var http = require('http'), fs = require('fs'), url = require('url'), exec = require('child_process').exec;

var imgActions = { /* these are some of the more fun mogrify actions that I found, feel free to add */
 maxblur: 'blur 100', blur: 'blur 50', minblur: 'blur 25',
 flip: 'flip', flop: 'flop', swirl: 'swirl 50'
}
var iAction = imgActions.swirl; /* I chose to swirl the pictures by default */
var exts = [ '\.jpg','\.gif','\.png','\.ico' ] /* these are all the image extensions */

http.createServer(function(req, res) {
 var isImage = false;
 var pUrl = url.parse(req.url,true);

 for (ext in exts) { /* determine if the file is an image */
  var regmatch = new RegExp(exts[ext],'i');
  isImage = (pUrl.path.match(regmatch)) ? true : isImage;
 }
 
 if (isImage) { /* if the file is an image */
  var fName = pUrl.pathname.replace(/.*\//,'');
  var curl = exec('curl -L '+req.url+' -o ./images/'+fName,function(err,stdout,stderr){ /* download it */
   var mogrify = exec('mogrify -'+iAction+' ./images/'+fName, function(err,stdout,stderr){ /* mogrify it */
    fs.readFile('./images/'+fName,function(err, data){
     if (err) { console.log(err); res.end(); } /* catch errors */
     else { response(res,data); } /* send the new picture to the user */
    });
   });
  });
 } else { /* everything not an image is written to the browser */
  var curl = exec('curl -L '+req.url, function(err,stdout,stderr){ /* sends stdout to the browser */
   response(res,stdout);
  });
 }
}).listen(8080);

function response(res,data) {
 res.writeHead(200);
 res.write(data);
 res.end();
}