When joining a channel, send the most recent history found in the database

louloulibs/xmpp/xmpp_component.cpp

@@ -16,6 +16,9 @@
 
 #include <uuid.h>
 
+#include <cstdlib>
+#include <iomanip>
+
 #include <louloulibs.h>
 #ifdef SYSTEMD_FOUND
 # include <systemd/sd-daemon.h>
@@ -426,6 +429,31 @@ void XmppComponent::send_muc_message(const std::string& muc_name, const std::str
   this->send_stanza(message);
 }
 
+void XmppComponent::send_history_message(const std::string& muc_name, const std::string& nick, const std::string& body_txt, const std::string& jid_to, std::time_t timestamp)
+{
+  Stanza message("message");
+  message["to"] = jid_to;
+  if (!nick.empty())
+    message["from"] = muc_name + "@" + this->served_hostname + "/" + nick;
+  else
+    message["from"] = muc_name + "@" + this->served_hostname;
+  message["type"] = "groupchat";
+
+  XmlNode body("body");
+  body.set_inner(body_txt);
+  message.add_child(std::move(body));
+
+  XmlNode delay("delay");
+  delay["xmlns"] = "urn:xmpp:delay";
+  delay["from"] = muc_name + "@" + this->served_hostname;
+  std::stringstream date_ss;
+  date_ss << std::put_time(std::gmtime(&timestamp), "%FT%Tz") << std::endl;
+  delay["stamp"] = date_ss.str();
+
+  message.add_child(std::move(delay));
+  this->send_stanza(message);
+}
+
 void XmppComponent::send_muc_leave(const std::string& muc_name, std::string&& nick, Xmpp::body&& message, const std::string& jid_to, const bool self)
 {
   Stanza presence("presence");

louloulibs/xmpp/xmpp_component.hpp

@@ -134,6 +134,11 @@ public:
    * Send a (non-private) message to the MUC
    */
   void send_muc_message(const std::string& muc_name, const std::string& nick, Xmpp::body&& body, const std::string& jid_to);
+  /**
+   * Send a message, with a <delay/> element, part of a MUC history
+   */
+  void send_history_message(const std::string& muc_name, const std::string& nick, const std::string& body,
+                            const std::string& jid_to, const std::time_t timestamp);
   /**
    * Send an unavailable presence for this nick
    */