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.devtools;
  
  import static java.net.HttpURLConnection.HTTP_OK;
  import static org.openqa.selenium.json.Json.MAP_TYPE;
  import static org.openqa.selenium.remote.http.Contents.string;
  import static org.openqa.selenium.remote.http.HttpMethod.GET;
  
  import java.io.UncheckedIOException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.Map;
  import java.util.Optional;
  import java.util.logging.Logger;
  import org.openqa.selenium.Capabilities;
  import org.openqa.selenium.internal.Require;
  import org.openqa.selenium.json.Json;
  import org.openqa.selenium.remote.http.ClientConfig;
  import org.openqa.selenium.remote.http.HttpClient;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  public class CdpEndpointFinder {
  
    private static final Logger LOG = Logger.getLogger(CdpEndpointFinder.class.getName());
    private static final Json JSON = new Json();
  
    public static HttpClient getHttpClient(HttpClient.Factory clientFactory, URI reportedUri) {
      Require.nonNull("HTTP client factory", clientFactory);
      Require.nonNull("DevTools URI", reportedUri);
  
      ClientConfig config = ClientConfig.defaultConfig().baseUri(reportedUri);
  
      return clientFactory.createClient(config);
    }
  
    public static Optional<URI> getCdpEndPoint(HttpClient client) {
      Require.nonNull("HTTP client", client);
  
      HttpResponse res;
      try {
        res = client.execute(new HttpRequest(GET, "/json/version"));
      } catch (UncheckedIOException e) {
        LOG.warning("Unable to connect to determine websocket url: " + e.getMessage());
        return Optional.empty();
      }
      if (res.getStatus() != HTTP_OK) {
        return Optional.empty();
      }
  
      Map<String, Object> versionData = JSON.toType(string(res), MAP_TYPE);
      Object raw = versionData.get("webSocketDebuggerUrl");
  
      if (!(raw instanceof String)) {
        return Optional.empty();
      }
  
      String debuggerUrl = (String) raw;
      try {
        return Optional.of(new URI(debuggerUrl));
      } catch (URISyntaxException e) {
        LOG.warning("Invalid URI for endpoint " + raw);
        return Optional.empty();
      }
    }
  
    public static Optional<URI> getReportedUri(Capabilities caps) {
      String key;
      switch (caps.getBrowserName()) {
        case "chrome":
          key = "goog:chromeOptions";
          break;
        case "msedge":
          key = "ms:edgeOptions";
          break;
        case "firefox":
          key = "moz:debuggerAddress";
          break;
        default:
          return Optional.empty();
      }
      return getReportedUri(key, caps);
    }
  
    public static Optional<URI> getReportedUri(String capabilityKey, Capabilities caps) {
      Object raw = caps.getCapability(capabilityKey);
  
      if ((raw instanceof Map)) {
        raw = ((Map<?, ?>) raw).get("debuggerAddress");
      }
  
      if (!(raw instanceof String)) {
        LOG.fine("No debugger address");
        return Optional.empty();
      }
  
      int index = ((String) raw).lastIndexOf(':');
      if (index == -1 || index == ((String) raw).length() - 1) {
        LOG.fine("No index in " + raw);
        return Optional.empty();
      }
  
      try {
        URI uri = new URI(String.format("http://%s", raw));
        LOG.fine("URI found: " + uri);
        return Optional.of(uri);
      } catch (URISyntaxException e) {
        LOG.warning("Unable to create URI from: " + raw);
        return Optional.empty();
      }
    }
  }
  