Correct, better not rely on thumb.php, the servers will just generate the thumb if it is not yet present on the canonical address yet, that Special:Redirect can point you at.
Also, almost all this info can be retrieved in one go from the api.php of course:
http://commons.wikimedia.org/w/api.php?action=query&titles=File:30C3_Com...
Lists almost all the info of the latest revision of the file.
DJ
On Thu, Sep 4, 2014 at 3:04 PM, Daniel Schwen daniel@schwen.de wrote:
I was told thumb.php is evil (for lack of caching). I'm using special:redirect with the width=640 parameter. Daniel
On Sep 4, 2014 5:49 AM, "Jean-Frédéric" jeanfrederic.wiki@gmail.com wrote:
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_Machin...
Which generates a redirect to
https://upload.wikimedia.org/wikipedia/commons/b/ba/30C3_Commons_Machinery_2...
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_Machi...
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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