jabber: Workaround for servers (like slack) that send echoes without id

Just comparing the body of the last sent message. This isn't foolproof
and sending several messages quickly can make it fail, but it's less
annoying than before. The correct solution is still to fix the server.

In the case of slack I still recommend using the irc gateway instead.

1 files changed, 14 insertions, 4 deletions

diff --git a/protocols/jabber/conference.c b/protocols/jabber/conference.c
index 593e4233..75f3100c 100644
--- a/protocols/jabber/conference.c
+++ b/protocols/jabber/conference.c
@@ -166,6 +166,7 @@ void jabber_chat_free(struct groupchat *c)
 
 	jabber_buddy_remove_bare(c->ic, jc->name);
 
+	g_free(jc->last_sent_message);
 	g_free(jc->my_full_jid);
 	g_free(jc->name);
 	g_free(jc->invite);
@@ -187,6 +188,9 @@ int jabber_chat_msg(struct groupchat *c, char *message, int flags)
 
 	jabber_cache_add(ic, node, jabber_chat_self_message);
 
+	g_free(jc->last_sent_message);
+	jc->last_sent_message = g_strdup(message);
+
 	return !jabber_write_packet(ic, node);
 }
 
@@ -493,10 +497,16 @@ void jabber_chat_pkt_message(struct im_connection *ic, struct jabber_buddy *bud,
 	} else if (chat != NULL && bud == NULL && nick == NULL) {
 		imcb_chat_log(chat, "From conference server: %s", body->text);
 		return;
-	} else if (jc && jc->flags & JCFLAG_MESSAGE_SENT && bud == jc->me &&
-		   (jabber_cache_handle_packet(ic, node) == XT_ABORT)) {
-		/* Self message marked by this bitlbee, don't show it */
-		return;
+	} else if (jc && jc->flags & JCFLAG_MESSAGE_SENT && bud == jc->me) {
+		if (jabber_cache_handle_packet(ic, node) == XT_ABORT) {
+			/* Self message marked by this bitlbee, don't show it */
+			return;
+		} else if (xt_find_attr(node, "id") == NULL &&
+		           g_strcmp0(body->text, jc->last_sent_message) == 0) {
+			/* Some misbehaving servers (like slack) eat the ids and echo anyway.
+			 * Try to detect those cases by comparing against the last sent message. */
+			return;
+		}
 	}
 
 	if (bud) {