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Better license check. 

Tokenise CC license parts and check for compatability.
Fallback is old directly-equal test.
This commit is contained in:
Stephen Paul Weber 2009-04-16 10:57:35 -04:00
parent 6d6de3c1c7
commit 58b9ce5946
1 changed files with 19 additions and 0 deletions
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19
lib/util.php
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@ -1360,9 +1360,28 @@ function common_memcache()
}
}
function common_license_terms($uri)
{
if(preg_match('/creativecommons.org\/licenses\/([^\/]+)/', $uri, $matches)) {
return explode('-',$matches[1]);
}
return array($uri);
}
function common_compatible_license($from, $to)
{
$from_terms = common_license_terms($from);
// public domain and cc-by are compatible with everything
if(count($from_terms) == 1 && ($from_terms[0] == 'publicdomain' || $from_terms[0] == 'by')) {
return true;
}
$to_terms = common_license_terms($to);
// sa is compatible across versions. IANAL
if(in_array('sa',$from_terms) || in_array('sa',$to_terms)) {
return count(array_diff($from_terms, $to_terms)) == 0;
}
// XXX: better compatibility check needed here!
// Should at least normalise URIs
return ($from == $to);
}