141 lines
3.3 KiB
JavaScript
141 lines
3.3 KiB
JavaScript
"use strict";
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// Core modules
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const fs = require("fs");
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const promisify = require("util").promisify;
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// Public modules from npm
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const md5 = require("md5");
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// Promisifed functions
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const areadfile = promisify(fs.readFile);
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const awritefile = promisify(fs.writeFile);
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const aunlinkfile = promisify(fs.unlink);
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class Session {
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constructor(path) {
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/**
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* Max number of days the session is valid.
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*/
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this.SESSION_TIME = 1;
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/**
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* Path of the session map file on disk.
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*/
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this._path = path;
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/**
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* Indicates if the session is mapped on disk.
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*/
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this._isMapped = fs.existsSync(this._path);
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/**
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* Date of creation of the session.
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*/
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this._created = new Date(Date.now());
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/**
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* MD5 hash of the username and the password.
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*/
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this._hash = null;
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}
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//#region Private Methods
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/**
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* @private
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* Get the difference in days between two dates.
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* @param {Date} a
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* @param {Date} b
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*/
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_dateDiffInDays(a, b) {
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const MS_PER_DAY = 1000 * 60 * 60 * 24;
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// Discard the time and time-zone information.
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const utc1 = Date.UTC(a.getFullYear(), a.getMonth(), a.getDate());
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const utc2 = Date.UTC(b.getFullYear(), b.getMonth(), b.getDate());
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return Math.floor((utc2 - utc1) / MS_PER_DAY);
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}
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/**
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* @private
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* Convert the object to a dictionary serializable in JSON.
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*/
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_toJSON() {
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return {
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created: this._created,
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hash: this._hash,
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};
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}
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//#endregion Private Methods
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//#region Public Methods
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create(username, password) {
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// First, create the hash of the credentials
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const value = `${username}%%%${password}`;
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this._hash = md5(value);
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// Update the creation date
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this._created = new Date(Date.now());
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}
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/**
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* @public
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* Save the session to disk.
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*/
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async save() {
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// Update the creation date
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this._created = new Date(Date.now());
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// Convert data
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const json = this._toJSON();
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const data = JSON.stringify(json);
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// Write data
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await awritefile(this._path, data);
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}
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/**
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* @public
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* Load the session from disk.
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*/
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async load() {
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// Read data
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const data = await areadfile(this._path);
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const json = JSON.parse(data);
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// Assign values
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this._created = json.created;
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this._hash = json.hash;
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}
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/**
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* @public
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* Delete the session from disk.
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*/
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async delete() {
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await aunlinkfile(this._path);
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}
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/**
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* @public
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* Check if the session is valid.
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*/
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isValid(username, password) {
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// Get the number of days from the file creation
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const diff = this._dateDiffInDays(new Date(Date.now()), this._created);
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// The session is valid if the number of days is minor than SESSION_TIME
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let valid = diff < this.SESSION_TIME;
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if(valid) {
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// Check the hash
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const value = `${username}%%%${password}`;
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valid = md5(value) === this._hash;
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}
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return valid;
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}
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//#endregion Public Methods
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}
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module.exports = Session; |