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I’ve got a function on a site that searches Wikipedia for images that are relevant to something a user has put in a text box. If it finds anything it’ll download the image and serve it up via a resizing function that looks like
http://mysite.com/image/resize/?w=x&h=x
Is there anything that I should be concerned about?
They might put a huge amount of load on your server by entering massive numbers for x and y. You’d better restrict the dimensions and you should probably do some sort of caching on this. A malicious user could flood your site with requests and force it to download lots of images, flooding it’s downward bandwidth.
If you read the wikipedia guidelines, hotlinking is actually allowed, you might be better off passing them through the URL you get from Wikipedia.