,
+    return state
+      ..extensions.set(
+        FileUploadNotificationReplacementData(
+          element.attributes['id']! as String,
+        ),
       );
   }
 
@@ -71,8 +133,42 @@ class FileUploadNotificationManager extends XmppManagerBase {
   ) async {
     final element =
         message.firstTag('cancels', xmlns: fileUploadNotificationXmlns)!;
-    return state.copyWith(
-      funCancellation: element.attributes['id']! as String,
+    return state
+      ..extensions.set(
+        FileUploadNotificationCancellationData(
+          element.attributes['id']! as String,
+        ),
       );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final fun = extensions.get<FileUploadNotificationData>();
+    if (fun != null) {
+      return [fun.toXML()];
+    }
+
+    final cancel = extensions.get<FileUploadNotificationCancellationData>();
+    if (cancel != null) {
+      return [cancel.toXML()];
+    }
+
+    final replace = extensions.get<FileUploadNotificationReplacementData>();
+    if (replace != null) {
+      return [replace.toXML()];
+    }
+
+    return [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0030/xep_0030.dart

@@ -184,7 +184,7 @@ class DiscoManager extends XmppManagerBase {
         ],
       );
 
-      return state.copyWith(done: true);
+      return state..done = true;
     }
 
     await reply(
@@ -195,7 +195,7 @@ class DiscoManager extends XmppManagerBase {
       ],
     );
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
   Future<StanzaHandlerData> _onDiscoItemsRequest(
@@ -223,7 +223,7 @@ class DiscoManager extends XmppManagerBase {
         ],
       );
 
-      return state.copyWith(done: true);
+      return state..done = true;
     }
 
     return state;

packages/moxxmpp/lib/src/xeps/xep_0054.dart

@@ -76,7 +76,7 @@ class VCardManager extends XmppManagerBase {
       }
     }
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
   VCardPhoto? _parseVCardPhoto(XMLNode? node) {

packages/moxxmpp/lib/src/xeps/xep_0060/xep_0060.dart

@@ -114,7 +114,7 @@ class PubSubManager extends XmppManagerBase {
       ),
     );
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
   Future<int> _getNodeItemCount(JID jid, String node) async {

packages/moxxmpp/lib/src/xeps/xep_0066.dart

@@ -2,32 +2,32 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
 /// A data class representing the jabber:x:oob tag.
-class OOBData {
-  const OOBData({this.url, this.desc});
+class OOBData implements StanzaHandlerExtension {
+  const OOBData(this.url, this.desc);
+
+  /// The communicated URL of the OOB data
   final String? url;
+
+  /// The description of the url.
   final String? desc;
-}
-
-XMLNode constructOOBNode(OOBData data) {
-  final children = List<XMLNode>.empty(growable: true);
-
-  if (data.url != null) {
-    children.add(XMLNode(tag: 'url', text: data.url));
-  }
-  if (data.desc != null) {
-    children.add(XMLNode(tag: 'desc', text: data.desc));
-  }
 
+  XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'x',
       xmlns: oobDataXmlns,
-    children: children,
+      children: [
+        if (url != null) XMLNode(tag: 'url', text: url),
+        if (desc != null) XMLNode(tag: 'desc', text: desc),
+      ],
     );
+  }
 }
 
 class OOBManager extends XmppManagerBase {
@@ -59,11 +59,33 @@ class OOBManager extends XmppManagerBase {
     final url = x.firstTag('url');
     final desc = x.firstTag('desc');
 
-    return state.copyWith(
-      oob: OOBData(
-        url: url?.innerText(),
-        desc: desc?.innerText(),
+    return state
+      ..extensions.set(
+        OOBData(
+          url?.innerText(),
+          desc?.innerText(),
         ),
       );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<OOBData>();
+    return data != null
+        ? [
+            data.toXML(),
+          ]
+        : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0085.dart

@@ -2,43 +2,59 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-enum ChatState { active, composing, paused, inactive, gone }
+enum ChatState implements StanzaHandlerExtension {
+  active,
+  composing,
+  paused,
+  inactive,
+  gone;
 
-ChatState chatStateFromString(String raw) {
-  switch (raw) {
+  factory ChatState.fromName(String state) {
+    switch (state) {
       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;
+
+    throw Exception('Invalid chat state $state');
   }
+
+  String toName() {
+    switch (this) {
+      case ChatState.active:
+        return 'active';
+      case ChatState.composing:
+        return 'composing';
+      case ChatState.paused:
+        return 'paused';
+      case ChatState.inactive:
+        return 'inactive';
+      case ChatState.gone:
+        return 'gone';
+    }
+  }
+
+  XMLNode toXML() {
+    return XMLNode.xmlns(
+      tag: toName(),
+      xmlns: chatStateXmlns,
+    );
   }
 }
 
-String chatStateToString(ChatState state) => state.toString().split('.').last;
-
 class ChatStateManager extends XmppManagerBase {
   ChatStateManager() : super(chatStateManager);
 
@@ -64,62 +80,55 @@ class ChatStateManager extends XmppManagerBase {
     StanzaHandlerData state,
   ) async {
     final element = state.stanza.firstTagByXmlns(chatStateXmlns)!;
-    ChatState? chatState;
 
-    switch (element.tag) {
-      case 'active':
-        {
-          chatState = ChatState.active;
-        }
-        break;
-      case 'composing':
-        {
-          chatState = ChatState.composing;
-        }
-        break;
-      case 'paused':
-        {
-          chatState = ChatState.paused;
-        }
-        break;
-      case 'inactive':
-        {
-          chatState = ChatState.inactive;
-        }
-        break;
-      case 'gone':
-        {
-          chatState = ChatState.gone;
-        }
-        break;
-      default:
-        {
-          logger.warning("Received invalid chat state '${element.tag}'");
-        }
+    try {
+      state.extensions.set(ChatState.fromName(element.tag));
+    } catch (_) {
+      logger.finest('Ignoring invalid chat state ${element.tag}');
     }
 
-    return state.copyWith(chatState: chatState);
+    return state;
   }
 
   /// Send a chat state notification to [to]. You can specify the type attribute
   /// of the message with [messageType].
-  void sendChatState(
+  Future<void> sendChatState(
     ChatState state,
     String to, {
     String messageType = 'chat',
-  }) {
-    final tagName = state.toString().split('.').last;
-
-    getAttributes().sendStanza(
+  }) async {
+    await getAttributes().sendStanza(
       StanzaDetails(
         Stanza.message(
           to: to,
           type: messageType,
           children: [
-            XMLNode.xmlns(tag: tagName, xmlns: chatStateXmlns),
+            state.toXML(),
           ],
         ),
+        awaitable: false,
       ),
     );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<ChatState>();
+    return data != null
+        ? [
+            data.toXML(),
+          ]
+        : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0115.dart

@@ -4,10 +4,13 @@ import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/base.dart';
+import 'package:moxxmpp/src/managers/data.dart';
+import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/presence.dart';
 import 'package:moxxmpp/src/rfcs/rfc_4790.dart';
+import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/util/list.dart';
 import 'package:moxxmpp/src/xeps/xep_0004.dart';
@@ -105,7 +108,20 @@ class EntityCapabilitiesManager extends XmppManagerBase {
   Future<bool> isSupported() async => true;
 
   @override
-  List<String> getDiscoFeatures() => [capsXmlns];
+  List<String> getDiscoFeatures() => [
+        capsXmlns,
+      ];
+
+  @override
+  List<StanzaHandler> getIncomingStanzaHandlers() => [
+        StanzaHandler(
+          stanzaTag: 'presence',
+          tagName: 'c',
+          tagXmlns: capsXmlns,
+          callback: onPresence,
+          priority: PresenceManager.presenceHandlerPriority + 1,
+        ),
+      ];
 
   /// Computes, if required, the capability hash of the data provided by
   /// the DiscoManager.
@@ -159,33 +175,38 @@ class EntityCapabilitiesManager extends XmppManagerBase {
   }
 
   @visibleForTesting
-  Future<void> onPresence(PresenceReceivedEvent event) async {
-    final c = event.presence.firstTag('c', xmlns: capsXmlns);
-    if (c == null) {
-      return;
+  Future<StanzaHandlerData> onPresence(
+    Stanza stanza,
+    StanzaHandlerData state,
+  ) async {
+    if (stanza.from == null) {
+      return state;
     }
 
+    final from = JID.fromString(stanza.from!);
+    final c = stanza.firstTag('c', xmlns: capsXmlns)!;
+
     final hashFunctionName = c.attributes['hash'] as String?;
     final capabilityNode = c.attributes['node'] as String?;
     final ver = c.attributes['ver'] as String?;
     if (hashFunctionName == null || capabilityNode == null || ver == null) {
-      return;
+      return state;
     }
 
     // Check if we know of the hash
     final isCached =
         await _cacheLock.synchronized(() => _capHashCache.containsKey(ver));
     if (isCached) {
-      return;
+      return state;
     }
 
     final dm = getAttributes().getManagerById<DiscoManager>(discoManager)!;
     final discoRequest = await dm.discoInfoQuery(
-      event.jid,
+      from,
       node: capabilityNode,
     );
     if (discoRequest.isType<DiscoError>()) {
-      return;
+      return state;
     }
     final discoInfo = discoRequest.get<DiscoInfo>();
 
@@ -194,13 +215,13 @@ class EntityCapabilitiesManager extends XmppManagerBase {
       await dm.addCachedDiscoInfo(
         MapEntry<DiscoCacheKey, DiscoInfo>(
           DiscoCacheKey(
-            event.jid,
+            from,
             null,
           ),
           discoInfo,
         ),
       );
-      return;
+      return state;
     }
 
     // Validate the disco#info result according to XEP-0115 § 5.4
@@ -214,7 +235,7 @@ class EntityCapabilitiesManager extends XmppManagerBase {
         logger.warning(
           'Malformed disco#info response: More than one equal identity',
         );
-        return;
+        return state;
       }
     }
 
@@ -225,7 +246,7 @@ class EntityCapabilitiesManager extends XmppManagerBase {
         logger.warning(
           'Malformed disco#info response: More than one equal feature',
         );
-        return;
+        return state;
       }
     }
 
@@ -253,7 +274,7 @@ class EntityCapabilitiesManager extends XmppManagerBase {
           logger.warning(
             'Malformed disco#info response: Extended Info FORM_TYPE contains more than one value(s) of different value.',
           );
-          return;
+          return state;
         }
       }
 
@@ -268,7 +289,7 @@ class EntityCapabilitiesManager extends XmppManagerBase {
         logger.warning(
           'Malformed disco#info response: More than one Extended Disco Info forms with the same FORM_TYPE value',
         );
-        return;
+        return state;
       }
 
       // Check if the field type is hidden
@@ -297,14 +318,16 @@ class EntityCapabilitiesManager extends XmppManagerBase {
 
     if (computedCapabilityHash == ver) {
       await _cacheLock.synchronized(() {
-        _jidToCapHashCache[event.jid.toString()] = ver;
+        _jidToCapHashCache[from.toString()] = ver;
         _capHashCache[ver] = newDiscoInfo;
       });
     } else {
       logger.warning(
-        'Capability hash mismatch from ${event.jid}: Received "$ver", expected "$computedCapabilityHash".',
+        'Capability hash mismatch from $from: Received "$ver", expected "$computedCapabilityHash".',
       );
     }
+
+    return state;
   }
 
   @visibleForTesting
@@ -315,9 +338,7 @@ class EntityCapabilitiesManager extends XmppManagerBase {
 
   @override
   Future<void> onXmppEvent(XmppEvent event) async {
-    if (event is PresenceReceivedEvent) {
-      unawaited(onPresence(event));
-    } else if (event is StreamNegotiationsDoneEvent) {
+    if (event is StreamNegotiationsDoneEvent) {
       // Clear the JID to cap. hash mapping.
       await _cacheLock.synchronized(_jidToCapHashCache.clear);
     }

packages/moxxmpp/lib/src/xeps/xep_0184.dart

@@ -4,23 +4,43 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-XMLNode makeMessageDeliveryRequest() {
+class MessageDeliveryReceiptData implements StanzaHandlerExtension {
+  const MessageDeliveryReceiptData(this.receiptRequested);
+
+  /// Indicates whether a delivery receipt is requested or not.
+  final bool receiptRequested;
+
+  XMLNode toXML() {
+    assert(
+      receiptRequested,
+      'This method makes little sense with receiptRequested == false',
+    );
     return XMLNode.xmlns(
       tag: 'request',
       xmlns: deliveryXmlns,
     );
+  }
 }
 
-XMLNode makeMessageDeliveryResponse(String id) {
+class MessageDeliveryReceivedData implements StanzaHandlerExtension {
+  const MessageDeliveryReceivedData(this.id);
+
+  /// The stanza id of the message we received.
+  final String id;
+
+  XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'received',
       xmlns: deliveryXmlns,
       attributes: {'id': id},
     );
+  }
 }
 
 class MessageDeliveryReceiptManager extends XmppManagerBase {
@@ -56,7 +76,7 @@ class MessageDeliveryReceiptManager extends XmppManagerBase {
     Stanza message,
     StanzaHandlerData state,
   ) async {
-    return state.copyWith(deliveryReceiptRequested: true);
+    return state..extensions.set(const MessageDeliveryReceiptData(true));
   }
 
   Future<StanzaHandlerData> _onDeliveryReceiptReceived(
@@ -64,16 +84,16 @@ class MessageDeliveryReceiptManager extends XmppManagerBase {
     StanzaHandlerData state,
   ) async {
     final received = message.firstTag('received', xmlns: deliveryXmlns)!;
-    for (final item in message.children) {
-      if (!['origin-id', 'stanza-id', 'delay', 'store', 'received']
-          .contains(item.tag)) {
-        logger.info(
-          "Won't handle stanza as delivery receipt because we found an '${item.tag}' element",
-        );
+    // for (final item in message.children) {
+    //   if (!['origin-id', 'stanza-id', 'delay', 'store', 'received']
+    //       .contains(item.tag)) {
+    //     logger.info(
+    //       "Won't handle stanza as delivery receipt because we found an '${item.tag}' element",
+    //     );
 
-        return state.copyWith(done: true);
-      }
-    }
+    //     return state.copyWith(done: true);
+    //   }
+    // }
 
     getAttributes().sendEvent(
       DeliveryReceiptReceivedEvent(
@@ -81,6 +101,27 @@ class MessageDeliveryReceiptManager extends XmppManagerBase {
         id: received.attributes['id']! as String,
       ),
     );
-    return state.copyWith(done: true);
+    return state..done = true;
+  }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<MessageDeliveryReceivedData>();
+    return data != null
+        ? [
+            data.toXML(),
+          ]
+        : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
   }
 }

packages/moxxmpp/lib/src/xeps/xep_0191.dart

@@ -70,7 +70,7 @@ class BlockingManager extends XmppManagerBase {
       ),
     );
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
   Future<StanzaHandlerData> _unblockPush(
@@ -92,7 +92,7 @@ class BlockingManager extends XmppManagerBase {
       );
     }
 
-    return state.copyWith(done: true);
+    return state..done = true;
   }
 
   Future<bool> block(List<String> items) async {

packages/moxxmpp/lib/src/xeps/xep_0198/types.dart

@@ -0,0 +1,8 @@
+import 'package:moxxmpp/src/managers/data.dart';
+
+class StreamManagementData implements StanzaHandlerExtension {
+  const StreamManagementData(this.exclude);
+
+  /// Whether the stanza should be exluded from the StreamManagement's resend queue.
+  final bool exclude;
+}

packages/moxxmpp/lib/src/xeps/xep_0198/xep_0198.dart

@@ -15,6 +15,7 @@ import 'package:moxxmpp/src/xeps/xep_0198/errors.dart';
 import 'package:moxxmpp/src/xeps/xep_0198/negotiator.dart';
 import 'package:moxxmpp/src/xeps/xep_0198/nonzas.dart';
 import 'package:moxxmpp/src/xeps/xep_0198/state.dart';
+import 'package:moxxmpp/src/xeps/xep_0198/types.dart';
 import 'package:synchronized/synchronized.dart';
 
 const xmlUintMax = 4294967296; // 2**32
@@ -402,7 +403,9 @@ class StreamManagementManager extends XmppManagerBase {
     if (isStreamManagementEnabled()) {
       await _incrementC2S();
 
-      if (state.excludeFromStreamManagement) return state;
+      if (state.extensions.get<StreamManagementData>()?.exclude ?? false) {
+        return state;
+      }
 
       _unackedStanzas[_state.c2s] = stanza;
       await _sendAckRequest();

packages/moxxmpp/lib/src/xeps/xep_0203.dart

@@ -1,4 +1,5 @@
 import 'package:meta/meta.dart';
+import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
@@ -7,10 +8,14 @@ import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 
 @immutable
-class DelayedDelivery {
-  const DelayedDelivery(this.from, this.timestamp);
+class DelayedDeliveryData implements StanzaHandlerExtension {
+  const DelayedDeliveryData(this.from, this.timestamp);
+
+  /// The timestamp the message was originally sent.
   final DateTime timestamp;
-  final String from;
+
+  /// The JID that originally sent the message.
+  final JID from;
 }
 
 class DelayedDeliveryManager extends XmppManagerBase {
@@ -23,6 +28,8 @@ class DelayedDeliveryManager extends XmppManagerBase {
   List<StanzaHandler> getIncomingStanzaHandlers() => [
         StanzaHandler(
           stanzaTag: 'message',
+          tagName: 'delay',
+          tagXmlns: delayedDeliveryXmlns,
           callback: _onIncomingMessage,
           priority: 200,
         ),
@@ -32,12 +39,12 @@ class DelayedDeliveryManager extends XmppManagerBase {
     Stanza stanza,
     StanzaHandlerData state,
   ) async {
-    final delay = stanza.firstTag('delay', xmlns: delayedDeliveryXmlns);
-    if (delay == null) return state;
+    final delay = stanza.firstTag('delay', xmlns: delayedDeliveryXmlns)!;
 
-    return state.copyWith(
-      delayedDelivery: DelayedDelivery(
-        delay.attributes['from']! as String,
+    return state
+      ..extensions.set(
+        DelayedDeliveryData(
+          JID.fromString(delay.attributes['from']! as String),
           DateTime.parse(delay.attributes['stamp']! as String),
         ),
       );

packages/moxxmpp/lib/src/xeps/xep_0280.dart

@@ -14,6 +14,13 @@ import 'package:moxxmpp/src/xeps/xep_0030/xep_0030.dart';
 import 'package:moxxmpp/src/xeps/xep_0297.dart';
 import 'package:moxxmpp/src/xeps/xep_0386.dart';
 
+class CarbonsData implements StanzaHandlerExtension {
+  const CarbonsData(this.isCarbon);
+
+  /// Indicates whether this message is a carbon.
+  final bool isCarbon;
+}
+
 /// This manager class implements support for XEP-0280.
 class CarbonsManager extends XmppManagerBase {
   CarbonsManager() : super(carbonsManager);
@@ -77,15 +84,14 @@ class CarbonsManager extends XmppManagerBase {
   ) async {
     final from = JID.fromString(message.attributes['from']! as String);
     final received = message.firstTag('received', xmlns: carbonsXmlns)!;
-    if (!isCarbonValid(from)) return state.copyWith(done: true);
+    if (!isCarbonValid(from)) return state..done = true;
 
     final forwarded = received.firstTag('forwarded', xmlns: forwardedXmlns)!;
     final carbon = unpackForwarded(forwarded);
 
-    return state.copyWith(
-      isCarbon: true,
-      stanza: carbon,
-    );
+    return state
+      ..extensions.set(const CarbonsData(true))
+      ..stanza = carbon;
   }
 
   Future<StanzaHandlerData> _onMessageSent(
@@ -94,15 +100,14 @@ class CarbonsManager extends XmppManagerBase {
   ) async {
     final from = JID.fromString(message.attributes['from']! as String);
     final sent = message.firstTag('sent', xmlns: carbonsXmlns)!;
-    if (!isCarbonValid(from)) return state.copyWith(done: true);
+    if (!isCarbonValid(from)) return state..done = true;
 
     final forwarded = sent.firstTag('forwarded', xmlns: forwardedXmlns)!;
     final carbon = unpackForwarded(forwarded);
 
-    return state.copyWith(
-      isCarbon: true,
-      stanza: carbon,
-    );
+    return state
+      ..extensions.set(const CarbonsData(true))
+      ..stanza = carbon;
   }
 
   /// Send a request to the server, asking it to enable Message Carbons.

packages/moxxmpp/lib/src/xeps/xep_0300.dart

@@ -66,7 +66,7 @@ enum HashFunction {
         return HashFunction.blake2b512;
     }
 
-    throw Exception();
+    throw Exception('Invalid hash function $name');
   }
 
   /// Like [HashFunction.fromName], but returns null if the hash function is unknown

packages/moxxmpp/lib/src/xeps/xep_0308.dart

@@ -2,18 +2,27 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-XMLNode makeLastMessageCorrectionEdit(String id) {
+class LastMessageCorrectionData implements StanzaHandlerExtension {
+  const LastMessageCorrectionData(this.id);
+
+  /// The id the LMC applies to.
+  final String id;
+
+  XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'replace',
       xmlns: lmcXmlns,
-    attributes: <String, String>{
+      attributes: {
         'id': id,
       },
     );
+  }
 }
 
 class LastMessageCorrectionManager extends XmppManagerBase {
@@ -42,8 +51,30 @@ class LastMessageCorrectionManager extends XmppManagerBase {
     StanzaHandlerData state,
   ) async {
     final edit = stanza.firstTag('replace', xmlns: lmcXmlns)!;
-    return state.copyWith(
-      lastMessageCorrectionSid: edit.attributes['id']! as String,
+    return state
+      ..extensions.set(
+        LastMessageCorrectionData(edit.attributes['id']! as String),
       );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<LastMessageCorrectionData>();
+    return data != null
+        ? [
+            data.toXML(),
+          ]
+        : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0333.dart

@@ -4,27 +4,86 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
+
+enum ChatMarker {
+  received,
+  displayed,
+  acknowledged;
+
+  factory ChatMarker.fromName(String name) {
+    switch (name) {
+      case 'received':
+        return ChatMarker.received;
+      case 'displayed':
+        return ChatMarker.displayed;
+      case 'acknowledged':
+        return ChatMarker.acknowledged;
+    }
+
+    throw Exception('Invalid chat marker $name');
+  }
+
+  XMLNode toXML() {
+    String tag;
+    switch (this) {
+      case ChatMarker.received:
+        tag = 'received';
+        break;
+      case ChatMarker.displayed:
+        tag = 'displayed';
+        break;
+      case ChatMarker.acknowledged:
+        tag = 'acknowledged';
+        break;
+    }
+
+    return XMLNode.xmlns(
+      tag: tag,
+      xmlns: chatMarkersXmlns,
+    );
+  }
+}
+
+class MarkableData implements StanzaHandlerExtension {
+  const MarkableData(this.isMarkable);
+
+  /// Indicates whether the message can be replied to with a chat marker.
+  final bool isMarkable;
+
+  XMLNode toXML() {
+    assert(isMarkable, '');
 
-XMLNode makeChatMarkerMarkable() {
     return XMLNode.xmlns(
       tag: 'markable',
       xmlns: chatMarkersXmlns,
     );
+  }
 }
 
-XMLNode makeChatMarker(String tag, String id) {
-  assert(
-    ['received', 'displayed', 'acknowledged'].contains(tag),
-    'Invalid chat marker',
-  );
+class ChatMarkerData implements StanzaHandlerExtension {
+  const ChatMarkerData(this.marker, this.id);
+
+  /// The actual chat state
+  final ChatMarker marker;
+
+  /// The ID the chat marker applies to
+  final String id;
+
+  XMLNode toXML() {
+    final tag = marker.toXML();
     return XMLNode.xmlns(
-    tag: tag,
+      tag: tag.tag,
       xmlns: chatMarkersXmlns,
-    attributes: {'id': id},
+      attributes: {
+        'id': id,
+      },
     );
+  }
 }
 
 class ChatMarkerManager extends XmppManagerBase {
@@ -51,23 +110,52 @@ class ChatMarkerManager extends XmppManagerBase {
     Stanza message,
     StanzaHandlerData state,
   ) async {
-    final marker = message.firstTagByXmlns(chatMarkersXmlns)!;
+    final element = message.firstTagByXmlns(chatMarkersXmlns)!;
 
     // Handle the <markable /> explicitly
-    if (marker.tag == 'markable') return state.copyWith(isMarkable: true);
+    if (element.tag == 'markable') {
+      return state..extensions.set(const MarkableData(true));
+    }
 
-    if (!['received', 'displayed', 'acknowledged'].contains(marker.tag)) {
-      logger.warning("Unknown message marker '${marker.tag}' found.");
-    } else {
+    try {
       getAttributes().sendEvent(
         ChatMarkerEvent(
-          from: JID.fromString(message.from!),
-          type: marker.tag,
-          id: marker.attributes['id']! as String,
+          JID.fromString(message.from!),
+          ChatMarker.fromName(element.tag),
+          element.attributes['id']! as String,
         ),
       );
+    } catch (_) {
+      logger.warning("Unknown message marker '${element.tag}' found.");
     }
 
-    return state.copyWith(done: true);
+    return state..done = true;
+  }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final children = List<XMLNode>.empty(growable: true);
+    final marker = extensions.get<ChatMarkerData>();
+    if (marker != null) {
+      children.add(marker.toXML());
+    }
+
+    final markable = extensions.get<MarkableData>();
+    if (markable != null) {
+      children.add(markable.toXML());
+    }
+
+    return children;
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
   }
 }

packages/moxxmpp/lib/src/xeps/xep_0334.dart

@@ -1,15 +1,21 @@
+import 'package:moxxmpp/src/managers/base.dart';
+import 'package:moxxmpp/src/managers/data.dart';
+import 'package:moxxmpp/src/managers/handlers.dart';
+import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
+import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
 enum MessageProcessingHint {
   noPermanentStore,
   noStore,
   noCopies,
-  store,
-}
+  store;
 
-MessageProcessingHint messageProcessingHintFromXml(XMLNode element) {
-  switch (element.tag) {
+  factory MessageProcessingHint.fromName(String name) {
+    switch (name) {
       case 'no-permanent-store':
         return MessageProcessingHint.noPermanentStore;
       case 'no-store':
@@ -20,12 +26,11 @@ MessageProcessingHint messageProcessingHintFromXml(XMLNode element) {
         return MessageProcessingHint.store;
     }
 
-  assert(false, 'Invalid Message Processing Hint: ${element.tag}');
+    assert(false, 'Invalid Message Processing Hint: $name');
     return MessageProcessingHint.noStore;
-}
+  }
 
-extension XmlExtension on MessageProcessingHint {
-  XMLNode toXml() {
+  XMLNode toXML() {
     String tag;
     switch (this) {
       case MessageProcessingHint.noPermanentStore:
@@ -48,3 +53,60 @@ extension XmlExtension on MessageProcessingHint {
     );
   }
 }
+
+class MessageProcessingHintData implements StanzaHandlerExtension {
+  const MessageProcessingHintData(this.hints);
+
+  /// The attached message processing hints.
+  final List<MessageProcessingHint> hints;
+}
+
+class MessageProcessingHintManager extends XmppManagerBase {
+  MessageProcessingHintManager() : super(messageProcessingHintManager);
+
+  @override
+  Future<bool> isSupported() async => true;
+
+  @override
+  List<StanzaHandler> getIncomingStanzaHandlers() => [
+        StanzaHandler(
+          stanzaTag: 'message',
+          tagXmlns: messageProcessingHintsXmlns,
+          callback: _onMessage,
+          // Before the message handler
+          priority: -99,
+        ),
+      ];
+
+  Future<StanzaHandlerData> _onMessage(
+    Stanza stanza,
+    StanzaHandlerData state,
+  ) async {
+    final elements = stanza.findTagsByXmlns(messageProcessingHintsXmlns);
+    return state
+      ..extensions.set(
+        MessageProcessingHintData(
+          elements
+              .map((element) => MessageProcessingHint.fromName(element.tag))
+              .toList(),
+        ),
+      );
+  }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<MessageProcessingHintData>();
+    return data != null ? data.hints.map((hint) => hint.toXML()).toList() : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
+}

packages/moxxmpp/lib/src/xeps/xep_0359.dart

@@ -3,9 +3,11 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
 /// Representation of a <stanza-id /> element.
 class StanzaId {
@@ -20,7 +22,7 @@ class StanzaId {
   /// The JID the id was generated by.
   final JID by;
 
-  XMLNode toXml() {
+  XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'stanza-id',
       xmlns: stableIdXmlns,
@@ -32,12 +34,38 @@ class StanzaId {
   }
 }
 
-XMLNode makeOriginIdElement(String id) {
+class StableIdData implements StanzaHandlerExtension {
+  const StableIdData(this.originId, this.stanzaIds);
+
+  /// <origin-id />
+  final String? originId;
+
+  /// Stanza ids
+  final List<StanzaId>? stanzaIds;
+
+  XMLNode toOriginIdElement() {
+    assert(
+      originId != null,
+      'Can only build the XML element if originId != null',
+    );
     return XMLNode.xmlns(
       tag: 'origin-id',
       xmlns: stableIdXmlns,
-    attributes: {'id': id},
+      attributes: {'id': originId!},
     );
+  }
+
+  List<XMLNode> toXML() {
+    return [
+      if (originId != null)
+        XMLNode.xmlns(
+          tag: 'origin-id',
+          xmlns: stableIdXmlns,
+          attributes: {'id': originId!},
+        ),
+      if (stanzaIds != null) ...stanzaIds!.map((s) => s.toXML()),
+    ];
+  }
 }
 
 class StableIdManager extends XmppManagerBase {
@@ -86,9 +114,29 @@ class StableIdManager extends XmppManagerBase {
           .toList();
     }
 
-    return state.copyWith(
-      originId: originId,
-      stanzaIds: stanzaIds,
+    return state
+      ..extensions.set(
+        StableIdData(
+          originId,
+          stanzaIds,
+        ),
       );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<StableIdData>();
+    return data != null ? data.toXML() : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0380.dart

@@ -6,37 +6,17 @@ import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 
-enum ExplicitEncryptionType {
+enum ExplicitEncryptionType implements StanzaHandlerExtension {
   otr,
   legacyOpenPGP,
   openPGP,
   omemo,
   omemo1,
   omemo2,
-  unknown,
-}
+  unknown;
 
-String _explicitEncryptionTypeToString(ExplicitEncryptionType type) {
-  switch (type) {
-    case ExplicitEncryptionType.otr:
-      return emeOtr;
-    case ExplicitEncryptionType.legacyOpenPGP:
-      return emeLegacyOpenPGP;
-    case ExplicitEncryptionType.openPGP:
-      return emeOpenPGP;
-    case ExplicitEncryptionType.omemo:
-      return emeOmemo;
-    case ExplicitEncryptionType.omemo1:
-      return emeOmemo1;
-    case ExplicitEncryptionType.omemo2:
-      return emeOmemo2;
-    case ExplicitEncryptionType.unknown:
-      return '';
-  }
-}
-
-ExplicitEncryptionType _explicitEncryptionTypeFromString(String str) {
-  switch (str) {
+  factory ExplicitEncryptionType.fromNamespace(String namespace) {
+    switch (namespace) {
       case emeOtr:
         return ExplicitEncryptionType.otr;
       case emeLegacyOpenPGP:
@@ -52,18 +32,38 @@ ExplicitEncryptionType _explicitEncryptionTypeFromString(String str) {
       default:
         return ExplicitEncryptionType.unknown;
     }
-}
+  }
 
-/// Create an <encryption /> element with [type] indicating which type of encryption was
-/// used.
-XMLNode buildEmeElement(ExplicitEncryptionType type) {
+  String toNamespace() {
+    switch (this) {
+      case ExplicitEncryptionType.otr:
+        return emeOtr;
+      case ExplicitEncryptionType.legacyOpenPGP:
+        return emeLegacyOpenPGP;
+      case ExplicitEncryptionType.openPGP:
+        return emeOpenPGP;
+      case ExplicitEncryptionType.omemo:
+        return emeOmemo;
+      case ExplicitEncryptionType.omemo1:
+        return emeOmemo1;
+      case ExplicitEncryptionType.omemo2:
+        return emeOmemo2;
+      case ExplicitEncryptionType.unknown:
+        return '';
+    }
+  }
+
+  /// Create an <encryption /> element with an xmlns indicating what type of encryption was
+  /// used.
+  XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'encryption',
       xmlns: emeXmlns,
       attributes: <String, String>{
-      'namespace': _explicitEncryptionTypeToString(type),
+        'namespace': toNamespace(),
       },
     );
+  }
 }
 
 class EmeManager extends XmppManagerBase {
@@ -91,8 +91,9 @@ class EmeManager extends XmppManagerBase {
   ) async {
     final encryption = message.firstTag('encryption', xmlns: emeXmlns)!;
 
-    return state.copyWith(
-      encryptionType: _explicitEncryptionTypeFromString(
+    return state
+      ..extensions.set(
+        ExplicitEncryptionType.fromNamespace(
           encryption.attributes['namespace']! as String,
         ),
       );

packages/moxxmpp/lib/src/xeps/xep_0384/types.dart

@@ -1,6 +1,21 @@
+import 'package:omemo_dart/omemo_dart.dart';
+
 /// A simple wrapper class for defining elements that should not be encrypted.
 class DoNotEncrypt {
   const DoNotEncrypt(this.tag, this.xmlns);
+
+  /// The tag of the element.
   final String tag;
+
+  /// The xmlns attribute of the element.
   final String xmlns;
 }
+
+/// An encryption error caused by OMEMO.
+class OmemoEncryptionError {
+  const OmemoEncryptionError(this.jids, this.devices);
+
+  /// See omemo_dart's EncryptionResult for info on these fields.
+  final Map<String, OmemoException> jids;
+  final Map<RatchetMapKey, OmemoException> devices;
+}

packages/moxxmpp/lib/src/xeps/xep_0384/xep_0384.dart

@@ -16,6 +16,7 @@ import 'package:moxxmpp/src/xeps/xep_0030/types.dart';
 import 'package:moxxmpp/src/xeps/xep_0030/xep_0030.dart';
 import 'package:moxxmpp/src/xeps/xep_0060/errors.dart';
 import 'package:moxxmpp/src/xeps/xep_0060/xep_0060.dart';
+import 'package:moxxmpp/src/xeps/xep_0203.dart';
 import 'package:moxxmpp/src/xeps/xep_0280.dart';
 import 'package:moxxmpp/src/xeps/xep_0334.dart';
 import 'package:moxxmpp/src/xeps/xep_0380.dart';
@@ -276,7 +277,7 @@ abstract class BaseOmemoManager extends XmppManagerBase {
             // Add a storage hint in case this is a message
             // Taken from the example at
             // https://xmpp.org/extensions/xep-0384.html#message-structure-description.
-            MessageProcessingHint.store.toXml(),
+            MessageProcessingHint.store.toXML(),
           ],
         ),
         awaitable: false,
@@ -363,18 +364,17 @@ abstract class BaseOmemoManager extends XmppManagerBase {
     logger.finest('Encryption done');
 
     if (!result.isSuccess(2)) {
-      final other = Map<String, dynamic>.from(state.other);
-      other['encryption_error_jids'] = result.jidEncryptionErrors;
-      other['encryption_error_devices'] = result.deviceEncryptionErrors;
-      return state.copyWith(
-        other: other,
+      return state
+        ..cancel = true
         // If we have no device list for toJid, then the contact most likely does not
         // support OMEMO:2
-        cancelReason: result.jidEncryptionErrors[toJid.toString()]
+        ..cancelReason = result.jidEncryptionErrors[toJid.toString()]
                 is NoKeyMaterialAvailableException
             ? OmemoNotSupportedForContactException()
-            : UnknownOmemoError(),
-        cancel: true,
+            : UnknownOmemoError()
+        ..encryptionError = OmemoEncryptionError(
+          result.jidEncryptionErrors,
+          result.deviceEncryptionErrors,
         );
     }
 
@@ -389,19 +389,16 @@ abstract class BaseOmemoManager extends XmppManagerBase {
     if (stanza.tag == 'message') {
       children
         // Add EME data
-        ..add(buildEmeElement(ExplicitEncryptionType.omemo2))
+        ..add(ExplicitEncryptionType.omemo2.toXML())
         // Add a storage hint in case this is a message
         // Taken from the example at
         // https://xmpp.org/extensions/xep-0384.html#message-structure-description.
-        ..add(MessageProcessingHint.store.toXml());
+        ..add(MessageProcessingHint.store.toXML());
     }
 
-    return state.copyWith(
-      stanza: state.stanza.copyWith(
-        children: children,
-      ),
-      encrypted: true,
-    );
+    return state
+      ..stanza = state.stanza.copyWith(children: children)
+      ..encrypted = true;
   }
 
   /// This function is called whenever a message is to be encrypted. If it returns true,
@@ -444,17 +441,19 @@ abstract class BaseOmemoManager extends XmppManagerBase {
       OmemoIncomingStanza(
         fromJid.toString(),
         sid,
-        state.delayedDelivery?.timestamp.millisecondsSinceEpoch ??
+        state.extensions
+                .get<DelayedDeliveryData>()
+                ?.timestamp
+                .millisecondsSinceEpoch ??
             DateTime.now().millisecondsSinceEpoch,
         keys,
         payloadElement?.innerText(),
       ),
     );
 
-    final other = Map<String, dynamic>.from(state.other);
     var children = stanza.children;
     if (result.error != null) {
-      other['encryption_error'] = result.error;
+      state.encryptionError = result.error;
     } else {
       children = stanza.children
           .where(
@@ -471,11 +470,9 @@ abstract class BaseOmemoManager extends XmppManagerBase {
         envelope = XMLNode.fromString(result.payload!);
       } on XmlParserException catch (_) {
         logger.warning('Failed to parse envelope payload: ${result.payload!}');
-        other['encryption_error'] = InvalidEnvelopePayloadException();
-        return state.copyWith(
-          encrypted: true,
-          other: other,
-        );
+        return state
+          ..encrypted = true
+          ..encryptionError = InvalidEnvelopePayloadException();
       }
 
       final envelopeChildren = envelope.firstTag('content')?.children;
@@ -489,13 +486,13 @@ abstract class BaseOmemoManager extends XmppManagerBase {
       }
 
       if (!checkAffixElements(envelope, stanza.from!, ourJid)) {
-        other['encryption_error'] = InvalidAffixElementsException();
+        state.encryptionError = InvalidAffixElementsException();
       }
     }
 
-    return state.copyWith(
-      encrypted: true,
-      stanza: Stanza(
+    return state
+      ..encrypted = true
+      ..stanza = Stanza(
         to: stanza.to,
         from: stanza.from,
         id: stanza.id,
@@ -503,8 +500,6 @@ abstract class BaseOmemoManager extends XmppManagerBase {
         children: children,
         tag: stanza.tag,
         attributes: Map<String, String>.from(stanza.attributes),
-      ),
-      other: other,
       );
   }
 

packages/moxxmpp/lib/src/xeps/xep_0385.dart

@@ -7,7 +7,7 @@ import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/xeps/staging/extensible_file_thumbnails.dart';
 
-class StatelessMediaSharingData {
+class StatelessMediaSharingData implements StanzaHandlerExtension {
   const StatelessMediaSharingData({
     required this.mediaType,
     required this.size,
@@ -70,7 +70,9 @@ StatelessMediaSharingData parseSIMSElement(XMLNode node) {
   );
 }
 
+@Deprecated('Not maintained')
 class SIMSManager extends XmppManagerBase {
+  @Deprecated('Not maintained')
   SIMSManager() : super(simsManager);
 
   @override
@@ -98,7 +100,7 @@ class SIMSManager extends XmppManagerBase {
     final references = message.findTags('reference', xmlns: referenceXmlns);
     for (final ref in references) {
       final sims = ref.firstTag('media-sharing', xmlns: simsXmlns);
-      if (sims != null) return state.copyWith(sims: parseSIMSElement(sims));
+      if (sims != null) return state..extensions.set(parseSIMSElement(sims));
     }
 
     return state;

packages/moxxmpp/lib/src/xeps/xep_0424.dart

@@ -2,12 +2,19 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
+import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-class MessageRetractionData {
+class MessageRetractionData implements StanzaHandlerExtension {
   MessageRetractionData(this.id, this.fallback);
+
+  /// A potential fallback message to set the body to when retracting.
   final String? fallback;
+
+  /// The id of the message that is retracted.
   final String id;
 }
 
@@ -47,11 +54,55 @@ class MessageRetractionManager extends XmppManagerBase {
     final isFallbackBody =
         message.firstTag('fallback', xmlns: fallbackIndicationXmlns) != null;
 
-    return state.copyWith(
-      messageRetraction: MessageRetractionData(
+    return state
+      ..extensions.set(
+        MessageRetractionData(
           applyTo.attributes['id']! as String,
           isFallbackBody ? message.firstTag('body')?.innerText() : null,
         ),
       );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<MessageRetractionData>();
+    return data != null
+        ? [
+            XMLNode.xmlns(
+              tag: 'apply-to',
+              xmlns: fasteningXmlns,
+              attributes: <String, String>{
+                'id': data.id,
+              },
+              children: [
+                XMLNode.xmlns(
+                  tag: 'retract',
+                  xmlns: messageRetractionXmlns,
+                ),
+              ],
+            ),
+            if (data.fallback != null)
+              XMLNode(
+                tag: 'body',
+                text: data.fallback,
+              ),
+            if (data.fallback != null)
+              XMLNode.xmlns(
+                tag: 'fallback',
+                xmlns: fallbackIndicationXmlns,
+              ),
+          ]
+        : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0444.dart

@@ -2,16 +2,18 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-class MessageReactions {
-  const MessageReactions(this.messageId, this.emojis);
+class MessageReactionsData implements StanzaHandlerExtension {
+  const MessageReactionsData(this.messageId, this.emojis);
   final String messageId;
   final List<String> emojis;
 
-  XMLNode toXml() {
+  XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'reactions',
       xmlns: messageReactionsXmlns,
@@ -55,8 +57,9 @@ class MessageReactionsManager extends XmppManagerBase {
   ) async {
     final reactionsElement =
         message.firstTag('reactions', xmlns: messageReactionsXmlns)!;
-    return state.copyWith(
-      messageReactions: MessageReactions(
+    return state
+      ..extensions.set(
+        MessageReactionsData(
           reactionsElement.attributes['id']! as String,
           reactionsElement.children
               .where((c) => c.tag == 'reaction')
@@ -65,4 +68,25 @@ class MessageReactionsManager extends XmppManagerBase {
         ),
       );
   }
+
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<MessageReactionsData>();
+    return data != null
+        ? [
+            data.toXML(),
+          ]
+        : [];
+  }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0447.dart

@@ -3,9 +3,12 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
+import 'package:moxxmpp/src/xeps/xep_0066.dart';
 import 'package:moxxmpp/src/xeps/xep_0446.dart';
 import 'package:moxxmpp/src/xeps/xep_0448.dart';
 
@@ -70,8 +73,12 @@ List<StatelessFileSharingSource> processStatelessFileSharingSources(
   return sources;
 }
 
-class StatelessFileSharingData {
-  const StatelessFileSharingData(this.metadata, this.sources);
+class StatelessFileSharingData implements StanzaHandlerExtension {
+  const StatelessFileSharingData(
+    this.metadata,
+    this.sources, {
+    this.includeOOBFallback = false,
+  });
 
   /// Parse [node] as a StatelessFileSharingData element.
   factory StatelessFileSharingData.fromXML(XMLNode node) {
@@ -88,6 +95,10 @@ class StatelessFileSharingData {
   final FileMetadataData metadata;
   final List<StatelessFileSharingSource> sources;
 
+  /// Flag indicating whether an OOB fallback should be set. The value is only
+  /// relevant in the context of the messageSendingCallback.
+  final bool includeOOBFallback;
+
   XMLNode toXML() {
     return XMLNode.xmlns(
       tag: 'file-sharing',
@@ -122,23 +133,54 @@ class SFSManager extends XmppManagerBase {
           tagXmlns: sfsXmlns,
           callback: _onMessage,
           // Before the message handler
-          priority: -99,
+          priority: -98,
         )
       ];
 
   @override
   Future<bool> isSupported() async => true;
 
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<StatelessFileSharingData>();
+    if (data == null) {
+      return [];
+    }
+
+    // TODO(Unknown): Consider all sources?
+    final source = data.sources.first;
+    OOBData? oob;
+    if (source is StatelessFileSharingUrlSource && data.includeOOBFallback) {
+      // SFS recommends OOB as a fallback
+      oob = OOBData(source.url, null);
+    }
+
+    return [
+      data.toXML(),
+      if (oob != null) oob.toXML(),
+    ];
+  }
+
   Future<StanzaHandlerData> _onMessage(
     Stanza message,
     StanzaHandlerData state,
   ) async {
     final sfs = message.firstTag('file-sharing', xmlns: sfsXmlns)!;
 
-    return state.copyWith(
-      sfs: StatelessFileSharingData.fromXML(
-        sfs,
-      ),
+    return state
+      ..extensions.set(
+        StatelessFileSharingData.fromXML(sfs),
       );
   }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0449.dart

@@ -4,11 +4,13 @@ import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/rfcs/rfc_4790.dart';
 import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/types/result.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 import 'package:moxxmpp/src/xeps/xep_0060/errors.dart';
 import 'package:moxxmpp/src/xeps/xep_0060/xep_0060.dart';
 import 'package:moxxmpp/src/xeps/xep_0300.dart';
@@ -227,6 +229,19 @@ class StickerPack {
   }
 }
 
+class StickersData implements StanzaHandlerExtension {
+  const StickersData(this.stickerPackId, this.sticker, {this.addBody = true});
+
+  /// The id of the sticker pack the referenced sticker is from.
+  final String stickerPackId;
+
+  /// The metadata of the sticker.
+  final StatelessFileSharingData sticker;
+
+  /// If true, sets the sticker's metadata desc attribute as the message body.
+  final bool addBody;
+}
+
 class StickersManager extends XmppManagerBase {
   StickersManager() : super(stickersManager);
 
@@ -249,11 +264,37 @@ class StickersManager extends XmppManagerBase {
     StanzaHandlerData state,
   ) async {
     final sticker = stanza.firstTag('sticker', xmlns: stickersXmlns)!;
-    return state.copyWith(
-      stickerPackId: sticker.attributes['pack']! as String,
+    return state
+      ..extensions.set(
+        StickersData(
+          sticker.attributes['pack']! as String,
+          state.extensions.get<StatelessFileSharingData>()!,
+        ),
       );
   }
 
+  List<XMLNode> _messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<StickersData>();
+    return data != null
+        ? [
+            XMLNode.xmlns(
+              tag: 'sticker',
+              xmlns: stickersXmlns,
+              attributes: {
+                'pack': data.stickerPackId,
+              },
+            ),
+            data.sticker.toXML(),
+
+            // Add a body
+            if (data.addBody && data.sticker.metadata.desc != null)
+              MessageBodyData(data.sticker.metadata.desc).toXML(),
+          ]
+        : [];
+  }
+
   /// Publishes the StickerPack [pack] to the PubSub node of [jid]. If specified, then
   /// [accessModel] will be used as the PubSub node's access model.
   ///
@@ -319,4 +360,14 @@ class StickersManager extends XmppManagerBase {
 
     return Result(stickerPack);
   }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(_messageSendingCallback);
+  }
 }

packages/moxxmpp/lib/src/xeps/xep_0461.dart

@@ -1,24 +1,38 @@
-import 'package:meta/meta.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
 import 'package:moxxmpp/src/managers/handlers.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
+import 'package:moxxmpp/src/message.dart';
 import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stanza.dart';
+import 'package:moxxmpp/src/stringxml.dart';
+import 'package:moxxmpp/src/util/typed_map.dart';
 
-/// Data summarizing the XEP-0461 data.
-class ReplyData {
-  const ReplyData({
-    required this.id,
-    this.to,
+/// A reply to a message.
+class ReplyData implements StanzaHandlerExtension {
+  const ReplyData(
+    this.id, {
+    this.body,
+    this.jid,
     this.start,
     this.end,
   });
 
-  /// The bare JID to whom the reply applies to
-  final String? to;
+  ReplyData.fromQuoteData(
+    this.id,
+    QuoteData quote, {
+    this.jid,
+  })  : body = quote.body,
+        start = 0,
+        end = quote.fallbackLength;
 
-  /// The stanza ID of the message that is replied to
+  /// The JID of the entity whose message we are replying to.
+  final JID? jid;
+
+  /// The id of the message that is replied to. What id to use depends on what kind
+  /// of message you want to reply to.
   final String id;
 
   /// The start of the fallback body (inclusive)
@@ -27,18 +41,21 @@ class ReplyData {
   /// The end of the fallback body (exclusive)
   final int? end;
 
+  /// The body of the message.
+  final String? body;
+
   /// Applies the metadata to the received body [body] in order to remove the fallback.
   /// If either [ReplyData.start] or [ReplyData.end] are null, then body is returned as
   /// is.
-  String removeFallback(String body) {
+  String? get withoutFallback {
+    if (body == null) return null;
     if (start == null || end == null) return body;
 
-    return body.replaceRange(start!, end, '');
+    return body!.replaceRange(start!, end, '');
   }
 }
 
 /// Internal class describing how to build a message with a quote fallback body.
-@visibleForTesting
 class QuoteData {
   const QuoteData(this.body, this.fallbackLength);
 
@@ -85,13 +102,54 @@ class MessageRepliesManager extends XmppManagerBase {
   @override
   Future<bool> isSupported() async => true;
 
+  @visibleForTesting
+  List<XMLNode> messageSendingCallback(
+    TypedMap<StanzaHandlerExtension> extensions,
+  ) {
+    final data = extensions.get<ReplyData>();
+    return data != null
+        ? [
+            XMLNode.xmlns(
+              tag: 'reply',
+              xmlns: replyXmlns,
+              attributes: {
+                // The to attribute is optional
+                if (data.jid != null) 'to': data.jid!.toString(),
+
+                'id': data.id,
+              },
+            ),
+            if (data.body != null)
+              XMLNode(
+                tag: 'body',
+                text: data.body,
+              ),
+            if (data.body != null)
+              XMLNode.xmlns(
+                tag: 'fallback',
+                xmlns: fallbackXmlns,
+                attributes: {'for': replyXmlns},
+                children: [
+                  XMLNode(
+                    tag: 'body',
+                    attributes: {
+                      'start': data.start!.toString(),
+                      'end': data.end!.toString(),
+                    },
+                  ),
+                ],
+              ),
+          ]
+        : [];
+  }
+
   Future<StanzaHandlerData> _onMessage(
     Stanza stanza,
     StanzaHandlerData state,
   ) async {
     final reply = stanza.firstTag('reply', xmlns: replyXmlns)!;
-    final id = reply.attributes['id']! as String;
     final to = reply.attributes['to'] as String?;
+    final jid = to != null ? JID.fromString(to) : null;
     int? start;
     int? end;
 
@@ -103,13 +161,25 @@ class MessageRepliesManager extends XmppManagerBase {
       end = int.parse(body.attributes['end']! as String);
     }
 
-    return state.copyWith(
-      reply: ReplyData(
-        id: id,
-        to: to,
+    return state
+      ..extensions.set(
+        ReplyData(
+          reply.attributes['id']! as String,
+          jid: jid,
           start: start,
           end: end,
+          body: stanza.firstTag('body')?.innerText(),
         ),
       );
   }
+
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+
+    // Register the sending callback
+    getAttributes()
+        .getManagerById<MessageManager>(messageManager)
+        ?.registerMessageSendingCallback(messageSendingCallback);
+  }
 }

packages/moxxmpp/pubspec.yaml

@@ -1,6 +1,6 @@
 name: moxxmpp
 description: A pure-Dart XMPP library
-version: 0.3.2
+version: 0.4.0
 homepage: https://codeberg.org/moxxy/moxxmpp
 publish_to: https://git.polynom.me/api/packages/Moxxy/pub
 

packages/moxxmpp/test/helpers/manager.dart

@@ -1,13 +1,14 @@
 import 'dart:async';
 import 'package:moxxmpp/src/connection.dart';
 import 'package:moxxmpp/src/connectivity.dart';
+import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/handlers/client.dart';
 import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/attributes.dart';
 import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/reconnect.dart';
 import 'package:moxxmpp/src/settings.dart';
-import 'package:moxxmpp/src/socket.dart';
+import 'package:moxxmpp/src/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 
 import '../helpers/xmpp.dart';
@@ -15,15 +16,15 @@ import '../helpers/xmpp.dart';
 /// This class allows registering managers for easier testing.
 class TestingManagerHolder {
   TestingManagerHolder({
-    BaseSocketWrapper? socket,
-  }) : _socket = socket ?? StubTCPSocket([]);
+    StubTCPSocket? stubSocket,
+  }) : socket = stubSocket ?? StubTCPSocket([]);
 
-  final BaseSocketWrapper _socket;
+  final StubTCPSocket socket;
 
   final Map<String, XmppManagerBase> _managers = {};
 
-  // The amount of stanzas sent
-  int sentStanzas = 0;
+  /// A list of events that were triggered.
+  final List<XmppEvent> sentEvents = List.empty(growable: true);
 
   static final JID jid = JID.fromString('testuser@example.org/abc123');
   static final ConnectionSettings settings = ConnectionSettings(
@@ -31,22 +32,17 @@ class TestingManagerHolder {
     password: 'abc123',
   );
 
-  Future<XMLNode> _sendStanza(
-    stanza, {
-    bool addId = true,
-    bool awaitable = true,
-    bool encrypted = false,
-    bool forceEncryption = false,
-  }) async {
-    sentStanzas++;
-    return XMLNode.fromString('<iq />');
+  Future<XMLNode?> _sendStanza(StanzaDetails details) async {
+    socket.write(details.stanza.toXml());
+    return null;
   }
 
   T? _getManagerById<T extends XmppManagerBase>(String id) {
     return _managers[id] as T?;
   }
 
-  Future<void> register(XmppManagerBase manager) async {
+  Future<void> register(List<XmppManagerBase> managers) async {
+    for (final manager in managers) {
       manager.register(
         XmppManagerAttributes(
           sendStanza: _sendStanza,
@@ -54,19 +50,22 @@ class TestingManagerHolder {
             TestingReconnectionPolicy(),
             AlwaysConnectedConnectivityManager(),
             ClientToServerNegotiator(),
-          _socket,
+            socket,
           ),
           getConnectionSettings: () => settings,
           sendNonza: (_) {},
-        sendEvent: (_) {},
-        getSocket: () => _socket,
+          sendEvent: sentEvents.add,
+          getSocket: () => socket,
           getNegotiatorById: getNegotiatorNullStub,
           getFullJID: () => jid,
           getManagerById: _getManagerById,
         ),
       );
-
-    await manager.postRegisterCallback();
       _managers[manager.id] = manager;
     }
+
+    for (final manager in managers) {
+      await manager.postRegisterCallback();
+    }
+  }
 }

packages/moxxmpp/test/stanzahandler_test.dart

@@ -16,8 +16,8 @@ void main() {
       callback: (stanza, _) async => StanzaHandlerData(
         true,
         false,
-        null,
         stanza,
+        TypedMap(),
       ),
     );
 
@@ -38,8 +38,8 @@ void main() {
       callback: (stanza, _) async => StanzaHandlerData(
         true,
         false,
-        null,
         stanza,
+        TypedMap(),
       ),
       tagXmlns: 'owo',
     );
@@ -59,8 +59,8 @@ void main() {
         return StanzaHandlerData(
           true,
           false,
-          null,
           stanza,
+          TypedMap(),
         );
       },
       stanzaTag: 'iq',
@@ -77,8 +77,8 @@ void main() {
       StanzaHandlerData(
         false,
         false,
-        null,
         stanza2,
+        TypedMap(),
       ),
     );
     expect(run, true);
@@ -89,8 +89,8 @@ void main() {
       callback: (stanza, _) async => StanzaHandlerData(
         true,
         false,
-        null,
         stanza,
+        TypedMap(),
       ),
       tagName: 'tag',
     );
@@ -107,8 +107,8 @@ void main() {
       callback: (stanza, _) async => StanzaHandlerData(
         true,
         false,
-        null,
         stanza,
+        TypedMap(),
       ),
       tagName: 'tag',
       stanzaTag: 'iq',
@@ -127,8 +127,8 @@ void main() {
       callback: (stanza, _) async => StanzaHandlerData(
         true,
         false,
-        null,
         stanza,
+        TypedMap(),
       ),
       xmlns: componentAcceptXmlns,
     );
@@ -147,8 +147,8 @@ void main() {
         callback: (stanza, _) async => StanzaHandlerData(
           true,
           false,
-          null,
           stanza,
+          TypedMap(),
         ),
         tagName: '1',
         priority: 100,
@@ -157,8 +157,8 @@ void main() {
         callback: (stanza, _) async => StanzaHandlerData(
           true,
           false,
-          null,
           stanza,
+          TypedMap(),
         ),
         tagName: '2',
       ),
@@ -166,8 +166,8 @@ void main() {
         callback: (stanza, _) async => StanzaHandlerData(
           true,
           false,
-          null,
           stanza,
+          TypedMap(),
         ),
         tagName: '3',
         priority: 50,

packages/moxxmpp/test/type_map_test.dart

@@ -0,0 +1,39 @@
+import 'package:moxxmpp/src/util/typed_map.dart';
+import 'package:test/test.dart';
+
+abstract class BaseType {}
+
+class TestType1 implements BaseType {
+  const TestType1(this.i);
+  final int i;
+}
+
+class TestType2 implements BaseType {
+  const TestType2(this.j);
+  final bool j;
+}
+
+void main() {
+  test('Test storing data in the type map', () {
+    // Set
+    final map = TypedMap<BaseType>()
+      ..set(const TestType1(1))
+      ..set(const TestType2(false));
+
+    // And access
+    expect(map.get<TestType1>()?.i, 1);
+    expect(map.get<TestType2>()?.j, false);
+  });
+
+  test('Test storing data in the type map using a list', () {
+    // Set
+    final map = TypedMap<BaseType>.fromList([
+      const TestType1(1),
+      const TestType2(false),
+    ]);
+
+    // And access
+    expect(map.get<TestType1>()?.i, 1);
+    expect(map.get<TestType2>()?.j, false);
+  });
+}

packages/moxxmpp/test/xeps/xep_0030_test.dart

@@ -120,8 +120,7 @@ void main() {
       final ecm = EntityCapabilitiesManager('');
       final dm = DiscoManager([]);
 
-      await tm.register(dm);
-      await tm.register(ecm);
+      await tm.register([dm, ecm]);
 
       // Inject a capability hash into the cache
       final aliceJid = JID.fromString('alice@example.org/abc123');
@@ -140,7 +139,7 @@ void main() {
       // Query Alice's device
       final result = await dm.discoInfoQuery(aliceJid);
       expect(result.isType<DiscoError>(), false);
-      expect(tm.sentStanzas, 0);
+      expect(tm.socket.getState(), 0);
     });
   });
 }

packages/moxxmpp/test/xeps/xep_0060_test.dart

@@ -55,8 +55,10 @@ void main() {
       () async {
     final manager = PubSubManager();
     final tm = TestingManagerHolder();
-    await tm.register(StubbedDiscoManager(false));
-    await tm.register(manager);
+    await tm.register([
+      StubbedDiscoManager(false),
+      manager,
+    ]);
 
     final result = await manager.preprocessPublishOptions(
       JID.fromString('pubsub.server.example.org'),
@@ -72,8 +74,10 @@ void main() {
       () async {
     final manager = PubSubManager();
     final tm = TestingManagerHolder();
-    await tm.register(StubbedDiscoManager(true));
-    await tm.register(manager);
+    await tm.register([
+      StubbedDiscoManager(true),
+      manager,
+    ]);
 
     final result = await manager.preprocessPublishOptions(
       JID.fromString('pubsub.server.example.org'),
@@ -168,7 +172,6 @@ void main() {
       PubSubManager(),
       DiscoManager([]),
       PresenceManager(),
-      MessageManager(),
       RosterManager(TestingRosterStateManager(null, [])),
     ]);
     await connection.registerFeatureNegotiators([

packages/moxxmpp/test/xeps/xep_0115_test.dart

@@ -319,13 +319,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(StubbedDiscoManager());
-      await tm.register(manager);
+      await tm.register([
+        StubbedDiscoManager(),
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -338,8 +337,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       expect(
@@ -352,13 +353,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(StubbedDiscoManager());
-      await tm.register(manager);
+      await tm.register([
+        StubbedDiscoManager(),
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -371,8 +371,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       expect(
@@ -385,15 +387,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(
+      await tm.register([
         StubbedDiscoManager()..multipleEqualIdentities = true,
-      );
-      await tm.register(manager);
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -406,8 +405,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       expect(
@@ -420,15 +421,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(
+      await tm.register([
         StubbedDiscoManager()..multipleEqualFeatures = true,
-      );
-      await tm.register(manager);
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -441,8 +439,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       expect(
@@ -455,15 +455,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(
+      await tm.register([
         StubbedDiscoManager()..multipleExtendedFormsWithSameType = true,
-      );
-      await tm.register(manager);
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -476,8 +473,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       expect(
@@ -490,15 +489,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(
+      await tm.register([
         StubbedDiscoManager()..invalidExtension1 = true,
-      );
-      await tm.register(manager);
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -511,8 +507,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       final cachedItem = await manager.getCachedDiscoInfoFromJid(aliceJid);
@@ -527,15 +525,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(
+      await tm.register([
         StubbedDiscoManager()..invalidExtension2 = true,
-      );
-      await tm.register(manager);
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -548,8 +543,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       final cachedItem = await manager.getCachedDiscoInfoFromJid(aliceJid);
@@ -564,15 +561,12 @@ void main() {
       final tm = TestingManagerHolder();
       final manager = EntityCapabilitiesManager('');
 
-      await tm.register(
+      await tm.register([
         StubbedDiscoManager()..invalidExtension3 = true,
-      );
-      await tm.register(manager);
+        manager,
+      ]);
 
-      await manager.onPresence(
-        PresenceReceivedEvent(
-          aliceJid,
-          Stanza.presence(
+      final stanza = Stanza.presence(
         from: aliceJid.toString(),
         children: [
           XMLNode.xmlns(
@@ -585,8 +579,10 @@ void main() {
             },
           ),
         ],
-          ),
-        ),
+      );
+      await manager.onPresence(
+        stanza,
+        StanzaHandlerData(false, false, stanza, TypedMap()),
       );
 
       expect(

packages/moxxmpp/test/xeps/xep_0198_test.dart

@@ -15,8 +15,8 @@ Future<void> runIncomingStanzaHandlers(
         StanzaHandlerData(
           false,
           false,
-          null,
           stanza,
+          TypedMap(),
         ),
       );
     }
@@ -34,8 +34,8 @@ Future<void> runOutgoingStanzaHandlers(
         StanzaHandlerData(
           false,
           false,
-          null,
           stanza,
+          TypedMap(),
         ),
       );
     }

packages/moxxmpp/test/xeps/xep_0334_test.dart

@@ -0,0 +1,147 @@
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:test/test.dart';
+
+import '../helpers/manager.dart';
+import '../helpers/xmpp.dart';
+
+void main() {
+  test('Test receiving a message processing hint', () async {
+    final fakeSocket = StubTCPSocket(
+      [
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+      <mechanism>PLAIN</mechanism>
+    </mechanisms>
+  </stream:features>''',
+        ),
+        StringExpectation(
+          "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>AHBvbHlub21kaXZpc2lvbgBhYWFh</auth>",
+          '<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl" />',
+        ),
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
+      <required/>
+    </bind>
+    <session xmlns="urn:ietf:params:xml:ns:xmpp-session">
+      <optional/>
+    </session>
+    <csi xmlns="urn:xmpp:csi:0"/>
+    <sm xmlns="urn:xmpp:sm:3"/>
+  </stream:features>
+''',
+        ),
+        StanzaExpectation(
+          '<iq xmlns="jabber:client" type="set" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/></iq>',
+          '<iq xmlns="jabber:client" type="result" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>polynomdivision@test.server/MU29eEZn</jid></bind></iq>',
+          ignoreId: true,
+        ),
+      ],
+    );
+    final conn = XmppConnection(
+      TestingReconnectionPolicy(),
+      AlwaysConnectedConnectivityManager(),
+      ClientToServerNegotiator(),
+      fakeSocket,
+    )..connectionSettings = ConnectionSettings(
+        jid: JID.fromString('polynomdivision@test.server'),
+        password: 'aaaa',
+      );
+    await conn.registerManagers([
+      MessageManager(),
+      MessageProcessingHintManager(),
+    ]);
+    await conn.registerFeatureNegotiators([
+      SaslPlainNegotiator(),
+      ResourceBindingNegotiator(),
+    ]);
+    await conn.connect(
+      shouldReconnect: false,
+      enableReconnectOnSuccess: false,
+      waitUntilLogin: true,
+    );
+
+    MessageEvent? messageEvent;
+    conn.asBroadcastStream().listen((event) {
+      if (event is MessageEvent) {
+        messageEvent = event;
+      }
+    });
+
+    // Send the fake message
+    fakeSocket.injectRawXml(
+      '''
+<message id="aaaaaaaaa" from="user@example.org" to="polynomdivision@test.server/abc123" type="chat">
+  <no-copy xmlns="urn:xmpp:hints"/>
+  <no-store xmlns="urn:xmpp:hints"/>
+</message>
+''',
+    );
+
+    await Future<void>.delayed(const Duration(seconds: 2));
+    expect(
+      messageEvent!.extensions
+          .get<MessageProcessingHintData>()!
+          .hints
+          .contains(MessageProcessingHint.noCopies),
+      true,
+    );
+    expect(
+      messageEvent!.extensions
+          .get<MessageProcessingHintData>()!
+          .hints
+          .contains(MessageProcessingHint.noStore),
+      true,
+    );
+  });
+
+  test('Test sending a message processing hint', () async {
+    final manager = MessageManager();
+    final holder = TestingManagerHolder(
+      stubSocket: StubTCPSocket([
+        StanzaExpectation(
+          '''
+<message to="user@example.org" type="chat">
+  <no-copy xmlns="urn:xmpp:hints"/>
+  <no-store xmlns="urn:xmpp:hints"/>
+</message>
+''',
+          '',
+        )
+      ]),
+    );
+
+    await holder.register([
+      manager,
+      MessageProcessingHintManager(),
+    ]);
+
+    await manager.sendMessage(
+      JID.fromString('user@example.org'),
+      TypedMap()
+        ..set(
+          const MessageProcessingHintData([
+            MessageProcessingHint.noCopies,
+            MessageProcessingHint.noStore,
+          ]),
+        ),
+    );
+  });
+}

packages/moxxmpp/test/xeps/xep_0447_test.dart

@@ -13,7 +13,7 @@ void main() {
       <size>3032449</size>
       <dimensions>4096x2160</dimensions>
       <hash xmlns='urn:xmpp:hashes:2' algo='sha3-256'>2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=</hash>
-      <hash xmlns='urn:xmpp:hashes:2' algo='id-blake2b256'>2AfMGH8O7UNPTvUVAM9aK13mpCY=</hash>
+      <hash xmlns='urn:xmpp:hashes:2' algo='blake2b-256'>2AfMGH8O7UNPTvUVAM9aK13mpCY=</hash>
       <desc>Photo from the summit.</desc>
       <thumbnail xmlns='urn:xmpp:thumbs:1' uri='cid:sha1+ffd7c8d28e9c5e82afea41f97108c6b4@bob.xmpp.org' media-type='image/png' width='128' height='96'/>
     </file>
@@ -28,11 +28,11 @@ void main() {
     );
 
     expect(
-      sfs.metadata.hashes['sha3-256'],
+      sfs.metadata.hashes[HashFunction.sha3_256],
       '2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=',
     );
     expect(
-      sfs.metadata.hashes['id-blake2b256'],
+      sfs.metadata.hashes[HashFunction.blake2b256],
       '2AfMGH8O7UNPTvUVAM9aK13mpCY=',
     );
   });

packages/moxxmpp/test/xeps/xep_0449_test.dart

@@ -1,7 +1,13 @@
 import 'package:moxxmpp/moxxmpp.dart';
 import 'package:test/test.dart';
 
+import '../helpers/logging.dart';
+import '../helpers/manager.dart';
+import '../helpers/xmpp.dart';
+
 void main() {
+  initLogger();
+
   test('Test parsing a large sticker pack', () {
     // Example sticker pack based on the "miho" sticker pack by Movim
     final rawPack = XMLNode.fromString('''
@@ -225,4 +231,186 @@ void main() {
 
     expect(pack.stickers.length, 16);
   });
+
+  test('Test sending a sticker', () async {
+    final manager = MessageManager();
+    final holder = TestingManagerHolder(
+      stubSocket: StubTCPSocket([
+        StanzaExpectation(
+          // Example taken from https://xmpp.org/extensions/xep-0449.html#send
+          // - Replaced <dimensions /> with <width /> and <height />
+          '''
+<message to="user@example.org" type="chat">
+  <sticker xmlns='urn:xmpp:stickers:0' pack='EpRv28DHHzFrE4zd+xaNpVb4' />
+  <file-sharing xmlns='urn:xmpp:sfs:0'>
+    <file xmlns='urn:xmpp:file:metadata:0'>
+      <media-type>image/png</media-type>
+      <desc>😘</desc>
+      <size>67016</size>
+      <width>512</width>
+      <height>512</height>
+      <hash xmlns='urn:xmpp:hashes:2' algo='sha-256'>gw+6xdCgOcvCYSKuQNrXH33lV9NMzuDf/s0huByCDsY=</hash>
+    </file>
+    <sources>
+      <url-data xmlns='http://jabber.org/protocol/url-data' target='https://download.montague.lit/51078299-d071-46e1-b6d3-3de4a8ab67d6/sticker_marsey_kiss.png' />
+    </sources>
+  </file-sharing>
+</message>
+''',
+          '',
+        ),
+      ]),
+    );
+    await holder.register([
+      manager,
+      StickersManager(),
+      SFSManager(),
+    ]);
+
+    await manager.sendMessage(
+      JID.fromString('user@example.org'),
+      TypedMap()
+        ..set(
+          StickersData(
+            'EpRv28DHHzFrE4zd+xaNpVb4',
+            StatelessFileSharingData(
+              const FileMetadataData(
+                mediaType: 'image/png',
+                desc: '😘',
+                size: 67016,
+                width: 512,
+                height: 512,
+                hashes: {
+                  HashFunction.sha256:
+                      'gw+6xdCgOcvCYSKuQNrXH33lV9NMzuDf/s0huByCDsY=',
+                },
+                thumbnails: [],
+              ),
+              [
+                StatelessFileSharingUrlSource(
+                  'https://download.montague.lit/51078299-d071-46e1-b6d3-3de4a8ab67d6/sticker_marsey_kiss.png',
+                ),
+              ],
+            ),
+          ),
+        ),
+    );
+    await Future<void>.delayed(const Duration(seconds: 1));
+
+    expect(holder.socket.getState(), 1);
+  });
+
+  test('Test receiving a sticker', () async {
+    final fakeSocket = StubTCPSocket(
+      [
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+      <mechanism>PLAIN</mechanism>
+    </mechanisms>
+  </stream:features>''',
+        ),
+        StringExpectation(
+          "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>AHBvbHlub21kaXZpc2lvbgBhYWFh</auth>",
+          '<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl" />',
+        ),
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
+      <required/>
+    </bind>
+    <session xmlns="urn:ietf:params:xml:ns:xmpp-session">
+      <optional/>
+    </session>
+    <csi xmlns="urn:xmpp:csi:0"/>
+    <sm xmlns="urn:xmpp:sm:3"/>
+  </stream:features>
+''',
+        ),
+        StanzaExpectation(
+          '<iq xmlns="jabber:client" type="set" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/></iq>',
+          '<iq xmlns="jabber:client" type="result" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>polynomdivision@test.server/MU29eEZn</jid></bind></iq>',
+          ignoreId: true,
+        ),
+      ],
+    );
+    final conn = XmppConnection(
+      TestingReconnectionPolicy(),
+      AlwaysConnectedConnectivityManager(),
+      ClientToServerNegotiator(),
+      fakeSocket,
+    )..connectionSettings = ConnectionSettings(
+        jid: JID.fromString('polynomdivision@test.server'),
+        password: 'aaaa',
+      );
+    await conn.registerManagers([
+      MessageManager(),
+      SFSManager(),
+      StickersManager(),
+    ]);
+    await conn.registerFeatureNegotiators([
+      SaslPlainNegotiator(),
+      ResourceBindingNegotiator(),
+    ]);
+    await conn.connect(
+      shouldReconnect: false,
+      enableReconnectOnSuccess: false,
+      waitUntilLogin: true,
+    );
+
+    MessageEvent? messageEvent;
+    conn.asBroadcastStream().listen((event) {
+      if (event is MessageEvent) {
+        messageEvent = event;
+      }
+    });
+
+    // Send the fake message
+    fakeSocket.injectRawXml(
+      '''
+<message id="aaaaaaaaa" from="user@example.org" to="polynomdivision@test.server/abc123" type="chat">
+  <sticker xmlns='urn:xmpp:stickers:0' pack='EpRv28DHHzFrE4zd+xaNpVb4' />
+  <file-sharing xmlns='urn:xmpp:sfs:0'>
+    <file xmlns='urn:xmpp:file:metadata:0'>
+      <media-type>image/png</media-type>
+      <desc>😘</desc>
+      <size>67016</size>
+      <width>512</width>
+      <height>512</height>
+      <hash xmlns='urn:xmpp:hashes:2' algo='sha-256'>gw+6xdCgOcvCYSKuQNrXH33lV9NMzuDf/s0huByCDsY=</hash>
+    </file>
+    <sources>
+      <url-data xmlns='http://jabber.org/protocol/url-data' target='https://download.montague.lit/51078299-d071-46e1-b6d3-3de4a8ab67d6/sticker_marsey_kiss.png' />
+    </sources>
+  </file-sharing>
+</message>
+''',
+    );
+
+    await Future<void>.delayed(const Duration(seconds: 2));
+    final sticker = messageEvent!.extensions.get<StickersData>()!;
+    final sfs = messageEvent!.extensions.get<StatelessFileSharingData>()!;
+    expect(sticker.stickerPackId, 'EpRv28DHHzFrE4zd+xaNpVb4');
+    expect(sfs.metadata.desc, '😘');
+    expect(
+      sfs.sources.first is StatelessFileSharingUrlSource,
+      true,
+    );
+  });
 }

packages/moxxmpp/test/xeps/xep_0461_test.dart

@@ -1,6 +1,8 @@
 import 'package:moxxmpp/moxxmpp.dart';
 import 'package:test/test.dart';
 
+import '../helpers/xmpp.dart';
+
 void main() {
   test('Test building a singleline quote', () {
     final quote = QuoteData.fromBodies('Hallo Welt', 'Hello Earth!');
@@ -20,28 +22,250 @@ void main() {
   });
 
   test('Applying a singleline quote', () {
-    const body = '> Hallo Welt\nHello right back!';
     const reply = ReplyData(
-      to: '',
-      id: '',
+      '',
       start: 0,
       end: 13,
+      body: '> Hallo Welt\nHello right back!',
     );
 
-    final bodyWithoutFallback = reply.removeFallback(body);
-    expect(bodyWithoutFallback, 'Hello right back!');
+    expect(reply.withoutFallback, 'Hello right back!');
   });
 
   test('Applying a multiline quote', () {
-    const body = "> Hallo Welt\n> How are you?\nI'm fine.\nThank you!";
     const reply = ReplyData(
-      to: '',
-      id: '',
+      '',
       start: 0,
       end: 28,
+      body: "> Hallo Welt\n> How are you?\nI'm fine.\nThank you!",
     );
 
-    final bodyWithoutFallback = reply.removeFallback(body);
-    expect(bodyWithoutFallback, "I'm fine.\nThank you!");
+    expect(reply.withoutFallback, "I'm fine.\nThank you!");
+  });
+
+  test('Test calling the message sending callback', () {
+    final result = MessageRepliesManager().messageSendingCallback(
+      TypedMap()
+        ..set(
+          ReplyData.fromQuoteData(
+            'some-random-id',
+            QuoteData.fromBodies(
+              'Hello world',
+              'How are you doing?',
+            ),
+            jid: JID.fromString('quoted-user@example.org'),
+          ),
+        ),
+    );
+
+    final reply = result.firstWhere((e) => e.tag == 'reply');
+    final body = result.firstWhere((e) => e.tag == 'body');
+    final fallback = result.firstWhere((e) => e.tag == 'fallback');
+
+    expect(reply.attributes['to'], 'quoted-user@example.org');
+    expect(body.innerText(), '> Hello world\nHow are you doing?');
+    expect(fallback.children.first.attributes['start'], '0');
+    expect(fallback.children.first.attributes['end'], '14');
+  });
+
+  test('Test parsing a reply without fallback', () async {
+    final fakeSocket = StubTCPSocket(
+      [
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+      <mechanism>PLAIN</mechanism>
+    </mechanisms>
+  </stream:features>''',
+        ),
+        StringExpectation(
+          "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>AHBvbHlub21kaXZpc2lvbgBhYWFh</auth>",
+          '<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl" />',
+        ),
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
+      <required/>
+    </bind>
+    <session xmlns="urn:ietf:params:xml:ns:xmpp-session">
+      <optional/>
+    </session>
+    <csi xmlns="urn:xmpp:csi:0"/>
+    <sm xmlns="urn:xmpp:sm:3"/>
+  </stream:features>
+''',
+        ),
+        StanzaExpectation(
+          '<iq xmlns="jabber:client" type="set" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/></iq>',
+          '<iq xmlns="jabber:client" type="result" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>polynomdivision@test.server/MU29eEZn</jid></bind></iq>',
+          ignoreId: true,
+        ),
+      ],
+    );
+    final conn = XmppConnection(
+      TestingReconnectionPolicy(),
+      AlwaysConnectedConnectivityManager(),
+      ClientToServerNegotiator(),
+      fakeSocket,
+    )..connectionSettings = ConnectionSettings(
+        jid: JID.fromString('polynomdivision@test.server'),
+        password: 'aaaa',
+      );
+    await conn.registerManagers([
+      MessageManager(),
+      MessageRepliesManager(),
+    ]);
+    await conn.registerFeatureNegotiators([
+      SaslPlainNegotiator(),
+      ResourceBindingNegotiator(),
+    ]);
+    await conn.connect(
+      shouldReconnect: false,
+      enableReconnectOnSuccess: false,
+      waitUntilLogin: true,
+    );
+
+    MessageEvent? messageEvent;
+    conn.asBroadcastStream().listen((event) {
+      if (event is MessageEvent) {
+        messageEvent = event;
+      }
+    });
+
+    // Send the fake message
+    fakeSocket.injectRawXml(
+      '''
+<message id="aaaaaaaaa" from="user@example.org" to="polynomdivision@test.server/abc123" type="chat">
+  <body>Great idea!</body>
+  <reply to='anna@example.com/tablet' id='message-id1' xmlns='urn:xmpp:reply:0' />
+</message>
+''',
+    );
+
+    await Future<void>.delayed(const Duration(seconds: 2));
+    final reply = messageEvent!.extensions.get<ReplyData>()!;
+    expect(reply.withoutFallback, 'Great idea!');
+    expect(reply.id, 'message-id1');
+    expect(reply.jid, JID.fromString('anna@example.com/tablet'));
+    expect(reply.start, null);
+    expect(reply.end, null);
+  });
+
+  test('Test parsing a reply with a fallback', () async {
+    final fakeSocket = StubTCPSocket(
+      [
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+      <mechanism>PLAIN</mechanism>
+    </mechanisms>
+  </stream:features>''',
+        ),
+        StringExpectation(
+          "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>AHBvbHlub21kaXZpc2lvbgBhYWFh</auth>",
+          '<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl" />',
+        ),
+        StringExpectation(
+          "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='test.server' from='polynomdivision@test.server' xml:lang='en'>",
+          '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
+      <required/>
+    </bind>
+    <session xmlns="urn:ietf:params:xml:ns:xmpp-session">
+      <optional/>
+    </session>
+    <csi xmlns="urn:xmpp:csi:0"/>
+    <sm xmlns="urn:xmpp:sm:3"/>
+  </stream:features>
+''',
+        ),
+        StanzaExpectation(
+          '<iq xmlns="jabber:client" type="set" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/></iq>',
+          '<iq xmlns="jabber:client" type="result" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>polynomdivision@test.server/MU29eEZn</jid></bind></iq>',
+          ignoreId: true,
+        ),
+      ],
+    );
+    final conn = XmppConnection(
+      TestingReconnectionPolicy(),
+      AlwaysConnectedConnectivityManager(),
+      ClientToServerNegotiator(),
+      fakeSocket,
+    )..connectionSettings = ConnectionSettings(
+        jid: JID.fromString('polynomdivision@test.server'),
+        password: 'aaaa',
+      );
+    await conn.registerManagers([
+      MessageManager(),
+      MessageRepliesManager(),
+    ]);
+    await conn.registerFeatureNegotiators([
+      SaslPlainNegotiator(),
+      ResourceBindingNegotiator(),
+    ]);
+    await conn.connect(
+      shouldReconnect: false,
+      enableReconnectOnSuccess: false,
+      waitUntilLogin: true,
+    );
+
+    MessageEvent? messageEvent;
+    conn.asBroadcastStream().listen((event) {
+      if (event is MessageEvent) {
+        messageEvent = event;
+      }
+    });
+
+    // Send the fake message
+    fakeSocket.injectRawXml(
+      '''
+<message id="aaaaaaaaa" from="user@example.org" to="polynomdivision@test.server/abc123" type="chat">
+  <body>> Anna wrote:\n> We should bake a cake\nGreat idea!</body>
+  <reply to='anna@example.com/laptop' id='message-id1' xmlns='urn:xmpp:reply:0' />
+  <fallback xmlns='urn:xmpp:feature-fallback:0' for='urn:xmpp:reply:0'>
+    <body start="0" end="38" />
+  </fallback>
+</message>
+''',
+    );
+
+    await Future<void>.delayed(const Duration(seconds: 2));
+    final reply = messageEvent!.extensions.get<ReplyData>()!;
+    expect(reply.withoutFallback, 'Great idea!');
+    expect(reply.id, 'message-id1');
+    expect(reply.jid, JID.fromString('anna@example.com/laptop'));
+    expect(reply.start, 0);
+    expect(reply.end, 38);
   });
 }

packages/moxxmpp/test/xmpp_test.dart

@@ -78,8 +78,8 @@ Future<bool> testRosterManager(
         StanzaHandlerData(
           false,
           false,
-          null,
           stanza,
+          TypedMap(),
         ),
       );
     }
@@ -335,8 +335,8 @@ void main() {
             StanzaHandlerData(
               false,
               false,
-              null,
               maliciousStanza,
+              TypedMap(),
             ),
           );
         }
@@ -793,4 +793,20 @@ void main() {
     expect(fakeSocket.getState(), 9);
     expect(await stanzaFuture != null, true);
   });
+
+  test('Test subscription pre-approval parsing', () async {
+    final rawFeatures = XMLNode.fromString(
+      '''
+<top-level>
+  <test-feature-1 xmlns="invalid:urn:features:1" />
+  <test-feature-2 xmlns="invalid:urn:features:2" />
+  <test-feature-3 xmlns="invalid:urn:features:3" />
+  <test-feature-4 xmlns="invalid:urn:features:4" />
+  <sub xmlns='urn:xmpp:features:pre-approval' />
+</top-level>
+      ''',
+    );
+
+    expect(PresenceNegotiator().matchesFeature(rawFeatures.children), true);
+  });
 }