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Posted to dev@nutch.apache.org by "Guillaume Smet (JIRA)" <ji...@apache.org> on 2008/08/08 17:27:44 UTC
[jira] Updated: (NUTCH-643) ClassCastException in PdfParser on
encrypted PDF with empty password
[ https://issues.apache.org/jira/browse/NUTCH-643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guillaume Smet updated NUTCH-643:
---------------------------------
Attachment: parse-pdf-PDFBox_upgrade.diff
> ClassCastException in PdfParser on encrypted PDF with empty password
> --------------------------------------------------------------------
>
> Key: NUTCH-643
> URL: https://issues.apache.org/jira/browse/NUTCH-643
> Project: Nutch
> Issue Type: Bug
> Components: fetcher
> Affects Versions: 1.0.0
> Environment: This problem affects the current trunk too.
> Reporter: Guillaume Smet
> Attachments: parse-pdf-PDFBox_upgrade.diff
>
>
> 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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