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#!/usr/bin/python
#
# Copyright 2009 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Creates custom HTTPConnection to support HTTP proxy."""
__author__ = 'api.sgrinberg@gmail.com (Stan Grinberg)'
import httplib
from aw_api import Utils
class HttpConnectionHandler(httplib.HTTPConnection):
"""Implements HttpConnectionHandler.
Responsible for creating custom HTTP connection object to support HTTP proxy
connection. Overwrites HTTPConnection, must putrequest.
"""
http_proxy = ''
def __init__(self, host, port=None, strict=None, timeout=None):
"""Inits HttpConnectionHandler with host and port.
Args:
host: str proxy's HTTP host or combined form of host:port.
[optional]
port: int proxy's HTTP port number.
strict: bool if True, causes BadStatusLine to be raised if the status
line can't be parsed as a valid HTTP/1.0 or 1.1 status line. This
argument is ignored.
timeout: int blocking operations will timeout after that many seconds.
This argument is ignored.
"""
self.__host = host
self.__port = port
self.__http_proxy = HttpConnectionHandler.http_proxy or host
httplib.HTTPConnection.__init__(self, host=self.__http_proxy,
port=self.__port)
def putrequest(self, method, url, skip_host=False,
skip_accept_encoding=False):
"""Send a line to the server consisting of the request string, the selector
string, and the HTTP version.
Args:
method: str HTTP request method.
url: str selector URL.
[optional]
skip_host: bool if True, disable automatic sending of Host header.
skip_accept_encoding: bool if True, disable automatic sending of
Accept-Encoding header.
"""
if self.__http_proxy != self.__host:
scheme = Utils.GetSchemeFromUrl(url) or 'http'
netloc = Utils.GetNetLocFromUrl(url) or self.__host
path = Utils.GetPathFromUrl(url)
uri = '%s://%s%s' % (scheme, netloc, path)
else:
uri = url
httplib.HTTPConnection.putrequest(self, method=method, url=uri,
skip_host=skip_host,
skip_accept_encoding=skip_accept_encoding)
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