synapse-product/synapse/rest/client/v1/voip.py

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# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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import base64
import hashlib
import hmac
from twisted.internet import defer
from .base import ClientV1RestServlet, client_path_patterns
class VoipRestServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/voip/turnServer$")
@defer.inlineCallbacks
def on_GET(self, request):
requester = yield self.auth.get_user_by_req(
request,
self.hs.config.turn_allow_guests
)
turnUris = self.hs.config.turn_uris
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turnSecret = self.hs.config.turn_shared_secret
turnUsername = self.hs.config.turn_username
turnPassword = self.hs.config.turn_password
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userLifetime = self.hs.config.turn_user_lifetime
if turnUris and turnSecret and userLifetime:
expiry = (self.hs.get_clock().time_msec() + userLifetime) / 1000
username = "%d:%s" % (expiry, requester.user.to_string())
mac = hmac.new(
turnSecret.encode(),
msg=username.encode(),
digestmod=hashlib.sha1
)
# We need to use standard padded base64 encoding here
# encode_base64 because we need to add the standard padding to get the
# same result as the TURN server.
password = base64.b64encode(mac.digest())
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elif turnUris and turnUsername and turnPassword and userLifetime:
username = turnUsername
password = turnPassword
else:
defer.returnValue((200, {}))
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defer.returnValue((200, {
'username': username,
'password': password,
'ttl': userLifetime / 1000,
'uris': turnUris,
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}))
def on_OPTIONS(self, request):
return (200, {})
def register_servlets(hs, http_server):
VoipRestServlet(hs).register(http_server)