142 lines
5.2 KiB
Python
142 lines
5.2 KiB
Python
try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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from django.db import connection
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from django.contrib.auth.models import User
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class ModelBackend(object):
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"""
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Authenticates against django.contrib.auth.models.User.
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"""
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# TODO: Model, login attribute name and password attribute name should be
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# configurable.
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def authenticate(self, username=None, password=None):
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try:
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user = User.objects.get(username=username)
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if user.check_password(password):
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return user
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except User.DoesNotExist:
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return None
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def get_group_permissions(self, user_obj):
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"""
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Returns a set of permission strings that this user has through his/her
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groups.
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"""
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if not hasattr(user_obj, '_group_perm_cache'):
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cursor = connection.cursor()
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# The SQL below works out to the following, after DB quoting:
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# cursor.execute("""
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# SELECT ct."app_label", p."codename"
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# FROM "auth_permission" p, "auth_group_permissions" gp, "auth_user_groups" ug, "django_content_type" ct
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# WHERE p."id" = gp."permission_id"
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# AND gp."group_id" = ug."group_id"
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# AND ct."id" = p."content_type_id"
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# AND ug."user_id" = %s, [self.id])
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qn = connection.ops.quote_name
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sql = """
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SELECT ct.%s, p.%s
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FROM %s p, %s gp, %s ug, %s ct
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WHERE p.%s = gp.%s
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AND gp.%s = ug.%s
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AND ct.%s = p.%s
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AND ug.%s = %%s""" % (
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qn('app_label'), qn('codename'),
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qn('auth_permission'), qn('auth_group_permissions'),
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qn('auth_user_groups'), qn('django_content_type'),
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qn('id'), qn('permission_id'),
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qn('group_id'), qn('group_id'),
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qn('id'), qn('content_type_id'),
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qn('user_id'),)
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cursor.execute(sql, [user_obj.id])
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user_obj._group_perm_cache = set(["%s.%s" % (row[0], row[1]) for row in cursor.fetchall()])
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return user_obj._group_perm_cache
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def get_all_permissions(self, user_obj):
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if not hasattr(user_obj, '_perm_cache'):
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user_obj._perm_cache = set([u"%s.%s" % (p.content_type.app_label, p.codename) for p in user_obj.user_permissions.select_related()])
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user_obj._perm_cache.update(self.get_group_permissions(user_obj))
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return user_obj._perm_cache
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def has_perm(self, user_obj, perm):
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return perm in self.get_all_permissions(user_obj)
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def has_module_perms(self, user_obj, app_label):
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"""
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Returns True if user_obj has any permissions in the given app_label.
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"""
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for perm in self.get_all_permissions(user_obj):
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if perm[:perm.index('.')] == app_label:
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return True
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return False
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def get_user(self, user_id):
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try:
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return User.objects.get(pk=user_id)
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except User.DoesNotExist:
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return None
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class RemoteUserBackend(ModelBackend):
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"""
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This backend is to be used in conjunction with the ``RemoteUserMiddleware``
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found in the middleware module of this package, and is used when the server
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is handling authentication outside of Django.
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By default, the ``authenticate`` method creates ``User`` objects for
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usernames that don't already exist in the database. Subclasses can disable
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this behavior by setting the ``create_unknown_user`` attribute to
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``False``.
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"""
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# Create a User object if not already in the database?
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create_unknown_user = True
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def authenticate(self, remote_user):
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"""
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The username passed as ``remote_user`` is considered trusted. This
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method simply returns the ``User`` object with the given username,
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creating a new ``User`` object if ``create_unknown_user`` is ``True``.
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Returns None if ``create_unknown_user`` is ``False`` and a ``User``
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object with the given username is not found in the database.
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"""
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if not remote_user:
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return
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user = None
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username = self.clean_username(remote_user)
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# Note that this could be accomplished in one try-except clause, but
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# instead we use get_or_create when creating unknown users since it has
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# built-in safeguards for multiple threads.
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if self.create_unknown_user:
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user, created = User.objects.get_or_create(username=username)
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if created:
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user = self.configure_user(user)
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else:
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try:
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user = User.objects.get(username=username)
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except User.DoesNotExist:
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pass
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return user
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def clean_username(self, username):
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"""
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Performs any cleaning on the "username" prior to using it to get or
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create the user object. Returns the cleaned username.
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By default, returns the username unchanged.
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"""
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return username
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def configure_user(self, user):
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"""
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Configures a user after creation and returns the updated user.
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By default, returns the user unmodified.
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"""
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return user
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