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//proc/self/root/lib/python3/dist-packages/twisted/web/_auth/basic.py

# -*- test-case-name: twisted.web.test.test_httpauth -*-
# Copyright (c) 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}
"""

from __future__ import division, absolute_import

import binascii

from zope.interface import implementer

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

@implementer(ICredentialFactory)
class BasicCredentialFactory(object):
    """
    Credential Factory for HTTP Basic Authentication

@type authenticationRealm: L{bytes}
    @ivar authenticationRealm: The HTTP authentication realm which will be issued in
        challenges.
    """

scheme = b'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 + b'===')
        except binascii.Error:
            raise error.LoginFailed('Invalid credentials')

creds = creds.split(b':', 1)
        if len(creds) == 2:
            return credentials.UsernamePassword(*creds)
        else:
            raise error.LoginFailed('Invalid credentials')