138 lines
4.0 KiB
Python
138 lines
4.0 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Pyrogram is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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import struct
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from base64 import b64decode, b64encode
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from typing import Union
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from . import BaseClient
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from ...api import types
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def decode(s: str) -> bytes:
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s = b64decode(s + "=" * (-len(s) % 4), "-_")
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r = b""
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assert s[-1] == 2
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i = 0
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while i < len(s) - 1:
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if s[i] != 0:
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r += bytes([s[i]])
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else:
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r += b"\x00" * s[i + 1]
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i += 1
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i += 1
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return r
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def encode(s: bytes) -> str:
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r = b""
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n = 0
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for i in s + bytes([2]):
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if i == 0:
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n += 1
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else:
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if n:
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r += b"\x00" + bytes([n])
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n = 0
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r += bytes([i])
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return b64encode(r, b"-_").decode().rstrip("=")
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def get_peer_id(input_peer) -> int:
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return (
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input_peer.user_id if isinstance(input_peer, types.InputPeerUser)
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else -input_peer.chat_id if isinstance(input_peer, types.InputPeerChat)
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else int("-100" + str(input_peer.channel_id))
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)
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def get_input_peer(peer_id: int, access_hash: int):
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return (
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types.InputPeerUser(user_id=peer_id, access_hash=access_hash) if peer_id > 0
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else types.InputPeerChannel(channel_id=int(str(peer_id)[4:]), access_hash=access_hash)
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if (str(peer_id).startswith("-100") and access_hash)
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else types.InputPeerChat(chat_id=-peer_id)
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)
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def get_offset_date(dialogs):
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for m in reversed(dialogs.messages):
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if isinstance(m, types.MessageEmpty):
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continue
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else:
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return m.date
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else:
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return 0
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def get_input_media_from_file_id(
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file_id_str: str,
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expected_media_type: int = None
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) -> Union[types.InputMediaPhoto, types.InputMediaDocument]:
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try:
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decoded = decode(file_id_str)
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except Exception:
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raise ValueError("Failed to decode file_id: {}".format(file_id_str))
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else:
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media_type = decoded[0]
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if expected_media_type is not None:
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if media_type != expected_media_type:
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media_type_str = BaseClient.MEDIA_TYPE_ID.get(media_type, None)
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expected_media_type_str = BaseClient.MEDIA_TYPE_ID.get(expected_media_type, None)
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raise ValueError(
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'Expected: "{}", got "{}" file_id instead'.format(expected_media_type_str, media_type_str)
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)
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if media_type in (0, 1, 14):
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raise ValueError("This file_id can only be used for download: {}".format(file_id_str))
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if media_type == 2:
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unpacked = struct.unpack("<iiqqc", decoded)
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dc_id, file_id, access_hash, thumb_size = unpacked[1:]
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return types.InputMediaPhoto(
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id=types.InputPhoto(
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id=file_id,
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access_hash=access_hash,
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file_reference=b""
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)
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)
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if media_type in (3, 4, 5, 8, 9, 10, 13):
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unpacked = struct.unpack("<iiqq", decoded)
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dc_id, file_id, access_hash = unpacked[1:]
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return types.InputMediaDocument(
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id=types.InputDocument(
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id=file_id,
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access_hash=access_hash,
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file_reference=b""
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)
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)
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raise ValueError("Unknown media type: {}".format(file_id_str))
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