Java e Facebook Login

[macking]

Sto realizzando un'applicazione in java che deve inserire i dati di facebook di un utente in un database mysql. L'applicazione è client-server e lo scambio dei dati avviene tramite socket realizzate ad-hoc. Il problema è che non riesco a trovare il modo di far loggare l'utente. Come potrei gestire l'integrazione tra java e facebook? Ho trovato sul web una classe che posterò più in basso, ma non so cos'è che faccia esattamente. P.S. l'applicazione non è una web-application, ma un'applicazione standard java con GUI Swing.

import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Vector;


public class PluginFacebook {

	Vector arrCookie;
	String email;
	String password;
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		PluginFacebook.CreateAndConnectAndLogin( "-email-" , "-password-" );

	}
	
	public PluginFacebook(String emailInput, String passwordInput)
	{
		this.email = emailInput;
		this.password = passwordInput;
		
		arrCookie = new Vector();
		
	}
	
	public String Cookie2String()
	{
		String strOut = "";
		String param = "";
		
		for(int k=0;k<arrCookie.size();k++)
		{
			param = (String) arrCookie.get(k);
			if (strOut == "") {
				strOut = param;
			} else {
				strOut = strOut + ";" + param;
			}
		}
		
		return strOut;
	}
	
	
	public static PluginFacebook CreateAndConnectAndLogin(String emailInput, String passwordInput)
	{
		PluginFacebook outObj = new PluginFacebook(emailInput, passwordInput);
		
		outObj.MakeCompleteConnection();
		
		return outObj;
	}
	
	private String ParseLoginFormAction(String htmlFacebook)
	{
		String strOut = "";

		int pos;
		String strDaElaborare;
		int posStartForm = htmlFacebook.indexOf("<form ");
		int posEndForm = htmlFacebook.indexOf("</form>");
		
		strDaElaborare = htmlFacebook.substring(posStartForm, posEndForm);

		int posTemp1 = strDaElaborare.indexOf("action=\"", 0);
		int posTemp2;
		if (posTemp1 != -1)
		{
			posTemp1 += 8;
			posTemp2 = strDaElaborare.indexOf("\"", posTemp1);
			
			strOut = strDaElaborare.substring(posTemp1, posTemp2);
		}		
		
		return strOut;
	}
	
	private Hashtable ParseLoginForm(String htmlFacebook)
	{
		String strDaElaborare;
		int posStartForm = htmlFacebook.indexOf("<form ");
		int posEndForm = htmlFacebook.indexOf("</form>");
		
		strDaElaborare = htmlFacebook.substring(posStartForm, posEndForm);
		
		Hashtable  hm = new Hashtable ();
		
		// Cerca il tag a e l'attributo href
		int pos = 0;
		int posTemp1 = 0;
		int posTemp2 = 0;
		
		int posTagInputStart=0;
		int posTagInputEnd=0;
		String htmlTagInput;
		
		String tagInputNome;
		String tagInputValore;
		
		while (pos != -1)
		{
			posTagInputStart = strDaElaborare.indexOf("<input ", pos);
			System.out.println("pos = "+pos+" - posStart = "+posTagInputStart);
			if (posTagInputStart!=-1)
			{
				posTagInputEnd = strDaElaborare.indexOf(">", posTagInputStart);
				if ((posTagInputEnd>posTagInputStart)&&(posTagInputStart!=-1))
				{
					htmlTagInput = strDaElaborare.substring(posTagInputStart, posTagInputEnd);
				}
				else
				{
					htmlTagInput = "";
					
				}
			}
			else
			{
				htmlTagInput = "";
				posTagInputEnd = -1;
			}
			
			if (htmlTagInput != "")
			{
				
				posTemp1 = htmlTagInput.indexOf("name=\"", 0);
				if (posTemp1 != -1)
				{
					posTemp1 += 6;
					posTemp2 = htmlTagInput.indexOf("\"", posTemp1);
					tagInputNome = htmlTagInput.substring(posTemp1, posTemp2);
					posTemp1 = htmlTagInput.indexOf("value=\"", 0);
					if (posTemp1 != -1)
					{
						posTemp1 += 7;
						posTemp2 = htmlTagInput.indexOf("\"", posTemp1);
						tagInputValore = htmlTagInput.substring(posTemp1, posTemp2);
					
						hm.put(tagInputNome, tagInputValore);
					}
				}
				
			}
			pos = posTagInputEnd;
		}	
		
		return hm;
	}
	
	
	 public void Login(String actionUrl, Hashtable parameters) 
	 {

			String location = "";
	
			HttpURLConnection httpConn = null;
	
			String url = actionUrl;
			
			InputStream is = null;
			OutputStream os = null;
	
			String key;
			String value;
			String param;
			String dataPOST = "";
			Enumeration keys = parameters.keys();
			while (keys.hasMoreElements()) {
				key = (String) keys.nextElement();
				value = (String) parameters.get(key);
				param = key + "=" + value;
				if (dataPOST == "") {
					dataPOST = param;
				} else {
					dataPOST = dataPOST + "&" + param;
				}
			}
	
			System.out.println("dataPOST:");
			System.out.println(dataPOST);
	
			try {
	
				// Open an HTTP Connection object
				URL urlObject = new URL(url);
				httpConn = (HttpURLConnection) urlObject.openConnection();
				
				// Setup HTTP Request to POST
				httpConn.setRequestMethod("POST");
				
				String cookie = this.Cookie2String();
	
				httpConn.setRequestProperty("Content-Type",	"application/x-www-form-urlencoded");
				httpConn.setRequestProperty("Content-Length",String.valueOf(dataPOST.length()));
				httpConn.setRequestProperty("User-Agent","Profile/MIDP-2.0 Configuration/CLDC-1.1");
				httpConn.setRequestProperty("Accept-Charset", "UTF-8;q=0.7,*;q=0.7");
				httpConn.setRequestProperty("Accept-Encoding", "gzip, deflate");
				httpConn.setRequestProperty("Accept","text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5");
				httpConn.setRequestProperty("Cookie", cookie);
	
				httpConn.setDoOutput(true);
				os = httpConn.getOutputStream();
				os.write(dataPOST.getBytes());
	
				/**
				 * Caution: os.flush() is controversial. It may create unexpected
				 * behavior on certain mobile devices. Try it out for your mobile
				 * device
				 **/
	
				// os.flush();
	
				// Read Response from the Server
	
				StringBuffer sb = new StringBuffer();
				is = httpConn.getInputStream();
				int chr;
				while ((chr = is.read()) != -1)
					sb.append((char) chr);
	
				System.out.println("RETURN FACEBOOK LOGIN");
				System.out.println(sb.toString());
	
				location = httpConn.getHeaderField("Location");
				System.out.println("Location: " + location);
	
				EstraiCookie(httpConn);
	
				// Web Server just returns the birthday in mm/dd/yy format.
				// System.out.println(name+"'s Birthday is " + sb.toString());
				if (is != null)
					is.close();
				if (os != null)
					os.close();
				if (httpConn != null)
					httpConn.disconnect();
	
			} catch (Exception excp) {
				excp.printStackTrace();
			}
	
			if (location != "") {
				this.HandleRedirect(location);
			}
	    }	
	 
		public void HandleRedirect(String url)
		{
			String location = "";
			StringBuffer buffer = new StringBuffer();
			int chi;
			try
			{
				String cookie = this.Cookie2String();
				URL urlObj = new URL(url);
				HttpURLConnection hc = (HttpURLConnection)urlObj.openConnection();
				hc.setRequestProperty("Cookie", cookie);
				
				String s = hc.getResponseMessage();
				
				System.out.println("Cookie:");
				System.out.println(cookie);
				
				EstraiCookie(hc);
				
				
				int rc = hc.getResponseCode();
				
				if (rc==302)
				{
					location = hc.getHeaderField("Location");
				}
				
				if (hc.getResponseCode() == 200)
				{
					InputStream is = hc.getInputStream();
					
					do
					{
						chi = is.read();
						if (chi!=-1)
						{
							buffer.append((char)chi);
						}
					}while(chi!=-1);
					
					is.close();
				}
				
				
				hc.disconnect();
			}
			catch (Exception excp)
			{
				excp.printStackTrace();
			}
			
			System.out.println(buffer.toString());
			
			if (location != "")
			{
				this.HandleRedirect(location);
			}
		}	 
	
		public void EstraiCookie(HttpURLConnection hc)
		{
			String cookieTemp = "";
			String field = "";
			String headerName=null;
			Map<String, List<String>> m = hc.getHeaderFields();

			try
			{
				for (int i=1; hc.getHeaderField(i)!=null; i++) 
				{
					headerName = hc.getHeaderFieldKey(i);
				 	if (headerName.equals("Set-Cookie")) {                  
				 		field = hc.getHeaderField(i);
				 		cookieTemp = field.substring(0,field.indexOf(";"));
				 		System.out.println("cookieTemp="+cookieTemp);
				 		
				 		if(!this.arrCookie.contains(cookieTemp))
				 		{
				 			this.arrCookie.add(cookieTemp);
				 		}
				 		
				 	}
				}
			}
			catch(Exception excp)
			{
				excp.printStackTrace();
			}
			
		}
		
	public void MakeCompleteConnection()
	{
		StringBuffer buffer = new StringBuffer();
		int chi;
		try
		{
			long msInizio = System.currentTimeMillis();
			System.out.println("Inizio: "+msInizio);
			
			URL urlObj = new URL("http://m.facebook.com");
			HttpURLConnection hc = (HttpURLConnection) urlObj.openConnection();
			
			EstraiCookie(hc);
			
			
			String s = hc.getResponseMessage();
			
			if (hc.getResponseCode() == 200)
			{
				InputStream is = hc.getInputStream();
				
				do
				{
					chi = is.read();
					if (chi!=-1)
					{
						buffer.append((char)chi);
					}
				}while(chi!=-1);
				
				is.close();
			}
			
			
			long msFine = System.currentTimeMillis();
			System.out.println("Fine: "+msFine);
			
	
			hc.disconnect();
		}
		catch (Exception excp)
		{
			excp.printStackTrace();
		}
		
		System.out.println(buffer.toString());
		Hashtable parameters = this.ParseLoginForm(buffer.toString());
		String actionUrl = this.ParseLoginFormAction(buffer.toString());
		
		parameters.put("email", this.email);
		parameters.put("pass", this.password);
		
		this.Login(actionUrl, parameters);

		int a = 0;
	}

	

}

[oregon]

L'ultimo tag CODE è sbagliato ... correggilo altrimenti il codice appare confuso

P.S. Evita di postare email con password !

[Alex'87]

Sei già stato su https://developers.facebook.com/docs/reference/login?

[macking]

Non ho trovato nulla che facesse al caso mio sulla documentazione di facebook...