302 lines
No EOL
12 KiB
JavaScript
302 lines
No EOL
12 KiB
JavaScript
const User = require('../../../models/User');
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const secret = require('../../../secret');
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const config = require('../../../config');
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const Category = require('../../../models/Category');
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const RateLimiter = require('./ratelimiter');
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const jwt = require('jsonwebtoken');
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const siolib = require('socket.io');
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const uuid = require('uuid');
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class GatewayServer {
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constructor(httpServer) {
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this._io = siolib(httpServer);
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this._gateway = this._io.of('/gateway');
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this.rateLimiter = new RateLimiter({
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points: 5,
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time: 1000,
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minPoints: 0
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});
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this.eventSetup();
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this._commandPrefix = '/';
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}
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}
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GatewayServer.prototype._sendSystemMessage = function(socket, message, category) {
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const messageObject = {
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author: {
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username: '__SYSTEM',
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_id: '5fc69864f15a7c5e504c9a1f'
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},
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category: {
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title: category.title,
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_id: category._id
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},
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content: message,
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_id: uuid.v4()
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};
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socket.emit('message', messageObject);
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};
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GatewayServer.prototype.notifyClientsOfUpdate = function(reason) {
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this._gateway.emit('refreshClient', { reason: reason || 'REFRESH' });
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};
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GatewayServer.prototype._processCommand = function(socket, message) {
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const content = message.content;
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const fullCommandString = content.slice(this._commandPrefix.length, content.length);
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const fullCommand = fullCommandString.split(' ');
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const command = fullCommand[0] || 'INVALID_COMMAND';
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const args = fullCommand.length - 1;
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switch (command) {
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case 'INVALID_COMMAND': {
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this._sendSystemMessage(socket, 'Invalid command.', message.category);
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break;
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}
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case 'admin/fr': {
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if (args === 1) {
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if (socket.user.permissionLevel >= config.roleMap.ADMIN) {
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this._gateway.emit('refreshClient', { reason: fullCommand[1] || 'REFRESH' });
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} else {
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this._sendSystemMessage(socket, 'how about no', message.category);
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}
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} else {
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this._sendSystemMessage(socket, 'Invalid number of arguments.', message.category);
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}
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break;
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}
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default: {
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this._sendSystemMessage(socket, 'That command does not exist.', message.category);
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break;
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}
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}
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};
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GatewayServer.prototype.authDisconnect = function(socket, callback) {
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console.log('[E] [gateway] [handshake] User disconnected due to failed authentication');
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socket.isConnected = false;
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socket.disconnect();
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socket.disconnect(true);
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callback(new Error('ERR_GATEWAY_AUTH_FAIL'));
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};
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GatewayServer.prototype.eventSetup = function() {
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this._gateway.use((socket, callback) => {
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console.log('[*] [gateway] [handshake] User authentication attempt');
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socket.isConnected = false;
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setTimeout(() => {
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if (socket.isConnected) return;
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console.log('[E] [gateway] [handshake] User still not connected after timeout, removing...');
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socket.disconnect();
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socket.disconnect(true);
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}, config.gatewayStillNotConnectedTimeoutMS);
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// TODO: Maybe passing the token in the query is not the best idea?
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const token = socket.handshake.query.token;
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if (!token) return this.authDisconnect(socket, callback);
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if (!(typeof token === 'string')) return this.authDisconnect(socket, callback);
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const allSockets = this._gateway.sockets;
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for (let [_, e] of allSockets) {
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if (e.user && e.user.token === token) {
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console.log(`[E] [gateway] [handshake] User ${e.user.username} tried to connect more than once, rejecting connection...`);
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return this.authDisconnect(socket, callback);
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}
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}
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jwt.verify(token, secret.jwtPrivateKey, {}, async (err, data) => {
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if (err) return this.authDisconnect(socket, callback);
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if (!data) return this.authDisconnect(socket, callback);
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if (!data.username) return this.authDisconnect(socket, callback);
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const user = await User.findByUsername(data.username);
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if (!user) return this.authDisconnect(socket, callback);
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let permissionLevel = config.roleMap[user.role];
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if (!permissionLevel) {
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permissionLevel = 0;
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}
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if (permissionLevel < config.roleMap.USER) return this.authDisconnect(socket, callback);
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socket.user = {
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username: data.username,
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_id: user._id.toString(),
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token, // NOTE(hippoz): Maybe not secure
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permissionLevel,
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color: user.color
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};
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console.log(`[*] [gateway] [handshake] User ${data.username} has successfully authenticated`);
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return callback();
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});
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});
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this._gateway.on('connection', (socket) => {
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console.log(`[*] [gateway] [handshake] User ${socket.user.username} connected, sending hello and waiting for yoo...`);
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socket.emit('hello', {
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gatewayStillNotConnectedTimeoutMS: config.gatewayStillNotConnectedTimeoutMS,
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resolvedUser: {
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username: socket.user.username,
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_id: socket.user._id
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}
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});
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socket.once('yoo', () => {
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console.log(`[*] [gateway] [handshake] Got yoo from ${socket.user.username}, connection is finally completed!`);
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socket.isConnected = true;
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socket.on('message', async ({ category, content, nickAuthor, destUser }) => {
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if (!category || !content || !socket.joinedCategories || !socket.isConnected || !socket.user || !(typeof content === 'string') || !(typeof category._id === 'string')) return;
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content = content.trim();
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if (!content || content === '' || content === ' ' || content.length >= 2000) return;
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if (!this.rateLimiter.consoom(socket.user.token)) { // TODO: maybe user ip instead of token?
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console.log(`[E] [gateway] Rate limiting ${socket.user.username}`);
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return;
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}
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// TODO: When/if category permissions are added, check if the user has permissions for that category
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const categoryTitle = socket.joinedCategories[category._id];
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if (!categoryTitle || !(typeof categoryTitle === 'string')) return;
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let messageObject = {
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author: {
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username: socket.user.username,
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_id: socket.user._id,
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color: socket.user.color
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},
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category: {
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title: categoryTitle,
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_id: category._id
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},
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content: content,
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_id: uuid.v4()
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};
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if (nickAuthor && nickAuthor.username && (typeof nickAuthor.username) === 'string' && nickAuthor.username.length <= 32 && nickAuthor.username.length >= 3) {
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if (socket.user.permissionLevel === config.roleMap.BOT) {
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messageObject = {
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nickAuthor: {
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username: nickAuthor.username
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},
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...messageObject
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}
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}
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}
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if (messageObject.content.startsWith(this._commandPrefix)) {
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this._processCommand(socket, messageObject);
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return;
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}
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if (destUser && destUser._id && (typeof destUser._id) === 'string') {
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const user = await this._findSocketInRoom(messageObject.category._id, destUser._id);
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if (!user) return;
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this._gateway.in(user.user.sid).emit('message', messageObject);
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return;
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}
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this._gateway.in(category._id).emit('message', messageObject);
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});
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socket.on('subscribe', async (categories) => {
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if ( !socket.isConnected || !socket.user || !categories || !Array.isArray(categories) || categories === []) return;
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for (const v of categories) {
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if (!v && !(typeof v === 'string')) continue;
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// TODO: When/if category permissions are added, check if the user has permissions for that category
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const category = await Category.findById(v);
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if (category && category.title && category._id) {
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if (!socket.joinedCategories) socket.joinedCategories = {};
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if (socket.joinedCategories[v]) continue;
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socket.joinedCategories[v] = category.title;
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await socket.join(v);
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console.log(`[*] [gateway] User ${socket.user.username} subscribed to room ${v} (${category.title}), sending updated user list to all members of that room...`);
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const upd = await this._generateClientListUpdateObject(v, category.title);
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this._gateway.in(v).emit('clientListUpdate', upd);
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}
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}
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});
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socket.on('disconnecting', async () => {
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console.log(`[*] [gateway] User ${socket.user.username} is disconnecting, broadcasting updated user list to all of the rooms they have been in...`);
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const rooms = socket.rooms;
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rooms.forEach(async (room) => {
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// Socket io automatically adds a user to a room with their own id
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if (room === socket.id) return;
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const categoryTitle = socket.joinedCategories[room] || 'UNKNOWN';
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await socket.leave(room);
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const upd = await this._generateClientListUpdateObject(room, categoryTitle);
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socket.in(room).emit('clientListUpdate', upd);
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});
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});
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});
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});
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};
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GatewayServer.prototype._getSocketsInRoom = async function(room) {
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// NOTE: I have no idea why i have to do this dumb thing, why can't socket io just let you simply get the sockets from a room? idk
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// There kinda was a way in the previous version, but they want to change the api for the worse each version, i'm guessing
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const clients = await this._gateway.in(room).allSockets();
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const updatedClientList = [];
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clients.forEach((sid) => {
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const client = this._gateway.sockets.get(sid); // lol they also used dumb ass maps for the socket list, can you fucking not?
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if (!client || !client.isConnected || !client.user) return;
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updatedClientList.push({
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user: {
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username: client.user.username,
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_id: client.user._id,
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color: client.user.color,
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sid: client.id
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}
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});
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});
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return updatedClientList;
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};
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GatewayServer.prototype._findSocketInRoom = async function(room, userid) {
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// NOTE: I have no idea why i have to do this dumb thing, why can't socket io just let you simply get the sockets from a room? idk
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// There kinda was a way in the previous version, but they want to change the api for the worse each version, i'm guessing
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const clients = await this._gateway.in(room).allSockets();
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const updatedClientList = [];
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clients.forEach((sid) => {
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const client = this._gateway.sockets.get(sid); // lol they also used dumb ass maps for the socket list, can you fucking not?
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if (!client || !client.isConnected || !client.user) return;
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if (userid !== client.user._id) return;
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updatedClientList.push({
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user: {
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username: client.user.username,
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_id: client.user._id,
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color: client.user.color,
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sid: client.id
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}
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});
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});
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return updatedClientList[0] || undefined;
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};
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GatewayServer.prototype._generateClientListUpdateObject = async function(room, categoryTitle='UNKNOWN') {
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const clientList = await this._getSocketsInRoom(room);
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return {
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category: {
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title: categoryTitle,
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_id: room
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},
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clientList
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};
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};
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module.exports = GatewayServer; |