code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  package org.openqa.selenium.environment.webserver;
  
  import static org.openqa.selenium.build.InProject.locate;
  
  import java.io.UncheckedIOException;
  import java.nio.file.Path;
  import org.openqa.selenium.build.InProject;
  import org.openqa.selenium.grid.web.MergedResource;
  import org.openqa.selenium.grid.web.PathResource;
  import org.openqa.selenium.grid.web.Resource;
  import org.openqa.selenium.grid.web.ResourceHandler;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  import org.openqa.selenium.remote.http.Routable;
  import org.openqa.selenium.remote.http.Route;
  
  class CommonWebResources implements Routable {
  
    private final Routable delegate;
  
    public CommonWebResources() {
      Resource resources =
          new MergedResource(new PathResource(locate("common/src/web")))
              .alsoCheck(new PathResource(locate("javascript").getParent()).limit("javascript"))
              .alsoCheck(
                  new PathResource(locate("third_party/closure/goog").getParent()).limit("goog"))
              .alsoCheck(new PathResource(locate("third_party/js").getParent()).limit("js"));
  
      Path runfiles = InProject.findRunfilesRoot();
      if (runfiles != null) {
        ResourceHandler handler = new ResourceHandler(new PathResource(runfiles));
        delegate =
            Route.combine(
                new ResourceHandler(resources), Route.prefix("/filez").to(Route.combine(handler)));
      } else {
        delegate = new ResourceHandler(resources);
      }
    }
  
    @Override
    public boolean matches(HttpRequest req) {
      return delegate.matches(req);
    }
  
    @Override
    public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
      return delegate.execute(req);
    }
  }
  