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bson.js
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bson.js
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'use strict';
var mongodb = require('mongodb');
var vm = require('vm');
var json = require('./json');
//Adaptors for BSON types
var DBRef = function(namespace, oid, db) {
//Allow empty/undefined db value
if (db === undefined || db === null) {
db = '';
}
return mongodb.DBRef(namespace, oid, db);
};
var Timestamp = function(high, low) {
//Switch low/high bits to Timestamp constructor
return mongodb.Timestamp(low, high);
};
//Create sandbox with BSON data types
exports.getSandbox = function() {
return {
Long: mongodb.Long,
NumberLong: mongodb.Long,
Double: mongodb.Double,
NumberDouble: mongodb.Double,
ObjectId: mongodb.ObjectID,
ObjectID: mongodb.ObjectID,
Timestamp: Timestamp,
DBRef: DBRef,
Dbref: DBRef,
Binary: mongodb.Binary,
BinData: mongodb.Binary,
Code: mongodb.Code,
Symbol: mongodb.Symbol,
MinKey: mongodb.MinKey,
MaxKey: mongodb.MaxKey,
ISODate: Date,
Date: Date,
};
};
//JSON.parse doesn't support BSON data types
//Document is evaluated in a vm in order to support BSON data types
//Sandbox contains BSON data type functions from node-mongodb-native
exports.toBSON = function(string) {
var sandbox = exports.getSandbox();
string = string.replace(/ISODate\(/g, 'new ISODate(');
vm.runInNewContext('doc = eval((' + string + '));', sandbox);
return sandbox.doc;
};
// This function as the name suggests attempts to parse
// the free form string in to BSON, since the possibilities of failure
// are higher, this function uses a try..catch
exports.toSafeBSON = function(string) {
try {
var bsonObject = exports.toBSON(string);
return bsonObject;
}
catch (err) {
return null;
}
};
// Converts string to ObjectID. TODO: Add validation.
exports.toObjectId = function(string) {
var sandbox = exports.getSandbox();
// Strip quotes
string = string.replace('"', '').replace('"', '');
// Convert ObjectId("526ddf5a9f610ffd26000001") to 526ddf5a9f610ffd26000001
string = string.replace(/ObjectID\(/i, '').replace(')', '');
// Make sure it's a 24-character string to prevent errors.
if (string.length === 24) {
return sandbox.ObjectID(string);
} else {
return false;
}
};
//Convert BSON documents to string
exports.toString = function(doc) {
//Use custom json stringify function from json.js
return json.stringify(doc, null, ' ');
};
exports.toJsonString = function(doc) {
var sJson = json.stringify(doc, null);
sJson = sJson.replace(/ObjectID\(/g, '{ "$oid": ');
sJson = sJson.replace(/ISODate\(/g, '');
sJson = sJson.replace(/\)/g, ' }');
return sJson;
};