Use Fedora URIs in Fedora for linked resources

[whikloj]

Coming off this discussion (https://groups.google.com/d/topic/islandora-dev/WqgmbkLlUUY/discussion) and some others.

This ticket is to create a service to map the Drupal URIs that are passed to Fedora back to Fedora URIs.

So currently NonRDFSource resources in Fedora will pcdm:hasFile http://localhost:8000/media/2?_format=jsonld instead of having a link to that object in Fedora.

 <http://localhost:8080/fcrepo/rest/4d/b4/f7/c3/4db4f7c3-9167-4a2d-9fd7-cf52a26c8e60>
        pcdm:hasFile           <http://localhost:8000/media/2?_format=jsonld> ;
        pcdm:hasFile           <http://localhost:8000/media/1?_format=jsonld> ;
        ...

This API-X service will take a ldp:RDFSource object and return the RDF with either

1. New triples added to mirror the Drupal ones but with Fedora ones. ie.

   <http://localhost:8080/fcrepo/rest/4d/b4/f7/c3/4db4f7c3-9167-4a2d-9fd7-cf52a26c8e60>
      pcdm:hasFile           <http://localhost:8000/media/2?_format=jsonld> ;
      pcdm:hasFile           <http://localhost:8080/fcrepo/rest/96/ea/3c/35/96ea3c35-d08e-4812-8c9e-cd0d6d1bd839> ;
      pcdm:hasFile           <http://localhost:8000/media/1?_format=jsonld> ;
      pcdm:hasFile           <http://localhost:8080/fcrepo/rest/92/c5/ca/63/92c5ca63-0e53-4c56-a8e8-f786c75c3da5> ;
     ....
   

2. The Drupal triples are replaced.

   <http://localhost:8080/fcrepo/rest/4d/b4/f7/c3/4db4f7c3-9167-4a2d-9fd7-cf52a26c8e60>
      pcdm:hasFile           <http://localhost:8080/fcrepo/rest/96/ea/3c/35/96ea3c35-d08e-4812-8c9e-cd0d6d1bd839> ;
      pcdm:hasFile           <http://localhost:8080/fcrepo/rest/92/c5/ca/63/92c5ca63-0e53-4c56-a8e8-f786c75c3da5> ;
     ....
   

Or maybe this could be an option passed to the service at request time.

[dannylamb]

Third option: Replaced if the mapping exists, otherwise leave the url unchanged.

[dannylamb]

We'll also want to consider the effects of doing something like owl:sameAs with #768, as your first option could actually be gotten for free from the triplestore if we used inferencing.

[kanasznagyzoltan]

Danny, when Could This fix be ready? Thank you!

[kanasznagyzoltan]

Thank you Jared, i read in the recast service task you created a service which can resolve the drupal node link into a fedora resource link.

[kanasznagyzoltan]

This could be a really really good feature of Fedora indexing. Could i ask when could this feature be the part of the Fedora indexing? Thank you for the info!

[dannylamb]

@kanasznagyzoltan It will be available via https://github.com/Islandora-Devops/claw-playbook as soon as Islandora/Crayfish-Commons#16 and Islandora/Crayfish#44 are merged

[kanasznagyzoltan]

Danny, thank you for the info! We will try it out when it is ready :)

[kanasznagyzoltan]

Hello Danny and Jared!

When could be this feature ready for testing under the whole Islandora CLAW system?
Thank you!

Zoli.

[kanasznagyzoltan]

When could it be the part of the claw?

[dannylamb]

@kanasznagyzoltan The recast service is included in installs and is available for you to use / evaluate. Thanks for hanging in there!