/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.ambari.view.storm;
import org.apache.ambari.view.ViewContext;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.io.*;
/**
* Simple servlet for proxying requests with doAs impersonation.
*/
public class StormDetailsServlet extends HttpServlet {
private ViewContext viewContext;
private static final String STORM_HOST = "storm.host";
private static final String STORM_PORT = "storm.port";
private static final String STORM_SSL_ENABLED = "storm.sslEnabled";
private String stormURL;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContext context = config.getServletContext();
viewContext = (ViewContext) context.getAttribute(ViewContext.CONTEXT_ATTRIBUTE);
String sslEnabled = viewContext.getProperties().get(STORM_SSL_ENABLED);
String hostname = viewContext.getProperties().get(STORM_HOST);
String port = viewContext.getProperties().get(STORM_PORT);
stormURL = (sslEnabled.equals("true") ? "https" : "http") + "://" + hostname + ":" + port;
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
String hostDetails = "{\"hostdata\":\""+stormURL+"\"}";
InputStream resultStream = new ByteArrayInputStream(hostDetails.getBytes(StandardCharsets.UTF_8));
this.setResponse(request, response, resultStream);
}
/**
* Set response to the get/post request
* @param request HttpServletRequest
* @param response HttpServletResponse
* @param resultStream InputStream
*/
public void setResponse(HttpServletRequest request, HttpServletResponse response, InputStream resultStream) throws IOException{
Scanner scanner = new Scanner(resultStream).useDelimiter("\\A");
String result = scanner.hasNext() ? scanner.next() : "";
Boolean notFound = result == "" || result.indexOf("\"exception\":\"NotFoundException\"") != -1;
response.setContentType(request.getContentType());
response.setStatus(notFound ? HttpServletResponse.SC_NOT_FOUND : HttpServletResponse.SC_OK);
PrintWriter writer = response.getWriter();
writer.print(result);
}
}