FacebookCallback.java

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

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

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.User;

import edu.stanford.smi.protege.model.Project;
import edu.stanford.smi.protege.server.RemoteProjectManager;
import edu.stanford.smi.protegex.owl.model.OWLModel;
import edu.stanford.smi.protegex.owl.model.OWLObjectProperty;
import edu.stanford.smi.protegex.owl.model.RDFIndividual;

/**
 * Servlet implementation class FacebookCallback
 */
public class FacebookCallback extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FacebookCallback() {
        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
		System.out.println();
		PrintWriter out = response.getWriter();
		//String mode = (String)request.getParameter("hub.mode");
		String challenge = (String)request.getParameter("hub.challenge");
		String verify_token = (String)request.getParameter("hub.verify_token");
		if( verify_token.equals("123"))
		{
			out.print(challenge);
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println();
		try{
			StringBuilder sb = new StringBuilder();
			String s;
			while ((s = request.getReader().readLine()) != null) { 
				sb.append(s); 
            } 		
			System.out.println(sb.toString());
			
			JSONObject reqObj = new JSONObject(sb.toString());
			keepConsistencyWithFacebook(reqObj);
			
			
		}catch(Exception e)
		{
			
		}
	}
	
	public void keepConsistencyWithFacebook(JSONObject fbObj)
	{
		try{
			@SuppressWarnings("unused")
			String object = fbObj.getString("object");
			JSONArray entries = fbObj.getJSONArray("entry");
			for(int i = 0 ; i < entries.length() ; i ++ )
			{
				JSONObject entry = entries.getJSONObject(i);
				String uid = entry.getString("uid");
				changeFriendship(uid);
			}
		}catch( JSONException e )
		{
			
		}
	}
	
	public void changeFriendship(String uid)
	{
		String appAC = getAppAC();
		//making facebookClient
		FacebookClient facebookClient = new DefaultFacebookClient(appAC);
		
		Connection<User> myFriendConnections = facebookClient.fetchConnection(uid+"/friends", User.class);
		List<User> myFriends = myFriendConnections.getData();
		System.out.println("my Friends");
		
		//Ontology�� �ҷ���
		RemoteProjectManager rpm = RemoteProjectManager.getInstance();
		Project p = rpm.getProject("localhost:5100", "Lilliput", "1234", "IoTSocialGraph", true);
		OWLModel owlModel = (OWLModel)p.getKnowledgeBase();
		
		OWLObjectProperty hasFriend = owlModel.getOWLObjectProperty("hasFriend");
		MongoHelper mHelper = new MongoHelper();
		//���� ������
		String myEpc = mHelper.isHumanSavedInDB(uid);
		RDFIndividual myInd = owlModel.getRDFIndividual(myEpc);
		if( myInd == null )
		{
			return ;
		}
		//������ Graph������ ����
		@SuppressWarnings("rawtypes")
		Collection friendCol = myInd.getPropertyValues(hasFriend);
		@SuppressWarnings("rawtypes")
		Iterator friendIter = friendCol.iterator();
		List<String> prevConnect = new ArrayList<String>();
		while( friendIter.hasNext())
		{
			RDFIndividual friendRDF = (RDFIndividual)friendIter.next();
			prevConnect.add(friendRDF.getBrowserText());
		}
		//���� ����� epc�Ϸ�
		//�ֽ� ����� �͵��� ������
		List<String> currConnect = new ArrayList<String>();
		for(int i = 0 ; i < myFriends.size() ; i++ )
		{
			String tfid = myFriends.get(i).getId();
			String friendEPC = mHelper.isHumanSavedInDB(tfid);
			if(friendEPC != null )
			{
				currConnect.add(friendEPC);
			}
		}

		for(int i = 0 ; i < currConnect.size() ; i++)
		{
			String currStr = currConnect.get(i);
			if( prevConnect.contains(currStr))
			{
				continue;
			}
			else
			{	//���� ����Ǿ� �ϴµ� �������� ���ٸ� ���Ӱ� ������� �־�� �Ѵ�.
				RDFIndividual friendInd = owlModel.getRDFIndividual(currStr);
				myInd.addPropertyValue(hasFriend, friendInd);			
			}			
		}
		
		for(int i = 0 ; i < prevConnect.size() ; i++)
		{
			String prevStr = prevConnect.get(i);
			if( currConnect.contains(prevStr))
			{
				continue;
			}
			else
			{
				//������ ����Ǿ� �־�����, ���翡 ���ٸ� ��������
				RDFIndividual friendInd = owlModel.getRDFIndividual(prevStr);
				myInd.removePropertyValue(hasFriend, friendInd);			
			}			
		}		
	}
	
	
	public String getAppAC()
	{
		
		try {
			URL 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("=");				
			return tokens[1];
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

}