Support all allowed channel prefixes

RFC 2812 specifies in §1.3 that “Channels names are strings (beginning
with a '&', '#', '+' or '!' character) of length up to fifty (50)
characters.”

We previously only allowed the first two prefix characters, or any other
one if the server overrides the list with ISUPPORT.

src/bridge/bridge.cpp

@@ -1160,7 +1160,7 @@ std::set<char> Bridge::get_chantypes(const std::string& hostname) const
 {
   IrcClient* irc = this->find_irc_client(hostname);
   if (!irc)
-    return {'#', '&'};
+    return {'&', '#', '+', '!'};
   return irc->get_chantypes();
 }
 

src/irc/iid.hpp

@@ -20,7 +20,7 @@ class Bridge;
  * It’s possible to have an empty-string server, but it makes no sense in
  * biboumi’s context.
  *
- * Assuming the chantypes are '#' and '&':
+ * Assuming the chantypes are '&', '#', '+' and '!':
  *
  * #test%irc.example.org has :
  * - local: "#test" (the # is part of the name, it could very well be absent, or & (for example) instead)

src/irc/irc_client.cpp

@@ -155,7 +155,7 @@ IrcClient::IrcClient(std::shared_ptr<Poller>& poller, std::string hostname,
   bridge(bridge),
   welcomed(false),
   chanmodes({"", "", "", ""}),
-  chantypes({'#', '&'}),
+  chantypes({'&', '#', '+', '!'}),
   tokens_bucket(this->get_throttle_limit(), 1s, [this]() {
     if (message_queue.empty())
       return true;

src/xmpp/biboumi_component.cpp

@@ -482,7 +482,7 @@ void BiboumiComponent::handle_iq(const Stanza& stanza)
 
           // Depending on the 'to' jid in the request, we use one adhoc
           // command handler or an other
-          Iid iid(to.local, {'#', '&'});
+          Iid iid(to.local, {'&', '#', '+', '!'});
           AdhocCommandsHandler* adhoc_handler;
           if (to.local.empty())
             adhoc_handler = &this->adhoc_commands_handler;
@@ -532,7 +532,7 @@ void BiboumiComponent::handle_iq(const Stanza& stanza)
       const XmlNode* query;
       if ((query = stanza.get_child("query", DISCO_INFO_NS)))
         { // Disco info
-          Iid iid(to.local, {'#', '&'});
+          Iid iid(to.local, {'&', '#', '+', '!'});
           const std::string node = query->get_tag("node");
           if (to_str == this->served_hostname)
             {
@@ -736,7 +736,7 @@ bool BiboumiComponent::handle_mam_request(const Stanza& stanza)
 
     const XmlNode* query = stanza.get_child("query", MAM_NS);
 
-    Iid iid(to.local, {'#', '&'});
+    Iid iid(to.local, {'&', '#', '+', '!'});
     if (query && iid.type == Iid::Type::Channel && to.resource.empty())
       {
         const std::string query_id = query->get_tag("queryid");
@@ -865,7 +865,7 @@ void BiboumiComponent::send_archived_message(const Database::MucLogLine& log_lin
 
 bool BiboumiComponent::handle_room_configuration_form_request(const std::string& from, const Jid& to, const std::string& id)
 {
-  Iid iid(to.local, {'#', '&'});
+  Iid iid(to.local, {'&', '#', '+', '!'});
 
   if (iid.type != Iid::Type::Channel || !to.resource.empty())
     return false;
@@ -887,7 +887,7 @@ bool BiboumiComponent::handle_room_configuration_form_request(const std::string&
 
 bool BiboumiComponent::handle_room_configuration_form(const XmlNode& query, const std::string &from, const Jid &to, const std::string &id)
 {
-  Iid iid(to.local, {'#', '&'});
+  Iid iid(to.local, {'&', '#', '+', '!'});
 
   if (iid.type != Iid::Type::Channel || !to.resource.empty())
     return false;