pics/models/Authentication.php

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<?php
/*****************************************************************************
* Authentication.php
* Contains key class Authentication.
*
* Kabuki CMS (C) 2013-2015, Aaron van Geffen
*****************************************************************************/
/**
* Authentication class, containing various static functions used for account verification
* and session management.
*/
class Authentication
{
/**
* Checks whether a user still exists in the database.
*/
public static function checkExists($id_user)
{
$res = Registry::get('db')->queryValue('
SELECT id_user
FROM users
WHERE id_user = {int:id}',
[
'id' => $id_user,
]);
return $res !== null;
}
/**
* Finds the user id belonging to a certain emailaddress.
*/
public static function getUserId($emailaddress)
{
$res = Registry::get('db')->queryValue('
SELECT id_user
FROM users
WHERE emailaddress = {string:emailaddress}',
[
'emailaddress' => $emailaddress,
]);
return empty($res) ? false : $res;
}
public static function setResetKey($id_user)
{
return Registry::get('db')->query('
UPDATE users
SET reset_key = {string:key}
WHERE id_user = {int:id}',
[
'id' => $id_user,
'key' => self::newActivationKey(),
]);
}
public static function checkResetKey($id_user, $reset_key)
{
$key = Registry::get('db')->queryValue('
SELECT reset_key
FROM users
WHERE id_user = {int:id}',
[
'id' => $id_user,
]);
return $key == $reset_key;
}
/**
* Verifies whether the user is currently logged in.
*/
public static function isLoggedIn()
{
// Check whether the active session matches the current user's environment.
if (isset($_SESSION['ip_address'], $_SESSION['user_agent']) && (
(isset($_SERVER['REMOTE_ADDR']) && $_SESSION['ip_address'] != $_SERVER['REMOTE_ADDR']) ||
(isset($_SERVER['HTTP_USER_AGENT']) && $_SESSION['user_agent'] != $_SERVER['HTTP_USER_AGENT'])))
{
session_destroy();
return false;
}
// A user is logged in if a user id exists in the session and this id is (still) in the database.
return isset($_SESSION['user_id']) && self::checkExists($_SESSION['user_id']);
}
/**
* Generates a new activation key.
*/
public static function newActivationKey()
{
$alpha = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
$string = '';
for ($i = 0; $i < 16; $i++)
$string .= $alpha[mt_rand(0, strlen($alpha) - 1)];
return $string;
}
/**
* Checks a password for a given username against the database.
*/
public static function checkPassword($emailaddress, $password)
{
// Retrieve password hash for user matching the provided emailaddress.
$password_hash = Registry::get('db')->queryValue('
SELECT password_hash
FROM users
WHERE emailaddress = {string:emailaddress}',
[
'emailaddress' => $emailaddress,
]);
// If there's no hash, the user likely does not exist.
if (!$password_hash)
return false;
return password_verify($password, $password_hash);
}
/**
* Computes a password hash.
*/
public static function computeHash($password)
{
$hash = password_hash($password, PASSWORD_DEFAULT);
if (!$hash)
throw new Exception('Hash creation failed!');
return $hash;
}
/**
* Resets a password for a certain user.
*/
public static function updatePassword($id_user, $hash)
{
return Registry::get('db')->query('
UPDATE users
SET
password_hash = {string:hash},
reset_key = {string:blank}
WHERE id_user = {int:id_user}',
[
'id_user' => $id_user,
'hash' => $hash,
'blank' => '',
]);
}
}