Add --socks-proxy parameter to use socks proxy

This allows the user to specify a socks proxy to
tunnel the connection through.

youtube_dl/YoutubeDL.py

@@ -23,6 +23,12 @@ import sys
 import time
 import traceback
 
+# Try to import socks
+try:
+    import socks
+except ImportError:
+    pass
+
 if os.name == 'nt':
     import ctypes
 
@@ -1825,6 +1831,28 @@ class YoutubeDL(object):
                 proxies['https'] = proxies['http']
         proxy_handler = PerRequestProxyHandler(proxies)
 
+        if 'socks' in sys.modules:  # Check if socks was imported
+            opts_socks = self.params.get('socksproxy')
+
+            print("Socks {}".format(opts_socks))
+            if opts_socks is not None and opts_socks:
+                pair = opts_socks.split(':')
+                if len(pair) == 2:
+                    socks.setdefaultproxy(
+                        socks.PROXY_TYPE_SOCKS5,
+                        pair[0],
+                        int(pair[1]))
+                else:
+                    socks.setdefaultproxy(
+                        socks.PROXY_TYPE_SOCKS5,
+                        'localhost',
+                        int(pair[0]))
+
+                socks.wrapmodule(compat_urllib_request)
+        else:  # Socks was not imported, but the use tried to use it. Tell them
+            if self.params.get('socksproxy'):
+                self.to_stdout("Can't use socks proxy, socks module not found")
+
         debuglevel = 1 if self.params.get('debug_printtraffic') else 0
         https_handler = make_HTTPS_handler(self.params, debuglevel=debuglevel)
         ydlh = YoutubeDLHandler(self.params, debuglevel=debuglevel)

youtube_dl/__init__.py

@@ -346,6 +346,7 @@ def _real_main(argv=None):
         'nocheckcertificate': opts.no_check_certificate,
         'prefer_insecure': opts.prefer_insecure,
         'proxy': opts.proxy,
+        'socksproxy': opts.socksproxy,
         'socket_timeout': opts.socket_timeout,
         'bidi_workaround': opts.bidi_workaround,
         'debug_printtraffic': opts.debug_printtraffic,

youtube_dl/options.py

@@ -181,6 +181,10 @@ def parseOpts(overrideArguments=None):
         '--proxy', dest='proxy',
         default=None, metavar='URL',
         help='Use the specified HTTP/HTTPS proxy. Pass in an empty string (--proxy "") for direct connection')
+    network.add_option(
+        '--socks-proxy', dest='socksproxy', default=None, metavar='URL',
+        help=('Use the specified socks proxy. Pass in an empty string '
+              '(--socks-proxy "") for direct connection'))
     network.add_option(
         '--socket-timeout',
         dest='socket_timeout', type=float, default=None, metavar='SECONDS',