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.
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.
Thanks for your answers,
Alin
On Tue, Jan 19, 2016 at 9:45 AM Alin Ghitulan <[email protected]>
wrote:
> Thanks a lot ! I will try it out tonight and see how it goes :).
>
> On Tue, Jan 19, 2016, 08:18 Tilman Hausherr <[email protected]> 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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