Add in leaveDoc end point

services/real-time/app/coffee/Router.coffee

@@ -63,3 +63,12 @@ module.exports = Router =
 					else
 						callback(null, args...)
 						
+			client.on "leaveDoc", (doc_id, callback) ->
+				WebsocketController.leaveDoc client, doc_id, (err, args...) ->
+					if err?
+						Router._getClientData client, (_, client) ->
+							logger.error {err, client, doc_id}, "server side error in leaveDoc"
+						# Don't return raw error to prevent leaking server side info
+						return callback {message: "Something went wrong"}
+					else
+						callback(null, args...)

services/real-time/app/coffee/WebsocketController.coffee

@@ -34,9 +34,8 @@ module.exports = WebsocketController =
 			callback null, project, privilegeLevel, WebsocketController.PROTOCOL_VERSION
 			
 	joinDoc: (client, doc_id, fromVersion = -1, callback = (error, doclines, version, ops) ->) ->
-		client.get "user_id", (error, user_id) ->
-			client.get "project_id", (error, project_id) ->
-				logger.log {user_id, project_id, doc_id, fromVersion, client_id: client.id}, "client joining doc"
+		WebsocketController._getClientData client, (error, {client_id, user_id, project_id}) ->
+			logger.log {user_id, project_id, doc_id, fromVersion, client_id}, "client joining doc"
 					
 		AuthorizationManager.assertClientCanViewProject client, (error) ->
 			return callback(error) if error?
@@ -58,3 +57,15 @@ module.exports = WebsocketController =
 					client.join(doc_id)
 					callback null, escapedLines, version, ops
 					
+	leaveDoc: (client, doc_id, callback = (error) ->) ->
+		WebsocketController._getClientData client, (error, {client_id, user_id, project_id}) ->
+			logger.log {user_id, project_id, doc_id, client_id}, "client leaving doc"
+		client.leave doc_id
+		callback()
+		
+	# Only used in logging.
+	_getClientData: (client, callback = (error, data) ->) ->
+		client.get "user_id", (error, user_id) ->
+			client.get "project_id", (error, project_id) ->
+				callback null, {client_id: client.id, project_id, user_id}
+			

services/real-time/test/unit/coffee/WebsocketControllerTests.coffee

@@ -23,6 +23,7 @@ describe 'WebsocketController', ->
 			set: sinon.stub()
 			get: (param, cb) -> cb null, @params[param]
 			join: sinon.stub()
+			leave: sinon.stub()
 		@WebsocketController = SandboxedModule.require modulePath, requires:
 			"./WebApiManager": @WebApiManager = {}
 			"./AuthorizationManager": @AuthorizationManager = {}
@@ -154,3 +155,16 @@ describe 'WebsocketController', ->
 			
 			it "should not call the DocumentUpdaterManager", ->
 				@DocumentUpdaterManager.getDocument.called.should.equal false
+				
+	describe "leaveDoc", ->
+		beforeEach ->
+			@doc_id = "doc-id-123"			
+			@client.params.project_id = @project_id
+			@WebsocketController.leaveDoc @client, @doc_id, @callback
+			
+		it "should remove the client from the doc_id room", ->
+			@client.leave
+				.calledWith(@doc_id).should.equal true
+				
+		it "should call the callback", ->
+			@callback.called.should.equal true