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https://github.com/python-telegram-bot/python-telegram-bot.git
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289 lines
12 KiB
Python
289 lines
12 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2022
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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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 Lesser 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 Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains an object that represents a Telegram File."""
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import shutil
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import urllib.parse as urllib_parse
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from base64 import b64decode
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from pathlib import Path
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from typing import TYPE_CHECKING, BinaryIO, Optional
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from telegram._passport.credentials import decrypt
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from telegram._telegramobject import TelegramObject
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from telegram._utils.defaultvalue import DEFAULT_NONE
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from telegram._utils.files import is_local_file
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from telegram._utils.types import FilePathInput, JSONDict, ODVInput
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if TYPE_CHECKING:
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from telegram import FileCredentials
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class File(TelegramObject):
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"""
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This object represents a file ready to be downloaded. The file can be e.g. downloaded with
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:attr:`download_to_memory`. It is guaranteed that the link will be valid for at least 1 hour.
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When the link expires, a new one can be requested by calling :meth:`telegram.Bot.get_file`.
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Objects of this class are comparable in terms of equality. Two objects of this class are
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considered equal, if their :attr:`file_unique_id` is equal.
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.. versionchanged:: 20.0:
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``download`` was split into :meth:`download_to_memory` and :meth:`download_to_object`.
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Note:
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* Maximum file size to download is
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:tg-const:`telegram.constants.FileSizeLimit.FILESIZE_DOWNLOAD`.
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* If you obtain an instance of this class from :attr:`telegram.PassportFile.get_file`,
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then it will automatically be decrypted as it downloads when you call e.g.
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:meth:`download_to_memory`.
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Args:
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file_id (:obj:`str`): Identifier for this file, which can be used to download
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or reuse the file.
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file_unique_id (:obj:`str`): Unique identifier for this file, which
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is supposed to be the same over time and for different bots.
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Can't be used to download or reuse the file.
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file_size (:obj:`int`, optional): Optional. File size in bytes, if known.
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file_path (:obj:`str`, optional): File path. Use e.g. :meth:`download_to_memory` to get the
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file.
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Attributes:
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file_id (:obj:`str`): Identifier for this file.
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file_unique_id (:obj:`str`): Unique identifier for this file, which
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is supposed to be the same over time and for different bots.
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Can't be used to download or reuse the file.
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file_size (:obj:`str`): Optional. File size in bytes.
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file_path (:obj:`str`): Optional. File path. Use e.g. :meth:`download_to_memory` to get
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the file.
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"""
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__slots__ = (
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"file_id",
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"file_size",
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"file_unique_id",
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"file_path",
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"_credentials",
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)
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def __init__(
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self,
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file_id: str,
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file_unique_id: str,
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file_size: int = None,
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file_path: str = None,
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*,
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api_kwargs: JSONDict = None,
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):
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super().__init__(api_kwargs=api_kwargs)
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# Required
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self.file_id = str(file_id)
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self.file_unique_id = str(file_unique_id)
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# Optionals
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self.file_size = file_size
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self.file_path = file_path
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self._credentials: Optional["FileCredentials"] = None
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self._id_attrs = (self.file_unique_id,)
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def _get_encoded_url(self) -> str:
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"""Convert any UTF-8 char in :obj:`File.file_path` into a url encoded ASCII string."""
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sres = urllib_parse.urlsplit(str(self.file_path))
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return urllib_parse.urlunsplit(
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urllib_parse.SplitResult(
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sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment
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)
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)
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def _prepare_decrypt(self, buf: bytes) -> bytes:
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return decrypt(b64decode(self._credentials.secret), b64decode(self._credentials.hash), buf)
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async def download_to_memory(
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self,
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custom_path: FilePathInput = None,
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read_timeout: ODVInput[float] = DEFAULT_NONE,
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write_timeout: ODVInput[float] = DEFAULT_NONE,
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connect_timeout: ODVInput[float] = DEFAULT_NONE,
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pool_timeout: ODVInput[float] = DEFAULT_NONE,
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) -> Path:
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"""
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Download this file. By default, the file is saved in the current working directory with its
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original filename as reported by Telegram. If the file has no filename, the file ID will
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be used as filename. If :paramref:`custom_path` is supplied as a :obj:`str` or
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:obj:`pathlib.Path`, it will be saved to that path.
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Note:
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If :paramref:`custom_path` isn't provided and :attr:`file_path` is the path of a
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local file (which is the case when a Bot API Server is running in local mode), this
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method will just return the path.
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The only exception to this are encrypted files (e.g. a passport file). For these, a
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file with the prefix `decrypted_` will be created in the same directory as the
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original file in order to decrypt the file without changing the existing one
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in-place.
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.. versionchanged:: 20.0
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* :paramref:`custom_path` parameter now also accepts :class:`pathlib.Path` as argument.
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* Returns :class:`pathlib.Path` object in cases where previously a :obj:`str` was
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returned.
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* This method was previously called ``download``. It was split into
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:meth:`download_to_memory` and :meth:`download_to_object`.
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Args:
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custom_path (:class:`pathlib.Path` | :obj:`str` , optional): The path where the file
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will be saved to. If not specified, will be saved in the current working directory.
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read_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.read_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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write_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.write_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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connect_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.connect_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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pool_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.pool_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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Returns:
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:class:`pathlib.Path`: Returns the Path object the file was downloaded to.
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"""
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local_file = is_local_file(self.file_path)
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url = None if local_file else self._get_encoded_url()
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# if _credentials exists we want to decrypt the file
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if local_file and self._credentials:
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file_to_decrypt = Path(self.file_path)
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buf = self._prepare_decrypt(file_to_decrypt.read_bytes())
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if custom_path is not None:
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path = Path(custom_path)
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else:
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path = Path(str(file_to_decrypt.parent) + "/decrypted_" + file_to_decrypt.name)
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path.write_bytes(buf)
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return path
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if custom_path is not None and local_file:
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shutil.copyfile(self.file_path, str(custom_path))
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return Path(custom_path)
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if custom_path:
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filename = Path(custom_path)
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elif local_file:
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return Path(self.file_path)
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elif self.file_path:
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filename = Path(Path(self.file_path).name)
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else:
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filename = Path.cwd() / self.file_id
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buf = await self.get_bot().request.retrieve(
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url,
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read_timeout=read_timeout,
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write_timeout=write_timeout,
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connect_timeout=connect_timeout,
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pool_timeout=pool_timeout,
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)
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if self._credentials:
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buf = self._prepare_decrypt(buf)
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filename.write_bytes(buf)
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return filename
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async def download_to_object(
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self,
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out: BinaryIO,
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read_timeout: ODVInput[float] = DEFAULT_NONE,
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write_timeout: ODVInput[float] = DEFAULT_NONE,
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connect_timeout: ODVInput[float] = DEFAULT_NONE,
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pool_timeout: ODVInput[float] = DEFAULT_NONE,
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) -> None:
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"""
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Download this file into memory. :paramref:`out` needs to be supplied with a
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:obj:`io.BufferedIOBase`, the file contents will be saved to that object using the
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:obj:`out.write<io.BufferedIOBase.write>` method.
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.. versionadded:: 20.0
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Args:
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out (:obj:`io.BufferedIOBase`): A file-like object. Must be opened for writing in
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binary mode.
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read_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.read_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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write_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.write_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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connect_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.connect_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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pool_timeout (:obj:`float` | :obj:`None`, optional): Value to pass to
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:paramref:`telegram.request.BaseRequest.post.pool_timeout`. Defaults to
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:attr:`~telegram.request.BaseRequest.DEFAULT_NONE`.
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"""
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local_file = is_local_file(self.file_path)
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url = None if local_file else self._get_encoded_url()
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path = Path(self.file_path) if local_file else None
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if local_file:
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buf = path.read_bytes()
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else:
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buf = await self.get_bot().request.retrieve(
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url,
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read_timeout=read_timeout,
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write_timeout=write_timeout,
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connect_timeout=connect_timeout,
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pool_timeout=pool_timeout,
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)
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if self._credentials:
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buf = self._prepare_decrypt(buf)
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out.write(buf)
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async def download_as_bytearray(self, buf: bytearray = None) -> bytearray:
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"""Download this file and return it as a bytearray.
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Args:
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buf (:obj:`bytearray`, optional): Extend the given bytearray with the downloaded data.
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Returns:
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:obj:`bytearray`: The same object as :paramref:`buf` if it was specified. Otherwise a
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newly allocated :obj:`bytearray`.
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"""
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if buf is None:
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buf = bytearray()
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if is_local_file(self.file_path):
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bytes_data = Path(self.file_path).read_bytes()
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else:
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bytes_data = await self.get_bot().request.retrieve(self._get_encoded_url())
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if self._credentials:
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buf.extend(self._prepare_decrypt(bytes_data))
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else:
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buf.extend(bytes_data)
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return buf
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def set_credentials(self, credentials: "FileCredentials") -> None:
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"""Sets the passport credentials for the file.
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Args:
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credentials (:class:`telegram.FileCredentials`): The credentials.
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"""
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self._credentials = credentials
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