Remove windows python distribution from repo and add requirements.txt

1 files changed, 0 insertions, 712 deletions

diff --git a/python/gevent/_ssl3.py b/python/gevent/_ssl3.py
deleted file mode 100644
index 71e2f76..0000000
--- a/python/gevent/_ssl3.py
+++ /dev/null
@@ -1,712 +0,0 @@
-# Wrapper module for _ssl. Written by Bill Janssen.
-# Ported to gevent by Denis Bilenko.
-"""SSL wrapper for socket objects on Python 3.
-
-For the documentation, refer to :mod:`ssl` module manual.
-
-This module implements cooperative SSL socket wrappers.
-"""
-# Our import magic sadly makes this warning useless
-# pylint: disable=undefined-variable
-# pylint:disable=no-member
-
-from __future__ import absolute_import
-import ssl as __ssl__
-
-_ssl = __ssl__._ssl
-
-import errno
-from gevent.socket import socket, timeout_default
-from gevent.socket import error as socket_error
-from gevent.socket import timeout as _socket_timeout
-from gevent._util import copy_globals
-
-from weakref import ref as _wref
-
-__implements__ = [
-    'SSLContext',
-    'SSLSocket',
-    'wrap_socket',
-    'get_server_certificate',
-]
-
-# 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
-                           names_to_ignore=__implements__ + ['socket'],
-                           dunder_names_to_keep=())
-
-__all__ = __implements__ + __imports__
-if 'namedtuple' in __all__:
-    __all__.remove('namedtuple')
-
-orig_SSLContext = __ssl__.SSLContext # pylint:disable=no-member
-
-
-class SSLContext(orig_SSLContext):
-
-    # Added in Python 3.7
-    sslsocket_class = None # SSLSocket is assigned later
-
-    def wrap_socket(self, sock, server_side=False,
-                    do_handshake_on_connect=True,
-                    suppress_ragged_eofs=True,
-                    server_hostname=None,
-                    session=None):
-        # pylint:disable=arguments-differ,not-callable
-        # (3.6 adds session)
-        # Sadly, using *args and **kwargs doesn't work
-        return self.sslsocket_class(
-            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,
-            _session=session)
-
-    if not hasattr(orig_SSLContext, 'check_hostname'):
-        # Python 3.3 lacks this
-        check_hostname = False
-
-    if hasattr(orig_SSLContext.options, 'setter'):
-        # In 3.6, these became properties. They want to access the
-        # property __set__ method in the superclass, and they do so by using
-        # super(SSLContext, SSLContext). But we rebind SSLContext when we monkey
-        # patch, which causes infinite recursion.
-        # https://github.com/python/cpython/commit/328067c468f82e4ec1b5c510a4e84509e010f296
-        # pylint:disable=no-member
-        @orig_SSLContext.options.setter
-        def options(self, value):
-            super(orig_SSLContext, orig_SSLContext).options.__set__(self, value)
-
-        @orig_SSLContext.verify_flags.setter
-        def verify_flags(self, value):
-            super(orig_SSLContext, orig_SSLContext).verify_flags.__set__(self, value)
-
-        @orig_SSLContext.verify_mode.setter
-        def verify_mode(self, value):
-            super(orig_SSLContext, orig_SSLContext).verify_mode.__set__(self, value)
-
-    if hasattr(orig_SSLContext, 'minimum_version'):
-        # Like the above, added in 3.7
-        @orig_SSLContext.minimum_version.setter
-        def minimum_version(self, value):
-            super(orig_SSLContext, orig_SSLContext).minimum_version.__set__(self, value)
-
-        @orig_SSLContext.maximum_version.setter
-        def maximum_version(self, value):
-            super(orig_SSLContext, orig_SSLContext).maximum_version.__set__(self, value)
-
-
-class _contextawaresock(socket._gevent_sock_class): # Python 2: pylint:disable=slots-on-old-class
-    # We have to pass the raw stdlib socket to SSLContext.wrap_socket.
-    # That method in turn can pass that object on to things like SNI callbacks.
-    # It wouldn't have access to any of the attributes on the SSLSocket, like
-    # context, that it's supposed to (see test_ssl.test_sni_callback). Our
-    # solution is to keep a weak reference to the SSLSocket on the raw
-    # socket and delegate.
-
-    # We keep it in a slot to avoid having the ability to set any attributes
-    # we're not prepared for (because we don't know what to delegate.)
-
-    __slots__ = ('_sslsock',)
-
-    @property
-    def context(self):
-        return self._sslsock().context
-
-    @context.setter
-    def context(self, ctx):
-        self._sslsock().context = ctx
-
-    @property
-    def session(self):
-        """The SSLSession for client socket."""
-        return self._sslsock().session
-
-    @session.setter
-    def session(self, session):
-        self._sslsock().session = session
-
-    def __getattr__(self, name):
-        try:
-            return getattr(self._sslsock(), name)
-        except RuntimeError:
-            # XXX: If the attribute doesn't exist,
-            # we infinitely recurse
-            pass
-        raise AttributeError(name)
-
-try:
-    _SSLObject_factory = SSLObject
-except NameError:
-    # 3.4 and below do not have SSLObject, something
-    # we magically import through copy_globals
-    pass
-else:
-    if hasattr(SSLObject, '_create'):
-        # 3.7 is making thing difficult and won't let you
-        # actually construct an object
-        def _SSLObject_factory(sslobj, owner=None, session=None):
-            s = SSLObject.__new__(SSLObject)
-            s._sslobj = sslobj
-            s._sslobj.owner = owner or s
-            if session is not None:
-                s._sslobj.session = session
-            return s
-
-class SSLSocket(socket):
-    """
-    gevent `ssl.SSLSocket <https://docs.python.org/3/library/ssl.html#ssl-sockets>`_
-    for Python 3.
-    """
-
-    # pylint:disable=too-many-instance-attributes,too-many-public-methods
-
-    _gevent_sock_class = _contextawaresock
-
-    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,
-                 _session=None, # 3.6
-                 _context=None):
-
-        # pylint:disable=too-many-locals,too-many-statements,too-many-branches
-        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 server_side:
-            if server_hostname:
-                raise ValueError("server_hostname can only be specified "
-                                 "in client mode")
-            if _session is not None:
-                raise ValueError("session can only be specified "
-                                 "in client mode")
-        if self._context.check_hostname and not server_hostname:
-            raise ValueError("check_hostname requires server_hostname")
-        self._session = _session
-        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
-        connected = False
-        if sock is not None:
-            socket.__init__(self,
-                            family=sock.family,
-                            type=sock.type,
-                            proto=sock.proto,
-                            fileno=sock.fileno())
-            self.settimeout(sock.gettimeout())
-            # see if it's connected
-            try:
-                sock.getpeername()
-            except socket_error as e:
-                if e.errno != errno.ENOTCONN:
-                    raise
-            else:
-                connected = True
-            sock.detach()
-        elif fileno is not None:
-            socket.__init__(self, fileno=fileno)
-        else:
-            socket.__init__(self, family=family, type=type, proto=proto)
-
-        self._sock._sslsock = _wref(self)
-        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)
-                if _session is not None: # 3.6+
-                    self._sslobj = _SSLObject_factory(self._sslobj, owner=self,
-                                                      session=self._session)
-                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
-
-    @property
-    def session(self):
-        """The SSLSession for client socket."""
-        if self._sslobj is not None:
-            return self._sslobj.session
-
-    @session.setter
-    def session(self, session):
-        self._session = session
-        if self._sslobj is not None:
-            self._sslobj.session = session
-
-    @property
-    def session_reused(self):
-        """Was the client session reused during handshake"""
-        if self._sslobj is not None:
-            return self._sslobj.session_reused
-
-    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."""
-        # pylint:disable=too-many-branches
-        self._checkClosed()
-
-        while True:
-            if not self._sslobj:
-                raise ValueError("Read on closed or unwrapped SSL socket.")
-            if len == 0:
-                return b'' if buffer is None else 0
-            # Negative lengths are handled natively when the buffer is None
-            # to raise a ValueError
-            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 None:
-                        return b''
-                    return 0
-                raise
-
-    def write(self, data):
-        """Write DATA to the underlying SSL channel.  Returns
-        number of bytes of DATA actually transmitted."""
-        self._checkClosed()
-
-        while True:
-            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()
-        try:
-            c = self._sslobj.peer_certificate
-        except AttributeError:
-            # 3.6
-            c = self._sslobj.getpeercert
-
-        return c(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'):
-        # 3.5+
-        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 shared_ciphers(self):
-            """Return a list of ciphers shared by the client during the handshake or
-            None if this is not a valid server connection.
-            """
-            return self._sslobj.shared_ciphers()
-
-        def version(self):
-            """Return a string identifying the protocol version used by the
-            current SSL channel. """
-            if not self._sslobj:
-                return None
-            return self._sslobj.version()
-
-        # We inherit sendfile from super(); it always uses `send`
-
-    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 send(self, data, flags=0, timeout=timeout_default):
-        self._checkClosed()
-        if timeout is timeout_default:
-            timeout = self.timeout
-        if self._sslobj:
-            if flags != 0:
-                raise ValueError(
-                    "non-zero flags not allowed in calls to send() on %s" %
-                    self.__class__)
-            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)
-        else:
-            return socket.send(self, data, flags, timeout)
-
-    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()
-        if self._sslobj:
-            if flags != 0:
-                raise ValueError(
-                    "non-zero flags not allowed in calls to sendall() on %s" %
-                    self.__class__)
-
-        try:
-            return socket.sendall(self, data, flags)
-        except _socket_timeout:
-            if self.timeout == 0.0:
-                # Raised by the stdlib on non-blocking sockets
-                raise SSLWantWriteError("The operation did not complete (write)")
-            raise
-
-    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:
-                # https://github.com/python/cpython/commit/00915577dd84ba75016400793bf547666e6b29b5
-                # Python #23804
-                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 and (nbytes is None):
-            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__)
-        else:
-            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 unwrap(self):
-        if not self._sslobj:
-            raise ValueError("No SSL wrapper around " + str(self))
-
-        while True:
-            try:
-                s = self._sslobj.shutdown()
-                break
-            except SSLWantReadError:
-                # Callers of this method expect to get a socket
-                # back, so we can't simply return 0, we have
-                # to let these be raised
-                if self.timeout == 0.0:
-                    raise
-                self._wait(self._read_event)
-            except SSLWantWriteError:
-                if self.timeout == 0.0:
-                    raise
-                self._wait(self._write_event)
-
-        self._sslobj = None
-
-        # The return value of shutting down the SSLObject is the
-        # original wrapped socket passed to _wrap_socket, i.e.,
-        # _contextawaresock. But that object doesn't have the
-        # gevent wrapper around it so it can't be used. We have to
-        # wrap it back up with a gevent wrapper.
-        assert s is self._sock
-        # In the stdlib, SSLSocket subclasses socket.socket and passes itself
-        # to _wrap_socket, so it gets itself back. We can't do that, we have to
-        # pass our subclass of _socket.socket, _contextawaresock.
-        # So ultimately we should return ourself.
-
-        # See test_ftplib.py:TestTLS_FTPClass.test_ccc
-        return self
-
-    def _real_close(self):
-        self._sslobj = None
-        # self._closed = True
-        socket._real_close(self)
-
-    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 sys.version_info[:2] < (3, 7) and self._context.check_hostname:
-            # In Python 3.7, the underlying OpenSSL name matching is used.
-            # The version implemented in Python doesn't understand IDNA encoding.
-            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)
-        if self._session is not None: # 3.6+
-            self._sslobj = _SSLObject_factory(self._sslobj, owner=self, session=self._session)
-        try:
-            if connect_ex:
-                rc = socket.connect_ex(self, addr)
-            else:
-                rc = None
-                socket.connect(self, addr)
-            if not rc:
-                if self.do_handshake_on_connect:
-                    self.do_handshake()
-                self._connected = True
-            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 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 hasattr(self._sslobj, 'get_channel_binding'):
-            # 3.7+, and sslobj is not None
-            return self._sslobj.get_channel_binding(cb_type)
-        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()
-
-
-# Python does not support forward declaration of types
-SSLContext.sslsocket_class = SSLSocket
-
-# Python 3.2 onwards raise normal timeout errors, not SSLError.
-# See https://bugs.python.org/issue10272
-_SSLErrorReadTimeout = _socket_timeout('The read operation timed out')
-_SSLErrorWriteTimeout = _socket_timeout('The write operation timed out')
-_SSLErrorHandshakeTimeout = _socket_timeout('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
-    s = create_connection(addr)
-    s = wrap_socket(s, ssl_version=ssl_version,
-                    cert_reqs=cert_reqs, ca_certs=ca_certs)
-    dercert = s.getpeercert(True)
-    s.close()
-    return DER_cert_to_PEM_cert(dercert)