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Creates permissions for all installed apps that need permissions.
from __future__ import unicode_literals
import getpass
import unicodedata
from django.apps import apps
from django.contrib.auth import get_permission_codename
from django.core import exceptions
from import CommandError
from django.db import DEFAULT_DB_ALIAS, router
from django.utils import six
from django.utils.encoding import DEFAULT_LOCALE_ENCODING
def _get_all_permissions(opts, ctype):
Returns (codename, name) for all permissions in the given opts.
builtin = _get_builtin_permissions(opts)
custom = list(opts.permissions)
_check_permission_clashing(custom, builtin, ctype)
return builtin + custom
def _get_builtin_permissions(opts):
Returns (codename, name) for all autogenerated permissions.
By default, this is ('add', 'change', 'delete')
perms = []
for action in opts.default_permissions:
perms.append((get_permission_codename(action, opts),
'Can %s %s' % (action, opts.verbose_name_raw)))
return perms
def _check_permission_clashing(custom, builtin, ctype):
Check that permissions for a model do not clash. Raises CommandError if
there are duplicate permissions.
pool = set()
builtin_codenames = set(p[0] for p in builtin)
for codename, _name in custom:
if codename in pool:
raise CommandError(
"The permission codename '%s' is duplicated for model '%s.%s'." %
(codename, ctype.app_label, ctype.model_class().__name__))
elif codename in builtin_codenames:
raise CommandError(
"The permission codename '%s' clashes with a builtin permission "
"for model '%s.%s'." %
(codename, ctype.app_label, ctype.model_class().__name__))
def create_permissions(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, **kwargs):
if not app_config.models_module:
Permission = apps.get_model('auth', 'Permission')
except LookupError:
if not router.allow_migrate_model(using, Permission):
from django.contrib.contenttypes.models import ContentType
permission_name_max_length = Permission._meta.get_field('name').max_length
verbose_name_max_length = permission_name_max_length - 11 # len('Can change ') prefix
# This will hold the permissions we're looking for as
# (content_type, (codename, name))
searched_perms = list()
# The codenames and ctypes that should exist.
ctypes = set()
for klass in app_config.get_models():
# Force looking up the content types in the current database
# before creating foreign keys to them.
ctype = ContentType.objects.db_manager(using).get_for_model(klass)
if len(klass._meta.verbose_name) > verbose_name_max_length:
raise exceptions.ValidationError(
"The verbose_name of %s.%s is longer than %s characters" % (
for perm in _get_all_permissions(klass._meta, ctype):
searched_perms.append((ctype, perm))
# Find all the Permissions that have a content_type for a model we're
# looking for. We don't need to check for codenames since we already have
# a list of the ones we're going to create.
all_perms = set(Permission.objects.using(using).filter(
"content_type", "codename"
perms = [
Permission(codename=codename, name=name, content_type=ct)
for ct, (codename, name) in searched_perms
if (, codename) not in all_perms
# Validate the permissions before bulk_creation to avoid cryptic database
# error when the name is longer than 255 characters
for perm in perms:
if len( > permission_name_max_length:
raise exceptions.ValidationError(
"The permission name %s of %s.%s is longer than %s characters" % (,
if verbosity >= 2:
for perm in perms:
print("Adding permission '%s'" % perm)
def get_system_username():
Try to determine the current system user's username.
:returns: The username as a unicode string, or an empty string if the
username could not be determined.
result = getpass.getuser()
except (ImportError, KeyError):
# KeyError will be raised by os.getpwuid() (called by getuser())
# if there is no corresponding entry in the /etc/passwd file
# (a very restricted chroot environment, for example).
return ''
if six.PY2:
result = result.decode(DEFAULT_LOCALE_ENCODING)
except UnicodeDecodeError:
# UnicodeDecodeError - preventive treatment for non-latin Windows.
return ''
return result
def get_default_username(check_db=True):
Try to determine the current system user's username to use as a default.
:param check_db: If ``True``, requires that the username does not match an
existing ``auth.User`` (otherwise returns an empty string).
:returns: The username, or an empty string if no username can be
# This file is used in, it should not trigger models import.
from django.contrib.auth import models as auth_app
# If the User model has been swapped out, we can't make any assumptions
# about the default user name.
if auth_app.User._meta.swapped:
return ''
default_username = get_system_username()
default_username = (unicodedata.normalize('NFKD', default_username)
.encode('ascii', 'ignore').decode('ascii')
.replace(' ', '').lower())
except UnicodeDecodeError:
return ''
# Run the username validator
except exceptions.ValidationError:
return ''
# Don't return the default username if it is already taken.
if check_db and default_username:
except auth_app.User.DoesNotExist:
return ''
return default_username
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