Possibility to change a channel's topic

src/bridge/bridge.cpp

@@ -156,6 +156,13 @@ void Bridge::send_irc_kick(const Iid& iid, const std::string& target, const std:
     irc->send_kick_command(iid.chan, target, reason);
 }
 
+void Bridge::set_channel_topic(const Iid& iid, const std::string& subject)
+{
+  IrcClient* irc = this->get_irc_client(iid.server);
+  if (irc)
+    irc->send_topic_command(iid.chan, subject);
+}
+
 void Bridge::send_message(const Iid& iid, const std::string& nick, const std::string& body, const bool muc)
 {
   if (muc)

src/bridge/bridge.hpp

@@ -49,6 +49,7 @@ public:
   void leave_irc_channel(Iid&& iid, std::string&& status_message);
   void send_irc_nick_change(const Iid& iid, const std::string& new_nick);
   void send_irc_kick(const Iid& iid, const std::string& target, const std::string& reason);
+  void set_channel_topic(const Iid& iid, const std::string& subject);
 
   /***
    **

src/irc/irc_client.cpp

@@ -122,6 +122,11 @@ void IrcClient::send_kick_command(const std::string& chan_name, const std::strin
   this->send_message(IrcMessage("KICK", {chan_name, target, reason}));
 }
 
+void IrcClient::send_topic_command(const std::string& chan_name, const std::string& topic)
+{
+  this->send_message(IrcMessage("TOPIC", {chan_name, topic}));
+}
+
 void IrcClient::send_quit_command()
 {
   this->send_message(IrcMessage("QUIT", {"gateway shutdown"}));

src/irc/irc_client.hpp

@@ -97,6 +97,7 @@ public:
    * Send the KICK irc command
    */
   void send_kick_command(const std::string& chan_name, const std::string& target, const std::string& reason);
+  void send_topic_command(const std::string& chan_name, const std::string& topic);
   /**
    * Send the QUIT irc command
    */

src/xmpp/xmpp_component.cpp

@@ -217,6 +217,9 @@ void XmppComponent::handle_message(const Stanza& stanza)
       if (to.resource.empty())
         if (body && !body->get_inner().empty())
           bridge->send_channel_message(iid, body->get_inner());
+      XmlNode* subject = stanza.get_child(COMPONENT_NS":subject");
+      if (subject)
+        bridge->set_channel_topic(iid, subject->get_inner());
     }
   else
     {