Laravel-Passport-getToken

use App\Models\User;
use Carbon\Carbon;
use Illuminate\Events\Dispatcher;
use Laravel\Passport\Bridge\AccessTokenRepository;
use Laravel\Passport\Bridge\Client;
use Laravel\Passport\Bridge\Scope;
use Laravel\Passport\TokenRepository;
use League\OAuth2\Server\CryptKey;
use Laravel\Passport\Bridge\AccessToken;

/**
 * Get custom Token from Passpord 
 * @param User $user
 * @param int $expireTime
 * @return array
 */
function getToken(User $user,int $expireTime = 3600){
    $token = new AccessToken($user->id);
    $token->setIdentifier(generateUniqueIdentifier());
    $token->setClient(new Client(2, null, null));
    $token->setExpiryDateTime(Carbon::now()->addSeconds($expireTime));
    $token->addScope(new Scope('activity'));
    $privateKey = new CryptKey('file://'.storage_path('oauth-private.key'));

    $accessTokenRepository = new AccessTokenRepository(new TokenRepository, new Dispatcher);
    $accessTokenRepository->persistNewAccessToken($token);


    $jwtAccessToken = $token->convertToJWT($privateKey);
    $user_arr = $user->toArray();
    /*
    * Add params to $user_arr
    */
    return [
        'token_type'   => 'Bearer',
        'expires_in'   => $expireTime,
        'access_token' => (string) $jwtAccessToken,
        'user'         => $user_arr
    ];
}


/**
 * Get unique Token Id
 * @param int $length
 * @return string
 */
function generateUniqueIdentifier($length = 40)
{
    try {
        $id = bin2hex(random_bytes($length));
        if(DB::table('oauth_access_tokens')->where('id',$id)->exists()){
            return $this->generateUniqueIdentifier($length);
        }
        return $id;
    }catch (\Exception $e) {
        return $this->generateUniqueIdentifier($length);
    }
}