Reactive Implementation of AuthorizedClientServiceOAuth2AuthorizedCli…

…entManager

ReactiveOAuth2AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager is reactive
version of AuthorizedClientServiceOAuth2AuthorizedClientManager

Fixes: spring-projectsgh-7569

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/OAuth2AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager.java

@@ -0,0 +1,147 @@
+/*
+ * 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.lang.Nullable;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.oauth2.client.registration.ReactiveClientRegistrationRepository;
+import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
+import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
+import org.springframework.util.StringUtils;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Function;
+
+/**
+ * An implementation of an {@link ReactiveOAuth2AuthorizedClientManager}
+ * that is capable of operating outside of a {@code ServerHttpRequest} context,
+ * e.g. in a scheduled/background thread and/or in the service-tier.
+ *
+ * @author Ankur Pathak
+ * @see ReactiveOAuth2AuthorizedClientManager
+ * @see ReactiveOAuth2AuthorizedClientProvider
+ * @see ReactiveOAuth2AuthorizedClientService
+ * @since 5.3
+ */
+public final class OAuth2AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager implements ReactiveOAuth2AuthorizedClientManager {
+	private final ReactiveClientRegistrationRepository clientRegistrationRepository;
+	private final ReactiveOAuth2AuthorizedClientService authorizedClientService;
+	private ReactiveOAuth2AuthorizedClientProvider authorizedClientProvider = context -> Mono.empty();
+	private Function<OAuth2AuthorizeRequest, Mono<Map<String, Object>>> contextAttributesMapper = new DefaultContextAttributesMapper();
+
+	/**
+	 * Constructs an {@code OAuth2AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager} using the provided parameters.
+	 *
+	 * @param clientRegistrationRepository the repository of client registrations
+	 * @param authorizedClientService      the authorized client service
+	 */
+	public OAuth2AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager(ReactiveClientRegistrationRepository clientRegistrationRepository,
+			ReactiveOAuth2AuthorizedClientService authorizedClientService) {
+		Assert.notNull(clientRegistrationRepository, "clientRegistrationRepository cannot be null");
+		Assert.notNull(authorizedClientService, "authorizedClientService cannot be null");
+		this.clientRegistrationRepository = clientRegistrationRepository;
+		this.authorizedClientService = authorizedClientService;
+	}
+
+	@Nullable
+	@Override
+	public Mono<OAuth2AuthorizedClient> authorize(OAuth2AuthorizeRequest authorizeRequest) {
+		Assert.notNull(authorizeRequest, "authorizeRequest cannot be null");
+		String clientRegistrationId = authorizeRequest.getClientRegistrationId();
+		OAuth2AuthorizedClient authorizedClient = authorizeRequest.getAuthorizedClient();
+		Authentication principal = authorizeRequest.getPrincipal();
+		// @formatter:off
+		return Mono.justOrEmpty(authorizedClient)
+				.map(OAuth2AuthorizationContext::withAuthorizedClient)
+				.switchIfEmpty(Mono.defer(() -> this.clientRegistrationRepository.findByRegistrationId(clientRegistrationId)
+								.flatMap(clientRegistration -> this.authorizedClientService.loadAuthorizedClient(clientRegistrationId, principal.getName())
+										.map(OAuth2AuthorizationContext::withAuthorizedClient)
+										.switchIfEmpty(Mono.fromSupplier(() -> OAuth2AuthorizationContext.withClientRegistration(clientRegistration)))
+								)
+								.switchIfEmpty(Mono.error(new IllegalArgumentException("Could not find ClientRegistration with id '" + clientRegistrationId + "'")))
+							)
+				)
+				.flatMap(contextBuilder -> this.contextAttributesMapper.apply(authorizeRequest)
+						.filter(contextAttributes-> !CollectionUtils.isEmpty(contextAttributes))
+						.map(contextAttributes -> contextBuilder.principal(principal)
+								.attributes(attributes -> {
+									attributes.putAll(contextAttributes);
+								}).build())
+				).flatMap(authorizationContext -> this.authorizedClientProvider.authorize(authorizationContext)
+						.doOnNext(_authorizedClient -> authorizedClientService.saveAuthorizedClient(_authorizedClient, principal))
+						.switchIfEmpty(Mono.defer(()-> Mono.justOrEmpty(Optional.ofNullable(authorizationContext.getAuthorizedClient()))))
+				);
+		// @formatter:on
+	}
+
+	/**
+	 * Sets the {@link ReactiveOAuth2AuthorizedClientProvider} used for authorizing (or re-authorizing) an OAuth 2.0 Client.
+	 *
+	 * @param authorizedClientProvider the {@link ReactiveOAuth2AuthorizedClientProvider} used for authorizing (or re-authorizing) an OAuth 2.0 Client
+	 */
+	public void setAuthorizedClientProvider(ReactiveOAuth2AuthorizedClientProvider authorizedClientProvider) {
+		Assert.notNull(authorizedClientProvider, "authorizedClientProvider cannot be null");
+		this.authorizedClientProvider = authorizedClientProvider;
+	}
+
+	/**
+	 * Sets the {@code Function} used for mapping attribute(s) from the {@link OAuth2AuthorizeRequest} to a {@code Map} of attributes
+	 * to be associated to the {@link OAuth2AuthorizationContext#getAttributes() authorization context}.
+	 *
+	 * @param contextAttributesMapper the {@code Function} used for supplying the {@code Map} of attributes
+	 *                                to the {@link OAuth2AuthorizationContext#getAttributes() authorization context}
+	 */
+	public void setContextAttributesMapper(Function<OAuth2AuthorizeRequest, Mono<Map<String, Object>>> contextAttributesMapper) {
+		Assert.notNull(contextAttributesMapper, "contextAttributesMapper cannot be null");
+		this.contextAttributesMapper = contextAttributesMapper;
+	}
+
+	private static Mono<ServerWebExchange> currentServerWebExchange() {
+		return Mono.subscriberContext()
+				.filter(c -> c.hasKey(ServerWebExchange.class))
+				.map(c -> c.get(ServerWebExchange.class));
+	}
+
+	/**
+	 * The default implementation of the {@link #setContextAttributesMapper(Function) contextAttributesMapper}.
+	 */
+	public static class DefaultContextAttributesMapper implements Function<OAuth2AuthorizeRequest, Mono<Map<String, Object>>> {
+
+		@Override
+		public Mono<Map<String, Object>> apply(OAuth2AuthorizeRequest authorizeRequest) {
+			ServerWebExchange serverWebExchange = authorizeRequest.getAttribute(ServerWebExchange.class.getName());
+			return Mono.justOrEmpty(serverWebExchange)
+					.switchIfEmpty(Mono.defer(() -> currentServerWebExchange()))
+					.flatMap(exchange -> {
+						Map<String, Object> contextAttributes = Collections.emptyMap();
+						String scope = exchange.getRequest().getQueryParams().getFirst(OAuth2ParameterNames.SCOPE);
+						if (StringUtils.hasText(scope)) {
+							contextAttributes = new HashMap<>();
+							contextAttributes.put(OAuth2AuthorizationContext.REQUEST_SCOPE_ATTRIBUTE_NAME,
+									StringUtils.delimitedListToStringArray(scope, " "));
+						}
+						return Mono.just(contextAttributes);
+					})
+					.defaultIfEmpty(Collections.emptyMap());
+		}
+	}
+}