Add caching support for PublishedFileHandler (#13574)

Add caching support for PublishedFileHandler similar to VaadinServlet.
Testing is done manually as browser caching is difficult to develop
tests for.

Change-Id: I314745766c9feb60758547dba77eb9e13976ce91

server/src/com/vaadin/server/communication/PublishedFileHandler.java

@@ -110,7 +110,14 @@ public class PublishedFileHandler implements RequestHandler {
             return true;
         }
 
-        // TODO Check and set cache headers
+        // Set caching for the published file
+        String cacheControl = "public, max-age=0, must-revalidate";
+        int resourceCacheTime = request.getService()
+                .getDeploymentConfiguration().getResourceCacheTime();
+        if (resourceCacheTime > 0) {
+            cacheControl = "max-age=" + String.valueOf(resourceCacheTime);
+        }
+        response.setHeader("Cache-Control", cacheControl);
 
         OutputStream out = null;
         try {

uitest/src/com/vaadin/tests/resources/CachingJavaScriptComponent.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * 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 com.vaadin.tests.resources;
+
+import com.vaadin.annotations.JavaScript;
+import com.vaadin.ui.AbstractJavaScriptComponent;
+
+@JavaScript({ "cachingtest.js" })
+public class CachingJavaScriptComponent extends AbstractJavaScriptComponent {
+    public CachingJavaScriptComponent() {
+
+    }
+}

uitest/src/com/vaadin/tests/resources/PublishedFileHandlerCaching.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * 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 com.vaadin.tests.resources;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+
+/**
+ * This class tests the caching behavior of PublishedFileHandler.
+ * 
+ * Previously PublishedFileHandler did not include cache headers in it's
+ * responses. Unfortunately there isn't a good way to automate this test, so
+ * manual testing is required at this time. To test the caching behavior run
+ * this file as a java application on the development server debug
+ * configuration, and access it through the url
+ * http://localhost:8888/run/com.vaadin
+ * .tests.resources.PublishedFileHandlerCaching?restartApplication
+ * 
+ * On loading the page you'll need to examine the network traffic (e.g. with
+ * FireBug), keeping an eye on the GET requests for cachingtest.js and it's
+ * cache headers.
+ * 
+ * @author Vaadin Ltd
+ */
+public class PublishedFileHandlerCaching extends AbstractTestUI {
+
+    /**
+     * generated serialVersionUID
+     */
+    private static final long serialVersionUID = 2275457343547688505L;
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see com.vaadin.tests.components.AbstractTestUI#setup(com.vaadin.server.
+     * VaadinRequest)
+     */
+    @Override
+    protected void setup(VaadinRequest request) {
+        addComponent(new CachingJavaScriptComponent());
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see com.vaadin.tests.components.AbstractTestUI#getTestDescription()
+     */
+    @Override
+    protected String getTestDescription() {
+        return "Test that PublishedFileHandler includes appropriate cache headers.";
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see com.vaadin.tests.components.AbstractTestUI#getTicketNumber()
+     */
+    @Override
+    protected Integer getTicketNumber() {
+        return new Integer(13574);
+    }
+
+}

uitest/src/com/vaadin/tests/resources/cachingtest.js

@@ -0,0 +1,6 @@
+/**
+ * Used for testing cache header behavior.
+ */
+
+function com_vaadin_tests_resources_CachingJavaScriptComponent() {
+}