Add handler for m.room.topic events

.gitignore

@@ -59,3 +59,4 @@ Makefile.in
 /src/matrix-event-state-base.c
 /src/matrix-event-room-message.c
 /src/namespace-info.c
+/src/matrix-event-room-topic.c

src/Makefile.am

@@ -29,6 +29,7 @@ libmatrix_glib_0_0_la_VALA_SOURCES = \
 	matrix-event-presence.vala \
 	matrix-event-room-member.vala \
 	matrix-event-room-message.vala \
+	matrix-event-room-topic.vala \
 	$(NULL)
 
 AM_CPPFLAGS += \

src/matrix-event-room-topic.vala

@@ -0,0 +1,63 @@
+/*
+ * This file is part of matrix-glib-sdk
+ *
+ * matrix-glib-sdk is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * matrix-glib-sdk is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with matrix-glib-sdk. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Event type to hold the m.room.topic event.
+ *
+ * A topic is a short message detailing what is currently being
+ * discussed in the room. It can also be used as a way to display
+ * extra information about the room, which may not be suitable for the
+ * room name.
+ */
+public class Matrix.Event.RoomTopic : Matrix.Event.State {
+    /**
+     * The topic text.
+     */
+    public string? topic { get; set; default = null; }
+
+    protected override void
+    from_json(Json.Node json_data)
+        throws Matrix.Error
+    {
+        var root = json_data.get_object();
+        var content_root = root.get_member("content").get_object();
+        Json.Node? node;
+
+        if ((node = content_root.get_member("topic")) != null) {
+            _topic = node.get_string();
+        } else if (Config.DEBUG) {
+            warning("content.topic is missing from an m.room.topic event");
+        }
+
+        base.from_json(json_data);
+    }
+
+    protected override void
+    to_json(Json.Node json_data)
+        throws Matrix.Error
+    {
+        var root = json_data.get_object();
+        var content_root = root.get_member("content").get_object();
+
+        if (_topic != null) {
+            content_root.set_string_member("topic", _topic);
+        }
+
+        base.to_json(json_data);
+    }
+}

src/matrix-event-types.c

@@ -161,6 +161,9 @@ matrix_event_types_ctor(void)
     matrix_event_register_type("m.room.message",
                                MATRIX_EVENT_TYPE_ROOM_MESSAGE,
                                NULL);
+    matrix_event_register_type("m.room.topic",
+                               MATRIX_EVENT_TYPE_ROOM_TOPIC,
+                               NULL);
 }
 
 void