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route.py
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route.py
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import asyncio
import json
import random
import logging
import hashlib
import inspect
from aiohttp import web, hdrs
from sockjs.session import SessionManager
from sockjs.protocol import IFRAME_HTML
from sockjs.transports import handlers
from sockjs.transports.utils import CACHE_CONTROL
from sockjs.transports.utils import session_cookie
from sockjs.transports.utils import cors_headers
from sockjs.transports.utils import cache_headers
from sockjs.transports.rawwebsocket import RawWebSocketTransport
log = logging.getLogger('sockjs')
def get_manager(name, app):
return app['__sockjs_managers__'][name]
def _gen_endpoint_name():
return 'n' + str(random.randint(1000, 9999))
def add_endpoint(app, handler, *, name='', prefix='/sockjs',
manager=None, disable_transports=(),
sockjs_cdn='http://cdn.sockjs.org/sockjs-0.3.3.min.js',
cookie_needed=True):
assert callable(handler), handler
if (not asyncio.iscoroutinefunction(handler) and
not inspect.isgeneratorfunction(handler)):
handler = asyncio.coroutine(handler)
router = app.router
if not name:
name = _gen_endpoint_name()
# set session manager
if manager is None:
manager = SessionManager(name, app, handler, app.loop)
if manager.name != name:
raise ValueError(
'Session manage must have same name as sockjs route')
managers = app.setdefault('__sockjs_managers__', {})
if name in managers:
raise ValueError('SockJS "%s" route already registered' % name)
managers[name] = manager
# register routes
route = SockJSRoute(
name, manager, sockjs_cdn,
handlers, disable_transports, cookie_needed)
if prefix.endswith('/'):
prefix = prefix[:-1]
route_name = 'sockjs-url-%s-greeting' % name
router.add_route(
hdrs.METH_GET, prefix, route.greeting, name=route_name)
route_name = 'sockjs-url-%s' % name
router.add_route(
hdrs.METH_GET, '%s/' % prefix,
route.greeting, name=route_name)
route_name = 'sockjs-%s' % name
router.add_route(
hdrs.METH_ANY,
'%s/{server}/{session}/{transport}' % prefix,
route.handler, name=route_name)
route_name = 'sockjs-websocket-%s' % name
router.add_route(
hdrs.METH_GET, '%s/websocket' % prefix,
route.websocket, name=route_name)
router.add_route(
hdrs.METH_GET, '%s/info' % prefix,
route.info, name='sockjs-info-%s' % name)
router.add_route(
hdrs.METH_OPTIONS,
'%s/info' % prefix,
route.info_options, name='sockjs-info-options-%s' % name)
route_name = 'sockjs-iframe-%s' % name
router.add_route(
hdrs.METH_GET,
'%s/iframe.html' % prefix, route.iframe, name=route_name)
route_name = 'sockjs-iframe-ver-%s' % name
router.add_route(
hdrs.METH_GET,
'%s/iframe{version}.html' % prefix, route.iframe, name=route_name)
# start session gc
manager.start()
class SockJSRoute:
def __init__(self, name, manager,
sockjs_cdn, handlers, disable_transports, cookie_needed=True):
self.name = name
self.manager = manager
self.handlers = handlers
self.disable_transports = dict((k, 1) for k in disable_transports)
self.cookie_needed = cookie_needed
self.iframe_html = (IFRAME_HTML % sockjs_cdn).encode('utf-8')
self.iframe_html_hxd = hashlib.md5(self.iframe_html).hexdigest()
@asyncio.coroutine
def handler(self, request):
info = request.match_info
# lookup transport
tid = info['transport']
if tid not in self.handlers or tid in self.disable_transports:
return web.HTTPNotFound()
create, transport = self.handlers[tid]
# session
manager = self.manager
if not manager.started:
manager.start()
sid = info['session']
if not sid or '.' in sid or '.' in info['server']:
return web.HTTPNotFound()
try:
session = manager.get(sid, create, request=request)
except KeyError:
return web.HTTPNotFound(headers=session_cookie(request))
t = transport(manager, session, request)
try:
return (yield from t.process())
except asyncio.CancelledError:
raise
except web.HTTPException as exc:
return exc
except Exception as exc:
log.exception('Exception in transport: %s' % tid)
if manager.is_acquired(session):
yield from manager.release(session)
return web.HTTPInternalServerError()
@asyncio.coroutine
def websocket(self, request):
# session
sid = '%0.9d' % random.randint(1, 2147483647)
session = self.manager.get(sid, True, request=request)
transport = RawWebSocketTransport(self.manager, session, request)
try:
return (yield from transport.process())
except asyncio.CancelledError:
raise
except web.HTTPException as exc:
return exc
def info(self, request):
resp = web.Response()
resp.headers[hdrs.CONTENT_TYPE] = 'application/json;charset=UTF-8'
resp.headers[hdrs.CACHE_CONTROL] = CACHE_CONTROL
resp.headers.extend(cors_headers(request.headers))
info = {'entropy': random.randint(1, 2147483647),
'websocket': 'websocket' not in self.disable_transports,
'cookie_needed': self.cookie_needed,
'origins': ['*:*']}
resp.text = json.dumps(info)
return resp
def info_options(self, request):
resp = web.Response(status=204)
resp.headers[hdrs.CONTENT_TYPE] = 'application/json;charset=UTF-8'
resp.headers[hdrs.CACHE_CONTROL] = CACHE_CONTROL
resp.headers[hdrs.ACCESS_CONTROL_ALLOW_METHODS] = 'OPTIONS, GET'
resp.headers.extend(cors_headers(request.headers))
resp.headers.extend(cache_headers())
resp.headers.extend(session_cookie(request))
return resp
def iframe(self, request):
cached = request.headers.get(hdrs.IF_NONE_MATCH)
if cached:
response = web.Response(status=304)
response.headers[hdrs.CONTENT_TYPE] = ''
response.headers.extend(cache_headers())
return response
return web.Response(
body=self.iframe_html,
headers=(
(hdrs.CONTENT_TYPE, 'text/html;charset=UTF-8'),
(hdrs.ETAG, self.iframe_html_hxd),) + cache_headers())
def greeting(self, request):
return web.Response(
body=b'Welcome to SockJS!\n',
headers=((hdrs.CONTENT_TYPE, 'text/plain; charset=UTF-8'),))