app/django/contrib/auth/__init__.py
author Daniel Hans <Daniel.M.Hans@gmail.com>
Sat, 14 Nov 2009 23:27:03 +0100
changeset 3091 a48f4e860f7b
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Tasks may be deleted by pressing 'Delete' button on the edit view. An organization admin may delete a task entity, if the task is not claimed by anyone. Issue 695 fixed.
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import datetime
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from django.core.exceptions import ImproperlyConfigured
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SESSION_KEY = '_auth_user_id'
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BACKEND_SESSION_KEY = '_auth_user_backend'
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REDIRECT_FIELD_NAME = 'next'
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def load_backend(path):
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    i = path.rfind('.')
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    module, attr = path[:i], path[i+1:]
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    try:
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        mod = __import__(module, {}, {}, [attr])
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    except ImportError, e:
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        raise ImproperlyConfigured, 'Error importing authentication backend %s: "%s"' % (module, e)
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    except ValueError, e:
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        raise ImproperlyConfigured, 'Error importing authentication backends. Is AUTHENTICATION_BACKENDS a correctly defined list or tuple?'
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    try:
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        cls = getattr(mod, attr)
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    except AttributeError:
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        raise ImproperlyConfigured, 'Module "%s" does not define a "%s" authentication backend' % (module, attr)
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    return cls()
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def get_backends():
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    from django.conf import settings
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    backends = []
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    for backend_path in settings.AUTHENTICATION_BACKENDS:
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        backends.append(load_backend(backend_path))
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    return backends
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def authenticate(**credentials):
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    """
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    If the given credentials are valid, return a User object.
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    """
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    for backend in get_backends():
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        try:
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            user = backend.authenticate(**credentials)
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        except TypeError:
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            # This backend doesn't accept these credentials as arguments. Try the next one.
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            continue
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        if user is None:
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            continue
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        # Annotate the user object with the path of the backend.
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        user.backend = "%s.%s" % (backend.__module__, backend.__class__.__name__)
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        return user
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def login(request, user):
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    """
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    Persist a user id and a backend in the request. This way a user doesn't
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    have to reauthenticate on every request.
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    """
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    if user is None:
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        user = request.user
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    # TODO: It would be nice to support different login methods, like signed cookies.
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    user.last_login = datetime.datetime.now()
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    user.save()
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    if SESSION_KEY in request.session:
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        if request.session[SESSION_KEY] != user.id:
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            # To avoid reusing another user's session, create a new, empty
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            # session if the existing session corresponds to a different
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            # authenticated user.
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            request.session.flush()
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    else:
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        request.session.cycle_key()
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    request.session[SESSION_KEY] = user.id
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    request.session[BACKEND_SESSION_KEY] = user.backend
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    if hasattr(request, 'user'):
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        request.user = user
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def logout(request):
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    """
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    Removes the authenticated user's ID from the request and flushes their
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    session data.
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    """
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    request.session.flush()
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    if hasattr(request, 'user'):
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        from django.contrib.auth.models import AnonymousUser
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        request.user = AnonymousUser()
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def get_user(request):
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    from django.contrib.auth.models import AnonymousUser
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    try:
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        user_id = request.session[SESSION_KEY]
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        backend_path = request.session[BACKEND_SESSION_KEY]
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        backend = load_backend(backend_path)
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        user = backend.get_user(user_id) or AnonymousUser()
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    except KeyError:
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        user = AnonymousUser()
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    return user