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|
const ServerPort = 8888;
const AllowMods = false;
const _version = "0.1";
const Net = require('net');
const clients = {};
class MessageBuffer {
constructor(delimiter) {
this.delimiter = delimiter
this.buffer = ""
}
isFinished() {
if (
this.buffer.length === 0 ||
this.buffer.indexOf(this.delimiter) === -1
) {
return true
}
return false
}
push(data) {
this.buffer += data
}
getMessage() {
const delimiterIndex = this.buffer.indexOf(this.delimiter)
if (delimiterIndex !== -1) {
const message = this.buffer.slice(0, delimiterIndex)
this.buffer = this.buffer.replace(message + this.delimiter, "")
return message
}
return null
}
handleData() {
/**
* Try to accumulate the buffer with messages
*
* If the server isnt sending delimiters for some reason
* then nothing will ever come back for these requests
*/
const message = this.getMessage()
return message
}
}
class KartikError extends Error {
constructor(message, type) {
super(message);
this.name = "KartikError";
this.ktype = type;
}
}
const server = new Net.Server();
server.on('connection', (socket) => {
socket.connectionId = (Math.random().toString(36).split(".")[1] + Math.random().toString(36).split(".")[1]).substr(0, 8);
socket.linkedTo = null;
clients[socket.connectionId] = socket;
console.log("New connection " + socket.connectionId)
socket.write(JSON.stringify(
{
_type: "init",
name: "Kartik Server",
version: _version,
id: socket.connectionId,
modded: null
}
) + "\n")
setTimeout(() => {
try {
if (socket.linkedTo === null) {
throw new KartikError("Not linked within 3 minutes", "net.minteckprojects.kartik.KartikServer.ClientConnectTimeoutException");
}
} catch (e) {
console.error(e);
if (e.name !== "KartikError") {
e.ktype = "nodejs.lang." + e.name.replaceAll("Error", "Exception");
}
socket.write(JSON.stringify({
_type: "error",
message: e.message,
type: e.ktype
}) + "\n")
socket.end();
}
}, 180000)
/*let received = "";
socket.on("data", (data) => {
data = data.toString();
received = received + data.substr(1);
console.log("{{" + data + "}}");
if (data.startsWith(":")) {
return;
}
try {
raw = chunk.toString().replaceAll("}{", "}|{");
datas = raw.split("|").filter(i => i.trim() !== "");
datas.forEach((data) => {
try {
info = JSON.parse(data);
} catch(e) {
console.dir(data);
throw e;
}
if (data.length > 1200) {
console.dir(data);
throw new KartikError("Received data is too long", "net.minteckprojects.kartik.KartikServer.DataLengthException");
}
if (typeof info['_type'] != "string") {
throw new KartikError("Invalid JSON data", "net.minteckprojects.kartik.KartikServer.JsonDataException");
}
if (!socket.initialized) {
switch (info['_type']) {
case "init":
if (info['name'] !== "Kartik Core") {
throw new KartikError("Invalid client", "net.minteckprojects.kartik.KartikServer.AuthenticationException");
}
if (!info.modded) {
console.log("Connection initialized. Client running " + info.name + " version " + info.version + ", official client");
} else {
console.log("Connection initialized. Client running " + info.name + " version " + info.version + ", MODDED client");
if (!AllowMods) {
console.log("Modded clients are not accepted");
socket.end();
}
}
socket.initialized = true;
break;
default:
throw new KartikError("Trying to receive data but client not initialized", "net.minteckprojects.kartik.KartikServer.AuthenticationException");
}
} else {
switch (info['_type']) {
case "init":
throw new KartikError("Trying to initialize client but client is already initialized", "net.minteckprojects.kartik.KartikServer.AuthenticationException");
case "link":
if (typeof info['client'] !== "string" || isNaN(parseInt(info['client'], 16))) {
throw new KartikError("Invalid client link ID", "net.minteckprojects.kartik.KartikServer.GuestIdentifierException");
}
if (typeof clients[info['client']] === "undefined") {
throw new KartikError("Guest client not found", "net.minteckprojects.kartik.KartikServer.GuestConnectException");
}
if (clients[info['client']].linkedTo === null) {
socket.linkedTo = clients[info['client']];
clients[info['client']].linkedTo = socket;
socket.linkedTo.role = "host";
socket.linkedTo.write(JSON.stringify(
{
_type: "linked",
role: "host",
ids: {
host: socket.linkedTo.connectionId,
guest: socket.connectionId
}
}
))
socket.role = "guest";
socket.write(JSON.stringify(
{
_type: "linked",
role: "guest",
ids: {
host: socket.linkedTo.connectionId,
guest: socket.connectionId
}
}
))
console.log("Link created: (H) " + socket.connectionId + " <-> " + socket.linkedTo.connectionId + " (G)")
} else {
throw new KartikError("Client already linked to another client", "net.minteckprojects.kartik.KartikServer.GuestAllocationException")
}
break;
default:
if (socket.linkedTo === null) {
throw new KartikError("Client not linked to another client", "net.minteckprojects.kartik.KartikServer.DataRoutingException");
} else {
socket.linkedTo.write(JSON.stringify(info));
}
}
}
})
} catch (e) {
console.error(e);
if (e.name !== "KartikError") {
e.ktype = "nodejs.lang." + e.name.replaceAll("Error", "Exception");
}
socket.write(JSON.stringify({
_type: "error",
message: e.message,
type: e.ktype
}))
socket.end();
}
})*/
let received = new MessageBuffer("\n")
socket.on("data", data => {
received.push(data)
while (!received.isFinished()) {
const chunk = received.handleData()
try {
raw = chunk.toString().replaceAll("}{", "}|{");
datas = raw.split("|").filter(i => i.trim() !== "");
datas.forEach((data) => {
try {
info = JSON.parse(data);
} catch(e) {
console.dir(data);
throw e;
}
if (data.length > 1200) {
console.dir(data);
throw new KartikError("Received data is too long", "net.minteckprojects.kartik.KartikServer.DataLengthException");
}
if (typeof info['_type'] != "string") {
throw new KartikError("Invalid JSON data", "net.minteckprojects.kartik.KartikServer.JsonDataException");
}
if (!socket.initialized) {
switch (info['_type']) {
case "init":
if (info['name'] !== "Kartik Core") {
throw new KartikError("Invalid client", "net.minteckprojects.kartik.KartikServer.AuthenticationException");
}
if (!info.modded) {
console.log("Connection initialized. Client running " + info.name + " version " + info.version + ", official client");
} else {
console.log("Connection initialized. Client running " + info.name + " version " + info.version + ", MODDED client");
if (!AllowMods) {
console.log("Modded clients are not accepted");
socket.end();
}
}
socket.initialized = true;
break;
default:
throw new KartikError("Trying to receive data but client not initialized", "net.minteckprojects.kartik.KartikServer.AuthenticationException");
}
} else {
switch (info['_type']) {
case "init":
throw new KartikError("Trying to initialize client but client is already initialized", "net.minteckprojects.kartik.KartikServer.AuthenticationException");
case "ping":
socket.write(JSON.stringify(
{
_type: "pong",
}
) + "\n")
break;
case "link":
if (typeof info['client'] !== "string" || isNaN(parseInt(info['client'], 16))) {
throw new KartikError("Invalid client link ID", "net.minteckprojects.kartik.KartikServer.GuestIdentifierException");
}
if (typeof clients[info['client']] === "undefined") {
throw new KartikError("Guest client not found", "net.minteckprojects.kartik.KartikServer.GuestConnectException");
}
if (clients[info['client']].linkedTo === null) {
socket.linkedTo = clients[info['client']];
clients[info['client']].linkedTo = socket;
socket.linkedTo.role = "host";
socket.linkedTo.write(JSON.stringify(
{
_type: "linked",
role: "host",
ids: {
host: socket.linkedTo.connectionId,
guest: socket.connectionId
}
}
) + "\n")
socket.role = "guest";
socket.write(JSON.stringify(
{
_type: "linked",
role: "guest",
ids: {
host: socket.linkedTo.connectionId,
guest: socket.connectionId
}
}
) + "\n")
console.log("Link created: (H) " + socket.connectionId + " <-> " + socket.linkedTo.connectionId + " (G)")
} else {
throw new KartikError("Client already linked to another client", "net.minteckprojects.kartik.KartikServer.GuestAllocationException")
}
break;
default:
if (socket.linkedTo === null) {
throw new KartikError("Client not linked to another client", "net.minteckprojects.kartik.KartikServer.DataRoutingException");
} else {
socket.linkedTo.write(JSON.stringify(info) + "\n");
}
}
}
})
} catch (e) {
console.error(e);
if (e.name !== "KartikError") {
e.ktype = "nodejs.lang." + e.name.replaceAll("Error", "Exception");
}
socket.write(JSON.stringify({
_type: "error",
message: e.message,
type: e.ktype
}) + "\n")
socket.end();
}
}
})
socket.on('error', (err) => {
console.error(err);
try {
if (err.code === "ECONNRESET") {
try {
socket.linkedTo.end();
} catch (e) {
console.log("Cannot end other client's session");
}
}
} catch (e) {
console.log("Cannot check if connection reset")
}
})
socket.on('end', (chunk) => {
console.log("Connection from " + socket.connectionId + " closed");
if (socket.linkedTo !== null) {
if (socket.role === "guest") {
console.log("Link broken: (H) " + socket.linkedTo.connectionId + " <-> " + socket.connectionId + " (G)");
} else {
console.log("Link broken: (H) " + socket.connectionId + " <-> " + socket.linkedTo.connectionId + " (G)");
}
try {
socket.linkedTo.end();
} catch (e) {
console.log("Cannot end other client's session");
}
}
delete clients[socket.connectionId];
})
})
server.listen(ServerPort, () => {
console.log("Kartik Server " + _version + " listening for connections on 0.0.0.0:" + ServerPort)
})
|
