Add XEP-0106 support to the bridge

This allows the user to join channels containing forbidden characters
in the local part, like #r&d or #group/project.

src/bridge/bridge.cpp

@@ -685,7 +685,10 @@ void Bridge::send_user_join(const std::string& hostname, const std::string& chan
   std::string role;
   std::tie(role, affiliation) = get_role_affiliation_from_irc_mode(user_mode);
 
-  this->xmpp.send_user_join(chan_name + utils::empty_if_fixed_server("%" + hostname), user->nick, user->host,
+  std::string encoded_chan_name(chan_name);
+  xep0106::encode(encoded_chan_name);
+
+  this->xmpp.send_user_join(encoded_chan_name + utils::empty_if_fixed_server("%" + hostname), user->nick, user->host,
                             affiliation, role, this->user_jid + "/" + resource, self);
 }
 
@@ -701,8 +704,10 @@ void Bridge::send_topic(const std::string& hostname, const std::string& chan_nam
                         const std::string& topic, const std::string& who,
                         const std::string& resource)
 {
-  const auto encoding = in_encoding_for(*this, {chan_name + '%' + hostname});
-  this->xmpp.send_topic(chan_name + utils::empty_if_fixed_server(
+  std::string encoded_chan_name(chan_name);
+  xep0106::encode(encoded_chan_name);
+  const auto encoding = in_encoding_for(*this, {encoded_chan_name + '%' + hostname});
+  this->xmpp.send_topic(encoded_chan_name + utils::empty_if_fixed_server(
       "%" + hostname), this->make_xmpp_body(topic, encoding), this->user_jid + "/" + resource, who);
 
 }
@@ -884,13 +889,13 @@ void Bridge::generate_channel_join_for_resource(const Iid& iid, const std::strin
       if (user->nick != self->nick)
         {
           log_debug(user->nick);
-          this->send_user_join(iid.get_server(), iid.get_local(),
+          this->send_user_join(iid.get_server(), iid.get_encoded_local(),
                                user.get(), user->get_most_significant_mode(irc->get_sorted_user_modes()),
                                false, resource);
         }
     }
-  this->send_user_join(iid.get_server(), iid.get_local(),
+  this->send_user_join(iid.get_server(), iid.get_encoded_local(),
                        self, self->get_most_significant_mode(irc->get_sorted_user_modes()),
                        true, resource);
-  this->send_topic(iid.get_server(), iid.get_local(), channel->topic, channel->topic_author, resource);
+  this->send_topic(iid.get_server(), iid.get_encoded_local(), channel->topic, channel->topic_author, resource);
 }

src/irc/iid.cpp

@@ -3,6 +3,8 @@
 
 #include <irc/iid.hpp>
 
+#include <utils/encoding.hpp>
+
 Iid::Iid(const std::string& iid):
   is_channel(false),
   is_user(false)
@@ -59,7 +61,9 @@ Iid::Iid():
 
 void Iid::set_local(const std::string& loc)
 {
-  this->local = utils::tolower(loc);
+  std::string local(utils::tolower(loc));
+  xep0106::decode(local);
+  this->local = local;
 }
 
 void Iid::set_server(const std::string& serv)
@@ -72,6 +76,13 @@ const std::string& Iid::get_local() const
   return this->local;
 }
 
+const std::string Iid::get_encoded_local() const
+{
+  std::string local(this->local);
+  xep0106::encode(local);
+  return local;
+}
+
 const std::string& Iid::get_server() const
 {
   return this->server;
@@ -90,13 +101,13 @@ namespace std {
   const std::string to_string(const Iid& iid)
   {
     if (Config::get("fixed_irc_server", "").empty())
-      return iid.get_local() + iid.get_sep() + iid.get_server();
+      return iid.get_encoded_local() + iid.get_sep() + iid.get_server();
     else
       {
         if (iid.get_sep() == "!")
-          return iid.get_local() + iid.get_sep();
+          return iid.get_encoded_local() + iid.get_sep();
         else
-          return iid.get_local();
+          return iid.get_encoded_local();
       }
   }
 }

src/irc/iid.hpp

@@ -53,6 +53,7 @@ public:
   void set_local(const std::string& loc);
   void set_server(const std::string& serv);
   const std::string& get_local() const;
+  const std::string get_encoded_local() const;
   const std::string& get_server() const;
 
   bool is_channel;