[[oauth2Client-additional-features]]
= Authorized Client Features

[[oauth2Client-registered-authorized-client]]
== Resolving an Authorized Client

The `@RegisteredOAuth2AuthorizedClient` annotation provides the capability of resolving a method parameter to an argument value of type `OAuth2AuthorizedClient`.
This is a convenient alternative compared to accessing the `OAuth2AuthorizedClient` using the `OAuth2AuthorizedClientManager` or `OAuth2AuthorizedClientService`.

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Controller
public class OAuth2ClientController {

	@GetMapping("/")
	public String index(@RegisteredOAuth2AuthorizedClient("okta") OAuth2AuthorizedClient authorizedClient) {
		OAuth2AccessToken accessToken = authorizedClient.getAccessToken();

		...

		return "index";
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Controller
class OAuth2ClientController {
    @GetMapping("/")
    fun index(@RegisteredOAuth2AuthorizedClient("okta") authorizedClient: OAuth2AuthorizedClient): String {
        val accessToken = authorizedClient.accessToken

        ...

        return "index"
    }
}
----
======

The `@RegisteredOAuth2AuthorizedClient` annotation is handled by `OAuth2AuthorizedClientArgumentResolver`, which directly uses an xref:servlet/oauth2/client/core.adoc#oauth2Client-authorized-manager-provider[`OAuth2AuthorizedClientManager`] and therefore inherits it's capabilities.


[[oauth2Client-webclient-servlet]]
== WebClient integration for Servlet Environments

The OAuth 2.0 Client support integrates with `WebClient` using an `ExchangeFilterFunction`.

The `ServletOAuth2AuthorizedClientExchangeFilterFunction` provides a simple mechanism for requesting protected resources by using an `OAuth2AuthorizedClient` and including the associated `OAuth2AccessToken` as a Bearer Token.
It directly uses an xref:servlet/oauth2/client/core.adoc#oauth2Client-authorized-manager-provider[`OAuth2AuthorizedClientManager`] and therefore inherits the following capabilities:

* An `OAuth2AccessToken` will be requested if the client has not yet been authorized.
** `authorization_code` - triggers the Authorization Request redirect to initiate the flow
** `client_credentials` - the access token is obtained directly from the Token Endpoint
** `password` - the access token is obtained directly from the Token Endpoint
* If the `OAuth2AccessToken` is expired, it will be refreshed (or renewed) if an `OAuth2AuthorizedClientProvider` is available to perform the authorization

The following code shows an example of how to configure `WebClient` with OAuth 2.0 Client support:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Bean
WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
	ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client =
			new ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
	return WebClient.builder()
			.apply(oauth2Client.oauth2Configuration())
			.build();
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Bean
fun webClient(authorizedClientManager: OAuth2AuthorizedClientManager?): WebClient {
    val oauth2Client = ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager)
    return WebClient.builder()
            .apply(oauth2Client.oauth2Configuration())
            .build()
}
----
======

=== Providing the Authorized Client

The `ServletOAuth2AuthorizedClientExchangeFilterFunction` determines the client to use (for a request) by resolving the `OAuth2AuthorizedClient` from the `ClientRequest.attributes()` (request attributes).

The following code shows how to set an `OAuth2AuthorizedClient` as a request attribute:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@GetMapping("/")
public String index(@RegisteredOAuth2AuthorizedClient("okta") OAuth2AuthorizedClient authorizedClient) {
	String resourceUri = ...

	String body = webClient
			.get()
			.uri(resourceUri)
			.attributes(oauth2AuthorizedClient(authorizedClient))   <1>
			.retrieve()
			.bodyToMono(String.class)
			.block();

	...

	return "index";
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@GetMapping("/")
fun index(@RegisteredOAuth2AuthorizedClient("okta") authorizedClient: OAuth2AuthorizedClient): String {
    val resourceUri: String = ...
    val body: String = webClient
            .get()
            .uri(resourceUri)
            .attributes(oauth2AuthorizedClient(authorizedClient)) <1>
            .retrieve()
            .bodyToMono()
            .block()

    ...

    return "index"
}
----
======

<1> `oauth2AuthorizedClient()` is a `static` method in `ServletOAuth2AuthorizedClientExchangeFilterFunction`.

The following code shows how to set the `ClientRegistration.getRegistrationId()` as a request attribute:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@GetMapping("/")
public String index() {
	String resourceUri = ...

	String body = webClient
			.get()
			.uri(resourceUri)
			.attributes(clientRegistrationId("okta"))   <1>
			.retrieve()
			.bodyToMono(String.class)
			.block();

	...

	return "index";
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@GetMapping("/")
fun index(): String {
    val resourceUri: String = ...

    val body: String = webClient
            .get()
            .uri(resourceUri)
            .attributes(clientRegistrationId("okta"))  <1>
            .retrieve()
            .bodyToMono()
            .block()

    ...

    return "index"
}
----
======
<1> `clientRegistrationId()` is a `static` method in `ServletOAuth2AuthorizedClientExchangeFilterFunction`.


=== Defaulting the Authorized Client

If neither `OAuth2AuthorizedClient` or `ClientRegistration.getRegistrationId()` is provided as a request attribute, the `ServletOAuth2AuthorizedClientExchangeFilterFunction` can determine the _default_ client to use depending on it's configuration.

If `setDefaultOAuth2AuthorizedClient(true)` is configured and the user has authenticated using `HttpSecurity.oauth2Login()`, the `OAuth2AccessToken` associated with the current `OAuth2AuthenticationToken` is used.

The following code shows the specific configuration:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Bean
WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
	ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client =
			new ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
	oauth2Client.setDefaultOAuth2AuthorizedClient(true);
	return WebClient.builder()
			.apply(oauth2Client.oauth2Configuration())
			.build();
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Bean
fun webClient(authorizedClientManager: OAuth2AuthorizedClientManager?): WebClient {
    val oauth2Client = ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager)
    oauth2Client.setDefaultOAuth2AuthorizedClient(true)
    return WebClient.builder()
            .apply(oauth2Client.oauth2Configuration())
            .build()
}
----
======

[WARNING]
It is recommended to be cautious with this feature since all HTTP requests will receive the access token.

Alternatively, if `setDefaultClientRegistrationId("okta")` is configured with a valid `ClientRegistration`, the `OAuth2AccessToken` associated with the `OAuth2AuthorizedClient` is used.

The following code shows the specific configuration:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Bean
WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
	ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client =
			new ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
	oauth2Client.setDefaultClientRegistrationId("okta");
	return WebClient.builder()
			.apply(oauth2Client.oauth2Configuration())
			.build();
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Bean
fun webClient(authorizedClientManager: OAuth2AuthorizedClientManager?): WebClient {
    val oauth2Client = ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager)
    oauth2Client.setDefaultClientRegistrationId("okta")
    return WebClient.builder()
            .apply(oauth2Client.oauth2Configuration())
            .build()
}
----
======

[WARNING]
It is recommended to be cautious with this feature since all HTTP requests will receive the access token.
