Tulir Asokan
321 lines
13 KiB
Python
321 lines
13 KiB
Python
# mautrix-telegram - A Matrix-Telegram puppeting bridge
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# Copyright (C) 2019 Tulir Asokan
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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 published by
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# 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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# This program 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from typing import Optional, List, AsyncGenerator, Union, Awaitable, DefaultDict, Tuple, cast
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from collections import defaultdict
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import hashlib
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import asyncio
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import logging
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import time
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import math
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from aiohttp import ClientResponse
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from telethon.tl.types import (Document, InputFileLocation, InputDocumentFileLocation,
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InputPhotoFileLocation, InputPeerPhotoFileLocation, TypeInputFile,
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InputFileBig, InputFile)
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from telethon.tl.functions.auth import ExportAuthorizationRequest, ImportAuthorizationRequest
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from telethon.tl.functions.upload import (GetFileRequest, SaveFilePartRequest,
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SaveBigFilePartRequest)
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from telethon.network import MTProtoSender
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from telethon.crypto import AuthKey
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from telethon import utils, helpers
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from mautrix.appservice import IntentAPI
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from mautrix.types import ContentURI, EncryptedFile
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from mautrix.util.logging import TraceLogger
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from ..tgclient import MautrixTelegramClient
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from ..db import TelegramFile as DBTelegramFile
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try:
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from nio.crypto import async_encrypt_attachment
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except ImportError:
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async_encrypt_attachment = None
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log: TraceLogger = cast(TraceLogger, logging.getLogger("mau.util"))
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TypeLocation = Union[Document, InputDocumentFileLocation, InputPeerPhotoFileLocation,
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InputFileLocation, InputPhotoFileLocation]
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class DownloadSender:
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sender: MTProtoSender
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request: GetFileRequest
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remaining: int
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stride: int
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def __init__(self, sender: MTProtoSender, file: TypeLocation, offset: int, limit: int,
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stride: int, count: int) -> None:
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self.sender = sender
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self.request = GetFileRequest(file, offset=offset, limit=limit)
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self.stride = stride
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self.remaining = count
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async def next(self) -> Optional[bytes]:
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if not self.remaining:
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return None
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result = await self.sender.send(self.request)
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self.remaining -= 1
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self.request.offset += self.stride
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return result.bytes
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def disconnect(self) -> Awaitable[None]:
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return self.sender.disconnect()
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class UploadSender:
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sender: MTProtoSender
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request: Union[SaveFilePartRequest, SaveBigFilePartRequest]
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part_count: int
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stride: int
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previous: Optional[asyncio.Task]
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loop: asyncio.AbstractEventLoop
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def __init__(self, sender: MTProtoSender, file_id: int, part_count: int, big: bool, index: int,
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stride: int, loop: asyncio.AbstractEventLoop) -> None:
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self.sender = sender
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self.part_count = part_count
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if big:
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self.request = SaveBigFilePartRequest(file_id, index, part_count, b"")
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else:
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self.request = SaveFilePartRequest(file_id, index, b"")
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self.stride = stride
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self.previous = None
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self.loop = loop
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async def next(self, data: bytes) -> None:
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if self.previous:
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await self.previous
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self.previous = self.loop.create_task(self._next(data))
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async def _next(self, data: bytes) -> None:
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self.request.bytes = data
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log.trace(f"Sending file part {self.request.file_part}/{self.part_count}"
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f" with {len(data)} bytes")
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await self.sender.send(self.request)
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self.request.file_part += self.stride
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async def disconnect(self) -> None:
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if self.previous:
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await self.previous
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return await self.sender.disconnect()
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class ParallelTransferrer:
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client: MautrixTelegramClient
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loop: asyncio.AbstractEventLoop
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dc_id: int
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senders: Optional[List[Union[DownloadSender, UploadSender]]]
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auth_key: AuthKey
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upload_ticker: int
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def __init__(self, client: MautrixTelegramClient, dc_id: Optional[int] = None) -> None:
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self.client = client
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self.loop = self.client.loop
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self.dc_id = dc_id or self.client.session.dc_id
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self.auth_key = (None if dc_id and self.client.session.dc_id != dc_id
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else self.client.session.auth_key)
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self.senders = None
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self.upload_ticker = 0
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async def _cleanup(self) -> None:
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await asyncio.gather(*[sender.disconnect() for sender in self.senders])
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self.senders = None
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@staticmethod
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def _get_connection_count(file_size: int, max_count: int = 20,
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full_size: int = 100 * 1024 * 1024) -> int:
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if file_size > full_size:
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return max_count
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return math.ceil((file_size / full_size) * max_count)
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async def _init_download(self, connections: int, file: TypeLocation, part_count: int,
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part_size: int) -> None:
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minimum, remainder = divmod(part_count, connections)
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def get_part_count() -> int:
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nonlocal remainder
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if remainder > 0:
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remainder -= 1
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return minimum + 1
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return minimum
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# The first cross-DC sender will export+import the authorization, so we always create it
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# before creating any other senders.
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self.senders = [
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await self._create_download_sender(file, 0, part_size, connections * part_size,
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get_part_count()),
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*await asyncio.gather(
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*[self._create_download_sender(file, i, part_size, connections * part_size,
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get_part_count())
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for i in range(1, connections)])
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]
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async def _create_download_sender(self, file: TypeLocation, index: int, part_size: int,
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stride: int,
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part_count: int) -> DownloadSender:
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return DownloadSender(await self._create_sender(), file, index * part_size, part_size,
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stride, part_count)
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async def _init_upload(self, connections: int, file_id: int, part_count: int, big: bool
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) -> None:
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self.senders = [
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await self._create_upload_sender(file_id, part_count, big, 0, connections),
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*await asyncio.gather(
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*[self._create_upload_sender(file_id, part_count, big, i, connections)
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for i in range(1, connections)])
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]
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async def _create_upload_sender(self, file_id: int, part_count: int, big: bool, index: int,
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stride: int) -> UploadSender:
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return UploadSender(await self._create_sender(), file_id, part_count, big, index, stride,
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loop=self.loop)
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async def _create_sender(self) -> MTProtoSender:
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dc = await self.client._get_dc(self.dc_id)
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sender = MTProtoSender(self.auth_key, self.loop, loggers=self.client._log)
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await sender.connect(self.client._connection(dc.ip_address, dc.port, dc.id,
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loop=self.loop, loggers=self.client._log,
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proxy=self.client._proxy))
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if not self.auth_key:
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log.debug(f"Exporting auth to DC {self.dc_id}")
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auth = await self.client(ExportAuthorizationRequest(self.dc_id))
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req = self.client._init_with(ImportAuthorizationRequest(
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id=auth.id, bytes=auth.bytes
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))
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await sender.send(req)
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self.auth_key = sender.auth_key
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return sender
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async def init_upload(self, file_id: int, file_size: int, part_size_kb: Optional[float] = None,
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connection_count: Optional[int] = None) -> Tuple[int, int, bool]:
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connection_count = connection_count or self._get_connection_count(file_size)
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part_size = (part_size_kb or utils.get_appropriated_part_size(file_size)) * 1024
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part_count = (file_size + part_size - 1) // part_size
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is_large = file_size > 10 * 1024 * 1024
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await self._init_upload(connection_count, file_id, part_count, is_large)
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return part_size, part_count, is_large
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async def upload(self, part: bytes) -> None:
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await self.senders[self.upload_ticker].next(part)
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self.upload_ticker = (self.upload_ticker + 1) % len(self.senders)
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async def finish_upload(self) -> None:
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await self._cleanup()
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async def download(self, file: TypeLocation, file_size: int,
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part_size_kb: Optional[float] = None,
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connection_count: Optional[int] = None) -> AsyncGenerator[bytes, None]:
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connection_count = connection_count or self._get_connection_count(file_size)
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part_size = (part_size_kb or utils.get_appropriated_part_size(file_size)) * 1024
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part_count = math.ceil(file_size / part_size)
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log.debug("Starting parallel download: "
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f"{connection_count} {part_size} {part_count} {file!s}")
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await self._init_download(connection_count, file, part_count, part_size)
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part = 0
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while part < part_count:
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tasks = []
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for sender in self.senders:
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tasks.append(self.loop.create_task(sender.next()))
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for task in tasks:
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data = await task
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if not data:
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break
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yield data
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part += 1
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log.trace(f"Part {part} downloaded")
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log.debug("Parallel download finished, cleaning up connections")
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await self._cleanup()
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parallel_transfer_locks: DefaultDict[int, asyncio.Lock] = defaultdict(lambda: asyncio.Lock())
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async def parallel_transfer_to_matrix(client: MautrixTelegramClient, intent: IntentAPI,
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loc_id: str, location: TypeLocation, filename: str,
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encrypt: bool, parallel_id: int) -> DBTelegramFile:
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size = location.size
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mime_type = location.mime_type
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dc_id, location = utils.get_input_location(location)
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# We lock the transfers because telegram has connection count limits
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async with parallel_transfer_locks[parallel_id]:
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downloader = ParallelTransferrer(client, dc_id)
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data = downloader.download(location, size)
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decryption_info = None
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up_mime_type = mime_type
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if encrypt and async_encrypt_attachment:
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async def encrypted(stream):
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nonlocal decryption_info
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async for chunk in async_encrypt_attachment(stream):
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if isinstance(chunk, dict):
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decryption_info = EncryptedFile.deserialize(chunk)
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else:
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yield chunk
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data = encrypted(data)
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up_mime_type = "application/octet-stream"
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content_uri = await intent.upload_media(data, mime_type=up_mime_type, filename=filename,
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size=size if not encrypt else None)
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if decryption_info:
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decryption_info.url = content_uri
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return DBTelegramFile(id=loc_id, mxc=content_uri, mime_type=mime_type,
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was_converted=False, timestamp=int(time.time()), size=size,
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width=None, height=None, decryption_info=decryption_info)
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async def _internal_transfer_to_telegram(client: MautrixTelegramClient, response: ClientResponse
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) -> Tuple[TypeInputFile, int]:
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file_id = helpers.generate_random_long()
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file_size = response.content_length
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hash_md5 = hashlib.md5()
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uploader = ParallelTransferrer(client)
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part_size, part_count, is_large = await uploader.init_upload(file_id, file_size)
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buffer = bytearray()
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async for data in response.content:
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if not is_large:
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hash_md5.update(data)
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if len(buffer) == 0 and len(data) == part_size:
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await uploader.upload(data)
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continue
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new_len = len(buffer) + len(data)
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if new_len >= part_size:
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cutoff = part_size - len(buffer)
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buffer.extend(data[:cutoff])
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await uploader.upload(bytes(buffer))
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buffer.clear()
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buffer.extend(data[cutoff:])
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else:
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buffer.extend(data)
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if len(buffer) > 0:
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await uploader.upload(bytes(buffer))
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await uploader.finish_upload()
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if is_large:
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return InputFileBig(file_id, part_count, "upload"), file_size
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else:
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return InputFile(file_id, part_count, "upload", hash_md5.hexdigest()), file_size
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async def parallel_transfer_to_telegram(client: MautrixTelegramClient, intent: IntentAPI,
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uri: ContentURI, parallel_id: int
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) -> Tuple[TypeInputFile, int]:
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url = intent.api.get_download_url(uri)
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async with parallel_transfer_locks[parallel_id]:
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async with intent.api.session.get(url) as response:
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return await _internal_transfer_to_telegram(client, response)
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