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"""M2Crypto support for Python's httplib.
Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved."""
import string, sys
import socket
from urlparse import urlsplit, urlunsplit
import base64
from httplib import *
from httplib import HTTPS_PORT # This is not imported with just '*'
import SSL
class HTTPSConnection(HTTPConnection):
"""
This class allows communication via SSL using M2Crypto.
"""
default_port = HTTPS_PORT
def __init__(self, host, port=None, strict=None, **ssl):
self.session = None
keys = ssl.keys()
try:
keys.remove('key_file')
except ValueError:
pass
try:
keys.remove('cert_file')
except ValueError:
pass
try:
keys.remove('ssl_context')
except ValueError:
pass
if keys:
raise ValueError('unknown keyword argument')
try:
self.ssl_ctx = ssl['ssl_context']
assert isinstance(self.ssl_ctx, SSL.Context), self.ssl_ctx
except KeyError:
self.ssl_ctx = SSL.Context('sslv23')
HTTPConnection.__init__(self, host, port, strict)
def connect(self):
self.sock = SSL.Connection(self.ssl_ctx)
if self.session:
self.sock.set_session(self.session)
self.sock.connect((self.host, self.port))
def close(self):
# This kludges around line 545 of httplib.py,
# which closes the connection in this object;
# the connection remains open in the response
# object.
#
# M2Crypto doesn't close-here-keep-open-there,
# so, in effect, we don't close until the whole
# business is over and gc kicks in.
#
# XXX Long-running callers beware leakage.
#
# XXX 05-Jan-2002: This module works with Python 2.2,
# XXX but I've not investigated if the above conditions
# XXX remain.
pass
def get_session(self):
return self.sock.get_session()
def set_session(self, session):
self.session = session
class HTTPS(HTTP):
_connection_class = HTTPSConnection
def __init__(self, host='', port=None, strict=None, **ssl):
HTTP.__init__(self, host, port, strict)
try:
self.ssl_ctx = ssl['ssl_context']
except KeyError:
self.ssl_ctx = SSL.Context('sslv23')
assert isinstance(self._conn, HTTPSConnection)
self._conn.ssl_ctx = self.ssl_ctx
class ProxyHTTPSConnection(HTTPSConnection):
"""
An HTTPS Connection that uses a proxy and the CONNECT request.
When the connection is initiated, CONNECT is first sent to the proxy (along
with authorization headers, if supplied). If successful, an SSL connection
will be established over the socket through the proxy and to the target
host.
Finally, the actual request is sent over the SSL connection tunneling
through the proxy.
"""
_ports = {'http' : 80, 'https' : 443}
_AUTH_HEADER = "Proxy-Authorization"
_UA_HEADER = "User-Agent"
def __init__(self, host, port=None, strict=None, username=None,
password=None, **ssl):
"""
Create the ProxyHTTPSConnection object.
host and port are the hostname and port number of the proxy server.
"""
HTTPSConnection.__init__(self, host, port, strict, **ssl)
self._username = username
self._password = password
self._proxy_auth = None
self._proxy_UA = None
def putrequest(self, method, url, skip_host=0, skip_accept_encoding=0):
#putrequest is called before connect, so can interpret url and get
#real host/port to be used to make CONNECT request to proxy
proto, netloc, path, query, fragment = urlsplit(url)
if not proto:
raise ValueError, "unknown URL type: %s" % url
#get host & port
try:
username_password, host_port = netloc.split('@')
except ValueError:
host_port = netloc
try:
host, port = host_port.split(':')
except ValueError:
host = host_port
#try to get port from proto
try:
port = self._ports[proto]
except KeyError:
raise ValueError, "unknown protocol for: %s" % url
self._real_host = host
self._real_port = int(port)
rest = urlunsplit((None, None, path, query, fragment))
if sys.version_info < (2,4):
HTTPSConnection.putrequest(self, method, rest, skip_host)
else:
HTTPSConnection.putrequest(self, method, rest, skip_host, skip_accept_encoding)
def putheader(self, header, value):
# Store the auth header if passed in.
if header.lower() == self._UA_HEADER.lower():
self._proxy_UA = value
if header.lower() == self._AUTH_HEADER.lower():
self._proxy_auth = value
else:
HTTPSConnection.putheader(self, header, value)
def endheaders(self):
# We've recieved all of hte headers. Use the supplied username
# and password for authorization, possibly overriding the authstring
# supplied in the headers.
if not self._proxy_auth:
self._proxy_auth = self._encode_auth()
HTTPSConnection.endheaders(self)
def connect(self):
HTTPConnection.connect(self)
#send proxy CONNECT request
self.sock.sendall(self._get_connect_msg())
response = HTTPResponse(self.sock)
response.begin()
code = response.status
if code != 200:
#proxy returned and error, abort connection, and raise exception
self.close()
raise socket.error, "Proxy connection failed: %d" % code
self._start_ssl()
def _get_connect_msg(self):
""" Return an HTTP CONNECT request to send to the proxy. """
msg = "CONNECT %s:%d HTTP/1.1\r\n" % (self._real_host, self._real_port)
msg = msg + "Host: %s:%d\r\n" % (self._real_host, self._real_port)
if self._proxy_UA:
msg = msg + "%s: %s\r\n" % (self._UA_HEADER, self._proxy_UA)
if self._proxy_auth:
msg = msg + "%s: %s\r\n" % (self._AUTH_HEADER, self._proxy_auth)
msg = msg + "\r\n"
return msg
def _start_ssl(self):
""" Make this connection's socket SSL-aware. """
self.sock = SSL.Connection(self.ssl_ctx, self.sock)
self.sock.setup_ssl()
self.sock.set_connect_state()
self.sock.connect_ssl()
def _encode_auth(self):
""" Encode the username and password for use in the auth header. """
if not (self._username and self._password):
return None
# Authenticated proxy
userpass = "%s:%s" % (self._username, self._password)
enc_userpass = base64.encodestring(userpass).replace("\n", "")
return "Basic %s" % enc_userpass
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