Am 20.01.2016 um 02:01 schrieb Alin Ghitulan:
Tilman Hausherr, Roberto Nibali
Thanks for this excellent piece of code. It seems to be dealing very well
with AcroForm. But here are some stupid questions I have:
I may have some problem understanding the API but it seems to me that those
PDActionJavaScript objects are nothing more than COSString objects with
COSName("JS") in a dictionary. Why I can't just list all objects by this
name and get them? I assume it's because they are inside of some dictionary
but then isn't there an utilitary method that can exhaustively list all
"prime" objects (string, long) ? Can you share an example on how one would
achieve this? I don't mind writing some regexs after to select only the
ones that contain javascript.
It doesn't work that way because there are direct and indirect objects
in PDF. One can list the indirect objects only (you did that somewhere).
The indirect objects are the ones that start like this "42 0 obj". These
indirect objects can have several dictionary levels nested. And then,
these indirect objects can either be seen in the PDF, or be "hidden" in
an compressed object stream.
I expect more of the javascript code to be placed inside AcroForms, there
obviously can be some code in the OpenAction ... do you have ideas where
else could be? I am new to the PDF format but I wouldn't think that it
allows to put executable javascript code anywhere in the file.
Read the PDF specification... just search for the word "javascript" and
you'll be amazed.
Tilman
Thanks for your answers,
Alin
On Tue, Jan 19, 2016 at 9:45 AM Alin Ghitulan <alinghitu...@gmail.com>
wrote:
Thanks a lot ! I will try it out tonight and see how it goes :).
On Tue, Jan 19, 2016, 08:18 Tilman Hausherr <thaush...@t-online.de> wrote:
Am 18.01.2016 um 23:19 schrieb Roberto Nibali:
This then calls dumpJavaScriptEntries() for all
non-PDFNonTerminalFields,
which finally dumps the javascript portions of your PDF (courtesy of
Tilman
Hausherr):
Ah, I forgot that I had written something at that time. Here's the
original code I wrote, although this was for that file only and other
files can have javascript elsewhere too.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 pdfboxpageimageextraction;
import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
import org.apache.pdfbox.pdmodel.interactive.action.PDAction;
import org.apache.pdfbox.pdmodel.interactive.action.PDActionJavaScript;
import
org.apache.pdfbox.pdmodel.interactive.action.PDFormFieldAdditionalActions;
import
org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;
import org.apache.pdfbox.pdmodel.interactive.form.PDNonTerminalField;
import org.apache.pdfbox.pdmodel.interactive.form.PDTerminalField;
/**
* This example will take a PDF document and print all the fields from
the file.
*
* @author Ben Litchfield
*
*/
public class PrintJavaScriptFields
{
/**
* This will print all the fields from the document.
*
* @param pdfDocument The PDF to get the fields from.
*
* @throws IOException If there is an error getting the fields.
*/
public void printFields(PDDocument pdfDocument) throws IOException
{
PDDocumentCatalog docCatalog = pdfDocument.getDocumentCatalog();
PDAcroForm acroForm = docCatalog.getAcroForm();
List<PDField> fields = acroForm.getFields();
//System.out.println(fields.size() + " top-level fields were
found on the form");
for (PDField field : fields)
{
processField(field, "|--", field.getPartialName());
}
}
private void processField(PDField field, String sLevel, String
sParent) throws IOException
{
String partialName = field.getPartialName();
if (field instanceof PDTerminalField)
{
PDTerminalField termField = (PDTerminalField) field;
PDFormFieldAdditionalActions fieldActions =
field.getActions();
if (fieldActions != null)
{
System.out.println(field.getFullyQualifiedName() + ": "
+ fieldActions.getClass().getSimpleName() + " js field actionS:\n" +
fieldActions.getCOSObject());
printPossibleJS(fieldActions.getK());
printPossibleJS(fieldActions.getC());
printPossibleJS(fieldActions.getF());
printPossibleJS(fieldActions.getV());
}
for (PDAnnotationWidget widgetAction :
termField.getWidgets())
{
PDAction action = widgetAction.getAction();
if (action instanceof PDActionJavaScript)
{
System.out.println(field.getFullyQualifiedName() +
": " + action.getClass().getSimpleName() + " js widget action:\n" +
action.getCOSObject());
printPossibleJS(action);
}
}
}
if (field instanceof PDNonTerminalField)
{
if (!sParent.equals(field.getPartialName()))
{
if (partialName != null)
{
sParent = sParent + "." + partialName;
}
}
//System.out.println(sLevel + sParent);
for (PDField child : ((PDNonTerminalField)
field).getChildren())
{
processField(child, "| " + sLevel, sParent);
}
}
else
{
String fieldValue = field.getValueAsString();
StringBuilder outputString = new StringBuilder(sLevel);
outputString.append(sParent);
if (partialName != null)
{
outputString.append(".").append(partialName);
}
outputString.append(" = ").append(fieldValue);
outputString.append(",
type=").append(field.getClass().getName());
//System.out.println(outputString);
}
}
private void printPossibleJS(PDAction kAction)
{
if (kAction instanceof PDActionJavaScript)
{
PDActionJavaScript jsAction = (PDActionJavaScript) kAction;
String jsString = jsAction.getAction();
if (!jsString.contains("\n"))
{
// Sonst erscheint in Netbeans nichts?!
jsString = jsString.replaceAll("\r",
"\n").replaceAll("\n\n", "\n");
}
System.out.println(jsString);
System.out.println();
}
}
/**
* This will read a PDF file and print out the form elements. <br />
* see usage() for commandline
*
* @param args command line arguments
*
* @throws IOException If there is an error importing the FDF
document.
*/
public static void main(String[] args) throws IOException
{
PDDocument pdf = null;
try
{
pdf = PDDocument.load(new File("XXXX", "YYYYY.pdf"));
PrintJavaScriptFields exporter = new PrintJavaScriptFields();
exporter.printFields(pdf);
}
finally
{
if (pdf != null)
{
pdf.close();
}
}
}
}
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