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"""
Creates permissions for all installed apps that need permissions.
"""
import getpass
import unicodedata
from django.apps import apps as global_apps
from django.contrib.auth import get_permission_codename
from django.contrib.contenttypes.management import create_contenttypes
from django.core import exceptions
from django.db import DEFAULT_DB_ALIAS, router
def _get_all_permissions(opts):
"""
Return (codename, name) for all permissions in the given opts.
"""
return [*_get_builtin_permissions(opts), *opts.permissions]
def _get_builtin_permissions(opts):
"""
Return (codename, name) for all autogenerated permissions.
By default, this is ('add', 'change', 'delete', 'view')
"""
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 create_permissions(
app_config,
verbosity=2,
interactive=True,
using=DEFAULT_DB_ALIAS,
apps=global_apps,
**kwargs,
):
if not app_config.models_module:
return
try:
Permission = apps.get_model("auth", "Permission")
except LookupError:
return
if not router.allow_migrate_model(using, Permission):
return
# Ensure that contenttypes are created for this app. Needed if
# 'django.contrib.auth' is in INSTALLED_APPS before
# 'django.contrib.contenttypes'.
create_contenttypes(
app_config,
verbosity=verbosity,
interactive=interactive,
using=using,
apps=apps,
**kwargs,
)
app_label = app_config.label
try:
app_config = apps.get_app_config(app_label)
ContentType = apps.get_model("contenttypes", "ContentType")
except LookupError:
return
models = list(app_config.get_models())
# Grab all the ContentTypes.
ctypes = ContentType.objects.db_manager(using).get_for_models(
*models, for_concrete_models=False
)
# 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__in=set(ctypes.values()),
)
.values_list("content_type", "codename")
)
perms = []
for model in models:
ctype = ctypes[model]
for codename, name in _get_all_permissions(model._meta):
if (ctype.pk, codename) not in all_perms:
permission = Permission()
permission._state.db = using
permission.codename = codename
permission.name = name
permission.content_type = ctype
perms.append(permission)
Permission.objects.using(using).bulk_create(perms)
if verbosity >= 2:
for perm in perms:
print("Adding permission '%s'" % perm)
def get_system_username():
"""
Return the current system user's username, or an empty string if the
username could not be determined.
"""
try:
result = getpass.getuser()
except (ImportError, KeyError, OSError):
# TODO: Drop ImportError and KeyError when dropping support for PY312.
# KeyError (Python <3.13) or OSError (Python 3.13+) will be raised by
# os.getpwuid() (called by getuser()) if there is no corresponding
# entry in the /etc/passwd file (for example, in a very restricted
# chroot environment).
return ""
return result
def get_default_username(check_db=True, database=DEFAULT_DB_ALIAS):
"""
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).
:param database: The database where the unique check will be performed.
:returns: The username, or an empty string if no username can be
determined or the suggested username is already taken.
"""
# This file is used in apps.py, 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()
try:
default_username = (
unicodedata.normalize("NFKD", default_username)
.encode("ascii", "ignore")
.decode("ascii")
.replace(" ", "")
.lower()
)
except UnicodeDecodeError:
return ""
# Run the username validator
try:
auth_app.User._meta.get_field("username").run_validators(default_username)
except exceptions.ValidationError:
return ""
# Don't return the default username if it is already taken.
if check_db and default_username:
try:
auth_app.User._default_manager.db_manager(database).get(
username=default_username,
)
except auth_app.User.DoesNotExist:
pass
else:
return ""
return default_username
|
