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Viewing changes to vendor/Twisted-10.0.0/twisted/web/_auth/basic.py

  • Committer: Jesse Andrews
  • Date: 2010-05-28 06:05:26 UTC
  • Revision ID: git-v1:bf6e6e718cdc7488e2da87b21e258ccc065fe499
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vendor/Twisted-10.0.0/twisted/web/_auth/basic.py
 
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# -*- test-case-name: twisted.web.test.test_httpauth -*-
 
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# Copyright (c) 2008 Twisted Matrix Laboratories.
 
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# See LICENSE for details.
 
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"""
 
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HTTP BASIC authentication.
 
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@see: U{http://tools.ietf.org/html/rfc1945}
 
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@see: U{http://tools.ietf.org/html/rfc2616}
 
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@see: U{http://tools.ietf.org/html/rfc2617}
 
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"""
 
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import binascii
 
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from zope.interface import implements
 
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from twisted.cred import credentials, error
 
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from twisted.web.iweb import ICredentialFactory
 
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class BasicCredentialFactory(object):
 
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    """
 
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    Credential Factory for HTTP Basic Authentication
 
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    @type authenticationRealm: C{str}
 
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    @ivar authenticationRealm: The HTTP authentication realm which will be issued in
 
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        challenges.
 
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    """
 
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    implements(ICredentialFactory)
 
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    scheme = 'basic'
 
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    def __init__(self, authenticationRealm):
 
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        self.authenticationRealm = authenticationRealm
 
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    def getChallenge(self, request):
 
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        """
 
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        Return a challenge including the HTTP authentication realm with which
 
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        this factory was created.
 
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        """
 
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        return {'realm': self.authenticationRealm}
 
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    def decode(self, response, request):
 
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        """
 
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        Parse the base64-encoded, colon-separated username and password into a
 
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        L{credentials.UsernamePassword} instance.
 
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        """
 
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        try:
 
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            creds = binascii.a2b_base64(response + '===')
 
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        except binascii.Error:
 
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            raise error.LoginFailed('Invalid credentials')
 
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        creds = creds.split(':', 1)
 
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        if len(creds) == 2:
 
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            return credentials.UsernamePassword(*creds)
 
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        else:
 
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            raise error.LoginFailed('Invalid credentials')