Add auto-config for spring-security-oauth2-client

Closes gh-10497

spring-boot-samples/spring-boot-sample-oauth2-client/src/main/java/sample/oauth2/client/ExampleController.java

@@ -0,0 +1,19 @@
+package sample.oauth2.client;
+
+import java.security.Principal;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author Madhura Bhave
+ */
+@RestController
+public class ExampleController {
+
+	@RequestMapping("/")
+	public String email(Principal principal) {
+		return "Hello " + principal.getName();
+	}
+
+}

spring-boot-samples/spring-boot-sample-oauth2-client/src/main/java/sample/oauth2/client/SampleOAuth2ClientApplication.java

@@ -0,0 +1,16 @@
+package sample.oauth2.client;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author Madhura Bhave
+ */
+@SpringBootApplication
+public class SampleOAuth2ClientApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleOAuth2ClientApplication.class);
+	}
+
+}

spring-boot-samples/spring-boot-sample-oauth2-client/src/main/resources/application.yml

@@ -0,0 +1,19 @@
+spring:
+  security:
+    oauth2:
+      client:
+        registration:
+          github-client-1:
+            client-id: 1b4c6c2d23a2dbec8959
+            client-secret: 8bdb4047d98f37e1c6aeba9ffd2017bc31682e1b
+            client-name: Github user
+            provider: github
+            scope: user
+            redirect_uri: http://localhost:8080/oauth2/authorize/code/github
+          github-client-2:
+            client-id: 1b4c6c2d23a2dbec8959
+            client-secret: 8bdb4047d98f37e1c6aeba9ffd2017bc31682e1b
+            client-name: Github email
+            provider: github
+            scope: user:email
+            redirect_uri: http://localhost:8080/oauth2/authorize/code/github

spring-boot-samples/spring-boot-sample-oauth2-client/src/test/main/java/sample/oauth2/client/SampleOAuth2ClientApplicationTests.java

@@ -0,0 +1,51 @@
+package sample.oauth2.client;
+
+import java.net.URI;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for an OAuth2 client application.
+ *
+ * @author Madhura Bhave
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@DirtiesContext
+public class SampleOAuth2ClientApplicationTests {
+
+	@LocalServerPort
+	private int port;
+
+	@Autowired
+	private TestRestTemplate restTemplate;
+
+	@Test
+	public void everythingShouldRedirectToLogin() throws Exception {
+		ResponseEntity<String> entity = this.restTemplate.getForEntity("/", String.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.FOUND);
+		assertThat(entity.getHeaders().getLocation())
+				.isEqualTo(URI.create("http://localhost:" + this.port + "/login"));
+	}
+
+	@Test
+	public void loginShouldHaveBothOAuthClientsToChooseFrom() throws Exception {
+		ResponseEntity<String> entity = this.restTemplate.getForEntity("/login", String.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+		assertThat(entity.getBody()).contains("/oauth2/authorization/code/github-client-1");
+		assertThat(entity.getBody()).contains("/oauth2/authorization/code/github-client-2");
+	}
+
+}