Hi
One of my PDF library methods reads the following method (stripped to
remove references to other internal library calls not relevant to your
question):
private void executeDumpJS(String srcDocName) throws IOException {
PDDocument srcDoc = null;
try {
srcDoc = PDDocument.load(new File(srcDocName));
srcDoc.getDocumentCatalog().getAcroForm().getFields().forEach(this::dumpJSEntry);
srcDoc.close();
} catch (Exception e) {
// do something
} finally {
if (srcDoc != null) {
srcDoc.close();
}
}
}
The input string is the PDF file. The dumpJSEntry() method looks as follows:
private void dumpJSEntry(PDField srcField) {
if (srcField instanceof PDNonTerminalField) {
((PDNonTerminalField)
srcField).getChildren().forEach(this::dumpJSEntry);
} else if (!(srcField instanceof PDSignatureField)) {
dumpJavaScriptEntries(srcField);
}
}
This then calls dumpJavaScriptEntries() for all non-PDFNonTerminalFields,
which finally dumps the javascript portions of your PDF (courtesy of Tilman
Hausherr):
private void dumpJavaScriptEntries(PDField field) {
final String fqName = field.getFullyQualifiedName();
final PDFormFieldAdditionalActions fieldActions = field.getActions();
if (fieldActions != null) {
final StringBuilder sb = new StringBuilder();
final Formatter formatter = new Formatter(sb, Locale.ENGLISH);
formatter.format("// %s [%s]:%n", fqName,
fieldActions.getClass().getSimpleName());
System.out.printf("%s", sb.toString());
/**
* This will dump a JavaScript action to be performed when the user
* types a keystroke into a text field or combo box or modifies the
* selection in a scrollable list box. This allows the keystroke to
* be checked for validity and rejected or modified.
*/
printPossibleJS(fieldActions.getK());
/**
* This will dump a JavaScript action to be performed in order
* to recalculate the value of this field when that of another
* field changes.
*/
printPossibleJS(fieldActions.getC());
/**
* This will dump a JavaScript action to be performed before
* the field is formatted to display its current value. This
* allows the field's value to be modified before formatting.
*/
printPossibleJS(fieldActions.getF());
/**
* This will dump a JavaScript action to be performed
* when the field's value is changed. This allows the
* new value to be checked for validity.
*/
printPossibleJS(fieldActions.getV());
}
final PDTerminalField termField = (PDTerminalField) field;
for (PDAnnotationWidget widgetAction : termField.getWidgets()) {
final PDAction action = widgetAction.getAction();
if (action instanceof PDActionJavaScript) {
final StringBuilder sb = new StringBuilder();
final Formatter formatter = new Formatter(sb, Locale.ENGLISH);
formatter.format("// %s [%s]:%n", fqName,
action.getClass().getSimpleName());
System.out.printf("%s", sb.toString());
printPossibleJS(action);
}
}
}
Now, only one last piece is missing, printPossibleJS(), which again
originates from some code written by Tilman Hausherr:
private void printPossibleJS(PDAction kAction) {
if (kAction instanceof PDActionJavaScript) {
final PDActionJavaScript jsAction = (PDActionJavaScript) kAction;
String jsString = jsAction.getAction();
if (!jsString.contains("\n")) {
jsString = jsString.replaceAll("\r", "\n").replaceAll("\n\n", "\n");
}
System.out.println(jsString);
System.out.println();
}
}
Couldn't find a simpler way to do this, since a PDF basically is a directed
graph of objects. Pick out the pieces you need.
Hope it helps.
Cheers
Roberto
On Mon, Jan 18, 2016 at 6:43 AM, Alin Ghitulan <[email protected]>
wrote:
> Hello,
>
> Can anyone help me accomplish this? I need some direction on how to obtain
> a list of objects in PDF that contains JavaScript code so I can further
> process the JS code.
>
> Thanks,
> Alin
>
