Extend taggable-mixin to support different Tag models.
Usage is pretty simple. Tag model is default in Taggable constructor but you
can call it with different model like GHOPTaskType that inherits from Tag model.
Both Taggable and Tag models have been updated and they don't use hardcoded Tag
model anymore and instead use cls of class methods or self.__class__. In case
of Taggable it's self.__tag_model.
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.
"""
# 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