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function parseIRCMessage(line) {
line = line.replace(/\r?\n$/, '');
let tags = {};
let prefix = null;
let nick = null;
let command = null;
const params = [];
// tags
if (line[0] === '@') {
const end = line.indexOf(' ');
const rawTags = line.slice(1, end);
for (const tag of rawTags.split(';')) {
const [k, v = true] = tag.split('=');
tags[k] = v === true ? true : v;
}
line = line.slice(end + 1);
}
// prefix
if (line[0] === ':') {
const end = line.indexOf(' ');
prefix = line.slice(1, end);
const bang = prefix.indexOf('!');
if (bang !== -1) nick = prefix.slice(0, bang);
line = line.slice(end + 1);
}
// command and params
const parts = line.split(' ');
command = parts.shift();
for (let i = 0; i < parts.length; i++) {
if (parts[i][0] === ':') {
params.push(parts.slice(i).join(' ').slice(1));
break;
}
if (parts[i].length) params.push(parts[i]);
}
return { tags, prefix, nick, command, params };
}
function displayMessage(data) {
const messages = document.getElementById("window-messages");
const message = document.createElement("p");
message.classList.add("message");
if ("nick" in data && data.nick.length > 0) {
const nickElement = document.createElement("span");
nickElement.classList.add("nick");
nickElement.textContent = `${data.nick}: `;
if ("color" in data.tags) {
nickElement.style.color = data.tags["color"];
}
message.append(nickElement);
}
const messageContent = document.createElement("span");
messageContent.classList.add("content");
messageContent.textContent = data.params[1];
message.append(messageContent);
messages.append(message);
}
function displaySystemMessage(channelName, message, nick = "System") {
displayMessage({
"nick": nick,
"prefix": nick,
"command": "PRIVMSG",
"params": [channelName, message],
"tags": {}
});
}
class TwitchIRCClient {
constructor (host, nick, pass) {
this.joinedChannels = [];
this.socket = null;
this.host = host;
this.nick = nick;
this.pass = pass;
}
connect() {
this.socket = new WebSocket(this.host);
this.socket.addEventListener("open", () => {
this.socket.send(`NICK ${this.nick}`);
this.socket.send(`PASS ${this.pass}`);
this.socket.send(`CAP REQ :twitch.tv/tags twitch.tv/membership`);
});
this.socket.addEventListener("message", (e) => {
const lines = e.data.split("\r\n");
for (const line of lines) {
if (line.trim().length == 0) {
continue;
}
const msg = parseIRCMessage(line);
switch (msg.command) {
case "001": {
for (const c of this.joinedChannels) {
this.join(c);
}
displaySystemMessage("*", "Connected!");
break;
}
case "PRIVMSG": {
displayMessage(msg);
}
default: break;
}
}
});
this.socket.addEventListener("error", (e) => {
console.error(e);
});
this.socket.addEventListener("close", (e) => {
for (const c of this.joinedChannels) {
displaySystemMessage(c, `Disconnected! Reason: ${e.reason}`);
displaySystemMessage(c, "Reconnecting in 10 seconds...");
}
setTimeout(() => this.connect(), 10000);
});
}
say(channelName, message) {
this.socket.send(`PRIVMSG #${channelName} :${message}`);
}
join(channelName) {
if (this.socket != null && this.socket.readyState == this.socket.OPEN) {
this.socket.send(`JOIN #${channelName}`);
}
if (!this.joinedChannels.includes(channelName)) {
this.joinedChannels.push(channelName);
}
}
}
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