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https://github.com/python-telegram-bot/python-telegram-bot.git
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111 lines
3.8 KiB
Python
111 lines
3.8 KiB
Python
#!/usr/bin/env python
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# pylint: disable=W0622,E0611
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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) 2015-2021
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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 InputFile."""
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import imghdr
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import logging
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import mimetypes
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import os
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from typing import IO, Optional, Tuple, Union
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from uuid import uuid4
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DEFAULT_MIME_TYPE = 'application/octet-stream'
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logger = logging.getLogger(__name__)
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class InputFile:
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"""This object represents a Telegram InputFile.
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Args:
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obj (:obj:`File handler` | :obj:`bytes`): An open file descriptor or the files content as
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bytes.
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filename (:obj:`str`, optional): Filename for this InputFile.
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attach (:obj:`bool`, optional): Whether this should be send as one file or is part of a
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collection of files.
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Raises:
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TelegramError
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Attributes:
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input_file_content (:obj:`bytes`): The binary content of the file to send.
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filename (:obj:`str`): Optional. Filename for the file to be sent.
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attach (:obj:`str`): Optional. Attach id for sending multiple files.
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"""
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def __init__(self, obj: Union[IO, bytes], filename: str = None, attach: bool = None):
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self.filename = None
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if isinstance(obj, bytes):
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self.input_file_content = obj
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else:
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self.input_file_content = obj.read()
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self.attach = 'attached' + uuid4().hex if attach else None
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if filename:
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self.filename = filename
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elif hasattr(obj, 'name') and not isinstance(obj.name, int): # type: ignore[union-attr]
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self.filename = os.path.basename(obj.name) # type: ignore[union-attr]
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image_mime_type = self.is_image(self.input_file_content)
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if image_mime_type:
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self.mimetype = image_mime_type
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elif self.filename:
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self.mimetype = mimetypes.guess_type(self.filename)[0] or DEFAULT_MIME_TYPE
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else:
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self.mimetype = DEFAULT_MIME_TYPE
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if not self.filename:
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self.filename = self.mimetype.replace('/', '.')
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@property
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def field_tuple(self) -> Tuple[str, bytes, str]:
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return self.filename, self.input_file_content, self.mimetype
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@staticmethod
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def is_image(stream: bytes) -> Optional[str]:
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"""Check if the content file is an image by analyzing its headers.
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Args:
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stream (:obj:`bytes`): A byte stream representing the content of a file.
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Returns:
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:obj:`str` | :obj:`None`: The mime-type of an image, if the input is an image, or
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:obj:`None` else.
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"""
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try:
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image = imghdr.what(None, stream)
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if image:
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return f'image/{image}'
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return None
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except Exception:
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logger.debug(
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"Could not parse file content. Assuming that file is not an image.", exc_info=True
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)
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return None
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@staticmethod
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def is_file(obj: object) -> bool:
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return hasattr(obj, 'read')
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def to_dict(self) -> Optional[str]:
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if self.attach:
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return 'attach://' + self.attach
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return None
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