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https://issues.apache.org/jira/browse/TIKA-1232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13892210#comment-13892210
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Andrew Jackson commented on TIKA-1232:
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Yes, you can't identify > 1.7 PDF or the PDF/A variants unless you do a bit
more parsing. In case it helps, here's the code I wrote to do that (and also
extract other metadata of interest to me):
https://github.com/openplanets/nanite/blob/master/nanite-ext/src/main/java/uk/bl/wa/tika/parser/pdf/pdfbox/PDFParser.java#L253
I couldn't do what I wanted by sub-classing the Tika code, so I copied the
PDFParser and augmented it. If there is interest in taking this code into Tika
I'd be willing to spend time turning it into a proper patch.
As for how to record the result, this is definitely not the
Application-Version. A modern version of Adobe Distiller can output various
versions of PDF, because it chooses the version of the format based on the
needs of the current document. i.e. if a document only requires PDF 1.4
features, it will output a PDF 1.4 and not just default to the latest version
(AFAICT).
My preference would be to use a version parameter on the content type. It's not
a formally standardised approach, but has been adopted in a few places (e.g.
[Java plugin
versions|http://docs.oracle.com/javase/7/docs/technotes/guides/plugin/developer_guide/faq/basics.html#version])
In this case, you'd have something like:
{quote}
application/pdf; version=1.4
application/pdf; version="1.7 Adobe Extension Level 5"
etc...
{quote}
although to avoid causing trouble for code that relies on the 'Content-Type'
property, I have so far chosen to use a new property for this purpose (called
'Extended-Content-Type').
> Add PDF version to PDFParser output
> -----------------------------------
>
> Key: TIKA-1232
> URL: https://issues.apache.org/jira/browse/TIKA-1232
> Project: Tika
> Issue Type: Improvement
> Components: parser
> Affects Versions: 1.5
> Environment: JDK6
> Reporter: William Palmer
> Assignee: Tim Allison
> Priority: Minor
> Attachments: pdfversion.patch
>
>
> I'd like to identify the PDF version of files, this is not currently reported
> by the PDFParser although the information is available via PDFBox. I have
> attached a patch that adds the format version to the Metadata object.
> However, I am not familiar enough with the Tika source to know if an
> alternative metadata key should be used, or this new one added.
> Comments welcome.
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