/**
* 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.jobs;
import org.apache.ambari.view.ViewContext;
import org.apache.ambari.view.HttpImpersonator;
import org.apache.ambari.view.ImpersonatorSetting;
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;
/**
* Simple servlet for proxying requests with doAs impersonation.
*/
public class ProxyServlet extends HttpServlet {
private ViewContext viewContext;
private HttpImpersonator impersonator;
private ImpersonatorSetting impersonatorSetting;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContext context = config.getServletContext();
viewContext = (ViewContext) context.getAttribute(ViewContext.CONTEXT_ATTRIBUTE);
this.impersonator = viewContext.getHttpImpersonator();
this.impersonatorSetting = viewContext.getImpersonatorSetting();
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
String urlToRead = request.getParameter("url");
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
// Getting the result is super simple by using the impersonator and the default values in the factory.
String result = this.impersonator.requestURL(urlToRead, "GET", this.impersonatorSetting);
PrintWriter writer = response.getWriter();
writer.print(result);
}
}