UFAL/BE-54-Preview files from ZIP

[milanmajchrak]

Problem description

Actual CLARIN-DSpace5.* allows the user to preview all ZIP files e.g., https://lindat.mff.cuni.cz/repository/xmlui/handle/11234/1-5150
CLARIN-DSpace5.x repository: https://github.com/ufal/clarin-dspace

Requirements:

• This preview mode is allowed only for the Items that has ClarinLicense.label = PUB.
• Preview of the ZIP files are generated in the BE. Code where the preview content is loaded: https://github.com/ufal/clarin-dspace/blob/clarin/dspace-xmlui/src/main/java/org/dspace/app/xmlui/objectmanager/ItemAdapter.java#L1155
  This preview content is loaded from the local.bitstream.file. Check local metadata definition: https://github.com/ufal/clarin-dspace/blob/clarin/dspace/config/registries/local-types.xml#L101 . I couldn't find any place where this data was added into this metadata. We must add somewhere this preview data into local.bitstream.file.

Notes:

• If you create a new metadata definition in the local-types.xml you must run command dspace database migrate force from the dspace/bin
• Proof that preview content is stored in the local.bitstream.file metadata (view from the admin view from the CLARIN-DSpace5.x):

1. Admin Edit Page View of the Item:
   
2. Local metadata of the bitstream
   
3. Preview
   

• We want to process the preview content in the BE because of security issues. E.g., restricted Items preview cannot be seen for the Anonymous user: https://lindat.mff.cuni.cz/repository/xmlui/handle/11234/1-1664