Hi Patrick,
DSpace has events for certain actions, but I don't believe there is
anything that you can chain ahead of a download, that will allow you to
alter the contents. I have built a cover-page generator for DSpace, that is
custom code that on-the-fly generates an altered version of the PDF. This
doesn't affect the Archival/stored version of the PDF, just the
Disseminated/downloaded version of the PDF that the end user receives. The
admin user gets the Archival version, when they're logged in.
The place where we altered the code to make this happen was in XMLUI's
BitstreamReader, where we added some logic to determine if this object was
eligible for watermarking (i.e. is PDF?, is enabled for this collection?,
is user non-admin?).
You can read a wiki page about that at:
https://github.com/osulibraries/DSpace/wiki/Citation-Cover-Page
For this feature to be considered more complete, it would be wise to also
clean it up so that all bitstream-serving endpoints (JSPUI, XMLUI, OAI,
REST, ...) also had the same logic.
________________
Peter Dietz
Longsight
www.longsight.com
[email protected]
p: 740-599-5005 x809
On Sun, Aug 3, 2014 at 8:30 PM, Patrick Rynhart <[email protected]>
wrote:
> We would like to add a watermark and/or annotations to PDFs that are
> downloaded on the fly. As an example, any paper that you download from
> the Physics Archive (arxiv.org) has some annotations - e.g.:
>
> http://arxiv.org/pdf/1407.8441.pdf
>
> (In particular, note the download date and arXiv reference number
> printed vertically in the left-hand margin.)
>
> I'd like to be able to do this using ghostscript etc., but first DSpace
> would need to support some kind of prehook when an asset is downloaded
> on demand. I had a look around the documentation but couldn't find
> anything useful.
>
> (Note: This is not a question about the preview thumbnails that are
> displayed in DSpace - but the actual underlying asset served up by DSpace.)
>
> With Thanks,
>
> Patrick
>
>
>
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