XWIKI-21472: Directly write RSS feed content in Main.DatabaseSearch

* Add a page test

xwiki-platform-core/xwiki-platform-search/xwiki-platform-search-ui/pom.xml

@@ -79,5 +79,12 @@
       <type>test-jar</type>
       <scope>test</scope>
     </dependency>
+
+    <dependency>
+      <groupId>org.xwiki.platform</groupId>
+      <artifactId>xwiki-platform-feed-api</artifactId>
+      <version>${project.version}</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>

xwiki-platform-core/xwiki-platform-search/xwiki-platform-search-ui/src/main/resources/Main/DatabaseSearch.xml

@@ -120,8 +120,21 @@
     #set ($discard = $feed.setDescription($services.localization.render('search.rss', [$text])))
     #set ($discard = $feed.setLanguage("$xcontext.locale"))
     #set ($discard = $feed.setCopyright($xwiki.getXWikiPreference('copyright')))
+    #set ($feedOutput = $xwiki.feed.getFeedOutput($feed, $xwiki.getXWikiPreference('feed_type', 'rss_2.0')))
+
     #set ($discard = $response.setContentType('application/rss+xml'))
-    {{{$xwiki.feed.getFeedOutput($feed, $xwiki.getXWikiPreference('feed_type', 'rss_2.0'))}}}
+    #set ($characterEncoding = 'utf-8')
+    ## Make sure the Character Encoding response header matches the character encoding used to write the response and
+    ## compute its length.
+    #set ($discard = $response.setCharacterEncoding($characterEncoding))
+    ## We write the output directly to the response to avoid the execution of the Rendering Transformations.
+    #set ($discard = $response.writer.print($feedOutput))
+    ## The content length is measured in bytes and one character can use more than one byte.
+    #set ($discard = $response.setContentLength($feedOutput.getBytes($characterEncoding).size()))
+    ## Make sure the entire content is send back to the client.
+    #set ($discard = $response.flushBuffer())
+    ## Make sure XWiki doesn't write any more content to the response.
+    #set ($discard = $xcontext.setFinished(true))
   #else
     {{include reference="XWiki.Results"/}}
 

xwiki-platform-core/xwiki-platform-search/xwiki-platform-search-ui/src/test/java/org/xwiki/search/ui/DatabaseSearchPageTest.java

@@ -0,0 +1,103 @@
+/*
+ * See the NOTICE file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.xwiki.search.ui;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.xwiki.model.reference.DocumentReference;
+import org.xwiki.rendering.RenderingScriptServiceComponentList;
+import org.xwiki.rendering.internal.configuration.DefaultRenderingConfigurationComponentList;
+import org.xwiki.rendering.syntax.Syntax;
+import org.xwiki.test.annotation.ComponentList;
+import org.xwiki.test.page.HTML50ComponentList;
+import org.xwiki.test.page.PageTest;
+import org.xwiki.test.page.TestNoScriptMacro;
+import org.xwiki.test.page.XWikiSyntax21ComponentList;
+
+import com.xpn.xwiki.doc.XWikiDocument;
+import com.xpn.xwiki.plugin.feed.FeedPlugin;
+import com.xpn.xwiki.web.XWikiServletResponseStub;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Page test for {@code Main.DatabaseSearch}.
+ *
+ * @version $Id$
+ */
+@ComponentList({
+    TestNoScriptMacro.class
+})
+@RenderingScriptServiceComponentList
+@DefaultRenderingConfigurationComponentList
+@HTML50ComponentList
+@XWikiSyntax21ComponentList
+class DatabaseSearchPageTest extends PageTest
+{
+    private static final String WIKI_NAME = "xwiki";
+
+    private static final String MAIN_SPACE = "Main";
+
+    private static final DocumentReference DATABASE_SEARCH_REFERENCE =
+        new DocumentReference(WIKI_NAME, MAIN_SPACE, "DatabaseSearch");
+
+    @BeforeEach
+    void setUp()
+    {
+        this.xwiki.initializeMandatoryDocuments(this.context);
+
+        this.xwiki.getPluginManager().addPlugin("feed", FeedPlugin.class.getName(), this.context);
+    }
+
+    @Test
+    void checkRSSFeedContent() throws Exception
+    {
+        String unescapedText = "<b>}}}{{noscript}}</b>";
+        String escapedText = "&lt;b&gt;}}}{{noscript}}&lt;/b&gt;";
+
+        this.request.put("text", unescapedText);
+        this.context.setAction("get");
+
+        XWikiDocument databaseSearchDocument = loadPage(DATABASE_SEARCH_REFERENCE);
+        this.context.setDoc(databaseSearchDocument);
+
+        // Get directly the writer to check the RSS feed.
+        StringWriter out = new StringWriter();
+        PrintWriter writer = new PrintWriter(out);
+        this.response = new XWikiServletResponseStub() {
+            @Override
+            public PrintWriter getWriter()
+            {
+                return writer;
+            }
+        };
+        this.context.setResponse(this.response);
+
+        String rssFeed = databaseSearchDocument.displayDocument(Syntax.PLAIN_1_0, this.context);
+        assertTrue(rssFeed.isEmpty());
+
+        rssFeed = out.toString();
+        assertTrue(rssFeed.contains("<title>search.rss [" + escapedText + "]</title>"));
+        assertTrue(rssFeed.contains("<description>search.rss [" + escapedText + "]</description>"));
+    }
+}