Find by Username Sample switch from DELETE to POST

Spring Boot 2.2 no longer adds HiddenHttpMethodFilter by default See
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.2-Release-Notes#httphiddenmethodfilter-disabled-by-default
This means that trying to map DELETE requests using _method variable
does not work.

This changes the mapping to use a POST which doesn't require the
HiddenHttpMethodFilter which might expose the application to unnecessary
security risk by allowing the HTTP method to be overridden.

Closes gh-1613

spring-session-samples/spring-session-sample-boot-findbyusername/src/integration-test/java/sample/FindByUsernameTests.java

@@ -53,6 +53,8 @@ class FindByUsernameTests {
 
 	private WebDriver driver;
 
+	private WebDriver driver2;
+
 	@BeforeEach
 	void setup() {
 		this.driver = MockMvcHtmlUnitDriverBuilder.mockMvcSetup(this.mockMvc).build();
@@ -61,6 +63,9 @@ class FindByUsernameTests {
 	@AfterEach
 	void tearDown() {
 		this.driver.quit();
+		if (this.driver2 != null) {
+			this.driver2.quit();
+		}
 	}
 
 	@Test
@@ -79,6 +84,25 @@ class FindByUsernameTests {
 		home.terminateButtonDisabled();
 	}
 
+	@Test
+	void terminateOtherSession() throws Exception {
+		HomePage forgotToLogout = home(this.driver);
+
+		this.driver2 = MockMvcHtmlUnitDriverBuilder.mockMvcSetup(this.mockMvc).build();
+		HomePage terminateFogotSession = home(this.driver2);
+		terminateFogotSession.terminateSession(forgotToLogout.getSessionId()).assertAt();
+
+		LoginPage login = HomePage.go(this.driver);
+		login.assertAt();
+	}
+
+	private static HomePage home(WebDriver driver) {
+		LoginPage login = HomePage.go(driver);
+		HomePage home = login.form().login(HomePage.class);
+		home.assertAt();
+		return home;
+	}
+
 	@TestConfiguration
 	static class Config {
 

spring-session-samples/spring-session-sample-boot-findbyusername/src/integration-test/java/sample/pages/HomePage.java

@@ -56,6 +56,18 @@ public class HomePage extends BasePage {
 	}
 
 	public void terminateButtonDisabled() {
+		String sessionId = getSessionId();
+		WebElement element = getDriver().findElement(By.id("terminate-" + sessionId));
+		assertThat(element.isEnabled()).isFalse();
+	}
+
+	public HomePage terminateSession(String sessionId) {
+		WebElement terminate = getDriver().findElement(By.id("terminate-" + sessionId));
+		terminate.click();
+		return new HomePage(getDriver());
+	}
+
+	public String getSessionId() {
 		Set<Cookie> cookies = getDriver().manage().getCookies();
 		String cookieValue = null;
 		for (Cookie cookie : cookies) {
@@ -63,8 +75,7 @@ public class HomePage extends BasePage {
 				cookieValue = new String(Base64.getDecoder().decode(cookie.getValue()));
 			}
 		}
-		WebElement element = getDriver().findElement(By.id("terminate-" + cookieValue));
-		assertThat(element.isEnabled()).isFalse();
+		return cookieValue;
 	}
 
 	public HomePage logout() {

spring-session-samples/spring-session-sample-boot-findbyusername/src/main/java/sample/mvc/IndexController.java

@@ -26,8 +26,8 @@ import org.springframework.session.Session;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestMethod;
 
 /**
  * Controller for sending the user to the login view.
@@ -50,7 +50,7 @@ public class IndexController {
 	}
 	// end::findbyusername[]
 
-	@RequestMapping(value = "/sessions/{sessionIdToDelete}", method = RequestMethod.DELETE)
+	@PostMapping("/sessions/{sessionIdToDelete}")
 	public String removeSession(Principal principal, @PathVariable String sessionIdToDelete) {
 		Set<String> usersSessionIds = this.sessions.findByPrincipalName(principal.getName()).keySet();
 		if (usersSessionIds.contains(sessionIdToDelete)) {

spring-session-samples/spring-session-sample-boot-findbyusername/src/main/resources/templates/index.html

@@ -25,7 +25,7 @@
 				<td th:text="${#temporals.format(sessionElement.lastAccessedTime.atZone(T(java.time.ZoneId).systemDefault()),'dd/MMM/yyyy HH:mm:ss')}"></td>
 				<td th:text="${details?.accessType}"></td>
 				<td>
-					<form th:action="@{'/sessions/' + ${sessionElement.id}}" th:method="delete">
+					<form th:action="@{'/sessions/' + ${sessionElement.id}}" th:method="post">
 						<input th:id="'terminate-' + ${sessionElement.id}" type="submit" value="Terminate" th:disabled="${sessionElement.id == #httpSession.id}"/>
 					</form>
 				</td>