XWIKI-21763: Disable the server-side image resizing while exporting to PDF

* Using a workaround until we add support for temporarily overwrite properties from a configuration source.
* Small refactoring of PDFExportJob to reduce class-fan-out complexity

Author: mflorea

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-api/src/main/java/org/xwiki/export/pdf/internal/job/AbstractPDFExportJob.java

@@ -0,0 +1,89 @@
+/*
+ * 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.export.pdf.internal.job;
+
+import java.util.Arrays;
+
+import javax.inject.Inject;
+
+import org.xwiki.export.pdf.job.PDFExportJobRequest;
+import org.xwiki.export.pdf.job.PDFExportJobStatus;
+import org.xwiki.job.AbstractJob;
+import org.xwiki.job.GroupedJob;
+import org.xwiki.job.JobGroupPath;
+import org.xwiki.model.reference.EntityReference;
+import org.xwiki.security.authorization.AuthorizationManager;
+import org.xwiki.security.authorization.Right;
+
+/**
+ * Base class for PDF export job.
+ * 
+ * @version $Id$
+ */
+public abstract class AbstractPDFExportJob extends AbstractJob<PDFExportJobRequest, PDFExportJobStatus>
+    implements GroupedJob
+{
+    /**
+     * The PDF export job type.
+     */
+    public static final String JOB_TYPE = "export/pdf";
+
+    /**
+     * Used to check access permissions.
+     * 
+     * @see #hasAccess(Right, EntityReference)
+     */
+    @Inject
+    private AuthorizationManager authorization;
+
+    @Override
+    public String getType()
+    {
+        return JOB_TYPE;
+    }
+
+    @Override
+    public JobGroupPath getGroupPath()
+    {
+        return new JobGroupPath(Arrays.asList("export", "pdf"));
+    }
+
+    @Override
+    protected PDFExportJobStatus createNewStatus(PDFExportJobRequest request)
+    {
+        return new PDFExportJobStatus(getType(), request, this.observationManager, this.loggerManager);
+    }
+
+    /**
+     * Check access rights taking into account the job request.
+     * 
+     * @param right the access right to check
+     * @param reference the target entity reference
+     * @return return {@code true} if the current user or the entity author have the specified access right on the
+     *         specified entity, depending on the job request
+     */
+    protected boolean hasAccess(Right right, EntityReference reference)
+    {
+        return ((!this.request.isCheckRights()
+            || this.authorization.hasAccess(right, this.request.getUserReference(), reference))
+            && (!this.request.isCheckAuthorRights()
+                || this.authorization.hasAccess(right, this.request.getAuthorReference(), reference)));
+    }
+}

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-api/src/main/java/org/xwiki/export/pdf/internal/job/PDFExportJob.java

@@ -22,7 +22,6 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
-import java.util.Arrays;
 import java.util.List;
 
 import javax.inject.Inject;
@@ -34,17 +33,11 @@
 import org.xwiki.export.pdf.PDFPrinter;
 import org.xwiki.export.pdf.internal.RequiredSkinExtensionsRecorder;
 import org.xwiki.export.pdf.job.PDFExportJobRequest;
-import org.xwiki.export.pdf.job.PDFExportJobStatus;
 import org.xwiki.export.pdf.job.PDFExportJobStatus.DocumentRenderingResult;
-import org.xwiki.job.AbstractJob;
-import org.xwiki.job.GroupedJob;
-import org.xwiki.job.JobGroupPath;
 import org.xwiki.model.reference.DocumentReference;
-import org.xwiki.model.reference.EntityReference;
 import org.xwiki.model.reference.ObjectPropertyReference;
 import org.xwiki.model.reference.ObjectReference;
 import org.xwiki.resource.temporary.TemporaryResourceStore;
-import org.xwiki.security.authorization.AuthorizationManager;
 import org.xwiki.security.authorization.Right;
 
 /**
@@ -56,21 +49,8 @@
  */
 @Component
 @Named(PDFExportJob.JOB_TYPE)
-public class PDFExportJob extends AbstractJob<PDFExportJobRequest, PDFExportJobStatus> implements GroupedJob
+public class PDFExportJob extends AbstractPDFExportJob
 {
-    /**
-     * The PDF export job type.
-     */
-    public static final String JOB_TYPE = "export/pdf";
-
-    /**
-     * Used to check access permissions.
-     * 
-     * @see #hasAccess(Right, EntityReference)
-     */
-    @Inject
-    private AuthorizationManager authorization;
-
     @Inject
     private DocumentRenderer documentRenderer;
 
@@ -94,24 +74,6 @@ public class PDFExportJob extends AbstractJob<PDFExportJobRequest, PDFExportJobS
     @Inject
     private PrintPreviewURLBuilder printPreviewURLBuilder;
 
-    @Override
-    public String getType()
-    {
-        return JOB_TYPE;
-    }
-
-    @Override
-    public JobGroupPath getGroupPath()
-    {
-        return new JobGroupPath(Arrays.asList("export", "pdf"));
-    }
-
-    @Override
-    protected PDFExportJobStatus createNewStatus(PDFExportJobRequest request)
-    {
-        return new PDFExportJobStatus(getType(), request, this.observationManager, this.loggerManager);
-    }
-
     @Override
     protected void runInternal() throws Exception
     {
@@ -195,22 +157,6 @@ private int render(DocumentReference documentReference, DocumentRendererParamete
         return renderingResult.getHTML().length();
     }
 
-    /**
-     * Check access rights taking into account the job request.
-     * 
-     * @param right the access right to check
-     * @param reference the target entity reference
-     * @return return {@code true} if the current user or the entity author have the specified access right on the
-     *         specified entity, depending on the job request
-     */
-    private boolean hasAccess(Right right, EntityReference reference)
-    {
-        return ((!this.request.isCheckRights()
-            || this.authorization.hasAccess(right, this.request.getUserReference(), reference))
-            && (!this.request.isCheckAuthorRights()
-                || this.authorization.hasAccess(right, this.request.getAuthorReference(), reference)));
-    }
-
     private void saveAsPDF() throws IOException
     {
         URL printPreviewURL = this.printPreviewURLBuilder.getPrintPreviewURL(this.request);

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-test/xwiki-platform-export-pdf-test-content/src/main/resources/PDFExportIT/Parent/Child/WebHome.xml

@@ -40,7 +40,15 @@
 
 Content of first section.
 
-image:attach:xwiki-logo.png</content>
+[[image:attach:xwiki-logo.png||width="100"]]
+
+[[image:attach:xwiki-logo.png||width="100" class="force-server-side-resize"]]
+
+{{velocity}}
+{{html}}
+&lt;img src="$doc.getAttachmentURL('xwiki-logo.png', 'download', 'height=50')" alt="XWiki Logo" /&gt;
+{{/html}}
+{{/velocity}}</content>
   <attachment>
     <filename>xwiki-logo.png</filename>
     <mimetype>image/png</mimetype>

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-test/xwiki-platform-export-pdf-test-docker/pom.xml

@@ -69,6 +69,13 @@
       <version>${project.version}</version>
       <scope>runtime</scope>
     </dependency>
+    <!-- Needed to verify that image server-side resize is disabled while exporting to PDF. -->
+    <dependency>
+      <groupId>org.xwiki.platform</groupId>
+      <artifactId>xwiki-platform-image-processing-plugin</artifactId>
+      <version>${project.version}</version>
+      <scope>runtime</scope>
+    </dependency>
     <!--Test only dependencies. -->
     <dependency>
       <groupId>org.xwiki.platform</groupId>

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-test/xwiki-platform-export-pdf-test-docker/src/test/it/org/xwiki/export/pdf/test/ui/AllIT.java

@@ -46,7 +46,8 @@
         // Starting or stopping the Office server requires PR (for the current user, on the main wiki reference).
         // Enabling debug logs also requires PR.
         "xwikiPropertiesAdditionalProperties=test.prchecker.excludePattern="
-            + ".*:(XWiki\\.OfficeImporterAdmin|PDFExportIT\\.EnableDebugLogs)"
+            + ".*:(XWiki\\.OfficeImporterAdmin|PDFExportIT\\.EnableDebugLogs)",
+        "xwikiCfgPlugins=com.xpn.xwiki.plugin.image.ImagePlugin",
     }
 )
 @ExtendWith(PDFExportExecutionCondition.class)

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-test/xwiki-platform-export-pdf-test-docker/src/test/it/org/xwiki/export/pdf/test/ui/PDFExportIT.java

@@ -81,7 +81,8 @@
         // Starting or stopping the Office server requires PR (for the current user, on the main wiki reference).
         // Enabling debug logs also requires PR.
         "xwikiPropertiesAdditionalProperties=test.prchecker.excludePattern="
-            + ".*:(XWiki\\.OfficeImporterAdmin|PDFExportIT\\.EnableDebugLogs)"
+            + ".*:(XWiki\\.OfficeImporterAdmin|PDFExportIT\\.EnableDebugLogs)",
+        "xwikiCfgPlugins=com.xpn.xwiki.plugin.image.ImagePlugin",
     }
 )
 @ExtendWith(PDFExportExecutionCondition.class)
@@ -225,11 +226,20 @@ void exportAsPDF(TestUtils setup, TestConfiguration testConfiguration) throws Ex
             assertTrue(contentPageText.contains("Child\nSection 1\nContent of first section.\n"),
                 "Child document content missing: " + contentPageText);
 
-            // The content of the child document shows an image.
+            // The content of the child document shows the same image multiple times.
             List<PDFImage> contentPageImages = pdf.getImagesFromPage(3);
-            assertEquals(1, contentPageImages.size());
+            assertEquals(3, contentPageImages.size());
+
+            // Verify the images included in the PDF are not resized server-side (we know the image width is specified
+            // in the source wiki syntax and we enabled the server-side image resize by default).
             assertEquals(512, contentPageImages.get(0).getRawWidth());
             assertEquals(512, contentPageImages.get(0).getRawHeight());
+            assertEquals(512, contentPageImages.get(2).getRawWidth());
+            assertEquals(512, contentPageImages.get(2).getRawHeight());
+
+            // For the second image we force the server-side resize.
+            assertEquals(100, contentPageImages.get(1).getRawWidth());
+            assertEquals(100, contentPageImages.get(1).getRawHeight());
         }
     }
 

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-ui/src/main/resources/XWiki/PDFExport/Sheet.xml

@@ -822,6 +822,38 @@ require([
     }).wrap("<span></span>");
   };
 
+  /**
+   * Removes the image size (width and height) from the image URL query string in order to prevent the server-side
+   * resize of the image, thus allowing the full size image to be included in the generated PDF.
+   */
+  async function disableServerSideImageResize() {
+    const imageLoadPromises = []
+    document.querySelectorAll('#xwikicontent img:not(.force-server-side-resize)').forEach(image => {
+      const imageURL = new URL(image.src);
+      const imageParams = imageURL.searchParams;
+      if (imageParams.has('width') || imageParams.has('height')) {
+        // Backup the original query string before we modify the image URL.
+        const oldImageQueryString = imageURL.search;
+        // The image size is specified in the URL which may trigger a server-side resize. We want the full image to be
+        // included in the PDF so let's remove these parameters.
+        imageParams.delete('width');
+        imageParams.delete('height');
+        const newImageQueryString = '?' + imageParams.toString();
+        const newImageSrc = image.getAttribute('src').replace(oldImageQueryString, newImageQueryString);
+        // Create a promise for when the full size image is loaded.
+        imageLoadPromises.push(new Promise((resolve, reject) => {
+          image.addEventListener('load', resolve);
+          image.addEventListener('error', reject);
+          image.addEventListener('abort', resolve);
+          image.setAttribute('src', newImageSrc);
+        }));
+      }
+    });
+    await Promise.allSettled(imageLoadPromises);
+  }
+
+  pageReady.delayPageReady(disableServerSideImageResize(), 'Disable server-side image resize.');
+
   // Adjust the exported content before performing the print layout.
   pageReady.afterPageReady(() => {
     refactorAnchors();

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-ui/src/main/resources/XWiki/PDFExport/Translations.ko.xml

@@ -110,4 +110,4 @@ XWiki.PDFExport.ConfigurationClass_maxContentSize.hint=단일 PDF 내보내기 
 XWiki.PDFExport.ConfigurationClass_replaceFOP=FOP 교체
 XWiki.PDFExport.ConfigurationClass_replaceFOP.hint=Apache Formatting Objects Processor(FOP)를 기반으로 이전 PDF 내보내기를 대체합니다.
 </content>
-  </xwikidoc>
+</xwikidoc>