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