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https://github.com/python-telegram-bot/python-telegram-bot.git
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249 lines
6.6 KiB
Python
249 lines
6.6 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) 2015-2016
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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 methods to make POST and GET requests"""
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import json
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import os
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import socket
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import logging
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import certifi
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import urllib3
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from urllib3.connection import HTTPConnection
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from telegram import (InputFile, TelegramError)
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from telegram.error import Unauthorized, NetworkError, TimedOut, BadRequest
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_CON_POOL = None
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""":type: urllib3.PoolManager"""
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_CON_POOL_PROXY = None
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_CON_POOL_PROXY_KWARGS = {}
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CON_POOL_SIZE = 1
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logging.getLogger('urllib3').setLevel(logging.WARNING)
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def _get_con_pool():
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if _CON_POOL is not None:
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return _CON_POOL
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_init_con_pool()
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return _CON_POOL
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def _init_con_pool():
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global _CON_POOL
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kwargs = dict(maxsize=CON_POOL_SIZE,
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cert_reqs='CERT_REQUIRED',
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ca_certs=certifi.where(),
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socket_options=HTTPConnection.default_socket_options + [
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(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
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])
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proxy_url = _get_con_pool_proxy()
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if not proxy_url:
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mgr = urllib3.PoolManager
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else:
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kwargs['proxy_url'] = proxy_url
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if _CON_POOL_PROXY_KWARGS:
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kwargs.update(_CON_POOL_PROXY_KWARGS)
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mgr = urllib3.ProxyManager
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_CON_POOL = mgr(**kwargs)
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def is_con_pool_initialized():
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return _CON_POOL is not None
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def stop_con_pool():
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global _CON_POOL
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if _CON_POOL is not None:
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_CON_POOL.clear()
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_CON_POOL = None
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def set_con_pool_proxy(url, **urllib3_kwargs):
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"""Setup connection pool behind a proxy
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Args:
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url (str): The URL to the proxy server. For example: `http://127.0.0.1:3128`
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urllib3_kwargs (dict): Arbitrary arguments passed as-is to `urllib3.ProxyManager`
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"""
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global _CON_POOL_PROXY
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global _CON_POOL_PROXY_KWARGS
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if is_con_pool_initialized():
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raise TelegramError('conpool already initialized')
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_CON_POOL_PROXY = url
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_CON_POOL_PROXY_KWARGS = urllib3_kwargs
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def _get_con_pool_proxy():
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"""Return the user configured proxy according to the following order:
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* proxy configured using `set_con_pool_proxy()`.
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* proxy set in `HTTPS_PROXY` env. var.
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* proxy set in `https_proxy` env. var.
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* None (if no proxy is configured)
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Returns:
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str | None
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"""
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if _CON_POOL_PROXY:
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return _CON_POOL_PROXY
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from_env = os.environ.get('HTTPS_PROXY')
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if from_env:
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return from_env
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from_env = os.environ.get('https_proxy')
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if from_env:
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return from_env
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return None
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def _parse(json_data):
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"""Try and parse the JSON returned from Telegram.
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Returns:
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dict: A JSON parsed as Python dict with results - on error this dict will be empty.
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"""
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decoded_s = json_data.decode('utf-8')
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try:
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data = json.loads(decoded_s)
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except ValueError:
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raise TelegramError('Invalid server response')
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if not data.get('ok') and data.get('description'):
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return data['description']
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return data['result']
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def _request_wrapper(*args, **kwargs):
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"""Wraps urllib3 request for handling known exceptions.
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Args:
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args: unnamed arguments, passed to urllib3 request.
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kwargs: keyword arguments, passed tp urllib3 request.
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Returns:
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str: A non-parsed JSON text.
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Raises:
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TelegramError
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"""
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try:
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resp = _get_con_pool().request(*args, **kwargs)
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except urllib3.exceptions.TimeoutError as error:
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raise TimedOut()
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except urllib3.exceptions.HTTPError as error:
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# HTTPError must come last as its the base urllib3 exception class
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# TODO: do something smart here; for now just raise NetworkError
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raise NetworkError('urllib3 HTTPError {0}'.format(error))
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if 200 <= resp.status <= 299:
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# 200-299 range are HTTP success statuses
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return resp.data
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try:
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message = _parse(resp.data)
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except ValueError:
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raise NetworkError('Unknown HTTPError {0}'.format(resp.status))
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if resp.status in (401, 403):
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raise Unauthorized()
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elif resp.status == 400:
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raise BadRequest(repr(message))
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elif resp.status == 502:
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raise NetworkError('Bad Gateway')
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else:
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raise NetworkError('{0} ({1})'.format(message, resp.status))
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def get(url):
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"""Request an URL.
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Args:
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url:
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The web location we want to retrieve.
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Returns:
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A JSON object.
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"""
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result = _request_wrapper('GET', url)
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return _parse(result)
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def post(url, data, timeout=None):
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"""Request an URL.
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Args:
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url:
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The web location we want to retrieve.
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data:
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A dict of (str, unicode) key/value pairs.
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timeout:
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float. If this value is specified, use it as the definitive timeout (in
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seconds) for urlopen() operations. [Optional]
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Notes:
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If neither `timeout` nor `data['timeout']` is specified. The underlying
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defaults are used.
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Returns:
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A JSON object.
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"""
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urlopen_kwargs = {}
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if timeout is not None:
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urlopen_kwargs['timeout'] = timeout
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if InputFile.is_inputfile(data):
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data = InputFile(data)
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result = _request_wrapper('POST', url, body=data.to_form(), headers=data.headers)
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else:
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data = json.dumps(data)
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result = _request_wrapper('POST',
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url,
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body=data.encode(),
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headers={'Content-Type': 'application/json'},
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**urlopen_kwargs)
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return _parse(result)
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def download(url, filename):
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"""Download a file by its URL.
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Args:
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url:
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The web location we want to retrieve.
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filename:
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The filename within the path to download the file.
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"""
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buf = _request_wrapper('GET', url)
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with open(filename, 'wb') as fobj:
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fobj.write(buf)
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