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from tornado import websocket, escape
try:
from urllib.parse import urlparse # py3
except ImportError:
from urlparse import urlparse # py2
class SockJSWebSocketHandler(websocket.WebSocketHandler):
def check_origin(self, origin):
# let tornado first check if connection from the same domain
same_domain = super(SockJSWebSocketHandler, self).check_origin(origin)
if same_domain:
return True
# this is cross-origin connection - check using SockJS server settings
allow_origin = self.server.settings.get("websocket_allow_origin", "*")
if allow_origin == "*":
return True
else:
parsed_origin = urlparse(origin)
origin = parsed_origin.netloc
origin = origin.lower()
return origin in allow_origin
def abort_connection(self):
if self.ws_connection:
self.ws_connection._abort()
def _execute(self, transforms, *args, **kwargs):
self._transforms = transforms
# Websocket only supports GET method
if self.request.method != "GET":
self.set_status(405)
self.finish(escape.utf8(
"Allow: GET\r\n"
"Connection: Close\r\n"
"\r\n"
))
return
# Upgrade header should be present and should be equal to WebSocket
if self.request.headers.get("Upgrade", "").lower() != "websocket":
self.set_status(400)
self.finish(escape.utf8(
"Connection: Close\r\n"
"\r\n"
"Can \"Upgrade\" only to \"WebSocket\"."
))
return
# Connection header should be upgrade. Some proxy servers/load balancers
# might mess with it.
headers = self.request.headers
connection = map(lambda s: s.strip().lower(), headers.get("Connection", "").split(","))
if "upgrade" not in connection:
self.set_status(400)
self.finish(escape.utf8(
"Connection: Close\r\n"
"\r\n"
"\"Connection\" must be \"Upgrade\"."
))
return
return super(SockJSWebSocketHandler, self)._execute(transforms, *args, **kwargs)
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