forked from mirrors/easyappointments
100 lines
2.8 KiB
PHP
100 lines
2.8 KiB
PHP
<?php defined('BASEPATH') OR exit('No direct script access allowed');
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/* ----------------------------------------------------------------------------
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* Easy!Appointments - Open Source Web Scheduler
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*
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* @package EasyAppointments
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* @author A.Tselegidis <alextselegidis@gmail.com>
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* @copyright Copyright (c) 2013 - 2018, Alex Tselegidis
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* @license http://opensource.org/licenses/GPL-3.0 - GPLv3
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* @link http://easyappointments.org
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* @since v1.0.0
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* ---------------------------------------------------------------------------- */
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/**
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* Get date in RFC3339
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* For example used in XML/Atom
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*
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* @link http://stackoverflow.com/questions/5671433/php-time-to-google-calendar-dates-time-format
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*
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* @param integer $timestamp
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* @return string date in RFC3339
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* @author Boris Korobkov
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*/
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function date3339($timestamp = 0)
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{
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if ( ! $timestamp)
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{
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$timestamp = time();
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}
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$date = date('Y-m-d\TH:i:s', $timestamp);
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$matches = [];
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if (preg_match('/^([\-+])(\d{2})(\d{2})$/', date('O', $timestamp), $matches))
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{
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$date .= $matches[1] . $matches[2] . ':' . $matches[3];
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}
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else
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{
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$date .= 'Z';
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}
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return $date;
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}
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/**
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* Generate a hash of password string.
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*
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* For user security, all system passwords are stored in hash string into the database. Use
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* this method to produce the hashed password.
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*
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* @param string $salt Salt value for current user. This value is stored on the database and
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* is used when generating the password hash.
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* @param string $password Given string password.
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* @return string Returns the hash string of the given password.
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*/
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function hash_password($salt, $password)
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{
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$half = (int)(strlen($salt) / 2);
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$hash = hash('sha256', substr($salt, 0, $half) . $password . substr($salt, $half));
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for ($i = 0; $i < 100000; $i++)
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{
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$hash = hash('sha256', $hash);
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}
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return $hash;
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}
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/**
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* Generate a new password salt.
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*
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* This method will not check if the salt is unique in database. This must be done
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* from the calling procedure.
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*
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* @return string Returns a salt string.
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*/
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function generate_salt()
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{
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$max_length = 100;
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$salt = hash('sha256', (uniqid(rand(), TRUE)));
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return substr($salt, 0, $max_length);
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}
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/**
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* This method generates a random string.
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*
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* @param int $length (OPTIONAL = 10) The length of the generated string.
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* @return string Returns the randomly generated string.
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* @link http://stackoverflow.com/a/4356295/1718162
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*/
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function generate_random_string($length = 10)
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{
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$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$random_string = '';
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for ($i = 0; $i < $length; $i++)
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{
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$random_string .= $characters[rand(0, strlen($characters) - 1)];
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}
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return $random_string;
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}
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