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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-643) ClassCastException in PdfParser on encrypted PDF with empty password
Date Fri, 06 Feb 2009 13:13:59 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671117#action_12671117
] 

Andrzej Bialecki  commented on NUTCH-643:
-----------------------------------------

Fixed in rev. 741558, using CVS HEAD version of PDFBox 0.7.4 from SourceForge. During tests
on documents containing images I discovered that it's necessary to add JAI libraries too -
this unfortunately increased the size of the plugin.

> 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
>            Assignee: Andrzej Bialecki 
>             Fix For: 1.0.0
>
>         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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