[Koha-bugs] [Bug 7187] Prioritize cover image sources such as Amazon, Google and add fail over i.e. if first source fails, go to next

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=7187

--- Comment #6 from Magnus Enger <magnus at enger.priv.no> ---
One thing we need to decide on is whether the logic that checks multiple
sources should be in JavaScript on the client side or Perl on the server side.
I'm leaning towards Perl on the server, for two reasons: 

1. Displaying an image could be as simple as this:

  <img src="opac-ver.pl?biblionumber=x" />

2. We could cache the results of looking through multiple sources. (Caching
might violate the terms of service for e.g. Amazon, but then we could check
them last, after we have checked the ones that we can cache.)

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