Implement sending of EventJoinLeave both to and from Mumble (#1915)

* mumble: Implement sending of EventJoinLeave both to and from Mumble (Closes #1435)

* mumble: Break handleUserChange into two functions

3 files changed, 85 insertions, 20 deletions

diff --git a/bridge/mumble/handlers.go b/bridge/mumble/handlers.go
index 40272633..8120159a 100644
--- a/bridge/mumble/handlers.go
+++ b/bridge/mumble/handlers.go
@@ -78,19 +78,75 @@ func (b *Bmumble) handleConnect(event *gumble.ConnectEvent) {
 	}
 }
 
-func (b *Bmumble) handleUserChange(event *gumble.UserChangeEvent) {
-	// Only care about changes to self
-	if event.User != event.Client.Self {
+func (b *Bmumble) handleJoinLeave(event *gumble.UserChangeEvent) {
+	// Ignore events happening before setup is done
+	if b.Channel == nil {
 		return
 	}
-	// Someone attempted to move the user out of the configured channel; attempt to join back
-	if b.Channel != nil {
+	if b.GetBool("nosendjoinpart") {
+		return
+	}
+	b.Log.Debugf("Received gumble user change event: %+v", event)
+
+	text := ""
+	switch {
+	case event.Type&gumble.UserChangeKicked > 0:
+		text = " was kicked"
+	case event.Type&gumble.UserChangeBanned > 0:
+		text = " was banned"
+	case event.Type&gumble.UserChangeDisconnected > 0:
+		if event.User.Channel != nil && event.User.Channel.ID == *b.Channel {
+			text = " left"
+		}
+	case event.Type&gumble.UserChangeConnected > 0:
+		if event.User.Channel != nil && event.User.Channel.ID == *b.Channel {
+			text = " joined"
+		}
+	case event.Type&gumble.UserChangeChannel > 0:
+		// Treat Mumble channel changes the same as connects/disconnects; as far as matterbridge is concerned, they are identical
+		if event.User.Channel != nil && event.User.Channel.ID == *b.Channel {
+			text = " joined"
+		} else {
+			text = " left"
+		}
+	}
+
+	if text != "" {
+		b.Remote <- config.Message{
+			Username: "system",
+			Text:     event.User.Name + text,
+			Channel:  strconv.FormatUint(uint64(*b.Channel), 10),
+			Account:  b.Account,
+			Event:    config.EventJoinLeave,
+		}
+	}
+}
+
+func (b *Bmumble) handleUserModified(event *gumble.UserChangeEvent) {
+	// Ignore events happening before setup is done
+	if b.Channel == nil {
+		return
+	}
+
+	if event.Type&gumble.UserChangeChannel > 0 {
+		// Someone attempted to move the user out of the configured channel; attempt to join back
 		if err := b.doJoin(event.Client, *b.Channel); err != nil {
 			b.Log.Error(err)
 		}
 	}
 }
 
+func (b *Bmumble) handleUserChange(event *gumble.UserChangeEvent) {
+	// The UserChangeEvent is used for both the gumble client itself as well as other clients
+	if event.User != event.Client.Self {
+		// other users
+		b.handleJoinLeave(event)
+	} else {
+		// gumble user
+		b.handleUserModified(event)
+	}
+}
+
 func (b *Bmumble) handleDisconnect(event *gumble.DisconnectEvent) {
 	b.connected <- *event
 }
diff --git a/bridge/mumble/mumble.go b/bridge/mumble/mumble.go
index 1943bd39..945cf559 100644
--- a/bridge/mumble/mumble.go
+++ b/bridge/mumble/mumble.go
@@ -93,7 +93,7 @@ func (b *Bmumble) JoinChannel(channel config.ChannelInfo) error {
 func (b *Bmumble) Send(msg config.Message) (string, error) {
 	// Only process text messages
 	b.Log.Debugf("=> Received local message %#v", msg)
-	if msg.Event != "" && msg.Event != config.EventUserAction {
+	if msg.Event != "" && msg.Event != config.EventUserAction && msg.Event != config.EventJoinLeave {
 		return "", nil
 	}
 
diff --git a/matterbridge.toml.sample b/matterbridge.toml.sample
index 20800689..96104501 100644
--- a/matterbridge.toml.sample
+++ b/matterbridge.toml.sample
@@ -188,7 +188,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -198,7 +198,7 @@ ShowJoinPart=false
 VerboseJoinPart=false
 
 #Do not send joins/parts to other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 NoSendJoinPart=false
 
@@ -325,7 +325,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -492,12 +492,12 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
 #Do not send joins/parts to other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 NoSendJoinPart=false
 
@@ -579,7 +579,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -687,7 +687,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -826,12 +826,12 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
 #Do not send joins/parts to other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 NoSendJoinPart=false
 
@@ -1138,7 +1138,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -1275,7 +1275,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -1387,7 +1387,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -1484,7 +1484,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false
 
@@ -1572,6 +1572,15 @@ SkipTLSVerify=false
 #Default "<clipped message>"
 MessageClipped="<clipped message>"
 
+#Enable to show users joins/parts from other bridges
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
+#OPTIONAL (default false)
+ShowJoinPart=false
+
+#Do not send joins/parts to other bridges
+#OPTIONAL (default false)
+NoSendJoinPart=false
+
 ###################################################################
 #VK
 ###################################################################
@@ -1684,7 +1693,7 @@ Label=""
 RemoteNickFormat="[{PROTOCOL}] <{NICK}> "
 
 #Enable to show users joins/parts from other bridges
-#Currently works for messages from the following bridges: irc, mattermost, slack, discord
+#Currently works for messages from the following bridges: irc, mattermost, mumble, slack, discord
 #OPTIONAL (default false)
 ShowJoinPart=false