EmailThreadContextInterceptor.java

@Component
public class EmailThreadContextInterceptor implements HandlerInterceptor {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    AccessToken accessToken;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        if(httpServletRequest.getMethod().equals(HttpMethod.OPTIONS.name())) {
            return true;
        }

        Enumeration<String> reqHeaders = httpServletRequest.getHeaderNames();
        Set<String> headers = new HashSet<>();
        while(reqHeaders.hasMoreElements()){
            headers.add(reqHeaders.nextElement().toLowerCase());
        }
        if(headers.contains(HttpHeaders.AUTHORIZATION.toLowerCase())) {
            MDC.put("userEmail", String.format("%s", accessToken.getEmail()));
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        logger.debug("post handle hook");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        logger.debug("Clearing ThreadContext data");
        MDC.clearAll();
    }
}