Add support for Socks5 proxy. (#518)

setup.py

@@ -36,6 +36,7 @@ with codecs.open('README.rst', 'r', 'utf-8') as fd:
           install_requires=requirements(),
           extras_require={
               'json': 'ujson',
+              'socks': 'PySocks'
           },
           include_package_data=True,
           classifiers=[

telegram/utils/request.py

@@ -30,6 +30,10 @@ import certifi
 import urllib3
 from urllib3.connection import HTTPConnection
 from urllib3.util.timeout import Timeout
+try:
+    from urllib3.contrib.socks import SOCKSProxyManager
+except ImportError:
+    SOCKSProxyManager = None
 
 from telegram import (InputFile, TelegramError)
 from telegram.error import (Unauthorized, NetworkError, TimedOut, BadRequest, ChatMigrated,
@@ -92,6 +96,11 @@ class Request(object):
             mgr = urllib3.PoolManager(**kwargs)
         else:
             kwargs.update(urllib3_proxy_kwargs)
+            if proxy_url.startswith('socks'):
+                if not SOCKSProxyManager:
+                    raise RuntimeError('PySocks is missing')
+                mgr = SOCKSProxyManager(proxy_url, **kwargs)
+            else:
                 mgr = urllib3.proxy_from_url(proxy_url, **kwargs)
                 if mgr.proxy.auth:
                     # TODO: what about other auth types?