org.openqa.grid.web.servlet.DisplayHelpServlet Maven / Gradle / Ivy

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// 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.grid.web.servlet;

import com.google.common.io.ByteStreams;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.jar.Manifest;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DisplayHelpServlet extends HttpServlet {
  private static final long serialVersionUID = 8484071790930378855L;
  private static final Logger log = Logger.getLogger(DisplayHelpServlet.class.getName());
  private static String coreVersion;

  public DisplayHelpServlet() {
    getVersion();
  }


  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    process(request, response);
  }

  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    process(request, response);
  }

  protected void process(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");
    response.setStatus(200);

    StringBuilder builder = new StringBuilder();

    builder.append("");
    builder.append("");

    builder.append("Selenium Grid ").append(coreVersion).append(" help");


    builder.append("");

    builder.append("");
    builder.append("You are using grid ").append(coreVersion);
    builder
        .append("
Find help on the official selenium wiki : more help here");
    builder.append("
default monitoring page : console");

    builder.append("");
    builder.append("");

    InputStream in = new ByteArrayInputStream(builder.toString().getBytes("UTF-8"));
    try {
      ByteStreams.copy(in, response.getOutputStream());
    } finally {
      in.close();
      response.flushBuffer();
    }
  }

  private void getVersion() {
    InputStream stream = null;
    try {
      String classPath = this.getClass().getResource(this.getClass().getSimpleName() + ".class").toString();
      String manifest = classPath.substring(0, classPath.lastIndexOf("!") + 1) + "/META-INF/MANIFEST.MF";
      stream = new URL(manifest).openStream();
    } catch (Exception e) {
      e.printStackTrace();
    }
    if (stream == null) {
      log.severe("Couldn't determine version number");
      return;
    }
    try {
      Manifest manifest = new Manifest(stream);
      coreVersion = manifest.getEntries().get("Build-Info").getValue("Selenium-Version").trim();
    } catch (IOException e) {
      log.severe("Cannot load version from VERSION.txt" + e.getMessage());
    }
  }
}