helene/data/serialization.js

Real-time Web Apps for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.serialize = serialize;
exports.deserialize = deserialize;
const model_1 = require("./model");
/**
 * Serialize an object to be persisted to a one-line string
 * For serialization/deserialization, we use the native JSON parser and not eval or Function
 * That gives us less freedom but data entered the database may come from users
 * so eval and the like are not safe
 * Accepted primitive types: Number, String, Boolean, Date, null
 * Accepted secondary types: Objects, Arrays
 */
function serialize(obj) {
    return JSON.stringify(obj, function (k, v) {
        (0, model_1.checkKey)(k, v);
        if (v === undefined) {
            return undefined;
        }
        if (v === null) {
            return null;
        }
        // Hackish way of checking if object is Date (this way it works between execution contexts in node-webkit).
        // We can't use value directly because for dates it is already string in this function (date.toJSON was already called), so we use this
        if (typeof this[k].getTime === 'function') {
            return { $$date: this[k].getTime() };
        }
        return v;
    });
}
/**
 * From a one-line representation of an object generate by the serialize function
 * Return the object itself
 */
function deserialize(rawData) {
    return JSON.parse(rawData, function (k, v) {
        if (k === '$$date') {
            return new Date(v);
        }
        if (typeof v === 'string' ||
            typeof v === 'number' ||
            typeof v === 'boolean' ||
            v === null) {
            return v;
        }
        if (v && v.$$date) {
            return v.$$date;
        }
        return v;
    });
}
//# sourceMappingURL=serialization.js.map