feat: Add DOAP

Fixes #11.

packages/moxxmpp/lib/moxxmpp.dart

@@ -1,6 +1,7 @@
 library moxxmpp;
 
 export 'package:moxxmpp/src/connection.dart';
+export 'package:moxxmpp/src/connectivity.dart';
 export 'package:moxxmpp/src/errors.dart';
 export 'package:moxxmpp/src/events.dart';
 export 'package:moxxmpp/src/iq.dart';

packages/moxxmpp/lib/src/connection.dart

@@ -4,6 +4,7 @@ import 'package:meta/meta.dart';
 import 'package:moxlib/moxlib.dart';
 import 'package:moxxmpp/src/awaiter.dart';
 import 'package:moxxmpp/src/buffer.dart';
+import 'package:moxxmpp/src/connectivity.dart';
 import 'package:moxxmpp/src/errors.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/iq.dart';
@@ -94,22 +95,24 @@ class XmppConnectionResult {
 class XmppConnection {
   XmppConnection(
     ReconnectionPolicy reconnectionPolicy,
+    ConnectivityManager connectivityManager,
     this._socket,
     {
       this.connectionPingDuration = const Duration(minutes: 3),
       this.connectingTimeout = const Duration(minutes: 2),
     }
-  ) : _reconnectionPolicy = reconnectionPolicy {
+  ) : _reconnectionPolicy = reconnectionPolicy,
-      // Allow the reconnection policy to perform reconnections by itself
+      _connectivityManager = connectivityManager {
-      _reconnectionPolicy.register(
+    // Allow the reconnection policy to perform reconnections by itself
-        _attemptReconnection,
+    _reconnectionPolicy.register(
-        _onNetworkConnectionLost,
+      _attemptReconnection,
-      );
+      _onNetworkConnectionLost,
+    );
 
-      _socketStream = _socket.getDataStream();
+    _socketStream = _socket.getDataStream();
-      // TODO(Unknown): Handle on done
+    // TODO(Unknown): Handle on done
-      _socketStream.transform(_streamBuffer).forEach(handleXmlStream);
+    _socketStream.transform(_streamBuffer).forEach(handleXmlStream);
-      _socket.getEventStream().listen(_handleSocketEvent);
+    _socket.getEventStream().listen(_handleSocketEvent);
   }
 
 
@@ -122,13 +125,16 @@ class XmppConnection {
   /// The data stream of the socket
   late final Stream<String> _socketStream;
 
-
   /// Connection settings
   late ConnectionSettings _connectionSettings;
 
   /// A policy on how to reconnect 
   final ReconnectionPolicy _reconnectionPolicy;
 
+  /// The class responsible for preventing errors on initial connection due
+  /// to no network.
+  final ConnectivityManager _connectivityManager;
+
   /// A helper for handling await semantics with stanzas
   final StanzaAwaiter _stanzaAwaiter = StanzaAwaiter();
   
@@ -217,63 +223,47 @@ class XmppConnection {
   /// none can be found.
   T? getNegotiatorById<T extends XmppFeatureNegotiatorBase>(String id) => _featureNegotiators[id] as T?;
   
-  /// Registers an [XmppManagerBase] sub-class as a manager on this connection.
+  /// Registers a list of [XmppManagerBase] sub-classes as managers on this connection.
-  /// [sortHandlers] should NOT be touched. It specified if the handler priorities
+  Future<void> registerManagers(List<XmppManagerBase> managers) async {
-  /// should be set up. The only time this should be false is when called via
-  /// [registerManagers].
-  void registerManager(XmppManagerBase manager, { bool sortHandlers = true }) {
-    _log.finest('Registering ${manager.getId()}');
-    manager.register(
-      XmppManagerAttributes(
-        sendStanza: sendStanza,
-        sendNonza: sendRawXML,
-        sendEvent: _sendEvent,
-        getConnectionSettings: () => _connectionSettings,
-        getManagerById: getManagerById,
-        isFeatureSupported: _serverFeatures.contains,
-        getFullJID: () => _connectionSettings.jid.withResource(_resource),
-        getSocket: () => _socket,
-        getConnection: () => this,
-        getNegotiatorById: getNegotiatorById,
-      ),
-    );
-
-    final id = manager.getId();
-    _xmppManagers[id] = manager;
-
-    if (id == discoManager) {
-      // NOTE: It is intentional that we do not exclude the [DiscoManager] from this
-      //       loop. It may also register features.
-      for (final registeredManager in _xmppManagers.values) {
-        (manager as DiscoManager).addDiscoFeatures(registeredManager.getDiscoFeatures());
-      }
-    } else if (_xmppManagers.containsKey(discoManager)) {
-      (_xmppManagers[discoManager]! as DiscoManager).addDiscoFeatures(manager.getDiscoFeatures());
-    }
-
-    _incomingStanzaHandlers.addAll(manager.getIncomingStanzaHandlers());
-    _incomingPreStanzaHandlers.addAll(manager.getIncomingPreStanzaHandlers());
-    _outgoingPreStanzaHandlers.addAll(manager.getOutgoingPreStanzaHandlers());
-    _outgoingPostStanzaHandlers.addAll(manager.getOutgoingPostStanzaHandlers());
-    
-    if (sortHandlers) {
-      _incomingStanzaHandlers.sort(stanzaHandlerSortComparator);
-      _incomingPreStanzaHandlers.sort(stanzaHandlerSortComparator);
-      _outgoingPreStanzaHandlers.sort(stanzaHandlerSortComparator);
-      _outgoingPostStanzaHandlers.sort(stanzaHandlerSortComparator);
-    }
-  }
-
-  /// Like [registerManager], but for a list of managers.
-  void registerManagers(List<XmppManagerBase> managers) {
     for (final manager in managers) {
-      registerManager(manager, sortHandlers: false);
+      _log.finest('Registering ${manager.getId()}');
+      manager.register(
+        XmppManagerAttributes(
+          sendStanza: sendStanza,
+          sendNonza: sendRawXML,
+          sendEvent: _sendEvent,
+          getConnectionSettings: () => _connectionSettings,
+          getManagerById: getManagerById,
+          isFeatureSupported: _serverFeatures.contains,
+          getFullJID: () => _connectionSettings.jid.withResource(_resource),
+          getSocket: () => _socket,
+          getConnection: () => this,
+          getNegotiatorById: getNegotiatorById,
+        ),
+      );
+
+      final id = manager.getId();
+      _xmppManagers[id] = manager;
+
+      _incomingStanzaHandlers.addAll(manager.getIncomingStanzaHandlers());
+      _incomingPreStanzaHandlers.addAll(manager.getIncomingPreStanzaHandlers());
+      _outgoingPreStanzaHandlers.addAll(manager.getOutgoingPreStanzaHandlers());
+      _outgoingPostStanzaHandlers.addAll(manager.getOutgoingPostStanzaHandlers());
     }
 
     // Sort them
     _incomingStanzaHandlers.sort(stanzaHandlerSortComparator);
+    _incomingPreStanzaHandlers.sort(stanzaHandlerSortComparator);
     _outgoingPreStanzaHandlers.sort(stanzaHandlerSortComparator);
     _outgoingPostStanzaHandlers.sort(stanzaHandlerSortComparator);
+
+    // Run the post register callbacks
+    for (final manager in _xmppManagers.values) {
+      if (!manager.initialized) {
+        _log.finest('Running post-registration callback for ${manager.getName()}');
+        await manager.postRegisterCallback();
+      }
+    }
   }
   
   /// Register a list of negotiator with the connection.
@@ -378,7 +368,7 @@ class XmppConnection {
     // Connect again
     // ignore: cascade_invocations
     _log.finest('Calling connect() from _attemptReconnection');
-    await connect();
+    await connect(waitForConnection: true);
   }
   
   /// Called when a stream ending error has occurred
@@ -401,7 +391,11 @@ class XmppConnection {
       return;
     }
 
-    await _setConnectionState(XmppConnectionState.error);
+    if (await _connectivityManager.hasConnection()) {
+      await _setConnectionState(XmppConnectionState.error);
+    } else {
+      await _setConnectionState(XmppConnectionState.notConnected);
+    }
     await _reconnectionPolicy.onFailure();
   }
 
@@ -832,7 +826,6 @@ class XmppConnection {
         if (_isMandatoryNegotiationDone(_streamFeatures) && !_isNegotiationPossible(_streamFeatures)) {
           _log.finest('Negotiations done!');
           _updateRoutingState(RoutingState.handleStanzas);
-          await _reconnectionPolicy.onSuccess();
           await _resetIsConnectionRunning();
           await _onNegotiationsDone();
         } else {
@@ -857,7 +850,6 @@ class XmppConnection {
         _log.finest('Negotiations done!');
 
         _updateRoutingState(RoutingState.handleStanzas);
-        await _reconnectionPolicy.onSuccess();
         await _resetIsConnectionRunning();
         await _onNegotiationsDone();
       } else {
@@ -875,7 +867,6 @@ class XmppConnection {
       _log.finest('Negotiator wants to skip the remaining negotiation... Negotiations (assumed) done!');
 
       _updateRoutingState(RoutingState.handleStanzas);
-      await _reconnectionPolicy.onSuccess();
       await _resetIsConnectionRunning();
       await _onNegotiationsDone();
       break;
@@ -987,7 +978,7 @@ class XmppConnection {
   }
 
   Future<void> _disconnect({required XmppConnectionState state, bool triggeredByUser = true}) async {
-    _reconnectionPolicy.setShouldReconnect(false);
+    await _reconnectionPolicy.setShouldReconnect(false);
 
     if (triggeredByUser) {
       getPresenceManager().sendUnavailablePresence();
@@ -1018,17 +1009,21 @@ class XmppConnection {
   
   /// Like [connect] but the Future resolves when the resource binding is either done or
   /// SASL has failed.
-  Future<XmppConnectionResult> connectAwaitable({ String? lastResource }) async {
+  Future<XmppConnectionResult> connectAwaitable({ String? lastResource, bool waitForConnection = false }) async {
     _runPreConnectionAssertions();
     await _resetIsConnectionRunning();
     _connectionCompleter = Completer();
     _log.finest('Calling connect() from connectAwaitable');
-    await connect(lastResource: lastResource);
+    await connect(
+      lastResource: lastResource,
+      waitForConnection: waitForConnection,
+      shouldReconnect: false,
+    );
     return _connectionCompleter!.future;
   }
  
   /// Start the connection process using the provided connection settings.
-  Future<void> connect({ String? lastResource }) async {
+  Future<void> connect({ String? lastResource, bool waitForConnection = false, bool shouldReconnect = true }) async {
     if (_connectionState != XmppConnectionState.notConnected && _connectionState != XmppConnectionState.error) {
       _log.fine('Cancelling this connection attempt as one appears to be already running.');
       return;
@@ -1036,15 +1031,25 @@ class XmppConnection {
     
     _runPreConnectionAssertions();
     await _resetIsConnectionRunning();
-    _reconnectionPolicy.setShouldReconnect(true);
     
     if (lastResource != null) {
       setResource(lastResource);
     }
 
+    if (shouldReconnect) {
+      await _reconnectionPolicy.setShouldReconnect(true);
+    }
+
     await _reconnectionPolicy.reset();
     await _sendEvent(ConnectingEvent());
 
+    // If requested, wait until we have a network connection
+    if (waitForConnection) {
+      _log.info('Waiting for okay from connectivityManager');
+      await _connectivityManager.waitForConnection();
+      _log.info('Got okay from connectivityManager');
+    }
+    
     final smManager = getStreamManagementManager();
     String? host;
     int? port;

packages/moxxmpp/lib/src/connectivity.dart

@@ -0,0 +1,18 @@
+/// This manager class is responsible to tell the moxxmpp XmppConnection
+/// when a connection can be established or not, regarding the network availability.
+abstract class ConnectivityManager {
+  /// Returns true if a network connection is available. If not, returns false.
+  Future<bool> hasConnection();
+
+  /// Returns a future that resolves once we have a network connection.
+  Future<void> waitForConnection();
+}
+
+/// An implementation of [ConnectivityManager] that is always connected.
+class AlwaysConnectedConnectivityManager extends ConnectivityManager {
+  @override
+  Future<bool> hasConnection() async => true;
+
+  @override
+  Future<void> waitForConnection() async {}
+}

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

@@ -1,14 +1,21 @@
 import 'package:logging/logging.dart';
+import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/managers/attributes.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/stringxml.dart';
+import 'package:moxxmpp/src/xeps/xep_0030/types.dart';
+import 'package:moxxmpp/src/xeps/xep_0030/xep_0030.dart';
 
 abstract class XmppManagerBase {
   late final XmppManagerAttributes _managerAttributes;
   late final Logger _log;
 
+  /// Flag indicating that the post registration callback has been called once.
+  bool initialized = false;
+  
   /// Registers the callbacks from XmppConnection with the manager
   void register(XmppManagerAttributes attributes) {
     _managerAttributes = attributes;
@@ -49,6 +56,9 @@ abstract class XmppManagerBase {
   /// Return a list of features that should be included in a disco response.
   List<String> getDiscoFeatures() => [];
 
+  /// Return a list of identities that should be included in a disco response.
+  List<Identity> getDiscoIdentities() => [];
+  
   /// Return the Id (akin to xmlns) of this manager.
   String getId();
 
@@ -64,6 +74,24 @@ abstract class XmppManagerBase {
   /// Returns true if the XEP is supported on the server. If not, returns false
   Future<bool> isSupported();
 
+  /// Called after the registration of all managers against the XmppConnection is done.
+  /// This method is only called once during the entire lifetime of it.
+  @mustCallSuper
+  Future<void> postRegisterCallback() async {
+    initialized = true;
+
+    final disco = getAttributes().getManagerById<DiscoManager>(discoManager);
+    if (disco != null) {
+      if (getDiscoFeatures().isNotEmpty) {
+        disco.addFeatures(getDiscoFeatures());
+      }
+
+      if (getDiscoIdentities().isNotEmpty) {
+        disco.addIdentities(getDiscoIdentities());
+      }
+    }
+  }
+  
   /// Runs all NonzaHandlers of this Manager which match the nonza. Resolves to true if
   /// the nonza has been handled by one of the handlers. Resolves to false otherwise.
   Future<bool> runNonzaHandlers(XMLNode nonza) async {

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

@@ -1,25 +1,25 @@
-const smManager = 'im.moxxmpp.streammangementmanager';
+const smManager = 'org.moxxmpp.streammangementmanager';
-const discoManager = 'im.moxxmpp.discomanager';
+const discoManager = 'org.moxxmpp.discomanager';
-const messageManager = 'im.moxxmpp.messagemanager';
+const messageManager = 'org.moxxmpp.messagemanager';
-const rosterManager = 'im.moxxmpp.rostermanager';
+const rosterManager = 'org.moxxmpp.rostermanager';
-const presenceManager = 'im.moxxmpp.presencemanager';
+const presenceManager = 'org.moxxmpp.presencemanager';
-const csiManager = 'im.moxxmpp.csimanager';
+const csiManager = 'org.moxxmpp.csimanager';
-const carbonsManager = 'im.moxxmpp.carbonsmanager';
+const carbonsManager = 'org.moxxmpp.carbonsmanager';
-const vcardManager = 'im.moxxmpp.vcardmanager';
+const vcardManager = 'org.moxxmpp.vcardmanager';
-const pubsubManager = 'im.moxxmpp.pubsubmanager';
+const pubsubManager = 'org.moxxmpp.pubsubmanager';
-const userAvatarManager = 'im.moxxmpp.useravatarmanager';
+const userAvatarManager = 'org.moxxmpp.useravatarmanager';
-const stableIdManager = 'im.moxxmpp.stableidmanager';
+const stableIdManager = 'org.moxxmpp.stableidmanager';
-const simsManager = 'im.moxxmpp.simsmanager';
+const simsManager = 'org.moxxmpp.simsmanager';
-const messageDeliveryReceiptManager = 'im.moxxmpp.messagedeliveryreceiptmanager';
+const messageDeliveryReceiptManager = 'org.moxxmpp.messagedeliveryreceiptmanager';
-const chatMarkerManager = 'im.moxxmpp.chatmarkermanager';
+const chatMarkerManager = 'org.moxxmpp.chatmarkermanager';
-const oobManager = 'im.moxxmpp.oobmanager';
+const oobManager = 'org.moxxmpp.oobmanager';
-const sfsManager = 'im.moxxmpp.sfsmanager';
+const sfsManager = 'org.moxxmpp.sfsmanager';
-const messageRepliesManager = 'im.moxxmpp.messagerepliesmanager';
+const messageRepliesManager = 'org.moxxmpp.messagerepliesmanager';
-const blockingManager = 'im.moxxmpp.blockingmanager';
+const blockingManager = 'org.moxxmpp.blockingmanager';
-const httpFileUploadManager = 'im.moxxmpp.httpfileuploadmanager';
+const httpFileUploadManager = 'org.moxxmpp.httpfileuploadmanager';
-const chatStateManager = 'im.moxxmpp.chatstatemanager';
+const chatStateManager = 'org.moxxmpp.chatstatemanager';
-const pingManager = 'im.moxxmpp.ping';
+const pingManager = 'org.moxxmpp.ping';
-const fileUploadNotificationManager = 'im.moxxmpp.fileuploadnotificationmanager';
+const fileUploadNotificationManager = 'org.moxxmpp.fileuploadnotificationmanager';
 const omemoManager = 'org.moxxmpp.omemomanager';
 const emeManager = 'org.moxxmpp.ememanager';
 const cryptographicHashManager = 'org.moxxmpp.cryptographichashmanager';
@@ -28,3 +28,4 @@ const messageRetractionManager = 'org.moxxmpp.messageretractionmanager';
 const lastMessageCorrectionManager = 'org.moxxmpp.lastmessagecorrectionmanager';
 const messageReactionsManager = 'org.moxxmpp.messagereactionsmanager';
 const stickersManager = 'org.moxxmpp.stickersmanager';
+const entityCapabilitiesManager = 'org.moxxmpp.entitycapabilities';

packages/moxxmpp/lib/src/presence.dart

@@ -8,17 +8,19 @@ 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/xep_0030/types.dart';
-import 'package:moxxmpp/src/xeps/xep_0030/xep_0030.dart';
-import 'package:moxxmpp/src/xeps/xep_0115.dart';
-import 'package:moxxmpp/src/xeps/xep_0414.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 mandatory manager that handles initial presence sending, sending of subscription
+/// request management requests and triggers events for incoming presence stanzas.
 class PresenceManager extends XmppManagerBase {
-  PresenceManager(this._capHashNode) : _capabilityHash = null, super();
+  PresenceManager() : super();
-  String? _capabilityHash;
-  final String _capHashNode;
 
-  String get capabilityHashNode => _capHashNode;
+  /// The list of pre-send callbacks.
+  final List<PresencePreSendCallback> _presenceCallbacks = List.empty(growable: true);
   
   @override
   String getId() => presenceManager;
@@ -40,6 +42,11 @@ class PresenceManager extends XmppManagerBase {
   @override
   Future<bool> isSupported() async => true;
 
+  /// Register the pre-send callback [callback].
+  void registerPreSendCallback(PresencePreSendCallback callback) {
+    _presenceCallbacks.add(callback);
+  }
+  
   Future<StanzaHandlerData> _onPresence(Stanza presence, StanzaHandlerData state) async {
     final attrs = getAttributes();
     switch (presence.type) {
@@ -63,43 +70,26 @@ class PresenceManager extends XmppManagerBase {
     return state;
   }
 
-  /// Returns the capability hash.
-  Future<String> getCapabilityHash() async {
-    final manager = getAttributes().getManagerById(discoManager)! as DiscoManager;
-    _capabilityHash ??= await calculateCapabilityHash(
-      DiscoInfo(
-        manager.getRegisteredDiscoFeatures(),
-        manager.getIdentities(),
-        [],
-        getAttributes().getFullJID(),
-      ),
-      getHashByName('sha-1')!,
-    );
-
-    return _capabilityHash!;
-  }
-  
   /// Sends the initial presence to enable receiving messages.
   Future<void> sendInitialPresence() async {
+    final children = List<XMLNode>.from([
+      XMLNode(
+        tag: 'show',
+        text: 'chat',
+      ),
+    ]);
+
+    for (final callback in _presenceCallbacks) {
+      children.addAll(
+        await callback(),
+      );
+    }
+
     final attrs = getAttributes();
     attrs.sendNonza(
       Stanza.presence(
         from: attrs.getFullJID().toString(),
-        children: [
+        children: children,
-          XMLNode(
-            tag: 'show',
-            text: 'chat',
-          ),
-          XMLNode.xmlns(
-            tag: 'c',
-            xmlns: capsXmlns,
-            attributes: {
-              'hash': 'sha-1',
-              'node': _capHashNode,
-              'ver': await getCapabilityHash()
-            },
-          )
-        ],
       ),
     );
   }

packages/moxxmpp/lib/src/reconnect.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:math';
 import 'package:logging/logging.dart';
 import 'package:meta/meta.dart';
+import 'package:moxxmpp/src/util/queue.dart';
 import 'package:synchronized/synchronized.dart';
 
 /// A callback function to be called when the connection to the server has been lost.
@@ -24,10 +25,16 @@ abstract class ReconnectionPolicy {
   bool _shouldAttemptReconnection = false;
 
   /// Indicate if a reconnection attempt is currently running.
-  bool _isReconnecting = false;
+  @protected
+  bool isReconnecting = false;
 
   /// And the corresponding lock
-  final Lock _isReconnectingLock = Lock();
+  @protected
+  final Lock lock = Lock();
+
+  /// The lock for accessing [_shouldAttemptReconnection]
+  @protected
+  final Lock shouldReconnectLock = Lock();
   
   /// Called by XmppConnection to register the policy.
   void register(PerformReconnectFunction performReconnect, ConnectionLostCallback triggerConnectionLost) {
@@ -48,96 +55,121 @@ abstract class ReconnectionPolicy {
   /// Caled by the XmppConnection when the reconnection was successful.
   Future<void> onSuccess();
 
-  bool get shouldReconnect => _shouldAttemptReconnection;
+  Future<bool> getShouldReconnect() async {
+    return shouldReconnectLock.synchronized(() => _shouldAttemptReconnection);
+  }
 
   /// Set whether a reconnection attempt should be made.
-  void setShouldReconnect(bool value) {
+  Future<void> setShouldReconnect(bool value) async {
-    _shouldAttemptReconnection = value;
+    return shouldReconnectLock.synchronized(() => _shouldAttemptReconnection = value);
   }
 
   /// Returns true if the manager is currently triggering a reconnection. If not, returns
   /// false.
   Future<bool> isReconnectionRunning() async {
-    return _isReconnectingLock.synchronized(() => _isReconnecting);
+    return lock.synchronized(() => isReconnecting);
   }
 
-  /// Set the _isReconnecting state to [value].
+  /// Set the isReconnecting state to [value].
   @protected
   Future<void> setIsReconnecting(bool value) async {
-    await _isReconnectingLock.synchronized(() async {
+    await lock.synchronized(() async {
-      _isReconnecting = value;
+      isReconnecting = value;
     });
   }
 
-  @protected
-  Future<bool> testAndSetIsReconnecting() async {
-    return _isReconnectingLock.synchronized(() {
-      if (_isReconnecting) {
-        return false;
-      } else {
-        _isReconnecting = true;
-        return true;
-      }
-    });
-  }
 }
 
 /// A simple reconnection strategy: Make the reconnection delays exponentially longer
 /// for every failed attempt.
 /// NOTE: This ReconnectionPolicy may be broken
-class ExponentialBackoffReconnectionPolicy extends ReconnectionPolicy {
+class RandomBackoffReconnectionPolicy extends ReconnectionPolicy {
-  ExponentialBackoffReconnectionPolicy(this._maxBackoffTime) : super();
+  RandomBackoffReconnectionPolicy(
+    this._minBackoffTime,
+    this._maxBackoffTime,
+  ) : assert(_minBackoffTime < _maxBackoffTime, '_minBackoffTime must be smaller than _maxBackoffTime'),
+      super();
 
-  /// The maximum time in seconds that a backoff step should be.
+  /// The maximum time in seconds that a backoff should be.
   final int _maxBackoffTime;
 
-  /// Amount of consecutive failed reconnections.
+  /// The minimum time in seconds that a backoff should be.
-  int _counter = 0;
+  final int _minBackoffTime;
 
   /// Backoff timer.
   Timer? _timer;
 
+  final Lock _timerLock = Lock();
+
   /// Logger.
-  final Logger _log = Logger('ExponentialBackoffReconnectionPolicy');
+  final Logger _log = Logger('RandomBackoffReconnectionPolicy');
+
+  /// Event queue
+  final AsyncQueue _eventQueue = AsyncQueue();
 
   /// Called when the backoff expired
   Future<void> _onTimerElapsed() async {
-    final isReconnecting = await isReconnectionRunning();
+    _log.fine('Timer elapsed. Waiting for lock');
-    if (shouldReconnect) {
+    await lock.synchronized(() async {
-      if (!isReconnecting) {
+      _log.fine('Lock aquired');
-        await setIsReconnecting(true);
+      if (!(await getShouldReconnect())) {
-        await performReconnect!();
+        _log.fine('Backoff timer expired but getShouldReconnect() returned false');
-      } else {
+        return;
-        // Should never happen.
-        _log.fine('Backoff timer expired but reconnection is running, so doing nothing.');
       }
-    }
+
+      if (isReconnecting) {
+        _log.fine('Backoff timer expired but a reconnection is running, so doing nothing.');
+        return;
+      }
+
+      _log.fine('Triggering reconnect');
+      isReconnecting = true;
+      await performReconnect!();
+    });
+
+    await _timerLock.synchronized(() {
+      _timer?.cancel();
+      _timer = null;
+    });
+  }
+
+  Future<void> _reset() async {
+    _log.finest('Resetting internal state');
+
+    await _timerLock.synchronized(() {
+      _timer?.cancel();
+      _timer = null;
+    });
+
+    await setIsReconnecting(false);
   }
   
   @override
   Future<void> reset() async {
-    _log.finest('Resetting internal state');
+    // ignore: unnecessary_lambdas
-    _counter = 0;
+    await _eventQueue.addJob(() => _reset());
-    await setIsReconnecting(false);
+  }
 
-    if (_timer != null) {
+  Future<void> _onFailure() async {
-      _timer!.cancel();
+    final shouldContinue = await _timerLock.synchronized(() {
-      _timer = null;
+      return _timer == null;
+    });
+    if (!shouldContinue) {
+      _log.finest('_onFailure: Not backing off since _timer is already running');
+      return;
     }
+
+    final seconds = Random().nextInt(_maxBackoffTime - _minBackoffTime) + _minBackoffTime;
+    _log.finest('Failure occured. Starting random backoff with ${seconds}s');
+    _timer?.cancel();
+
+    _timer = Timer(Duration(seconds: seconds), _onTimerElapsed);
   }
   
   @override
   Future<void> onFailure() async {
-    _log.finest('Failure occured. Starting exponential backoff');
+    // ignore: unnecessary_lambdas
-    _counter++;
+    await _eventQueue.addJob(() => _onFailure());
-
-    if (_timer != null) {
-      _timer!.cancel();
-    }
-
-    // Wait at max 80 seconds.
-    final seconds = min(min(pow(2, _counter).toInt(), 80), _maxBackoffTime);
-    _timer = Timer(Duration(seconds: seconds), _onTimerElapsed);
   }
 
   @override

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

@@ -0,0 +1,56 @@
+import 'dart:async';
+import 'dart:collection';
+import 'package:meta/meta.dart';
+import 'package:synchronized/synchronized.dart';
+
+/// A job to be submitted to an [AsyncQueue].
+typedef AsyncQueueJob = Future<void> Function();
+
+/// A (hopefully) async-safe queue that attempts to force
+/// in-order execution of its jobs.
+class AsyncQueue {
+  /// The lock for accessing [AsyncQueue._lock] and [AsyncQueue._running].
+  final Lock _lock = Lock();
+
+  /// The actual job queue.
+  final Queue<AsyncQueueJob> _queue = Queue<AsyncQueueJob>();
+  
+  /// Indicates whether we are currently executing a job.
+  bool _running = false;
+
+  @visibleForTesting
+  Queue<AsyncQueueJob> get queue => _queue;
+
+  @visibleForTesting
+  bool get isRunning => _running;
+  
+  /// Adds a job [job] to the queue.
+  Future<void> addJob(AsyncQueueJob job) async {
+    await _lock.synchronized(() {
+      _queue.add(job);
+
+      if (!_running && _queue.isNotEmpty) {
+        _running = true;
+        unawaited(_popJob());
+      }
+    });
+  }
+
+  Future<void> clear() async {
+    await _lock.synchronized(_queue.clear);
+  }
+  
+  Future<void> _popJob() async {
+    final job = _queue.removeFirst();
+    final future = job();
+    await future;
+
+    await _lock.synchronized(() {
+      if (_queue.isNotEmpty) {
+        unawaited(_popJob());
+      } else {
+        _running = false;
+      }
+    });
+  }
+}

packages/moxxmpp/lib/src/xeps/xep_0004.dart

@@ -3,7 +3,6 @@ import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 
 class DataFormOption {
-
   const DataFormOption({ required this.value, this.label });
   final String? label;
   final String value;
@@ -23,7 +22,6 @@ class DataFormOption {
 }
 
 class DataFormField {
-
   const DataFormField({
       required this.options,
       required this.values,
@@ -60,7 +58,6 @@ class DataFormField {
 }
 
 class DataForm {
-
   const DataForm({
       required this.type,
       required this.instructions,

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

@@ -6,20 +6,20 @@ import 'package:moxxmpp/src/stringxml.dart';
 
 Stanza buildDiscoInfoQueryStanza(String entity, String? node) {
   return Stanza.iq(to: entity, type: 'get', children: [
-      XMLNode.xmlns(
+    XMLNode.xmlns(
-        tag: 'query',
+      tag: 'query',
-        xmlns: discoInfoXmlns,
+      xmlns: discoInfoXmlns,
-        attributes: node != null ? { 'node': node } : {},
+      attributes: node != null ? { 'node': node } : {},
-      )
+    )
   ],);
 }
 
 Stanza buildDiscoItemsQueryStanza(String entity, { String? node }) {
   return Stanza.iq(to: entity, type: 'get', children: [
-      XMLNode.xmlns(
+    XMLNode.xmlns(
-        tag: 'query',
+      tag: 'query',
-        xmlns: discoItemsXmlns,
+      xmlns: discoItemsXmlns,
-        attributes: node != null ? { 'node': node } : {},
+      attributes: node != null ? { 'node': node } : {},
-      )
+    )
   ],);
 }

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

@@ -1,9 +1,10 @@
+import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/jid.dart';
+import 'package:moxxmpp/src/namespaces.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/xeps/xep_0004.dart';
 
 class Identity {
-
   const Identity({ required this.category, required this.type, this.name, this.lang });
   final String category;
   final String type;
@@ -23,24 +24,96 @@ class Identity {
   }
 }
 
+@immutable
 class DiscoInfo {
-
   const DiscoInfo(
     this.features,
     this.identities,
     this.extendedInfo,
+    this.node,
     this.jid,
   );
+
+  factory DiscoInfo.fromQuery(XMLNode query, JID jid) {
+    final features = List<String>.empty(growable: true);
+    final identities = List<Identity>.empty(growable: true);
+    final extendedInfo = List<DataForm>.empty(growable: true);
+
+    for (final element in query.children) {
+      if (element.tag == 'feature') {
+        features.add(element.attributes['var']! as String);
+      } else if (element.tag == 'identity') {
+        identities.add(
+          Identity(
+            category: element.attributes['category']! as String,
+            type: element.attributes['type']! as String,
+            name: element.attributes['name'] as String?,
+          ),
+        );
+      } else if (element.tag == 'x' && element.attributes['xmlns'] == dataFormsXmlns) {
+        extendedInfo.add(
+          parseDataForm(element),
+        );
+      }
+    }
+
+    return DiscoInfo(
+      features,
+      identities,
+      extendedInfo,
+      query.attributes['node'] as String?,
+      jid,
+    );
+  }
+
   final List<String> features;
   final List<Identity> identities;
   final List<DataForm> extendedInfo;
-  final JID jid;
+  final String? node;
+  final JID? jid;
+
+  XMLNode toXml() {
+    return XMLNode.xmlns(
+      tag: 'query',
+      xmlns: discoInfoXmlns,
+      attributes: node != null ?
+        <String, String>{ 'node': node!, } :
+        <String, String>{},
+      children: [
+        ...identities.map((identity) => identity.toXMLNode()),
+        ...features.map((feature) => XMLNode(
+          tag: 'feature',
+          attributes: { 'var': feature, },
+        ),),
+        
+        if (extendedInfo.isNotEmpty)
+          ...extendedInfo.map((ei) => ei.toXml()),
+      ],
+    );
+  }
 }
 
+@immutable
 class DiscoItem {
-
   const DiscoItem({ required this.jid, this.node, this.name });
   final String jid;
   final String? node;
   final String? name;
+
+  XMLNode toXml() {
+    final attributes = {
+      'jid': jid,
+    };
+    if (node != null) {
+      attributes['node'] = node!;
+    }
+    if (name != null) {
+      attributes['name'] = name!;
+    }
+
+    return XMLNode(
+      tag: 'node',
+      attributes: attributes,
+    );
+  }
 }

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

@@ -7,17 +7,21 @@ 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/stanza.dart';
 import 'package:moxxmpp/src/stringxml.dart';
 import 'package:moxxmpp/src/types/result.dart';
-import 'package:moxxmpp/src/xeps/xep_0004.dart';
 import 'package:moxxmpp/src/xeps/xep_0030/errors.dart';
 import 'package:moxxmpp/src/xeps/xep_0030/helpers.dart';
 import 'package:moxxmpp/src/xeps/xep_0030/types.dart';
 import 'package:moxxmpp/src/xeps/xep_0115.dart';
 import 'package:synchronized/synchronized.dart';
 
+/// Callback that is called when a disco#info requests is received on a given node.
+typedef DiscoInfoRequestCallback = Future<DiscoInfo> Function();
+
+/// Callback that is called when a disco#items requests is received on a given node.
+typedef DiscoItemsRequestCallback = Future<List<DiscoItem>> Function();
+
 @immutable
 class DiscoCacheKey {
   const DiscoCacheKey(this.jid, this.node);
@@ -33,32 +37,48 @@ class DiscoCacheKey {
   int get hashCode => jid.hashCode ^ node.hashCode;
 }
 
+/// This manager implements XEP-0030 by providing a way of performing disco#info and
+/// disco#items requests and answering those requests.
+/// A caching mechanism is also provided.
 class DiscoManager extends XmppManagerBase {
-  DiscoManager()
+  /// [identities] is a list of disco identities that should be added by default
-    : _features = List.empty(growable: true),
+  /// to a disco#info response.
-      _capHashCache = {},
+  DiscoManager(List<Identity> identities)
-      _capHashInfoCache = {},
+    : _identities = List<Identity>.from(identities),
-      _discoInfoCache = {},
-      _runningInfoQueries = {},
-      _cacheLock = Lock(),
       super();
+
   /// Our features
-  final List<String> _features;
+  final List<String> _features = List.empty(growable: true);
+
+  /// Disco identities that we advertise
+  final List<Identity> _identities;
   
   /// Map full JID to Capability hashes
-  final Map<String, CapabilityHashInfo> _capHashCache;
+  final Map<String, CapabilityHashInfo> _capHashCache = {};
 
   /// Map capability hash to the disco info
-  final Map<String, DiscoInfo> _capHashInfoCache;
+  final Map<String, DiscoInfo> _capHashInfoCache = {};
 
   /// Map full JID to Disco Info
-  final Map<DiscoCacheKey, DiscoInfo> _discoInfoCache;
+  final Map<DiscoCacheKey, DiscoInfo> _discoInfoCache = {};
 
   /// Mapping the full JID to a list of running requests
-  final Map<DiscoCacheKey, List<Completer<Result<DiscoError, DiscoInfo>>>> _runningInfoQueries;
+  final Map<DiscoCacheKey, List<Completer<Result<DiscoError, DiscoInfo>>>> _runningInfoQueries = {};
 
   /// Cache lock
-  final Lock _cacheLock;
+  final Lock _cacheLock = Lock();
+
+  /// disco#info callbacks: node -> Callback
+  final Map<String, DiscoInfoRequestCallback> _discoInfoCallbacks = {};
+
+  /// disco#items callbacks: node -> Callback
+  final Map<String, DiscoItemsRequestCallback> _discoItemsCallbacks = {};
+
+  /// The list of identities that are registered.
+  List<Identity> get identities => _identities;
+
+  /// The list of disco features that are registered.
+  List<String> get features => _features;
   
   @visibleForTesting
   bool hasInfoQueriesRunning() => _runningInfoQueries.isNotEmpty;
@@ -106,9 +126,19 @@ class DiscoManager extends XmppManagerBase {
     }
   }
 
+  /// Register a callback [callback] for a disco#info query on [node].
+  void registerInfoCallback(String node, DiscoInfoRequestCallback callback) {
+    _discoInfoCallbacks[node] = callback;
+  }
+
+  /// Register a callback [callback] for a disco#items query on [node].
+  void registerItemsCallback(String node, DiscoItemsRequestCallback callback) {
+    _discoItemsCallbacks[node] = callback;
+  }
+  
   /// Adds a list of features to the possible disco info response.
   /// This function only adds features that are not already present in the disco features.
-  void addDiscoFeatures(List<String> features) {
+  void addFeatures(List<String> features) {
     for (final feat in features) {
       if (!_features.contains(feat)) {
         _features.add(feat);
@@ -116,6 +146,16 @@ class DiscoManager extends XmppManagerBase {
     }
   }
 
+  /// Adds a list of identities to the possible disco info response.
+  /// This function only adds features that are not already present in the disco features.
+  void addIdentities(List<Identity> identities) {
+    for (final identity in identities) {
+      if (!_identities.contains(identity)) {
+        _identities.add(identity);
+      }
+    }
+  }
+  
   Future<void> _onPresence(JID from, Stanza presence) async {
     final c = presence.firstTag('c', xmlns: capsXmlns);
     if (c == null) return;
@@ -146,45 +186,33 @@ class DiscoManager extends XmppManagerBase {
     });
   }
   
-  /// Returns the list of disco features registered.
+  /// Returns the [DiscoInfo] object that would be used as the response to a disco#info
-  List<String> getRegisteredDiscoFeatures() => _features;
+  /// query against our bare JID with no node. The results node attribute is set
-  
+  /// to [node].
-  /// May be overriden. Specifies the identities which will be returned in a disco info response.
+  DiscoInfo getDiscoInfo(String? node) {
-  List<Identity> getIdentities() => const [ Identity(category: 'client', type: 'pc', name: 'moxxmpp', lang: 'en') ];
+    return DiscoInfo(
+      _features,
+      _identities,
+      const [],
+      node,
+      null,
+    );
+  }
   
   Future<StanzaHandlerData> _onDiscoInfoRequest(Stanza stanza, StanzaHandlerData state) async {
     if (stanza.type != 'get') return state;
 
-    final presence = getAttributes().getManagerById(presenceManager)! as PresenceManager;
     final query = stanza.firstTag('query', xmlns: discoInfoXmlns)!;
     final node = query.attributes['node'] as String?;
-    final capHash = await presence.getCapabilityHash();
-    final isCapabilityNode = node == '${presence.capabilityHashNode}#$capHash';
 
-    if (!isCapabilityNode && node != null) {
+    if (_discoInfoCallbacks.containsKey(node)) {
+      // We can now assume that node != null
+      final result = await _discoInfoCallbacks[node]!();
       await reply(
         state,
-        'error',
+        'result',
         [
-          XMLNode.xmlns(
+          result.toXml(),
-            tag: 'query',
-            xmlns: discoInfoXmlns,
-            attributes: <String, String>{
-              'node': node
-            },
-          ),
-          XMLNode(
-            tag: 'error',
-            attributes: <String, String>{
-              'type': 'cancel'
-            },
-            children: [
-              XMLNode.xmlns(
-                tag: 'not-allowed',
-                xmlns: fullStanzaXmlns,
-              )
-            ],
-          ),
         ],
       );
 
@@ -195,24 +223,7 @@ class DiscoManager extends XmppManagerBase {
       state,
       'result',
       [
-        XMLNode.xmlns(
+        getDiscoInfo(node).toXml(),
-          tag: 'query',
-          xmlns: discoInfoXmlns,
-          attributes: {
-            ...!isCapabilityNode ? {} : {
-              'node': '${presence.capabilityHashNode}#$capHash'
-            }
-          },
-          children: [
-            ...getIdentities().map((identity) => identity.toXMLNode()),
-            ..._features.map((feat) {
-              return XMLNode(
-                tag: 'feature',
-                attributes: <String, dynamic>{ 'var': feat },
-              );
-            }),
-          ],
-        ),
       ],
     );
 
@@ -223,30 +234,20 @@ class DiscoManager extends XmppManagerBase {
     if (stanza.type != 'get') return state;
 
     final query = stanza.firstTag('query', xmlns: discoItemsXmlns)!;
-    if (query.attributes['node'] != null) {
+    final node = query.attributes['node'] as String?;
-      // TODO(Unknown): Handle the node we specified for XEP-0115
+    if (_discoItemsCallbacks.containsKey(node)) {
+      final result = await _discoItemsCallbacks[node]!();
       await reply(
         state,
-        'error',
+        'result',
         [
           XMLNode.xmlns(
             tag: 'query',
             xmlns: discoItemsXmlns,
             attributes: <String, String>{
-              'node': query.attributes['node']! as String,
+              'node': node!,
             },
-          ),
+            children: result.map((item) => item.toXml()).toList(),
-          XMLNode(
-            tag: 'error',
-            attributes: <String, dynamic>{
-              'type': 'cancel'
-            },
-            children: [
-              XMLNode.xmlns(
-                tag: 'not-allowed',
-                xmlns: fullStanzaXmlns,
-              ),
-            ],
           ),
         ],
       );
@@ -254,18 +255,7 @@ class DiscoManager extends XmppManagerBase {
       return state.copyWith(done: true);
     }
 
-    await reply(
+    return state;
-      state,
-      'result',
-      [
-        XMLNode.xmlns(
-          tag: 'query',
-          xmlns: discoItemsXmlns,
-        ),
-      ],
-    );
-
-    return state.copyWith(done: true);
   }
 
   Future<void> _exitDiscoInfoCriticalSection(DiscoCacheKey key, Result<DiscoError, DiscoInfo> result) async {
@@ -322,34 +312,17 @@ class DiscoManager extends XmppManagerBase {
       return result;
     }
 
-    final error = stanza.firstTag('error');
+    if (stanza.attributes['type'] == 'error') {
-    if (error != null && stanza.attributes['type'] == 'error') {
+      //final error = stanza.firstTag('error');
       final result = Result<DiscoError, DiscoInfo>(ErrorResponseDiscoError());
       await _exitDiscoInfoCriticalSection(cacheKey, result);
       return result;
     }
     
-    final features = List<String>.empty(growable: true);
-    final identities = List<Identity>.empty(growable: true);
-
-    for (final element in query.children) {
-      if (element.tag == 'feature') {
-        features.add(element.attributes['var']! as String);
-      } else if (element.tag == 'identity') {
-        identities.add(Identity(
-          category: element.attributes['category']! as String,
-          type: element.attributes['type']! as String,
-          name: element.attributes['name'] as String?,
-        ),);
-      }
-    }
-
     final result = Result<DiscoError, DiscoInfo>(
-      DiscoInfo(
+      DiscoInfo.fromQuery(
-        features,
+        query,
-        identities,
+        JID.fromString(entity),
-        query.findTags('x', xmlns: dataFormsXmlns).map(parseDataForm).toList(),
-        JID.fromString(stanza.attributes['from']! as String),
       ),
     );
     await _exitDiscoInfoCriticalSection(cacheKey, result);
@@ -367,8 +340,8 @@ class DiscoManager extends XmppManagerBase {
     final query = stanza.firstTag('query');
     if (query == null) return Result(InvalidResponseDiscoError());
 
-    final error = stanza.firstTag('error');
+    if (stanza.type == 'error') {
-    if (error != null && stanza.type == 'error') {
+      //final error = stanza.firstTag('error');
       //print("Disco Items error: " + error.toXml());
       return Result(ErrorResponseDiscoError());
     }

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

@@ -1,10 +1,18 @@
 import 'dart:convert';
 import 'package:cryptography/cryptography.dart';
+import 'package:meta/meta.dart';
+import 'package:moxxmpp/src/managers/base.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/stringxml.dart';
 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_0414.dart';
 
+@immutable
 class CapabilityHashInfo {
-
   const CapabilityHashInfo(this.ver, this.node, this.hash);
   final String ver;
   final String node;
@@ -57,3 +65,86 @@ Future<String> calculateCapabilityHash(DiscoInfo info, HashAlgorithm algorithm)
   
   return base64.encode((await algorithm.hash(utf8.encode(buffer.toString()))).bytes);
 }
+
+/// A manager implementing the advertising of XEP-0115. It responds to the
+/// disco#info requests on the specified node with the information provided by
+/// the DiscoManager.
+/// NOTE: This manager requires that the DiscoManager is also registered.
+class EntityCapabilitiesManager extends XmppManagerBase {
+  EntityCapabilitiesManager(this._capabilityHashBase) : super();
+
+  /// The string that is both the node under which we advertise the disco info
+  /// and the base for the actual node on which we respond to disco#info requests.
+  final String _capabilityHashBase;
+
+  /// The cached capability hash.
+  String? _capabilityHash;
+
+  @override
+  String getName() => 'EntityCapabilitiesManager';
+  
+  @override
+  String getId() => entityCapabilitiesManager;
+
+  @override
+  Future<bool> isSupported() async => true;
+
+  @override
+  List<String> getDiscoFeatures() => [
+    capsXmlns,
+  ];
+
+  /// Computes, if required, the capability hash of the data provided by
+  /// the DiscoManager.
+  Future<String> getCapabilityHash() async {
+    _capabilityHash ??= await calculateCapabilityHash(
+      getAttributes()
+        .getManagerById<DiscoManager>(discoManager)!
+        .getDiscoInfo(null),
+      getHashByName('sha-1')!,
+    );
+
+    return _capabilityHash!;
+  }
+
+  Future<String> _getNode() async {
+    final hash = await getCapabilityHash();
+    return '$_capabilityHashBase#$hash';
+  }
+  
+  Future<DiscoInfo> _onInfoQuery() async {
+    return getAttributes()
+      .getManagerById<DiscoManager>(discoManager)!
+      .getDiscoInfo(await _getNode());
+  }
+
+  Future<List<XMLNode>> _prePresenceSent() async {
+    return [
+      XMLNode.xmlns(
+        tag: 'c',
+        xmlns: capsXmlns,
+        attributes: {
+          'hash': 'sha-1',
+          'node': _capabilityHashBase,
+          'ver': await getCapabilityHash(),
+        },
+      ),
+    ];
+  }
+  
+  @override
+  Future<void> postRegisterCallback() async {
+    await super.postRegisterCallback();
+    
+    getAttributes().getManagerById<DiscoManager>(discoManager)!.registerInfoCallback(
+        await _getNode(),
+        _onInfoQuery,
+      );
+
+    getAttributes()
+      .getManagerById<PresenceManager>(presenceManager)!
+      .registerPreSendCallback(
+        _prePresenceSent,
+      );
+  }
+}

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

@@ -9,14 +9,14 @@ import 'package:moxxmpp/src/stanza.dart';
 /// Data summarizing the XEP-0461 data.
 class ReplyData {
   const ReplyData({
-    required this.to,
     required this.id,
+    this.to,
     this.start,
     this.end,
   });
 
   /// The bare JID to whom the reply applies to
-  final String to;
+  final String? to;
 
   /// The stanza ID of the message that is replied to
   final String id;
@@ -72,6 +72,11 @@ class MessageRepliesManager extends XmppManagerBase {
   @override
   String getId() => messageRepliesManager;
 
+  @override
+  List<String> getDiscoFeatures() => [
+    replyXmlns,
+  ];
+  
   @override
   List<StanzaHandler> getIncomingStanzaHandlers() => [
     StanzaHandler(
@@ -90,7 +95,7 @@ class MessageRepliesManager extends XmppManagerBase {
   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 to = reply.attributes['to'] as String?;
     int? start;
     int? end;
 
@@ -102,11 +107,13 @@ class MessageRepliesManager extends XmppManagerBase {
       end = int.parse(body.attributes['end']! as String);
     }
 
-    return state.copyWith(reply: ReplyData(
+    return state.copyWith(
+      reply: ReplyData(
         id: id,
         to: to,
         start: start,
         end: end,
-    ),);
+      ),
+    );
   }
 }

packages/moxxmpp/moxxmpp.doap

@@ -0,0 +1,276 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'
+         xmlns='http://usefulinc.com/ns/doap#'
+	 xmlns:foaf='http://xmlns.com/foaf/0.1/'
+	 xmlns:xmpp='https://linkmauve.fr/ns/xmpp-doap#'>
+  <Project xml:lang='en'>
+    <name>moxxmpp</name>
+    <created>2021-12-26</created>
+    <homepage rdf:resource='https://codeberg.org/moxxy/moxxmpp'/>
+    <os>Linux</os>
+    <os>Windows</os>
+    <os>macOS</os>
+    <os>Android</os>
+    <os>iOS</os>
+
+    <programming-language>Dart</programming-language>
+
+    <maintainer>
+      <foaf:Person>
+	<foaf:name>Alexander "Polynomdivision"</foaf:name>
+	<foaf:homepage rdf:resource="https://blog.polynom.me" />
+      </foaf:Person>
+    </maintainer>
+
+    <implements rdf:resource="https://xmpp.org/rfcs/rfc6120.html" />
+
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0004.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>2.13.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0030.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>2.5rc3</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0054.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>1.2</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0060.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>1.24.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0066.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:note xml:lang="en">Only jabber:x:oob</xmpp:note>
+	<xmpp:version>1.5</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0084.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:note xml:lang="en">Receiving data</xmpp:note>
+	<xmpp:version>1.1.4</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0085.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>2.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0115.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>1.5.2</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0153.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>1.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0184.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>1.4.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0191.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>1.3.0</xmpp:version>
+	<xmpp:note xml:lang="en">Not plugged into the UI</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0198.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>1.6</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0280.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>1.0.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0297.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:note xml:lang="en">Exists only as part of support for XEP-0280</xmpp:note>
+	<xmpp:version>1.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0300.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:note xml:lang="en">Supports only Sha256, Sha512 and blake2b512</xmpp:note>
+	<xmpp:version>1.0.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0308.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>1.2.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0333.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:note xml:lang="en">Read-only support</xmpp:note>
+	<xmpp:version>0.4</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0334.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:note xml:lang="en">Write-only support</xmpp:note>
+	<xmpp:version>0.3.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0352.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>1.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0359.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.6.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0363.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>1.1.0</xmpp:version>
+	<xmpp:note xml:lang="en">Only handles the success case; not accessible via the App</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0368.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>1.1.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0380.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.4.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0384.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.8.3</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0420.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>0.4.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0424.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.3.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0444.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.1.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0446.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.2.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0447.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.1.2</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0448.html" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>0.2.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0449.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.1.1</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0461.html" />
+	<xmpp:status>complete</xmpp:status>
+	<xmpp:version>0.2.0</xmpp:version>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://codeberg.org/moxxy/custom-xeps/src/branch/master/xep-xxxx-extensible-file-thumbnails.md" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>0.2.1</xmpp:version>
+	<xmpp:note xml:lang="en">Only Blurhash is implemented</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
+    <implements>
+      <xmpp:SupportedXep>
+	<xmpp:xep rdf:resource="https://codeberg.org/moxxy/custom-xeps/src/branch/master/xep-xxxx-file-upload-notification.md" />
+	<xmpp:status>partial</xmpp:status>
+	<xmpp:version>0.0.5</xmpp:version>
+	<xmpp:note xml:lang="en">Sending and receiving implemented; cancellation not implemented</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
+  </Project>
+</rdf:RDF>

packages/moxxmpp/test/async_queue_test.dart

@@ -0,0 +1,43 @@
+import 'package:moxxmpp/src/util/queue.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('Test the async queue', () async {
+    final queue = AsyncQueue();
+    int future1Finish = 0;
+    int future2Finish = 0;
+    int future3Finish = 0;
+
+    await queue.addJob(() => Future<void>.delayed(const Duration(seconds: 3), () => future1Finish = DateTime.now().millisecondsSinceEpoch));
+    await queue.addJob(() => Future<void>.delayed(const Duration(seconds: 3), () => future2Finish = DateTime.now().millisecondsSinceEpoch));
+    await queue.addJob(() => Future<void>.delayed(const Duration(seconds: 3), () => future3Finish = DateTime.now().millisecondsSinceEpoch));
+
+    await Future<void>.delayed(const Duration(seconds: 12));
+
+    // The three futures must be done
+    expect(future1Finish != 0, true);
+    expect(future2Finish != 0, true);
+    expect(future3Finish != 0, true);
+
+    // The end times of the futures must be ordered (on a timeline)
+    // |-- future1Finish -- future2Finish -- future3Finish --|
+    expect(
+      future1Finish < future2Finish && future1Finish < future3Finish,
+      true,
+    );
+    expect(
+      future2Finish < future3Finish && future2Finish > future1Finish,
+      true,
+    );
+    expect(
+      future3Finish > future1Finish && future3Finish > future2Finish,
+      true,
+    );
+
+    // The queue must be empty at the end
+    expect(queue.queue.isEmpty, true);
+
+    // The queue must not be executing anything at the end
+    expect(queue.isRunning, false);
+  });
+}

packages/moxxmpp/test/negotiator_test.dart

@@ -54,16 +54,20 @@ void main() {
     ],
   );
   
-  final connection = XmppConnection(TestingReconnectionPolicy(), stubSocket)
+  final connection = XmppConnection(
-    ..registerFeatureNegotiators([
+    TestingReconnectionPolicy(),
+    AlwaysConnectedConnectivityManager(),
+    stubSocket,
+  )..registerFeatureNegotiators([
       StubNegotiator1(),
       StubNegotiator2(),
     ])
     ..registerManagers([
-      PresenceManager('http://moxxmpp.example'),
+      PresenceManager(),
       RosterManager(TestingRosterStateManager('', [])),
-      DiscoManager(),
+      DiscoManager([]),
       PingManager(),
+      EntityCapabilitiesManager('http://moxxmpp.example'),
     ])
     ..setConnectionSettings(
       ConnectionSettings(

packages/moxxmpp/test/xeps/xep_0004_test.dart

@@ -3,14 +3,14 @@ import 'package:test/test.dart';
 
 void main() {
   test('Parsing', () {
-      const testData = "<x xmlns='jabber:x:data' type='result'><field var='FORM_TYPE' type='hidden'><value>urn:xmpp:dataforms:softwareinfo</value></field><field var='ip_version' type='text-multi' ><value>ipv4</value><value>ipv6</value></field><field var='os'><value>Mac</value></field><field var='os_version'><value>10.5.1</value></field><field var='software'><value>Psi</value></field><field var='software_version'><value>0.11</value></field></x>";
+    const testData = "<x xmlns='jabber:x:data' type='result'><field var='FORM_TYPE' type='hidden'><value>urn:xmpp:dataforms:softwareinfo</value></field><field var='ip_version' type='text-multi' ><value>ipv4</value><value>ipv6</value></field><field var='os'><value>Mac</value></field><field var='os_version'><value>10.5.1</value></field><field var='software'><value>Psi</value></field><field var='software_version'><value>0.11</value></field></x>";
 
-      final form = parseDataForm(XMLNode.fromString(testData));
+    final form = parseDataForm(XMLNode.fromString(testData));
-      expect(form.getFieldByVar('FORM_TYPE')?.values.first, 'urn:xmpp:dataforms:softwareinfo');
+    expect(form.getFieldByVar('FORM_TYPE')?.values.first, 'urn:xmpp:dataforms:softwareinfo');
-      expect(form.getFieldByVar('ip_version')?.values, [ 'ipv4', 'ipv6' ]);
+    expect(form.getFieldByVar('ip_version')?.values, [ 'ipv4', 'ipv6' ]);
-      expect(form.getFieldByVar('os')?.values.first, 'Mac');
+    expect(form.getFieldByVar('os')?.values.first, 'Mac');
-      expect(form.getFieldByVar('os_version')?.values.first, '10.5.1');
+    expect(form.getFieldByVar('os_version')?.values.first, '10.5.1');
-      expect(form.getFieldByVar('software')?.values.first, 'Psi');
+    expect(form.getFieldByVar('software')?.values.first, 'Psi');
-      expect(form.getFieldByVar('software_version')?.values.first, '0.11');
+    expect(form.getFieldByVar('software_version')?.values.first, '0.11');
   });
 }

packages/moxxmpp/test/xeps/xep_0030_test.dart

@@ -53,7 +53,7 @@ void main() {
           ignoreId: true,
         ),
         StringExpectation(
-          "<presence xmlns='jabber:client' from='polynomdivision@test.server/MU29eEZn'><show>chat</show><c xmlns='http://jabber.org/protocol/caps' hash='sha-1' node='http://moxxmpp.example' ver='QRTBC5cg/oYd+UOTYazSQR4zb/I=' /></presence>",
+          "<presence xmlns='jabber:client' from='polynomdivision@test.server/MU29eEZn'><show>chat</show><c xmlns='http://jabber.org/protocol/caps' hash='sha-1' node='http://moxxmpp.example' ver='3QvQ2RAy45XBDhArjxy/vEWMl+E=' /></presence>",
           '',
         ),
         StanzaExpectation(
@@ -65,7 +65,11 @@ void main() {
 
       ],
     );
-    final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), socket: fakeSocket);
+    final XmppConnection conn = XmppConnection(
+      TestingReconnectionPolicy(),
+      AlwaysConnectedConnectivityManager(),
+      fakeSocket,
+    );
     conn.setConnectionSettings(ConnectionSettings(
         jid: JID.fromString('polynomdivision@test.server'),
         password: 'aaaa',
@@ -73,10 +77,11 @@ void main() {
         allowPlainAuth: true,
     ),);
     conn.registerManagers([
-      PresenceManager('http://moxxmpp.example'),
+      PresenceManager(),
-      RosterManager(),
+      RosterManager(TestingRosterStateManager(null, [])),
-      DiscoManager(),
+      DiscoManager([]),
       PingManager(),
+      EntityCapabilitiesManager('http://moxxmpp.example'),
     ]);
     conn.registerFeatureNegotiators(
       [

packages/moxxmpp/test/xeps/xep_0115_test.dart

@@ -4,164 +4,167 @@ import 'package:test/test.dart';
 
 void main() {
   test('Test XEP example', () async {
-      final data = DiscoInfo(
+    final data = DiscoInfo(
-        [
+      [
-          'http://jabber.org/protocol/caps',
+        'http://jabber.org/protocol/caps',
-          'http://jabber.org/protocol/disco#info',
+        'http://jabber.org/protocol/disco#info',
-          'http://jabber.org/protocol/disco#items',
+        'http://jabber.org/protocol/disco#items',
-          'http://jabber.org/protocol/muc'
+        'http://jabber.org/protocol/muc'
-        ],
+      ],
-        [
+      [
-          Identity(
+        Identity(
-            category: 'client',
+          category: 'client',
-            type: 'pc',
+          type: 'pc',
-            name: 'Exodus 0.9.1',
+          name: 'Exodus 0.9.1',
-          )
+        )
-        ],
+      ],
-        [],
+      [],
-        JID.fromString('some@user.local/test'),
+      null,
-      );
+      JID.fromString('some@user.local/test'),
+    );
 
-      final hash = await calculateCapabilityHash(data, Sha1());
+    final hash = await calculateCapabilityHash(data, Sha1());
-      expect(hash, 'QgayPKawpkPSDYmwT/WM94uAlu0=');
+    expect(hash, 'QgayPKawpkPSDYmwT/WM94uAlu0=');
   });
 
   test('Test complex generation example', () async {
-      const extDiscoDataString = "<x xmlns='jabber:x:data' type='result'><field var='FORM_TYPE' type='hidden'><value>urn:xmpp:dataforms:softwareinfo</value></field><field var='ip_version' type='text-multi' ><value>ipv4</value><value>ipv6</value></field><field var='os'><value>Mac</value></field><field var='os_version'><value>10.5.1</value></field><field var='software'><value>Psi</value></field><field var='software_version'><value>0.11</value></field></x>";
+    const extDiscoDataString = "<x xmlns='jabber:x:data' type='result'><field var='FORM_TYPE' type='hidden'><value>urn:xmpp:dataforms:softwareinfo</value></field><field var='ip_version' type='text-multi' ><value>ipv4</value><value>ipv6</value></field><field var='os'><value>Mac</value></field><field var='os_version'><value>10.5.1</value></field><field var='software'><value>Psi</value></field><field var='software_version'><value>0.11</value></field></x>";
-      final data = DiscoInfo(
+    final data = DiscoInfo(
-        [
+      [
-          'http://jabber.org/protocol/caps',
+        'http://jabber.org/protocol/caps',
-          'http://jabber.org/protocol/disco#info',
+        'http://jabber.org/protocol/disco#info',
-          'http://jabber.org/protocol/disco#items',
+        'http://jabber.org/protocol/disco#items',
-          'http://jabber.org/protocol/muc'
+        'http://jabber.org/protocol/muc'
-        ],
+      ],
-        [
+      [
-          const Identity(
+        const Identity(
-            category: 'client',
+          category: 'client',
-            type: 'pc',
+          type: 'pc',
-            name: 'Psi 0.11',
+          name: 'Psi 0.11',
-            lang: 'en',
+          lang: 'en',
-          ),
+        ),
-          const Identity(
+        const Identity(
-            category: 'client',
+          category: 'client',
-            type: 'pc',
+          type: 'pc',
-            name: 'Ψ 0.11',
+          name: 'Ψ 0.11',
-            lang: 'el',
+          lang: 'el',
-          ),
+        ),
-        ],
+      ],
-        [ parseDataForm(XMLNode.fromString(extDiscoDataString)) ],
+      [ parseDataForm(XMLNode.fromString(extDiscoDataString)) ],
-        JID.fromString('some@user.local/test'),
+      null,
-      );
+      JID.fromString('some@user.local/test'),
+    );
 
-      final hash = await calculateCapabilityHash(data, Sha1());
+    final hash = await calculateCapabilityHash(data, Sha1());
-      expect(hash, 'q07IKJEyjvHSyhy//CH0CxmKi8w=');
+    expect(hash, 'q07IKJEyjvHSyhy//CH0CxmKi8w=');
   });
   
   test('Test Gajim capability hash computation', () async {
-      // TODO: This one fails
+    // TODO: This one fails
-      /*
+    /*
-      final data = DiscoInfo(
+    final data = DiscoInfo(
-        features: [
+      features: [
-          "http://jabber.org/protocol/bytestreams",
+        "http://jabber.org/protocol/bytestreams",
-          "http://jabber.org/protocol/muc",
+        "http://jabber.org/protocol/muc",
-          "http://jabber.org/protocol/commands",
+        "http://jabber.org/protocol/commands",
-          "http://jabber.org/protocol/disco#info",
+        "http://jabber.org/protocol/disco#info",
-          "jabber:iq:last",
+        "jabber:iq:last",
-          "jabber:x:data",
+        "jabber:x:data",
-          "jabber:x:encrypted",
+        "jabber:x:encrypted",
-          "urn:xmpp:ping",
+        "urn:xmpp:ping",
-          "http://jabber.org/protocol/chatstates",
+        "http://jabber.org/protocol/chatstates",
-          "urn:xmpp:receipts",
+        "urn:xmpp:receipts",
-          "urn:xmpp:time",
+        "urn:xmpp:time",
-          "jabber:iq:version",
+        "jabber:iq:version",
-          "http://jabber.org/protocol/rosterx",
+        "http://jabber.org/protocol/rosterx",
-          "urn:xmpp:sec-label:0",
+        "urn:xmpp:sec-label:0",
-          "jabber:x:conference",
+        "jabber:x:conference",
-          "urn:xmpp:message-correct:0",
+        "urn:xmpp:message-correct:0",
-          "urn:xmpp:chat-markers:0",
+        "urn:xmpp:chat-markers:0",
-          "urn:xmpp:eme:0",
+        "urn:xmpp:eme:0",
-          "http://jabber.org/protocol/xhtml-im",
+        "http://jabber.org/protocol/xhtml-im",
-          "urn:xmpp:hashes:2",
+        "urn:xmpp:hashes:2",
-          "urn:xmpp:hash-function-text-names:md5",
+        "urn:xmpp:hash-function-text-names:md5",
-          "urn:xmpp:hash-function-text-names:sha-1",
+        "urn:xmpp:hash-function-text-names:sha-1",
-          "urn:xmpp:hash-function-text-names:sha-256",
+        "urn:xmpp:hash-function-text-names:sha-256",
-          "urn:xmpp:hash-function-text-names:sha-512",
+        "urn:xmpp:hash-function-text-names:sha-512",
-          "urn:xmpp:hash-function-text-names:sha3-256",
+        "urn:xmpp:hash-function-text-names:sha3-256",
-          "urn:xmpp:hash-function-text-names:sha3-512",
+        "urn:xmpp:hash-function-text-names:sha3-512",
-          "urn:xmpp:hash-function-text-names:id-blake2b256",
+        "urn:xmpp:hash-function-text-names:id-blake2b256",
-          "urn:xmpp:hash-function-text-names:id-blake2b512",
+        "urn:xmpp:hash-function-text-names:id-blake2b512",
-          "urn:xmpp:jingle:1",
+        "urn:xmpp:jingle:1",
-          "urn:xmpp:jingle:apps:file-transfer:5",
+        "urn:xmpp:jingle:apps:file-transfer:5",
-          "urn:xmpp:jingle:security:xtls:0",
+        "urn:xmpp:jingle:security:xtls:0",
-          "urn:xmpp:jingle:transports:s5b:1",
+        "urn:xmpp:jingle:transports:s5b:1",
-          "urn:xmpp:jingle:transports:ibb:1",
+        "urn:xmpp:jingle:transports:ibb:1",
-          "urn:xmpp:avatar:metadata+notify",
+        "urn:xmpp:avatar:metadata+notify",
-          "urn:xmpp:message-moderate:0",
+        "urn:xmpp:message-moderate:0",
-          "http://jabber.org/protocol/tune+notify",
+        "http://jabber.org/protocol/tune+notify",
-          "http://jabber.org/protocol/geoloc+notify",
+        "http://jabber.org/protocol/geoloc+notify",
-          "http://jabber.org/protocol/nick+notify",
+        "http://jabber.org/protocol/nick+notify",
-          "eu.siacs.conversations.axolotl.devicelist+notify",
+        "eu.siacs.conversations.axolotl.devicelist+notify",
-        ],
+      ],
-        identities: [
+      identities: [
-          Identity(
+        Identity(
-            category: "client",
+          category: "client",
-            type: "pc",
+          type: "pc",
-            name: "Gajim"
+          name: "Gajim"
-          )
+        )
-        ]
+      ]
-      );
+    );
 
-      final hash = await calculateCapabilityHash(data, Sha1());
+    final hash = await calculateCapabilityHash(data, Sha1());
-      expect(hash, "T7fOZrtBnV8sDA2fFTS59vyOyUs=");
+    expect(hash, "T7fOZrtBnV8sDA2fFTS59vyOyUs=");
-      */
+    */
   });
 
   test('Test Conversations hash computation', () async {
-      final data = DiscoInfo(
+    final data = DiscoInfo(
-        [
+      [
-          'eu.siacs.conversations.axolotl.devicelist+notify',
+        'eu.siacs.conversations.axolotl.devicelist+notify',
-          'http://jabber.org/protocol/caps',
+        'http://jabber.org/protocol/caps',
-          'http://jabber.org/protocol/chatstates',
+        'http://jabber.org/protocol/chatstates',
-          'http://jabber.org/protocol/disco#info',
+        'http://jabber.org/protocol/disco#info',
-          'http://jabber.org/protocol/muc',
+        'http://jabber.org/protocol/muc',
-          'http://jabber.org/protocol/nick+notify',
+        'http://jabber.org/protocol/nick+notify',
-          'jabber:iq:version',
+        'jabber:iq:version',
-          'jabber:x:conference',
+        'jabber:x:conference',
-          'jabber:x:oob',
+        'jabber:x:oob',
-          'storage:bookmarks+notify',
+        'storage:bookmarks+notify',
-          'urn:xmpp:avatar:metadata+notify',
+        'urn:xmpp:avatar:metadata+notify',
-          'urn:xmpp:chat-markers:0',
+        'urn:xmpp:chat-markers:0',
-          'urn:xmpp:jingle-message:0',
+        'urn:xmpp:jingle-message:0',
-          'urn:xmpp:jingle:1',
+        'urn:xmpp:jingle:1',
-          'urn:xmpp:jingle:apps:dtls:0',
+        'urn:xmpp:jingle:apps:dtls:0',
-          'urn:xmpp:jingle:apps:file-transfer:3',
+        'urn:xmpp:jingle:apps:file-transfer:3',
-          'urn:xmpp:jingle:apps:file-transfer:4',
+        'urn:xmpp:jingle:apps:file-transfer:4',
-          'urn:xmpp:jingle:apps:file-transfer:5',
+        'urn:xmpp:jingle:apps:file-transfer:5',
-          'urn:xmpp:jingle:apps:rtp:1',
+        'urn:xmpp:jingle:apps:rtp:1',
-          'urn:xmpp:jingle:apps:rtp:audio',
+        'urn:xmpp:jingle:apps:rtp:audio',
-          'urn:xmpp:jingle:apps:rtp:video',
+        'urn:xmpp:jingle:apps:rtp:video',
-          'urn:xmpp:jingle:jet-omemo:0',
+        'urn:xmpp:jingle:jet-omemo:0',
-          'urn:xmpp:jingle:jet:0',
+        'urn:xmpp:jingle:jet:0',
-          'urn:xmpp:jingle:transports:ibb:1',
+        'urn:xmpp:jingle:transports:ibb:1',
-          'urn:xmpp:jingle:transports:ice-udp:1',
+        'urn:xmpp:jingle:transports:ice-udp:1',
-          'urn:xmpp:jingle:transports:s5b:1',
+        'urn:xmpp:jingle:transports:s5b:1',
-          'urn:xmpp:message-correct:0',
+        'urn:xmpp:message-correct:0',
-          'urn:xmpp:ping',
+        'urn:xmpp:ping',
-          'urn:xmpp:receipts',
+        'urn:xmpp:receipts',
-          'urn:xmpp:time'
+        'urn:xmpp:time'
-        ],
+      ],
-        [
+      [
-          Identity(
+        Identity(
-            category: 'client',
+          category: 'client',
-            type: 'phone',
+          type: 'phone',
-            name: 'Conversations',
+          name: 'Conversations',
-          )
+        )
-        ],
+      ],
-        [],
+      [],
-        JID.fromString('user@server.local/test'),
+      null,
-      );
+      JID.fromString('user@server.local/test'),
+    );
 
-      final hash = await calculateCapabilityHash(data, Sha1());
+    final hash = await calculateCapabilityHash(data, Sha1());
-      expect(hash, 'zcIke+Rk13ah4d1pwDG7bEZsVwA=');
+    expect(hash, 'zcIke+Rk13ah4d1pwDG7bEZsVwA=');
   });
 }

packages/moxxmpp/test/xeps/xep_0198_test.dart

@@ -34,7 +34,7 @@ XmppManagerAttributes mkAttributes(void Function(Stanza) callback) {
     isFeatureSupported: (_) => false,
     getFullJID: () => JID.fromString('hallo@example.server/uwu'),
     getSocket: () => StubTCPSocket(play: []),
-    getConnection: () => XmppConnection(TestingReconnectionPolicy(), StubTCPSocket(play: [])),
+    getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
     getNegotiatorById: getNegotiatorNullStub,
   );
 }
@@ -233,7 +233,11 @@ void main() {
         ]
       );
 
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -242,12 +246,13 @@ void main() {
       ),);
       final sm = StreamManagementManager();
       conn.registerManagers([
-          PresenceManager('http://moxxmpp.example'),
+        PresenceManager(),
-          RosterManager(TestingRosterStateManager('', [])),
+        RosterManager(TestingRosterStateManager('', [])),
-          DiscoManager(),
+        DiscoManager([]),
-          PingManager(),
+        PingManager(),
-          sm,
+        sm,
-          CarbonsManager()..forceEnable(),
+        CarbonsManager()..forceEnable(),
+        EntityCapabilitiesManager('http://moxxmpp.example'),
       ]);
       conn.registerFeatureNegotiators(
         [
@@ -343,7 +348,7 @@ void main() {
             '<enabled xmlns="urn:xmpp:sm:3" id="some-long-sm-id" resume="true" />',
           ),
           StringExpectation(
-            "<presence xmlns='jabber:client' from='polynomdivision@test.server/MU29eEZn'><show>chat</show><c xmlns='http://jabber.org/protocol/caps' hash='sha-1' node='http://moxxmpp.example' ver='QRTBC5cg/oYd+UOTYazSQR4zb/I=' /></presence>",
+            "<presence xmlns='jabber:client' from='polynomdivision@test.server/MU29eEZn'><show>chat</show><c xmlns='http://jabber.org/protocol/caps' hash='sha-1' node='http://moxxmpp.example' ver='3QvQ2RAy45XBDhArjxy/vEWMl+E=' /></presence>",
             '<iq type="result" />',
           ),
           StanzaExpectation(
@@ -355,7 +360,11 @@ void main() {
         ]
       );
 
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -364,12 +373,13 @@ void main() {
       ),);
       final sm = StreamManagementManager();
       conn.registerManagers([
-          PresenceManager('http://moxxmpp.example'),
+          PresenceManager(),
           RosterManager(TestingRosterStateManager('', [])),
-          DiscoManager(),
+          DiscoManager([]),
           PingManager(),
           sm,
           CarbonsManager()..forceEnable(),
+          EntityCapabilitiesManager('http://moxxmpp.example'),
       ]);
       conn.registerFeatureNegotiators(
         [
@@ -510,7 +520,11 @@ void main() {
         ]
       );
 
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -518,9 +532,9 @@ void main() {
           allowPlainAuth: true,
       ),);
       conn.registerManagers([
-          PresenceManager('http://moxxmpp.example'),
+          PresenceManager(),
           RosterManager(TestingRosterStateManager('', [])),
-          DiscoManager(),
+          DiscoManager([]),
           PingManager(),
           StreamManagementManager(),
       ]);
@@ -602,7 +616,11 @@ void main() {
         ]
       );
 
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -610,9 +628,9 @@ void main() {
           allowPlainAuth: true,
       ),);
       conn.registerManagers([
-          PresenceManager('http://moxxmpp.example'),
+          PresenceManager(),
           RosterManager(TestingRosterStateManager('', [])),
-          DiscoManager(),
+          DiscoManager([]),
           PingManager(),
           StreamManagementManager(),
       ]);
@@ -694,7 +712,11 @@ void main() {
         ]
       );
 
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -702,9 +724,9 @@ void main() {
           allowPlainAuth: true,
       ),);
       conn.registerManagers([
-          PresenceManager('http://moxxmpp.example'),
+          PresenceManager(),
           RosterManager(TestingRosterStateManager('', [])),
-          DiscoManager(),
+          DiscoManager([]),
           PingManager(),
           StreamManagementManager(),
       ]);

packages/moxxmpp/test/xeps/xep_0280_test.dart

@@ -22,7 +22,7 @@ void main() {
       isFeatureSupported: (_) => false,
       getFullJID: () => JID.fromString('bob@xmpp.example/uwu'),
       getSocket: () => StubTCPSocket(play: []),
-      getConnection: () => XmppConnection(TestingReconnectionPolicy(), StubTCPSocket(play: [])),
+      getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
       getNegotiatorById: getNegotiatorNullStub,
     );
     final manager = CarbonsManager();

packages/moxxmpp/test/xeps/xep_0352_test.dart

@@ -50,7 +50,7 @@ void main() {
           isFeatureSupported: (_) => false,
           getFullJID: () => JID.fromString('some.user@example.server/aaaaa'),
           getSocket: () => StubTCPSocket(play: []),
-          getConnection: () => XmppConnection(TestingReconnectionPolicy(), StubTCPSocket(play: [])),
+          getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
         ),
       );
 
@@ -79,7 +79,7 @@ void main() {
           isFeatureSupported: (_) => false,
           getFullJID: () => JID.fromString('some.user@example.server/aaaaa'),
           getSocket: () => StubTCPSocket(play: []),
-          getConnection: () => XmppConnection(TestingReconnectionPolicy(), StubTCPSocket(play: [])),
+          getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
         ),
       );
 

packages/moxxmpp/test/xeps/xep_0363_test.dart

@@ -3,52 +3,52 @@ import 'package:test/test.dart';
 
 void main() {
   group('Test the XEP-0363 header preparation', () {
-      test('invariance', () {
+    test('invariance', () {
-          final headers = {
+      final headers = {
-            'authorization': 'Basic Base64String==',
+        'authorization': 'Basic Base64String==',
-            'cookie': 'foo=bar; user=romeo'
+        'cookie': 'foo=bar; user=romeo'
-          };
+      };
-          expect(
+      expect(
-            prepareHeaders(headers),
+        prepareHeaders(headers),
-            headers,
+        headers,
-          );
+      );
-      });
+    });
-      test('invariance through uppercase', () {
+    test('invariance through uppercase', () {
-          final headers = {
+      final headers = {
-            'Authorization': 'Basic Base64String==',
+        'Authorization': 'Basic Base64String==',
-            'Cookie': 'foo=bar; user=romeo'
+        'Cookie': 'foo=bar; user=romeo'
-          };
+      };
-          expect(
+      expect(
-            prepareHeaders(headers),
+        prepareHeaders(headers),
-            headers,
+        headers,
-          );
+      );
-      });
+    });
-      test('remove unspecified headers', () {
+    test('remove unspecified headers', () {
-          final headers = {
+      final headers = {
-            'Authorization': 'Basic Base64String==',
+        'Authorization': 'Basic Base64String==',
-            'Cookie': 'foo=bar; user=romeo',
+        'Cookie': 'foo=bar; user=romeo',
-            'X-Tracking': 'Base64String=='
+        'X-Tracking': 'Base64String=='
-          };
+      };
-          expect(
+      expect(
-            prepareHeaders(headers),
+        prepareHeaders(headers),
-            {
+        {
-              'Authorization': 'Basic Base64String==',
+          'Authorization': 'Basic Base64String==',
-              'Cookie': 'foo=bar; user=romeo',
+          'Cookie': 'foo=bar; user=romeo',
-            }
+        }
-          );
+      );
-      });
+    });
-      test('remove newlines', () {
+    test('remove newlines', () {
-          final headers = {
+      final headers = {
-            'Authorization': '\n\nBasic Base64String==\n\n',
+        'Authorization': '\n\nBasic Base64String==\n\n',
-            '\nCookie\r\n': 'foo=bar; user=romeo',
+        '\nCookie\r\n': 'foo=bar; user=romeo',
-          };
+      };
-          expect(
+      expect(
-            prepareHeaders(headers),
+        prepareHeaders(headers),
-            {
+        {
-              'Authorization': 'Basic Base64String==',
+          'Authorization': 'Basic Base64String==',
-              'Cookie': 'foo=bar; user=romeo',
+          'Cookie': 'foo=bar; user=romeo',
-            }
+        }
-          );
+      );
-      });
+    });
   });
 }

packages/moxxmpp/test/xmpp_test.dart

@@ -25,7 +25,7 @@ Future<bool> testRosterManager(String bareJid, String resource, String stanzaStr
       isFeatureSupported: (_) => false,
       getFullJID: () => JID.fromString('$bareJid/$resource'),
       getSocket: () => StubTCPSocket(play: []),
-      getConnection: () => XmppConnection(TestingReconnectionPolicy(), StubTCPSocket(play: [])),
+      getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
   ),);
 
   final stanza = Stanza.fromXMLNode(XMLNode.fromString(stanzaString));
@@ -118,7 +118,10 @@ void main() {
         ],
       );
       // TODO: This test is broken since we query the server and enable carbons
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket);
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -126,11 +129,12 @@ void main() {
           allowPlainAuth: true,
       ),);
       conn.registerManagers([
-        PresenceManager('http://moxxmpp.example'),
+        PresenceManager(),
         RosterManager(TestingRosterStateManager('', [])),
-        DiscoManager(),
+        DiscoManager([]),
         PingManager(),
         StreamManagementManager(),
+        EntityCapabilitiesManager('http://moxxmpp.example'),
       ]);
       conn.registerFeatureNegotiators(
         [
@@ -172,7 +176,11 @@ void main() {
         ],
       );
       var receivedEvent = false;
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
         jid: JID.fromString('polynomdivision@test.server'),
         password: 'aaaa',
@@ -180,10 +188,11 @@ void main() {
         allowPlainAuth: true,
       ),);
       conn.registerManagers([
-        PresenceManager('http://moxxmpp.example'),
+        PresenceManager(),
         RosterManager(TestingRosterStateManager('', [])),
-        DiscoManager(),
+        DiscoManager([]),
         PingManager(),
+        EntityCapabilitiesManager('http://moxxmpp.example'),
       ]);
       conn.registerFeatureNegotiators([
         SaslPlainNegotiator()
@@ -226,7 +235,11 @@ void main() {
         ],
       );
       var receivedEvent = false;
-      final XmppConnection conn = XmppConnection(TestingReconnectionPolicy(), fakeSocket);
+      final XmppConnection conn = XmppConnection(
+        TestingReconnectionPolicy(),
+        AlwaysConnectedConnectivityManager(),
+        fakeSocket,
+      );
       conn.setConnectionSettings(ConnectionSettings(
           jid: JID.fromString('polynomdivision@test.server'),
           password: 'aaaa',
@@ -234,10 +247,11 @@ void main() {
           allowPlainAuth: true,
       ),);
       conn.registerManagers([
-        PresenceManager('http://moxxmpp.example'),
+        PresenceManager(),
         RosterManager(TestingRosterStateManager('', [])),
-        DiscoManager(),
+        DiscoManager([]),
         PingManager(),
+        EntityCapabilitiesManager('http://moxxmpp.example'),
       ]);
       conn.registerFeatureNegotiators([
         SaslPlainNegotiator()
@@ -326,7 +340,7 @@ void main() {
               isFeatureSupported: (_) => false,
               getFullJID: () => JID.fromString('some.user@example.server/aaaaa'),
               getSocket: () => StubTCPSocket(play: []),
-              getConnection: () => XmppConnection(TestingReconnectionPolicy(), StubTCPSocket(play: [])),
+              getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
           ),);
 
           // NOTE: Based on https://gultsch.de/gajim_roster_push_and_message_interception.html