add support for websocket protocols

daphne/http_protocol.py

@@ -222,7 +222,7 @@ class HTTPFactory(http.HTTPFactory):
 
     protocol = HTTPProtocol
 
-    def __init__(self, channel_layer, action_logger=None, timeout=120, websocket_timeout=86400, ping_interval=20):
+    def __init__(self, channel_layer, action_logger=None, timeout=120, websocket_timeout=86400, ping_interval=20, ws_protocols=None):
         http.HTTPFactory.__init__(self)
         self.channel_layer = channel_layer
         self.action_logger = action_logger
@@ -232,7 +232,7 @@ class HTTPFactory(http.HTTPFactory):
         # We track all sub-protocols for response channel mapping
         self.reply_protocols = {}
         # Make a factory for WebSocket protocols
-        self.ws_factory = WebSocketFactory(self)
+        self.ws_factory = WebSocketFactory(self, protocols=ws_protocols)
         self.ws_factory.protocol = WebSocketProtocol
         self.ws_factory.reply_protocols = self.reply_protocols
 

daphne/server.py

@@ -19,6 +19,7 @@ class Server(object):
         http_timeout=120,
         websocket_timeout=None,
         ping_interval=20,
+        ws_protocols=None,
     ):
         self.channel_layer = channel_layer
         self.host = host
@@ -31,6 +32,7 @@ class Server(object):
         # If they did not provide a websocket timeout, default it to the
         # channel layer's group_expiry value if present, or one day if not.
         self.websocket_timeout = websocket_timeout or getattr(channel_layer, "group_expiry", 86400)
+        self.ws_protocols = ws_protocols
 
     def run(self):
         self.factory = HTTPFactory(
@@ -39,6 +41,7 @@ class Server(object):
             timeout=self.http_timeout,
             websocket_timeout=self.websocket_timeout,
             ping_interval=self.ping_interval,
+            ws_protocols=self.ws_protocols,
         )
         if self.unix_socket:
             reactor.listenUNIX(self.unix_socket, self.factory)

daphne/ws_protocol.py

@@ -57,6 +57,10 @@ class WebSocketProtocol(WebSocketServerProtocol):
             logger.error(traceback.format_exc())
             raise
 
+        ws_protocol = clean_headers.get('sec-websocket-protocol')
+        if ws_protocol and ws_protocol in self.factory.protocols:
+            return ws_protocol
+
     def onOpen(self):
         # Send news that this channel is open
         logger.debug("WebSocket open for %s", self.reply_channel)