return errors.New("format value unrecognized")
		}
	}
	if a.Index == "" {
		return errors.New("empty index value")
	}

	if (a.Username == "" && a.Password != "") || (a.Username != "" && a.Password == "") {
		return errors.New("username and password should be set in pairs")
	}

	return nil
}

// ElasticsearchTarget - Elasticsearch target.
type ElasticsearchTarget struct {

					<c:choose>
						<c:when test="${!empty username && username != 'guest'}">
							<li class="nav-item">
								<div class="dropdown">
									<a id="userMenu" class="nav-link dropdown-toggle" data-bs-toggle="dropdown"
										href="#" role="button" aria-haspopup="true"
										aria-expanded="false"> <i class="fa fa-fw fa-user" aria-hidden="true"></i>
										<span>${username}</span>
									</a>

        try {
            userService.store(entity);
            saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
        } catch (final Exception e) {
            logger.warn("Failed to create user: username={}, error={}", body.name, e.getMessage(), e);
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)));
        }

     *
     * @param form the form containing the web config data
     * @param username the username of the current user
     * @param currentTime the current timestamp
     * @return an optional WebConfig entity
     */
    public static OptionalEntity<WebConfig> getEntity(final CreateForm form, final String username, final long currentTime) {
        switch (form.crudMode) {
        case CrudMode.CREATE:

                                    <label for="username" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.webauth_username"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="username"/>
                                        <la:text styleId="username" property="username" styleClass="form-control"/>

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: Union[str, None] = None
    full_name: Union[str, None] = None
    disabled: Union[bool, None] = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )

Итак, рассмотрим это с упрощенной точки зрения:

* Пользователь вводит на фронтенде `username` и `password` и нажимает `Enter`.
* Фронтенд (работающий в браузере пользователя) отправляет эти `username` и `password` на конкретный URL в нашем API (объявленный с `tokenUrl="token"`).
* API проверяет этот `username` и `password` и отвечает «токеном» (мы еще ничего из этого не реализовали).

    * Isto contém o `username` e o `password` enviado.

{* ../../docs_src/security/tutorial006_an_py39.py hl[4,8,12] *}

Quando você tentar abrir a URL pela primeira vez (ou clicar no botão "Executar" na documentação) o navegador vai pedir pelo seu usuário e senha:

<img src="/img/tutorial/security/image12.png">

## Verifique o usuário { #check-the-username }

Aqui está um exemplo mais completo.

							<c:choose>
								<c:when test="${!empty username && username != 'guest'}">
									<li class="nav-item">
										<div class="dropdown">
											<a id="userMenu" class="nav-link dropdown-toggle" data-bs-toggle="dropdown"
												href="#" role="button" aria-haspopup="true"
												aria-expanded="false"> <i class="fa fa-fw fa-user" aria-hidden="true"></i>${username}
											</a>

// factory receiver.  This constructor will normalize the username, password
// and authzID via the SASLprep algorithm, as recommended by RFC-5802.  If
// SASLprep fails, the method returns an error.
func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error) {
	x.Client, err = x.NewClient(userName, password, authzID)
	if err != nil {
		return err
	}