Include a private and no-copy nodes in private <message/> to avoid carbon duplication

louloulibs/xmpp/xmpp_component.cpp

@@ -273,7 +273,8 @@ void* XmppComponent::get_receive_buffer(const size_t size) const
   return this->parser.get_buffer(size);
 }
 
-void XmppComponent::send_message(const std::string& from, Xmpp::body&& body, const std::string& to, const std::string& type, const bool fulljid)
+void XmppComponent::send_message(const std::string& from, Xmpp::body&& body, const std::string& to,
+                                 const std::string& type, const bool fulljid, const bool nocopy)
 {
   XmlNode node("message");
   node["to"] = to;
@@ -294,6 +295,18 @@ void XmppComponent::send_message(const std::string& from, Xmpp::body&& body, con
       html.add_child(std::move(std::get<1>(body)));
       node.add_child(std::move(html));
     }
+
+  if (nocopy)
+    {
+      XmlNode private_node("private");
+      private_node["xmlns"] = "urn:xmpp:carbons:2";
+      node.add_child(std::move(private_node));
+
+      XmlNode nocopy("no-copy");
+      nocopy["xmlns"] = "urn:xmpp:hints";
+      node.add_child(std::move(nocopy));
+    }
+
   this->send_stanza(node);
 }
 

louloulibs/xmpp/xmpp_component.hpp

@@ -109,9 +109,8 @@ public:
    * If fulljid is false, the provided 'from' doesn't contain the
    * server-part of the JID and must be added.
    */
-  void send_message(const std::string& from, Xmpp::body&& body,
-                    const std::string& to, const std::string& type,
-                    const bool fulljid=false);
+  void send_message(const std::string& from, Xmpp::body&& body, const std::string& to,
+                    const std::string& type, const bool fulljid, const bool nocopy=false);
   /**
    * Send a join from a new participant
    */

src/bridge/bridge.cpp

@@ -771,13 +771,13 @@ void Bridge::send_message(const Iid& iid, const std::string& nick, const std::st
           const auto chan_name = Iid(Jid(it->second).local, {}).get_local();
           for (const auto& resource: this->resources_in_chan[ChannelKey{chan_name, iid.get_server()}])
             this->xmpp.send_message(it->second, this->make_xmpp_body(body, encoding),
-                                    this->user_jid + "/" + resource, "chat", true);
+                                    this->user_jid + "/" + resource, "chat", true, true);
         }
       else
         {
           for (const auto& resource: this->resources_in_server[iid.get_server()])
             this->xmpp.send_message(std::to_string(iid), this->make_xmpp_body(body, encoding),
-                                    this->user_jid + "/" + resource, "chat", false);
+                                    this->user_jid + "/" + resource, "chat", false, true);
         }
     }
 }
@@ -835,7 +835,7 @@ void Bridge::send_xmpp_message(const std::string& from, const std::string& autho
   const auto encoding = in_encoding_for(*this, {from, this});
   for (const auto& resource: this->resources_in_server[from])
     {
-        this->xmpp.send_message(from, this->make_xmpp_body(body, encoding), this->user_jid + "/" + resource, "chat");
+      this->xmpp.send_message(from, this->make_xmpp_body(body, encoding), this->user_jid + "/" + resource, "chat", false, false);
     }
 }