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: connection.py

from __future__ import absolute_import
import re
import datetime
import logging
import os
import socket
from socket import error as SocketError, timeout as SocketTimeout
import warnings
from .packages import six
from .packages.six.moves.http_client import HTTPConnection as _HTTPConnection
from .packages.six.moves.http_client import HTTPException  # noqa: F401

try:  # Compiled with SSL?
    import ssl
    BaseSSLError = ssl.SSLError
except (ImportError, AttributeError):  # Platform-specific: No SSL.
    ssl = None

class BaseSSLError(BaseException):
        pass

try:  # Python 3:
    # Not a no-op, we're adding this to the namespace so it can be imported.
    ConnectionError = ConnectionError
except NameError:  # Python 2:
    class ConnectionError(Exception):
        pass

from .exceptions import (
    NewConnectionError,
    ConnectTimeoutError,
    SubjectAltNameWarning,
    SystemTimeWarning,
)
from .packages.ssl_match_hostname import match_hostname, CertificateError

from .util.ssl_ import (
    resolve_cert_reqs,
    resolve_ssl_version,
    assert_fingerprint,
    create_urllib3_context,
    ssl_wrap_socket
)

from .util import connection

from ._collections import HTTPHeaderDict

log = logging.getLogger(__name__)

port_by_scheme = {
    'http': 80,
    'https': 443,
}

# When updating RECENT_DATE, move it to within two years of the current date,
# and not less than 6 months ago.
# Example: if Today is 2018-01-01, then RECENT_DATE should be any date on or
# after 2016-01-01 (today - 2 years) AND before 2017-07-01 (today - 6 months)
RECENT_DATE = datetime.date(2025,  6, 28)

_CONTAINS_CONTROL_CHAR_RE = re.compile(r"[^-!#$%&'*+.^_`|~0-9a-zA-Z]")

class DummyConnection(object):
    """Used to detect a failed ConnectionCls import."""
    pass

class HTTPConnection(_HTTPConnection, object):
    """
    Based on httplib.HTTPConnection but provides an extra constructor
    backwards-compatibility layer between older and newer Pythons.

Additional keyword parameters are used to configure attributes of the connection.
    Accepted parameters include:

- ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool`
      - ``source_address``: Set the source address for the current connection.
      - ``socket_options``: Set specific options on the underlying socket. If not specified, then
        defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
        Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.

For example, if you wish to enable TCP Keep Alive in addition to the defaults,
        you might pass::

HTTPConnection.default_socket_options + [
                (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
            ]

Or you may want to disable the defaults by passing an empty list (e.g., ``[]``).
    """

default_port = port_by_scheme['http']

#: Disable Nagle's algorithm by default.
    #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
    default_socket_options = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]

#: Whether this connection verifies the host's certificate.
    is_verified = False

def __init__(self, *args, **kw):
        if six.PY3:  # Python 3
            kw.pop('strict', None)

# Pre-set source_address.
        self.source_address = kw.get('source_address')

#: The socket options provided by the user. If no options are
        #: provided, we use the default options.
        self.socket_options = kw.pop('socket_options', self.default_socket_options)

_HTTPConnection.__init__(self, *args, **kw)

@property
    def host(self):
        """
        Getter method to remove any trailing dots that indicate the hostname is an FQDN.

In general, SSL certificates don't include the trailing dot indicating a
        fully-qualified domain name, and thus, they don't validate properly when
        checked against a domain name that includes the dot. In addition, some
        servers may not expect to receive the trailing dot when provided.

However, the hostname with trailing dot is critical to DNS resolution; doing a
        lookup with the trailing dot will properly only resolve the appropriate FQDN,
        whereas a lookup without a trailing dot will search the system's search domain
        list. Thus, it's important to keep the original host around for use only in
        those cases where it's appropriate (i.e., when doing DNS lookup to establish the
        actual TCP connection across which we're going to send HTTP requests).
        """
        return self._dns_host.rstrip('.')

@host.setter
    def host(self, value):
        """
        Setter for the `host` property.

We assume that only urllib3 uses the _dns_host attribute; httplib itself
        only uses `host`, and it seems reasonable that other libraries follow suit.
        """
        self._dns_host = value

def _new_conn(self):
        """ Establish a socket connection and set nodelay settings on it.

:return: New socket connection.
        """
        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 = connection.create_connection(
                (self._dns_host, self.port), self.timeout, **extra_kw)

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

except SocketError as e:
            raise NewConnectionError(
                self, "Failed to establish a new connection: %s" % e)

return conn

def _prepare_conn(self, conn):
        self.sock = conn
        if self._tunnel_host:
            # TODO: Fix tunnel so it doesn't depend on self.sock state.
            self._tunnel()
            # Mark this connection as not reusable
            self.auto_open = 0

def connect(self):
        conn = self._new_conn()
        self._prepare_conn(conn)

def putrequest(self, method, url, *args, **kwargs):
        """Send a request to the server"""
        match = _CONTAINS_CONTROL_CHAR_RE.search(method)
        if match:
            raise ValueError(
                "Method cannot contain non-token characters %r (found at least %r)"
                % (method, match.group())
            )

return _HTTPConnection.putrequest(self, method, url, *args, **kwargs)

def request_chunked(self, method, url, body=None, headers=None):
        """
        Alternative to the common request method, which sends the
        body with chunked encoding and not as one block
        """
        headers = HTTPHeaderDict(headers if headers is not None else {})
        skip_accept_encoding = 'accept-encoding' in headers
        skip_host = 'host' in headers
        self.putrequest(
            method,
            url,
            skip_accept_encoding=skip_accept_encoding,
            skip_host=skip_host
        )
        for header, value in headers.items():
            self.putheader(header, value)
        if 'transfer-encoding' not in headers:
            self.putheader('Transfer-Encoding', 'chunked')
        self.endheaders()

if body is not None:
            stringish_types = six.string_types + (bytes,)
            if isinstance(body, stringish_types):
                body = (body,)
            for chunk in body:
                if not chunk:
                    continue
                if not isinstance(chunk, bytes):
                    chunk = chunk.encode('utf8')
                len_str = hex(len(chunk))[2:]
                self.send(len_str.encode('utf-8'))
                self.send(b'\r\n')
                self.send(chunk)
                self.send(b'\r\n')

# After the if clause, to always have a closed body
        self.send(b'0\r\n\r\n')

class HTTPSConnection(HTTPConnection):
    default_port = port_by_scheme['https']

ssl_version = None

def __init__(self, host, port=None, key_file=None, cert_file=None,
                 strict=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
                 ssl_context=None, server_hostname=None, **kw):

HTTPConnection.__init__(self, host, port, strict=strict,
                                timeout=timeout, **kw)

self.key_file = key_file
        self.cert_file = cert_file
        self.ssl_context = ssl_context
        self.server_hostname = server_hostname

# Required property for Google AppEngine 1.9.0 which otherwise causes
        # HTTPS requests to go out as HTTP. (See Issue #356)
        self._protocol = 'https'

def connect(self):
        conn = self._new_conn()
        self._prepare_conn(conn)

if self.ssl_context is None:
            self.ssl_context = create_urllib3_context(
                ssl_version=resolve_ssl_version(None),
                cert_reqs=resolve_cert_reqs(None),
            )

self.sock = ssl_wrap_socket(
            sock=conn,
            keyfile=self.key_file,
            certfile=self.cert_file,
            ssl_context=self.ssl_context,
            server_hostname=self.server_hostname
        )

class VerifiedHTTPSConnection(HTTPSConnection):
    """
    Based on httplib.HTTPSConnection but wraps the socket with
    SSL certification.
    """
    cert_reqs = None
    ca_certs = None
    ca_cert_dir = None
    ssl_version = None
    assert_fingerprint = None

def set_cert(self, key_file=None, cert_file=None,
                 cert_reqs=None, ca_certs=None,
                 assert_hostname=None, assert_fingerprint=None,
                 ca_cert_dir=None):
        """
        This method should only be called once, before the connection is used.
        """
        # If cert_reqs is not provided, we can try to guess. If the user gave
        # us a cert database, we assume they want to use it: otherwise, if
        # they gave us an SSL Context object we should use whatever is set for
        # it.
        if cert_reqs is None:
            if ca_certs or ca_cert_dir:
                cert_reqs = 'CERT_REQUIRED'
            elif self.ssl_context is not None:
                cert_reqs = self.ssl_context.verify_mode

self.key_file = key_file
        self.cert_file = cert_file
        self.cert_reqs = cert_reqs
        self.assert_hostname = assert_hostname
        self.assert_fingerprint = assert_fingerprint
        self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
        self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)

def connect(self):
        # Add certificate verification
        conn = self._new_conn()
        hostname = self.host

if self._tunnel_host:
            self.sock = conn
            # Calls self._set_hostport(), so self.host is
            # self._tunnel_host below.
            self._tunnel()
            # Mark this connection as not reusable
            self.auto_open = 0

# Override the host with the one we're requesting data from.
            hostname = self._tunnel_host

server_hostname = hostname
        if self.server_hostname is not None:
            server_hostname = self.server_hostname

is_time_off = datetime.date.today() < RECENT_DATE
        if is_time_off:
            warnings.warn((
                'System time is way off (before {0}). This will probably '
                'lead to SSL verification errors').format(RECENT_DATE),
                SystemTimeWarning
            )

# Wrap socket using verification with the root certs in
        # trusted_root_certs
        if self.ssl_context is None:
            self.ssl_context = create_urllib3_context(
                ssl_version=resolve_ssl_version(self.ssl_version),
                cert_reqs=resolve_cert_reqs(self.cert_reqs),
            )

context = self.ssl_context
        context.verify_mode = resolve_cert_reqs(self.cert_reqs)
        self.sock = ssl_wrap_socket(
            sock=conn,
            keyfile=self.key_file,
            certfile=self.cert_file,
            ca_certs=self.ca_certs,
            ca_cert_dir=self.ca_cert_dir,
            server_hostname=server_hostname,
            ssl_context=context)

if self.assert_fingerprint:
            assert_fingerprint(self.sock.getpeercert(binary_form=True),
                               self.assert_fingerprint)
        elif context.verify_mode != ssl.CERT_NONE \
                and not getattr(context, 'check_hostname', False) \
                and self.assert_hostname is not False:
            # While urllib3 attempts to always turn off hostname matching from
            # the TLS library, this cannot always be done. So we check whether
            # the TLS Library still thinks it's matching hostnames.
            cert = self.sock.getpeercert()
            if not cert.get('subjectAltName', ()):
                warnings.warn((
                    'Certificate for {0} has no `subjectAltName`, falling back to check for a '
                    '`commonName` for now. This feature is being removed by major browsers and '
                    'deprecated by RFC 2818. (See https://github.com/shazow/urllib3/issues/497 '
                    'for details.)'.format(hostname)),
                    SubjectAltNameWarning
                )
            _match_hostname(cert, self.assert_hostname or server_hostname)

self.is_verified = (
            context.verify_mode == ssl.CERT_REQUIRED or
            self.assert_fingerprint is not None
        )

def _match_hostname(cert, asserted_hostname):
    try:
        match_hostname(cert, asserted_hostname)
    except CertificateError as e:
        log.error(
            'Certificate did not match expected hostname: %s. '
            'Certificate: %s', asserted_hostname, cert
        )
        # Add cert to exception and reraise so client code can inspect
        # the cert when catching the exception, if they want to
        e._peer_cert = cert
        raise

if ssl:
    # Make a copy for testing.
    UnverifiedHTTPSConnection = HTTPSConnection
    HTTPSConnection = VerifiedHTTPSConnection
else:
    HTTPSConnection = DummyConnection

Name	Type	Last Edit	Size	Owner/Group	Permission	Action
..
__init__.py	file	2019-04-17 17:46	2.66 KB	root/root	s---------
_collections.py	file	2026-01-28 10:03	11.04 KB	root/root	s---------
connection.py	file	2026-01-28 10:03	14.01 KB	root/root	s---------
connectionpool.py	file	2026-01-28 10:03	34.77 KB	root/root	s---------
exceptions.py	file	2019-04-17 17:46	6.45 KB	root/root	s---------
fields.py	file	2019-04-17 17:46	5.8 KB	root/root	s---------
filepost.py	file	2019-04-17 17:46	2.38 KB	root/root	s---------
poolmanager.py	file	2026-01-28 10:03	16.82 KB	root/root	s---------
request.py	file	2019-04-17 17:46	5.85 KB	root/root	s---------
response.py	file	2026-01-28 10:03	33.64 KB	root/root	s---------