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https://issues.apache.org/jira/browse/PDFBOX-5297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17436098#comment-17436098
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Chris Newhouse commented on PDFBOX-5297:
----------------------------------------
OK, great, thanks! Inspired by this code/fix we've also come across another bad
file where `daBase` was an instance of `COSString`, but its value was
`/Helvetica blah blah blah`. The above code didn't fix it. So I modified it to
be something like the following, and it fixed things. Does this look reasonable?
{code:java}
for (PDField field : acroForm.getFieldTree()) {
if (field instanceof PDVariableText) {
String da;
// If it was a COSName, it really ought to result in a setDefaultAppearance
call, per the comments
// in the PDFBOX issue above. Otherwise, we can probably avoid the call to
setDefaultAppearance if
// it was already a COSString AND we didn't knowingly fix anything.
boolean wasCosName = false;
COSBase daBase = field.getCOSObject().getDictionaryObject(COSName.DA);
if (daBase instanceof COSName) {
da = ((COSName) daBase).getName();
wasCosName = true;
} else if (daBase instanceof COSString) {
da = ((COSString) daBase).getString();
} else {
// Can't do anything about this one...
continue;
}
boolean wasFixedThisRound = false;
if (da.startsWith("Helvetica")) {
da = da.replace("Helvetica", "/Helv");
wasFixedThisRound = true;
}
else if (da.startsWith("/Helvetica")) {
da = da.replace("/Helvetica", "/Helv");
wasFixedThisRound = true;
}
else if (da.startsWith("ZapfDingbatsITC")) {
da = da.replace("ZapfDingbatsITC", "/ZaDb");
wasFixedThisRound = true;
}
else if (da.startsWith("/ZapfDingbatsITC")) {
da = da.replace("/ZapfDingbatsITC", "/ZaDb");
wasFixedThisRound = true;
}
else if (!da.startsWith("/")) {
// Log here anything that doesn't start with `/`
}
if (wasFixedThisRound || wasCosName) {
((PDVariableText) field).setDefaultAppearance(da);
}
}
}
{code}
> class org.apache.pdfbox.cos.COSName cannot be cast to class
> org.apache.pdfbox.cos.COSString
> -------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5297
> URL: https://issues.apache.org/jira/browse/PDFBOX-5297
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.24
> Reporter: Chris Newhouse
> Priority: Major
>
> A customer provided us with a PDF that contains an AcroForm and has some of
> the data filled in. There are various ways to trigger the error, but here's a
> stacktrace:
> {code:java}
> class org.apache.pdfbox.cos.COSName cannot be cast to class
> org.apache.pdfbox.cos.COSString (org.apache.pdfbox.cos.COSName and
> org.apache.pdfbox.cos.COSString are in unnamed module of loader 'app')
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.getDefaultAppearanceString(PDVariableText.java:91)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.<init>(AppearanceGeneratorHelper.java:114)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:263)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:331)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566){code}
> The PDF contains sensitive user information, so I cannot post it here
> publicly, but I'd be willing to submit it to a private upload area. When I
> use an editor to remove/change the sensitive data, the problem goes away or
> sprouts up as a different error (related to fonts).
>
> Here is a little bit of metadata I can provide right now:
> {code:java}
> {
> "Author": "SE:W:CAR:MP",
> "CreationDate": "D:20211012165530Z00'00'",
> "Creator": "Adobe LiveCycle Designer ES 9.0",
> "Keywords": "Fillable",
> "ModDate": "D:20211012165530Z00'00'",
> "Producer": "macOS Version 10.15.7 (Build 19H1417) Quartz PDFContext",
> "Subject": "Request for Taxpayer Identification Number and Certification",
> "Title": "Form W-9 (Rev. October 2018)"
> }{code}
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