Authorized Client Features

This section covers additional features provided by Spring Security for the OAuth2 client.

Resolving an Authorized Client

The @RegisteredOAuth2AuthorizedClient annotation provides the ability to resolve a method parameter to an argument value of type OAuth2AuthorizedClient. This is a convenient alternative compared to accessing the OAuth2AuthorizedClient by using the OAuth2AuthorizedClientManager or OAuth2AuthorizedClientService. The following example shows how to use @RegisteredOAuth2AuthorizedClient:

Java
Kotlin

@Controller
public class OAuth2ClientController {

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

		...

		return "index";
	}
}

@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 OAuth2AuthorizedClientManager and, therefore, inherits its capabilities.

WebClient Integration for Servlet Environments

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

The ServletOAuth2AuthorizedClientExchangeFilterFunction provides a mechanism for requesting protected resources by using an OAuth2AuthorizedClient and including the associated OAuth2AccessToken as a Bearer Token. It directly uses an OAuth2AuthorizedClientManager and, therefore, inherits the following capabilities:

An OAuth2AccessToken is 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 is 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:

Java
Kotlin

@Bean
WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
	ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client =
			new ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
	return WebClient.builder()
			.apply(oauth2Client.oauth2Configuration())
			.build();
}

@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:

Java
Kotlin

@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";
}

@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:

Java
Kotlin

@GetMapping("/")
public String index() {
	String resourceUri = ...

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

	...

	return "index";
}

@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`.

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

Java
Kotlin

@GetMapping("/")
public String index() {
	String resourceUri = ...

	Authentication anonymousAuthentication = new AnonymousAuthenticationToken(
			"anonymous", "anonymousUser", AuthorityUtils.createAuthorityList("ROLE_ANONYMOUS"));
	String body = webClient
			.get()
			.uri(resourceUri)
			.attributes(authentication(anonymousAuthentication))   (1)
			.retrieve()
			.bodyToMono(String.class)
			.block();

	...

	return "index";
}

@GetMapping("/")
fun index(): String {
    val resourceUri: String = ...

    val anonymousAuthentication: Authentication = AnonymousAuthenticationToken(
            "anonymous", "anonymousUser", AuthorityUtils.createAuthorityList("ROLE_ANONYMOUS"))
    val body: String = webClient
            .get()
            .uri(resourceUri)
            .attributes(authentication(anonymousAuthentication))  (1)
            .retrieve()
            .bodyToMono()
            .block()

    ...

    return "index"
}

1	`authentication()` is a `static` method in `ServletOAuth2AuthorizedClientExchangeFilterFunction`.

It is recommended to be cautious with this feature since all HTTP requests will receive an access token bound to the provided principal.

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 its configuration.

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

The following code shows the specific configuration:

Java
Kotlin

@Bean
WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
	ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client =
			new ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
	oauth2Client.setDefaultOAuth2AuthorizedClient(true);
	return WebClient.builder()
			.apply(oauth2Client.oauth2Configuration())
			.build();
}

@Bean
fun webClient(authorizedClientManager: OAuth2AuthorizedClientManager?): WebClient {
    val oauth2Client = ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager)
    oauth2Client.setDefaultOAuth2AuthorizedClient(true)
    return WebClient.builder()
            .apply(oauth2Client.oauth2Configuration())
            .build()
}

Be cautious with this feature, since all HTTP requests 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:

Java
Kotlin

@Bean
WebClient webClient(OAuth2AuthorizedClientManager authorizedClientManager) {
	ServletOAuth2AuthorizedClientExchangeFilterFunction oauth2Client =
			new ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
	oauth2Client.setDefaultClientRegistrationId("okta");
	return WebClient.builder()
			.apply(oauth2Client.oauth2Configuration())
			.build();
}

@Bean
fun webClient(authorizedClientManager: OAuth2AuthorizedClientManager?): WebClient {
    val oauth2Client = ServletOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager)
    oauth2Client.setDefaultClientRegistrationId("okta")
    return WebClient.builder()
            .apply(oauth2Client.oauth2Configuration())
            .build()
}

Be cautious with this feature, since all HTTP requests receive the access token.