Implement Post-Redirect-Get

Note that CSRF protection doesn't work yet, see mvc-spec/ozark#202
mthmulders · Sep 6, 2018 · f8900f5 · f8900f5
1 parent 8b5e1a8
commit f8900f5
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Showing 4 changed files with 73 additions and 2 deletions.
diff --git a/src/main/java/it/mulders/junk/mvc/presentation/HelloController.java b/src/main/java/it/mulders/junk/mvc/presentation/HelloController.java
@@ -7,23 +7,54 @@
 import javax.mvc.Models;
 import javax.mvc.Controller;
 import javax.mvc.View;
+import javax.mvc.security.CsrfProtected;
 import javax.ws.rs.GET;
+import javax.ws.rs.FormParam;
 import javax.ws.rs.Path;
+import javax.ws.rs.POST;
 import javax.ws.rs.QueryParam;
+import java.util.Locale;
 
 @RequestScoped
 @Controller
 @Path("hello")
 public class HelloController {
+    @Inject
+    UserPreferences preferences;
+
     @Inject
     Models models;
 
     @Inject
     GreetingService greetingService;
 
+    @GET
+    @Path("/start")
+    @View("input.jsp")
+    public void start() {
+    }
+
+    private Locale detectLocale(final String input) {
+        if (input != null && input.length() > 0) {
+            return Locale.forLanguageTag(input);
+        } else {
+            return Locale.US;
+        }
+    }
+
+    @CsrfProtected
+    @POST
+    @Path("/configure")
+    @View("redirect:/hello")
+    public void configure(@FormParam("locale") final String locale) {
+        final Locale result = detectLocale(locale);
+        preferences.setLocale(result);
+    }
+
     @GET
     @View("hello.jsp")
     public void hello(@QueryParam("name") final String name) {
-        models.put("greeting", greetingService.generateGreeting(name));
+        final Locale locale = preferences.getLocale();
+        models.put("greeting", greetingService.generateGreeting(locale, name));
     }
 }
diff --git a/src/main/java/it/mulders/junk/mvc/presentation/UserPreferences.java b/src/main/java/it/mulders/junk/mvc/presentation/UserPreferences.java
@@ -0,0 +1,18 @@
+package it.mulders.junk.mvc.presentation;
+
+import javax.enterprise.context.SessionScoped;
+import java.io.Serializable;
+import java.util.Locale;
+
+@SessionScoped
+public class UserPreferences implements Serializable {
+    private Locale locale;
+
+    public Locale getLocale() {
+        return locale;
+    }
+
+    public void setLocale(Locale locale) {
+        this.locale = locale;
+    }
+}
diff --git a/src/main/webapp/WEB-INF/views/hello.jsp b/src/main/webapp/WEB-INF/views/hello.jsp
@@ -5,6 +5,6 @@
 </head>
 <body>
 <h1>Hello, ${greeting.name}</h1>
-<div>Current date and time is ${greeting.currentDateTime}</div>
+<div>Current date and time is: ${greeting.currentDateTime}</div>
 </body>
 </html>
diff --git a/src/main/webapp/WEB-INF/views/input.jsp b/src/main/webapp/WEB-INF/views/input.jsp
@@ -0,0 +1,22 @@
+<!doctype html>
+<html>
+<head>
+    <title>Hello MVC</title>
+</head>
+<body>
+<div>
+    <form action="${pageContext.request.contextPath}/app/hello/configure" method="post">
+        <input type="hidden" name="${mvc.csrf.name}" value="${mvc.csrf.token}"/>
+        <label for="locale">Select the language of your choice</label>
+        <select id="locale" name="locale">
+            <option value="nl-NL">Dutch</option>
+            <option value="de-DE">German</option>
+            <option value="fr-FR">French</option>
+            <option value="en-UK">English (UK)</option>
+            <option value="en-US">English (US)</option>
+        </select>
+        <button type="submit">Submit</button>
+    </form>
+</div>
+</body>
+</html>