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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 XML Signature handler to support SOAP headers."""
__author__ = 'api.sgrinberg@gmail.com (Stan Grinberg)'
from aw_api import Utils
class SigHandler(object):
"""Implements SigHandler.
Rosponsible for creating XML Signature handler to support SOAP headers
for the outgoing SOAP message. Overwrites XML Signature handler, must sign
and verify.
"""
def __init__(self, headers, config):
"""Inits SigHandler with authentication headers.
Args:
headers: dict dictionary object with populated authentication
credentials.
config: dict dictionary object with populated configuration values.
"""
self.__headers = headers
self.__config = config
def sign(self, soap_writer):
"""Sign signature handler.
Args:
soap_writer: SoapWriter instance.
"""
keys = []
for key in self.__headers:
keys.append((key, self.__headers[key]))
keys = tuple(keys)
header = soap_writer._header
body = soap_writer.body
# Set RequestHeader element, if appropriate.
if 'ns_target' in self.__config:
name_space, target = self.__config['ns_target']
header = header.createAppendElement('', target)
header.setNamespaceAttribute('', name_space)
# Explicitly set namespace at the request method's level. For services
# with multiple namespaces, this has to be done prior to checking where
# RequestHeader elements point.
if body._getElements():
body._getElements()[0].setAttributeNS('', 'xmlns:ns1', name_space)
# Make sure that the namespace for RequestHeader elements is pointing
# at cm/.
if 'cm' not in Utils.GetPathFromUrl(name_space).split('/'):
parts = name_space.split('/')
parts[-2] = 'cm'
name_space = '/'.join(parts)
else:
name_space = ''
for key, value in keys:
if value is None:
value = ''
header.createAppendElement(name_space, key).createAppendTextNode(value)
def verify(self, soap_writer):
"""Veirfy if signature handler is signed.
Args:
soap_writer: SoapWriter instance.
Raises:
VerifyError to indicate invalid signature.
"""
pass
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