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