ClassCastException in PdfParser on encrypted PDF with empty password
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Key: NUTCH-643
URL: https://issues.apache.org/jira/browse/NUTCH-643
Project: Nutch
Issue Type: Bug
Components: fetcher
Affects Versions: 0.9.0
Environment: This problem affects the current trunk too.
Reporter: Guillaume Smet
Hi,
If a PDF document is encrypted with an empty password, the PdfParser should
decrypt it using the empty password.
This behaviour is implemented with the following code:
if (pdf.isEncrypted()) {
DocumentEncryption decryptor = new DocumentEncryption(pdf);
//Just try using the default password and move on
decryptor.decryptDocument("");
}
It uses a deprecated API and moreover it seems there is a bug in PDFBox in this
deprecated API (we have a ClassCastException in PDFBox) as we have the
following error:
2008-08-07 19:15:56,860 WARN parse.pdf - General exception in PDF parser:
org.pdfbox.pdmodel.encryption.PDEncryptionDictionary cannot be cast to
org.pdfbox.pdmodel.encryption.PDStandardEncryption
2008-08-07 19:15:56,862 WARN parse.pdf - java.lang.ClassCastException:
org.pdfbox.pdmodel.encryption.PDEncryptionDictionary cannot be cast to
org.pdfbox.pdmodel.encryption.PDStandardEncryption
2008-08-07 19:15:56,862 WARN parse.pdf - at
org.pdfbox.encryption.DocumentEncryption.decryptDocument(DocumentEncryption.java:197)
2008-08-07 19:15:56,862 WARN parse.pdf - at
org.apache.nutch.parse.pdf.PdfParser.getParse(PdfParser.java:98)
2008-08-07 19:15:56,862 WARN parse.pdf - at
org.apache.nutch.parse.ParseUtil.parse(ParseUtil.java:82)
2008-08-07 19:15:56,862 WARN parse.pdf - at
org.apache.nutch.fetcher.Fetcher$FetcherThread.output(Fetcher.java:336)
2008-08-07 19:15:56,862 WARN parse.pdf - at
org.apache.nutch.fetcher.Fetcher$FetcherThread.run(Fetcher.java:178)
2008-08-07 19:15:56,874 WARN fetcher.Fetcher - Error parsing:
http://www2.culture.gouv.fr/deps/fr/stateurope071.pdf: failed(2,0): Can't be
handled as pdf document. java.lang.ClassCastException:
org.pdfbox.pdmodel.encryption.PDEncryptionDictionary cannot be cast to
org.pdfbox.pdmodel.encryption.PDStandardEncryption
Using the new security API, we don't have any error parsing this document and
we can get its content:
if (pdf.isEncrypted()) {
// Just try using the default password and move
on
pdf.openProtection(new
StandardDecryptionMaterial(""));
}
I attached the patch fixing this problem: it works perfectly with the above
document and get rids of the deprecated API.
Regards,
--
Guillaume
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