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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2024 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.kernel.utils;
import com.itextpdf.commons.utils.MessageFormatUtil;
import com.itextpdf.kernel.logs.KernelLogMessageConstant;
import com.itextpdf.kernel.pdf.PdfArray;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfNameTree;
import com.itextpdf.kernel.pdf.PdfObject;
import com.itextpdf.kernel.pdf.PdfString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Utility class which provides functionality to merge ECMA scripts from pdf documents
*/
public class PdfScriptMerger {
private static final Logger LOGGER = LoggerFactory.getLogger(PdfScriptMerger.class);
private static final Set allowedAAEntries = Collections
.unmodifiableSet(new HashSet<>(Arrays.asList(
PdfName.WC,
PdfName.WS,
PdfName.DS,
PdfName.WP)));
/**
* Merges ECMA scripts from source to destinations from all possible places for them,
* it only copies first action in chain for AA and OpenAction entries
*
* @param source source document from which script will be copied
* @param destination destination document to which script will be copied
*/
public static void mergeScripts(PdfDocument source, PdfDocument destination) {
mergeOpenActionsScripts(source, destination);
mergeAdditionalActionsScripts(source, destination);
mergeNamesScripts(source, destination);
}
/**
* Copies AA catalog entry ECMA scripts, it only copies first action in chain
*
* @param source source document from which script will be copied
* @param destination destination document to which script will be copied
*/
public static void mergeAdditionalActionsScripts(PdfDocument source, PdfDocument destination) {
PdfDictionary sourceAA = source.getCatalog().getPdfObject().getAsDictionary(PdfName.AA);
PdfDictionary destinationAA = destination.getCatalog().getPdfObject().getAsDictionary(PdfName.AA);
if (sourceAA == null || sourceAA.isEmpty()) {
return;
}
if (destinationAA == null) {
destinationAA = new PdfDictionary();
destination.getCatalog().getPdfObject().put(PdfName.AA, destinationAA);
}
for (Map.Entry entry : sourceAA.entrySet()) {
if (destinationAA.containsKey(entry.getKey())) {
LOGGER.error(MessageFormatUtil.format(KernelLogMessageConstant.CANNOT_MERGE_ENTRY, entry.getKey()));
return;
}
if (!allowedAAEntries.contains(entry.getKey())) {
continue;
}
destinationAA.put(entry.getKey(), copyECMAScriptActionsDictionary(destination, (PdfDictionary) entry.getValue()));
}
}
/**
* Copies open actions catalog entry ECMA scripts, it only copies first action in chain
*
* @param source source document from which script will be copied
* @param destination destination document to which script will be copied
*/
public static void mergeOpenActionsScripts(PdfDocument source, PdfDocument destination) {
PdfObject sourceOpenAction = source.getCatalog().getPdfObject().get(PdfName.OpenAction);
if (sourceOpenAction instanceof PdfArray) {
return;
}
PdfDictionary sourceOpenActionDict = source.getCatalog().getPdfObject().getAsDictionary(PdfName.OpenAction);
if (sourceOpenActionDict == null || sourceOpenActionDict.isEmpty() || !PdfName.JavaScript.equals(sourceOpenActionDict.get(PdfName.S))) {
return;
}
PdfObject destinationOpenAction = destination.getCatalog().getPdfObject().get(PdfName.OpenAction);
if (destinationOpenAction != null) {
LOGGER.error(MessageFormatUtil.format(KernelLogMessageConstant.CANNOT_MERGE_ENTRY, PdfName.OpenAction));
return;
}
destination.getCatalog().getPdfObject().put(PdfName.OpenAction, copyECMAScriptActionsDictionary(destination, sourceOpenActionDict));
}
/**
* Copies ECMA scripts from Names catalog entry
*
* @param source source document from which script will be copied
* @param destination destination document to which script will be copied
*/
public static void mergeNamesScripts(PdfDocument source, PdfDocument destination) {
PdfDictionary namesDict = source.getCatalog().getPdfObject().getAsDictionary(PdfName.Names);
if (namesDict == null || !namesDict.containsKey(PdfName.JavaScript)) {
return;
}
PdfDictionary destinationNamesDict = destination.getCatalog().getPdfObject().getAsDictionary(PdfName.Names);
if ((destinationNamesDict != null && destinationNamesDict.get(PdfName.JavaScript) != null)
|| destination.getCatalog().nameTreeContainsKey(PdfName.JavaScript)) {
LOGGER.error(MessageFormatUtil.format(KernelLogMessageConstant.CANNOT_MERGE_ENTRY, PdfName.JavaScript));
return;
}
PdfNameTree sourceTree = new PdfNameTree(source.getCatalog(), PdfName.JavaScript);
PdfNameTree destinationTree = destination.getCatalog().getNameTree(PdfName.JavaScript);
for (Map.Entry entry : sourceTree.getNames().entrySet()) {
PdfDictionary ECMAScriptActionsDirectCopy = copyECMAScriptActionsDictionary(destination,
entry.getValue().isIndirect() ? (PdfDictionary) entry.getValue().getIndirectReference().getRefersTo()
: (PdfDictionary) entry.getValue());
destinationTree.addEntry(entry.getKey(), ECMAScriptActionsDirectCopy);
}
}
private static PdfDictionary copyECMAScriptActionsDictionary(PdfDocument destination, PdfDictionary actions) {
PdfObject originalScriptSource = actions.get(PdfName.JS);
PdfObject scriptType = actions.get(PdfName.S);
PdfDictionary actionsCopy = new PdfDictionary();
if (originalScriptSource != null) {
actionsCopy.put(PdfName.JS, originalScriptSource.copyTo(destination));
}
if (scriptType != null) {
actionsCopy.put(PdfName.S, scriptType.copyTo(destination));
}
return actionsCopy;
}
}
