/*
 * #%L
 * Alfresco Repository WAR Community
 * %%
 * Copyright (C) 2005 - 2016 Alfresco Software Limited
 * %%
 * This file is part of the Alfresco software. 
 * If the software was purchased under a paid Alfresco license, the terms of 
 * the paid license agreement will prevail.  Otherwise, the software is 
 * provided under the following open source license terms:
 * 
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */
package org.alfresco.web.bean.ajax;

import java.io.IOException;
import java.io.Serializable;
import java.util.Map;

import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

import org.alfresco.repo.content.MimetypeMap;
import org.alfresco.web.app.servlet.ajax.InvokeCommand;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Bean which proxies requests to online presence servers.
 * 
 * @author Mike Hatfield
 */
public class PresenceProxyBean implements Serializable
{
   private static final long serialVersionUID = -3041576848188629589L;
   
   private static Log logger = LogFactory.getLog(PresenceProxyBean.class);
   
   @InvokeCommand.ResponseMimetype(value=MimetypeMap.MIMETYPE_HTML)
   public void proxyRequest() throws Exception
   {
      FacesContext fc = FacesContext.getCurrentInstance();
      ResponseWriter out = fc.getResponseWriter();
      
      Map<String, String> requestMap = fc.getExternalContext().getRequestParameterMap();
      String url = (String)requestMap.get("url");
      
      if (logger.isDebugEnabled())
         logger.debug("PresenceProxyBean.proxyRequest() url=" + url);
      
      if (url != null)
      {
         String response = getUrlResponse(url);
         out.write(response);
      }
   }

   /**
    * Perform request
    */
   public String getUrlResponse(String requestUrl)
   {
      String response = "";
      HttpClient client = new HttpClient();
      HttpMethod method = new GetMethod(requestUrl);
      method.setRequestHeader("Accept", "*/*");
      client.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
      try
      {
         int statusCode = client.executeMethod(method);
         if (statusCode == HttpStatus.SC_OK)
         {
            response = method.getResponseBodyAsString();
         }
         else
         {
            response = method.getStatusText();
         }
      }
      catch (HttpException e)
      {
         response = e.getMessage();
      }
      catch (IOException e)
      {
         response = e.getMessage();
      }
      finally
      {
         // Release the connection.
         method.releaseConnection();
      }
      
      return response;
   }
}