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discord.api.js
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discord.api.js
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import WebSocket from "ws";
import Crypto from "crypto";
import { EventEmitter } from "events";
import { LazyMap } from "./util.js";
class Waitable
{
constructor(emitter, event)
{
this._emitter = emitter;
this._event = event;
this._condition = null;
}
that(condition)
{
this._condition = condition;
return this;
}
wait(timeMs)
{
return new Promise((resolve, reject) =>
{
let timeout = null;
let handler = null;
handler = d =>
{
if (this._condition && !this._condition(d)) return;
this._emitter.off(this._event, handler);
clearTimeout(timeout);
resolve(d);
};
this._emitter.on(this._event, handler);
if (!timeMs || timeMs <= 0) return;
timeout = setTimeout(() =>
{
this._emitter.off(this._event, handler);
reject(`Promise timed out after ${timeMs}ms`);
}, timeMs);
});
}
}
class OutgoingCloseCode
{
// static NORMAL = 1000;
static RESUME = 4200;
}
class Opcode
{
static DISPATCH = 0;
static HEARTBEAT = 1;
static IDENTIFY = 2;
static RESUME = 6;
static RECONNECT = 7;
static REQUEST_GUILD_MEMBERS = 8;
static INVALID_SESSION = 9;
static HELLO = 10;
static HEARTBEAT_ACK = 11;
}
export class Intent
{
static GUILDS = 1 << 0;
static GUILD_MEMBERS = 1 << 1;
}
export class GatewayClient extends EventEmitter // TODO: Timeouts on waits
{
static INITIAL_GATEWAY_URL = "wss://gateway.discord.gg";
static GATEWAY_PARAMETERS = "v=10&encoding=json";
constructor(token, intents)
{
super();
this._token = token;
this._intents = intents;
this._ws = null;
this._heartbeat = null;
this._sequence = null;
this._sessionId = null;
this._resumeGatewayUrl = null;
}
next(event)
{
return new Waitable(this, event);
}
_send(data)
{
this._ws.send(JSON.stringify(data));
}
_sendHeartbeat()
{
this._send({ op: Opcode.HEARTBEAT, d: this._sequence });
}
getGuildMembers(guildId, userIds)
{
const nonce = Crypto.randomBytes(24).toString("base64");
this._send({ op: Opcode.REQUEST_GUILD_MEMBERS, d: { guild_id: guildId, user_ids: userIds, limit: 0, nonce } });
return this.next("GUILD_MEMBERS_CHUNK").that(e => e.nonce == nonce).wait();
}
async _connect(force)
{
if (this._ws)
{
this._ws.onclose = null;
this._ws.onerror = null;
this._ws.onmessage = null;
this._ws.close(OutgoingCloseCode.RESUME);
clearInterval(this._heartbeat);
}
// always try to resume UNLESS we don't have the resume url OR we forced a re-identify
const resume = !force && this._sequence && this._sessionId && this._resumeGatewayUrl;
if (resume) console.log("Attempting resume...");
else console.log("Attempting identify...");
const url = resume ? this._resumeGatewayUrl : GatewayClient.INITIAL_GATEWAY_URL;
this._ws = new WebSocket(`${url}?${GatewayClient.GATEWAY_PARAMETERS}`);
this._ws.onclose = e => this._close(e.code, e.reason);
this._ws.onerror = e => this._error(e);
this._ws.onmessage = e => this._handle(JSON.parse(e.data));
const hello = await this.next("message").that(p => p.op == Opcode.HELLO).wait(); // TODO: Potentially don't wait for hello
this._heartbeat = setInterval(this._sendHeartbeat.bind(this), hello.d.heartbeat_interval);
if (resume)
{
this._send({ op: Opcode.RESUME, d: { token: this._token, session_id: this._sessionId, seq: this._sequence } });
}
else
{
this._send({ op: Opcode.IDENTIFY, d: { token: this._token, intents: this._intents, properties: { os: "linux", browser: "maneplace", device: "maneplace" } } });
const ready = await this.next("READY").wait();
this._sessionId = ready.session_id;
this._resumeGatewayUrl = ready.resume_gateway_url;
return ready.user;
}
}
login()
{
return this._connect();
}
_handle(payload)
{
this.emit("message", payload);
if (payload.s) this._sequence = payload.s;
if (payload.op == Opcode.DISPATCH) this.emit(payload.t, payload.d);
else if (payload.op == Opcode.HEARTBEAT) this._sendHeartbeat();
else if (payload.op == Opcode.RECONNECT) this._connect();
else if (payload.op == Opcode.INVALID_SESSION) this._connect(true);
}
_close(code, reason)
{
this.emit("close", code, reason);
this._connect(); // TODO: Max retries
}
_error(event)
{
this.emit("error", event);
this._connect();
}
}
export class Client // TODO: Also implement a general user cache for users that are not in the server (left/banned/etc)
{
constructor(token, intents)
{
this._gatewayClient = new GatewayClient(token, intents);
this._guildCache = new LazyMap(); // TODO: Clear on gateway re-identify
this._gatewayClient.on("GUILD_MEMBER_ADD", e =>
{
this._guildCache.get(e.guild_id, () => new LazyMap()).set(e.user.id, e);
});
this._gatewayClient.on("GUILD_MEMBER_REMOVE", e =>
{
this._guildCache.get(e.guild_id, () => new LazyMap()).set(e.user.id, null);
});
this._gatewayClient.on("GUILD_MEMBER_UPDATE", e =>
{
const memberCache = this._guildCache.get(e.guild_id, () => new LazyMap());
const member = memberCache.get(e.user.id);
if (member) memberCache.set(e.user.id, Object.assign(member, e));
});
}
login()
{
return this._gatewayClient.login();
}
async getGuildMember(guildId, userId)
{
if (!userId) return null; // TODO: validate guildId/userId snowflakes
const memberCache = this._guildCache.get(guildId, () => new LazyMap());
let member = memberCache.get(userId);
if (member === undefined) // Use null to check if we already fetched before
{
const fetched = await this._gatewayClient.getGuildMembers(guildId, userId);
member = fetched.members[0] || null;
memberCache.set(userId, member);
}
return member;
}
}