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<?php /* Copyright (c) 2024 Freya Murphy */
class AuthHelper {
private $session_lifetime_seconds;
function __construct() {
$this->session_lifetime_seconds = 60 * 60 * 24 * 3;
}
/**
* Generate a random token
* @param int $length
*/
private function gen_token(int $length): string {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$random = '';
for ($i = 0; $i < $length; $i++) {
$index = rand(0, strlen($characters) - 1);
$random .= $characters[$index];
}
return $random;
}
/**
* Saves a user into the session specified by their auth key
* @param Session $session - the session user data
*/
public function save_session(Session $session): void {
$path = "/tmp/{$session->token}";
$data = json_encode($session->to_array());
file_put_contents($path, $data, LOCK_EX);
}
public function delete_session(Session $session): int {
$path = "/tmp/{$session->token}";
return unlink($path) ? 0 : 1;
}
/**
* Loads the auth session associated with a specific key
* @param string $token - the session $key
*/
private function load_session(string $token): ?Session {
try {
$path = "/tmp/$token";
if (!file_exists($path)) {
return NULL;
}
$content = file_get_contents($path);
$json = json_decode($content, TRUE);
$session = new Session();
if ($session->from_array($json))
return NULL;
return $session;
} catch (Exception $e) {
return NULL;
}
}
/**
* Creates a new session for a user
*/
public function create_session(User $user): Session {
$session = new Session();
$session->token = $this->gen_token(128);
$session->created = time();
$session->user = $user;
$session->reset_expiry();
$this->save_session($session);
return $session;
}
/**
* Gets the current authed session
*/
public function get_session(): ?Session {
$cookie_name = getenv("COOKIE_NAME");
if(!isset($_COOKIE[$cookie_name])) {
return NULL;
}
$token = $_COOKIE[$cookie_name];
return $this->load_session($token);
}
}
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