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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.
import base64
import hashlib
import hmac
from typing import TYPE_CHECKING, Tuple
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet
from synapse.http.site import SynapseRequest
from synapse.rest.client._base import client_patterns
from synapse.types import JsonDict
if TYPE_CHECKING:
from synapse.server import HomeServer
class VoipRestServlet(RestServlet):
PATTERNS = client_patterns("/voip/turnServer$", v1=True)
def __init__(self, hs: "HomeServer"):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(
request, self.hs.config.voip.turn_allow_guests
)
turnUris = self.hs.config.voip.turn_uris
turnSecret = self.hs.config.voip.turn_shared_secret
turnUsername = self.hs.config.voip.turn_username
turnPassword = self.hs.config.voip.turn_password
userLifetime = self.hs.config.voip.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()).decode("ascii")
elif turnUris and turnUsername and turnPassword and userLifetime:
username = turnUsername
password = turnPassword
else:
return 200, {}
return (
200,
{
"username": username,
"password": password,
"ttl": userLifetime // 1000,
"uris": turnUris,
},
)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
VoipRestServlet(hs).register(http_server)
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