From bd74021ca61b4b73c864a500f100ca5f44014522 Mon Sep 17 00:00:00 2001
From: moyamo <moyamodehacker@gmail.com>
Date: Fri, 27 Nov 2015 22:01:16 +0200
Subject: [PATCH] Typing \leave in a MUC will leave the group chat

---
 bot.py           |  5 ++++-
 session.py       | 46 +++++++++++++++++++++++++++++++++++++---------
 yowsupwrapper.py | 11 +++++++++++
 3 files changed, 52 insertions(+), 10 deletions(-)

diff --git a/bot.py b/bot.py
index 0515f5b..f6a39ba 100644
--- a/bot.py
+++ b/bot.py
@@ -179,7 +179,10 @@ class Bot():
 \\getgroups		get current groups from WA
 
 following user commands are available:
-\\lastseen			request last online timestamp from buddy""")
+\\lastseen			request last online timestamp from buddy
+
+following group commands are available
+\\leave				permanently leave group chat""")
 
 	def _fortune(self, database = '', prefix=''):
 		if os.path.exists("/usr/share/fortune/%s" % database):
diff --git a/session.py b/session.py
index 7f54f71..78e9985 100644
--- a/session.py
+++ b/session.py
@@ -564,15 +564,19 @@ class Session(YowsupApp):
 				self.msgIDs[waId] = MsgIDs( ID, waId)
 			else:
 				room = sender
-				try:
-					group = self.groups[self._lengthenGroupId(room)]
-					self.logger.info("Group Message from %s to %s Groups: %s",
-									 group.nick , group , self.groups)
-					self.backend.handleMessage(
-						self.user, room, message.decode('utf-8'), group.nick
-					)
-				except KeyError:
-					self.logger.error('Group not found: %s', room)
+				if message[0] == '\\' and message[:1] != '\\\\':
+					self.logger.debug("Executing command %s in %s", message, room)
+					self.executeCommand(message, room)
+				else:
+					try:
+						group = self.groups[self._lengthenGroupId(room)]
+						self.logger.debug("Group Message from %s to %s Groups: %s",
+										 group.nick , group , self.groups)
+						self.backend.handleMessage(
+							self.user, room, message.decode('utf-8'), group.nick
+						)
+					except KeyError:
+						self.logger.error('Group not found: %s', room)
 				
 				if (".jpg" in message.lower()) or (".webp" in message.lower()):
                                         if (".jpg" in message.lower()):
@@ -629,6 +633,30 @@ class Session(YowsupApp):
 
                                         self.logger.info("WA Message send to %s with ID %s", buddy, waId)
 			#self.sendTextMessage(sender + '@s.whatsapp.net', message)
+	
+	def executeCommand(self, command, room):
+		if command == '\\leave':
+			self.logger.debug("Leaving room %s", room)
+			# Leave group on whatsapp side
+			self.leaveGroup(room)
+			# Delete Room on spectrum side
+			group = self.groups[room]
+			for jid in group.participants:
+				buddy = jid.split("@")[0]
+				self.logger.info("Added %s to room %s", buddy, room)
+				try:
+					nick = self.buddies[buddy].nick
+				except KeyError:
+					nick = buddy
+				if nick == "":
+					nick = buddy
+				if buddy == self.legacyName:
+					nick = group.nick
+				flags = protocol_pb2.PARTICIPANT_FLAG_ROOM_NOT_FOUND
+				self.backend.handleParticipantChanged(
+						self.user, nick, self._shortenGroupId(room), flags,
+						protocol_pb2.STATUS_NONE, buddy)
+			del self.groups[room]
 
 	def _requestLastSeen(self, buddy):
 		
diff --git a/yowsupwrapper.py b/yowsupwrapper.py
index add9b93..4de5be9 100644
--- a/yowsupwrapper.py
+++ b/yowsupwrapper.py
@@ -232,6 +232,16 @@ class YowsupApp(object):
 		entity = UnsubscribePresenceProtocolEntity(jid)
 		self.sendEntity(entity)
 
+	def leaveGroup(self, group):
+		"""
+		Permanently leave a WhatsApp group
+
+		Args:
+			- group: (str) the group id (e.g. 27831788123-144024456)
+		"""
+		entity = LeaveGroupsIqProtocolEntity([group + '@g.us'])
+		self.sendEntity(entity)
+
 	def setStatus(self, statusText):
 		"""
 		Send status to whatsapp
@@ -595,6 +605,7 @@ class YowsupAppLayer(YowInterfaceLayer):
 
 	@ProtocolEntityCallback('message')
 	def onMessageReceived(self, entity):
+		self.logger.debug("Received Message: %s", entity)
 		if entity.getType() == MessageProtocolEntity.MESSAGE_TYPE_TEXT:
 			self.caller.onTextMessage(
 				entity._id,