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<?php
/**
* Token.php - Token class
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @author Marco Diedrich <mdiedric@uos.de>
* @license GPL2 or any later version
*/
class Token extends SimpleORMap
{
/**
* Configures the model
*
* @param array $config
*/
protected static function configure($config = [])
{
$config['db_table'] = 'user_token';
$config['belongs_to']['user'] = [
'class_name' => User::class,
'foreign_key' => 'user_id',
];
// Create new token and ensure token is unique upon store
$config['registered_callbacks']['before_create'][] = function ($object) {
do {
$token = md5(uniqid(__CLASS__, true));
} while (Token::exists($token));
$object->token = $token;
};
// Ensure tokens are not changed
$config['registered_callbacks']['before_store'][] = function ($object) {
if (!$object->isNew() && $object->isFieldDirty('token')) {
return false;
}
};
parent::configure($config);
}
/**
* Creates a new token.
*
* @param integer $duration Lifetime of the token
* @param mixed $user_id Optional id of the user (defaults to current user)
* @return string the token
*/
public static function create($duration = 30, $user_id = null)
{
$token = new static();
$token->user_id = $user_id ?? $GLOBALS['user']->id;
$token->expiration = strtotime("+{$duration} seconds");
$token->store();
return $token->token;
}
/**
* Checks if a token is valid (for a given user).
*
* Based on the number of paremters this either returns the id of the user
* the token belongs to or a boolean if the id of a user was already given.
*
* @param string $token Token to check
* @param mixed $user_id Optional id of a user
* @return mixed User id of none was given or boolean
*/
public static function isValid($token, $user_id = null)
{
$token = static::find($token);
// No db entry for token
if (!$token || $token->isExpired()) {
return null;
}
// Token is valid
$token_user_id = $token->user_id;
$token->delete();
return func_num_args() === 1
? $token_user_id
: $token_user_id === ($user_id ?? $GLOBALS['user']->id);
}
/**
* Returns whether the token is expired
* @return boolean
*/
public function isExpired()
{
return $this->expiration < time();
}
}
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