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1# This Source Code Form is subject to the terms of the Mozilla Public 

2# License, v. 2.0. If a copy of the MPL was not distributed with this 

3# file, You can obtain one at https://mozilla.org/MPL/2.0/. 

4# 

5# This file incorporates work covered by the following copyright and 

6# permission notice: 

7# 

8# Copyright (c) Jeremy Lainé. 

9# All rights reserved. 

10# 

11# Redistribution and use in source and binary forms, with or without 

12# modification, are permitted provided that the following conditions are met: 

13# 

14# * Redistributions of source code must retain the above copyright notice, 

15# this list of conditions and the following disclaimer. 

16# * Redistributions in binary form must reproduce the above copyright notice, 

17# this list of conditions and the following disclaimer in the documentation 

18# and/or other materials provided with the distribution. 

19# * Neither the name of aiortc nor the names of its contributors may 

20# be used to endorse or promote products derived from this software without 

21# specific prior written permission. 

22# 

23# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 

24# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 

25# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 

26# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 

27# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 

28# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 

29# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 

30# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 

31# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 

32# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

33 

34from dataclasses import dataclass 

35 

36 

37@dataclass 

38class RTCSessionDescription: 

39 """ 

40 The :class:`RTCSessionDescription` dictionary describes one end of a 

41 connection and how it's configured. 

42 """ 

43 

44 sdp: str 

45 type: str 

46 

47 def __post_init__(self) -> None: 

48 if self.type not in {"offer", "pranswer", "answer", "rollback"}: 

49 raise ValueError( 

50 "'type' must be in ['offer', 'pranswer', 'answer', 'rollback'] " 

51 f"(got '{self.type}')" 

52 )