Source Code for Package ndg.saml

 1  """Implementation of SAML 2.0 for NDG Security 
 2   
 3  NERC DataGrid Project 
 4   
 5  This implementation is adapted from the Java OpenSAML implementation.  The  
 6  copyright and licence information are included here: 
 7   
 8  Copyright [2005] [University Corporation for Advanced Internet Development, Inc.] 
 9   
10  Licensed under the Apache License, Version 2.0 (the "License"); 
11  you may not use this file except in compliance with the License. 
12  You may obtain a copy of the License at 
13   
14  http://www.apache.org/licenses/LICENSE-2.0 
15   
16  Unless required by applicable law or agreed to in writing, software 
17  distributed under the License is distributed on an "AS IS" BASIS, 
18  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
19  See the License for the specific language governing permissions and 
20  limitations under the License. 
21  """ 
22  __author__ = "P J Kershaw" 
23  __date__ = "22/07/08" 
24  __copyright__ = "(C) 2009 Science and Technology Facilities Council" 
25  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
26  __license__ = "http://www.apache.org/licenses/LICENSE-2.0" 
27  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
28  __revision__ = "$Id: __init__.py 8009 2012-01-30 16:19:43Z rwilkinson $" 
29   
30 -class Config(object): 
31      """Configuration options 
32      @type use_lxml: bool 
33      @cvar use_lxml: Controls whether lxml.etree should be imported instead of 
34      etree. lxml is required for XPath expressions with conditions. 
35      """ 
36      use_lxml = None 
37   
38 -def importElementTreeAndCElementTree(): 
39      """Imports ElementTree and cElementTree, or the lxml ElementTree API, 
40      depending on the Config.use_lxml value and whether the lxml package is 
41      found. 
42      @rtype: tuple (module, module) 
43      @return: the ElementTree and cElementTree modules that have been imported - 
44      None is returned instead of cElementTree if lxml is used. 
45      """ 
46      cElementTree = None 
47      if Config.use_lxml is not None: 
48          if Config.use_lxml: 
49              from lxml import etree as ElementTree 
50          else: 
51              try: # python 2.5 
52                  # Force absolute import to prevent clash with 
53                  # ndg.saml.xml.etree. 
54                  p = __import__('xml.etree', globals(), locals(), 
55                                 ['cElementTree', 'ElementTree'], 0) 
56                  cElementTree = p.cElementTree 
57                  ElementTree = p.ElementTree 
58              except ImportError: 
59                  # if you've installed it yourself it comes this way 
60                  import cElementTree, ElementTree 
61      else: 
62          Config.use_lxml = False 
63          try: 
64              from lxml import etree as ElementTree 
65              Config.use_lxml = True 
66          except ImportError: 
67              try: # python 2.5 
68                  p = __import__('xml.etree', globals(), locals(), 
69                                 ['cElementTree', 'ElementTree'], 0) 
70                  cElementTree = p.cElementTree 
71                  ElementTree = p.ElementTree 
72              except ImportError: 
73                  # if you've installed it yourself it comes this way 
74                  import cElementTree, ElementTree 
75      return (ElementTree, cElementTree) 
76   
77 -def importElementTree(): 
78      """Imports ElementTree or the lxml ElementTree API depending on the 
79      Config.use_lxml value and whether the lxml package is found. 
80      @rtype: module 
81      @return: the element tree module that has been imported 
82      """ 
83      return importElementTreeAndCElementTree()[0] 
84