From 8e6ddadba20135d990046f05d1a5d2b64b019138 Mon Sep 17 00:00:00 2001
From: ldruschk <14059613+ldruschk@users.noreply.github.com>
Date: Sat, 18 Apr 2020 22:00:35 +0200
Subject: Relay Joins/Topic changes in RocketChat bridge (#1085)

This pull request properly sets the events EventJoinLeave and EventTopicChange for messages from the RocketChat bridge and drops messages which are neither one of those events nor plain messages.
---
 bridge/rocketchat/handlers.go   | 25 ++++++++++++++++++++++++-
 bridge/rocketchat/rocketchat.go |  6 ++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/bridge/rocketchat/handlers.go b/bridge/rocketchat/handlers.go
index a41004d4..80adb31e 100644
--- a/bridge/rocketchat/handlers.go
+++ b/bridge/rocketchat/handlers.go
@@ -2,6 +2,7 @@ package brocketchat
 
 import (
 	"github.com/42wim/matterbridge/bridge/config"
+	"github.com/matterbridge/Rocket.Chat.Go.SDK/models"
 )
 
 func (b *Brocketchat) handleRocket() {
@@ -38,6 +39,23 @@ func (b *Brocketchat) handleRocketHook(messages chan *config.Message) {
 	}
 }
 
+func (b *Brocketchat) handleStatusEvent(ev models.Message, rmsg *config.Message) bool {
+	switch ev.Type {
+	case "":
+		// this is a normal message, no processing needed
+		// return true so the message is not dropped
+		return true
+	case sUserJoined, sUserLeft:
+		rmsg.Event = config.EventJoinLeave
+		return true
+	case sRoomChangedTopic:
+		rmsg.Event = config.EventTopicChange
+		return true
+	}
+	b.Log.Debugf("Dropping message with unknown type: %s", ev.Type)
+	return false
+}
+
 func (b *Brocketchat) handleRocketClient(messages chan *config.Message) {
 	for message := range b.messageChan {
 		// skip messages with same ID, apparently messages get duplicated for an unknown reason
@@ -59,7 +77,12 @@ func (b *Brocketchat) handleRocketClient(messages chan *config.Message) {
 			UserID:   message.User.ID,
 			ID:       message.ID,
 		}
-		messages <- rmsg
+
+		// handleStatusEvent returns false if the message should be dropped
+		// in that case it is probably some modification to the channel we do not want to relay
+		if b.handleStatusEvent(m, rmsg) {
+			messages <- rmsg
+		}
 	}
 }
 
diff --git a/bridge/rocketchat/rocketchat.go b/bridge/rocketchat/rocketchat.go
index 59f0e99c..405beadc 100644
--- a/bridge/rocketchat/rocketchat.go
+++ b/bridge/rocketchat/rocketchat.go
@@ -29,6 +29,12 @@ type Brocketchat struct {
 	sync.RWMutex
 }
 
+const (
+	sUserJoined       = "uj"
+	sUserLeft         = "ul"
+	sRoomChangedTopic = "room_changed_topic"
+)
+
 func New(cfg *bridge.Config) bridge.Bridger {
 	newCache, err := lru.New(100)
 	if err != nil {
-- 
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