public async use (@Req() req: Req, @EndpointInfo() endpoint: EndpointInfo) {
        // const options = endpoint.get(FirebaseAuth) || {};
        const token: string = this.getToken(req);
        try {
            await this.app.auth().verifyIdToken(token)
        } catch (e) {
            $log.error(e);
            throw(new Unauthorized('Decoding token failed'));
        }

    }

    private getToken(req: Req): string {
        if (req.headers.authorization  && req.headers.authorization.split(' ')[0] === 'Bearer') {
            return req.headers.authorization.split(' ')[1];
        }
        $log.error('Token not found');
        throw(new Unauthorized('Token not found'));
    }