* There no token with the given name in session
* The token time is in past
*
*
* @param $tokan_name string The name of the CSRF token
* @return Token The token
*/
function getToken($tokan_name) {
if (!isset($_SESSION['tokens'])) {
$_SESSION['tokens'] = [];
}
if (!isset($_SESSION['tokens'][$tokan_name]) || $_SESSION['tokens'][$tokan_name]->isGone()) {
$_SESSION['tokens'][$tokan_name] = new Token();
}
return $_SESSION['tokens'][$tokan_name]->getValue();
}
/**
* Check if a given value is corresponding to the token in session.
*
* @param $tokan_name string Name of the token
* @param $csrf string Value to check
* @return bool true if the token is well checked
*/
public function checkCsrf($tokan_name, $csrf) {
$checked = $_SESSION['tokens'][$tokan_name]->getValue() === $csrf;
if($checked) {
unset($_SESSION['tokens'][$tokan_name]);
}
return $checked;
}
/**
* Verify if the current session allows to access given poll.
*
* @param $poll \stdClass The poll which we seek access
* @return bool true if the current session can access this poll
*/
public function canAccessPoll($poll) {
if (is_null($poll->password_hash)) {
return true;
}
$this->ensureSessionPollSecurityIsCreated();
$currentPassword = isset($_SESSION['poll_security'][$poll->id]) ? $_SESSION['poll_security'][$poll->id] : null;
if (!empty($currentPassword) && PasswordHasher::verify($currentPassword, $poll->password_hash)) {
return true;
} else {
unset($_SESSION['poll_security'][$poll->id]);
return false;
}
}
/**
* Submit to the session a poll password
*
* @param $poll \stdClass The poll which we seek access
* @param $password string the password to compare
*/
public function submitPollAccess($poll, $password) {
if (!empty($password)) {
$this->ensureSessionPollSecurityIsCreated();
$_SESSION['poll_security'][$poll->id] = $password;
}
}
private function ensureSessionPollSecurityIsCreated() {
if (!isset($_SESSION['poll_security'])) {
$_SESSION['poll_security'] = array();
}
}
}