Introduce Reactive OAuth2AuthorizedClient Manager/Provider

config/src/main/java/org/springframework/security/config/annotation/web/reactive/ReactiveOAuth2ClientImportSelector.java

@@ -20,11 +20,14 @@
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.ImportSelector;
 import org.springframework.core.type.AnnotationMetadata;
+import org.springframework.security.oauth2.client.ReactiveOAuth2AuthorizedClientProvider;
+import org.springframework.security.oauth2.client.ReactiveOAuth2AuthorizedClientProviderBuilder;
 import org.springframework.security.oauth2.client.ReactiveOAuth2AuthorizedClientService;
 import org.springframework.security.oauth2.client.registration.ReactiveClientRegistrationRepository;
+import org.springframework.security.oauth2.client.web.reactive.result.method.annotation.OAuth2AuthorizedClientArgumentResolver;
 import org.springframework.security.oauth2.client.web.server.AuthenticatedPrincipalServerOAuth2AuthorizedClientRepository;
+import org.springframework.security.oauth2.client.web.server.DefaultServerOAuth2AuthorizedClientManager;
 import org.springframework.security.oauth2.client.web.server.ServerOAuth2AuthorizedClientRepository;
-import org.springframework.security.oauth2.client.web.reactive.result.method.annotation.OAuth2AuthorizedClientArgumentResolver;
 import org.springframework.util.ClassUtils;
 import org.springframework.web.reactive.config.WebFluxConfigurer;
 import org.springframework.web.reactive.result.method.annotation.ArgumentResolverConfigurer;
@@ -63,7 +66,16 @@ static class OAuth2ClientWebFluxSecurityConfiguration implements WebFluxConfigur
 		@Override
 		public void configureArgumentResolvers(ArgumentResolverConfigurer configurer) {
 			if (this.authorizedClientRepository != null && this.clientRegistrationRepository != null) {
-				configurer.addCustomResolver(new OAuth2AuthorizedClientArgumentResolver(this.clientRegistrationRepository, getAuthorizedClientRepository()));
+				ReactiveOAuth2AuthorizedClientProvider authorizedClientProvider =
+						ReactiveOAuth2AuthorizedClientProviderBuilder.builder()
+								.authorizationCode()
+								.refreshToken()
+								.clientCredentials()
+								.build();
+				DefaultServerOAuth2AuthorizedClientManager authorizedClientManager = new DefaultServerOAuth2AuthorizedClientManager(
+						this.clientRegistrationRepository, getAuthorizedClientRepository());
+				authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);
+				configurer.addCustomResolver(new OAuth2AuthorizedClientArgumentResolver(authorizedClientManager));
 			}
 		}
 

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/AuthorizationCodeReactiveOAuth2AuthorizedClientProvider.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2002-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.security.oauth2.client;
+
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import org.springframework.util.Assert;
+import reactor.core.publisher.Mono;
+
+/**
+ * An implementation of a {@link ReactiveOAuth2AuthorizedClientProvider}
+ * for the {@link AuthorizationGrantType#AUTHORIZATION_CODE authorization_code} grant.
+ *
+ * @author Joe Grandja
+ * @since 5.2
+ * @see ReactiveOAuth2AuthorizedClientProvider
+ */
+public final class AuthorizationCodeReactiveOAuth2AuthorizedClientProvider implements ReactiveOAuth2AuthorizedClientProvider {
+
+	/**
+	 * Attempt to authorize the {@link OAuth2AuthorizationContext#getClientRegistration() client} in the provided {@code context}.
+	 * Returns an empty {@code Mono} if authorization is not supported,
+	 * e.g. the client's {@link ClientRegistration#getAuthorizationGrantType() authorization grant type}
+	 * is not {@link AuthorizationGrantType#AUTHORIZATION_CODE authorization_code} OR the client is already authorized.
+	 *
+	 * @param context the context that holds authorization-specific state for the client
+	 * @return the {@link OAuth2AuthorizedClient} or an empty {@code Mono} if authorization is not supported
+	 */
+	@Override
+	public Mono<OAuth2AuthorizedClient> authorize(OAuth2AuthorizationContext context) {
+		Assert.notNull(context, "context cannot be null");
+
+		if (AuthorizationGrantType.AUTHORIZATION_CODE.equals(context.getClientRegistration().getAuthorizationGrantType()) &&
+				context.getAuthorizedClient() == null) {
+			// ClientAuthorizationRequiredException is caught by OAuth2AuthorizationRequestRedirectWebFilter which initiates authorization
+			return Mono.error(() -> new ClientAuthorizationRequiredException(context.getClientRegistration().getRegistrationId()));
+		}
+		return Mono.empty();
+	}
+}

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/ClientCredentialsReactiveOAuth2AuthorizedClientProvider.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2002-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.security.oauth2.client;
+
+import org.springframework.security.oauth2.client.endpoint.OAuth2ClientCredentialsGrantRequest;
+import org.springframework.security.oauth2.client.endpoint.ReactiveOAuth2AccessTokenResponseClient;
+import org.springframework.security.oauth2.client.endpoint.WebClientReactiveClientCredentialsTokenResponseClient;
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.core.AbstractOAuth2Token;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import org.springframework.util.Assert;
+import reactor.core.publisher.Mono;
+
+import java.time.Duration;
+import java.time.Instant;
+
+/**
+ * An implementation of a {@link ReactiveOAuth2AuthorizedClientProvider}
+ * for the {@link AuthorizationGrantType#CLIENT_CREDENTIALS client_credentials} grant.
+ *
+ * @author Joe Grandja
+ * @since 5.2
+ * @see ReactiveOAuth2AuthorizedClientProvider
+ * @see WebClientReactiveClientCredentialsTokenResponseClient
+ */
+public final class ClientCredentialsReactiveOAuth2AuthorizedClientProvider implements ReactiveOAuth2AuthorizedClientProvider {
+	private ReactiveOAuth2AccessTokenResponseClient<OAuth2ClientCredentialsGrantRequest> accessTokenResponseClient =
+			new WebClientReactiveClientCredentialsTokenResponseClient();
+	private Duration clockSkew = Duration.ofSeconds(60);
+
+	/**
+	 * Attempt to authorize (or re-authorize) the {@link OAuth2AuthorizationContext#getClientRegistration() client} in the provided {@code context}.
+	 * Returns an empty {@code Mono} if authorization (or re-authorization) is not supported,
+	 * e.g. the client's {@link ClientRegistration#getAuthorizationGrantType() authorization grant type}
+	 * is not {@link AuthorizationGrantType#CLIENT_CREDENTIALS client_credentials} OR
+	 * the {@link OAuth2AuthorizedClient#getAccessToken() access token} is not expired.
+	 *
+	 * @param context the context that holds authorization-specific state for the client
+	 * @return the {@link OAuth2AuthorizedClient} or an empty {@code Mono} if authorization (or re-authorization) is not supported
+	 */
+	@Override
+	public Mono<OAuth2AuthorizedClient> authorize(OAuth2AuthorizationContext context) {
+		Assert.notNull(context, "context cannot be null");
+
+		ClientRegistration clientRegistration = context.getClientRegistration();
+		if (!AuthorizationGrantType.CLIENT_CREDENTIALS.equals(clientRegistration.getAuthorizationGrantType())) {
+			return Mono.empty();
+		}
+
+		OAuth2AuthorizedClient authorizedClient = context.getAuthorizedClient();
+		if (authorizedClient != null && !hasTokenExpired(authorizedClient.getAccessToken())) {
+			// If client is already authorized but access token is NOT expired than no need for re-authorization
+			return Mono.empty();
+		}
+
+		// As per spec, in section 4.4.3 Access Token Response
+		// https://tools.ietf.org/html/rfc6749#section-4.4.3
+		// A refresh token SHOULD NOT be included.
+		//
+		// Therefore, renewing an expired access token (re-authorization)
+		// is the same as acquiring a new access token (authorization).
+
+		return Mono.just(new OAuth2ClientCredentialsGrantRequest(clientRegistration))
+				.flatMap(this.accessTokenResponseClient::getTokenResponse)
+				.map(tokenResponse -> new OAuth2AuthorizedClient(
+						clientRegistration, context.getPrincipal().getName(), tokenResponse.getAccessToken()));
+	}
+
+	private boolean hasTokenExpired(AbstractOAuth2Token token) {
+		return token.getExpiresAt().isBefore(Instant.now().minus(this.clockSkew));
+	}
+
+	/**
+	 * Sets the client used when requesting an access token credential at the Token Endpoint for the {@code client_credentials} grant.
+	 *
+	 * @param accessTokenResponseClient the client used when requesting an access token credential at the Token Endpoint for the {@code client_credentials} grant
+	 */
+	public void setAccessTokenResponseClient(ReactiveOAuth2AccessTokenResponseClient<OAuth2ClientCredentialsGrantRequest> accessTokenResponseClient) {
+		Assert.notNull(accessTokenResponseClient, "accessTokenResponseClient cannot be null");
+		this.accessTokenResponseClient = accessTokenResponseClient;
+	}
+
+	/**
+	 * Sets the maximum acceptable clock skew, which is used when checking the
+	 * {@link OAuth2AuthorizedClient#getAccessToken() access token} expiry. The default is 60 seconds.
+	 * An access token is considered expired if it's before {@code Instant.now() - clockSkew}.
+	 *
+	 * @param clockSkew the maximum acceptable clock skew
+	 */
+	public void setClockSkew(Duration clockSkew) {
+		Assert.notNull(clockSkew, "clockSkew cannot be null");
+		Assert.isTrue(clockSkew.getSeconds() >= 0, "clockSkew must be >= 0");
+		this.clockSkew = clockSkew;
+	}
+}

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/DelegatingReactiveOAuth2AuthorizedClientProvider.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2002-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.security.oauth2.client;
+
+import org.springframework.util.Assert;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * An implementation of a {@link ReactiveOAuth2AuthorizedClientProvider} that simply delegates
+ * to it's internal {@code List} of {@link ReactiveOAuth2AuthorizedClientProvider}(s).
+ * <p>
+ * Each provider is given a chance to
+ * {@link ReactiveOAuth2AuthorizedClientProvider#authorize(OAuth2AuthorizationContext) authorize}
+ * the {@link OAuth2AuthorizationContext#getClientRegistration() client} in the provided context
+ * with the first available {@link OAuth2AuthorizedClient} being returned.
+ *
+ * @author Joe Grandja
+ * @since 5.2
+ * @see ReactiveOAuth2AuthorizedClientProvider
+ */
+public final class DelegatingReactiveOAuth2AuthorizedClientProvider implements ReactiveOAuth2AuthorizedClientProvider {
+	private final List<ReactiveOAuth2AuthorizedClientProvider> authorizedClientProviders;
+
+	/**
+	 * Constructs a {@code DelegatingReactiveOAuth2AuthorizedClientProvider} using the provided parameters.
+	 *
+	 * @param authorizedClientProviders a list of {@link ReactiveOAuth2AuthorizedClientProvider}(s)
+	 */
+	public DelegatingReactiveOAuth2AuthorizedClientProvider(ReactiveOAuth2AuthorizedClientProvider... authorizedClientProviders) {
+		Assert.notEmpty(authorizedClientProviders, "authorizedClientProviders cannot be empty");
+		this.authorizedClientProviders = Collections.unmodifiableList(Arrays.asList(authorizedClientProviders));
+	}
+
+	/**
+	 * Constructs a {@code DelegatingReactiveOAuth2AuthorizedClientProvider} using the provided parameters.
+	 *
+	 * @param authorizedClientProviders a {@code List} of {@link OAuth2AuthorizedClientProvider}(s)
+	 */
+	public DelegatingReactiveOAuth2AuthorizedClientProvider(List<ReactiveOAuth2AuthorizedClientProvider> authorizedClientProviders) {
+		Assert.notEmpty(authorizedClientProviders, "authorizedClientProviders cannot be empty");
+		this.authorizedClientProviders = Collections.unmodifiableList(new ArrayList<>(authorizedClientProviders));
+	}
+
+	@Override
+	public Mono<OAuth2AuthorizedClient> authorize(OAuth2AuthorizationContext context) {
+		Assert.notNull(context, "context cannot be null");
+		return Flux.fromIterable(this.authorizedClientProviders)
+				.concatMap(authorizedClientProvider -> authorizedClientProvider.authorize(context))
+				.next();
+	}
+}

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/ReactiveOAuth2AuthorizedClientProvider.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2002-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.security.oauth2.client;
+
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import reactor.core.publisher.Mono;
+
+/**
+ * A strategy for authorizing (or re-authorizing) an OAuth 2.0 Client.
+ * Implementations will typically implement a specific {@link AuthorizationGrantType authorization grant} type.
+ *
+ * @author Joe Grandja
+ * @since 5.2
+ * @see OAuth2AuthorizedClient
+ * @see OAuth2AuthorizationContext
+ * @see <a target="_blank" href="https://tools.ietf.org/html/rfc6749#section-1.3">Section 1.3 Authorization Grant</a>
+ */
+public interface ReactiveOAuth2AuthorizedClientProvider {
+
+	/**
+	 * Attempt to authorize (or re-authorize) the {@link OAuth2AuthorizationContext#getClientRegistration() client} in the provided context.
+	 * Implementations must return an empty {@code Mono} if authorization is not supported for the specified client,
+	 * e.g. the provider doesn't support the {@link ClientRegistration#getAuthorizationGrantType() authorization grant} type configured for the client.
+	 *
+	 * @param context the context that holds authorization-specific state for the client
+	 * @return the {@link OAuth2AuthorizedClient} or an empty {@code Mono} if authorization is not supported for the specified client
+	 */
+	Mono<OAuth2AuthorizedClient> authorize(OAuth2AuthorizationContext context);
+
+}