Facebook – Login tramite una connessione HttpsURLConnection java

– effettuare una get connection su  “www.facebook.com”

    // Send a "GET" request, so that you can extract the form's data.
StringBuffer page = http.sendGet(url);

– prendere  i cookies della response e  popolare il form con la propria email e password

     // set values in the form
    String postParams = http.getFormParams(page.toString(), "XXXXX@XXX.XX", "XXXXXXXX");

–  effettua l’autenticazione tramite una connessione post

    // send a POST request for authentication
    http.sendPost(fb, postParams);

– collegarsi alla home con l’utente loggato

    // success then go to facebook.
StringBuffer result = http.sendGet(fbResult);
System.out.println(result);

Esempio Completo

package com.fbm.batch;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.net.ssl.HttpsURLConnection;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class ProvaLoginFB {

private List<String> cookies;
private HttpsURLConnection conn;
private static CookieManager manager;

private final String USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36";

public static void main(String[] args) throws Exception {

String url = "https://www.facebook.com/login.php";// primo login per prendere il form

String fb = "https://www.facebook.com/login.php?login_attempt=1";

String fbResult = "https://www.facebook.com/";
ProvaLoginFB http = new ProvaLoginFB();

// make sure cookies is turn on
manager = new CookieManager();
manager.setCookiePolicy(CookiePolicy.ACCEPT_ALL);
CookieHandler.setDefault(manager);

// Send a "GET" request, so that you can extract the form's data.
StringBuffer page = http.sendGet(url);

// set values in the form
String postParams = http.getFormParams(page.toString(), "XXXXX@XXX.XX", "XXXXXXXX");

// send a POST request for authentication
http.sendPost(fb, postParams);

// success then go to facebook.
StringBuffer result = http.sendGet(fbResult);
System.out.println(result);



}

private void sendPost(String url, String postParams) throws Exception {

System.out.println("prepare POST request");

URL obj = new URL(url);
conn = (HttpsURLConnection) obj.openConnection();

// Acts like a browser
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Host", "www.facebook.com");
conn.setRequestProperty("User-Agent", USER_AGENT);
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

for (String cookie : this.cookies) {
conn.addRequestProperty("Cookie", cookie);
}
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Referer", "https://www.facebook.com/");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", Integer.toString(postParams.length()));

conn.setDoOutput(true);
conn.setDoInput(true);

// Send post request
DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
wr.writeBytes(postParams);
wr.flush();
wr.close();

int responseCode = conn.getResponseCode();
System.out.println("nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + postParams);
System.out.println("Response Code : " + responseCode);

// Get the response cookies
setCookies(conn.getHeaderFields().get("Set-Cookie"));

BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();

}

private StringBuffer sendGet(String url) throws Exception {
System.out.println("prepare GET request");
URL obj = new URL(url);

conn = (HttpsURLConnection) obj.openConnection();

// default is GET
conn.setRequestMethod("GET");

conn.setUseCaches(false);

// act like a browser
conn.setRequestProperty("User-Agent", USER_AGENT);
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

if (cookies != null) {
for (String cookie : this.cookies) {
conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
}
}

int responseCode = conn.getResponseCode();
System.out.println("nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);

// Get the response cookies
setCookies(conn.getHeaderFields().get("Set-Cookie"));

BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();

return response;

}

public String getFormParams(String html, String username, String password) throws UnsupportedEncodingException {

System.out.println("Extracting form's data...");

Document doc = Jsoup.parse(html);

// Google form id
Element loginform = doc.getElementById("login_form");
Elements inputElements = loginform.getElementsByTag("input");
List<String> paramList = new ArrayList<String>();
for (Element inputElement : inputElements) {
String key = inputElement.attr("name");
String value = inputElement.attr("value");

if (key.equals("email"))
value = username;
else if (key.equals("pass"))
value = password;
paramList.add(key + "=" + URLEncoder.encode(value, "UTF-8"));
}

// build parameters list
StringBuilder result = new StringBuilder();
for (String param : paramList) {
if (result.length() == 0) {
result.append(param);
}
else {
result.append("&" + param);
}
}
return result.toString();
}

public List<String> getCookies() {
return cookies;
}

public void setCookies(List<String> cookies) {
if (cookies != null)
this.cookies = cookies;
}

}

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