213 lines
7.3 KiB
Python
213 lines
7.3 KiB
Python
"""
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Creates permissions for all installed apps that need permissions.
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"""
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from __future__ import unicode_literals
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import getpass
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import unicodedata
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from django.apps import apps
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from django.contrib.auth import (models as auth_app, get_permission_codename,
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get_user_model)
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from django.core import exceptions
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from django.core.management.base import CommandError
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from django.db import DEFAULT_DB_ALIAS, router
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from django.db.models import signals
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from django.utils.encoding import DEFAULT_LOCALE_ENCODING
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from django.utils import six
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from django.utils.six.moves import input
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def _get_all_permissions(opts, ctype):
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"""
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Returns (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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_check_permission_clashing(custom, builtin, ctype)
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return builtin + custom
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def _get_builtin_permissions(opts):
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"""
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Returns (codename, name) for all autogenerated permissions.
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By default, this is ('add', 'change', 'delete')
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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((get_permission_codename(action, opts),
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'Can %s %s' % (action, opts.verbose_name_raw)))
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return perms
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def _check_permission_clashing(custom, builtin, ctype):
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"""
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Check that permissions for a model do not clash. Raises CommandError if
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there are duplicate permissions.
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"""
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pool = set()
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builtin_codenames = set(p[0] for p in builtin)
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for codename, _name in custom:
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if codename in pool:
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raise CommandError(
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"The permission codename '%s' is duplicated for model '%s.%s'." %
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(codename, ctype.app_label, ctype.model_class().__name__))
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elif codename in builtin_codenames:
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raise CommandError(
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"The permission codename '%s' clashes with a builtin permission "
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"for model '%s.%s'." %
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(codename, ctype.app_label, ctype.model_class().__name__))
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pool.add(codename)
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def create_permissions(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, **kwargs):
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if not app_config.models_module:
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return
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try:
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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(using, Permission):
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return
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from django.contrib.contenttypes.models import ContentType
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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 = list()
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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, ctype):
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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=ctype)
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for ctype, (codename, name) in searched_perms
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if (ctype.pk, codename) not in all_perms
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]
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# Validate the permissions before bulk_creation to avoid cryptic
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# database error when the verbose_name is longer than 50 characters
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permission_name_max_length = Permission._meta.get_field('name').max_length
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verbose_name_max_length = permission_name_max_length - 11 # len('Can change ') prefix
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for perm in perms:
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if len(perm.name) > permission_name_max_length:
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raise exceptions.ValidationError(
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"The verbose_name of %s is longer than %s characters" % (
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perm.content_type,
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verbose_name_max_length,
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)
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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 create_superuser(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, **kwargs):
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try:
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apps.get_model('auth', 'Permission')
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except LookupError:
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return
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UserModel = get_user_model()
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from django.core.management import call_command
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if not UserModel.objects.exists() and interactive:
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msg = ("\nYou have installed Django's auth system, and "
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"don't have any superusers defined.\nWould you like to create one "
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"now? (yes/no): ")
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confirm = input(msg)
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while 1:
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if confirm not in ('yes', 'no'):
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confirm = input('Please enter either "yes" or "no": ')
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continue
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if confirm == 'yes':
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call_command("createsuperuser", interactive=True, database=using)
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break
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def get_system_username():
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"""
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Try to determine the current system user's username.
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:returns: The username as a unicode string, 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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if six.PY2:
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try:
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result = result.decode(DEFAULT_LOCALE_ENCODING)
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except UnicodeDecodeError:
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# UnicodeDecodeError - preventive treatment for non-latin Windows.
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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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# 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 = (unicodedata.normalize('NFKD', default_username)
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.encode('ascii', 'ignore').decode('ascii')
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.replace(' ', '').lower())
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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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signals.post_migrate.connect(create_permissions,
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dispatch_uid="django.contrib.auth.management.create_permissions")
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signals.post_migrate.connect(create_superuser,
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sender=apps.get_app_config('auth'),
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dispatch_uid="django.contrib.auth.management.create_superuser")
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