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# -*- coding: utf-8 -*-
# Copyright 2014 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.
from twisted.internet import defer
from base import RestServlet, client_path_pattern
import hmac
import hashlib
import base64
class VoipRestServlet(RestServlet):
PATTERN = client_path_pattern("/voip/turnServer$")
@defer.inlineCallbacks
def on_GET(self, request):
auth_user = yield self.auth.get_user_by_req(request)
turnUris = self.hs.config.turn_uris
turnSecret = self.hs.config.turn_shared_secret
userLifetime = self.hs.config.turn_user_lifetime
if not turnUris or not turnSecret or not userLifetime:
defer.returnValue( (200, {"uris": []}) )
expiry = self.hs.get_clock().time_msec() + userLifetime
username = "%d:%s" % (expiry, auth_user.to_string())
mac = hmac.new(turnSecret, msg=username, digestmod=hashlib.sha1)
# We need to use standard base64 encoding here, *not* syutil's encode_base64
# because we need to add the standard padding to get the same result as the
# TURN server.
password = base64.b64encode(mac.digest())
defer.returnValue( (200, {
'username': username,
'password': password,
'ttl': userLifetime / 1000,
'uris': turnUris,
}) )
def on_OPTIONS(self, request):
return (200, {})
def register_servlets(hs, http_server):
VoipRestServlet(hs).register(http_server)
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