Class GridUiRoute

java/src/org/openqa/selenium/grid/web/GridUiRoute.java:37–101

import org.openqa.selenium.remote.http.Route;

public class GridUiRoute implements Routable {

  private static final Logger LOG = Logger.getLogger("selenium");

  private static final String GRID_RESOURCE = "grid-ui";
  private static final String GRID_RESOURCE_WITH_PREFIX = String.format("/%s", GRID_RESOURCE);

  private final Route routes;

  public GridUiRoute(String prefix) {
    Require.nonNull(prefix, "Prefix cannot be null");
    URL uiRoot = GridUiRoute.class.getResource(GRID_RESOURCE_WITH_PREFIX);
    if (uiRoot != null) {
      ResourceHandler uiHandler = new ResourceHandler(new ClassPathResource(uiRoot, GRID_RESOURCE));
      HttpResponse uiRedirect =
          new HttpResponse()
              .setStatus(HTTP_MOVED_TEMP)
              .addHeader("Location", prefix.concat("/ui/"));

      Supplier<HttpHandler> redirectHandler = () -> req -> uiRedirect;

      Routable appendRoute =
          Route.combine(consoleRoute(prefix, redirectHandler), uiRoute(prefix, () -> uiHandler));
      if (!prefix.isEmpty()) {
        appendRoute = Route.combine(appendRoute, redirectRoute(prefix, redirectHandler));
      }

      routes = Route.combine(get("/").to(redirectHandler), appendRoute);
    } else {
      LOG.warning("It was not possible to load the Grid UI.");
      Json json = new Json();
      routes = Route.matching(req -> false).to(() -> new NoHandler(json));
    }
  }

  @Override
  public boolean matches(HttpRequest req) {
    return routes.matches(req);
  }

  @Override
  public HttpResponse execute(HttpRequest req) {
    return routes.execute(req);
  }

  private static Routable uiRoute(String prefix, Supplier<HttpHandler> handler) {
    return buildRoute(
        "/ui", prefix, path -> Route.prefix(path).to(Route.matching(req -> true).to(handler)));
  }

  private static Routable consoleRoute(String prefix, Supplier<HttpHandler> handler) {
    return buildRoute("/grid/console", prefix, path -> get(path).to(handler));
  }

  private static Routable buildRoute(String url, String prefix, Function<String, Route> mapper) {
    List<String> subPaths =
        prefix.isEmpty() ? Collections.singletonList(url) : List.of(prefix + url, url);
    return subPaths.stream().map(mapper).reduce(Route::combine).get();