Source Code for Module repoze.who.classifiers

 1  from paste.httpheaders import REQUEST_METHOD 
 2  from paste.httpheaders import CONTENT_TYPE 
 3  from paste.httpheaders import USER_AGENT 
 4  from paste.httpheaders import WWW_AUTHENTICATE 
 5   
 6  import zope.interface 
 7  from repoze.who.interfaces import IRequestClassifier 
 8  from repoze.who.interfaces import IChallengeDecider 
 9   
10  _DAV_METHODS = ( 
11      'OPTIONS', 
12      'PROPFIND', 
13      'PROPPATCH', 
14      'MKCOL', 
15      'LOCK', 
16      'UNLOCK', 
17      'TRACE', 
18      'DELETE', 
19      'COPY', 
20      'MOVE' 
21      ) 
22   
23  _DAV_USERAGENTS = ( 
24      'Microsoft Data Access Internet Publishing Provider', 
25      'WebDrive', 
26      'Zope External Editor', 
27      'WebDAVFS', 
28      'Goliath', 
29      'neon', 
30      'davlib', 
31      'wsAPI', 
32      'Microsoft-WebDAV' 
33      ) 
34   
35 -def default_request_classifier(environ): 
36      """ Returns one of the classifiers 'dav', 'xmlpost', or 'browser', 
37      depending on the imperative logic below""" 
38      request_method = REQUEST_METHOD(environ) 
39      if request_method in _DAV_METHODS: 
40          return 'dav' 
41      useragent = USER_AGENT(environ) 
42      if useragent: 
43          for agent in _DAV_USERAGENTS: 
44              if useragent.find(agent) != -1: 
45                  return 'dav' 
46      if request_method == 'POST': 
47          if CONTENT_TYPE(environ) == 'text/xml': 
48              return 'xmlpost' 
49      return 'browser' 
50  zope.interface.directlyProvides(default_request_classifier, IRequestClassifier) 
51   
52 -def default_challenge_decider(environ, status, headers): 
53      return status.startswith('401 ') 
54  zope.interface.directlyProvides(default_challenge_decider, IChallengeDecider) 
55   
56 -def passthrough_challenge_decider(environ, status, headers): 
57      """ Don't challenge for pre-challenged responses. 
58   
59      o Assume responsese with 'WWW-Authenticate' or an HTML content type 
60        are pre-challenged. 
61      """ 
62      if not status.startswith('401 '): 
63          return False 
64      h_dict = dict(headers) 
65      if 'WWW-Authenticate' in h_dict: 
66          return False 
67      ct = h_dict.get('Content-Type') 
68      if ct is not None: 
69          return not ct.startswith('text/html') 
70      return True 
71  zope.interface.directlyProvides(passthrough_challenge_decider, 
72                                  IChallengeDecider) 
73