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multi-auth: Implemented new auth api.

git-svn-id: http://code.djangoproject.com/svn/django/branches/multi-auth@2884 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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jkocherhans committed May 10, 2006
1 parent 0990cce commit 0cd180cf76faf5f2c2cd41ad0992fc4a9daf42b9
Showing with 69 additions and 0 deletions.
  1. +69 −0 django/contrib/auth/__init__.py
@@ -1,2 +1,71 @@
from django.core.exceptions import ImproperlyConfigured
SESSION_KEY = '_auth_user_id'
BACKEND_SESSION_KEY = '_auth_user_backend'
LOGIN_URL = '/accounts/login/'
REDIRECT_FIELD_NAME = 'next'
def load_backend(path):
i = path.rfind('.')
module, attr = path[:i], path[i+1:]
try:
mod = __import__(module, '', '', [attr])
except ImportError, e:
raise ImproperlyConfigured, 'Error importing authentication backend %s: "%s"' % (module, e)
try:
cls = getattr(mod, attr)
except AttributeError:
raise ImproperlyConfigured, 'Module "%s" does not define a "%s" authentication backend' % (module, attr)
return cls()
def get_backends():
from django.conf import settings
backends = []
for backend_path in settings.AUTHENTICATION_BACKENDS:
backends.append(load_backend(backend_path))
return backends
def authenticate(**credentials):
"""
If the given credentials, return a user object.
"""
for backend in get_backends():
try:
user = backend.authenticate(**credentials)
except TypeError:
# this backend doesn't accept these credentials as arguments, try the next one.
continue
if user is None:
continue
# annotate the user object with the path of the backend
user.backend = str(backend.__class__)
return user
def login(request, user):
"""
Persist a user id and a backend in the request. This way a user doesn't
have to reauthenticate on every request.
"""
if user is None:
user = request.user
# TODO: It would be nice to support different login methods, like signed cookies.
request.session[SESSION_KEY] = user.id
request.session[BACKEND_SESSION_KEY] = user.backend
def logout(request):
"""
Remove the authenticated user's id from request.
"""
del request.session[SESSION_KEY]
del request.session[BACKEND_SESSION_KEY]
def get_user(request):
from django.contrib.auth.models import AnonymousUser
try:
user_id = request.session[SESSION_KEY]
backend_path = request.session[BACKEND_SESSION_KEY]
backend = load_backend(backend_path)
user = backend.get_user(user_id) or AnonymousUser()
except KeyError:
user = AnonymousUser()
return user

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