F95API/app/scripts/classes/session.js

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2020-12-26 14:23:52 +00:00
"use strict";
// Core modules
const fs = require("fs");
const promisify = require("util").promisify;
// Public modules from npm
const md5 = require("md5");
// Promisifed functions
const areadfile = promisify(fs.readFile);
const awritefile = promisify(fs.writeFile);
const aunlinkfile = promisify(fs.unlink);
class Session {
constructor(path) {
/**
* Max number of days the session is valid.
*/
this.SESSION_TIME = 1;
/**
* Path of the session map file on disk.
*/
this._path = path;
/**
* Indicates if the session is mapped on disk.
*/
this._isMapped = fs.existsSync(this._path);
/**
* Date of creation of the session.
*/
this._created = new Date(Date.now());
/**
* MD5 hash of the username and the password.
*/
this._hash = null;
}
//#region Private Methods
/**
* @private
* Get the difference in days between two dates.
* @param {Date} a
* @param {Date} b
*/
_dateDiffInDays(a, b) {
const MS_PER_DAY = 1000 * 60 * 60 * 24;
// Discard the time and time-zone information.
const utc1 = Date.UTC(a.getFullYear(), a.getMonth(), a.getDate());
const utc2 = Date.UTC(b.getFullYear(), b.getMonth(), b.getDate());
return Math.floor((utc2 - utc1) / MS_PER_DAY);
}
/**
* @private
* Convert the object to a dictionary serializable in JSON.
*/
_toJSON() {
return {
created: this._created,
hash: this._hash,
};
}
//#endregion Private Methods
//#region Public Methods
create(username, password) {
// First, create the hash of the credentials
const value = `${username}%%%${password}`;
this._hash = md5(value);
// Update the creation date
this._created = new Date(Date.now());
}
/**
* @public
* Save the session to disk.
*/
async save() {
// Update the creation date
this._created = new Date(Date.now());
// Convert data
const json = this._toJSON();
const data = JSON.stringify(json);
// Write data
await awritefile(this._path, data);
}
/**
* @public
* Load the session from disk.
*/
async load() {
// Read data
const data = await areadfile(this._path);
const json = JSON.parse(data);
// Assign values
this._created = json.created;
this._hash = json.hash;
}
/**
* @public
* Delete the session from disk.
*/
async delete() {
await aunlinkfile(this._path);
}
/**
* @public
* Check if the session is valid.
*/
isValid(username, password) {
// Get the number of days from the file creation
const diff = this._dateDiffInDays(new Date(Date.now()), this._created);
// The session is valid if the number of days is minor than SESSION_TIME
let valid = diff < this.SESSION_TIME;
if(valid) {
// Check the hash
const value = `${username}%%%${password}`;
valid = md5(value) === this._hash;
}
return valid;
}
//#endregion Public Methods
}
module.exports = Session;