to.networld.fbtosemweb.ws.FOAFExporter.java Source code

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Here is the source code for to.networld.fbtosemweb.ws.FOAFExporter.java

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/**
 * cas-webservice - to.networld.fbtosemweb.ws
 *
 * Copyright (C) 2011 by Networld Project
 * Written by Alex Oberhauser <oberhauseralex@networld.to>
 * All Rights Reserved
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation, version 3 of the License.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software.  If not, see <http://www.gnu.org/licenses/>
 */

package to.networld.fbtosemweb.ws;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.json.JSONException;

import to.networld.fbtosemweb.FacebookToFOAF;
import to.networld.fbtosemweb.fb.FacebookAgentHandler;
import to.networld.fbtosemweb.ws.common.SessionHandler;

/**
 * @author Alex Oberhauser
 */
public class FOAFExporter extends HttpServlet {
    private static final long serialVersionUID = -3661916073684192857L;

    @Override
    public void doGet(HttpServletRequest _request, HttpServletResponse _response)
            throws ServletException, IOException {
        String access_token = SessionHandler.getAccessToken(_request);
        if (access_token == null) {
            access_token = (String) _request.getParameter("access_token");
            if (access_token == null) {
                _response.sendRedirect(".");
                return;
            } else {
                access_token = "access_token=" + access_token;
            }
        }

        PrintWriter out = _response.getWriter();

        try {
            FacebookAgentHandler currentAgentHandler = new FacebookAgentHandler(access_token);
            FacebookToFOAF foafFile = new FacebookToFOAF(currentAgentHandler);
            _response.setCharacterEncoding("UTF-8");
            _response.setContentType("application/rdf+xml; charset=UTF-8");
            _response.setHeader("Content-Disposition", "attachment; filename=foaf.rdf");
            out.println(foafFile);
        } catch (JSONException e) {
            out.println(e.getLocalizedMessage());
            _response.setStatus(500);
        }
    }
}