Source Code for Package ndg.xacml.core.context

 1  """NDG XACML context package defines classes for types in the access control 
 2  context schema 
 3   
 4  NERC DataGrid 
 5  """ 
 6  __author__ = "P J Kershaw" 
 7  __date__ = "24/03/10" 
 8  __copyright__ = "(C) 2010 Science and Technology Facilities Council" 
 9  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
10  __license__ = "BSD - see LICENSE file in top-level directory" 
11  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
12  __revision__ = "$Id: __init__.py 8010 2012-01-30 16:24:06Z rwilkinson $" 
13  from ndg.xacml.utils import TypedList 
14  from ndg.xacml.core import XacmlCoreBase 
15  from ndg.xacml.core.attribute import Attribute 
16   
17   
18 -class XacmlContextBase(XacmlCoreBase): 
19      """Base class for XACML Request and Response types 
20       
21      @cvar ELEMENT_LOCAL_NAME: XML local element name, derived classes should 
22      set 
23      @type ELEMENT_LOCAL_NAME: None""" 
24      XACML_2_0_CONTEXT_NS = XacmlCoreBase.XACML_2_0_NS_PREFIX + ':context:schema:os' 
25      XACML_2_0_CONTEXT_NS_PREFIX = 'xacml-context' 
26   
27      ELEMENT_LOCAL_NAME = None 
28      __slots__ = () 
29       
30 -    def __init__(self): 
31          """ELEMENT_LOCAL_NAME check makes this class virtual - derived classes 
32          must override this method and set ELEMENT_LOCAL_NAME to the appropriate 
33          string 
34          """ 
35          super(XacmlContextBase, self).__init__() 
36          if self.__class__.ELEMENT_LOCAL_NAME is None: 
37              raise NotImplementedError('Set "ELEMENT_LOCAL_NAME" in a derived ' 
38                                        'type') 
39   
40 -    def __getstate__(self): 
41          '''Enable pickling 
42           
43          @return: object's attribute dictionary 
44          @rtype: dict 
45          ''' 
46          _dict = super(XacmlContextBase, self).__getstate__() 
47          for attrName in XacmlContextBase.__slots__: 
48              # Ugly hack to allow for derived classes setting private member 
49              # variables 
50              if attrName.startswith('__'): 
51                  attrName = "_XacmlContextBase" + attrName 
52                   
53              _dict[attrName] = getattr(self, attrName) 
54               
55          return _dict 
56   
57 -    def __setstate__(self, attrDict): 
58          '''Explicit implementation needed with __slots__''' 
59          for attr, val in attrDict.items(): 
60              setattr(self, attr, val) 
61   
62 -class RequestChildBase(XacmlContextBase): 
63      """Base class for XACML Context Subject, Resource, Action and Environment 
64      types 
65       
66      @ivar __attributes: XACML Context subject attributes 
67      @type __attributes: ndg.xacml.utils.TypedList 
68      """ 
69      __slots__ = ('__attributes', ) 
70       
71 -    def __init__(self): 
72          """Initialise attribute list""" 
73          super(RequestChildBase, self).__init__() 
74          self.__attributes = TypedList(Attribute) 
75           
76      @property 
77 -    def attributes(self): 
78          """ 
79          @return: XACML Context subject attributes 
80          @rtype: ndg.xacml.utils.TypedList 
81          """ 
82          return self.__attributes 
83   
84 -    def __getstate__(self): 
85          '''Enable pickling 
86           
87          @return: object's attribute dictionary 
88          @rtype: dict 
89          ''' 
90          _dict = super(RequestChildBase, self).__getstate__() 
91          for attrName in RequestChildBase.__slots__: 
92              # Ugly hack to allow for derived classes setting private member 
93              # variables 
94              if attrName.startswith('__'): 
95                  attrName = "_RequestChildBase" + attrName 
96              _dict[attrName] = getattr(self, attrName) 
97          return _dict 
98