Short and Secure MongoDB ObjectID

index.js

var asciiStr = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 + /".split(" ");
var my64shortStr = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 - _".split(" ");

var ascii2my64 = {};
var my64toascii = {};

for(var i = 0; i < asciiStr.length; i++){
  ascii2my64[asciiStr[i]] = my64shortStr[i];
  my64toascii[my64shortStr[i]] = asciiStr[i];
}

// Encode
function to64(id){
  id = new Buffer(id, 'hex').toString('base64');
  for(var k in ascii2my64){
    id = id.replace(k,ascii2my64[k],'g');
  }
  return id;
}

// Decode
function from64(str){
  for(var k in my64toascii){
    str = str.replace(k,my64toascii[k],'g');
  }
  return new Buffer(str, 'base64').toString('hex');
}

// Test
var objid = '543f560dcb65dec05d01995a';
var shortedid;
console.log(shortedid = to64(objid)); // VD9WDctl3sBdAZla
console.log(from64(shortedid) === objid); // true


// Usage and Example
// Implement to Schema and Model 
var mongoose = required('mongoose');

var bookSchema = new Schema({
  title: { type: String, trim: true, required: true },
  author: { type: String, trim: true, required: true },
  published: { type: Date, required: true },
  price: { type: Number, required: true }
});

var book = mongoose.model('book', bookSchema);

// To get shortedId from single object
bookSchema.virtual('shortedID').get = function(){
  return to64(this._id);
}

// Find with ShortedId from Model
book.findByShortedId = function(id, fields, options, callback){
  return this.findById(from64(id, fields, options, callback));
}