OldAuthentication.java

package net.minecraft.launcher.authentication;

import net.minecraft.launcher.Http;

import java.io.IOException;
import java.net.Proxy;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class OldAuthentication {
    private final Proxy proxy;
    private Response lastSuccessfulResponse;

    public OldAuthentication(Proxy proxy) {
        this.proxy = proxy;
    }

    public Response login(String username, String password) throws IOException {
        Map<String, Object> args = new HashMap<String, Object>();
        args.put("user", username);
        args.put("password", password);
        args.put("version", 14);
        String response = Http.performPost(new URL("https://login.minecraft.net"), args, proxy);
        String[] split = response.split(":");

        if (split.length == 5) {
            lastSuccessfulResponse = new Response(null, split[3], split[2], split[4]);
            return lastSuccessfulResponse;
        } else {
            return new Response(response, null, null, null);
        }
    }

    public Response getLastSuccessfulResponse() {
        return lastSuccessfulResponse;
    }

    public static class Response {
        private final String errorMessage;
        private final String sessionId;
        private final String name;
        private final String uuid;

        public Response(String errorMessage, String sessionId, String name, String uuid) {
            this.errorMessage = errorMessage;
            this.sessionId = sessionId;
            this.name = name;
            this.uuid = uuid;
        }

        public String getErrorMessage() {
            return errorMessage;
        }

        public String getSessionId() {
            return sessionId;
        }

        public String getName() {
            return name;
        }

        public String getUUID() {
            return uuid;
        }
    }
}