Remove windows python distribution from repo and add requirements.txt

1 files changed, 0 insertions, 714 deletions

diff --git a/python/gevent/_sslgte279.py b/python/gevent/_sslgte279.py
deleted file mode 100644
index 5580762..0000000
--- a/python/gevent/_sslgte279.py
+++ /dev/null
@@ -1,714 +0,0 @@
-# Wrapper module for _ssl. Written by Bill Janssen.
-# Ported to gevent by Denis Bilenko.
-"""SSL wrapper for socket objects on Python 2.7.9 and above.
-
-For the documentation, refer to :mod:`ssl` module manual.
-
-This module implements cooperative SSL socket wrappers.
-"""
-
-from __future__ import absolute_import
-# Our import magic sadly makes this warning useless
-# pylint: disable=undefined-variable
-# pylint: disable=too-many-instance-attributes,too-many-locals,too-many-statements,too-many-branches
-# pylint: disable=arguments-differ,too-many-public-methods
-
-import ssl as __ssl__
-
-_ssl = __ssl__._ssl # pylint:disable=no-member
-
-import errno
-from gevent._socket2 import socket
-from gevent.socket import timeout_default
-from gevent.socket import create_connection
-from gevent.socket import error as socket_error
-from gevent.socket import timeout as _socket_timeout
-from gevent._compat import PYPY
-from gevent._util import copy_globals
-
-__implements__ = [
-    'SSLContext',
-    'SSLSocket',
-    'wrap_socket',
-    'get_server_certificate',
-    'create_default_context',
-    '_create_unverified_context',
-    '_create_default_https_context',
-    '_create_stdlib_context',
-]
-
-# Import all symbols from Python's ssl.py, except those that we are implementing
-# and "private" symbols.
-__imports__ = copy_globals(__ssl__, globals(),
-                           # SSLSocket *must* subclass gevent.socket.socket; see issue 597 and 801
-                           names_to_ignore=__implements__ + ['socket', 'create_connection'],
-                           dunder_names_to_keep=())
-
-try:
-    _delegate_methods
-except NameError: # PyPy doesn't expose this detail
-    _delegate_methods = ('recv', 'recvfrom', 'recv_into', 'recvfrom_into', 'send', 'sendto')
-
-__all__ = __implements__ + __imports__
-if 'namedtuple' in __all__:
-    __all__.remove('namedtuple')
-
-orig_SSLContext = __ssl__.SSLContext # pylint: disable=no-member
-
-
-class SSLContext(orig_SSLContext):
-    def wrap_socket(self, sock, server_side=False,
-                    do_handshake_on_connect=True,
-                    suppress_ragged_eofs=True,
-                    server_hostname=None):
-        return SSLSocket(sock=sock, server_side=server_side,
-                         do_handshake_on_connect=do_handshake_on_connect,
-                         suppress_ragged_eofs=suppress_ragged_eofs,
-                         server_hostname=server_hostname,
-                         _context=self)
-
-
-def create_default_context(purpose=Purpose.SERVER_AUTH, cafile=None,
-                           capath=None, cadata=None):
-    """Create a SSLContext object with default settings.
-
-    NOTE: The protocol and settings may change anytime without prior
-          deprecation. The values represent a fair balance between maximum
-          compatibility and security.
-    """
-    if not isinstance(purpose, _ASN1Object):
-        raise TypeError(purpose)
-
-    context = SSLContext(PROTOCOL_SSLv23)
-
-    # SSLv2 considered harmful.
-    context.options |= OP_NO_SSLv2
-
-    # SSLv3 has problematic security and is only required for really old
-    # clients such as IE6 on Windows XP
-    context.options |= OP_NO_SSLv3
-
-    # disable compression to prevent CRIME attacks (OpenSSL 1.0+)
-    context.options |= getattr(_ssl, "OP_NO_COMPRESSION", 0)
-
-    if purpose == Purpose.SERVER_AUTH:
-        # verify certs and host name in client mode
-        context.verify_mode = CERT_REQUIRED
-        context.check_hostname = True # pylint: disable=attribute-defined-outside-init
-    elif purpose == Purpose.CLIENT_AUTH:
-        # Prefer the server's ciphers by default so that we get stronger
-        # encryption
-        context.options |= getattr(_ssl, "OP_CIPHER_SERVER_PREFERENCE", 0)
-
-        # Use single use keys in order to improve forward secrecy
-        context.options |= getattr(_ssl, "OP_SINGLE_DH_USE", 0)
-        context.options |= getattr(_ssl, "OP_SINGLE_ECDH_USE", 0)
-
-        # disallow ciphers with known vulnerabilities
-        context.set_ciphers(_RESTRICTED_SERVER_CIPHERS)
-
-    if cafile or capath or cadata:
-        context.load_verify_locations(cafile, capath, cadata)
-    elif context.verify_mode != CERT_NONE:
-        # no explicit cafile, capath or cadata but the verify mode is
-        # CERT_OPTIONAL or CERT_REQUIRED. Let's try to load default system
-        # root CA certificates for the given purpose. This may fail silently.
-        context.load_default_certs(purpose)
-    return context
-
-def _create_unverified_context(protocol=PROTOCOL_SSLv23, cert_reqs=None,
-                               check_hostname=False, purpose=Purpose.SERVER_AUTH,
-                               certfile=None, keyfile=None,
-                               cafile=None, capath=None, cadata=None):
-    """Create a SSLContext object for Python stdlib modules
-
-    All Python stdlib modules shall use this function to create SSLContext
-    objects in order to keep common settings in one place. The configuration
-    is less restrict than create_default_context()'s to increase backward
-    compatibility.
-    """
-    if not isinstance(purpose, _ASN1Object):
-        raise TypeError(purpose)
-
-    context = SSLContext(protocol)
-    # SSLv2 considered harmful.
-    context.options |= OP_NO_SSLv2
-    # SSLv3 has problematic security and is only required for really old
-    # clients such as IE6 on Windows XP
-    context.options |= OP_NO_SSLv3
-
-    if cert_reqs is not None:
-        context.verify_mode = cert_reqs
-    context.check_hostname = check_hostname # pylint: disable=attribute-defined-outside-init
-
-    if keyfile and not certfile:
-        raise ValueError("certfile must be specified")
-    if certfile or keyfile:
-        context.load_cert_chain(certfile, keyfile)
-
-    # load CA root certs
-    if cafile or capath or cadata:
-        context.load_verify_locations(cafile, capath, cadata)
-    elif context.verify_mode != CERT_NONE:
-        # no explicit cafile, capath or cadata but the verify mode is
-        # CERT_OPTIONAL or CERT_REQUIRED. Let's try to load default system
-        # root CA certificates for the given purpose. This may fail silently.
-        context.load_default_certs(purpose)
-
-    return context
-
-# Used by http.client if no context is explicitly passed.
-_create_default_https_context = create_default_context
-
-
-# Backwards compatibility alias, even though it's not a public name.
-_create_stdlib_context = _create_unverified_context
-
-class SSLSocket(socket):
-    """
-    gevent `ssl.SSLSocket <https://docs.python.org/2/library/ssl.html#ssl-sockets>`_
-    for Pythons >= 2.7.9 but less than 3.
-    """
-
-    def __init__(self, sock=None, keyfile=None, certfile=None,
-                 server_side=False, cert_reqs=CERT_NONE,
-                 ssl_version=PROTOCOL_SSLv23, ca_certs=None,
-                 do_handshake_on_connect=True,
-                 family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None,
-                 suppress_ragged_eofs=True, npn_protocols=None, ciphers=None,
-                 server_hostname=None,
-                 _context=None):
-        # fileno is ignored
-        # pylint: disable=unused-argument
-        if _context:
-            self._context = _context
-        else:
-            if server_side and not certfile:
-                raise ValueError("certfile must be specified for server-side "
-                                 "operations")
-            if keyfile and not certfile:
-                raise ValueError("certfile must be specified")
-            if certfile and not keyfile:
-                keyfile = certfile
-            self._context = SSLContext(ssl_version)
-            self._context.verify_mode = cert_reqs
-            if ca_certs:
-                self._context.load_verify_locations(ca_certs)
-            if certfile:
-                self._context.load_cert_chain(certfile, keyfile)
-            if npn_protocols:
-                self._context.set_npn_protocols(npn_protocols)
-            if ciphers:
-                self._context.set_ciphers(ciphers)
-            self.keyfile = keyfile
-            self.certfile = certfile
-            self.cert_reqs = cert_reqs
-            self.ssl_version = ssl_version
-            self.ca_certs = ca_certs
-            self.ciphers = ciphers
-        # Can't use sock.type as other flags (such as SOCK_NONBLOCK) get
-        # mixed in.
-        if sock.getsockopt(SOL_SOCKET, SO_TYPE) != SOCK_STREAM:
-            raise NotImplementedError("only stream sockets are supported")
-
-        if PYPY:
-            socket.__init__(self, _sock=sock)
-            sock._drop()
-        else:
-            # CPython: XXX: Must pass the underlying socket, not our
-            # potential wrapper; test___example_servers fails the SSL test
-            # with a client-side EOF error. (Why?)
-            socket.__init__(self, _sock=sock._sock)
-
-        # The initializer for socket overrides the methods send(), recv(), etc.
-        # in the instance, which we don't need -- but we want to provide the
-        # methods defined in SSLSocket.
-        for attr in _delegate_methods:
-            try:
-                delattr(self, attr)
-            except AttributeError:
-                pass
-        if server_side and server_hostname:
-            raise ValueError("server_hostname can only be specified "
-                             "in client mode")
-        if self._context.check_hostname and not server_hostname:
-            raise ValueError("check_hostname requires server_hostname")
-        self.server_side = server_side
-        self.server_hostname = server_hostname
-        self.do_handshake_on_connect = do_handshake_on_connect
-        self.suppress_ragged_eofs = suppress_ragged_eofs
-        self.settimeout(sock.gettimeout())
-
-        # See if we are connected
-        try:
-            self.getpeername()
-        except socket_error as e:
-            if e.errno != errno.ENOTCONN:
-                raise
-            connected = False
-        else:
-            connected = True
-
-        self._makefile_refs = 0
-        self._closed = False
-        self._sslobj = None
-        self._connected = connected
-        if connected:
-            # create the SSL object
-            try:
-                self._sslobj = self._context._wrap_socket(self._sock, server_side,
-                                                          server_hostname, ssl_sock=self)
-                if do_handshake_on_connect:
-                    timeout = self.gettimeout()
-                    if timeout == 0.0:
-                        # non-blocking
-                        raise ValueError("do_handshake_on_connect should not be specified for non-blocking sockets")
-                    self.do_handshake()
-
-            except socket_error as x:
-                self.close()
-                raise x
-
-
-    @property
-    def context(self):
-        return self._context
-
-    @context.setter
-    def context(self, ctx):
-        self._context = ctx
-        self._sslobj.context = ctx
-
-    def dup(self):
-        raise NotImplementedError("Can't dup() %s instances" %
-                                  self.__class__.__name__)
-
-    def _checkClosed(self, msg=None):
-        # raise an exception here if you wish to check for spurious closes
-        pass
-
-    def _check_connected(self):
-        if not self._connected:
-            # getpeername() will raise ENOTCONN if the socket is really
-            # not connected; note that we can be connected even without
-            # _connected being set, e.g. if connect() first returned
-            # EAGAIN.
-            self.getpeername()
-
-    def read(self, len=1024, buffer=None):
-        """Read up to LEN bytes and return them.
-        Return zero-length string on EOF."""
-        self._checkClosed()
-
-        while 1:
-            if not self._sslobj:
-                raise ValueError("Read on closed or unwrapped SSL socket.")
-            if len == 0:
-                return b'' if buffer is None else 0
-            if len < 0 and buffer is None:
-                # This is handled natively in python 2.7.12+
-                raise ValueError("Negative read length")
-            try:
-                if buffer is not None:
-                    return self._sslobj.read(len, buffer)
-                return self._sslobj.read(len or 1024)
-            except SSLWantReadError:
-                if self.timeout == 0.0:
-                    raise
-                self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
-            except SSLWantWriteError:
-                if self.timeout == 0.0:
-                    raise
-                # note: using _SSLErrorReadTimeout rather than _SSLErrorWriteTimeout below is intentional
-                self._wait(self._write_event, timeout_exc=_SSLErrorReadTimeout)
-            except SSLError as ex:
-                if ex.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
-                    if buffer is not None:
-                        return 0
-                    return b''
-                raise
-
-    def write(self, data):
-        """Write DATA to the underlying SSL channel.  Returns
-        number of bytes of DATA actually transmitted."""
-        self._checkClosed()
-
-        while 1:
-            if not self._sslobj:
-                raise ValueError("Write on closed or unwrapped SSL socket.")
-
-            try:
-                return self._sslobj.write(data)
-            except SSLError as ex:
-                if ex.args[0] == SSL_ERROR_WANT_READ:
-                    if self.timeout == 0.0:
-                        raise
-                    self._wait(self._read_event, timeout_exc=_SSLErrorWriteTimeout)
-                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
-                    if self.timeout == 0.0:
-                        raise
-                    self._wait(self._write_event, timeout_exc=_SSLErrorWriteTimeout)
-                else:
-                    raise
-
-    def getpeercert(self, binary_form=False):
-        """Returns a formatted version of the data in the
-        certificate provided by the other end of the SSL channel.
-        Return None if no certificate was provided, {} if a
-        certificate was provided, but not validated."""
-
-        self._checkClosed()
-        self._check_connected()
-        return self._sslobj.peer_certificate(binary_form)
-
-    def selected_npn_protocol(self):
-        self._checkClosed()
-        if not self._sslobj or not _ssl.HAS_NPN:
-            return None
-        return self._sslobj.selected_npn_protocol()
-
-    if hasattr(_ssl, 'HAS_ALPN'):
-        # 2.7.10+
-        def selected_alpn_protocol(self):
-            self._checkClosed()
-            if not self._sslobj or not _ssl.HAS_ALPN: # pylint:disable=no-member
-                return None
-            return self._sslobj.selected_alpn_protocol()
-
-    def cipher(self):
-        self._checkClosed()
-        if not self._sslobj:
-            return None
-        return self._sslobj.cipher()
-
-    def compression(self):
-        self._checkClosed()
-        if not self._sslobj:
-            return None
-        return self._sslobj.compression()
-
-    def __check_flags(self, meth, flags):
-        if flags != 0:
-            raise ValueError(
-                "non-zero flags not allowed in calls to %s on %s" %
-                (meth, self.__class__))
-
-    def send(self, data, flags=0, timeout=timeout_default):
-        self._checkClosed()
-        self.__check_flags('send', flags)
-
-        if timeout is timeout_default:
-            timeout = self.timeout
-
-        if not self._sslobj:
-            return socket.send(self, data, flags, timeout)
-
-        while True:
-            try:
-                return self._sslobj.write(data)
-            except SSLWantReadError:
-                if self.timeout == 0.0:
-                    return 0
-                self._wait(self._read_event)
-            except SSLWantWriteError:
-                if self.timeout == 0.0:
-                    return 0
-                self._wait(self._write_event)
-
-    def sendto(self, data, flags_or_addr, addr=None):
-        self._checkClosed()
-        if self._sslobj:
-            raise ValueError("sendto not allowed on instances of %s" %
-                             self.__class__)
-        elif addr is None:
-            return socket.sendto(self, data, flags_or_addr)
-        else:
-            return socket.sendto(self, data, flags_or_addr, addr)
-
-    def sendmsg(self, *args, **kwargs):
-        # Ensure programs don't send data unencrypted if they try to
-        # use this method.
-        raise NotImplementedError("sendmsg not allowed on instances of %s" %
-                                  self.__class__)
-
-    def sendall(self, data, flags=0):
-        self._checkClosed()
-        self.__check_flags('sendall', flags)
-
-        try:
-            socket.sendall(self, data)
-        except _socket_timeout as ex:
-            if self.timeout == 0.0:
-                # Python 2 simply *hangs* in this case, which is bad, but
-                # Python 3 raises SSLWantWriteError. We do the same.
-                raise SSLWantWriteError("The operation did not complete (write)")
-            # Convert the socket.timeout back to the sslerror
-            raise SSLError(*ex.args)
-
-    def recv(self, buflen=1024, flags=0):
-        self._checkClosed()
-        if self._sslobj:
-            if flags != 0:
-                raise ValueError(
-                    "non-zero flags not allowed in calls to recv() on %s" %
-                    self.__class__)
-            if buflen == 0:
-                return b''
-            return self.read(buflen)
-        return socket.recv(self, buflen, flags)
-
-    def recv_into(self, buffer, nbytes=None, flags=0):
-        self._checkClosed()
-        if buffer is not None and (nbytes is None):
-            # Fix for python bug #23804: bool(bytearray()) is False,
-            # but we should read 0 bytes.
-            nbytes = len(buffer)
-        elif nbytes is None:
-            nbytes = 1024
-        if self._sslobj:
-            if flags != 0:
-                raise ValueError(
-                    "non-zero flags not allowed in calls to recv_into() on %s" %
-                    self.__class__)
-            return self.read(nbytes, buffer)
-        return socket.recv_into(self, buffer, nbytes, flags)
-
-    def recvfrom(self, buflen=1024, flags=0):
-        self._checkClosed()
-        if self._sslobj:
-            raise ValueError("recvfrom not allowed on instances of %s" %
-                             self.__class__)
-        return socket.recvfrom(self, buflen, flags)
-
-    def recvfrom_into(self, buffer, nbytes=None, flags=0):
-        self._checkClosed()
-        if self._sslobj:
-            raise ValueError("recvfrom_into not allowed on instances of %s" %
-                             self.__class__)
-        else:
-            return socket.recvfrom_into(self, buffer, nbytes, flags)
-
-    def recvmsg(self, *args, **kwargs):
-        raise NotImplementedError("recvmsg not allowed on instances of %s" %
-                                  self.__class__)
-
-    def recvmsg_into(self, *args, **kwargs):
-        raise NotImplementedError("recvmsg_into not allowed on instances of "
-                                  "%s" % self.__class__)
-
-    def pending(self):
-        self._checkClosed()
-        if self._sslobj:
-            return self._sslobj.pending()
-        return 0
-
-    def shutdown(self, how):
-        self._checkClosed()
-        self._sslobj = None
-        socket.shutdown(self, how)
-
-    def close(self):
-        if self._makefile_refs < 1:
-            self._sslobj = None
-            socket.close(self)
-        else:
-            self._makefile_refs -= 1
-
-    if PYPY:
-
-        def _reuse(self):
-            self._makefile_refs += 1
-
-        def _drop(self):
-            if self._makefile_refs < 1:
-                self.close()
-            else:
-                self._makefile_refs -= 1
-
-    def _sslobj_shutdown(self):
-        while True:
-            try:
-                return self._sslobj.shutdown()
-            except SSLError as ex:
-                if ex.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
-                    return ''
-                if ex.args[0] == SSL_ERROR_WANT_READ:
-                    if self.timeout == 0.0:
-                        raise
-                    sys.exc_clear()
-                    self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
-                elif ex.args[0] == SSL_ERROR_WANT_WRITE:
-                    if self.timeout == 0.0:
-                        raise
-                    sys.exc_clear()
-                    self._wait(self._write_event, timeout_exc=_SSLErrorWriteTimeout)
-                else:
-                    raise
-
-    def unwrap(self):
-        if not self._sslobj:
-            raise ValueError("No SSL wrapper around " + str(self))
-
-        s = self._sslobj_shutdown()
-        self._sslobj = None
-        # match _ssl2; critical to drop/reuse here on PyPy
-        # XXX: _ssl3 returns an SSLSocket. Is that what the standard lib does on
-        # Python 2? Should we do that?
-        return socket(_sock=s)
-
-    def _real_close(self):
-        self._sslobj = None
-        socket._real_close(self) # pylint: disable=no-member
-
-    def do_handshake(self):
-        """Perform a TLS/SSL handshake."""
-        self._check_connected()
-        while True:
-            try:
-                self._sslobj.do_handshake()
-                break
-            except SSLWantReadError:
-                if self.timeout == 0.0:
-                    raise
-                self._wait(self._read_event, timeout_exc=_SSLErrorHandshakeTimeout)
-            except SSLWantWriteError:
-                if self.timeout == 0.0:
-                    raise
-                self._wait(self._write_event, timeout_exc=_SSLErrorHandshakeTimeout)
-
-        if self._context.check_hostname:
-            if not self.server_hostname:
-                raise ValueError("check_hostname needs server_hostname "
-                                 "argument")
-            match_hostname(self.getpeercert(), self.server_hostname)
-
-    def _real_connect(self, addr, connect_ex):
-        if self.server_side:
-            raise ValueError("can't connect in server-side mode")
-        # Here we assume that the socket is client-side, and not
-        # connected at the time of the call.  We connect it, then wrap it.
-        if self._connected:
-            raise ValueError("attempt to connect already-connected SSLSocket!")
-        self._sslobj = self._context._wrap_socket(self._sock, False, self.server_hostname, ssl_sock=self)
-        try:
-            if connect_ex:
-                rc = socket.connect_ex(self, addr)
-            else:
-                rc = None
-                socket.connect(self, addr)
-            if not rc:
-                self._connected = True
-                if self.do_handshake_on_connect:
-                    self.do_handshake()
-            return rc
-        except socket_error:
-            self._sslobj = None
-            raise
-
-    def connect(self, addr):
-        """Connects to remote ADDR, and then wraps the connection in
-        an SSL channel."""
-        self._real_connect(addr, False)
-
-    def connect_ex(self, addr):
-        """Connects to remote ADDR, and then wraps the connection in
-        an SSL channel."""
-        return self._real_connect(addr, True)
-
-    def accept(self):
-        """Accepts a new connection from a remote client, and returns
-        a tuple containing that new connection wrapped with a server-side
-        SSL channel, and the address of the remote client."""
-
-        newsock, addr = socket.accept(self)
-        newsock._drop_events()
-        newsock = self._context.wrap_socket(newsock,
-                                            do_handshake_on_connect=self.do_handshake_on_connect,
-                                            suppress_ragged_eofs=self.suppress_ragged_eofs,
-                                            server_side=True)
-        return newsock, addr
-
-    def makefile(self, mode='r', bufsize=-1):
-
-        """Make and return a file-like object that
-        works with the SSL connection.  Just use the code
-        from the socket module."""
-        if not PYPY:
-            self._makefile_refs += 1
-        # close=True so as to decrement the reference count when done with
-        # the file-like object.
-        return _fileobject(self, mode, bufsize, close=True)
-
-    def get_channel_binding(self, cb_type="tls-unique"):
-        """Get channel binding data for current connection.  Raise ValueError
-        if the requested `cb_type` is not supported.  Return bytes of the data
-        or None if the data is not available (e.g. before the handshake).
-        """
-        if cb_type not in CHANNEL_BINDING_TYPES:
-            raise ValueError("Unsupported channel binding type")
-        if cb_type != "tls-unique":
-            raise NotImplementedError(
-                "{0} channel binding type not implemented"
-                .format(cb_type))
-        if self._sslobj is None:
-            return None
-        return self._sslobj.tls_unique_cb()
-
-    def version(self):
-        """
-        Return a string identifying the protocol version used by the
-        current SSL channel, or None if there is no established channel.
-        """
-        if self._sslobj is None:
-            return None
-        return self._sslobj.version()
-
-if PYPY or not hasattr(SSLSocket, 'timeout'):
-    # PyPy (and certain versions of CPython) doesn't have a direct
-    # 'timeout' property on raw sockets, because that's not part of
-    # the documented specification. We may wind up wrapping a raw
-    # socket (when ssl is used with PyWSGI) or a gevent socket, which
-    # does have a read/write timeout property as an alias for
-    # get/settimeout, so make sure that's always the case because
-    # pywsgi can depend on that.
-    SSLSocket.timeout = property(lambda self: self.gettimeout(),
-                                 lambda self, value: self.settimeout(value))
-
-
-
-_SSLErrorReadTimeout = SSLError('The read operation timed out')
-_SSLErrorWriteTimeout = SSLError('The write operation timed out')
-_SSLErrorHandshakeTimeout = SSLError('The handshake operation timed out')
-
-def wrap_socket(sock, keyfile=None, certfile=None,
-                server_side=False, cert_reqs=CERT_NONE,
-                ssl_version=PROTOCOL_SSLv23, ca_certs=None,
-                do_handshake_on_connect=True,
-                suppress_ragged_eofs=True,
-                ciphers=None):
-
-    return SSLSocket(sock=sock, keyfile=keyfile, certfile=certfile,
-                     server_side=server_side, cert_reqs=cert_reqs,
-                     ssl_version=ssl_version, ca_certs=ca_certs,
-                     do_handshake_on_connect=do_handshake_on_connect,
-                     suppress_ragged_eofs=suppress_ragged_eofs,
-                     ciphers=ciphers)
-
-def get_server_certificate(addr, ssl_version=PROTOCOL_SSLv23, ca_certs=None):
-    """Retrieve the certificate from the server at the specified address,
-    and return it as a PEM-encoded string.
-    If 'ca_certs' is specified, validate the server cert against it.
-    If 'ssl_version' is specified, use it in the connection attempt."""
-
-    _, _ = addr
-    if ca_certs is not None:
-        cert_reqs = CERT_REQUIRED
-    else:
-        cert_reqs = CERT_NONE
-    context = _create_stdlib_context(ssl_version,
-                                     cert_reqs=cert_reqs,
-                                     cafile=ca_certs)
-    with closing(create_connection(addr)) as sock:
-        with closing(context.wrap_socket(sock)) as sslsock:
-            dercert = sslsock.getpeercert(True)
-    return DER_cert_to_PEM_cert(dercert)