Source Code for Module ndg.xacml.finder.defaultfinder

 1  """NDG XACML policy finder resolving within base policy document 
 2   
 3  NERC DataGrid 
 4  """ 
 5  __author__ = "R B Wilkinson" 
 6  __date__ = "03/11/11" 
 7  __copyright__ = "(C) 2011 Science and Technology Facilities Council" 
 8  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
 9  __license__ = "BSD - see LICENSE file in top-level directory" 
10  __contact__ = "Philip.Kershaw@stfc.ac.uk" 
11  __revision__ = "$Id$" 
12   
13  import os 
14   
15  from ndg.xacml.finder.urlpolicyfinder import UrlPolicyFinder 
16   
17 -def getDefaultPolicyFinder(source): 
18      """ 
19      Constructs a default policy finder, using the location of root policy file 
20      if this can be determined. This implementation always returns a 
21      UrlPolicyFinder. 
22      @param: source 
23      @type: string, file, XML node type 
24      @return: default policy finder 
25      @rtype: subclass of ndg.xacml.finder.policyfinderbase.PolicyFinderBase 
26      """ 
27      # The base path defaults to the location of the source policy if this can be 
28      # deduced. 
29      basePath = None 
30      if isinstance(source, str): 
31          if os.path.exists(source): 
32              basePath = os.path.dirname(source) 
33      elif isinstance(source, file): 
34          if hasattr(file, 'name') and file.name: 
35              basePath = os.path.dirname(file.name) 
36      finder = UrlPolicyFinder(basePath) 
37      return finder 
38