Por ejemplo, en una de las formas en las que se puede usar la especificación OAuth2 (llamada "password flow") se requiere enviar un `username` y `password` como campos de formulario.

La <abbr title="specification">especificación</abbr> requiere que los campos se llamen exactamente `username` y `password`, y que se envíen como campos de formulario, no JSON.

{* ../../docs_src/request_forms/tutorial001_an_py39.py hl[9] *}

For example, in one of the ways the OAuth2 specification can be used (called "password flow") it is required to send a `username` and `password` as form fields.

The <abbr title="specification">spec</abbr> requires the fields to be exactly named `username` and `password`, and to be sent as form fields, not JSON.

    /**
     * The username of the user.
     */
    @Required
    @Size(max = 100)
    public String name;

    /**
     * The password for the user.
     */
    @Size(max = 100)
    public String password;

    /**
     * The password confirmation field.
     */
    @Size(max = 100)
    public String confirmPassword;

    /**
     * The attributes map for the user.
     */

        });

    }

    /**
     * Changes the password for a user identified by username.
     * Updates both the authentication manager and the database with the new encrypted password.
     *
     * @param username the username of the user
     * @param password the new password in plain text
     * @throws FessUserNotFoundException if the user is not found
     */

## Pegue o `username` (nome de usuário) e `password` (senha)

É utilizado o utils de segurança da **FastAPI** para obter o `username` e a `password`.

OAuth2 especifica que ao usar o "password flow" (fluxo de senha), que estamos usando, o cliente/usuário deve enviar os campos `username` e `password` como dados do formulário.

     * @param domain the domain for authentication
     * @param username the username for authentication
     * @param password the password for authentication
     */
    public JAASAuthenticator(String serviceName, String domain, String username, String password) {
        super(null, domain, username, password);
        this.serviceName = serviceName;
    }

    /**
     * Create an authenticator using the given credentials

    #   o user: The database user name. (Required)
    #   o password: The database password. (NotRequired - Default '')
    #
    #; schemaSyncCheckMap = map:{
    #    ; url = jdbc:...
    #    ; schema = EXAMPLEDB
    #    ; user = exampuser
    #    ; password = exampword
    #}
    # - - - - - - - - - -/

Para manejar eso, primero convertimos el `username` y `password` a `bytes` codificándolos con UTF-8.

Luego podemos usar `secrets.compare_digest()` para asegurar que `credentials.username` es `"stanleyjobson"`, y que `credentials.password` es `"swordfish"`.

{* ../../docs_src/security/tutorial007_an_py39.py hl[1,12:24] *}

Esto sería similar a:

```Python

    public void setPassword_Terms(ConditionOptionCall<TermsAggregationBuilder> opLambda) {
        setPassword_Terms("password", opLambda, null);
    }

    public void setPassword_Terms(ConditionOptionCall<TermsAggregationBuilder> opLambda, OperatorCall<BsWebAuthenticationCA> aggsLambda) {
        setPassword_Terms("password", opLambda, aggsLambda);
    }

    if (args.length != 4) {
      System.out.println("Usage: SampleServer <keystore> <password> <root file> <port>");
      return;
    }

    String keystoreFile = args[0];
    String password = args[1];
    String root = args[2];
    int port = Integer.parseInt(args[3]);

    SSLContext sslContext = sslContext(keystoreFile, password);
    SampleServer server = new SampleServer(sslContext, root, port);
    server.run();