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# Pyrogram - Telegram MTProto API Client Library for Python

# This file is part of Pyrogram.

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

from base64 import b64decode, b64encode

from ...api import types

def decode(s: str) -> bytes:

s = b64decode(s + "=" * (-len(s) % 4), "-_")

r = b""

assert s[-1] == 2

i = 0

while i < len(s) - 1:

if s[i] != 0:

r += bytes([s[i]])

else:

r += b"\x00" * s[i + 1]

i += 1

return r

def encode(s: bytes) -> str:

r = b""

n = 0

for i in s + bytes([2]):

if i == 0:

n += 1

else:

if n:

r += b"\x00" + bytes([n])

n = 0

r += bytes([i])

return b64encode(r, b"-_").decode().rstrip("=")

def get_peer_id(input_peer) -> int:

return (

input_peer.user_id

if isinstance(input_peer, types.InputPeerUser)

else -input_peer.chat_id

if isinstance(input_peer, types.InputPeerChat)

else int("-100" + str(input_peer.channel_id))

)

def get_input_peer(peer_id: int, access_hash: int):

return (

types.InputPeerUser(peer_id, access_hash)

if peer_id > 0

else types.InputPeerChannel(int(str(peer_id)[4:]), access_hash)

if (str(peer_id).startswith("-100") and access_hash)

else types.InputPeerChat(-peer_id)

)

def get_offset_date(dialogs):

for m in reversed(dialogs.messages):

if isinstance(m, types.MessageEmpty):

continue

else:

return m.date

else:

return 0

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