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2026-02-04 05:46:23 -06:00 · 2024-10-30 11:19:09 -03:00
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@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+"""
+requests-toolbelt.adapters
+==========================
+
+See https://toolbelt.readthedocs.io/ for documentation
+
+:copyright: (c) 2014 by Ian Cordasco and Cory Benfield
+:license: Apache v2.0, see LICENSE for more details
+"""
+
+from .ssl import SSLAdapter
+from .source import SourceAddressAdapter
+
+__all__ = ['SSLAdapter', 'SourceAddressAdapter']
@@ -0,0 +1,206 @@
+# -*- coding: utf-8 -*-
+"""The App Engine Transport Adapter for requests.
+
+.. versionadded:: 0.6.0
+
+This requires a version of requests >= 2.10.0 and Python 2.
+
+There are two ways to use this library:
+
+#. If you're using requests directly, you can use code like:
+
+   .. code-block:: python
+
+       >>> import requests
+       >>> import ssl
+       >>> import requests.packages.urllib3.contrib.appengine as ul_appengine
+       >>> from requests_toolbelt.adapters import appengine
+       >>> s = requests.Session()
+       >>> if ul_appengine.is_appengine_sandbox():
+       ...    s.mount('http://', appengine.AppEngineAdapter())
+       ...    s.mount('https://', appengine.AppEngineAdapter())
+
+#. If you depend on external libraries which use requests, you can use code
+   like:
+
+   .. code-block:: python
+
+       >>> from requests_toolbelt.adapters import appengine
+       >>> appengine.monkeypatch()
+
+which will ensure all requests.Session objects use AppEngineAdapter properly.
+
+You are also able to :ref:`disable certificate validation <insecure_appengine>`
+when monkey-patching.
+"""
+import requests
+import warnings
+from requests import adapters
+from requests import sessions
+
+from .. import exceptions as exc
+from .._compat import gaecontrib
+from .._compat import timeout
+
+
+class AppEngineMROHack(adapters.HTTPAdapter):
+    """Resolves infinite recursion when monkeypatching.
+
+    This works by injecting itself as the base class of both the
+    :class:`AppEngineAdapter` and Requests' default HTTPAdapter, which needs to
+    be done because default HTTPAdapter's MRO is recompiled when we
+    monkeypatch, at which point this class becomes HTTPAdapter's base class.
+    In addition, we use an instantiation flag to avoid infinite recursion.
+    """
+    _initialized = False
+
+    def __init__(self, *args, **kwargs):
+        if not self._initialized:
+            self._initialized = True
+            super(AppEngineMROHack, self).__init__(*args, **kwargs)
+
+
+class AppEngineAdapter(AppEngineMROHack, adapters.HTTPAdapter):
+    """The transport adapter for Requests to use urllib3's GAE support.
+
+    Implements Requests's HTTPAdapter API.
+
+    When deploying to Google's App Engine service, some of Requests'
+    functionality is broken. There is underlying support for GAE in urllib3.
+    This functionality, however, is opt-in and needs to be enabled explicitly
+    for Requests to be able to use it.
+    """
+
+    __attrs__ = adapters.HTTPAdapter.__attrs__ + ['_validate_certificate']
+
+    def __init__(self, validate_certificate=True, *args, **kwargs):
+        _check_version()
+        self._validate_certificate = validate_certificate
+        super(AppEngineAdapter, self).__init__(*args, **kwargs)
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        self.poolmanager = _AppEnginePoolManager(self._validate_certificate)
+
+
+class InsecureAppEngineAdapter(AppEngineAdapter):
+    """An always-insecure GAE adapter for Requests.
+
+    This is a variant of the the transport adapter for Requests to use
+    urllib3's GAE support that does not validate certificates. Use with
+    caution!
+
+    .. note::
+        The ``validate_certificate`` keyword argument will not be honored here
+        and is not part of the signature because we always force it to
+        ``False``.
+
+    See :class:`AppEngineAdapter` for further details.
+    """
+
+    def __init__(self, *args, **kwargs):
+        if kwargs.pop("validate_certificate", False):
+            warnings.warn("Certificate validation cannot be specified on the "
+                          "InsecureAppEngineAdapter, but was present. This "
+                          "will be ignored and certificate validation will "
+                          "remain off.", exc.IgnoringGAECertificateValidation)
+
+        super(InsecureAppEngineAdapter, self).__init__(
+            validate_certificate=False, *args, **kwargs)
+
+
+class _AppEnginePoolManager(object):
+    """Implements urllib3's PoolManager API expected by requests.
+
+    While a real PoolManager map hostnames to reusable Connections,
+    AppEngine has no concept of a reusable connection to a host.
+    So instead, this class constructs a small Connection per request,
+    that is returned to the Adapter and used to access the URL.
+    """
+
+    def __init__(self, validate_certificate=True):
+        self.appengine_manager = gaecontrib.AppEngineManager(
+            validate_certificate=validate_certificate)
+
+    def connection_from_url(self, url):
+        return _AppEngineConnection(self.appengine_manager, url)
+
+    def clear(self):
+        pass
+
+
+class _AppEngineConnection(object):
+    """Implements urllib3's HTTPConnectionPool API's urlopen().
+
+    This Connection's urlopen() is called with a host-relative path,
+    so in order to properly support opening the URL, we need to store
+    the full URL when this Connection is constructed from the PoolManager.
+
+    This code wraps AppEngineManager.urlopen(), which exposes a different
+    API than in the original urllib3 urlopen(), and thus needs this adapter.
+    """
+
+    def __init__(self, appengine_manager, url):
+        self.appengine_manager = appengine_manager
+        self.url = url
+
+    def urlopen(self, method, url, body=None, headers=None, retries=None,
+                redirect=True, assert_same_host=True,
+                timeout=timeout.Timeout.DEFAULT_TIMEOUT,
+                pool_timeout=None, release_conn=None, **response_kw):
+        # This function's url argument is a host-relative URL,
+        # but the AppEngineManager expects an absolute URL.
+        # So we saved out the self.url when the AppEngineConnection
+        # was constructed, which we then can use down below instead.
+
+        # We once tried to verify our assumptions here, but sometimes the
+        # passed-in URL differs on url fragments, or "http://a.com" vs "/".
+
+        # urllib3's App Engine adapter only uses Timeout.total, not read or
+        # connect.
+        if not timeout.total:
+            timeout.total = timeout._read or timeout._connect
+
+        # Jump through the hoops necessary to call AppEngineManager's API.
+        return self.appengine_manager.urlopen(
+            method,
+            self.url,
+            body=body,
+            headers=headers,
+            retries=retries,
+            redirect=redirect,
+            timeout=timeout,
+            **response_kw)
+
+
+def monkeypatch(validate_certificate=True):
+    """Sets up all Sessions to use AppEngineAdapter by default.
+
+    If you don't want to deal with configuring your own Sessions,
+    or if you use libraries that use requests directly (ie requests.post),
+    then you may prefer to monkeypatch and auto-configure all Sessions.
+
+    .. warning: :
+
+        If ``validate_certificate`` is ``False``, certification validation will
+        effectively be disabled for all requests.
+    """
+    _check_version()
+    # HACK: We should consider modifying urllib3 to support this cleanly,
+    # so that we can set a module-level variable in the sessions module,
+    # instead of overriding an imported HTTPAdapter as is done here.
+    adapter = AppEngineAdapter
+    if not validate_certificate:
+        adapter = InsecureAppEngineAdapter
+
+    sessions.HTTPAdapter = adapter
+    adapters.HTTPAdapter = adapter
+
+
+def _check_version():
+    if gaecontrib is None:
+        raise exc.VersionMismatchError(
+            "The toolbelt requires at least Requests 2.10.0 to be "
+            "installed. Version {} was found instead.".format(
+                requests.__version__
+            )
+        )
@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+"""Submodule containing the implementation for the FingerprintAdapter.
+
+This file contains an implementation of a Transport Adapter that validates
+the fingerprints of SSL certificates presented upon connection.
+"""
+from requests.adapters import HTTPAdapter
+
+from .._compat import poolmanager
+
+
+class FingerprintAdapter(HTTPAdapter):
+    """
+    A HTTPS Adapter for Python Requests that verifies certificate fingerprints,
+    instead of certificate hostnames.
+
+    Example usage:
+
+    .. code-block:: python
+
+        import requests
+        import ssl
+        from requests_toolbelt.adapters.fingerprint import FingerprintAdapter
+
+        twitter_fingerprint = '...'
+        s = requests.Session()
+        s.mount(
+            'https://twitter.com',
+            FingerprintAdapter(twitter_fingerprint)
+        )
+
+    The fingerprint should be provided as a hexadecimal string, optionally
+    containing colons.
+    """
+
+    __attrs__ = HTTPAdapter.__attrs__ + ['fingerprint']
+
+    def __init__(self, fingerprint, **kwargs):
+        self.fingerprint = fingerprint
+
+        super(FingerprintAdapter, self).__init__(**kwargs)
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        self.poolmanager = poolmanager.PoolManager(
+            num_pools=connections,
+            maxsize=maxsize,
+            block=block,
+            assert_fingerprint=self.fingerprint)
@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+"""
+requests_toolbelt.adapters.host_header_ssl
+==========================================
+
+This file contains an implementation of the HostHeaderSSLAdapter.
+"""
+
+from requests.adapters import HTTPAdapter
+
+
+class HostHeaderSSLAdapter(HTTPAdapter):
+    """
+    A HTTPS Adapter for Python Requests that sets the hostname for certificate
+    verification based on the Host header.
+
+    This allows requesting the IP address directly via HTTPS without getting
+    a "hostname doesn't match" exception.
+
+    Example usage:
+
+        >>> s.mount('https://', HostHeaderSSLAdapter())
+        >>> s.get("https://93.184.216.34", headers={"Host": "example.org"})
+
+    """
+
+    def send(self, request, **kwargs):
+        # HTTP headers are case-insensitive (RFC 7230)
+        host_header = None
+        for header in request.headers:
+            if header.lower() == "host":
+                host_header = request.headers[header]
+                break
+
+        connection_pool_kwargs = self.poolmanager.connection_pool_kw
+
+        if host_header:
+            connection_pool_kwargs["assert_hostname"] = host_header
+        elif "assert_hostname" in connection_pool_kwargs:
+            # an assert_hostname from a previous request may have been left
+            connection_pool_kwargs.pop("assert_hostname", None)
+
+        return super(HostHeaderSSLAdapter, self).send(request, **kwargs)
@@ -0,0 +1,129 @@
+# -*- coding: utf-8 -*-
+"""The implementation of the SocketOptionsAdapter."""
+import socket
+import warnings
+import sys
+
+import requests
+from requests import adapters
+
+from .._compat import connection
+from .._compat import poolmanager
+from .. import exceptions as exc
+
+
+class SocketOptionsAdapter(adapters.HTTPAdapter):
+    """An adapter for requests that allows users to specify socket options.
+
+    Since version 2.4.0 of requests, it is possible to specify a custom list
+    of socket options that need to be set before establishing the connection.
+
+    Example usage::
+
+        >>> import socket
+        >>> import requests
+        >>> from requests_toolbelt.adapters import socket_options
+        >>> s = requests.Session()
+        >>> opts = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 0)]
+        >>> adapter = socket_options.SocketOptionsAdapter(socket_options=opts)
+        >>> s.mount('http://', adapter)
+
+    You can also take advantage of the list of default options on this class
+    to keep using the original options in addition to your custom options. In
+    that case, ``opts`` might look like::
+
+        >>> opts = socket_options.SocketOptionsAdapter.default_options + opts
+
+    """
+
+    if connection is not None:
+        default_options = getattr(
+            connection.HTTPConnection,
+            'default_socket_options',
+            [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]
+        )
+    else:
+        default_options = []
+        warnings.warn(exc.RequestsVersionTooOld,
+                      "This version of Requests is only compatible with a "
+                      "version of urllib3 which is too old to support "
+                      "setting options on a socket. This adapter is "
+                      "functionally useless.")
+
+    def __init__(self, **kwargs):
+        self.socket_options = kwargs.pop('socket_options',
+                                         self.default_options)
+
+        super(SocketOptionsAdapter, self).__init__(**kwargs)
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        if requests.__build__ >= 0x020400:
+            # NOTE(Ian): Perhaps we should raise a warning
+            self.poolmanager = poolmanager.PoolManager(
+                num_pools=connections,
+                maxsize=maxsize,
+                block=block,
+                socket_options=self.socket_options
+            )
+        else:
+            super(SocketOptionsAdapter, self).init_poolmanager(
+                connections, maxsize, block
+            )
+
+
+class TCPKeepAliveAdapter(SocketOptionsAdapter):
+    """An adapter for requests that turns on TCP Keep-Alive by default.
+
+    The adapter sets 4 socket options:
+
+    - ``SOL_SOCKET`` ``SO_KEEPALIVE`` - This turns on TCP Keep-Alive
+    - ``IPPROTO_TCP`` ``TCP_KEEPINTVL`` 20 - Sets the keep alive interval
+    - ``IPPROTO_TCP`` ``TCP_KEEPCNT`` 5 - Sets the number of keep alive probes
+    - ``IPPROTO_TCP`` ``TCP_KEEPIDLE`` 60 - Sets the keep alive time if the
+      socket library has the ``TCP_KEEPIDLE`` constant
+
+    The latter three can be overridden by keyword arguments (respectively):
+
+    - ``interval``
+    - ``count``
+    - ``idle``
+
+    You can use this adapter like so::
+
+       >>> from requests_toolbelt.adapters import socket_options
+       >>> tcp = socket_options.TCPKeepAliveAdapter(idle=120, interval=10)
+       >>> s = requests.Session()
+       >>> s.mount('http://', tcp)
+
+    """
+
+    def __init__(self, **kwargs):
+        socket_options = kwargs.pop('socket_options',
+                                    SocketOptionsAdapter.default_options)
+        idle = kwargs.pop('idle', 60)
+        interval = kwargs.pop('interval', 20)
+        count = kwargs.pop('count', 5)
+        socket_options = socket_options + [
+            (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
+        ]
+
+        # NOTE(Ian): OSX does not have these constants defined, so we
+        # set them conditionally.
+        if getattr(socket, 'TCP_KEEPINTVL', None) is not None:
+            socket_options += [(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL,
+                                interval)]
+        elif sys.platform == 'darwin':
+            # On OSX, TCP_KEEPALIVE from netinet/tcp.h is not exported
+            # by python's socket module
+            TCP_KEEPALIVE = getattr(socket, 'TCP_KEEPALIVE', 0x10)
+            socket_options += [(socket.IPPROTO_TCP, TCP_KEEPALIVE, interval)]
+
+        if getattr(socket, 'TCP_KEEPCNT', None) is not None:
+            socket_options += [(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, count)]
+
+        if getattr(socket, 'TCP_KEEPIDLE', None) is not None:
+            socket_options += [(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, idle)]
+
+        super(TCPKeepAliveAdapter, self).__init__(
+            socket_options=socket_options, **kwargs
+        )
@@ -0,0 +1,67 @@
+# -*- coding: utf-8 -*-
+"""
+requests_toolbelt.source_adapter
+================================
+
+This file contains an implementation of the SourceAddressAdapter originally
+demonstrated on the Requests GitHub page.
+"""
+from requests.adapters import HTTPAdapter
+
+from .._compat import poolmanager, basestring
+
+
+class SourceAddressAdapter(HTTPAdapter):
+    """
+    A Source Address Adapter for Python Requests that enables you to choose the
+    local address to bind to. This allows you to send your HTTP requests from a
+    specific interface and IP address.
+
+    Two address formats are accepted. The first is a string: this will set the
+    local IP address to the address given in the string, and will also choose a
+    semi-random high port for the local port number.
+
+    The second is a two-tuple of the form (ip address, port): for example,
+    ``('10.10.10.10', 8999)``. This will set the local IP address to the first
+    element, and the local port to the second element. If ``0`` is used as the
+    port number, a semi-random high port will be selected.
+
+    .. warning:: Setting an explicit local port can have negative interactions
+                 with connection-pooling in Requests: in particular, it risks
+                 the possibility of getting "Address in use" errors. The
+                 string-only argument is generally preferred to the tuple-form.
+
+    Example usage:
+
+    .. code-block:: python
+
+        import requests
+        from requests_toolbelt.adapters.source import SourceAddressAdapter
+
+        s = requests.Session()
+        s.mount('http://', SourceAddressAdapter('10.10.10.10'))
+        s.mount('https://', SourceAddressAdapter(('10.10.10.10', 8999)))
+    """
+    def __init__(self, source_address, **kwargs):
+        if isinstance(source_address, basestring):
+            self.source_address = (source_address, 0)
+        elif isinstance(source_address, tuple):
+            self.source_address = source_address
+        else:
+            raise TypeError(
+                "source_address must be IP address string or (ip, port) tuple"
+            )
+
+        super(SourceAddressAdapter, self).__init__(**kwargs)
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        self.poolmanager = poolmanager.PoolManager(
+            num_pools=connections,
+            maxsize=maxsize,
+            block=block,
+            source_address=self.source_address)
+
+    def proxy_manager_for(self, *args, **kwargs):
+        kwargs['source_address'] = self.source_address
+        return super(SourceAddressAdapter, self).proxy_manager_for(
+            *args, **kwargs)
@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -*-
+"""
+
+requests_toolbelt.ssl_adapter
+=============================
+
+This file contains an implementation of the SSLAdapter originally demonstrated
+in this blog post:
+https://lukasa.co.uk/2013/01/Choosing_SSL_Version_In_Requests/
+
+"""
+import requests
+
+from requests.adapters import HTTPAdapter
+
+from .._compat import poolmanager
+
+
+class SSLAdapter(HTTPAdapter):
+    """
+    A HTTPS Adapter for Python Requests that allows the choice of the SSL/TLS
+    version negotiated by Requests. This can be used either to enforce the
+    choice of high-security TLS versions (where supported), or to work around
+    misbehaving servers that fail to correctly negotiate the default TLS
+    version being offered.
+
+    Example usage:
+
+        >>> import requests
+        >>> import ssl
+        >>> from requests_toolbelt import SSLAdapter
+        >>> s = requests.Session()
+        >>> s.mount('https://', SSLAdapter(ssl.PROTOCOL_TLSv1))
+
+    You can replace the chosen protocol with any that are available in the
+    default Python SSL module. All subsequent requests that match the adapter
+    prefix will use the chosen SSL version instead of the default.
+
+    This adapter will also attempt to change the SSL/TLS version negotiated by
+    Requests when using a proxy. However, this may not always be possible:
+    prior to Requests v2.4.0 the adapter did not have access to the proxy setup
+    code. In earlier versions of Requests, this adapter will not function
+    properly when used with proxies.
+    """
+
+    __attrs__ = HTTPAdapter.__attrs__ + ['ssl_version']
+
+    def __init__(self, ssl_version=None, **kwargs):
+        self.ssl_version = ssl_version
+
+        super(SSLAdapter, self).__init__(**kwargs)
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        self.poolmanager = poolmanager.PoolManager(
+            num_pools=connections,
+            maxsize=maxsize,
+            block=block,
+            ssl_version=self.ssl_version)
+
+    if requests.__build__ >= 0x020400:
+        # Earlier versions of requests either don't have this method or, worse,
+        # don't allow passing arbitrary keyword arguments. As a result, only
+        # conditionally define this method.
+        def proxy_manager_for(self, *args, **kwargs):
+            kwargs['ssl_version'] = self.ssl_version
+            return super(SSLAdapter, self).proxy_manager_for(*args, **kwargs)
@@ -0,0 +1,196 @@
+# -*- coding: utf-8 -*-
+"""A X509Adapter for use with the requests library.
+
+This file contains an implementation of the X509Adapter that will
+allow users to authenticate a request using an arbitrary
+X.509 certificate without needing to convert it to a .pem file
+
+"""
+
+from OpenSSL.crypto import PKey, X509
+from cryptography import x509
+from cryptography.hazmat.primitives.serialization import (load_pem_private_key,
+                                                          load_der_private_key)
+from cryptography.hazmat.primitives.serialization import Encoding
+from cryptography.hazmat.backends import default_backend
+
+from datetime import datetime
+from requests.adapters import HTTPAdapter
+import requests
+
+from .. import exceptions as exc
+
+"""
+importing the protocol constants from _ssl instead of ssl because only the
+constants are needed and to handle issues caused by importing from ssl on
+the 2.7.x line.
+"""
+try:
+    from _ssl import PROTOCOL_TLS as PROTOCOL
+except ImportError:
+    from _ssl import PROTOCOL_SSLv23 as PROTOCOL
+
+
+PyOpenSSLContext = None
+
+
+class X509Adapter(HTTPAdapter):
+    r"""Adapter for use with X.509 certificates.
+
+    Provides an interface for Requests sessions to contact HTTPS urls and
+    authenticate  with an X.509 cert by implementing the Transport Adapter
+    interface. This class will need to be manually instantiated and mounted
+    to the session
+
+    :param pool_connections: The number of urllib3 connection pools to
+           cache.
+    :param pool_maxsize: The maximum number of connections to save in the
+            pool.
+    :param max_retries: The maximum number of retries each connection
+        should attempt. Note, this applies only to failed DNS lookups,
+        socket connections and connection timeouts, never to requests where
+        data has made it to the server. By default, Requests does not retry
+        failed connections. If you need granular control over the
+        conditions under which we retry a request, import urllib3's
+        ``Retry`` class and pass that instead.
+    :param pool_block: Whether the connection pool should block for
+            connections.
+
+    :param bytes cert_bytes:
+        bytes object containing contents of a cryptography.x509Certificate
+        object using the encoding specified by the ``encoding`` parameter.
+    :param bytes pk_bytes:
+        bytes object containing contents of a object that implements
+        ``cryptography.hazmat.primitives.serialization.PrivateFormat``
+        using the encoding specified by the ``encoding`` parameter.
+    :param password:
+        string or utf8 encoded bytes containing the passphrase used for the
+        private key. None if unencrypted. Defaults to None.
+    :param encoding:
+        Enumeration detailing the encoding method used on the ``cert_bytes``
+        parameter. Can be either PEM or DER. Defaults to PEM.
+    :type encoding:
+        :class: `cryptography.hazmat.primitives.serialization.Encoding`
+
+    Usage::
+
+      >>> import requests
+      >>> from requests_toolbelt.adapters.x509 import X509Adapter
+      >>> s = requests.Session()
+      >>> a = X509Adapter(max_retries=3,
+                cert_bytes=b'...', pk_bytes=b'...', encoding='...'
+      >>> s.mount('https://', a)
+    """
+
+    def __init__(self, *args, **kwargs):
+        self._import_pyopensslcontext()
+        self._check_version()
+        cert_bytes = kwargs.pop('cert_bytes', None)
+        pk_bytes = kwargs.pop('pk_bytes', None)
+        password = kwargs.pop('password', None)
+        encoding = kwargs.pop('encoding', Encoding.PEM)
+
+        password_bytes = None
+
+        if cert_bytes is None or not isinstance(cert_bytes, bytes):
+            raise ValueError('Invalid cert content provided. '
+                             'You must provide an X.509 cert '
+                             'formatted as a byte array.')
+        if pk_bytes is None or not isinstance(pk_bytes, bytes):
+            raise ValueError('Invalid private key content provided. '
+                             'You must provide a private key '
+                             'formatted as a byte array.')
+
+        if isinstance(password, bytes):
+            password_bytes = password
+        elif password:
+            password_bytes = password.encode('utf8')
+
+        self.ssl_context = create_ssl_context(cert_bytes, pk_bytes,
+                                              password_bytes, encoding)
+
+        super(X509Adapter, self).__init__(*args, **kwargs)
+
+    def init_poolmanager(self, *args, **kwargs):
+        if self.ssl_context:
+            kwargs['ssl_context'] = self.ssl_context
+        return super(X509Adapter, self).init_poolmanager(*args, **kwargs)
+
+    def proxy_manager_for(self, *args, **kwargs):
+        if self.ssl_context:
+            kwargs['ssl_context'] = self.ssl_context
+        return super(X509Adapter, self).proxy_manager_for(*args, **kwargs)
+
+    def _import_pyopensslcontext(self):
+        global PyOpenSSLContext
+
+        if requests.__build__ < 0x021200:
+            PyOpenSSLContext = None
+        else:
+            try:
+                from requests.packages.urllib3.contrib.pyopenssl \
+                        import PyOpenSSLContext
+            except ImportError:
+                try:
+                    from urllib3.contrib.pyopenssl import PyOpenSSLContext
+                except ImportError:
+                    PyOpenSSLContext = None
+
+    def _check_version(self):
+        if PyOpenSSLContext is None:
+            raise exc.VersionMismatchError(
+                "The X509Adapter requires at least Requests 2.12.0 to be "
+                "installed. Version {} was found instead.".format(
+                    requests.__version__
+                )
+            )
+
+
+def check_cert_dates(cert):
+    """Verify that the supplied client cert is not invalid."""
+
+    now = datetime.utcnow()
+    if cert.not_valid_after < now or cert.not_valid_before > now:
+        raise ValueError('Client certificate expired: Not After: '
+                         '{:%Y-%m-%d %H:%M:%SZ} '
+                         'Not Before: {:%Y-%m-%d %H:%M:%SZ}'
+                         .format(cert.not_valid_after, cert.not_valid_before))
+
+
+def create_ssl_context(cert_byes, pk_bytes, password=None,
+                       encoding=Encoding.PEM):
+    """Create an SSL Context with the supplied cert/password.
+
+    :param cert_bytes array of bytes containing the cert encoded
+           using the method supplied in the ``encoding`` parameter
+    :param pk_bytes array of bytes containing the private key encoded
+           using the method supplied in the ``encoding`` parameter
+    :param password array of bytes containing the passphrase to be used
+           with the supplied private key. None if unencrypted.
+           Defaults to None.
+    :param encoding ``cryptography.hazmat.primitives.serialization.Encoding``
+            details the encoding method used on the ``cert_bytes``  and
+            ``pk_bytes`` parameters. Can be either PEM or DER.
+            Defaults to PEM.
+    """
+    backend = default_backend()
+
+    cert = None
+    key = None
+    if encoding == Encoding.PEM:
+        cert = x509.load_pem_x509_certificate(cert_byes, backend)
+        key = load_pem_private_key(pk_bytes, password, backend)
+    elif encoding == Encoding.DER:
+        cert = x509.load_der_x509_certificate(cert_byes, backend)
+        key = load_der_private_key(pk_bytes, password, backend)
+    else:
+        raise ValueError('Invalid encoding provided: Must be PEM or DER')
+
+    if not (cert and key):
+        raise ValueError('Cert and key could not be parsed from '
+                         'provided data')
+    check_cert_dates(cert)
+    ssl_context = PyOpenSSLContext(PROTOCOL)
+    ssl_context._ctx.use_certificate(X509.from_cryptography(cert))
+    ssl_context._ctx.use_privatekey(PKey.from_cryptography_key(key))
+    return ssl_context