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inputfile.py
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#!/usr/bin/env python
# pylint: disable=W0622,E0611
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2017
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program. If not, see [http://www.gnu.org/licenses/].
"""This module contains an object that represents a Telegram InputFile."""
try:
# python 3
from email.generator import _make_boundary as choose_boundary
except ImportError:
# python 2
from mimetools import choose_boundary
import imghdr
import mimetypes
import os
import sys
from telegram import TelegramError
DEFAULT_MIME_TYPE = 'application/octet-stream'
USER_AGENT = 'Python Telegram Bot (https://github.com/python-telegram-bot/python-telegram-bot)'
FILE_TYPES = ('audio', 'document', 'photo', 'sticker', 'video', 'voice', 'certificate',
'video_note', 'png_sticker')
class InputFile(object):
"""This object represents a Telegram InputFile.
Attributes:
data (:obj:`dict`): Data containing an inputfile.
Args:
data (:obj:`dict`): Data containing an inputfile.
Raises:
TelegramError
"""
def __init__(self, data):
self.data = data
self.boundary = choose_boundary()
for t in FILE_TYPES:
if t in data:
self.input_name = t
self.input_file = data.pop(t)
break
else:
raise TelegramError('Unknown inputfile type')
if hasattr(self.input_file, 'read'):
self.filename = None
self.input_file_content = self.input_file.read()
if 'filename' in data:
self.filename = self.data.pop('filename')
elif hasattr(self.input_file, 'name'):
# on py2.7, pylint fails to understand this properly
# pylint: disable=E1101
self.filename = os.path.basename(self.input_file.name)
try:
self.mimetype = self.is_image(self.input_file_content)
if not self.filename or '.' not in self.filename:
self.filename = self.mimetype.replace('/', '.')
except TelegramError:
if self.filename:
self.mimetype = mimetypes.guess_type(
self.filename)[0] or DEFAULT_MIME_TYPE
else:
self.mimetype = DEFAULT_MIME_TYPE
@property
def headers(self):
""":obj:`dict`: Headers."""
return {'User-agent': USER_AGENT, 'Content-type': self.content_type}
@property
def content_type(self):
""":obj:`str`: Content type"""
return 'multipart/form-data; boundary=%s' % self.boundary
def to_form(self):
"""Transform the inputfile to multipart/form data.
Returns:
:obj:`str`
"""
form = []
form_boundary = '--' + self.boundary
# Add data fields
for name in iter(self.data):
value = self.data[name]
form.extend([
form_boundary, 'Content-Disposition: form-data; name="%s"' % name, '', str(value)
])
# Add input_file to upload
form.extend([
form_boundary, 'Content-Disposition: form-data; name="%s"; filename="%s"' %
(self.input_name,
self.filename), 'Content-Type: %s' % self.mimetype, '', self.input_file_content
])
form.append('--' + self.boundary + '--')
form.append('')
return self._parse(form)
@staticmethod
def _parse(form):
if sys.version_info > (3,):
# on Python 3 form needs to be byte encoded
encoded_form = []
for item in form:
try:
encoded_form.append(item.encode())
except AttributeError:
encoded_form.append(item)
return b'\r\n'.join(encoded_form)
return '\r\n'.join(form)
@staticmethod
def is_image(stream):
"""Check if the content file is an image by analyzing its headers.
Args:
stream (:obj:`str`): A str representing the content of a file.
Returns:
:obj:`str`: The str mime-type of an image.
"""
image = imghdr.what(None, stream)
if image:
return 'image/%s' % image
raise TelegramError('Could not parse file content')
@staticmethod
def is_inputfile(data):
"""Check if the request is a file request.
Args:
data (Dict[:obj:`str`, :obj:`str`]): A dict of (str, str) key/value pairs.
Returns:
:obj:`bool`
"""
if data:
file_type = [i for i in iter(data) if i in FILE_TYPES]
if file_type:
file_content = data[file_type[0]]
return hasattr(file_content, 'read')
return False