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<?php
namespace Jasny\Authz;
/**
* Authorize by access level.
*
* <code>
* class Auth extends Jasny\Auth
* {
* use Jasny\Authz\ByLevel;
*
* protected function getAccessLevels()
* {
* return [
* 'user' => 1,
* 'moderator' => 100,
* 'admin' => 1000
* ];
* }
* }
* </code>
*/
trait ByLevel
{
/**
* Get the authenticated user
*
* @return User
*/
abstract public function user();
/**
* Get all access levels.
*
* @return array
*/
abstract protected function getAccessLevels();
/**
* Get access level by name.
*
* @param string|int $role
* @return int
* @throws DomainException for unknown level names
*/
public function getLevel($role)
{
if (is_int($role) || (is_string($role) && ctype_digit($role))) {
return (int)$role;
}
if (!is_string($role)) {
$type = (is_object($role) ? get_class($role) . ' ' : '') . gettype($role);
throw new \InvalidArgumentException("Expected role to be a string, not a $type");
}
$levels = $this->getAccessLevels();
if (!isset($levels[$role])) {
throw new \DomainException("Authorization level '$role' isn't defined.");
}
return $levels[$role];
}
/**
* Get all authz roles
*
* @return array
*/
public function getRoles()
{
$levels = $this->getAccessLevels();
if (!is_array($levels)) {
throw new \UnexpectedValueException("Access levels should be an array");
}
return array_keys($levels);
}
/**
* Check if the current user is logged in and has specified role.
*
* <code>
* if (!$auth->is('manager')) {
* http_response_code(403); // Forbidden
* echo "You are not allowed to view this page";
* exit();
* }
* </code>
*
* @param string|int $role
* @return boolean
*/
public function is($role)
{
if (!in_array($role, $this->getRoles())) {
trigger_error("Unknown role '$role'", E_USER_NOTICE);
return false;
}
$user = $this->user();
if (!isset($user)) {
return false;
}
try {
$userLevel = $this->getLevel($user->getRole());
} catch (\DomainException $ex) {
trigger_error("Unknown user role '" . $user->getRole() . "'", E_USER_NOTICE);
return false;
} catch (\Exception $ex) {
trigger_error($ex->getMessage(), E_USER_WARNING);
return false;
}
return $userLevel >= $this->getLevel($role);
}
}
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