New subject: [Mediawiki-l] Does wikipedia use different methods to compute the hash part of an image path?

6 Dec 2011

You could also use Special:FilePath.

Definitely a good idea. We long for a day when we can eliminate the  
current way we organize files and do things like renaming a file in the ui  
without having to rename files, handling paths in a way that don't suffer  
 from negative caching effects and make it so the url of an old file  
version is the same as when it was the main file, and maybe even  
possibilities like using only one file instead of multiples when two files  
have the same contents.

Those kind of changes we could make in the future would completely destroy  
clients that hardcode this kind of handling.me

On Tue, 06 Dec 2011 06:40:12 -0800, C Stafford &lt;c.stafford(a)gmail.com&gt;  
wrote:

...
  You may be more future proof by asking the API for the
image url,
 rather then trying to figure it out your self, as each wiki install
 may have other factors that determine that director/hash structure
 (i've seen places that have 3 levels, not 2)

http://en.wikipedia.org/w/api.php?action=query&prop=imageinfo&iipro…

 On Mon, Dec 5, 2011 at 6:25 PM, Tommy Chheng &lt;tommy.chheng(a)gmail.com&gt;  
 wrote:
> I'm computing the url of an image by the following:
> (the md5 of the first char and the second two chars concat)
>
>   val md = MessageDigest.getInstance("MD5")
>   val messageDigest = md.digest(fileName.getBytes)
>   val md5 = (new BigInteger(1, messageDigest)).toString(16)
>
>   val hash1 = md5.substring(0, 1)
>   val hash2 = md5.substring(0, 2)
>
>   val urlPart = hash1 + "/" + hash2 + "/" + fileName
>
> Most of the time, the function works correctly but on a few cases, it
> is incorrect:
>
> For "Stewie_Griffin.png", I get 2/26/Stewie_Griffin.png but the real
> one is 0/02/Stewie_Griffin.png
>
> The source file info is here:
> http://en.wikipedia.org/wiki/File:Stewie_Griffin.png
> http://upload.wikimedia.org/wikipedia/en/0/02/Stewie_Griffin.png
>
> Any ideas why the hashing scheme doesn't work sometimes?
>
> I posted this question on stackoverflow but I might be able to get a
> better answer  
>
here.http://stackoverflow.com/questions/8389616/does-wikipedia-use-differen…
>
> --
> @tommychheng
> http://tommy.chheng.com
>
> _______________________________________________
> Mediawiki-api mailing list
> Mediawiki-api(a)lists.wikimedia.org
> https://lists.wikimedia.org/mailman/listinfo/mediawiki-api 

-- 
~Daniel Friesen (Dantman, Nadir-Seen-Fire) [http://daniel.friesen.name]

Re: [Mediawiki-l] Does wikipedia use different methods to compute the hash part of an image path?