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<?php
/**
* @link https://www.humhub.org/
* @copyright Copyright (c) 2021 HumHub GmbH & Co. KG
* @license https://www.humhub.com/licences
*/
namespace humhub\modules\user\components;
use humhub\modules\user\models\User as UserModel;
use Yii;
use yii\base\Behavior;
/**
* Impersonator behavior provides actions to impersonate users by admin
*
* @since 1.10
* @property-read UserModel|null $impersonator Admin user who impersonate the current User
* @property-read bool $isImpersonated Whether this user is impersonated by admin currently. This property is read-only.
* @author luke
*/
class Impersonator extends Behavior
{
/**
* @var User
*/
public $owner;
/**
* Determines if the current user can impersonate the given user.
*
* @param UserModel $user
* @return bool
*/
public function canImpersonate(UserModel $user): bool
{
if ($this->owner->isGuest) {
return false;
}
return $this->owner->getIdentity()->canImpersonate($user);
}
/**
* @return bool True if this user is impersonated by admin currently
*/
public function getIsImpersonated(): bool
{
return $this->getImpersonator() !== null;
}
/**
* Get admin user who impersonate current user
*
* @return UserModel|null
*/
public function getImpersonator(): ?UserModel
{
if ($this->owner->isGuest) {
return null;
}
$impersonator = Yii::$app->session->get('impersonator');
if (!($impersonator instanceof UserModel)) {
return null;
}
if (!$impersonator->canImpersonate($this->owner->getIdentity())) {
return null;
}
return $impersonator;
}
/**
* Impersonate the given user with storing current user in session in order to sing in back
*
* @param UserModel $user
* @return bool
*/
public function impersonate(UserModel $user): bool
{
if (!$this->canImpersonate($user)) {
return false;
}
Yii::$app->session->set('impersonator', $this->owner->getIdentity());
$this->owner->switchIdentity($user);
return true;
}
/**
* Restore impersonator user from session
*
* @return bool
*/
public function restoreImpersonator(): bool
{
if (!($impersonator = $this->getImpersonator())) {
return false;
}
Yii::$app->session->remove('impersonator');
$this->owner->switchIdentity($impersonator);
return true;
}
}
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