Allow media filter to set non-default permissions on derivative bitstreams
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Key: DS-740
URL: https://jira.duraspace.org/browse/DS-740
Project: DSpace
Issue Type: New Feature
Components: DSpace API
Reporter: Stuart Lewis
At present, derivative bitstreams created by filter-media all take on the authZ
policies of their parent item. In some cases, such as locked images, the
thumbnail could still be open.
>From a recent thread on dspace-tech. It seems as if this would make a useful
>feature if we can agree on a set of requirements:
Hi George,
Thanks for your reply. Do you have open access to any of your content or is it
all restricted? We have a mix which makes running the filter-media etc scripts
interesting.
Ideally the solution would be to set permissions at a collection level for each
of the types of bundles. The item permissions would then inherit from the
collection, or override if policies are set on individual items.. I don't seem
to be able to do that (1.5).
For reference, heres the (cutdown) SQL. This will update all thumbnail
bitstream policies and set them to anonymous. We only had to do it for one
group though. If you want to update intermediates, change THUMBNAIL to
BRANDED_PREVIEW.
update resourcepolicy
set epersongroup_id=0
where policy_id in (
select
rp.policy_id
from
resourcepolicy rp,
bundle2bitstream bb,
bundle b
where
b.name='THUMBNAIL'
and b.bundle_id=bb.bundle_id
and bb.bitstream_id=rp.resource_id
);
cheers,
Steve
On 04/11/2010, at 11:59 PM, George Stanley Kozak wrote:
Steve:
This is the way that thumbnails have worked for me at my site (we have been
using DSpace since 2003). It can be frustrating. Your solution is
interesting. I never thought about going into SQL to update the policies on
the thumbnail bundles. I am not sure if there are any other solutions.
George Kozak
Digital Library Specialist
Cornell University Library Information Technologies (CUL-IT)
501 Olin Library
Cornell University
Ithaca, NY 14853
607-255-8924
-----Original Message-----
From: Steve Swinsburg [mailto:[email protected]]
Sent: Wednesday, November 03, 2010 9:39 PM
To: [email protected]
Subject: Re: [Dspace-tech] thumbnails restricted if main item is restricted
We've fixed this up with some carefully crafted SQL to update the policies to
the Anonymous group for the bitstreams in the thumbnail bundles, but it would
be interesting to know if this is actually how things are meant to work, ie
inherit the permissions from the parent item when generating the thumbnails.
regards,
Steve
On 04/11/2010, at 10:53 AM, Steve Swinsburg wrote:
Hi,
We have a situation where some items in a collection are restricted, ie you
need to login to access the full version. However we want the thumbnails and
branded previews to still show up for the general public.
When we run the thumbnail generator, it seems to inherit the permissions from
the main bitstream, which means if the bitstream is protected, the thumbnail
doesn't show up unless you are logged in and have the appropriate permission.
Is this a common situation? We've inherited this instance so it might be a
change made by people before us, but if anyone has addressed this, it would be
great to hear from you.
thanks,
Steve
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