Add WebFlux

Fixes gh-4128

webflux/src/integration-test/java/webclient/oauth2/poc/WebClientOAuth2PocTests.java

@@ -0,0 +1,103 @@
+/*
+ *
+ *  * Copyright 2002-2017 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
+ *  *
+ *  *	  http://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 webclient.oauth2.poc;
+
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.reactive.function.client.ClientRequest;
+import org.springframework.web.reactive.function.client.ClientResponse;
+import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
+import org.springframework.web.reactive.function.client.WebClient;
+import reactor.core.publisher.Mono;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.web.reactive.function.client.ExchangeFilterFunctions.basicAuthentication;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+public class WebClientOAuth2PocTests {
+
+	private MockWebServer server;
+
+	private WebClient webClient;
+
+
+	@Before
+	public void setup() {
+		this.server = new MockWebServer();
+		String baseUrl = this.server.url("/").toString();
+		this.webClient = WebClient.create(baseUrl);
+	}
+
+	@After
+	public void shutdown() throws Exception {
+		this.server.shutdown();
+	}
+
+	@Test
+	public void httpBasicWhenNeeded() throws Exception {
+		this.server.enqueue(new MockResponse().setResponseCode(401).setHeader("WWW-Authenticate", "Basic realm=\"Test\""));
+		this.server.enqueue(new MockResponse().setResponseCode(200).setBody("OK"));
+
+		ClientResponse response = this.webClient
+			.filter(basicIfNeeded("rob", "rob"))
+			.get()
+			.uri("/")
+			.exchange()
+			.block();
+
+		assertThat(response.statusCode()).isEqualTo(HttpStatus.OK);
+
+		assertThat(this.server.takeRequest().getHeader("Authorization")).isNull();
+		assertThat(this.server.takeRequest().getHeader("Authorization")).isEqualTo("Basic cm9iOnJvYg==");
+	}
+
+
+	@Test
+	public void httpBasicWhenNotNeeded() throws Exception {
+		this.server.enqueue(new MockResponse().setResponseCode(200).setBody("OK"));
+
+		ClientResponse response = this.webClient
+			.filter(basicIfNeeded("rob", "rob"))
+			.get()
+			.uri("/")
+			.exchange()
+			.block();
+
+		assertThat(response.statusCode()).isEqualTo(HttpStatus.OK);
+
+		assertThat(this.server.getRequestCount()).isEqualTo(1);
+		assertThat(this.server.takeRequest().getHeader("Authorization")).isNull();
+	}
+
+	private ExchangeFilterFunction basicIfNeeded(String username, String password) {
+		return (request, next) ->
+			next.exchange(request)
+				.filter( r -> !HttpStatus.UNAUTHORIZED.equals(r.statusCode()))
+				.switchIfEmpty( Mono.defer(() -> {
+					return basicAuthentication(username, password).filter(request, next);
+				}));
+	}
+}