[Koha-bugs] [Bug 9580] New: Cover image from Coce, a remote image URL cache

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=9580

            Bug ID: 9580
           Summary: Cover image from Coce, a remote image URL cache
    Classification: Unclassified
 Change sponsored?: ---
           Product: Koha
           Version: 3.12
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: OPAC
          Assignee: oleonard at myacpl.org
          Reporter: frederic at tamil.fr

Add to Koha support for displaying Book cover requested to Coce, a
remote image URL cache:

  https://github.com/fredericd/coce

With this enhancement, cover images are not fetched directly from
Amazon, Google, and so on. Their URL are requested via a web service to
Coce which manages a cache of URLs. 

Three cover image providers are now available: Google Books (gb), Amazon
(aws), and Open Library (ol). Two system preferences enable this service:

  - CoceHost - URL of Coce server
  - CoceProviders - Ordered list of requested providers. For example
    gb,aws,ol, will return the first available URL from those providers.

Several advantages to this architecture:

  - If a book cover is not available from a provider, but is available
    from another one, Koha will be able to display a book cover, which
    isn't the case now
  - Since URLs are cached, it isn't necessary for each book cover to
    request, again and again, the provider, and several of them if
    necessary.
  - Amazon book covers are retrieved with Amazon Product Advertising
    API, which means that more covers are retrieved (ISBN13).

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