client.communication.ClientRequest.java Source code

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Here is the source code for client.communication.ClientRequest.java

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/*
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 */

package client.communication;

import client.game.Player;
import com.google.gson.Gson;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.codec.binary.Hex;

/**
 *  Realiza o envio e tratamento das mensagens entre cliente/servidor
 * 
 * @author bruno.weig
 */
public class ClientRequest {
    public enum Command {
        UP("up"), RIGHT("right"), DOWN("down"), LEFT("left"), ACTION("action");

        String value;

        private Command(String value) {
            this.value = value;
        }

        @Override
        public String toString() {
            return value;
        }
    }

    public enum Request {
        LOGIN("login"), PRESS("press"), LOGOUT("logout");

        String value;

        private Request(String value) {
            this.value = value;
        }

        @Override
        public String toString() {
            return value;
        }
    }

    public enum Reply {
        OK("ok"), COLLIDING("colliding"), FAIL("fail");

        String value;

        private Reply(String value) {
            this.value = value;
        }

        @Override
        public String toString() {
            return value;
        }
    }

    Player player = null;

    static ClientRequest clientRequest = null;

    SocketClient socket = null;
    String request = "";
    String reply = "";

    private ClientRequest() {

    }

    static public ClientRequest getInstance() {
        if (clientRequest == null)
            clientRequest = new ClientRequest();

        return clientRequest;
    }

    public Player login(String username, String password) {
        socket = new SocketClient();

        MessageDigest md = null;

        String passwordHash = "";

        // Gera o hash md5 da senha digitada pelo usurio
        try {
            md = MessageDigest.getInstance("MD5");
            md.update(password.getBytes());

            passwordHash = Hex.encodeHexString(md.digest());
        } catch (NoSuchAlgorithmException e) {
            System.err.println(this.getClass().getName() + ": " + e.getMessage());
        }

        request = makeRequest(Request.LOGIN, username + " " + passwordHash);

        //        System.out.println("Serialized Object Size: " + q.length());
        //        System.out.println("Deserialize: " + q);

        reply = socket.sendMessage(request);

        if (reply.equals(Reply.FAIL.toString())) {
            return null;
        } else {
            // Deserializa objeto
            Gson gson = new Gson();
            player = gson.fromJson(reply, Player.class);
        }

        socket = null;

        return player;
    }

    /**
     * Trata as entradas do usurio
     * 
     * @param command
     * @return 
     */
    public String press(Command command) {
        socket = new SocketClient();

        String direction = "";

        switch (command) {
        case UP:
            direction = "up";
            break;
        case RIGHT:
            direction = "right";
            break;
        case DOWN:
            direction = "down";
            break;
        case LEFT:
            direction = "left";
            break;
        case ACTION:
            direction = "action";
            break;
        }

        request = makeRequest(Request.PRESS, direction);

        reply = socket.sendMessage(request);

        socket = null;

        return reply;
    }

    private String makeRequest(Request command) {
        return makeRequest(command, null);
    }

    /**
     * Monta uma requisio com id e cdigo de verificao do usurio no formato: 
     * <id>:<verificationCode>:<command>:<parameters*>
     * 
     * @param command
     * @param parameters
     * @return 
     */
    private String makeRequest(Request command, String parameters) {
        String _message = "";

        // Requisio deve sempre ter 4 parmetros (no vazios) separados por :
        if (parameters == null || parameters.isEmpty()) {
            parameters = "0";
        }

        // Caso usurio esteja logado
        if (player != null) {
            _message = player.getId() + ":" + player.getVerificationCode() + ":" + command.toString() + ":"
                    + parameters;
        } else {
            // Login
            _message = "0:0:" + command.toString() + ":" + parameters;
        }

        return _message;
    }

    /**
     * Realia logout do jogo
     * 
     * @return 
     */
    public boolean logout() {
        socket = new SocketClient();

        reply = socket.sendMessage(makeRequest(Request.LOGOUT));

        // Desaloca player caso logout ocorrer com sucesso
        if (!reply.equals(Reply.OK.toString())) {
            System.out.println("Problem to logout!");
        }

        player = null;
        socket = null;

        return true;
    }
}