Resize photos using Imagemagick and Node.js

server2.js

var im = require('imagemagick');
var Guid = require('guid');

function reducePhoto(req, res, next){
    var photoIngested = req.photosUploaded['original'];
    if (photoIngested) {
        var sizeName = sizes[req.nextSizeIndex].name;
        var destPath = photoIngested.metadata.path + '-' + sizeName ;
        var nameParts = photoIngested.metadata.filename.split('.');
        var newName = nameParts[0] + '-' + sizeName + '.' + nameParts[1];
        var width = sizes[req.nextSizeIndex].width;

        im.resize({
          srcPath: photoIngested.metadata.path,
          dstPath: destPath,
          width:   width
        }, function(err, stdout, stderr){
          if (err) {
              next(err);
          } else {
            console.log("The photo was resized to " + width + "px wide");
            var guid = Guid.create();
            var fileId = guid + '/' + newName;
            var ratio = photoIngested.metadata.width / width;
            var height = photoIngested.metadata.height / ratio;
            var gs = asmsClient.streamLib.GridStore(asmsClient.streamLib.realMongoDB, fileId, "w", {
                  content_type : req.files.image.type,
                  metadata : {
                      author: req.session.user._id,
                      public : false,
                      filename: newName,
                      width: width,
                      height: height,
                      path: destPath
                  }
              });
              gs.writeFile(destPath, function(err, doc){
                  if (err) {
                    next(err);
                  } else {
                      var url = siteConf.uri + "/photos/" + fileId;
                      req.photosUploaded[sizeName] = {url : url, metadata: gs.metadata};
                      req.nextSizeIndex = req.nextSizeIndex + 1;
                      next();
                  }
              });
          }
        });
    }
};