> > The first three we can get from pretty much either API, or extract >> directly from >> > a dump file. The latter is eluding us though, for two reasons. One is >> that a >> > file, like 30C3_Commons_Machinery_2.jpg, is actually in the /b/ba/ >> directory - >> > but where this /b/ba/ comes from (a hash?) is unclear to us now, and >> it's not >> > something we find in the dumps - though we can get it from one of the >> APIs. >> > > Yes, /b/ba ist based on the first two digits of the MD5 hash of the title: > > md5( "30C3_Commons_Machinery_2.jpg" ) -> ba253c78d894a80788940a3ca765debb > > But this is "arcane knowledge" which nobody should really rely on. The > canonical > way would be to use > > https://commons.wikimedia.org/wiki/Special:Redirect/file/30C3_Commons_Machinery_2.jpg > > Which generates a redirect to > > https://upload.wikimedia.org/wikipedia/commons/b/ba/30C3_Commons_Machinery_2.jpg > > To get a thumbnail, you can directly manipulate that URL, by inserting > "thumb/" > and the desired size in the correct location (maybe Special:Redirect can > do that > for you, but I do not know how): > > > https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/30C3_Commons_Machinery_2.jpg/640px-30C3_Commons_Machinery_2.jpg >
If I am not mistaken you can use thumb.php to get the needed thumb? <https://commons.wikimedia.org/w/thumb.php?f=Example.jpg&width=100> (That’s what I used in my CommonsDownloader [1]) [1] < https://github.com/Commonists/CommonsDownloader/blob/master/commonsdownloader/thumbnaildownload.py > Hope that helps, -- Jean-Frédéric
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