private OncePerRequestFilter createRedirectFilter()

in src/api-server/src/main/java/com/google/abmedge/apiserver/configuration/RedirectFilterConfiguration.java [58:86]

• 22 lines of code
• 5 McCabe index (conditional complexity)

  private OncePerRequestFilter createRedirectFilter() {
    //noinspection NullableProblems
    return new OncePerRequestFilter() {
      // Forwards all routes except '/index.html', '/200.html', '/favicon.ico', '/sw.js' '/api/',
      // '/api/**'
      private final String REGEX =
          "(?!/actuator|/api|/_nuxt|/static|/index\\.html|/200\\.html|/favicon\\.ico|/sw\\.js).*$";
      private final Pattern pattern = Pattern.compile(REGEX);

      @Override
      protected void doFilterInternal(
          HttpServletRequest req, HttpServletResponse res, FilterChain chain)
          throws ServletException, IOException {
        String uri = req.getRequestURI();
        if (pattern.matcher(uri).matches() && !uri.equals("/")) {
          // Delegate/Forward to `/` if `pattern` matches and it is not `/`
          // Read: https://github.com/jonashackt/spring-boot-vuejs#using-history-mode-for-nicer-urls
          if (!uri.endsWith("/ready") && !uri.endsWith("/healthy")) {
            // skip logging kube-proxy checks on /ready and /healthy
            LOGGER.info("URL {} entered directly into the Browser, redirecting...", uri);
          }
          RequestDispatcher rd = req.getRequestDispatcher("/");
          rd.forward(req, res);
        } else {
          chain.doFilter(req, res);
        }
      }
    };
  }