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80 lines
3.5 KiB
Python
80 lines
3.5 KiB
Python
"""The :mod:`authenticators` modules provides for pluggable authentication behaviour.
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Authentication behaviour is provided by adding the mixin class :class:`AuthenticatorMixin` to a :class:`.Resource` or Django :class:`View` class.
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The set of authenticators which are use is then specified by setting the :attr:`authenticators` attribute on the class, and listing a set of authenticator classes.
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"""
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from django.contrib.auth import authenticate
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from django.middleware.csrf import CsrfViewMiddleware
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from djangorestframework.utils import as_tuple
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import base64
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class AuthenticatorMixin(object):
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"""Adds pluggable authentication behaviour."""
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"""The set of authenticators to use."""
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authenticators = None
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def authenticate(self, request):
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"""Attempt to authenticate the request, returning an authentication context or None.
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An authentication context may be any object, although in many cases it will simply be a :class:`User` instance."""
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# Attempt authentication against each authenticator in turn,
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# and return None if no authenticators succeed in authenticating the request.
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for authenticator in as_tuple(self.authenticators):
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auth_context = authenticator(self).authenticate(request)
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if auth_context:
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return auth_context
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return None
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class BaseAuthenticator(object):
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"""All authenticators should extend BaseAuthenticator."""
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def __init__(self, mixin):
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"""Initialise the authenticator with the mixin instance as state,
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in case the authenticator needs to access any metadata on the mixin object."""
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self.mixin = mixin
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def authenticate(self, request):
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"""Authenticate the request and return the authentication context or None.
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An authentication context might be something as simple as a User object, or it might
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be some more complicated token, for example authentication tokens which are signed
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against a particular set of permissions for a given user, over a given timeframe.
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The default permission checking on Resource will use the allowed_methods attribute
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for permissions if the authentication context is not None, and use anon_allowed_methods otherwise.
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The authentication context is passed to the method calls eg Resource.get(request, auth) in order to
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allow them to apply any more fine grained permission checking at the point the response is being generated.
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This function must be overridden to be implemented."""
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return None
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class BasicAuthenticator(BaseAuthenticator):
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"""Use HTTP Basic authentication"""
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def authenticate(self, request):
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if 'HTTP_AUTHORIZATION' in request.META:
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auth = request.META['HTTP_AUTHORIZATION'].split()
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if len(auth) == 2 and auth[0].lower() == "basic":
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uname, passwd = base64.b64decode(auth[1]).split(':')
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user = authenticate(username=uname, password=passwd)
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if user is not None and user.is_active:
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return user
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return None
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class UserLoggedInAuthenticator(BaseAuthenticator):
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"""Use Djagno's built-in request session for authentication."""
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def authenticate(self, request):
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if getattr(request, 'user', None) and request.user.is_active:
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resp = CsrfViewMiddleware().process_view(request, None, (), {})
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if resp is None: # csrf passed
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return request.user
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return None
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