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//opt/alt/python27/lib/python2.7/site-packages/urllib3/contrib/socks.py

# -*- coding: utf-8 -*-
"""
SOCKS support for urllib3
~~~~~~~~~~~~~~~~~~~~~~~~~

This contrib module contains provisional support for SOCKS proxies from within
urllib3. This module supports SOCKS4 (specifically the SOCKS4A variant) and
SOCKS5. To enable its functionality, either install PySocks or install this
module with the ``socks`` extra.

Known Limitations:

- Currently PySocks does not support contacting remote websites via literal
  IPv6 addresses. Any such connection attempt will fail.
- Currently PySocks does not support IPv6 connections to the SOCKS proxy. Any
  such connection attempt will fail.
"""
from __future__ import absolute_import

try:
    import socks
except ImportError:
    import warnings
    from ..exceptions import DependencyWarning

warnings.warn((
        'SOCKS support in urllib3 requires the installation of optional '
        'dependencies: specifically, PySocks.  For more information, see '
        'https://urllib3.readthedocs.org/en/latest/contrib.html#socks-proxies'
        ),
        DependencyWarning
    )
    raise

from socket import error as SocketError, timeout as SocketTimeout

from ..connection import (
    HTTPConnection, HTTPSConnection
)
from ..connectionpool import (
    HTTPConnectionPool, HTTPSConnectionPool
)
from ..exceptions import ConnectTimeoutError, NewConnectionError
from ..poolmanager import PoolManager
from ..util.url import parse_url

try:
    import ssl
except ImportError:
    ssl = None

class SOCKSConnection(HTTPConnection):
    """
    A plain-text HTTP connection that connects via a SOCKS proxy.
    """
    def __init__(self, *args, **kwargs):
        self._socks_options = kwargs.pop('_socks_options')
        super(SOCKSConnection, self).__init__(*args, **kwargs)

def _new_conn(self):
        """
        Establish a new connection via the SOCKS proxy.
        """
        extra_kw = {}
        if self.source_address:
            extra_kw['source_address'] = self.source_address

if self.socket_options:
            extra_kw['socket_options'] = self.socket_options

try:
            conn = socks.create_connection(
                (self.host, self.port),
                proxy_type=self._socks_options['socks_version'],
                proxy_addr=self._socks_options['proxy_host'],
                proxy_port=self._socks_options['proxy_port'],
                proxy_username=self._socks_options['username'],
                proxy_password=self._socks_options['password'],
                timeout=self.timeout,
                **extra_kw
            )

except SocketTimeout as e:
            raise ConnectTimeoutError(
                self, "Connection to %s timed out. (connect timeout=%s)" %
                (self.host, self.timeout))

except socks.ProxyError as e:
            # This is fragile as hell, but it seems to be the only way to raise
            # useful errors here.
            if e.socket_err:
                error = e.socket_err
                if isinstance(error, SocketTimeout):
                    raise ConnectTimeoutError(
                        self,
                        "Connection to %s timed out. (connect timeout=%s)" %
                        (self.host, self.timeout)
                    )
                else:
                    raise NewConnectionError(
                        self,
                        "Failed to establish a new connection: %s" % error
                    )
            else:
                raise NewConnectionError(
                    self,
                    "Failed to establish a new connection: %s" % e
                )

except SocketError as e:  # Defensive: PySocks should catch all these.
            raise NewConnectionError(
                self, "Failed to establish a new connection: %s" % e)

return conn

# We don't need to duplicate the Verified/Unverified distinction from
# urllib3/connection.py here because the HTTPSConnection will already have been
# correctly set to either the Verified or Unverified form by that module. This
# means the SOCKSHTTPSConnection will automatically be the correct type.
class SOCKSHTTPSConnection(SOCKSConnection, HTTPSConnection):
    pass

class SOCKSHTTPConnectionPool(HTTPConnectionPool):
    ConnectionCls = SOCKSConnection

class SOCKSHTTPSConnectionPool(HTTPSConnectionPool):
    ConnectionCls = SOCKSHTTPSConnection

class SOCKSProxyManager(PoolManager):
    """
    A version of the urllib3 ProxyManager that routes connections via the
    defined SOCKS proxy.
    """
    pool_classes_by_scheme = {
        'http': SOCKSHTTPConnectionPool,
        'https': SOCKSHTTPSConnectionPool,
    }

def __init__(self, proxy_url, username=None, password=None,
                 num_pools=10, headers=None, **connection_pool_kw):
        parsed = parse_url(proxy_url)

if parsed.scheme == 'socks5':
            socks_version = socks.PROXY_TYPE_SOCKS5
        elif parsed.scheme == 'socks4':
            socks_version = socks.PROXY_TYPE_SOCKS4
        else:
            raise ValueError(
                "Unable to determine SOCKS version from %s" % proxy_url
            )

self.proxy_url = proxy_url

socks_options = {
            'socks_version': socks_version,
            'proxy_host': parsed.host,
            'proxy_port': parsed.port,
            'username': username,
            'password': password,
        }
        connection_pool_kw['_socks_options'] = socks_options

super(SOCKSProxyManager, self).__init__(
            num_pools, headers, **connection_pool_kw
        )

self.pool_classes_by_scheme = SOCKSProxyManager.pool_classes_by_scheme