Refactor AuthenticationManagerConfiguration to make sure it works

if user also adds @EnableWebMvcSecurity. The problem is that the ordering
of the init() and configure() methods in the Spring Security configurers
can force things to happen too early unless we are careful. It's still a bit
twitchy I would say, but this relatively small change seems to fix the GS guide
and not break any existing tests.

I added a sample which mimic ths GS guide so we get an integration test that
executes the new code paths.

Fixes gh-1364

spring-boot-samples/spring-boot-sample-web-secure-custom/src/test/java/sample/ui/secure/SampleWebSecureCustomApplicationTests.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright 2012-2014 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.ui.secure;
+
+import java.util.Arrays;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.IntegrationTest;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Basic integration tests for demo application.
+ *
+ * @author Dave Syer
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = SampleWebSecureCustomApplication.class)
+@WebAppConfiguration
+@IntegrationTest("server.port:0")
+@DirtiesContext
+public class SampleWebSecureCustomApplicationTests {
+
+	@Value("${local.server.port}")
+	private int port;
+
+	@Test
+	public void testHome() throws Exception {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setAccept(Arrays.asList(MediaType.TEXT_HTML));
+		ResponseEntity<String> entity = new TestRestTemplate().exchange(
+				"http://localhost:" + this.port, HttpMethod.GET, new HttpEntity<Void>(
+						headers), String.class);
+		assertEquals(HttpStatus.FOUND, entity.getStatusCode());
+		assertTrue("Wrong location:\n" + entity.getHeaders(), entity.getHeaders()
+				.getLocation().toString().endsWith(port + "/login"));
+	}
+
+	@Test
+	public void testLoginPage() throws Exception {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setAccept(Arrays.asList(MediaType.TEXT_HTML));
+		ResponseEntity<String> entity = new TestRestTemplate().exchange(
+				"http://localhost:" + this.port + "/login", HttpMethod.GET,
+				new HttpEntity<Void>(headers), String.class);
+		assertEquals(HttpStatus.OK, entity.getStatusCode());
+		assertTrue("Wrong content:\n" + entity.getBody(),
+				entity.getBody().contains("_csrf"));
+	}
+
+	@Test
+	public void testLogin() throws Exception {
+		HttpHeaders headers = getHeaders();
+		headers.setAccept(Arrays.asList(MediaType.TEXT_HTML));
+		headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
+		MultiValueMap<String, String> form = new LinkedMultiValueMap<String, String>();
+		form.set("username", "user");
+		form.set("password", "user");
+		ResponseEntity<String> entity = new TestRestTemplate().exchange(
+				"http://localhost:" + this.port + "/login", HttpMethod.POST,
+				new HttpEntity<MultiValueMap<String, String>>(form, headers),
+				String.class);
+		assertEquals(HttpStatus.FOUND, entity.getStatusCode());
+		assertTrue("Wrong location:\n" + entity.getHeaders(), entity.getHeaders()
+				.getLocation().toString().endsWith(port + "/"));
+		assertNotNull("Missing cookie:\n" + entity.getHeaders(),
+				entity.getHeaders().get("Set-Cookie"));
+	}
+
+	private HttpHeaders getHeaders() {
+		HttpHeaders headers = new HttpHeaders();
+		ResponseEntity<String> page = new TestRestTemplate().getForEntity(
+				"http://localhost:" + this.port + "/login", String.class);
+		assertEquals(HttpStatus.OK, page.getStatusCode());
+		String cookie = page.getHeaders().getFirst("Set-Cookie");
+		headers.set("Cookie", cookie);
+		Matcher matcher = Pattern.compile("(?s).*name=\"_csrf\".*?value=\"([^\"]+).*")
+				.matcher(page.getBody());
+		assertTrue("No csrf token: " + page.getBody(), matcher.matches());
+		headers.set("X-CSRF-TOKEN", matcher.group(1));
+		return headers;
+	}
+
+	@Test
+	public void testCss() throws Exception {
+		ResponseEntity<String> entity = new TestRestTemplate().getForEntity(
+				"http://localhost:" + this.port + "/css/bootstrap.min.css", String.class);
+		assertEquals(HttpStatus.OK, entity.getStatusCode());
+		assertTrue("Wrong body:\n" + entity.getBody(), entity.getBody().contains("body"));
+	}
+
+}