djangodocs

Django 3.1
Português (Brasil)
Documentation contents

django.contrib.auth

This document provides API reference material for the components of Django’s authentication system. For more details on the usage of these components or how to customize authentication and authorization see the authentication topic guide.

User model

class models.User

Campos

class models.User

User objects have the following fields:

username

Required. 150 characters or fewer. Usernames may contain alphanumeric, _, @, +, . and - characters.

The max_length should be sufficient for many use cases. If you need a longer length, please use a custom user model. If you use MySQL with the utf8mb4 encoding (recommended for proper Unicode support), specify at most max_length=191 because MySQL can only create unique indexes with 191 characters in that case by default.

first_name

Optional (blank=True). 150 characters or fewer.

last_name

Optional (blank=True). 150 characters or fewer.

email

Optional (blank=True). Email address.

password

Required. A hash of, and metadata about, the password. (Django doesn’t store the raw password.) Raw passwords can be arbitrarily long and can contain any character. See the password documentation.

groups

Many-to-many relationship to Group

user_permissions

Many-to-many relationship to Permission

is_staff

Boolean. Designates whether this user can access the admin site.

is_active

Boolean. Designates whether this user account should be considered active. We recommend that you set this flag to False instead of deleting accounts; that way, if your applications have any foreign keys to users, the foreign keys won’t break.

This doesn’t necessarily control whether or not the user can log in. Authentication backends aren’t required to check for the is_active flag but the default backend (ModelBackend) and the RemoteUserBackend do. You can use AllowAllUsersModelBackend or AllowAllUsersRemoteUserBackend if you want to allow inactive users to login. In this case, you’ll also want to customize the AuthenticationForm used by the LoginView as it rejects inactive users. Be aware that the permission-checking methods such as has_perm() and the authentication in the Django admin all return False for inactive users.

is_superuser

Booleano. Designa que este user tem todas as permissões sem explicitamente assinalá-los.

last_login

A datetime of the user’s last login.

date_joined

A datetime designating when the account was created. Is set to the current date/time by default when the account is created.

Atributos

class models.User
is_authenticated

Atributo somente de leitura que está sempre definido como True``(oposto ao `AnonymousUser.is_authenticated que é sempre False. Esta á a maneira de dizer se o usuário foi atenticado. Isso não implica em verificação de nenhuma permissão e não verifica se o usuário é ativo ou tem uma sessão válida. Mesmo que normalmente você irá verificar este atributo no request.user para descobrir se foi populado pelo AuthenticationMiddleware (representando o usuário logado atualmente), você deve saber se este atributo é True para qualquer instância de User.

is_anonymous

Read-only attribute which is always False. This is a way of differentiating User and AnonymousUser objects. Generally, you should prefer using is_authenticated to this attribute.

Métodos

class models.User
get_username()

Returns the username for the user. Since the User model can be swapped out, you should use this method instead of referencing the username attribute directly.

get_full_name()

Returns the first_name plus the last_name, with a space in between.

get_short_name()

Retorna o first_name.

set_password(raw_password)

Sets the user’s password to the given raw string, taking care of the password hashing. Doesn’t save the User object.

When the raw_password is None, the password will be set to an unusable password, as if set_unusable_password() were used.

check_password(raw_password)

Retorna ``True``se a string simples é a senha correta para o usuário. (leva em conta a criptografia da senha quando fizer a comparação.)

set_unusable_password()

Marks the user as having no password set. This isn’t the same as having a blank string for a password. check_password() for this user will never return True. Doesn’t save the User object.

Você talvez precise disso se a autenticação para sua aplicação é feita em uma fonte externa existente como um diretório LDAP.

has_usable_password()

Returns False if set_unusable_password() has been called for this user.

get_user_permissions(obj=None)

Returns a set of permission strings that the user has directly.

If obj is passed in, only returns the user permissions for this specific object.

get_group_permissions(obj=None)

Retorna um conjunto de strings de permissões que o usuário tem, além de seus grupos.

Se o obj passado, somente retorna o grupo de permissões para este objeto específico.

get_all_permissions(obj=None)

Retorna um conjunto de strings de permissões que o usuário tem, ambas permissões grupo e usuário.

Se o obj é passado, somente retorna as permissões para este objeto específico.

has_perm(perm, obj=None)

Returns True if the user has the specified permission, where perm is in the format "<app label>.<permission codename>". (see documentation on permissions). If the user is inactive, this method will always return False. For an active superuser, this method will always return True.

Se obj é passado, este método não irá verificar por permissões para o modelo, mas para este objeto específico.

has_perms(perm_list, obj=None)

Returns True if the user has each of the specified permissions, where each perm is in the format "<app label>.<permission codename>". If the user is inactive, this method will always return False. For an active superuser, this method will always return True.

Se obj é passado, este método não irá verificar por permissões para o modelo, mas para este objeto específico.

has_module_perms(package_name)

Returns True if the user has any permissions in the given package (the Django app label). If the user is inactive, this method will always return False. For an active superuser, this method will always return True.

email_user(subject, message, from_email=None, **kwargs)

Sends an email to the user. If from_email is None, Django uses the DEFAULT_FROM_EMAIL. Any **kwargs are passed to the underlying send_mail() call.

Manager methods

class models.UserManager

The User model has a custom manager that has the following helper methods (in addition to the methods provided by BaseUserManager):

create_user(username, email=None, password=None, **extra_fields)

Creates, saves and returns a User.

The username and password are set as given. The domain portion of email is automatically converted to lowercase, and the returned User object will have is_active set to True.

If no password is provided, set_unusable_password() will be called.

The extra_fields keyword arguments are passed through to the User’s __init__ method to allow setting arbitrary fields on a custom user model.

See Creating users for example usage.

create_superuser(username, email=None, password=None, **extra_fields)

Same as create_user(), but sets is_staff and is_superuser to True.

with_perm(perm, is_active=True, include_superusers=True, backend=None, obj=None)

Returns users that have the given permission perm either in the "<app label>.<permission codename>" format or as a Permission instance. Returns an empty queryset if no users who have the perm found.

If is_active is True (default), returns only active users, or if False, returns only inactive users. Use None to return all users irrespective of active state.

If include_superusers is True (default), the result will include superusers.

If backend is passed in and it’s defined in AUTHENTICATION_BACKENDS, then this method will use it. Otherwise, it will use the backend in AUTHENTICATION_BACKENDS, if there is only one, or raise an exception.

Objeto AnonymousUser

class models.AnonymousUser

django.contrib.auth.models.AnonymousUser is a class that implements the django.contrib.auth.models.User interface, with these differences:

In practice, you probably won’t need to use AnonymousUser objects on your own, but they’re used by Web requests, as explained in the next section.

Modelo Permission

class models.Permission

Campos

Permission objects have the following fields:

class models.Permission
name

Required. 255 characters or fewer. Example: 'Can vote'.

content_type

Required. A reference to the django_content_type database table, which contains a record for each installed model.

codename

Required. 100 characters or fewer. Example: 'can_vote'.

Métodos

Permission objects have the standard data-access methods like any other Django model.

Modelo``Group``

class models.Group

Campos

Group objects have the following fields:

class models.Group
name

Required. 150 characters or fewer. Any characters are permitted. Example: 'Awesome Users'.

permissions

Many-to-many field to Permission:

Code
group.permissions.set([permission_list])
group.permissions.add(permission, permission, ...)
group.permissions.remove(permission, permission, ...)
group.permissions.clear()

Validadores

class validators.ASCIIUsernameValidator

A field validator allowing only ASCII letters and numbers, in addition to @, ., +, -, and _.

class validators.UnicodeUsernameValidator

A field validator allowing Unicode characters, in addition to @, ., +, -, and _. The default validator for User.username.

Login and logout signals

The auth framework uses the following signals that can be used for notification when a user logs in or out.

user_logged_in()

Sent when a user logs in successfully.

Arguments sent with this signal:

sender

The class of the user that just logged in.

request

The current HttpRequest instance.

user

The user instance that just logged in.

user_logged_out()

Sent when the logout method is called.

sender

As above: the class of the user that just logged out or None if the user was not authenticated.

request

The current HttpRequest instance.

user

The user instance that just logged out or None if the user was not authenticated.

user_login_failed()

Sent when the user failed to login successfully

sender

The name of the module used for authentication.

credentials

A dictionary of keyword arguments containing the user credentials that were passed to authenticate() or your own custom authentication backend. Credentials matching a set of ‘sensitive’ patterns, (including password) will not be sent in the clear as part of the signal.

request

The HttpRequest object, if one was provided to authenticate().

Authentication backends

This section details the authentication backends that come with Django. For information on how to use them and how to write your own authentication backends, see the Other authentication sources section of the User authentication guide.

Available authentication backends

The following backends are available in django.contrib.auth.backends:

class BaseBackend

A base class that provides default implementations for all required methods. By default, it will reject any user and provide no permissions.

get_user_permissions(user_obj, obj=None)

Returns an empty set.

get_group_permissions(user_obj, obj=None)

Returns an empty set.

get_all_permissions(user_obj, obj=None)

Uses get_user_permissions() and get_group_permissions() to get the set of permission strings the user_obj has.

has_perm(user_obj, perm, obj=None)

Uses get_all_permissions() to check if user_obj has the permission string perm.

class ModelBackend

This is the default authentication backend used by Django. It authenticates using credentials consisting of a user identifier and password. For Django’s default user model, the user identifier is the username, for custom user models it is the field specified by USERNAME_FIELD (see Customizing Users and authentication).

It also handles the default permissions model as defined for User and PermissionsMixin.

has_perm(), get_all_permissions(), get_user_permissions(), and get_group_permissions() allow an object to be passed as a parameter for object-specific permissions, but this backend does not implement them other than returning an empty set of permissions if obj is not None.

with_perm() also allows an object to be passed as a parameter, but unlike others methods it returns an empty queryset if obj is not None.

authenticate(request, username=None, password=None, **kwargs)

Tries to authenticate username with password by calling User.check_password. If no username is provided, it tries to fetch a username from kwargs using the key CustomUser.USERNAME_FIELD. Returns an authenticated user or None.

O request é uma HttpRequest e pode ser None se não foi fornecido para o authenticate() (o qual o passa para o backend).

get_user_permissions(user_obj, obj=None)

Returns the set of permission strings the user_obj has from their own user permissions. Returns an empty set if is_anonymous or is_active is False.

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 is_anonymous or is_active is False.

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 is_anonymous or is_active is False.

has_perm(user_obj, perm, obj=None)

Uses get_all_permissions() to check if user_obj has the permission string perm. Returns False if the user is not is_active.

has_module_perms(user_obj, app_label)

Returns whether the user_obj has any permissions on the app app_label.

user_can_authenticate()

Returns whether the user is allowed to authenticate. To match the behavior of AuthenticationForm which prohibits inactive users from logging in, this method returns False for users with is_active=False. Custom user models that don’t have an is_active field are allowed.

with_perm(perm, is_active=True, include_superusers=True, obj=None)

Returns all active users who have the permission perm either in the form of "<app label>.<permission codename>" or a Permission instance. Returns an empty queryset if no users who have the perm found.

If is_active is True (default), returns only active users, or if False, returns only inactive users. Use None to return all users irrespective of active state.

If include_superusers is True (default), the result will include superusers.

class AllowAllUsersModelBackend

Same as ModelBackend except that it doesn’t reject inactive users because user_can_authenticate() always returns True.

When using this backend, you’ll likely want to customize the AuthenticationForm used by the LoginView by overriding the 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 request.META['REMOTE_USER']. See the Authenticating against 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:

create_unknown_user

True or False. Determines whether or not a user object is created if not already in the database Defaults to True.

authenticate(request, remote_user)

The username passed as remote_user is considered trusted. This method returns the user object with the given username, creating a new user object if create_unknown_user is True.

Returns None if create_unknown_user is False and a User object with the given username is not found in the database.

O request é uma HttpRequest e pode ser None se não foi fornecido para o authenticate() (o qual o passa para o backend).

clean_username(username)

Performs any cleaning on the username (e.g. stripping LDAP DN information) prior to using it to get or create a user object. Returns the cleaned username.

configure_user(request, 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.

O request é uma HttpRequest e pode ser None se não foi fornecido para o authenticate() (o qual o passa para o backend).

user_can_authenticate()

Returns whether the user is allowed to authenticate. This method returns False for users with is_active=False. Custom user models that don’t have an is_active field are allowed.

class AllowAllUsersRemoteUserBackend

Same as RemoteUserBackend except that it doesn’t reject inactive users because user_can_authenticate always returns True.

Utility functions

get_user(request)

Returns the user model instance associated with the given request’s session.

It checks if the authentication backend stored in the session is present in AUTHENTICATION_BACKENDS. If so, it uses the backend’s get_user() method to retrieve the user model instance and then verifies the session by calling the user model’s get_session_auth_hash() method.

Returns an instance of AnonymousUser if the authentication backend stored in the session is no longer in AUTHENTICATION_BACKENDS, if a user isn’t returned by the backend’s get_user() method, or if the session auth hash doesn’t validate.

This page as Markdown JSON

Edit this page on GitHub Official version