{* ../../docs_src/security/tutorial003_an_py310.py hl[58:66,69:74,94] *}

/// info

L'en‑tête supplémentaire `WWW-Authenticate` avec la valeur `Bearer` que nous renvoyons ici fait également partie de la spécification.

Il est prévu qu'un code d'état HTTP (d'erreur) 401 « UNAUTHORIZED » renvoie également un en‑tête `WWW-Authenticate`.

Dans le cas des jetons bearer (notre cas), la valeur de cet en‑tête doit être `Bearer`.

{* ../../docs_src/security/tutorial003_an_py310.py hl[58:66,69:74,94] *}

/// info | Informação

O cabeçalho adicional `WWW-Authenticate` com valor `Bearer` que estamos retornando aqui também faz parte da especificação.

Qualquer código de status HTTP (erro) 401 "UNAUTHORIZED" também deve retornar um cabeçalho `WWW-Authenticate`.

No caso de tokens ao portador (nosso caso), o valor desse cabeçalho deve ser `Bearer`.

 */
class JavaNetAuthenticator(
  private val defaultDns: Dns = Dns.SYSTEM,
) : okhttp3.Authenticator {
  @Throws(IOException::class)
  override fun authenticate(
    route: Route?,
    response: Response,
  ): Request? {
    val challenges = response.challenges()
    val request = response.request
    val url = request.url
    val proxyAuthorization = response.code == 407

    'sts',
    region_name='us-east-1',
    use_ssl=False,
    endpoint_url='http://localhost:9000',
)

app = Flask(__name__)


@app.route('/')
def homepage():
    text = '<a href="%s">Authenticate with keycloak</a>'
    return text % make_authorization_url()


def make_authorization_url():
    # Generate a random string for the state parameter
    # Save it for use later to prevent xsrf attacks

          throw ProtocolException("Received HTTP_PROXY_AUTH (407) code while not using proxy")
        }
        return chain.proxyAuthenticator.authenticate(route, userResponse)
      }

      HTTP_UNAUTHORIZED -> {
        return chain.authenticator.authenticate(route, userResponse)
      }

      HTTP_PERM_REDIRECT, HTTP_TEMP_REDIRECT, HTTP_MULT_CHOICE, HTTP_MOVED_PERM, HTTP_MOVED_TEMP, HTTP_SEE_OTHER -> {

したがって、エンドポイントでは、ユーザーが存在し、正しく認証され、かつアクティブである場合にのみ、ユーザーを取得します:

{* ../../docs_src/security/tutorial003_an_py310.py hl[58:66,69:74,94] *}

/// info | 情報

ここで返している値が `Bearer` の追加ヘッダー `WWW-Authenticate` も仕様の一部です。

HTTP（エラー）ステータスコード 401「UNAUTHORIZED」は、`WWW-Authenticate` ヘッダーも返すことになっています。

ベアラートークン（今回のケース）の場合、そのヘッダーの値は `Bearer` であるべきです。

実際のところ、この追加ヘッダーを省略しても動作はします。

しかし、仕様に準拠するためにここでは付与しています。

     * @param challenge the server challenge (may be null for some auth types)
     * @return authentication response data
     * @throws CIFSException if authentication fails
     */
    byte[] authenticate(CIFSContext context, byte[] challenge) throws CIFSException;

    /**
     * Gets the session key after successful authentication
     *
     * @return the session key or null if not available
     */

Let's imagine that you have your **backend** API in some domain.

And you have a **frontend** in another domain or in a different path of the same domain (or in a mobile application).

And you want to have a way for the frontend to authenticate with the backend, using a **username** and **password**.

We can use **OAuth2** to build that with **FastAPI**.

          <description>
            The username used to authenticate.
          </description>
          <type>String</type>
        </field>
        <field>
          <name>password</name>
          <version>1.0.0+</version>
          <description>
            The password used in conjunction with the username to authenticate.
          </description>
          <type>String</type>
        </field>

		fmt.Println("AccessKeyID:", v.AccessKeyID)
		fmt.Println("SecretAccessKey:", v.SecretAccessKey)
		fmt.Println("SessionToken:", v.SessionToken)
		return
	}

	// Use generated credentials to authenticate with MinIO server
	stsEndpointURL, err := url.Parse(stsEndpoint)
	if err != nil {
		log.Fatalf("Error parsing sts endpoint: %v", err)
	}
	copts := &minio.Options{
		Creds:  li,