From e5989adf92cd5ea007b5e7d50580579f8581fee2 Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Tue, 6 Mar 2018 21:34:55 +0100
Subject: Add support for NoSendJoinPart. Closes #382

---
 bridge/config/config.go         |  1 +
 bridge/irc/irc.go               |  3 +++
 bridge/mattermost/mattermost.go |  3 +++
 bridge/slack/slack.go           |  4 ++++
 matterbridge.toml.sample        | 15 +++++++++++++++
 5 files changed, 26 insertions(+)

diff --git a/bridge/config/config.go b/bridge/config/config.go
index 42a87f1c..831ea575 100644
--- a/bridge/config/config.go
+++ b/bridge/config/config.go
@@ -87,6 +87,7 @@ type Protocol struct {
 	NickServPassword       string     // IRC
 	NicksPerRow            int        // mattermost, slack
 	NoHomeServerSuffix     bool       // matrix
+	NoSendJoinPart         bool       // all protocols
 	NoTLS                  bool       // mattermost
 	Password               string     // IRC,mattermost,XMPP,matrix
 	PrefixMessagesWithNick bool       // mattemost, slack
diff --git a/bridge/irc/irc.go b/bridge/irc/irc.go
index df1b7df7..ccaf0276 100644
--- a/bridge/irc/irc.go
+++ b/bridge/irc/irc.go
@@ -302,6 +302,9 @@ func (b *Birc) handleJoinPart(client *girc.Client, event girc.Event) {
 		}
 	}
 	if event.Source.Name != b.Nick {
+		if b.GetBool("nosendjoinpart") {
+			return
+		}
 		b.Log.Debugf("<= Sending JOIN_LEAVE event from %s to gateway", b.Account)
 		msg := config.Message{Username: "system", Text: event.Source.Name + " " + strings.ToLower(event.Command) + "s", Channel: channel, Account: b.Account, Event: config.EVENT_JOIN_LEAVE}
 		b.Log.Debugf("<= Message is %#v", msg)
diff --git a/bridge/mattermost/mattermost.go b/bridge/mattermost/mattermost.go
index 334bb093..7a3806ab 100644
--- a/bridge/mattermost/mattermost.go
+++ b/bridge/mattermost/mattermost.go
@@ -400,6 +400,9 @@ func (b *Bmattermost) skipMessage(message *matterclient.Message) bool {
 	if message.Type == "system_join_leave" ||
 		message.Type == "system_join_channel" ||
 		message.Type == "system_leave_channel" {
+		if b.GetBool("nosendjoinpart") {
+			return true
+		}
 		b.Log.Debugf("Sending JOIN_LEAVE event from %s to gateway", b.Account)
 		b.Remote <- config.Message{Username: "system", Text: message.Text, Channel: message.Channel, Account: b.Account, Event: config.EVENT_JOIN_LEAVE}
 		return true
diff --git a/bridge/slack/slack.go b/bridge/slack/slack.go
index a42c7e78..7912988e 100644
--- a/bridge/slack/slack.go
+++ b/bridge/slack/slack.go
@@ -619,6 +619,10 @@ func (b *Bslack) sendWebhook(msg config.Message) (string, error) {
 
 // skipMessageEvent skips event that need to be skipped :-)
 func (b *Bslack) skipMessageEvent(ev *slack.MessageEvent) bool {
+	if ev.SubType == "channel_leave" || ev.SubType == "channel_join" {
+		return b.GetBool("nosendjoinpart")
+	}
+
 	// ignore pinned items
 	if ev.SubType == "pinned_item" || ev.SubType == "unpinned_item" {
 		return true
diff --git a/matterbridge.toml.sample b/matterbridge.toml.sample
index 2f4d470e..0e74f7e8 100644
--- a/matterbridge.toml.sample
+++ b/matterbridge.toml.sample
@@ -135,6 +135,11 @@ RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 #OPTIONAL (default false)
 ShowJoinPart=false
 
+#Do not send joins/parts to other bridges
+#Currently works for messages from the following bridges: irc, mattermost, slack
+#OPTIONAL (default false)
+NoSendJoinPart=false
+
 #StripNick only allows alphanumerical nicks. See https://github.com/42wim/matterbridge/issues/285
 #It will strip other characters from the nick
 #OPTIONAL (default false)
@@ -446,6 +451,11 @@ RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 #OPTIONAL (default false)
 ShowJoinPart=false
 
+#Do not send joins/parts to other bridges
+#Currently works for messages from the following bridges: irc, mattermost, slack
+#OPTIONAL (default false)
+NoSendJoinPart=false
+
 #StripNick only allows alphanumerical nicks. See https://github.com/42wim/matterbridge/issues/285
 #It will strip other characters from the nick
 #OPTIONAL (default false)
@@ -636,6 +646,11 @@ RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 #OPTIONAL (default false)
 ShowJoinPart=false
 
+#Do not send joins/parts to other bridges
+#Currently works for messages from the following bridges: irc, mattermost, slack
+#OPTIONAL (default false)
+NoSendJoinPart=false
+
 #StripNick only allows alphanumerical nicks. See https://github.com/42wim/matterbridge/issues/285
 #It will strip other characters from the nick
 #OPTIONAL (default false)
-- 
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