remove photo from mongodb and from amazon s3

removephoto.js

/* from photo mongo database and s3 */
var removePhoto = function(){
	mongoclient.connect(database, function(err, db) {

		if (err) throw err;
		
		/* url../remove?98c582c7d329/3b1fa423d917 - album:98c582c7d329 photo:3b1fa423d917 */
		var url = require('url').parse(req.url).query;
		var album = underscore.words(url, '/')[0];
		var photo = underscore.words(url, '/')[1];
		
		findAlbumByUrlHashInDB();
		
		function findAlbumByUrlHashInDB(){
			var collection = db.collection('albums');
			collection.findOne({hash:album}, function(err, album) {
				if (err) throw err;
				findPhotoInAlbum(album);
			});
		}
		
		function findPhotoInAlbum(album) {
			var realNames = {};
			var photos = album.files;
			photos.forEach(function(element){
				if (element.hash===photo) {
					realNames.photo = element.name;
					realNames.album = album.name;
					removePhotoFromS3(realNames, removePhotoFromDB);
				}
			});
		}
		
		function removePhotoFromS3(realNames, callback){
			s3.client.deleteObject({
				Bucket : settings.bucket,
				Key : settings.home + '/Photos/' + realNames.album + '/' + realNames.photo
			}, function(err){
				if(err) throw err;
				callback(realNames.photo);
			});
		}
		
		function removePhotoFromDB(photoName){
			/* remove item in array files where name=title parameter */
			var collection = db.collection('albums');
			collection.update({hash:album}, {$pull:{files:{name:photoName}}}, function(err) {
				if (err) throw err;
				res.redirect('/photos/album?'+album);
				db.close();
			});
		}
		
	});	
}; // removePhoto