DriveConsole.java

package com.company;

import javax.net.ssl.HttpsURLConnection;
import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    static String getServerTime() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat dateFormat = new SimpleDateFormat(
                "EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
        dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
        return dateFormat.format(calendar.getTime());
    }

    static final Pattern codePattern = Pattern.compile("GET /\\?code=(.*) HTTP/1\\.1");
    public static void main(String[] args) throws Exception {
        int port = 9004;
        ServerSocket serverSocket = new ServerSocket(port);
        //System.err.println("Serveur lanc? sur le port : " + port);

        while (true) {
            Socket clientSocket = serverSocket.accept();
            System.out.println(">>>> new client");


            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));

            String s, code = "";
            while ((s = in.readLine()) != null) {
                System.out.println(s);
                if(s.startsWith("GET")){
                    Matcher m =codePattern.matcher(s);
                    if(m.find()) {
                        code = m.group(1);
                        System.out.println(">>>> code = " + code);
                    }
                }
                if (s.isEmpty()) {
                    break;
                }
            }
            out.write("<p>OK</p>");

            // on ferme les flux.
            System.out.println(">>>> END");
            out.close();
            in.close();
            clientSocket.close();
            if(!code.isEmpty())
                sendReq(code);
        }
    }


    static void sendReq(String code) throws Exception{
        String response = "code=" + code
                + "&client_id=337164869739-qfql761p2d9mch06fu5jle06hna92ubg.apps.googleusercontent.com"
                + "&client_secret=FC6TdOB05RjyHzyUOJ8u-HsG"
                + "&redirect_uri=http://localhost:9004"
                + "&grant_type=authorization_code";

        URL url = new URL("https://www.googleapis.com/oauth2/v3/token");
        HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
        con.addRequestProperty("Content-type", "application/x-www-form-urlencoded");
        con.addRequestProperty("Host", "www.googleapis.com");
        con.setRequestMethod("POST");
        con.setFixedLengthStreamingMode(response.length());

        // Send post request
        con.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(response);
        wr.flush();
        wr.close();

//        Socket s = new Socket(InetAddress.getByName("accounts.google.com"), 80);
//        PrintWriter pw = new PrintWriter(s.getOutputStream());
//        pw.write("POST /oauth2/v3/token HTTP/1.1\r\n");
//        pw.write("Host: www.googleapis.com \r\n");
//        pw.write("Content-Type: application/x-www-form-urlencoded\r\n");
//        pw.println("Content-length: " + response.length());
//        pw.write("\r\n");
//        pw.write(response);
//        pw.flush();
        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);

        BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String t;
        System.out.println(">>>> Begin write post pesonse");
        while((t = br.readLine()) != null) System.out.println(t);
        br.close();
        con.disconnect();
    }

}