Add authcodegrant-webflux sample

Issue: gh-5620

samples/boot/authcodegrant-webflux/src/integration-test/java/sample/OAuth2AuthorizationCodeGrantApplicationTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2002-2018 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 sample;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.HttpHeaders;
+import org.springframework.security.oauth2.client.web.OAuth2AuthorizationCodeGrantFilter;
+import org.springframework.security.oauth2.client.web.OAuth2AuthorizationRequestRedirectFilter;
+import org.springframework.security.test.context.support.WithMockUser;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+/**
+ * Integration tests for the OAuth 2.0 client filters {@link OAuth2AuthorizationRequestRedirectFilter}
+ * and {@link OAuth2AuthorizationCodeGrantFilter}. These filters work together to realize
+ * the OAuth 2.0 Authorization Code Grant flow.
+ *
+ * @author Joe Grandja
+ * @since 5.1
+ */
+@SpringBootTest
+@ActiveProfiles("test")
+@AutoConfigureWebTestClient
+@RunWith(SpringRunner.class)
+public class OAuth2AuthorizationCodeGrantApplicationTests {
+	@Autowired
+	private WebTestClient rest;
+
+	@Test
+	@WithMockUser
+	public void requestWhenClientNotAuthorizedThenRedirectForAuthorization() throws Exception {
+		this.rest.get()
+			.uri("http://localhost/repos")
+			.exchange()
+			.expectStatus().is3xxRedirection()
+			.expectHeader().valueMatches(HttpHeaders.LOCATION, "https://github.com/login/oauth/authorize\\?response_type=code&client_id=client-id&scope=public_repo&state=.{15,}&redirect_uri=http%3A%2F%2Flocalhost%2Fauthorize%2Foauth2%2Fcode%2Fgithub");
+	}
+
+}

samples/boot/authcodegrant-webflux/src/integration-test/resources/application-test.yml

@@ -0,0 +1,20 @@
+logging:
+  level:
+    root: INFO
+    org.springframework.web: INFO
+    org.springframework.security: INFO
+#    org.springframework.boot.autoconfigure: DEBUG
+
+spring:
+  thymeleaf:
+    cache: false
+  security:
+    oauth2:
+      client:
+        registration:
+          github:
+            client-id: client-id
+            client-secret: client-secret
+            scope: public_repo
+            redirect-uri-template: "{baseUrl}/authorize/oauth2/code/github"
+            client-name: GitHub Repositories