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# -*- test-case-name: twisted.web.test.test_httpauth -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Implementation of RFC2617: HTTP Digest Authentication

@see: U{http://www.faqs.org/rfcs/rfc2617.html}
"""


from zope.interface import implementer

from twisted.cred import credentials
from twisted.web.iweb import ICredentialFactory


@implementer(ICredentialFactory)
class DigestCredentialFactory:
    """
    Wrapper for L{digest.DigestCredentialFactory} that implements the
    L{ICredentialFactory} interface.
    """

    scheme = b"digest"

    def __init__(self, algorithm, authenticationRealm):
        """
        Create the digest credential factory that this object wraps.
        """
        self.digest = credentials.DigestCredentialFactory(
            algorithm, authenticationRealm
        )

    def getChallenge(self, request):
        """
        Generate the challenge for use in the WWW-Authenticate header

        @param request: The L{IRequest} to with access was denied and for the
            response to which this challenge is being generated.

        @return: The L{dict} that can be used to generate a WWW-Authenticate
            header.
        """
        return self.digest.getChallenge(request.getClientAddress().host)