[Java][MyAnimeList] Connection API workaround

TestConnect.java

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;

public class TestConnect {
	
	
	private static String username = "";
	private static String password = "";
	
	
	

	private static String cookies;
	private static String csrf_token;

	public static void main(String[] args) throws IOException, NoSuchAlgorithmException, InterruptedException {

		System.out.println(" ----------- Connecting to webserver ----------- ");
		SSLSocket socket = (SSLSocket) SSLContext.getDefault().getSocketFactory().createSocket("myanimelist.net", 443);
		System.out.println(" -- Connected ! -- ");
		BufferedReader inputStream = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		PrintWriter outputStream = new PrintWriter(new BufferedOutputStream(socket.getOutputStream()));

		System.out.println(" ----------- Fetching MALSESSIONID and csrf_token ----------- ");
		String malSessionId = getSessionId(inputStream, outputStream);
		System.out.println();
		if(malSessionId == null) {
			System.err.println(" -- Unable to fetch session id. Please verify your internet connection -- ");
			return;
		}
		System.out.println(" -- Data fetched ! -- ");
		System.out.println("MALSESSIONID : " + malSessionId);
		System.out.println("csrf_token   : " + csrf_token);
		System.out.println();
		
		System.out.println(" ----------- Trying to login ----------- ");
		malSessionId = tryLogin(malSessionId, inputStream, outputStream);
		if(malSessionId == null) {
			System.err.println(" -- Unable to login -- ");
			return;
		}
		System.out.println();
		System.out.println(" -- Logged in sucessfully ! -- ");
		System.out.println();
		System.out.println("Logged MALSESSIONID : " + malSessionId);

		System.out.println();
		socket.close();
		System.out.println(" ----------- Disconnected from webserver ----------- ");
		
	}
	
	
	public static String getSessionId(BufferedReader input, PrintWriter output) throws IOException {
		System.out.println("Sending GET request to https://myanimelist.net/");
		
		output.print("GET / HTTP/1.1\r\n");
		output.print("User-Agent: Slaynash's MAL API\r\n");
		output.print("Host: myanimelist.net\r\n");
		output.print("Connection: keep-alive\r\n");
		output.print("\r\n");
		output.flush();
		
		WebResponse wr = WaitForResponse(input);
		System.out.println("Return code: " + wr.returnCode);
		
		System.out.println("Fetching headers");
		List<String> setcookies = wr.headers.get("Set-Cookie");
		String msi = null;
		cookies = null;
		for(String setcookie : setcookies) {
			cookies = cookies == null ? setcookie.split(";", 2)[0] : (cookies +"; " + setcookie.split(";", 2)[0]);
			if(setcookie.startsWith("MALSESSIONID"))
				msi = setcookie.substring("MALSESSIONID=".length()).split(";", 2)[0];
		}
		System.out.println("Done");
		System.out.println("Cookie: " + cookies);
		
		csrf_token = wr.data.toString().split("csrf_token", 2)[1].split("'", 4)[2];
		System.out.println("csrf_token: " + csrf_token);
		
		return msi;
	}
	
	public static String tryLogin(String malSessionId, BufferedReader input, PrintWriter output) throws IOException {
		System.out.println("Sending POST request to https://myanimelist.net/login.php");
		
		String data = "user_name="+username;
		data += "&password="+password;
		data += "&sublogin=Login";
		data += "&cookie=1";
		data += "&submit=1";
		data += "&csrf_token=" + csrf_token;
		
		output.print("POST /login.php HTTP/1.1\r\n");
		output.print("User-Agent: Slaynash's MAL API\r\n");
		output.print("Host: myanimelist.net\r\n");
		output.print("Content-Type: application/x-www-form-urlencoded\r\n");
		output.print("Content-Length: " + data.getBytes().length + "\r\n");
		output.print("Connection: keep-alive\r\n");
		System.out.println("MSI: " + malSessionId);
		output.print("Cookie: MALSESSIONID=" + malSessionId + "\r\n");
		output.print("\r\n");
		output.print(data);
		output.flush();
		
		WebResponse wr = WaitForResponse(input);
		System.out.println("Return code: " + wr.returnCode);
		
		System.out.println("Fetching headers");
		List<String> setcookies = wr.headers.get("Set-Cookie");
		String msi = null;
		cookies = null;
		for(String setcookie : setcookies) {
			cookies = cookies == null ? setcookie.split(";", 2)[0] : (cookies +"; " + setcookie.split(";", 2)[0]);
			if(setcookie.startsWith("MALSESSIONID"))
				msi = setcookie.substring("MALSESSIONID=".length()).split(";", 2)[0];
		}
		System.out.println("Done");
		System.out.println("Cookie: " + cookies);
		
		return msi;
	}
	
	
	
	
	
	
	public static WebResponse WaitForResponse(BufferedReader input) throws IOException {
		WebResponse wr = new WebResponse();
		String[] responseCodeRaw = input.readLine().split(" ", 3);
		wr.version = responseCodeRaw[0]; System.out.println("Version: " + wr.version);
		wr.returnCode = Integer.parseInt(responseCodeRaw[1]); System.out.println("Return Code: " + wr.returnCode);
		wr.returnMessage = responseCodeRaw[2]; System.out.println("Return Message: " + wr.returnMessage);

		String ln;
		while(!(ln = input.readLine()).equals("")) {
			wr.addHeader(ln);
		}
		int length = 0;
		do {
			length = Integer.parseInt(input.readLine(), 16);
			char[] dataArray = new char[length];
			int read = 0;
			do {
				read += input.read(dataArray, read, length - read);
			} while(read != length);
			
			wr.data += new String(dataArray);
			input.readLine();
		} while(length > 0);
		
		return wr;
	}
	
	public static class WebResponse{
		public String version;
		public int returnCode;
		public String returnMessage;
		
		public Map<String, List<String>> headers = new HashMap<>();
		
		public String data = "";

		public void addHeader(String header) {
			String[] parts = header.split(":", 2);
			if(!headers.containsKey(parts[0].trim()))
				headers.put(parts[0].trim(), new ArrayList<>());
			headers.get(parts[0].trim()).add(parts[1].trim());
		}
	}
	
}