feat(xep): Set base for XEP 0045 implementation

Signed-off-by: Ikjot Singh Dhody <ikjotsd@gmail.com>

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 mucManager = 'org.moxxmpp.mucmanager';

packages/moxxmpp/lib/src/xeps/xep_0045/errors.dart

@@ -0,0 +1,3 @@
+abstract class MUCError {}
+
+class InvalidStanzaFormat extends MUCError {}

packages/moxxmpp/lib/src/xeps/xep_0045/types.dart

@@ -0,0 +1,37 @@
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxmpp/src/xeps/xep_0045/errors.dart';
+
+class RoomInformation {
+  RoomInformation({
+    required this.jid,
+    required this.features,
+    required this.name,
+  });
+
+  factory RoomInformation.fromStanza({
+    required String roomJID,
+    required XMLNode stanza,
+  }) {
+    final featureNodes = stanza.children[0].findTags('feature');
+    final identityNodes = stanza.children[0].findTags('identity');
+
+    if (featureNodes.isNotEmpty && identityNodes.isNotEmpty) {
+      final features = featureNodes
+          .map((xmlNode) => xmlNode.attributes['var'].toString())
+          .toList();
+      final name = identityNodes[0].attributes['name'].toString();
+
+      return RoomInformation(
+        jid: roomJID,
+        features: features,
+        name: name,
+      );
+    } else {
+      // ignore: only_throw_errors
+      throw InvalidStanzaFormat();
+    }
+  }
+  final String jid;
+  final List<String> features;
+  final String name;
+}

packages/moxxmpp/lib/src/xeps/xep_0045/xep_0045.dart

@@ -0,0 +1,36 @@
+import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxmpp/src/xeps/xep_0045/errors.dart';
+import 'package:moxxmpp/src/xeps/xep_0045/types.dart';
+
+class MUCManager extends XmppManagerBase {
+  MUCManager() : super(mucManager);
+
+  @override
+  Future<bool> isSupported() async => true;
+
+  Future<Result<RoomInformation, MUCError>> queryRoomInformation(
+      String roomJID) async {
+    final attrs = getAttributes();
+    try {
+      final result = await attrs.sendStanza(
+        StanzaDetails(
+          Stanza.iq(
+            type: 'get',
+            to: roomJID,
+            children: [
+              XMLNode.xmlns(
+                tag: 'query',
+                xmlns: discoInfoXmlns,
+              )
+            ],
+          ),
+        ),
+      );
+      final roomInformation =
+          RoomInformation.fromStanza(roomJID: roomJID, stanza: result!);
+      return Result(roomInformation);
+    } catch (e) {
+      return Result(InvalidStanzaFormat());
+    }
+  }
+}