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# Pyrogram - Telegram MTProto API Client Library for Python

# Copyright (C) 2017-present Dan <https://github.com/delivrance>

#

# 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/>.

import pyrogram

from pyrogram import raw

from pyrogram.errors import AuthBytesInvalid

from pyrogram.session import Session

from pyrogram.session.auth import Auth

async def get_session(client: "pyrogram.Client", dc_id: int):

if dc_id == await client.storage.dc_id():

return client

async with client.media_sessions_lock:

if client.media_sessions.get(dc_id):

return client.media_sessions[dc_id]

session = client.media_sessions[dc_id] = Session(

client, dc_id,

await Auth(client, dc_id, await client.storage.test_mode()).create(),

await client.storage.test_mode(), is_media=True

)

await session.start()

for _ in range(3):

exported_auth = await client.invoke(

raw.functions.auth.ExportAuthorization(

dc_id=dc_id

)

)

try:

await session.invoke(

raw.functions.auth.ImportAuthorization(

id=exported_auth.id,

bytes=exported_auth.bytes

)

)

except AuthBytesInvalid:

continue

else:

break

else:

await session.stop()

raise AuthBytesInvalid

return session