142 lines
4.5 KiB
Python
142 lines
4.5 KiB
Python
"""
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Creates permissions for all installed apps that need permissions.
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"""
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import getpass
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import unicodedata
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from django.apps import apps as global_apps
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from django.contrib.auth import get_permission_codename
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from django.core import exceptions
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from django.db import DEFAULT_DB_ALIAS, router
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def _get_all_permissions(opts):
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"""
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Return (codename, name) for all permissions in the given opts.
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"""
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builtin = _get_builtin_permissions(opts)
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custom = list(opts.permissions)
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return builtin + custom
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def _get_builtin_permissions(opts):
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"""
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Return (codename, name) for all autogenerated permissions.
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By default, this is ('add', 'change', 'delete', 'view')
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"""
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perms = []
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for action in opts.default_permissions:
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perms.append((
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get_permission_codename(action, opts),
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'Can %s %s' % (action, opts.verbose_name_raw)
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))
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return perms
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def create_permissions(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, apps=global_apps, **kwargs):
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if not app_config.models_module:
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return
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app_label = app_config.label
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try:
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app_config = apps.get_app_config(app_label)
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ContentType = apps.get_model('contenttypes', 'ContentType')
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Permission = apps.get_model('auth', 'Permission')
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except LookupError:
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return
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if not router.allow_migrate_model(using, Permission):
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return
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# This will hold the permissions we're looking for as
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# (content_type, (codename, name))
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searched_perms = []
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# The codenames and ctypes that should exist.
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ctypes = set()
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for klass in app_config.get_models():
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# Force looking up the content types in the current database
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# before creating foreign keys to them.
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ctype = ContentType.objects.db_manager(using).get_for_model(klass)
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ctypes.add(ctype)
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for perm in _get_all_permissions(klass._meta):
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searched_perms.append((ctype, perm))
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# Find all the Permissions that have a content_type for a model we're
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# looking for. We don't need to check for codenames since we already have
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# a list of the ones we're going to create.
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all_perms = set(Permission.objects.using(using).filter(
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content_type__in=ctypes,
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).values_list(
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"content_type", "codename"
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))
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perms = [
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Permission(codename=codename, name=name, content_type=ct)
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for ct, (codename, name) in searched_perms
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if (ct.pk, codename) not in all_perms
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]
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Permission.objects.using(using).bulk_create(perms)
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if verbosity >= 2:
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for perm in perms:
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print("Adding permission '%s'" % perm)
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def get_system_username():
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"""
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Return the current system user's username, or an empty string if the
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username could not be determined.
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"""
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try:
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result = getpass.getuser()
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except (ImportError, KeyError):
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# KeyError will be raised by os.getpwuid() (called by getuser())
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# if there is no corresponding entry in the /etc/passwd file
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# (a very restricted chroot environment, for example).
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return ''
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return result
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def get_default_username(check_db=True):
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"""
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Try to determine the current system user's username to use as a default.
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:param check_db: If ``True``, requires that the username does not match an
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existing ``auth.User`` (otherwise returns an empty string).
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:returns: The username, or an empty string if no username can be
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determined.
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"""
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# This file is used in apps.py, it should not trigger models import.
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from django.contrib.auth import models as auth_app
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# If the User model has been swapped out, we can't make any assumptions
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# about the default user name.
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if auth_app.User._meta.swapped:
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return ''
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default_username = get_system_username()
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try:
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default_username = (
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unicodedata.normalize('NFKD', default_username)
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.encode('ascii', 'ignore').decode('ascii')
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.replace(' ', '').lower()
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)
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except UnicodeDecodeError:
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return ''
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# Run the username validator
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try:
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auth_app.User._meta.get_field('username').run_validators(default_username)
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except exceptions.ValidationError:
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return ''
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# Don't return the default username if it is already taken.
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if check_db and default_username:
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try:
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auth_app.User._default_manager.get(username=default_username)
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except auth_app.User.DoesNotExist:
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pass
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else:
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return ''
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return default_username
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