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88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import base64
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import hashlib
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import hmac
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from typing import TYPE_CHECKING, Tuple
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from synapse.http.server import HttpServer
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from synapse.http.servlet import RestServlet
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from synapse.http.site import SynapseRequest
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from synapse.rest.client._base import client_patterns
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from synapse.types import JsonDict
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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class VoipRestServlet(RestServlet):
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PATTERNS = client_patterns("/voip/turnServer$", v1=True)
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CATEGORY = "Client API requests"
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def __init__(self, hs: "HomeServer"):
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super().__init__()
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self.hs = hs
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self.auth = hs.get_auth()
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async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
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requester = await self.auth.get_user_by_req(
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request, self.hs.config.voip.turn_allow_guests
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)
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turnUris = self.hs.config.voip.turn_uris
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turnSecret = self.hs.config.voip.turn_shared_secret
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turnUsername = self.hs.config.voip.turn_username
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turnPassword = self.hs.config.voip.turn_password
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userLifetime = self.hs.config.voip.turn_user_lifetime
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if turnUris and turnSecret and userLifetime:
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expiry = (self.hs.get_clock().time_msec() + userLifetime) / 1000
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username = "%d:%s" % (expiry, requester.user.to_string())
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mac = hmac.new(
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turnSecret.encode(), msg=username.encode(), digestmod=hashlib.sha1
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)
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# We need to use standard padded base64 encoding here
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# encode_base64 because we need to add the standard padding to get the
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# same result as the TURN server.
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password = base64.b64encode(mac.digest()).decode("ascii")
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elif turnUris and turnUsername and turnPassword and userLifetime:
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username = turnUsername
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password = turnPassword
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else:
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return 200, {}
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return (
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200,
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{
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"username": username,
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"password": password,
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"ttl": userLifetime // 1000,
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"uris": turnUris,
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},
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)
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def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
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VoipRestServlet(hs).register(http_server)
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