OAuth 2.0 Client

The OAuth 2.0 Client features provide support for the Client role as defined in the OAuth 2.0 Authorization Framework.

At a high-level, the core features available are:

Authorization Grant support

Client Authentication support

JWT Bearer

HTTP Client support

WebClient integration for Servlet Environments (for requesting protected resources)

The HttpSecurity.oauth2Client() DSL provides a number of configuration options for customizing the core components used by OAuth 2.0 Client. In addition, HttpSecurity.oauth2Client().authorizationCodeGrant() enables the customization of the Authorization Code grant.

The following code shows the complete configuration options provided by the HttpSecurity.oauth2Client() DSL:

Example 1. OAuth2 Client Configuration Options

Java

@EnableWebSecurity
public class OAuth2ClientSecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.oauth2Client(oauth2 -> oauth2
				.clientRegistrationRepository(this.clientRegistrationRepository())
				.authorizedClientRepository(this.authorizedClientRepository())
				.authorizedClientService(this.authorizedClientService())
				.authorizationCodeGrant(codeGrant -> codeGrant
					.authorizationRequestRepository(this.authorizationRequestRepository())
					.authorizationRequestResolver(this.authorizationRequestResolver())
					.accessTokenResponseClient(this.accessTokenResponseClient())
				)
			);
	}
}

Kotlin

@EnableWebSecurity
class OAuth2ClientSecurityConfig : WebSecurityConfigurerAdapter() {

    override fun configure(http: HttpSecurity) {
        http {
            oauth2Client {
                clientRegistrationRepository = clientRegistrationRepository()
                authorizedClientRepository = authorizedClientRepository()
                authorizedClientService = authorizedClientService()
                authorizationCodeGrant {
                    authorizationRequestRepository = authorizationRequestRepository()
                    authorizationRequestResolver = authorizationRequestResolver()
                    accessTokenResponseClient = accessTokenResponseClient()
                }
            }
        }
    }
}

In addition to the HttpSecurity.oauth2Client() DSL, XML configuration is also supported.

The following code shows the complete configuration options available in the security namespace:

Example 2. OAuth2 Client XML Configuration Options

<http>
	<oauth2-client client-registration-repository-ref="clientRegistrationRepository"
				   authorized-client-repository-ref="authorizedClientRepository"
				   authorized-client-service-ref="authorizedClientService">
		<authorization-code-grant
				authorization-request-repository-ref="authorizationRequestRepository"
				authorization-request-resolver-ref="authorizationRequestResolver"
				access-token-response-client-ref="accessTokenResponseClient"/>
	</oauth2-client>
</http>

The OAuth2AuthorizedClientManager is responsible for managing the authorization (or re-authorization) of an OAuth 2.0 Client, in collaboration with one or more OAuth2AuthorizedClientProvider(s).

The following code shows an example of how to register an OAuth2AuthorizedClientManager @Bean and associate it with an OAuth2AuthorizedClientProvider composite that provides support for the authorization_code, refresh_token, client_credentials and password authorization grant types:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientRepository authorizedClientRepository) {

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.authorizationCode()
					.refreshToken()
					.clientCredentials()
					.password()
					.build();

	DefaultOAuth2AuthorizedClientManager authorizedClientManager =
			new DefaultOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientRepository);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	return authorizedClientManager;
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientRepository: OAuth2AuthorizedClientRepository): OAuth2AuthorizedClientManager {
    val authorizedClientProvider: OAuth2AuthorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .authorizationCode()
            .refreshToken()
            .clientCredentials()
            .password()
            .build()
    val authorizedClientManager = DefaultOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientRepository)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)
    return authorizedClientManager
}

The following sections will go into more detail on the core components used by OAuth 2.0 Client and the configuration options available:

Core Interfaces / Classes
Authorization Grant Support
Client Authentication Support
- JWT Bearer
Additional Features
- Resolving an Authorized Client
WebClient integration for Servlet Environments

Core Interfaces / Classes

ClientRegistration

ClientRegistration is a representation of a client registered with an OAuth 2.0 or OpenID Connect 1.0 Provider.

A client registration holds information, such as client id, client secret, authorization grant type, redirect URI, scope(s), authorization URI, token URI, and other details.

ClientRegistration and its properties are defined as follows:

public final class ClientRegistration {
	private String registrationId;	(1)
	private String clientId;	(2)
	private String clientSecret;	(3)
	private ClientAuthenticationMethod clientAuthenticationMethod;	(4)
	private AuthorizationGrantType authorizationGrantType;	(5)
	private String redirectUri;	(6)
	private Set<String> scopes;	(7)
	private ProviderDetails providerDetails;
	private String clientName;	(8)

	public class ProviderDetails {
		private String authorizationUri;	(9)
		private String tokenUri;	(10)
		private UserInfoEndpoint userInfoEndpoint;
		private String jwkSetUri;	(11)
		private String issuerUri;	(12)
        private Map<String, Object> configurationMetadata;  (13)

		public class UserInfoEndpoint {
			private String uri;	(14)
            private AuthenticationMethod authenticationMethod;  (15)
			private String userNameAttributeName;	(16)

		}
	}
}

1	`registrationId`: The ID that uniquely identifies the `ClientRegistration`.
2	`clientId`: The client identifier.
3	`clientSecret`: The client secret.
4	`clientAuthenticationMethod`: The method used to authenticate the Client with the Provider. The supported values are client_secret_basic, client_secret_post, private_key_jwt, client_secret_jwt and none (public clients).
5	`authorizationGrantType`: The OAuth 2.0 Authorization Framework defines four Authorization Grant types. The supported values are `authorization_code`, `client_credentials`, `password`, as well as, extension grant type `urn:ietf:params:oauth:grant-type:jwt-bearer`.
6	`redirectUri`: The client’s registered redirect URI that the Authorization Server redirects the end-user’s user-agent to after the end-user has authenticated and authorized access to the client.
7	`scopes`: The scope(s) requested by the client during the Authorization Request flow, such as openid, email, or profile.
8	`clientName`: A descriptive name used for the client. The name may be used in certain scenarios, such as when displaying the name of the client in the auto-generated login page.
9	`authorizationUri`: The Authorization Endpoint URI for the Authorization Server.
10	`tokenUri`: The Token Endpoint URI for the Authorization Server.
11	`jwkSetUri`: The URI used to retrieve the JSON Web Key (JWK) Set from the Authorization Server, which contains the cryptographic key(s) used to verify the JSON Web Signature (JWS) of the ID Token and optionally the UserInfo Response.
12	`issuerUri`: Returns the issuer identifier uri for the OpenID Connect 1.0 provider or the OAuth 2.0 Authorization Server.
13	`configurationMetadata`: The OpenID Provider Configuration Information. This information will only be available if the Spring Boot 2.x property `spring.security.oauth2.client.provider.[providerId].issuerUri` is configured.
14	`(userInfoEndpoint)uri`: The UserInfo Endpoint URI used to access the claims/attributes of the authenticated end-user.
15	`(userInfoEndpoint)authenticationMethod`: The authentication method used when sending the access token to the UserInfo Endpoint. The supported values are header, form and query.
16	`userNameAttributeName`: The name of the attribute returned in the UserInfo Response that references the Name or Identifier of the end-user.

A ClientRegistration can be initially configured using discovery of an OpenID Connect Provider’s Configuration endpoint or an Authorization Server’s Metadata endpoint.

ClientRegistrations provides convenience methods for configuring a ClientRegistration in this way, as can be seen in the following example:

Java

ClientRegistration clientRegistration =
    ClientRegistrations.fromIssuerLocation("https://idp.example.com/issuer").build();

Kotlin

val clientRegistration = ClientRegistrations.fromIssuerLocation("https://idp.example.com/issuer").build()

The above code will query in series https://idp.example.com/issuer/.well-known/openid-configuration, and then https://idp.example.com/.well-known/openid-configuration/issuer, and finally https://idp.example.com/.well-known/oauth-authorization-server/issuer, stopping at the first to return a 200 response.

As an alternative, you can use ClientRegistrations.fromOidcIssuerLocation() to only query the OpenID Connect Provider’s Configuration endpoint.

ClientRegistrationRepository

The ClientRegistrationRepository serves as a repository for OAuth 2.0 / OpenID Connect 1.0 ClientRegistration(s).

Client registration information is ultimately stored and owned by the associated Authorization Server. This repository provides the ability to retrieve a sub-set of the primary client registration information, which is stored with the Authorization Server.

Spring Boot 2.x auto-configuration binds each of the properties under spring.security.oauth2.client.registration.[registrationId] to an instance of ClientRegistration and then composes each of the ClientRegistration instance(s) within a ClientRegistrationRepository.

The default implementation of ClientRegistrationRepository is InMemoryClientRegistrationRepository.

The auto-configuration also registers the ClientRegistrationRepository as a @Bean in the ApplicationContext so that it is available for dependency-injection, if needed by the application.

The following listing shows an example:

Java

@Controller
public class OAuth2ClientController {

	@Autowired
	private ClientRegistrationRepository clientRegistrationRepository;

	@GetMapping("/")
	public String index() {
		ClientRegistration oktaRegistration =
			this.clientRegistrationRepository.findByRegistrationId("okta");

		...

		return "index";
	}
}

Kotlin

@Controller
class OAuth2ClientController {

    @Autowired
    private lateinit var clientRegistrationRepository: ClientRegistrationRepository

    @GetMapping("/")
    fun index(): String {
        val oktaRegistration =
                this.clientRegistrationRepository.findByRegistrationId("okta")

        //...

        return "index";
    }
}

OAuth2AuthorizedClient

OAuth2AuthorizedClient is a representation of an Authorized Client. A client is considered to be authorized when the end-user (Resource Owner) has granted authorization to the client to access its protected resources.

OAuth2AuthorizedClient serves the purpose of associating an OAuth2AccessToken (and optional OAuth2RefreshToken) to a ClientRegistration (client) and resource owner, who is the Principal end-user that granted the authorization.

OAuth2AuthorizedClientRepository / OAuth2AuthorizedClientService

OAuth2AuthorizedClientRepository is responsible for persisting OAuth2AuthorizedClient(s) between web requests. Whereas, the primary role of OAuth2AuthorizedClientService is to manage OAuth2AuthorizedClient(s) at the application-level.

From a developer perspective, the OAuth2AuthorizedClientRepository or OAuth2AuthorizedClientService provides the capability to lookup an OAuth2AccessToken associated with a client so that it may be used to initiate a protected resource request.

The following listing shows an example:

Java

@Controller
public class OAuth2ClientController {

    @Autowired
    private OAuth2AuthorizedClientService authorizedClientService;

    @GetMapping("/")
    public String index(Authentication authentication) {
        OAuth2AuthorizedClient authorizedClient =
            this.authorizedClientService.loadAuthorizedClient("okta", authentication.getName());

        OAuth2AccessToken accessToken = authorizedClient.getAccessToken();

        ...

        return "index";
    }
}

Kotlin

@Controller
class OAuth2ClientController {

    @Autowired
    private lateinit var authorizedClientService: OAuth2AuthorizedClientService

    @GetMapping("/")
    fun index(authentication: Authentication): String {
        val authorizedClient: OAuth2AuthorizedClient =
            this.authorizedClientService.loadAuthorizedClient("okta", authentication.getName());
        val accessToken = authorizedClient.accessToken

        ...

        return "index";
    }
}

Spring Boot 2.x auto-configuration registers an OAuth2AuthorizedClientRepository and/or OAuth2AuthorizedClientService @Bean in the ApplicationContext. However, the application may choose to override and register a custom OAuth2AuthorizedClientRepository or OAuth2AuthorizedClientService @Bean.

The default implementation of OAuth2AuthorizedClientService is InMemoryOAuth2AuthorizedClientService, which stores OAuth2AuthorizedClient(s) in-memory.

Alternatively, the JDBC implementation JdbcOAuth2AuthorizedClientService may be configured for persisting OAuth2AuthorizedClient(s) in a database.

JdbcOAuth2AuthorizedClientService depends on the table definition described in OAuth 2.0 Client Schema.

OAuth2AuthorizedClientManager / OAuth2AuthorizedClientProvider

The OAuth2AuthorizedClientManager is responsible for the overall management of OAuth2AuthorizedClient(s).

The primary responsibilities include:

Authorizing (or re-authorizing) an OAuth 2.0 Client, using an OAuth2AuthorizedClientProvider.
Delegating the persistence of an OAuth2AuthorizedClient, typically using an OAuth2AuthorizedClientService or OAuth2AuthorizedClientRepository.
Delegating to an OAuth2AuthorizationSuccessHandler when an OAuth 2.0 Client has been successfully authorized (or re-authorized).
Delegating to an OAuth2AuthorizationFailureHandler when an OAuth 2.0 Client fails to authorize (or re-authorize).

An OAuth2AuthorizedClientProvider implements a strategy for authorizing (or re-authorizing) an OAuth 2.0 Client. Implementations will typically implement an authorization grant type, eg. authorization_code, client_credentials, etc.

The default implementation of OAuth2AuthorizedClientManager is DefaultOAuth2AuthorizedClientManager, which is associated with an OAuth2AuthorizedClientProvider that may support multiple authorization grant types using a delegation-based composite. The OAuth2AuthorizedClientProviderBuilder may be used to configure and build the delegation-based composite.

The following code shows an example of how to configure and build an OAuth2AuthorizedClientProvider composite that provides support for the authorization_code, refresh_token, client_credentials and password authorization grant types:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientRepository authorizedClientRepository) {

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.authorizationCode()
					.refreshToken()
					.clientCredentials()
					.password()
					.build();

	DefaultOAuth2AuthorizedClientManager authorizedClientManager =
			new DefaultOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientRepository);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	return authorizedClientManager;
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientRepository: OAuth2AuthorizedClientRepository): OAuth2AuthorizedClientManager {
    val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .authorizationCode()
            .refreshToken()
            .clientCredentials()
            .password()
            .build()
    val authorizedClientManager = DefaultOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientRepository)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)
    return authorizedClientManager
}

When an authorization attempt succeeds, the DefaultOAuth2AuthorizedClientManager will delegate to the OAuth2AuthorizationSuccessHandler, which (by default) will save the OAuth2AuthorizedClient via the OAuth2AuthorizedClientRepository. In the case of a re-authorization failure, eg. a refresh token is no longer valid, the previously saved OAuth2AuthorizedClient will be removed from the OAuth2AuthorizedClientRepository via the RemoveAuthorizedClientOAuth2AuthorizationFailureHandler. The default behaviour may be customized via setAuthorizationSuccessHandler(OAuth2AuthorizationSuccessHandler) and setAuthorizationFailureHandler(OAuth2AuthorizationFailureHandler).

The DefaultOAuth2AuthorizedClientManager is also associated with a contextAttributesMapper of type Function<OAuth2AuthorizeRequest, Map<String, Object>>, which is responsible for mapping attribute(s) from the OAuth2AuthorizeRequest to a Map of attributes to be associated to the OAuth2AuthorizationContext. This can be useful when you need to supply an OAuth2AuthorizedClientProvider with required (supported) attribute(s), eg. the PasswordOAuth2AuthorizedClientProvider requires the resource owner’s username and password to be available in OAuth2AuthorizationContext.getAttributes().

The following code shows an example of the contextAttributesMapper:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientRepository authorizedClientRepository) {

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.password()
					.refreshToken()
					.build();

	DefaultOAuth2AuthorizedClientManager authorizedClientManager =
			new DefaultOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientRepository);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	// Assuming the `username` and `password` are supplied as `HttpServletRequest` parameters,
	// map the `HttpServletRequest` parameters to `OAuth2AuthorizationContext.getAttributes()`
	authorizedClientManager.setContextAttributesMapper(contextAttributesMapper());

	return authorizedClientManager;
}

private Function<OAuth2AuthorizeRequest, Map<String, Object>> contextAttributesMapper() {
	return authorizeRequest -> {
		Map<String, Object> contextAttributes = Collections.emptyMap();
		HttpServletRequest servletRequest = authorizeRequest.getAttribute(HttpServletRequest.class.getName());
		String username = servletRequest.getParameter(OAuth2ParameterNames.USERNAME);
		String password = servletRequest.getParameter(OAuth2ParameterNames.PASSWORD);
		if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
			contextAttributes = new HashMap<>();

			// `PasswordOAuth2AuthorizedClientProvider` requires both attributes
			contextAttributes.put(OAuth2AuthorizationContext.USERNAME_ATTRIBUTE_NAME, username);
			contextAttributes.put(OAuth2AuthorizationContext.PASSWORD_ATTRIBUTE_NAME, password);
		}
		return contextAttributes;
	};
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientRepository: OAuth2AuthorizedClientRepository): OAuth2AuthorizedClientManager {
    val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .password()
            .refreshToken()
            .build()
    val authorizedClientManager = DefaultOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientRepository)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)

    // Assuming the `username` and `password` are supplied as `HttpServletRequest` parameters,
    // map the `HttpServletRequest` parameters to `OAuth2AuthorizationContext.getAttributes()`
    authorizedClientManager.setContextAttributesMapper(contextAttributesMapper())
    return authorizedClientManager
}

private fun contextAttributesMapper(): Function<OAuth2AuthorizeRequest, MutableMap<String, Any>> {
    return Function { authorizeRequest ->
        var contextAttributes: MutableMap<String, Any> = mutableMapOf()
        val servletRequest: HttpServletRequest = authorizeRequest.getAttribute(HttpServletRequest::class.java.name)
        val username: String = servletRequest.getParameter(OAuth2ParameterNames.USERNAME)
        val password: String = servletRequest.getParameter(OAuth2ParameterNames.PASSWORD)
        if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
            contextAttributes = hashMapOf()

            // `PasswordOAuth2AuthorizedClientProvider` requires both attributes
            contextAttributes[OAuth2AuthorizationContext.USERNAME_ATTRIBUTE_NAME] = username
            contextAttributes[OAuth2AuthorizationContext.PASSWORD_ATTRIBUTE_NAME] = password
        }
        contextAttributes
    }
}

The DefaultOAuth2AuthorizedClientManager is designed to be used within the context of a HttpServletRequest. When operating outside of a HttpServletRequest context, use AuthorizedClientServiceOAuth2AuthorizedClientManager instead.

A service application is a common use case for when to use an AuthorizedClientServiceOAuth2AuthorizedClientManager. Service applications often run in the background, without any user interaction, and typically run under a system-level account instead of a user account. An OAuth 2.0 Client configured with the client_credentials grant type can be considered a type of service application.

The following code shows an example of how to configure an AuthorizedClientServiceOAuth2AuthorizedClientManager that provides support for the client_credentials grant type:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientService authorizedClientService) {

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.clientCredentials()
					.build();

	AuthorizedClientServiceOAuth2AuthorizedClientManager authorizedClientManager =
			new AuthorizedClientServiceOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientService);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	return authorizedClientManager;
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientService: OAuth2AuthorizedClientService): OAuth2AuthorizedClientManager {
    val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .clientCredentials()
            .build()
    val authorizedClientManager = AuthorizedClientServiceOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientService)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)
    return authorizedClientManager
}

Authorization Grant Support

Authorization Code

Please refer to the OAuth 2.0 Authorization Framework for further details on the Authorization Code grant.

Obtaining Authorization

Please refer to the Authorization Request/Response protocol flow for the Authorization Code grant.

Initiating the Authorization Request

The OAuth2AuthorizationRequestRedirectFilter uses an OAuth2AuthorizationRequestResolver to resolve an OAuth2AuthorizationRequest and initiate the Authorization Code grant flow by redirecting the end-user’s user-agent to the Authorization Server’s Authorization Endpoint.

The primary role of the OAuth2AuthorizationRequestResolver is to resolve an OAuth2AuthorizationRequest from the provided web request. The default implementation DefaultOAuth2AuthorizationRequestResolver matches on the (default) path /oauth2/authorization/{registrationId} extracting the registrationId and using it to build the OAuth2AuthorizationRequest for the associated ClientRegistration.

Given the following Spring Boot 2.x properties for an OAuth 2.0 Client registration:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-secret: okta-client-secret
            authorization-grant-type: authorization_code
            redirect-uri: "{baseUrl}/authorized/okta"
            scope: read, write
        provider:
          okta:
            authorization-uri: https://dev-1234.oktapreview.com/oauth2/v1/authorize
            token-uri: https://dev-1234.oktapreview.com/oauth2/v1/token

A request with the base path /oauth2/authorization/okta will initiate the Authorization Request redirect by the OAuth2AuthorizationRequestRedirectFilter and ultimately start the Authorization Code grant flow.

The AuthorizationCodeOAuth2AuthorizedClientProvider is an implementation of OAuth2AuthorizedClientProvider for the Authorization Code grant, which also initiates the Authorization Request redirect by the OAuth2AuthorizationRequestRedirectFilter.

If the OAuth 2.0 Client is a Public Client, then configure the OAuth 2.0 Client registration as follows:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-authentication-method: none
            authorization-grant-type: authorization_code
            redirect-uri: "{baseUrl}/authorized/okta"
            ...

Public Clients are supported using Proof Key for Code Exchange (PKCE). If the client is running in an untrusted environment (eg. native application or web browser-based application) and therefore incapable of maintaining the confidentiality of it’s credentials, PKCE will automatically be used when the following conditions are true:

client-secret is omitted (or empty)
client-authentication-method is set to "none" (ClientAuthenticationMethod.NONE)

The DefaultOAuth2AuthorizationRequestResolver also supports URI template variables for the redirect-uri using UriComponentsBuilder.

The following configuration uses all the supported URI template variables:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            ...
            redirect-uri: "{baseScheme}://{baseHost}{basePort}{basePath}/authorized/{registrationId}"
            ...

{baseUrl} resolves to {baseScheme}://{baseHost}{basePort}{basePath}

Configuring the redirect-uri with URI template variables is especially useful when the OAuth 2.0 Client is running behind a Proxy Server. This ensures that the X-Forwarded-* headers are used when expanding the redirect-uri.

Customizing the Authorization Request

One of the primary use cases an OAuth2AuthorizationRequestResolver can realize is the ability to customize the Authorization Request with additional parameters above the standard parameters defined in the OAuth 2.0 Authorization Framework.

For example, OpenID Connect defines additional OAuth 2.0 request parameters for the Authorization Code Flow extending from the standard parameters defined in the OAuth 2.0 Authorization Framework. One of those extended parameters is the prompt parameter.

OPTIONAL. Space delimited, case sensitive list of ASCII string values that specifies whether the Authorization Server prompts the End-User for reauthentication and consent. The defined values are: none, login, consent, select_account

The following example shows how to configure the DefaultOAuth2AuthorizationRequestResolver with a Consumer<OAuth2AuthorizationRequest.Builder> that customizes the Authorization Request for oauth2Login(), by including the request parameter prompt=consent.

Java

@EnableWebSecurity
public class OAuth2LoginSecurityConfig extends WebSecurityConfigurerAdapter {

	@Autowired
	private ClientRegistrationRepository clientRegistrationRepository;

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.authorizeRequests(authorize -> authorize
				.anyRequest().authenticated()
			)
			.oauth2Login(oauth2 -> oauth2
				.authorizationEndpoint(authorization -> authorization
					.authorizationRequestResolver(
						authorizationRequestResolver(this.clientRegistrationRepository)
					)
				)
			);
	}

	private OAuth2AuthorizationRequestResolver authorizationRequestResolver(
			ClientRegistrationRepository clientRegistrationRepository) {

		DefaultOAuth2AuthorizationRequestResolver authorizationRequestResolver =
				new DefaultOAuth2AuthorizationRequestResolver(
						clientRegistrationRepository, "/oauth2/authorization");
		authorizationRequestResolver.setAuthorizationRequestCustomizer(
				authorizationRequestCustomizer());

		return  authorizationRequestResolver;
	}

	private Consumer<OAuth2AuthorizationRequest.Builder> authorizationRequestCustomizer() {
		return customizer -> customizer
					.additionalParameters(params -> params.put("prompt", "consent"));
	}
}

Kotlin

@EnableWebSecurity
class SecurityConfig : WebSecurityConfigurerAdapter() {

    @Autowired
    private lateinit var customClientRegistrationRepository: ClientRegistrationRepository

    override fun configure(http: HttpSecurity) {
        http {
            authorizeRequests {
                authorize(anyRequest, authenticated)
            }
            oauth2Login {
                authorizationEndpoint {
                    authorizationRequestResolver = authorizationRequestResolver(customClientRegistrationRepository)
                }
            }
        }
    }

    private fun authorizationRequestResolver(
            clientRegistrationRepository: ClientRegistrationRepository?): OAuth2AuthorizationRequestResolver? {
        val authorizationRequestResolver = DefaultOAuth2AuthorizationRequestResolver(
                clientRegistrationRepository, "/oauth2/authorization")
        authorizationRequestResolver.setAuthorizationRequestCustomizer(
                authorizationRequestCustomizer())
        return authorizationRequestResolver
    }

    private fun authorizationRequestCustomizer(): Consumer<OAuth2AuthorizationRequest.Builder> {
        return Consumer { customizer ->
            customizer
                    .additionalParameters { params -> params["prompt"] = "consent" }
        }
    }
}

For the simple use case, where the additional request parameter is always the same for a specific provider, it may be added directly in the authorization-uri property.

For example, if the value for the request parameter prompt is always consent for the provider okta, than simply configure as follows:

spring:
  security:
    oauth2:
      client:
        provider:
          okta:
            authorization-uri: https://dev-1234.oktapreview.com/oauth2/v1/authorize?prompt=consent

The preceding example shows the common use case of adding a custom parameter on top of the standard parameters. Alternatively, if your requirements are more advanced, you can take full control in building the Authorization Request URI by simply overriding the OAuth2AuthorizationRequest.authorizationRequestUri property.

OAuth2AuthorizationRequest.Builder.build() constructs the OAuth2AuthorizationRequest.authorizationRequestUri, which represents the Authorization Request URI including all query parameters using the application/x-www-form-urlencoded format.

The following example shows a variation of authorizationRequestCustomizer() from the preceding example, and instead overrides the OAuth2AuthorizationRequest.authorizationRequestUri property.

Java

private Consumer<OAuth2AuthorizationRequest.Builder> authorizationRequestCustomizer() {
	return customizer -> customizer
				.authorizationRequestUri(uriBuilder -> uriBuilder
					.queryParam("prompt", "consent").build());
}

Kotlin

private fun authorizationRequestCustomizer(): Consumer<OAuth2AuthorizationRequest.Builder> {
    return Consumer { customizer: OAuth2AuthorizationRequest.Builder ->
        customizer
                .authorizationRequestUri { uriBuilder: UriBuilder ->
                    uriBuilder
                            .queryParam("prompt", "consent").build()
                }
    }
}

Storing the Authorization Request

The AuthorizationRequestRepository is responsible for the persistence of the OAuth2AuthorizationRequest from the time the Authorization Request is initiated to the time the Authorization Response is received (the callback).

The OAuth2AuthorizationRequest is used to correlate and validate the Authorization Response.

The default implementation of AuthorizationRequestRepository is HttpSessionOAuth2AuthorizationRequestRepository, which stores the OAuth2AuthorizationRequest in the HttpSession.

If you have a custom implementation of AuthorizationRequestRepository, you may configure it as shown in the following example:

Example 3. AuthorizationRequestRepository Configuration

Java

@EnableWebSecurity
public class OAuth2ClientSecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.oauth2Client(oauth2 -> oauth2
				.authorizationCodeGrant(codeGrant -> codeGrant
					.authorizationRequestRepository(this.authorizationRequestRepository())
					...
				)
			);
	}
}

Kotlin

@EnableWebSecurity
class OAuth2ClientSecurityConfig : WebSecurityConfigurerAdapter() {

    override fun configure(http: HttpSecurity) {
        http {
            oauth2Client {
                authorizationCodeGrant {
                    authorizationRequestRepository = authorizationRequestRepository()
                }
            }
        }
    }
}

Xml

<http>
	<oauth2-client>
		<authorization-code-grant authorization-request-repository-ref="authorizationRequestRepository"/>
	</oauth2-client>
</http>

Requesting an Access Token

Please refer to the Access Token Request/Response protocol flow for the Authorization Code grant.

The default implementation of OAuth2AccessTokenResponseClient for the Authorization Code grant is DefaultAuthorizationCodeTokenResponseClient, which uses a RestOperations for exchanging an authorization code for an access token at the Authorization Server’s Token Endpoint.

The DefaultAuthorizationCodeTokenResponseClient is quite flexible as it allows you to customize the pre-processing of the Token Request and/or post-handling of the Token Response.

Customizing the Access Token Request

If you need to customize the pre-processing of the Token Request, you can provide DefaultAuthorizationCodeTokenResponseClient.setRequestEntityConverter() with a custom Converter<OAuth2AuthorizationCodeGrantRequest, RequestEntity<?>>. The default implementation OAuth2AuthorizationCodeGrantRequestEntityConverter builds a RequestEntity representation of a standard OAuth 2.0 Access Token Request. However, providing a custom Converter, would allow you to extend the standard Token Request and add custom parameter(s).

The custom Converter must return a valid RequestEntity representation of an OAuth 2.0 Access Token Request that is understood by the intended OAuth 2.0 Provider.

Customizing the Access Token Response

On the other end, if you need to customize the post-handling of the Token Response, you will need to provide DefaultAuthorizationCodeTokenResponseClient.setRestOperations() with a custom configured RestOperations. The default RestOperations is configured as follows:

Java

RestTemplate restTemplate = new RestTemplate(Arrays.asList(
		new FormHttpMessageConverter(),
		new OAuth2AccessTokenResponseHttpMessageConverter()));

restTemplate.setErrorHandler(new OAuth2ErrorResponseErrorHandler());

Kotlin

val restTemplate = RestTemplate(listOf(
        FormHttpMessageConverter(),
        OAuth2AccessTokenResponseHttpMessageConverter()))

restTemplate.errorHandler = OAuth2ErrorResponseErrorHandler()

Spring MVC FormHttpMessageConverter is required as it’s used when sending the OAuth 2.0 Access Token Request.

OAuth2AccessTokenResponseHttpMessageConverter is a HttpMessageConverter for an OAuth 2.0 Access Token Response. You can provide OAuth2AccessTokenResponseHttpMessageConverter.setAccessTokenResponseConverter() with a custom Converter<Map<String, Object>, OAuth2AccessTokenResponse> that is used for converting the OAuth 2.0 Access Token Response parameters to an OAuth2AccessTokenResponse.

OAuth2ErrorResponseErrorHandler is a ResponseErrorHandler that can handle an OAuth 2.0 Error, eg. 400 Bad Request. It uses an OAuth2ErrorHttpMessageConverter for converting the OAuth 2.0 Error parameters to an OAuth2Error.

Whether you customize DefaultAuthorizationCodeTokenResponseClient or provide your own implementation of OAuth2AccessTokenResponseClient, you’ll need to configure it as shown in the following example:

Example 4. Access Token Response Configuration

Java

@EnableWebSecurity
public class OAuth2ClientSecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.oauth2Client(oauth2 -> oauth2
				.authorizationCodeGrant(codeGrant -> codeGrant
					.accessTokenResponseClient(this.accessTokenResponseClient())
					...
				)
			);
	}
}

Kotlin

@EnableWebSecurity
class OAuth2ClientSecurityConfig : WebSecurityConfigurerAdapter() {

    override fun configure(http: HttpSecurity) {
        http {
            oauth2Client {
                authorizationCodeGrant {
                    accessTokenResponseClient = accessTokenResponseClient()
                }
            }
        }
    }
}

Xml

<http>
	<oauth2-client>
		<authorization-code-grant access-token-response-client-ref="accessTokenResponseClient"/>
	</oauth2-client>
</http>

Refresh Token

Please refer to the OAuth 2.0 Authorization Framework for further details on the Refresh Token.

Refreshing an Access Token

Please refer to the Access Token Request/Response protocol flow for the Refresh Token grant.

The default implementation of OAuth2AccessTokenResponseClient for the Refresh Token grant is DefaultRefreshTokenTokenResponseClient, which uses a RestOperations when refreshing an access token at the Authorization Server’s Token Endpoint.

The DefaultRefreshTokenTokenResponseClient is quite flexible as it allows you to customize the pre-processing of the Token Request and/or post-handling of the Token Response.

Customizing the Access Token Request

If you need to customize the pre-processing of the Token Request, you can provide DefaultRefreshTokenTokenResponseClient.setRequestEntityConverter() with a custom Converter<OAuth2RefreshTokenGrantRequest, RequestEntity<?>>. The default implementation OAuth2RefreshTokenGrantRequestEntityConverter builds a RequestEntity representation of a standard OAuth 2.0 Access Token Request. However, providing a custom Converter, would allow you to extend the standard Token Request and add custom parameter(s).

The custom Converter must return a valid RequestEntity representation of an OAuth 2.0 Access Token Request that is understood by the intended OAuth 2.0 Provider.

Customizing the Access Token Response

On the other end, if you need to customize the post-handling of the Token Response, you will need to provide DefaultRefreshTokenTokenResponseClient.setRestOperations() with a custom configured RestOperations. The default RestOperations is configured as follows:

Java

RestTemplate restTemplate = new RestTemplate(Arrays.asList(
		new FormHttpMessageConverter(),
		new OAuth2AccessTokenResponseHttpMessageConverter()));

restTemplate.setErrorHandler(new OAuth2ErrorResponseErrorHandler());

Kotlin

val restTemplate = RestTemplate(listOf(
        FormHttpMessageConverter(),
        OAuth2AccessTokenResponseHttpMessageConverter()))

restTemplate.errorHandler = OAuth2ErrorResponseErrorHandler()

Spring MVC FormHttpMessageConverter is required as it’s used when sending the OAuth 2.0 Access Token Request.

Whether you customize DefaultRefreshTokenTokenResponseClient or provide your own implementation of OAuth2AccessTokenResponseClient, you’ll need to configure it as shown in the following example:

Java

// Customize
OAuth2AccessTokenResponseClient<OAuth2RefreshTokenGrantRequest> refreshTokenTokenResponseClient = ...

OAuth2AuthorizedClientProvider authorizedClientProvider =
		OAuth2AuthorizedClientProviderBuilder.builder()
				.authorizationCode()
				.refreshToken(configurer -> configurer.accessTokenResponseClient(refreshTokenTokenResponseClient))
				.build();

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

Kotlin

// Customize
val refreshTokenTokenResponseClient: OAuth2AccessTokenResponseClient<OAuth2RefreshTokenGrantRequest> = ...

val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
        .authorizationCode()
        .refreshToken { it.accessTokenResponseClient(refreshTokenTokenResponseClient) }
        .build()

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)

OAuth2AuthorizedClientProviderBuilder.builder().refreshToken() configures a RefreshTokenOAuth2AuthorizedClientProvider, which is an implementation of an OAuth2AuthorizedClientProvider for the Refresh Token grant.

The OAuth2RefreshToken may optionally be returned in the Access Token Response for the authorization_code and password grant types. If the OAuth2AuthorizedClient.getRefreshToken() is available and the OAuth2AuthorizedClient.getAccessToken() is expired, it will automatically be refreshed by the RefreshTokenOAuth2AuthorizedClientProvider.

Client Credentials

Please refer to the OAuth 2.0 Authorization Framework for further details on the Client Credentials grant.

Requesting an Access Token

Please refer to the Access Token Request/Response protocol flow for the Client Credentials grant.

The default implementation of OAuth2AccessTokenResponseClient for the Client Credentials grant is DefaultClientCredentialsTokenResponseClient, which uses a RestOperations when requesting an access token at the Authorization Server’s Token Endpoint.

The DefaultClientCredentialsTokenResponseClient is quite flexible as it allows you to customize the pre-processing of the Token Request and/or post-handling of the Token Response.

Customizing the Access Token Request

If you need to customize the pre-processing of the Token Request, you can provide DefaultClientCredentialsTokenResponseClient.setRequestEntityConverter() with a custom Converter<OAuth2ClientCredentialsGrantRequest, RequestEntity<?>>. The default implementation OAuth2ClientCredentialsGrantRequestEntityConverter builds a RequestEntity representation of a standard OAuth 2.0 Access Token Request. However, providing a custom Converter, would allow you to extend the standard Token Request and add custom parameter(s).

The custom Converter must return a valid RequestEntity representation of an OAuth 2.0 Access Token Request that is understood by the intended OAuth 2.0 Provider.

Customizing the Access Token Response

On the other end, if you need to customize the post-handling of the Token Response, you will need to provide DefaultClientCredentialsTokenResponseClient.setRestOperations() with a custom configured RestOperations. The default RestOperations is configured as follows:

Java

RestTemplate restTemplate = new RestTemplate(Arrays.asList(
		new FormHttpMessageConverter(),
		new OAuth2AccessTokenResponseHttpMessageConverter()));

restTemplate.setErrorHandler(new OAuth2ErrorResponseErrorHandler());

Kotlin

val restTemplate = RestTemplate(listOf(
        FormHttpMessageConverter(),
        OAuth2AccessTokenResponseHttpMessageConverter()))

restTemplate.errorHandler = OAuth2ErrorResponseErrorHandler()

Spring MVC FormHttpMessageConverter is required as it’s used when sending the OAuth 2.0 Access Token Request.

Whether you customize DefaultClientCredentialsTokenResponseClient or provide your own implementation of OAuth2AccessTokenResponseClient, you’ll need to configure it as shown in the following example:

Java

// Customize
OAuth2AccessTokenResponseClient<OAuth2ClientCredentialsGrantRequest> clientCredentialsTokenResponseClient = ...

OAuth2AuthorizedClientProvider authorizedClientProvider =
		OAuth2AuthorizedClientProviderBuilder.builder()
				.clientCredentials(configurer -> configurer.accessTokenResponseClient(clientCredentialsTokenResponseClient))
				.build();

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

Kotlin

// Customize
val clientCredentialsTokenResponseClient: OAuth2AccessTokenResponseClient<OAuth2ClientCredentialsGrantRequest> = ...

val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
        .clientCredentials { it.accessTokenResponseClient(clientCredentialsTokenResponseClient) }
        .build()

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)

OAuth2AuthorizedClientProviderBuilder.builder().clientCredentials() configures a ClientCredentialsOAuth2AuthorizedClientProvider, which is an implementation of an OAuth2AuthorizedClientProvider for the Client Credentials grant.

Using the Access Token

Given the following Spring Boot 2.x properties for an OAuth 2.0 Client registration:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-secret: okta-client-secret
            authorization-grant-type: client_credentials
            scope: read, write
        provider:
          okta:
            token-uri: https://dev-1234.oktapreview.com/oauth2/v1/token

…and the OAuth2AuthorizedClientManager @Bean:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientRepository authorizedClientRepository) {

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.clientCredentials()
					.build();

	DefaultOAuth2AuthorizedClientManager authorizedClientManager =
			new DefaultOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientRepository);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	return authorizedClientManager;
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientRepository: OAuth2AuthorizedClientRepository): OAuth2AuthorizedClientManager {
    val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .clientCredentials()
            .build()
    val authorizedClientManager = DefaultOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientRepository)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)
    return authorizedClientManager
}

You may obtain the OAuth2AccessToken as follows:

Java

@Controller
public class OAuth2ClientController {

	@Autowired
	private OAuth2AuthorizedClientManager authorizedClientManager;

	@GetMapping("/")
	public String index(Authentication authentication,
						HttpServletRequest servletRequest,
						HttpServletResponse servletResponse) {

		OAuth2AuthorizeRequest authorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId("okta")
				.principal(authentication)
				.attributes(attrs -> {
					attrs.put(HttpServletRequest.class.getName(), servletRequest);
					attrs.put(HttpServletResponse.class.getName(), servletResponse);
				})
				.build();
		OAuth2AuthorizedClient authorizedClient = this.authorizedClientManager.authorize(authorizeRequest);

		OAuth2AccessToken accessToken = authorizedClient.getAccessToken();

		...

		return "index";
	}
}

Kotlin

class OAuth2ClientController {

    @Autowired
    private lateinit var authorizedClientManager: OAuth2AuthorizedClientManager

    @GetMapping("/")
    fun index(authentication: Authentication?,
              servletRequest: HttpServletRequest,
              servletResponse: HttpServletResponse): String {
        val authorizeRequest: OAuth2AuthorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId("okta")
                .principal(authentication)
                .attributes(Consumer { attrs: MutableMap<String, Any> ->
                    attrs[HttpServletRequest::class.java.name] = servletRequest
                    attrs[HttpServletResponse::class.java.name] = servletResponse
                })
                .build()
        val authorizedClient = authorizedClientManager.authorize(authorizeRequest)
        val accessToken: OAuth2AccessToken = authorizedClient.accessToken

        ...

        return "index"
    }
}

HttpServletRequest and HttpServletResponse are both OPTIONAL attributes. If not provided, it will default to ServletRequestAttributes using RequestContextHolder.getRequestAttributes().

Resource Owner Password Credentials

Please refer to the OAuth 2.0 Authorization Framework for further details on the Resource Owner Password Credentials grant.

Requesting an Access Token

Please refer to the Access Token Request/Response protocol flow for the Resource Owner Password Credentials grant.

The default implementation of OAuth2AccessTokenResponseClient for the Resource Owner Password Credentials grant is DefaultPasswordTokenResponseClient, which uses a RestOperations when requesting an access token at the Authorization Server’s Token Endpoint.

The DefaultPasswordTokenResponseClient is quite flexible as it allows you to customize the pre-processing of the Token Request and/or post-handling of the Token Response.

Customizing the Access Token Request

If you need to customize the pre-processing of the Token Request, you can provide DefaultPasswordTokenResponseClient.setRequestEntityConverter() with a custom Converter<OAuth2PasswordGrantRequest, RequestEntity<?>>. The default implementation OAuth2PasswordGrantRequestEntityConverter builds a RequestEntity representation of a standard OAuth 2.0 Access Token Request. However, providing a custom Converter, would allow you to extend the standard Token Request and add custom parameter(s).

The custom Converter must return a valid RequestEntity representation of an OAuth 2.0 Access Token Request that is understood by the intended OAuth 2.0 Provider.

Customizing the Access Token Response

On the other end, if you need to customize the post-handling of the Token Response, you will need to provide DefaultPasswordTokenResponseClient.setRestOperations() with a custom configured RestOperations. The default RestOperations is configured as follows:

Java

RestTemplate restTemplate = new RestTemplate(Arrays.asList(
		new FormHttpMessageConverter(),
		new OAuth2AccessTokenResponseHttpMessageConverter()));

restTemplate.setErrorHandler(new OAuth2ErrorResponseErrorHandler());

Kotlin

val restTemplate = RestTemplate(listOf(
        FormHttpMessageConverter(),
        OAuth2AccessTokenResponseHttpMessageConverter()))

restTemplate.errorHandler = OAuth2ErrorResponseErrorHandler()

Spring MVC FormHttpMessageConverter is required as it’s used when sending the OAuth 2.0 Access Token Request.

Whether you customize DefaultPasswordTokenResponseClient or provide your own implementation of OAuth2AccessTokenResponseClient, you’ll need to configure it as shown in the following example:

Java

// Customize
OAuth2AccessTokenResponseClient<OAuth2PasswordGrantRequest> passwordTokenResponseClient = ...

OAuth2AuthorizedClientProvider authorizedClientProvider =
		OAuth2AuthorizedClientProviderBuilder.builder()
				.password(configurer -> configurer.accessTokenResponseClient(passwordTokenResponseClient))
				.refreshToken()
				.build();

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

Kotlin

val passwordTokenResponseClient: OAuth2AccessTokenResponseClient<OAuth2PasswordGrantRequest> = ...

val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
        .password { it.accessTokenResponseClient(passwordTokenResponseClient) }
        .refreshToken()
        .build()

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)

OAuth2AuthorizedClientProviderBuilder.builder().password() configures a PasswordOAuth2AuthorizedClientProvider, which is an implementation of an OAuth2AuthorizedClientProvider for the Resource Owner Password Credentials grant.

Using the Access Token

Given the following Spring Boot 2.x properties for an OAuth 2.0 Client registration:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-secret: okta-client-secret
            authorization-grant-type: password
            scope: read, write
        provider:
          okta:
            token-uri: https://dev-1234.oktapreview.com/oauth2/v1/token

…and the OAuth2AuthorizedClientManager @Bean:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientRepository authorizedClientRepository) {

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.password()
					.refreshToken()
					.build();

	DefaultOAuth2AuthorizedClientManager authorizedClientManager =
			new DefaultOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientRepository);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	// Assuming the `username` and `password` are supplied as `HttpServletRequest` parameters,
	// map the `HttpServletRequest` parameters to `OAuth2AuthorizationContext.getAttributes()`
	authorizedClientManager.setContextAttributesMapper(contextAttributesMapper());

	return authorizedClientManager;
}

private Function<OAuth2AuthorizeRequest, Map<String, Object>> contextAttributesMapper() {
	return authorizeRequest -> {
		Map<String, Object> contextAttributes = Collections.emptyMap();
		HttpServletRequest servletRequest = authorizeRequest.getAttribute(HttpServletRequest.class.getName());
		String username = servletRequest.getParameter(OAuth2ParameterNames.USERNAME);
		String password = servletRequest.getParameter(OAuth2ParameterNames.PASSWORD);
		if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
			contextAttributes = new HashMap<>();

			// `PasswordOAuth2AuthorizedClientProvider` requires both attributes
			contextAttributes.put(OAuth2AuthorizationContext.USERNAME_ATTRIBUTE_NAME, username);
			contextAttributes.put(OAuth2AuthorizationContext.PASSWORD_ATTRIBUTE_NAME, password);
		}
		return contextAttributes;
	};
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientRepository: OAuth2AuthorizedClientRepository): OAuth2AuthorizedClientManager {
    val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .password()
            .refreshToken()
            .build()
    val authorizedClientManager = DefaultOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientRepository)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)

    // Assuming the `username` and `password` are supplied as `HttpServletRequest` parameters,
    // map the `HttpServletRequest` parameters to `OAuth2AuthorizationContext.getAttributes()`
    authorizedClientManager.setContextAttributesMapper(contextAttributesMapper())
    return authorizedClientManager
}

private fun contextAttributesMapper(): Function<OAuth2AuthorizeRequest, MutableMap<String, Any>> {
    return Function { authorizeRequest ->
        var contextAttributes: MutableMap<String, Any> = mutableMapOf()
        val servletRequest: HttpServletRequest = authorizeRequest.getAttribute(HttpServletRequest::class.java.name)
        val username = servletRequest.getParameter(OAuth2ParameterNames.USERNAME)
        val password = servletRequest.getParameter(OAuth2ParameterNames.PASSWORD)
        if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
            contextAttributes = hashMapOf()

            // `PasswordOAuth2AuthorizedClientProvider` requires both attributes
            contextAttributes[OAuth2AuthorizationContext.USERNAME_ATTRIBUTE_NAME] = username
            contextAttributes[OAuth2AuthorizationContext.PASSWORD_ATTRIBUTE_NAME] = password
        }
        contextAttributes
    }
}

You may obtain the OAuth2AccessToken as follows:

Java

@Controller
public class OAuth2ClientController {

	@Autowired
	private OAuth2AuthorizedClientManager authorizedClientManager;

	@GetMapping("/")
	public String index(Authentication authentication,
						HttpServletRequest servletRequest,
						HttpServletResponse servletResponse) {

		OAuth2AuthorizeRequest authorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId("okta")
				.principal(authentication)
				.attributes(attrs -> {
					attrs.put(HttpServletRequest.class.getName(), servletRequest);
					attrs.put(HttpServletResponse.class.getName(), servletResponse);
				})
				.build();
		OAuth2AuthorizedClient authorizedClient = this.authorizedClientManager.authorize(authorizeRequest);

		OAuth2AccessToken accessToken = authorizedClient.getAccessToken();

		...

		return "index";
	}
}

Kotlin

@Controller
class OAuth2ClientController {
    @Autowired
    private lateinit var authorizedClientManager: OAuth2AuthorizedClientManager

    @GetMapping("/")
    fun index(authentication: Authentication?,
              servletRequest: HttpServletRequest,
              servletResponse: HttpServletResponse): String {
        val authorizeRequest: OAuth2AuthorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId("okta")
                .principal(authentication)
                .attributes(Consumer {
                    it[HttpServletRequest::class.java.name] = servletRequest
                    it[HttpServletResponse::class.java.name] = servletResponse
                })
                .build()
        val authorizedClient = authorizedClientManager.authorize(authorizeRequest)
        val accessToken: OAuth2AccessToken = authorizedClient.accessToken

        ...

        return "index"
    }
}

HttpServletRequest and HttpServletResponse are both OPTIONAL attributes. If not provided, it will default to ServletRequestAttributes using RequestContextHolder.getRequestAttributes().

JWT Bearer

Please refer to JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication and Authorization Grants for further details on the JWT Bearer grant.

Requesting an Access Token

Please refer to the Access Token Request/Response protocol flow for the JWT Bearer grant.

The default implementation of OAuth2AccessTokenResponseClient for the JWT Bearer grant is DefaultJwtBearerTokenResponseClient, which uses a RestOperations when requesting an access token at the Authorization Server’s Token Endpoint.

The DefaultJwtBearerTokenResponseClient is quite flexible as it allows you to customize the pre-processing of the Token Request and/or post-handling of the Token Response.

Customizing the Access Token Request

If you need to customize the pre-processing of the Token Request, you can provide DefaultJwtBearerTokenResponseClient.setRequestEntityConverter() with a custom Converter<JwtBearerGrantRequest, RequestEntity<?>>. The default implementation JwtBearerGrantRequestEntityConverter builds a RequestEntity representation of a OAuth 2.0 Access Token Request. However, providing a custom Converter, would allow you to extend the Token Request and add custom parameter(s).

Customizing the Access Token Response

On the other end, if you need to customize the post-handling of the Token Response, you will need to provide DefaultJwtBearerTokenResponseClient.setRestOperations() with a custom configured RestOperations. The default RestOperations is configured as follows:

Java

RestTemplate restTemplate = new RestTemplate(Arrays.asList(
		new FormHttpMessageConverter(),
		new OAuth2AccessTokenResponseHttpMessageConverter()));

restTemplate.setErrorHandler(new OAuth2ErrorResponseErrorHandler());

Kotlin

val restTemplate = RestTemplate(listOf(
        FormHttpMessageConverter(),
        OAuth2AccessTokenResponseHttpMessageConverter()))

restTemplate.errorHandler = OAuth2ErrorResponseErrorHandler()

Spring MVC FormHttpMessageConverter is required as it’s used when sending the OAuth 2.0 Access Token Request.

Whether you customize DefaultJwtBearerTokenResponseClient or provide your own implementation of OAuth2AccessTokenResponseClient, you’ll need to configure it as shown in the following example:

Java

// Customize
OAuth2AccessTokenResponseClient<JwtBearerGrantRequest> jwtBearerTokenResponseClient = ...

JwtBearerOAuth2AuthorizedClientProvider jwtBearerAuthorizedClientProvider = new JwtBearerOAuth2AuthorizedClientProvider();
jwtBearerAuthorizedClientProvider.setAccessTokenResponseClient(jwtBearerTokenResponseClient);

OAuth2AuthorizedClientProvider authorizedClientProvider =
		OAuth2AuthorizedClientProviderBuilder.builder()
				.provider(jwtBearerAuthorizedClientProvider)
				.build();

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

Kotlin

// Customize
val jwtBearerTokenResponseClient: OAuth2AccessTokenResponseClient<JwtBearerGrantRequest> = ...

val jwtBearerAuthorizedClientProvider = JwtBearerOAuth2AuthorizedClientProvider()
jwtBearerAuthorizedClientProvider.setAccessTokenResponseClient(jwtBearerTokenResponseClient);

val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
        .provider(jwtBearerAuthorizedClientProvider)
        .build()

...

authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)

Using the Access Token

Given the following Spring Boot 2.x properties for an OAuth 2.0 Client registration:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-secret: okta-client-secret
            authorization-grant-type: urn:ietf:params:oauth:grant-type:jwt-bearer
            scope: read
        provider:
          okta:
            token-uri: https://dev-1234.oktapreview.com/oauth2/v1/token

…and the OAuth2AuthorizedClientManager @Bean:

Java

@Bean
public OAuth2AuthorizedClientManager authorizedClientManager(
		ClientRegistrationRepository clientRegistrationRepository,
		OAuth2AuthorizedClientRepository authorizedClientRepository) {

	JwtBearerOAuth2AuthorizedClientProvider jwtBearerAuthorizedClientProvider =
			new JwtBearerOAuth2AuthorizedClientProvider();

	OAuth2AuthorizedClientProvider authorizedClientProvider =
			OAuth2AuthorizedClientProviderBuilder.builder()
					.provider(jwtBearerAuthorizedClientProvider)
					.build();

	DefaultOAuth2AuthorizedClientManager authorizedClientManager =
			new DefaultOAuth2AuthorizedClientManager(
					clientRegistrationRepository, authorizedClientRepository);
	authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

	return authorizedClientManager;
}

Kotlin

@Bean
fun authorizedClientManager(
        clientRegistrationRepository: ClientRegistrationRepository,
        authorizedClientRepository: OAuth2AuthorizedClientRepository): OAuth2AuthorizedClientManager {
    val jwtBearerAuthorizedClientProvider = JwtBearerOAuth2AuthorizedClientProvider()
    val authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
            .provider(jwtBearerAuthorizedClientProvider)
            .build()
    val authorizedClientManager = DefaultOAuth2AuthorizedClientManager(
            clientRegistrationRepository, authorizedClientRepository)
    authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider)
    return authorizedClientManager
}

You may obtain the OAuth2AccessToken as follows:

Java

@RestController
public class OAuth2ResourceServerController {

	@Autowired
	private OAuth2AuthorizedClientManager authorizedClientManager;

	@GetMapping("/resource")
	public String resource(JwtAuthenticationToken jwtAuthentication) {
		OAuth2AuthorizeRequest authorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId("okta")
				.principal(jwtAuthentication)
				.build();
		OAuth2AuthorizedClient authorizedClient = this.authorizedClientManager.authorize(authorizeRequest);
		OAuth2AccessToken accessToken = authorizedClient.getAccessToken();

		...

	}
}

Kotlin

class OAuth2ResourceServerController {

    @Autowired
    private lateinit var authorizedClientManager: OAuth2AuthorizedClientManager

    @GetMapping("/resource")
    fun resource(jwtAuthentication: JwtAuthenticationToken?): String {
        val authorizeRequest: OAuth2AuthorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId("okta")
                .principal(jwtAuthentication)
                .build()
        val authorizedClient = authorizedClientManager.authorize(authorizeRequest)
        val accessToken: OAuth2AccessToken = authorizedClient.accessToken

        ...

    }
}

Client Authentication Support

JWT Bearer

Please refer to JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication and Authorization Grants for further details on JWT Bearer Client Authentication.

The default implementation for JWT Bearer Client Authentication is NimbusJwtClientAuthenticationParametersConverter, which is a Converter that customizes the Token Request parameters by adding a signed JSON Web Token (JWS) in the client_assertion parameter.

The java.security.PrivateKey or javax.crypto.SecretKey used for signing the JWS is supplied by the com.nimbusds.jose.jwk.JWK resolver associated with NimbusJwtClientAuthenticationParametersConverter.

Authenticate using `private_key_jwt`

Given the following Spring Boot 2.x properties for an OAuth 2.0 Client registration:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-authentication-method: private_key_jwt
            authorization-grant-type: authorization_code
            ...

The following example shows how to configure DefaultAuthorizationCodeTokenResponseClient:

Java

Function<ClientRegistration, JWK> jwkResolver = (clientRegistration) -> {
	if (clientRegistration.getClientAuthenticationMethod().equals(ClientAuthenticationMethod.PRIVATE_KEY_JWT)) {
		// Assuming RSA key type
		RSAPublicKey publicKey = ...
		RSAPrivateKey privateKey = ...
		return new RSAKey.Builder(publicKey)
				.privateKey(privateKey)
				.keyID(UUID.randomUUID().toString())
				.build();
	}
	return null;
};

OAuth2AuthorizationCodeGrantRequestEntityConverter requestEntityConverter =
		new OAuth2AuthorizationCodeGrantRequestEntityConverter();
requestEntityConverter.addParametersConverter(
		new NimbusJwtClientAuthenticationParametersConverter<>(jwkResolver));

DefaultAuthorizationCodeTokenResponseClient tokenResponseClient =
		new DefaultAuthorizationCodeTokenResponseClient();
tokenResponseClient.setRequestEntityConverter(requestEntityConverter);

Kotlin

val jwkResolver: Function<ClientRegistration, JWK> =
    Function<ClientRegistration, JWK> { clientRegistration ->
        if (clientRegistration.clientAuthenticationMethod.equals(ClientAuthenticationMethod.PRIVATE_KEY_JWT)) {
            // Assuming RSA key type
            var publicKey: RSAPublicKey
            var privateKey: RSAPrivateKey
            RSAKey.Builder(publicKey) = //...
                .privateKey(privateKey) = //...
                .keyID(UUID.randomUUID().toString())
                .build()
        }
        null
    }

val requestEntityConverter = OAuth2AuthorizationCodeGrantRequestEntityConverter()
requestEntityConverter.addParametersConverter(
    NimbusJwtClientAuthenticationParametersConverter(jwkResolver)
)

val tokenResponseClient = DefaultAuthorizationCodeTokenResponseClient()
tokenResponseClient.setRequestEntityConverter(requestEntityConverter)

Authenticate using `client_secret_jwt`

Given the following Spring Boot 2.x properties for an OAuth 2.0 Client registration:

spring:
  security:
    oauth2:
      client:
        registration:
          okta:
            client-id: okta-client-id
            client-secret: okta-client-secret
            client-authentication-method: client_secret_jwt
            authorization-grant-type: client_credentials
            ...

The following example shows how to configure DefaultClientCredentialsTokenResponseClient:

Java

Function<ClientRegistration, JWK> jwkResolver = (clientRegistration) -> {
	if (clientRegistration.getClientAuthenticationMethod().equals(ClientAuthenticationMethod.CLIENT_SECRET_JWT)) {
		SecretKeySpec secretKey = new SecretKeySpec(
				clientRegistration.getClientSecret().getBytes(StandardCharsets.UTF_8),
				"HmacSHA256");
		return new OctetSequenceKey.Builder(secretKey)
				.keyID(UUID.randomUUID().toString())
				.build();
	}
	return null;
};

OAuth2ClientCredentialsGrantRequestEntityConverter requestEntityConverter =
		new OAuth2ClientCredentialsGrantRequestEntityConverter();
requestEntityConverter.addParametersConverter(
		new NimbusJwtClientAuthenticationParametersConverter<>(jwkResolver));

DefaultClientCredentialsTokenResponseClient tokenResponseClient =
		new DefaultClientCredentialsTokenResponseClient();
tokenResponseClient.setRequestEntityConverter(requestEntityConverter);

Kotlin

val jwkResolver = Function<ClientRegistration, JWK?> { clientRegistration: ClientRegistration ->
    if (clientRegistration.clientAuthenticationMethod == ClientAuthenticationMethod.CLIENT_SECRET_JWT) {
        val secretKey = SecretKeySpec(
            clientRegistration.clientSecret.toByteArray(StandardCharsets.UTF_8),
            "HmacSHA256"
        )
        OctetSequenceKey.Builder(secretKey)
            .keyID(UUID.randomUUID().toString())
            .build()
    }
    null
}

val requestEntityConverter = OAuth2ClientCredentialsGrantRequestEntityConverter()
requestEntityConverter.addParametersConverter(
    NimbusJwtClientAuthenticationParametersConverter(jwkResolver)
)

val tokenResponseClient = DefaultClientCredentialsTokenResponseClient()
tokenResponseClient.setRequestEntityConverter(requestEntityConverter)

Additional Features

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.

Java

@Controller
public class OAuth2ClientController {

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

		...

		return "index";
	}
}

Kotlin

@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 it’s capabilities.

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 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:

Java

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

Kotlin

@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

@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

@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

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

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

	...

	return "index";
}

Kotlin

@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:

Java

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

Kotlin

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

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:

Java

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

Kotlin

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

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

OAuth 2.0 Client

Core Interfaces / Classes

ClientRegistration

ClientRegistrationRepository

OAuth2AuthorizedClient

OAuth2AuthorizedClientRepository / OAuth2AuthorizedClientService

OAuth2AuthorizedClientManager / OAuth2AuthorizedClientProvider

Authorization Grant Support

Authorization Code

Obtaining Authorization

Initiating the Authorization Request

Customizing the Authorization Request

Storing the Authorization Request

Requesting an Access Token

Customizing the Access Token Request

Customizing the Access Token Response

Refresh Token

Refreshing an Access Token

Customizing the Access Token Request

Customizing the Access Token Response

Client Credentials

Requesting an Access Token

Customizing the Access Token Request

Customizing the Access Token Response

Using the Access Token

Resource Owner Password Credentials

Requesting an Access Token

Customizing the Access Token Request

Customizing the Access Token Response

Using the Access Token

JWT Bearer

Requesting an Access Token

Customizing the Access Token Request

Customizing the Access Token Response

Using the Access Token

Client Authentication Support

JWT Bearer

Authenticate using private_key_jwt

Authenticate using client_secret_jwt

Additional Features

Resolving an Authorized Client

WebClient integration for Servlet Environments

Providing the Authorized Client

Defaulting the Authorized Client

Authenticate using `private_key_jwt`

Authenticate using `client_secret_jwt`