Return device_code grant metadata when enabled

Issue gh-17998

config/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/server/authorization/OAuth2AuthorizationServerConfigurer.java

@@ -38,6 +38,7 @@ import org.springframework.security.context.DelegatingApplicationListener;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.session.SessionRegistry;
 import org.springframework.security.core.session.SessionRegistryImpl;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.security.oauth2.core.OAuth2Error;
 import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
 import org.springframework.security.oauth2.core.OAuth2Token;
@@ -459,6 +460,28 @@ public final class OAuth2AuthorizationServerConfigurer
 			});
 		}
 
+		OAuth2DeviceAuthorizationEndpointConfigurer deviceAuthorizationEndpointConfigurer = getConfigurer(
+				OAuth2DeviceAuthorizationEndpointConfigurer.class);
+		if (deviceAuthorizationEndpointConfigurer != null) {
+			OAuth2AuthorizationServerMetadataEndpointConfigurer authorizationServerMetadataEndpointConfigurer = getConfigurer(
+					OAuth2AuthorizationServerMetadataEndpointConfigurer.class);
+
+			authorizationServerMetadataEndpointConfigurer.addDefaultAuthorizationServerMetadataCustomizer((builder) -> {
+				AuthorizationServerContext authorizationServerContext = AuthorizationServerContextHolder.getContext();
+				String issuer = authorizationServerContext.getIssuer();
+				AuthorizationServerSettings authorizationServerSettings = authorizationServerContext
+					.getAuthorizationServerSettings();
+
+				String deviceAuthorizationEndpoint = UriComponentsBuilder.fromUriString(issuer)
+					.path(authorizationServerSettings.getDeviceAuthorizationEndpoint())
+					.build()
+					.toUriString();
+
+				builder.deviceAuthorizationEndpoint(deviceAuthorizationEndpoint);
+				builder.grantType(AuthorizationGrantType.DEVICE_CODE.getValue());
+			});
+		}
+
 		this.configurers.values().forEach((configurer) -> configurer.configure(httpSecurity));
 
 		AuthorizationServerSettings authorizationServerSettings = OAuth2ConfigurerUtils
@@ -501,7 +524,7 @@ public final class OAuth2AuthorizationServerConfigurer
 	}
 
 	@SuppressWarnings("unchecked")
-	private <T> T getConfigurer(Class<T> type) {
+	<T> T getConfigurer(Class<T> type) {
 		return (T) this.configurers.get(type);
 	}
 

config/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/server/authorization/OidcConfigurer.java

@@ -24,6 +24,7 @@ import java.util.Map;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.ObjectPostProcessor;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.security.oauth2.server.authorization.context.AuthorizationServerContext;
 import org.springframework.security.oauth2.server.authorization.context.AuthorizationServerContextHolder;
 import org.springframework.security.oauth2.server.authorization.settings.AuthorizationServerSettings;
@@ -147,6 +148,29 @@ public final class OidcConfigurer extends AbstractOAuth2Configurer {
 			});
 		}
 
+		OAuth2DeviceAuthorizationEndpointConfigurer deviceAuthorizationEndpointConfigurer = httpSecurity
+			.getConfigurer(OAuth2AuthorizationServerConfigurer.class)
+			.getConfigurer(OAuth2DeviceAuthorizationEndpointConfigurer.class);
+		if (deviceAuthorizationEndpointConfigurer != null) {
+			OidcProviderConfigurationEndpointConfigurer providerConfigurationEndpointConfigurer = getConfigurer(
+					OidcProviderConfigurationEndpointConfigurer.class);
+
+			providerConfigurationEndpointConfigurer.addDefaultProviderConfigurationCustomizer((builder) -> {
+				AuthorizationServerContext authorizationServerContext = AuthorizationServerContextHolder.getContext();
+				String issuer = authorizationServerContext.getIssuer();
+				AuthorizationServerSettings authorizationServerSettings = authorizationServerContext
+					.getAuthorizationServerSettings();
+
+				String deviceAuthorizationEndpoint = UriComponentsBuilder.fromUriString(issuer)
+					.path(authorizationServerSettings.getDeviceAuthorizationEndpoint())
+					.build()
+					.toUriString();
+
+				builder.deviceAuthorizationEndpoint(deviceAuthorizationEndpoint);
+				builder.grantType(AuthorizationGrantType.DEVICE_CODE.getValue());
+			});
+		}
+
 		this.configurers.values().forEach((configurer) -> configurer.configure(httpSecurity));
 	}
 

config/src/test/java/org/springframework/security/config/annotation/web/configurers/oauth2/server/authorization/OAuth2AuthorizationServerMetadataTests.java

@@ -42,6 +42,7 @@ import org.springframework.security.config.annotation.web.configuration.EnableWe
 import org.springframework.security.config.annotation.web.configuration.OAuth2AuthorizationServerConfiguration;
 import org.springframework.security.config.test.SpringTestContext;
 import org.springframework.security.config.test.SpringTestContextExtension;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.security.oauth2.jose.TestJwks;
 import org.springframework.security.oauth2.jwt.JwtDecoder;
 import org.springframework.security.oauth2.server.authorization.OAuth2AuthorizationServerMetadata;
@@ -172,6 +173,18 @@ public class OAuth2AuthorizationServerMetadataTests {
 				.value(ISSUER.concat(this.authorizationServerSettings.getClientRegistrationEndpoint())));
 	}
 
+	@Test
+	public void requestWhenAuthorizationServerMetadataRequestAndDeviceCodeGrantEnabledThenMetadataResponseIncludesDeviceAuthorizationEndpoint()
+			throws Exception {
+		this.spring.register(AuthorizationServerConfigurationWithDeviceCodeGrantEnabled.class).autowire();
+
+		this.mvc.perform(get(ISSUER.concat(DEFAULT_OAUTH2_AUTHORIZATION_SERVER_METADATA_ENDPOINT_URI)))
+			.andExpect(status().is2xxSuccessful())
+			.andExpect(jsonPath("$.device_authorization_endpoint")
+				.value(ISSUER.concat(this.authorizationServerSettings.getDeviceAuthorizationEndpoint())))
+			.andExpect(jsonPath("$.grant_types_supported[4]").value(AuthorizationGrantType.DEVICE_CODE.getValue()));
+	}
+
 	@EnableWebSecurity
 	@Import(OAuth2AuthorizationServerConfiguration.class)
 	static class AuthorizationServerConfiguration {
@@ -267,4 +280,25 @@ public class OAuth2AuthorizationServerMetadataTests {
 
 	}
 
+	@EnableWebSecurity
+	@Configuration(proxyBeanMethods = false)
+	static class AuthorizationServerConfigurationWithDeviceCodeGrantEnabled extends AuthorizationServerConfiguration {
+
+		// @formatter:off
+		@Bean
+		SecurityFilterChain authorizationServerSecurityFilterChain(HttpSecurity http) throws Exception {
+			http
+					.oauth2AuthorizationServer((authorizationServer) ->
+							authorizationServer
+									.deviceAuthorizationEndpoint(Customizer.withDefaults())
+					)
+					.authorizeHttpRequests((authorize) ->
+							authorize.anyRequest().authenticated()
+					);
+			return http.build();
+		}
+		// @formatter:on
+
+	}
+
 }

config/src/test/java/org/springframework/security/config/annotation/web/configurers/oauth2/server/authorization/OAuth2DeviceCodeGrantTests.java

@@ -657,7 +657,6 @@ public class OAuth2DeviceCodeGrantTests {
 					.oauth2AuthorizationServer((authorizationServer) ->
 							authorizationServer
 									.deviceAuthorizationEndpoint(Customizer.withDefaults())
-									.deviceVerificationEndpoint(Customizer.withDefaults())
 					)
 					.authorizeHttpRequests((authorize) ->
 							authorize.anyRequest().authenticated()

config/src/test/java/org/springframework/security/config/annotation/web/configurers/oauth2/server/authorization/OidcProviderConfigurationTests.java

@@ -146,6 +146,19 @@ public class OidcProviderConfigurationTests {
 				.value(ISSUER.concat(this.authorizationServerSettings.getOidcClientRegistrationEndpoint())));
 	}
 
+	@Test
+	public void requestWhenConfigurationRequestAndDeviceCodeGrantEnabledThenConfigurationResponseIncludesDeviceAuthorizationEndpoint()
+			throws Exception {
+		this.spring.register(AuthorizationServerConfigurationWithDeviceCodeGrantEnabled.class).autowire();
+
+		this.mvc.perform(get(ISSUER.concat(DEFAULT_OIDC_PROVIDER_CONFIGURATION_ENDPOINT_URI)))
+			.andExpect(status().is2xxSuccessful())
+			.andExpectAll(defaultConfigurationMatchers(ISSUER))
+			.andExpect(jsonPath("$.device_authorization_endpoint")
+				.value(ISSUER.concat(this.authorizationServerSettings.getDeviceAuthorizationEndpoint())))
+			.andExpect(jsonPath("$.grant_types_supported[4]").value(AuthorizationGrantType.DEVICE_CODE.getValue()));
+	}
+
 	private ResultMatcher[] defaultConfigurationMatchers(String issuer) {
 		// @formatter:off
 		return new ResultMatcher[] {
@@ -163,6 +176,7 @@ public class OidcProviderConfigurationTests {
 				jsonPath("$.grant_types_supported[0]").value(AuthorizationGrantType.AUTHORIZATION_CODE.getValue()),
 				jsonPath("$.grant_types_supported[1]").value(AuthorizationGrantType.CLIENT_CREDENTIALS.getValue()),
 				jsonPath("$.grant_types_supported[2]").value(AuthorizationGrantType.REFRESH_TOKEN.getValue()),
+				jsonPath("$.grant_types_supported[3]").value(AuthorizationGrantType.TOKEN_EXCHANGE.getValue()),
 				jsonPath("revocation_endpoint").value(issuer.concat(this.authorizationServerSettings.getTokenRevocationEndpoint())),
 				jsonPath("$.revocation_endpoint_auth_methods_supported[0]").value(ClientAuthenticationMethod.CLIENT_SECRET_BASIC.getValue()),
 				jsonPath("$.revocation_endpoint_auth_methods_supported[1]").value(ClientAuthenticationMethod.CLIENT_SECRET_POST.getValue()),
@@ -324,6 +338,25 @@ public class OidcProviderConfigurationTests {
 
 	}
 
+	@EnableWebSecurity
+	@Configuration(proxyBeanMethods = false)
+	static class AuthorizationServerConfigurationWithDeviceCodeGrantEnabled extends AuthorizationServerConfiguration {
+
+		// @formatter:off
+		@Bean
+		SecurityFilterChain authorizationServerSecurityFilterChain(HttpSecurity http) throws Exception {
+			http
+					.oauth2AuthorizationServer((authorizationServer) ->
+							authorizationServer
+									.deviceAuthorizationEndpoint(Customizer.withDefaults())
+									.oidc(Customizer.withDefaults())
+					);
+			return http.build();
+		}
+		// @formatter:on
+
+	}
+
 	@EnableWebSecurity
 	@Configuration(proxyBeanMethods = false)
 	static class AuthorizationServerConfigurationWithInvalidIssuerUrl extends AuthorizationServerConfiguration {