### Use cases: external service { #use-cases-external-service }

An example could be that you have an external authentication provider that you need to call.

You send it a token and it returns an authenticated user.

If you integrate your API with an OAuth2 provider, you will be able to authenticate and come back to the API docs with the acquired credentials. And interact with it using the real OAuth2 authentication.

Swagger UI will handle it behind the scenes for you, but it needs this "redirect" helper.

///

### Create a *path operation* to test it { #create-a-path-operation-to-test-it }

Use `Response.challenges()` to get the schemes and realms of any authentication challenges. When fulfilling a `Basic` challenge, use `Credentials.basic(username, password)` to encode the request header.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient.Builder()
          .authenticator(object : Authenticator {
            @Throws(IOException::class)

This is very useful when you need to:

* Have shared logic (the same code logic again and again).
* Share database connections.
* Enforce security, authentication, role requirements, etc.
* And many other things...

All these, while minimizing code repetition.

## First Steps { #first-steps }

 * is used to verify the signature of the "www.squareup.com" certificate.
 *
 * This roles are reversed for client authentication. In that case the client has a private key and
 * a chain of certificates. The server uses a set of trusted root certificates to authenticate the
 * client. Subject alternative names are not used for client authentication.
 */
@Suppress("DEPRECATION")
class HeldCertificate(
  @get:JvmName("keyPair") val keyPair: KeyPair,

	EnvKESClientKey      = "MINIO_KMS_KES_KEY_FILE"     // Path to TLS private key for authenticating to KES with mTLS - usually prefer API keys
	EnvKESClientCert     = "MINIO_KMS_KES_CERT_FILE"    // Path to TLS certificate for authenticating to KES with mTLS - usually prefer API keys

	if debugPrint {
		fmt.Printf("handler: Got Connect Req %+v\n", cReq)
	}
	writeErr(remote.handleIncoming(ctx, conn, cReq))
}

// AuthFn should provide an authentication string for the given aud.
type AuthFn func() string

// ValidateAuthFn should check authentication for the given aud.
type ValidateAuthFn func(auth string) string

// Connection will return the connection for the specified host.

			CipherSuites:             crypto.TLSCiphersBackwardCompatible(),
			CurvePreferences:         crypto.TLSCurveIDs(),
		}
		// This is only to support client side certificate authentication
		// https://coreos.com/etcd/docs/latest/op-guide/security.html
		etcdClientCertFile := env.Get(EnvEtcdClientCert, kvs.Get(ClientCert))
		etcdClientCertKey := env.Get(EnvEtcdClientCertKey, kvs.Get(ClientCertKey))

    * <a href="https://fastapi.tiangolo.com/features/" class="external-link" target="_blank">**Birçok diger özelliği**</a> dahili otomatik doğrulama, serialization, interaktif dokümantasyon, OAuth2 JWT token ile authentication, vb.
* **Güvenli şifreleme** .
* **JWT token** kimlik doğrulama.
* **SQLAlchemy** models (Flask dan bağımsızdır. Celery worker'ları ile kullanılabilir).

import org.apache.maven.settings.crypto.SettingsDecryptionResult;
import org.apache.maven.wagon.ResourceDoesNotExistException;
import org.apache.maven.wagon.TransferFailedException;
import org.apache.maven.wagon.authentication.AuthenticationInfo;
import org.apache.maven.wagon.proxy.ProxyInfo;
import org.codehaus.plexus.logging.Logger;

/**
 * Manages <a href="https://maven.apache.org/wagon">Wagon</a> related operations in Maven.
 */