FacebookLogInAndForwarding.java

package kr.ac.kaist.resl.lilliput.core;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;

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

import kr.ac.kaist.resl.lilliput.util.MongoHelper;

import org.apache.commons.io.IOUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.restfb.Connection;
import com.restfb.DefaultFacebookClient;
import com.restfb.FacebookClient;
import com.restfb.types.Account;
import com.restfb.types.User;

/**
 * Servlet implementation class FacebookLogInAndForwarding
 */
public class FacebookLogInAndForwarding extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FacebookLogInAndForwarding() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String name = (String)request.getParameter("name");
		String accessToken = (String)request.getParameter("accessToken");
		String result = getRegistrationStatus(accessToken, name);
		request.setAttribute("result", result);
		RequestDispatcher dispatcher = request.getRequestDispatcher("registration.jsp");
		dispatcher.forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	public String getRegistrationStatus(String accessToken, String name)
	{
		try
		{
			JSONObject returnJson = new JSONObject();
			returnJson.put("UserAC", accessToken);
			returnJson.put("UserName", name);
			JSONObject returnHuman = new JSONObject();
			//making facebookClient
			FacebookClient facebookClient = new DefaultFacebookClient(accessToken);
			
			//fetch user
			User user = facebookClient.fetchObject("me", User.class);
			
			MongoHelper mHelper = new MongoHelper();
			//Check whether human is already saved
			String objectIdOfDB = mHelper.isHumanSavedInDB(user.getId());
			
			if( objectIdOfDB == null )
			{
				returnHuman.put("isSaved", "false");
			}
			else
			{
				returnHuman.put("isSaved", "true");
				JSONObject ret = mHelper.getInformationUsingFID("HumanInformation", user.getId());
				JSONObject ret2 = mHelper.getInformationUsingFID("EPCStorage", user.getId());
				if( ret.isNull("SyncTime") != true ) returnHuman.put("SyncTime", ret.getString("SyncTime"));
				if( ret2.isNull("epc") != true ) returnHuman.put("epc", ret2.getString("epc"));
			}
			returnJson.put("Human", returnHuman);
			
			//fetch Pages
			Connection<Account> myPageConnections = facebookClient.fetchConnection("me/accounts", Account.class);
			List<Account> myPages = myPageConnections.getData();
			JSONArray pages = new JSONArray();
			for(int i = 0 ; i < myPages.size() ; i ++ )
			{
				JSONObject pageJson = new JSONObject();
				Account tempAcc = myPages.get(i);
				if( tempAcc.getCategory().equals("Application"))
				{
					if( tempAcc.getName().equals("Lilliput-Jack") )
					{
						URL url = new URL("https://graph.facebook.com/oauth/access_token?client_id=136511403124173&client_secret=6d2d602142b59b0df5738c7a151c66cf&grant_type=client_credentials");
						URLConnection con = url.openConnection();
						InputStream in = con.getInputStream();
						String encoding = con.getContentEncoding();
						encoding = encoding == null ? "UTF-8" : encoding;
						String body = IOUtils.toString(in, encoding);
						String[] tokens = body.split("=");				
						returnJson.put("appAC", tokens[1]);
						returnJson.put("appID", tempAcc.getId());
						returnJson.put("appName", tempAcc.getName());
					}				
					continue;
				}
				String tname = tempAcc.getName();
				String PageaccessToken = tempAcc.getAccessToken();
				String id = tempAcc.getId();
				pageJson.put("name", tname);
				pageJson.put("access_token", PageaccessToken);
				pageJson.put("id", id);
				pages.put(pageJson);
			}
			JSONArray registratedObject = new JSONArray();
			JSONArray registratedPlace = new JSONArray();
			JSONArray notRegistrated = new JSONArray();
			
			for(int i = 0 ; i < pages.length() ; i++ )
			{
				JSONObject tempPage = pages.getJSONObject(i);
				String uid = mHelper.isSavedInDB("EPCStorage", "fid", tempPage.getString("id"));
				if( uid == null )//not registrated
				{
					notRegistrated.put(tempPage);
				}
				else
				{	//urn:epc:id:sgtin:
					//urn:epc:id:sgln:
					String[] flags = uid.split(":");
					if( flags.length < 4)
					{
						System.out.println( "Unexpected Error Occured : Abnormal EPC is stored in DB");
						continue;
					}
					if( flags[3].equals("sgtin"))	//object
					{
						JSONObject ret = mHelper.getInformationUsingFID("ObjectInformation", tempPage.getString("id"));
						if( ret.isNull("SyncTime") != true ) tempPage.put("SyncTime", ret.getString("SyncTime"));
						if( ret.isNull("epc") != true ) tempPage.put("epc", ret.getString("epc"));
						registratedObject.put(tempPage);
					}
					else if( flags[3].equals("sgln"))	//place
					{
						JSONObject ret = mHelper.getInformationUsingFID("SpaceInformation", tempPage.getString("id"));
						if( ret.isNull("SyncTime") != true ) tempPage.put("SyncTime", ret.getString("SyncTime"));
						if( ret.isNull("epc") != true ) tempPage.put("epc", ret.getString("epc"));
						registratedPlace.put(tempPage);
					}
				}
			}
			returnJson.put("RegistratedObject", registratedObject);
			returnJson.put("RegistratedPlace", registratedPlace);
			returnJson.put("NotRegistrated", notRegistrated);
			System.out.println("ddd");
			return returnJson.toString();
		}
		catch( JSONException e)
		{
			return e.toString();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return e.toString();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return e.toString();
		}
	}
	
}