On a client error, do not QUIT, just make the resource leave all channels

This should fix #3205

src/bridge/bridge.cpp

@@ -60,6 +60,20 @@ void Bridge::shutdown(const std::string& exit_message)
   }
 }
 
+void Bridge::remove_resource(const std::string& resource,
+                             const std::string& part_message)
+{
+  const auto resources_in_chan_copy = this->resources_in_chan;
+  for (const auto& chan_pair: resources_in_chan_copy)
+  {
+    const ChannelKey& channel_key = chan_pair.first;
+    const std::set<Resource>& resources = chan_pair.second;
+    if (resources.count(resource))
+      this->leave_irc_channel({std::get<0>(channel_key), std::get<1>(channel_key), {}},
+                              part_message, resource);
+  }
+}
+
 void Bridge::clean()
 {
   auto it = this->irc_clients.begin();
@@ -330,7 +344,7 @@ void Bridge::send_raw_message(const std::string& hostname, const std::string& bo
   irc->send_raw(body);
 }
 
-void Bridge::leave_irc_channel(Iid&& iid, std::string&& status_message, const std::string& resource)
+void Bridge::leave_irc_channel(Iid&& iid, const std::string& status_message, const std::string& resource)
 {
   IrcClient* irc = this->get_irc_client(iid.get_server());
   const auto key = iid.to_tuple();

src/bridge/bridge.hpp

@@ -44,6 +44,10 @@ public:
    * QUIT all connected IRC servers.
    */
   void shutdown(const std::string& exit_message);
+  /**
+   * PART the given resource from all the channels
+   */
+  void remove_resource(const std::string& resource, const std::string& part_message);
   /**
    * Remove all inactive IrcClients
    */
@@ -70,7 +74,7 @@ public:
   void send_channel_message(const Iid& iid, const std::string& body);
   void send_private_message(const Iid& iid, const std::string& body, const std::string& type="PRIVMSG");
   void send_raw_message(const std::string& hostname, const std::string& body);
-  void leave_irc_channel(Iid&& iid, std::string&& status_message, const std::string& resource);
+  void leave_irc_channel(Iid&& iid, const std::string& status_message, const std::string& resource);
   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,
                      const std::string& iq_id, const std::string& to_jid);

src/xmpp/biboumi_component.cpp

@@ -180,23 +180,24 @@ void BiboumiComponent::handle_presence(const Stanza& stanza)
 
 void BiboumiComponent::handle_message(const Stanza& stanza)
 {
-  std::string from = stanza.get_tag("from");
+  std::string from_str = stanza.get_tag("from");
   std::string id = stanza.get_tag("id");
   std::string to_str = stanza.get_tag("to");
   std::string type = stanza.get_tag("type");
 
-  if (from.empty())
+  if (from_str.empty())
     return;
   if (type.empty())
     type = "normal";
-  Bridge* bridge = this->get_user_bridge(from);
+  Bridge* bridge = this->get_user_bridge(from_str);
+  Jid from(from_str);
   Jid to(to_str);
   Iid iid(to.local, bridge);
 
   std::string error_type("cancel");
   std::string error_name("internal-server-error");
   utils::ScopeGuard stanza_error([&](){
-      this->send_stanza_error("message", from, to_str, id,
+      this->send_stanza_error("message", from_str, to_str, id,
                               error_type, error_name, "");
     });
   const XmlNode* body = stanza.get_child("body", COMPONENT_NS);
@@ -216,7 +217,7 @@ void BiboumiComponent::handle_message(const Stanza& stanza)
     {
       const XmlNode* error = stanza.get_child("error", COMPONENT_NS);
       // Only a set of errors are considered “fatal”. If we encounter one of
-      // them, we purge (we disconnect the user from all the IRC servers).
+      // them, we purge (we disconnect that resource from all the IRC servers)
       // We consider this to be true, unless the error condition is
       // specified and is not in the kickable_errors set
       bool kickable_error = true;
@@ -227,7 +228,7 @@ void BiboumiComponent::handle_message(const Stanza& stanza)
             kickable_error = false;
         }
       if (kickable_error)
-        bridge->shutdown("Error from remote client");
+        bridge->remove_resource(from.resource, "Error from remote client");
     }
   else if (type == "chat")
     {
@@ -268,10 +269,10 @@ void BiboumiComponent::handle_message(const Stanza& stanza)
 
     }
   else if (iid.type == Iid::Type::User)
-    this->send_invalid_user_error(to.local, from);
+    this->send_invalid_user_error(to.local, from_str);
   } catch (const IRCNotConnected& ex)
     {
-      this->send_stanza_error("message", from, to_str, id,
+      this->send_stanza_error("message", from_str, to_str, id,
                               "cancel", "remote-server-not-found",
                               "Not connected to IRC server "s + ex.hostname,
                               true);