Add a Persistent option on channels

fix #3230

database/database.xml

@@ -46,6 +46,8 @@
 
         <field name="maxHistoryLength" type="integer" default="20"/>
 
+        <field name="persistent" type="boolean" default="false"/>
+
         <index unique="true">
             <indexfield name="owner"/>
             <indexfield name="server"/>

doc/biboumi.1.rst

@@ -564,6 +564,13 @@ On a channel JID (e.g on the JID #test%chat.freenode.org@biboumi.example.com)
     * In encoding: see the option with the same name in the server configuration
       form.
     * Out encoding: Currently ignored.
+    * Persistent: If set to true, biboumi will stay in this channel even when
+      all the XMPP resources have left the room. I.e. it will not send a PART
+      command, and will stay idle in the channel until the connection is
+      forcibly closed. If a resource comes back in the room again, and if
+      the archiving of messages is enabled for this room, the client will
+      receive the messages that where sent in this channel. This option can be
+      used to make biboumi act as an IRC bouncer.
 
 Raw IRC messages
 ----------------

src/bridge/bridge.cpp

@@ -62,7 +62,7 @@ void Bridge::shutdown(const std::string& exit_message)
   for (auto it = this->irc_clients.begin(); it != this->irc_clients.end(); ++it)
   {
     it->second->send_quit_command(exit_message);
-    it->second->leave_dummy_channel(exit_message);
+    it->second->leave_dummy_channel(exit_message, {});
   }
 }
 
@@ -422,33 +422,48 @@ void Bridge::leave_irc_channel(Iid&& iid, const std::string& status_message, con
   if (!this->is_resource_in_chan(key, resource))
     return ;
 
+  IrcChannel* channel = irc->get_channel(iid.get_local());
+  auto nick = channel->get_self()->nick;
+
   const auto resources = this->number_of_resources_in_chan(key);
   if (resources == 1)
     {
       // Do not send a PART message if we actually are not in that channel
       // or if we already sent a PART but we are just waiting for the
       // acknowledgment from the server
-      IrcChannel* channel = irc->get_channel(iid.get_local());
+      bool persistent = false;
-      if (channel->joined && !channel->parting)
+#ifdef USE_DATABASE
+      const auto coptions = Database::get_irc_channel_options_with_server_default(this->user_jid,
+                                                                                  iid.get_server(), iid.get_local());
+      persistent = coptions.persistent.value();
+#endif
+      if (channel->joined && !channel->parting && !persistent)
+        {
+          const auto chan_name = iid.get_local();
+          if (chan_name.empty())
+            irc->leave_dummy_channel(status_message, resource);
+          else
             irc->send_part_command(iid.get_local(), status_message);
+        }
+      else
+        {
+          this->send_muc_leave(std::move(iid), std::move(nick), "", true, resource);
+        }
       // Since there are no resources left in that channel, we don't
       // want to receive private messages using this room's JID
       this->remove_all_preferred_from_jid_of_room(iid.get_local());
     }
   else
     {
-      IrcChannel* chan = irc->get_channel(iid.get_local());
+      if (channel)
-      if (chan)
-        {
-          auto nick = chan->get_self()->nick;
-          this->remove_resource_from_chan(key, resource);
         this->send_muc_leave(std::move(iid), std::move(nick),
                              "Biboumi note: "s + std::to_string(resources - 1) + " resources are still in this channel.",
                              true, resource);
+      this->remove_resource_from_chan(key, resource);
       if (this->number_of_channels_the_resource_is_in(iid.get_server(), resource) == 0)
         this->remove_resource_from_server(iid.get_server(), resource);
     }
-    }
+
 }
 
 void Bridge::send_irc_nick_change(const Iid& iid, const std::string& new_nick, const std::string& requesting_resource)
@@ -862,9 +877,13 @@ void Bridge::send_muc_leave(Iid&& iid, std::string&& nick, const std::string& me
     this->xmpp.send_muc_leave(std::to_string(iid), std::move(nick), this->make_xmpp_body(message),
                               this->user_jid + "/" + resource, self);
   else
+    {
       for (const auto &res: this->resources_in_chan[iid.to_tuple()])
         this->xmpp.send_muc_leave(std::to_string(iid), std::move(nick), this->make_xmpp_body(message),
                                   this->user_jid + "/" + res, self);
+      this->remove_all_resources_from_chan(iid.to_tuple());
+
+    }
   IrcClient* irc = this->find_irc_client(iid.get_server());
   if (irc && irc->number_of_joined_channels() == 0)
     this->quit_or_start_linger_timer(iid.get_server());
@@ -1137,6 +1156,11 @@ bool Bridge::is_resource_in_chan(const Bridge::ChannelKey& channel, const std::s
   return false;
 }
 
+void Bridge::remove_all_resources_from_chan(const Bridge::ChannelKey& channel_key)
+{
+  this->resources_in_chan.erase(channel_key);
+}
+
 void Bridge::add_resource_to_server(const Bridge::IrcHostname& irc_hostname, const std::string& resource)
 {
   auto it = this->resources_in_server.find(irc_hostname);

src/bridge/bridge.hpp

@@ -312,6 +312,7 @@ private:
   void add_resource_to_chan(const ChannelKey& channel_key, const std::string& resource);
   void remove_resource_from_chan(const ChannelKey& channel_key, const std::string& resource);
   bool is_resource_in_chan(const ChannelKey& channel_key, const std::string& resource) const;
+  void remove_all_resources_from_chan(const ChannelKey& channel_key);
   std::size_t number_of_resources_in_chan(const ChannelKey& channel_key) const;
 
   void add_resource_to_server(const IrcHostname& irc_hostname, const std::string& resource);

src/irc/irc_client.cpp

@@ -501,15 +501,7 @@ void IrcClient::send_private_message(const std::string& username, const std::str
 
 void IrcClient::send_part_command(const std::string& chan_name, const std::string& status_message)
 {
-  IrcChannel* channel = this->get_channel(chan_name);
-  if (channel->joined == true)
-    {
-      if (chan_name.empty())
-        this->leave_dummy_channel(status_message);
-      else
   this->send_message(IrcMessage("PART", {chan_name, status_message}));
-      channel->parting = true;
-    }
 }
 
 void IrcClient::send_mode_command(const std::string& chan_name, const std::vector<std::string>& arguments)
@@ -1160,14 +1152,14 @@ DummyIrcChannel& IrcClient::get_dummy_channel()
   return this->dummy_channel;
 }
 
-void IrcClient::leave_dummy_channel(const std::string& exit_message)
+void IrcClient::leave_dummy_channel(const std::string& exit_message, const std::string& resource)
 {
   if (!this->dummy_channel.joined)
     return;
   this->dummy_channel.joined = false;
   this->dummy_channel.joining = false;
   this->dummy_channel.remove_all_users();
-  this->bridge.send_muc_leave(Iid("%"s + this->hostname, this->chantypes), std::string(this->current_nick), exit_message, true);
+  this->bridge.send_muc_leave(Iid("%"s + this->hostname, this->chantypes), std::string(this->current_nick), exit_message, true, resource);
 }
 
 #ifdef BOTAN_FOUND

src/irc/irc_client.hpp

@@ -283,7 +283,7 @@ public:
    * Leave the dummy channel: forward a message to the user to indicate that
    * he left it, and mark it as not joined.
    */
-  void leave_dummy_channel(const std::string& exit_message);
+  void leave_dummy_channel(const std::string& exit_message, const std::string& resource);
 
   const std::string& get_hostname() const { return this->hostname; }
   std::string get_nick() const { return this->current_nick; }

src/xmpp/biboumi_adhoc_commands.cpp

@@ -256,7 +256,8 @@ void ConfigureIrcServerStep1(XmppComponent&, AdhocSession& session, XmlNode& com
   XmlSubNode pass(x, "field");
   pass["var"] = "pass";
   pass["type"] = "text-private";
-  pass["label"] = "Server password (to be used in a PASS command when connecting)";
+  pass["label"] = "Server password";
+  pass["desc"] = "Will be used in a PASS command when connecting";
   if (!options.pass.value().empty())
     {
       XmlSubNode pass_value(pass, "value");
@@ -463,6 +464,20 @@ void ConfigureIrcChannelStep1(XmppComponent&, AdhocSession& session, XmlNode& co
       XmlSubNode encoding_in_value(encoding_in, "value");
       encoding_in_value.set_inner(options.encodingIn.value());
     }
+
+  XmlSubNode persistent(x, "field");
+  persistent["var"] = "persistent";
+  persistent["type"] = "boolean";
+  persistent["desc"] = "If set to true, when all XMPP clients have left this channel, biboumi will stay idle in it, without sending a PART command.";
+  persistent["label"] = "Persistent";
+  {
+    XmlSubNode value(persistent, "value");
+    value.set_name("value");
+    if (options.persistent.value())
+      value.set_inner("true");
+    else
+      value.set_inner("false");
+  }
 }
 
 void ConfigureIrcChannelStep2(XmppComponent&, AdhocSession& session, XmlNode& command_node)
@@ -486,6 +501,10 @@ void ConfigureIrcChannelStep2(XmppComponent&, AdhocSession& session, XmlNode& co
           else if (field->get_tag("var") == "encoding_in" &&
                    value && !value->get_inner().empty())
             options.encodingIn = value->get_inner();
+
+          else if (field->get_tag("var") == "persistent" &&
+                   value)
+            options.persistent = to_bool(value->get_inner());
         }
 
       options.update();