org.openqa.selenium.grid.server.W3CCommandHandler Maven / Gradle / Ivy

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// 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
//
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package org.openqa.selenium.grid.server;

import static com.google.common.net.MediaType.JSON_UTF_8;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.collect.ImmutableMap;

import org.openqa.selenium.grid.web.CommandHandler;
import org.openqa.selenium.json.Json;
import org.openqa.selenium.remote.ErrorCodes;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

import java.io.IOException;
import java.util.Objects;

public class W3CCommandHandler implements CommandHandler {

  public static final Json JSON = new Json();
  private final ErrorCodes errors = new ErrorCodes();
  private final CommandHandler delegate;

  public W3CCommandHandler(CommandHandler delegate) {
    this.delegate = Objects.requireNonNull(delegate);
  }

  @Override
  public void execute(HttpRequest req, HttpResponse resp) throws IOException {
    // Assume we're executing a normal W3C WebDriver request
    resp.setHeader("Content-Type", JSON_UTF_8.toString());
    resp.setHeader("Cache-Control", "none");

    try {
      delegate.execute(req, resp);
    } catch (Throwable cause) {
      // Fair enough. Attempt to convert the exception to something useful.
      resp.setStatus(errors.getHttpStatusCode(cause));

      resp.setHeader("Content-Type", JSON_UTF_8.toString());
      resp.setHeader("Cache-Control", "none");

      resp.setContent(JSON.toJson(
          ImmutableMap.of(
              "status", errors.toStatusCode(cause),
              "value", cause)).getBytes(UTF_8));
    }
  }
}