fast.servicescreen.server.RequestServlet.java Source code

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Here is the source code for fast.servicescreen.server.RequestServlet.java

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/**
 * Copyright (c) 2008-2011, FAST Consortium
 * 
 * This file is part of FAST Platform.
 * 
 * FAST Platform is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * FAST Platform 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 Affero General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with FAST Platform. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Info about members and contributors of the FAST Consortium
 * is available at http://fast.morfeo-project.eu
 *
 **/
package fast.servicescreen.server;

import java.io.IOException;

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

import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;

import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

/**
 * Stand alone proxy servlet. Accessible in JavaScript runtime
 * 
 * TODO dk remove, if FASTApit works fine!
 * */
@SuppressWarnings("serial")
@RemoteServiceRelativePath("\requestServlet")
public class RequestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //get the URL out of the requests parameter and form escape codes back to a real URL
        String url = req.getParameter("url");

        if (url != null && !"".equals(url)) {
            //execute a GET call with the params URL
            String value = sendHttpRequest_GET(url);

            // to facilitate debugging strip xslt tag
            // value = value.replaceFirst("<\\?xml-stylesheet type=\"text/xsl\" href=\"http://ergast.com/schemas/mrd-1.1.xsl\"\\?>", "");

            //attach the responses output stream
            ServletOutputStream out = resp.getOutputStream();

            //write the GET result into the response (this will trigger
            //the forward to the original transmitter)
            byte[] outByte = value.getBytes("utf-8");
            out.write(outByte);
            out.flush();
            out.close();
        }
    }

    /**
     * This mehtod perform a GET Request 
     * */
    public String sendHttpRequest_GET(String url) {
        String responseBody = "";

        // create httpClient and httpGET container
        HttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(url);

        // Create response handler
        ResponseHandler<String> responseHandler = new BasicResponseHandler();

        try {
            // send the GET request
            responseBody = httpclient.execute(httpget, responseHandler);
        } catch (Exception e) {
            e.printStackTrace();
            responseBody = "-42";
        }
        return responseBody;
    }
}