[[oauth2login-advanced]]
= Advanced Configuration

`HttpSecurity.oauth2Login()` provides a number of configuration options for customizing OAuth 2.0 Login.
The main configuration options are grouped into their protocol endpoint counterparts.

For example, `oauth2Login().authorizationEndpoint()` allows configuring the _Authorization Endpoint_, whereas `oauth2Login().tokenEndpoint()` allows configuring the _Token Endpoint_.

The following code shows an example:

.Advanced OAuth2 Login Configuration
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .authorizationEndpoint(authorization -> authorization
			            ...
			    )
			    .redirectionEndpoint(redirection -> redirection
			            ...
			    )
			    .tokenEndpoint(token -> token
			            ...
			    )
			    .userInfoEndpoint(userInfo -> userInfo
			            ...
			    )
			);
		return http.build();
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                authorizationEndpoint {
                    ...
                }
                redirectionEndpoint {
                    ...
                }
                tokenEndpoint {
                    ...
                }
                userInfoEndpoint {
                    ...
                }
            }
        }
        return http.build()
    }
}
----
======

The main goal of the `oauth2Login()` DSL was to closely align with the naming, as defined in the specifications.

The OAuth 2.0 Authorization Framework defines the https://tools.ietf.org/html/rfc6749#section-3[Protocol Endpoints] as follows:

The authorization process uses two authorization server endpoints (HTTP resources):

* Authorization Endpoint: Used by the client to obtain authorization from the resource owner through user-agent redirection.
* Token Endpoint: Used by the client to exchange an authorization grant for an access token, typically with client authentication.

The authorization process also uses one client endpoint:

* Redirection Endpoint: Used by the authorization server to return responses that contain authorization credentials to the client through the resource owner user-agent.

The OpenID Connect Core 1.0 specification defines the https://openid.net/specs/openid-connect-core-1_0.html#UserInfo[UserInfo Endpoint] as follows:

The UserInfo Endpoint is an OAuth 2.0 Protected Resource that returns claims about the authenticated end-user.
To obtain the requested claims about the end-user, the client makes a request to the UserInfo Endpoint by using an access token obtained through OpenID Connect Authentication.
These claims are normally represented by a JSON object that contains a collection of name-value pairs for the claims.

The following code shows the complete configuration options available for the `oauth2Login()` DSL:

.OAuth2 Login Configuration Options
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .clientRegistrationRepository(this.clientRegistrationRepository())
			    .authorizedClientRepository(this.authorizedClientRepository())
			    .authorizedClientService(this.authorizedClientService())
			    .loginPage("/login")
			    .authorizationEndpoint(authorization -> authorization
			        .baseUri(this.authorizationRequestBaseUri())
			        .authorizationRequestRepository(this.authorizationRequestRepository())
			        .authorizationRequestResolver(this.authorizationRequestResolver())
			    )
			    .redirectionEndpoint(redirection -> redirection
			        .baseUri(this.authorizationResponseBaseUri())
			    )
			    .tokenEndpoint(token -> token
			        .accessTokenResponseClient(this.accessTokenResponseClient())
			    )
			    .userInfoEndpoint(userInfo -> userInfo
			        .userAuthoritiesMapper(this.userAuthoritiesMapper())
			        .userService(this.oauth2UserService())
			        .oidcUserService(this.oidcUserService())
			    )
			);
		return http.build();
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                clientRegistrationRepository = clientRegistrationRepository()
                authorizedClientRepository = authorizedClientRepository()
                authorizedClientService = authorizedClientService()
                loginPage = "/login"
                authorizationEndpoint {
                    baseUri = authorizationRequestBaseUri()
                    authorizationRequestRepository = authorizationRequestRepository()
                    authorizationRequestResolver = authorizationRequestResolver()
                }
                redirectionEndpoint {
                    baseUri = authorizationResponseBaseUri()
                }
                tokenEndpoint {
                    accessTokenResponseClient = accessTokenResponseClient()
                }
                userInfoEndpoint {
                    userAuthoritiesMapper = userAuthoritiesMapper()
                    userService = oauth2UserService()
                    oidcUserService = oidcUserService()
                }
            }
        }
        return http.build()
    }
}
----
======

In addition to the `oauth2Login()` DSL, XML configuration is also supported.

The following code shows the complete configuration options available in the xref:servlet/appendix/namespace/http.adoc#nsa-oauth2-login[ security namespace]:

.OAuth2 Login XML Configuration Options
[source,xml]
----
<http>
	<oauth2-login client-registration-repository-ref="clientRegistrationRepository"
				  authorized-client-repository-ref="authorizedClientRepository"
				  authorized-client-service-ref="authorizedClientService"
				  authorization-request-repository-ref="authorizationRequestRepository"
				  authorization-request-resolver-ref="authorizationRequestResolver"
				  access-token-response-client-ref="accessTokenResponseClient"
				  user-authorities-mapper-ref="userAuthoritiesMapper"
				  user-service-ref="oauth2UserService"
				  oidc-user-service-ref="oidcUserService"
				  login-processing-url="/login/oauth2/code/*"
				  login-page="/login"
				  authentication-success-handler-ref="authenticationSuccessHandler"
				  authentication-failure-handler-ref="authenticationFailureHandler"
				  jwt-decoder-factory-ref="jwtDecoderFactory"/>
</http>
----

The following sections go into more detail on each of the configuration options available:

* <<oauth2login-advanced-login-page>>
* <<oauth2login-advanced-redirection-endpoint>>
* <<oauth2login-advanced-userinfo-endpoint>>
* <<oauth2login-advanced-idtoken-verify>>
* <<oauth2login-advanced-oidc-logout>>


[[oauth2login-advanced-login-page]]
== OAuth 2.0 Login Page

By default, the OAuth 2.0 Login Page is auto-generated by the `DefaultLoginPageGeneratingFilter`.
The default login page shows each configured OAuth Client with its `ClientRegistration.clientName` as a link, which is capable of initiating the Authorization Request (or OAuth 2.0 Login).

[NOTE]
====
For `DefaultLoginPageGeneratingFilter` to show links for configured OAuth Clients, the registered `ClientRegistrationRepository` needs to also implement `Iterable<ClientRegistration>`.
See `InMemoryClientRegistrationRepository` for reference.
====

The link's destination for each OAuth Client defaults to the following:

`+OAuth2AuthorizationRequestRedirectFilter.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI + "/{registrationId}"+`

The following line shows an example:

[source,html]
----
<a href="/oauth2/authorization/google">Google</a>
----

To override the default login page, configure `oauth2Login().loginPage()` and (optionally) `oauth2Login().authorizationEndpoint().baseUri()`.

The following listing shows an example:

.OAuth2 Login Page Configuration
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .loginPage("/login/oauth2")
			    ...
			    .authorizationEndpoint(authorization -> authorization
			        .baseUri("/login/oauth2/authorization")
			        ...
			    )
			);
		return http.build();
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                loginPage = "/login/oauth2"
                authorizationEndpoint {
                    baseUri = "/login/oauth2/authorization"
                }
            }
        }
        return http.build()
    }
}
----

Xml::
+
[source,xml,role="secondary"]
----
<http>
	<oauth2-login login-page="/login/oauth2"
				  ...
    />
</http>
----
======

[IMPORTANT]
====
You need to provide a `@Controller` with a `@RequestMapping("/login/oauth2")` that is capable of rendering the custom login page.
====

[TIP]
=====
As noted earlier, configuring `oauth2Login().authorizationEndpoint().baseUri()` is optional.
However, if you choose to customize it, ensure the link to each OAuth Client matches the `authorizationEndpoint().baseUri()`.

The following line shows an example:
[source,html]
----
<a href="/login/oauth2/authorization/google">Google</a>
----
=====


[[oauth2login-advanced-redirection-endpoint]]
== Redirection Endpoint

The Redirection Endpoint is used by the Authorization Server for returning the Authorization Response (which contains the authorization credentials) to the client through the Resource Owner user-agent.

[TIP]
====
OAuth 2.0 Login leverages the Authorization Code Grant.
Therefore, the authorization credential is the authorization code.
====

The default Authorization Response `baseUri` (redirection endpoint) is `*/login/oauth2/code/**`, which is defined in `OAuth2LoginAuthenticationFilter.DEFAULT_FILTER_PROCESSES_URI`.

If you would like to customize the Authorization Response `baseUri`, configure it as follows:

.Redirection Endpoint Configuration
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

    @Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .redirectionEndpoint(redirection -> redirection
			        .baseUri("/login/oauth2/callback/*")
			        ...
			    )
			);
		return http.build();
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                redirectionEndpoint {
                    baseUri = "/login/oauth2/callback/*"
                }
            }
        }
        return http.build()
    }
}
----

Xml::
+
[source,xml,role="secondary"]
----
<http>
	<oauth2-login login-processing-url="/login/oauth2/callback/*"
				  ...
    />
</http>
----
======

[IMPORTANT]
=====
You also need to ensure the `ClientRegistration.redirectUri` matches the custom Authorization Response `baseUri`.

The following listing shows an example:

[tabs]
======
Java::
+
[source,java,role="primary",subs="-attributes"]
----
return CommonOAuth2Provider.GOOGLE.getBuilder("google")
	.clientId("google-client-id")
	.clientSecret("google-client-secret")
	.redirectUri("{baseUrl}/login/oauth2/callback/{registrationId}")
	.build();
----

Kotlin::
+
[source,kotlin,role="secondary",subs="-attributes"]
----
return CommonOAuth2Provider.GOOGLE.getBuilder("google")
    .clientId("google-client-id")
    .clientSecret("google-client-secret")
    .redirectUri("{baseUrl}/login/oauth2/callback/{registrationId}")
    .build()
----
======
=====


[[oauth2login-advanced-userinfo-endpoint]]
== UserInfo Endpoint

The UserInfo Endpoint includes a number of configuration options, as described in the following sub-sections:

* <<oauth2login-advanced-map-authorities>>
* <<oauth2login-advanced-oauth2-user-service>>
* <<oauth2login-advanced-oidc-user-service>>


[[oauth2login-advanced-map-authorities]]
=== Mapping User Authorities

After the user successfully authenticates with the OAuth 2.0 Provider, the `OAuth2User.getAuthorities()` (or `OidcUser.getAuthorities()`) contains a list of granted authorities populated from `OAuth2UserRequest.getAccessToken().getScopes()` and prefixed with `SCOPE_`.
These granted authorities can be mapped to a new set of `GrantedAuthority` instances, which are supplied to `OAuth2AuthenticationToken` when completing the authentication.

[TIP]
`OAuth2AuthenticationToken.getAuthorities()` is used for authorizing requests, such as in `hasRole('USER')` or `hasRole('ADMIN')`.

There are a couple of options to choose from when mapping user authorities:

* <<oauth2login-advanced-map-authorities-grantedauthoritiesmapper>>
* <<oauth2login-advanced-map-authorities-oauth2userservice>>


[[oauth2login-advanced-map-authorities-grantedauthoritiesmapper]]
==== Using a GrantedAuthoritiesMapper

The `GrantedAuthoritiesMapper` is given a list of granted authorities which contains a special authority of type `OAuth2UserAuthority` and the authority string `OAUTH2_USER` (or `OidcUserAuthority` and the authority string `OIDC_USER`).

Provide an implementation of `GrantedAuthoritiesMapper` and configure it, as follows:

.Granted Authorities Mapper Configuration
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

    @Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .userInfoEndpoint(userInfo -> userInfo
			        .userAuthoritiesMapper(this.userAuthoritiesMapper())
			        ...
			    )
			);
		return http.build();
	}

	private GrantedAuthoritiesMapper userAuthoritiesMapper() {
		return (authorities) -> {
			Set<GrantedAuthority> mappedAuthorities = new HashSet<>();

			authorities.forEach(authority -> {
				if (OidcUserAuthority.class.isInstance(authority)) {
					OidcUserAuthority oidcUserAuthority = (OidcUserAuthority)authority;

					OidcIdToken idToken = oidcUserAuthority.getIdToken();
					OidcUserInfo userInfo = oidcUserAuthority.getUserInfo();

					// Map the claims found in idToken and/or userInfo
					// to one or more GrantedAuthority's and add it to mappedAuthorities

				} else if (OAuth2UserAuthority.class.isInstance(authority)) {
					OAuth2UserAuthority oauth2UserAuthority = (OAuth2UserAuthority)authority;

					Map<String, Object> userAttributes = oauth2UserAuthority.getAttributes();

					// Map the attributes found in userAttributes
					// to one or more GrantedAuthority's and add it to mappedAuthorities

				}
			});

			return mappedAuthorities;
		};
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                userInfoEndpoint {
                    userAuthoritiesMapper = userAuthoritiesMapper()
                }
            }
        }
        return http.build()
    }

    private fun userAuthoritiesMapper(): GrantedAuthoritiesMapper = GrantedAuthoritiesMapper { authorities: Collection<GrantedAuthority> ->
        val mappedAuthorities = emptySet<GrantedAuthority>()

        authorities.forEach { authority ->
            if (authority is OidcUserAuthority) {
                val idToken = authority.idToken
                val userInfo = authority.userInfo
                // Map the claims found in idToken and/or userInfo
                // to one or more GrantedAuthority's and add it to mappedAuthorities
            } else if (authority is OAuth2UserAuthority) {
                val userAttributes = authority.attributes
                // Map the attributes found in userAttributes
                // to one or more GrantedAuthority's and add it to mappedAuthorities
            }
        }

        mappedAuthorities
    }
}
----

Xml::
+
[source,xml,role="secondary"]
----
<http>
	<oauth2-login user-authorities-mapper-ref="userAuthoritiesMapper"
				  ...
    />
</http>
----
======

Alternatively, you can register a `GrantedAuthoritiesMapper` `@Bean` to have it automatically applied to the configuration, as follows:

.Granted Authorities Mapper Bean Configuration
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
		    .oauth2Login(withDefaults());
		return http.build();
	}

	@Bean
	public GrantedAuthoritiesMapper userAuthoritiesMapper() {
		...
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login { }
        }
        return http.build()
    }

    @Bean
    fun userAuthoritiesMapper(): GrantedAuthoritiesMapper {
        ...
    }
}
----
======

[[oauth2login-advanced-map-authorities-oauth2userservice]]
==== Delegation-based Strategy with OAuth2UserService

This strategy is advanced compared to using a `GrantedAuthoritiesMapper`. However, it is also more flexible, as it gives you access to the `OAuth2UserRequest` and `OAuth2User` (when using an OAuth 2.0 UserService) or `OidcUserRequest` and `OidcUser` (when using an OpenID Connect 1.0 UserService).

The `OAuth2UserRequest` (and `OidcUserRequest`) provides you access to the associated `OAuth2AccessToken`, which is very useful in cases where the _delegator_ needs to fetch authority information from a protected resource before it can map the custom authorities for the user.

The following example shows how to implement and configure a delegation-based strategy using an OpenID Connect 1.0 UserService:

.OAuth2UserService Configuration
[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .userInfoEndpoint(userInfo -> userInfo
			        .oidcUserService(this.oidcUserService())
			        ...
			    )
			);
		return http.build();
	}

	private OAuth2UserService<OidcUserRequest, OidcUser> oidcUserService() {
		final OidcUserService delegate = new OidcUserService();

		return (userRequest) -> {
			// Delegate to the default implementation for loading a user
			OidcUser oidcUser = delegate.loadUser(userRequest);

			OAuth2AccessToken accessToken = userRequest.getAccessToken();
			Set<GrantedAuthority> mappedAuthorities = new HashSet<>();

			// TODO
			// 1) Fetch the authority information from the protected resource using accessToken
			// 2) Map the authority information to one or more GrantedAuthority's and add it to mappedAuthorities

			// 3) Create a copy of oidcUser but use the mappedAuthorities instead
			oidcUser = new DefaultOidcUser(mappedAuthorities, oidcUser.getIdToken(), oidcUser.getUserInfo());

			return oidcUser;
		};
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig  {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                userInfoEndpoint {
                    oidcUserService = oidcUserService()
                }
            }
        }
        return http.build()
    }

    @Bean
    fun oidcUserService(): OAuth2UserService<OidcUserRequest, OidcUser> {
        val delegate = OidcUserService()

        return OAuth2UserService { userRequest ->
            // Delegate to the default implementation for loading a user
            var oidcUser = delegate.loadUser(userRequest)

            val accessToken = userRequest.accessToken
            val mappedAuthorities = HashSet<GrantedAuthority>()

            // TODO
            // 1) Fetch the authority information from the protected resource using accessToken
            // 2) Map the authority information to one or more GrantedAuthority's and add it to mappedAuthorities
            // 3) Create a copy of oidcUser but use the mappedAuthorities instead
            oidcUser = DefaultOidcUser(mappedAuthorities, oidcUser.idToken, oidcUser.userInfo)

            oidcUser
        }
    }
}
----

Xml::
+
[source,xml,role="secondary"]
----
<http>
	<oauth2-login oidc-user-service-ref="oidcUserService"
				  ...
    />
</http>
----
======


[[oauth2login-advanced-oauth2-user-service]]
=== OAuth 2.0 UserService

`DefaultOAuth2UserService` is an implementation of an `OAuth2UserService` that supports standard OAuth 2.0 Provider's.

[NOTE]
====
`OAuth2UserService` obtains the user attributes of the end-user (the resource owner) from the UserInfo Endpoint (by using the access token granted to the client during the authorization flow) and returns an `AuthenticatedPrincipal` in the form of an `OAuth2User`.
====

`DefaultOAuth2UserService` uses a `RestOperations` instance when requesting the user attributes at the UserInfo Endpoint.

If you need to customize the pre-processing of the UserInfo Request, you can provide `DefaultOAuth2UserService.setRequestEntityConverter()` with a custom `Converter<OAuth2UserRequest, RequestEntity<?>>`.
The default implementation `OAuth2UserRequestEntityConverter` builds a `RequestEntity` representation of a UserInfo Request that sets the `OAuth2AccessToken` in the `Authorization` header by default.

On the other end, if you need to customize the post-handling of the UserInfo Response, you need to provide `DefaultOAuth2UserService.setRestOperations()` with a custom configured `RestOperations`.
The default `RestOperations` is configured as follows:

[source,java]
----
RestTemplate restTemplate = new RestTemplate();
restTemplate.setErrorHandler(new OAuth2ErrorResponseErrorHandler());
----

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

Whether you customize `DefaultOAuth2UserService` or provide your own implementation of `OAuth2UserService`, you need to configure it as follows:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
			    .userInfoEndpoint(userInfo -> userInfo
			        .userService(this.oauth2UserService())
			        ...
			    )
			);
		return http.build();
	}

	private OAuth2UserService<OAuth2UserRequest, OAuth2User> oauth2UserService() {
		...
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                userInfoEndpoint {
                    userService = oauth2UserService()
                    // ...
                }
            }
        }
        return http.build()
    }

    private fun oauth2UserService(): OAuth2UserService<OAuth2UserRequest, OAuth2User> {
        // ...
    }
}
----
======


[[oauth2login-advanced-oidc-user-service]]
=== OpenID Connect 1.0 UserService

`OidcUserService` is an implementation of an `OAuth2UserService` that supports OpenID Connect 1.0 Provider's.

The `OidcUserService` leverages the `DefaultOAuth2UserService` when requesting the user attributes at the UserInfo Endpoint.

If you need to customize the pre-processing of the UserInfo Request or the post-handling of the UserInfo Response, you need to provide `OidcUserService.setOauth2UserService()` with a custom configured `DefaultOAuth2UserService`.

Whether you customize `OidcUserService` or provide your own implementation of `OAuth2UserService` for OpenID Connect 1.0 Provider's, you need to configure it as follows:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class OAuth2LoginSecurityConfig {

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.oauth2Login(oauth2 -> oauth2
				.userInfoEndpoint(userInfo -> userInfo
				    .oidcUserService(this.oidcUserService())
				    ...
			    )
			);
		return http.build();
	}

	private OAuth2UserService<OidcUserRequest, OidcUser> oidcUserService() {
		...
	}
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class OAuth2LoginSecurityConfig {

    @Bean
    open fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http {
            oauth2Login {
                userInfoEndpoint {
                    oidcUserService = oidcUserService()
                    // ...
                }
            }
        }
        return http.build()
    }

    private fun oidcUserService(): OAuth2UserService<OidcUserRequest, OidcUser> {
        // ...
    }
}
----
======


[[oauth2login-advanced-idtoken-verify]]
== ID Token Signature Verification

OpenID Connect 1.0 Authentication introduces the https://openid.net/specs/openid-connect-core-1_0.html#IDToken[ID Token], which is a security token that contains Claims about the Authentication of an End-User by an Authorization Server when used by a Client.

The ID Token is represented as a https://tools.ietf.org/html/rfc7519[JSON Web Token] (JWT) and MUST be signed by using https://tools.ietf.org/html/rfc7515[JSON Web Signature] (JWS).

The `OidcIdTokenDecoderFactory` provides a `JwtDecoder` used for `OidcIdToken` signature verification. The default algorithm is `RS256` but may be different when assigned during client registration.
For these cases, you can configure a resolver to return the expected JWS algorithm assigned for a specific client.

The JWS algorithm resolver is a `Function` that accepts a `ClientRegistration` and returns the expected `JwsAlgorithm` for the client, such as `SignatureAlgorithm.RS256` or `MacAlgorithm.HS256`

The following code shows how to configure the `OidcIdTokenDecoderFactory` `@Bean` to default to `MacAlgorithm.HS256` for all `ClientRegistration` instances:

[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Bean
public JwtDecoderFactory<ClientRegistration> idTokenDecoderFactory() {
	OidcIdTokenDecoderFactory idTokenDecoderFactory = new OidcIdTokenDecoderFactory();
	idTokenDecoderFactory.setJwsAlgorithmResolver(clientRegistration -> MacAlgorithm.HS256);
	return idTokenDecoderFactory;
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Bean
fun idTokenDecoderFactory(): JwtDecoderFactory<ClientRegistration?> {
    val idTokenDecoderFactory = OidcIdTokenDecoderFactory()
    idTokenDecoderFactory.setJwsAlgorithmResolver { MacAlgorithm.HS256 }
    return idTokenDecoderFactory
}
----
======

[NOTE]
====
For MAC-based algorithms (such as `HS256`, `HS384`, or `HS512`), the `client-secret` that corresponds to the `client-id` is used as the symmetric key for signature verification.
====

[TIP]
====
If more than one `ClientRegistration` is configured for OpenID Connect 1.0 Authentication, the JWS algorithm resolver may evaluate the provided `ClientRegistration` to determine which algorithm to return.
====

[[oauth2login-advanced-oidc-logout]]
Then, you can proceed to configure xref:servlet/oauth2/login/logout.adoc[logout]
