import string

from django.db.models import Q

OBJECTPERMISSION_OBJECT_TYPES = (
    (Q(public=True) & ~Q(app_label='core', model='objecttype'))
    | Q(app_label='core', model__in=['managedfile'])
    | Q(app_label='extras', model__in=['scriptmodule', 'taggeditem'])
)

CONSTRAINT_TOKEN_USER = '$user'

# Django's four default model permissions. These receive special handling
# (dedicated checkboxes, model properties) and should not be registered
# as custom model actions.
RESERVED_ACTIONS = ('view', 'add', 'change', 'delete')

# API tokens
TOKEN_PREFIX = 'nbt_'  # Used for v2 tokens only
TOKEN_KEY_LENGTH = 12
TOKEN_DEFAULT_LENGTH = 40
TOKEN_CHARSET = string.ascii_letters + string.digits