648 lines
24 KiB
Plaintext
648 lines
24 KiB
Plaintext
=======================
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``django.contrib.auth``
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=======================
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This document provides API reference material for the components of Django's
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authentication system. For more details on the usage of these components or
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how to customize authentication and authorization see the :doc:`authentication
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topic guide </topics/auth/index>`.
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.. currentmodule:: django.contrib.auth
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``User`` model
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==============
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Fields
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------
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.. class:: models.User
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:class:`~django.contrib.auth.models.User` objects have the following
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fields:
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.. attribute:: username
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Required. 150 characters or fewer. Usernames may contain alphanumeric,
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``_``, ``@``, ``+``, ``.`` and ``-`` characters.
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The ``max_length`` should be sufficient for many use cases. If you need
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a longer length, please use a :ref:`custom user model
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<specifying-custom-user-model>`. If you use MySQL with the ``utf8mb4``
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encoding (recommended for proper Unicode support), specify at most
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``max_length=191`` because MySQL can only create unique indexes with
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191 characters in that case by default.
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.. admonition:: Usernames and Unicode
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Django originally accepted only ASCII letters in usernames.
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Although it wasn't a deliberate choice, Unicode characters have
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always been accepted when using Python 3. Django 1.10 officially
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added Unicode support in usernames, keeping the ASCII-only behavior
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on Python 2, with the option to customize the behavior using
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:attr:`.User.username_validator`.
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.. versionchanged:: 1.10
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The ``max_length`` increased from 30 to 150 characters.
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.. attribute:: first_name
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Optional. 30 characters or fewer.
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.. attribute:: last_name
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Optional. 30 characters or fewer.
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.. attribute:: email
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Optional. Email address.
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.. attribute:: password
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Required. A hash of, and metadata about, the password. (Django doesn't
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store the raw password.) Raw passwords can be arbitrarily long and can
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contain any character. See the :doc:`password documentation
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</topics/auth/passwords>`.
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.. attribute:: groups
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Many-to-many relationship to :class:`~django.contrib.auth.models.Group`
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.. attribute:: user_permissions
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Many-to-many relationship to :class:`~django.contrib.auth.models.Permission`
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.. attribute:: is_staff
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Boolean. Designates whether this user can access the admin site.
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.. attribute:: is_active
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Boolean. Designates whether this user account should be considered
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active. We recommend that you set this flag to ``False`` instead of
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deleting accounts; that way, if your applications have any foreign keys
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to users, the foreign keys won't break.
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This doesn't necessarily control whether or not the user can log in.
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Authentication backends aren't required to check for the ``is_active``
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flag but the default backend
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(:class:`~django.contrib.auth.backends.ModelBackend`) and the
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:class:`~django.contrib.auth.backends.RemoteUserBackend` do. You can
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use :class:`~django.contrib.auth.backends.AllowAllUsersModelBackend`
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or :class:`~django.contrib.auth.backends.AllowAllUsersRemoteUserBackend`
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if you want to allow inactive users to login. In this case, you'll also
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want to customize the
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:class:`~django.contrib.auth.forms.AuthenticationForm` used by the
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:class:`~django.contrib.auth.views.LoginView` as it rejects inactive
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users. Be aware that the permission-checking methods such as
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:meth:`~django.contrib.auth.models.User.has_perm` and the
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authentication in the Django admin all return ``False`` for inactive
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users.
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.. versionchanged:: 1.10
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In older versions,
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:class:`~django.contrib.auth.backends.ModelBackend` and
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:class:`~django.contrib.auth.backends.RemoteUserBackend` allowed
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inactive users to authenticate.
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.. attribute:: is_superuser
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Boolean. Designates that this user has all permissions without
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explicitly assigning them.
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.. attribute:: last_login
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A datetime of the user's last login.
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.. attribute:: date_joined
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A datetime designating when the account was created. Is set to the
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current date/time by default when the account is created.
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Attributes
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----------
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.. class:: models.User
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.. attribute:: is_authenticated
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Read-only attribute which is always ``True`` (as opposed to
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``AnonymousUser.is_authenticated`` which is always ``False``). This is
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a way to tell if the user has been authenticated. This does not imply
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any permissions and doesn't check if the user is active or has a valid
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session. Even though normally you will check this attribute on
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``request.user`` to find out whether it has been populated by the
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:class:`~django.contrib.auth.middleware.AuthenticationMiddleware`
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(representing the currently logged-in user), you should know this
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attribute is ``True`` for any :class:`~models.User` instance.
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.. versionchanged:: 1.10
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In older versions, this was a method. Backwards-compatibility
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support for using it as a method will be removed in Django 2.0.
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.. attribute:: is_anonymous
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Read-only attribute which is always ``False``. This is a way of
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differentiating :class:`~models.User` and :class:`~models.AnonymousUser`
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objects. Generally, you should prefer using
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:attr:`~django.contrib.auth.models.User.is_authenticated` to this
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attribute.
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.. versionchanged:: 1.10
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In older versions, this was a method. Backwards-compatibility
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support for using it as a method will be removed in Django 2.0.
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.. attribute:: username_validator
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.. versionadded:: 1.10
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Points to a validator instance used to validate usernames. Defaults to
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:class:`validators.UnicodeUsernameValidator` on Python 3 and
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:class:`validators.ASCIIUsernameValidator` on Python 2.
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To change the default username validator, you can subclass the ``User``
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model and set this attribute to a different validator instance. For
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example, to use ASCII usernames on Python 3::
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from django.contrib.auth.models import User
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from django.contrib.auth.validators import ASCIIUsernameValidator
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class CustomUser(User):
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username_validator = ASCIIUsernameValidator()
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class Meta:
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proxy = True # If no new field is added.
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Methods
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-------
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.. class:: models.User
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.. method:: get_username()
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Returns the username for the user. Since the User model can be swapped
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out, you should use this method instead of referencing the username
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attribute directly.
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.. method:: get_full_name()
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Returns the :attr:`~django.contrib.auth.models.User.first_name` plus
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the :attr:`~django.contrib.auth.models.User.last_name`, with a space in
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between.
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.. method:: get_short_name()
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Returns the :attr:`~django.contrib.auth.models.User.first_name`.
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.. method:: set_password(raw_password)
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Sets the user's password to the given raw string, taking care of the
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password hashing. Doesn't save the
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:class:`~django.contrib.auth.models.User` object.
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When the ``raw_password`` is ``None``, the password will be set to an
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unusable password, as if
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:meth:`~django.contrib.auth.models.User.set_unusable_password()`
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were used.
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.. method:: check_password(raw_password)
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Returns ``True`` if the given raw string is the correct password for
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the user. (This takes care of the password hashing in making the
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comparison.)
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.. method:: set_unusable_password()
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Marks the user as having no password set. This isn't the same as
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having a blank string for a password.
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:meth:`~django.contrib.auth.models.User.check_password()` for this user
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will never return ``True``. Doesn't save the
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:class:`~django.contrib.auth.models.User` object.
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You may need this if authentication for your application takes place
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against an existing external source such as an LDAP directory.
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.. method:: has_usable_password()
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Returns ``False`` if
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:meth:`~django.contrib.auth.models.User.set_unusable_password()` has
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been called for this user.
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.. method:: get_group_permissions(obj=None)
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Returns a set of permission strings that the user has, through their
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groups.
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If ``obj`` is passed in, only returns the group permissions for
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this specific object.
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.. method:: get_all_permissions(obj=None)
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Returns a set of permission strings that the user has, both through
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group and user permissions.
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If ``obj`` is passed in, only returns the permissions for this
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specific object.
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.. method:: has_perm(perm, obj=None)
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Returns ``True`` if the user has the specified permission, where perm
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is in the format ``"<app label>.<permission codename>"``. (see
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documentation on :ref:`permissions <topic-authorization>`). If the user is
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inactive, this method will always return ``False``.
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If ``obj`` is passed in, this method won't check for a permission for
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the model, but for this specific object.
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.. method:: has_perms(perm_list, obj=None)
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Returns ``True`` if the user has each of the specified permissions,
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where each perm is in the format
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``"<app label>.<permission codename>"``. If the user is inactive,
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this method will always return ``False``.
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If ``obj`` is passed in, this method won't check for permissions for
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the model, but for the specific object.
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.. method:: has_module_perms(package_name)
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Returns ``True`` if the user has any permissions in the given package
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(the Django app label). If the user is inactive, this method will
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always return ``False``.
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.. method:: email_user(subject, message, from_email=None, **kwargs)
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Sends an email to the user. If ``from_email`` is ``None``, Django uses
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the :setting:`DEFAULT_FROM_EMAIL`. Any ``**kwargs`` are passed to the
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underlying :meth:`~django.core.mail.send_mail()` call.
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Manager methods
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---------------
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.. class:: models.UserManager
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The :class:`~django.contrib.auth.models.User` model has a custom manager
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that has the following helper methods (in addition to the methods provided
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by :class:`~django.contrib.auth.models.BaseUserManager`):
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.. method:: create_user(username, email=None, password=None, **extra_fields)
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Creates, saves and returns a :class:`~django.contrib.auth.models.User`.
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The :attr:`~django.contrib.auth.models.User.username` and
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:attr:`~django.contrib.auth.models.User.password` are set as given. The
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domain portion of :attr:`~django.contrib.auth.models.User.email` is
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automatically converted to lowercase, and the returned
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:class:`~django.contrib.auth.models.User` object will have
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:attr:`~django.contrib.auth.models.User.is_active` set to ``True``.
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If no password is provided,
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:meth:`~django.contrib.auth.models.User.set_unusable_password()` will
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be called.
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The ``extra_fields`` keyword arguments are passed through to the
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:class:`~django.contrib.auth.models.User`’s ``__init__`` method to
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allow setting arbitrary fields on a :ref:`custom User model
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<auth-custom-user>`.
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See :ref:`Creating users <topics-auth-creating-users>` for example usage.
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.. method:: create_superuser(username, email, password, **extra_fields)
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Same as :meth:`create_user`, but sets :attr:`~models.User.is_staff` and
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:attr:`~models.User.is_superuser` to ``True``.
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``AnonymousUser`` object
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========================
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.. class:: models.AnonymousUser
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:class:`django.contrib.auth.models.AnonymousUser` is a class that
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implements the :class:`django.contrib.auth.models.User` interface, with
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these differences:
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* :ref:`id <automatic-primary-key-fields>` is always ``None``.
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* :attr:`~django.contrib.auth.models.User.username` is always the empty
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string.
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* :meth:`~django.contrib.auth.models.User.get_username()` always returns
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the empty string.
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* :attr:`~django.contrib.auth.models.User.is_anonymous` is ``True``
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instead of ``False``.
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* :attr:`~django.contrib.auth.models.User.is_authenticated` is
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``False`` instead of ``True``.
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* :attr:`~django.contrib.auth.models.User.is_staff` and
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:attr:`~django.contrib.auth.models.User.is_superuser` are always
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``False``.
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* :attr:`~django.contrib.auth.models.User.is_active` is always ``False``.
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* :attr:`~django.contrib.auth.models.User.groups` and
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:attr:`~django.contrib.auth.models.User.user_permissions` are always
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empty.
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* :meth:`~django.contrib.auth.models.User.set_password()`,
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:meth:`~django.contrib.auth.models.User.check_password()`,
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:meth:`~django.db.models.Model.save` and
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:meth:`~django.db.models.Model.delete()` raise :exc:`NotImplementedError`.
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In practice, you probably won't need to use
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:class:`~django.contrib.auth.models.AnonymousUser` objects on your own, but
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they're used by Web requests, as explained in the next section.
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``Permission`` model
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====================
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.. class:: models.Permission
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Fields
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------
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:class:`~django.contrib.auth.models.Permission` objects have the following
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fields:
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.. class:: models.Permission
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.. attribute:: name
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Required. 255 characters or fewer. Example: ``'Can vote'``.
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.. attribute:: content_type
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Required. A reference to the ``django_content_type`` database table,
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which contains a record for each installed model.
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.. attribute:: codename
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Required. 100 characters or fewer. Example: ``'can_vote'``.
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Methods
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-------
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:class:`~django.contrib.auth.models.Permission` objects have the standard
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data-access methods like any other :doc:`Django model </ref/models/instances>`.
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``Group`` model
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===============
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.. class:: models.Group
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Fields
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------
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:class:`~django.contrib.auth.models.Group` objects have the following fields:
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.. class:: models.Group
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.. attribute:: name
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Required. 80 characters or fewer. Any characters are permitted. Example:
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``'Awesome Users'``.
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.. attribute:: permissions
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Many-to-many field to :class:`~django.contrib.auth.models.Permission`::
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group.permissions.set([permission_list])
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group.permissions.add(permission, permission, ...)
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group.permissions.remove(permission, permission, ...)
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group.permissions.clear()
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Validators
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==========
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.. class:: validators.ASCIIUsernameValidator
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.. versionadded:: 1.10
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A field validator allowing only ASCII letters, in addition to ``@``, ``.``,
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``+``, ``-``, and ``_``. The default validator for ``User.username`` on
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Python 2.
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.. class:: validators.UnicodeUsernameValidator
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.. versionadded:: 1.10
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A field validator allowing Unicode letters, in addition to ``@``, ``.``,
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``+``, ``-``, and ``_``. The default validator for ``User.username`` on
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Python 3.
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.. _topics-auth-signals:
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Login and logout signals
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========================
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.. module:: django.contrib.auth.signals
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The auth framework uses the following :doc:`signals </topics/signals>` that
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can be used for notification when a user logs in or out.
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.. function:: user_logged_in
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Sent when a user logs in successfully.
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Arguments sent with this signal:
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``sender``
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The class of the user that just logged in.
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``request``
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The current :class:`~django.http.HttpRequest` instance.
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``user``
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The user instance that just logged in.
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.. function:: user_logged_out
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Sent when the logout method is called.
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``sender``
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As above: the class of the user that just logged out or ``None``
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if the user was not authenticated.
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``request``
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The current :class:`~django.http.HttpRequest` instance.
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``user``
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The user instance that just logged out or ``None`` if the
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user was not authenticated.
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.. function:: user_login_failed
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Sent when the user failed to login successfully
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``sender``
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The name of the module used for authentication.
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``credentials``
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A dictionary of keyword arguments containing the user credentials that were
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passed to :func:`~django.contrib.auth.authenticate()` or your own custom
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authentication backend. Credentials matching a set of 'sensitive' patterns,
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(including password) will not be sent in the clear as part of the signal.
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.. _authentication-backends-reference:
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Authentication backends
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=======================
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.. module:: django.contrib.auth.backends
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:synopsis: Django's built-in authentication backend classes.
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This section details the authentication backends that come with Django. For
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information on how to use them and how to write your own authentication
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backends, see the :ref:`Other authentication sources section
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<authentication-backends>` of the :doc:`User authentication guide
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</topics/auth/index>`.
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Available authentication backends
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---------------------------------
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The following backends are available in :mod:`django.contrib.auth.backends`:
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.. class:: ModelBackend
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This is the default authentication backend used by Django. It
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authenticates using credentials consisting of a user identifier and
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password. For Django's default user model, the user identifier is the
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username, for custom user models it is the field specified by
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USERNAME_FIELD (see :doc:`Customizing Users and authentication
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</topics/auth/customizing>`).
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It also handles the default permissions model as defined for
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:class:`~django.contrib.auth.models.User` and
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:class:`~django.contrib.auth.models.PermissionsMixin`.
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:meth:`has_perm`, :meth:`get_all_permissions`, :meth:`get_user_permissions`,
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and :meth:`get_group_permissions` allow an object to be passed as a
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parameter for object-specific permissions, but this backend does not
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implement them other than returning an empty set of permissions if
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``obj is not None``.
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.. method:: authenticate(username=None, password=None, **kwargs)
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Tries to authenticate ``username`` with ``password`` by calling
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:meth:`User.check_password
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<django.contrib.auth.models.User.check_password>`. If no ``username``
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is provided, it tries to fetch a username from ``kwargs`` using the
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key :attr:`CustomUser.USERNAME_FIELD
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<django.contrib.auth.models.CustomUser.USERNAME_FIELD>`. Returns an
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authenticated user or ``None``.
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.. method:: get_user_permissions(user_obj, obj=None)
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Returns the set of permission strings the ``user_obj`` has from their
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own user permissions. Returns an empty set if
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:attr:`~django.contrib.auth.models.AbstractBaseUser.is_anonymous` or
|
||
:attr:`~django.contrib.auth.models.CustomUser.is_active` is ``False``.
|
||
|
||
.. method:: get_group_permissions(user_obj, obj=None)
|
||
|
||
Returns the set of permission strings the ``user_obj`` has from the
|
||
permissions of the groups they belong. Returns an empty set if
|
||
:attr:`~django.contrib.auth.models.AbstractBaseUser.is_anonymous` or
|
||
:attr:`~django.contrib.auth.models.CustomUser.is_active` is ``False``.
|
||
|
||
.. method:: get_all_permissions(user_obj, obj=None)
|
||
|
||
Returns the set of permission strings the ``user_obj`` has, including both
|
||
user permissions and group permissions. Returns an empty set if
|
||
:attr:`~django.contrib.auth.models.AbstractBaseUser.is_anonymous` or
|
||
:attr:`~django.contrib.auth.models.CustomUser.is_active` is ``False``.
|
||
|
||
.. method:: has_perm(user_obj, perm, obj=None)
|
||
|
||
Uses :meth:`get_all_permissions` to check if ``user_obj`` has the
|
||
permission string ``perm``. Returns ``False`` if the user is not
|
||
:attr:`~django.contrib.auth.models.CustomUser.is_active`.
|
||
|
||
.. method:: has_module_perms(self, user_obj, app_label)
|
||
|
||
Returns whether the ``user_obj`` has any permissions on the app
|
||
``app_label``.
|
||
|
||
.. method:: ModelBackend.user_can_authenticate()
|
||
|
||
.. versionadded:: 1.10
|
||
|
||
Returns whether the user is allowed to authenticate. To match the
|
||
behavior of :class:`~django.contrib.auth.forms.AuthenticationForm`
|
||
which :meth:`prohibits inactive users from logging in
|
||
<django.contrib.auth.forms.AuthenticationForm.confirm_login_allowed>`,
|
||
this method returns ``False`` for users with :attr:`is_active=False
|
||
<django.contrib.auth.models.User.is_active>`. Custom user models that
|
||
don't have an :attr:`~django.contrib.auth.models.CustomUser.is_active`
|
||
field are allowed.
|
||
|
||
.. class:: AllowAllUsersModelBackend
|
||
|
||
.. versionadded:: 1.10
|
||
|
||
Same as :class:`ModelBackend` except that it doesn't reject inactive users
|
||
because :meth:`~ModelBackend.user_can_authenticate` always returns ``True``.
|
||
|
||
When using this backend, you'll likely want to customize the
|
||
:class:`~django.contrib.auth.forms.AuthenticationForm` used by the
|
||
:class:`~django.contrib.auth.views.LoginView` by overriding the
|
||
:meth:`~django.contrib.auth.forms.AuthenticationForm.confirm_login_allowed`
|
||
method as it rejects inactive users.
|
||
|
||
.. class:: RemoteUserBackend
|
||
|
||
Use this backend to take advantage of external-to-Django-handled
|
||
authentication. It authenticates using usernames passed in
|
||
:attr:`request.META['REMOTE_USER'] <django.http.HttpRequest.META>`. See
|
||
the :doc:`Authenticating against REMOTE_USER </howto/auth-remote-user>`
|
||
documentation.
|
||
|
||
If you need more control, you can create your own authentication backend
|
||
that inherits from this class and override these attributes or methods:
|
||
|
||
.. attribute:: RemoteUserBackend.create_unknown_user
|
||
|
||
``True`` or ``False``. Determines whether or not a
|
||
:class:`~django.contrib.auth.models.User` object is created if not already
|
||
in the database. Defaults to ``True``.
|
||
|
||
.. method:: RemoteUserBackend.authenticate(remote_user)
|
||
|
||
The username passed as ``remote_user`` is considered trusted. This method
|
||
simply returns the ``User`` object with the given username, creating a new
|
||
``User`` object if :attr:`~RemoteUserBackend.create_unknown_user` is
|
||
``True``.
|
||
|
||
Returns ``None`` if :attr:`~RemoteUserBackend.create_unknown_user` is
|
||
``False`` and a ``User`` object with the given username is not found in the
|
||
database.
|
||
|
||
.. method:: RemoteUserBackend.clean_username(username)
|
||
|
||
Performs any cleaning on the ``username`` (e.g. stripping LDAP DN
|
||
information) prior to using it to get or create a
|
||
:class:`~django.contrib.auth.models.User` object. Returns the cleaned
|
||
username.
|
||
|
||
.. method:: RemoteUserBackend.configure_user(user)
|
||
|
||
Configures a newly created user. This method is called immediately after a
|
||
new user is created, and can be used to perform custom setup actions, such
|
||
as setting the user's groups based on attributes in an LDAP directory.
|
||
Returns the user object.
|
||
|
||
.. method:: RemoteUserBackend.user_can_authenticate()
|
||
|
||
.. versionadded:: 1.10
|
||
|
||
Returns whether the user is allowed to authenticate. This method returns
|
||
``False`` for users with :attr:`is_active=False
|
||
<django.contrib.auth.models.User.is_active>`. Custom user models that don't
|
||
have an :attr:`~django.contrib.auth.models.CustomUser.is_active` field are
|
||
allowed.
|
||
|
||
.. class:: AllowAllUsersRemoteUserBackend
|
||
|
||
.. versionadded:: 1.10
|
||
|
||
Same as :class:`RemoteUserBackend` except that it doesn't reject inactive
|
||
users because :attr:`~RemoteUserBackend.user_can_authenticate` always
|
||
returns ``True``.
|