GroovyProxy.groovy

/*
Note that i am quite a groovy noob (this is pretty much my first project). So don't be harsh with me :) tell me what i can improve instead
*/

class Server {
    private ServerSocket server;
    String tarip;
    int tarport;

    def Server(int port, String tarip, int tarport) {
        server = new ServerSocket(port);
        this.tarip = tarip;
        this.tarport = tarport;
    }

    def listen() {
        Thread.start {
            while (true) {
                Client c = new Client(server.accept(), this);
            }
        }
    }
}

class Client {
    private final Socket socket;
    private Client oppositeSide;
    private BufferedReader reader;
    private BufferedWriter writer;
    private final Server server;
    private final isServerConnection;

    def Client(Socket socket, Server server) {

        this.server = server
        this.socket = socket

        oppositeSide = new Client(this, server);
        isServerConnection = true;
        initStreams();
    }

    def Client(Client opposite, Server server) {
        oppositeSide = opposite;
        this.server = server;
        socket = new Socket(server.tarip, server.tarport);
        isServerConnection = false;
        initStreams();
    }

    private def initStreams() {
        this.reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        this.writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));

        Thread.start(listenthread);
    }

    def listenthread = {
        String line = "";
        while (true) {
            line = reader.readLine();
            if (line == null) return;
            if (oppositeSide != null) {
                oppositeSide.writer.write(line + "\n");
                println (( isServerConnection ? "[SERVER] -> [CLIENT]" : "[CLIENT] -> [SERVER]") + " " + line);
                oppositeSide.writer.flush();
            }
        }
    }
}

def static main(String[] args_) {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    def read = { br.readLine(); }
    def List<String> args = [];
    //if (args_.size() < 3) {
        print("Listen port: ")
        args[0] = read();
        print("Target Host: ")
        args[1] = read();
        print("Target port: ")
        args[2] = read();
    /*} else {
        args[0] = args_[0];
        args[1] = args_[1];
        args[2] = args_[2];
    }*/
    new Server(Integer.parseInt(args[0]), args[1], Integer.parseInt(args[2])).listen();
}