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"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Socket = exports.RESERVED_EVENTS = void 0;
const events_1 = require("events");
const socket_io_parser_1 = require("socket.io-parser");
const url = require("url");
const debug_1 = __importDefault(require("debug"));
const base64id_1 = __importDefault(require("base64id"));
const debug = debug_1.default("socket.io:socket");
exports.RESERVED_EVENTS = new Set([
"connect",
"connect_error",
"disconnect",
"disconnecting",
// EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
"newListener",
"removeListener",
]);
class Socket extends events_1.EventEmitter {
/**
* Interface to a `Client` for a given `Namespace`.
*
* @param {Namespace} nsp
* @param {Client} client
* @param {Object} auth
* @package
*/
constructor(nsp, client, auth) {
super();
this.nsp = nsp;
this.client = client;
this.acks = new Map();
this.fns = [];
this.flags = {};
this._rooms = new Set();
this.server = nsp.server;
this.adapter = this.nsp.adapter;
if (client.conn.protocol === 3) {
// @ts-ignore
this.id = nsp.name !== "/" ? nsp.name + "#" + client.id : client.id;
}
else {
this.id = base64id_1.default.generateId(); // don't reuse the Engine.IO id because it's sensitive information
}
this.connected = true;
this.disconnected = false;
this.handshake = this.buildHandshake(auth);
}
/**
* Builds the `handshake` BC object
*
* @private
*/
buildHandshake(auth) {
return {
headers: this.request.headers,
time: new Date() + "",
address: this.conn.remoteAddress,
xdomain: !!this.request.headers.origin,
// @ts-ignore
secure: !!this.request.connection.encrypted,
issued: +new Date(),
url: this.request.url,
query: url.parse(this.request.url, true).query,
auth,
};
}
/**
* Emits to this client.
*
* @return Always returns `true`.
* @public
*/
emit(ev, ...args) {
if (exports.RESERVED_EVENTS.has(ev)) {
throw new Error(`"${ev}" is a reserved event name`);
}
args.unshift(ev);
const packet = {
type: socket_io_parser_1.PacketType.EVENT,
data: args,
};
// access last argument to see if it's an ACK callback
if (typeof args[args.length - 1] === "function") {
if (this._rooms.size || this.flags.broadcast) {
throw new Error("Callbacks are not supported when broadcasting");
}
debug("emitting packet with ack id %d", this.nsp._ids);
this.acks.set(this.nsp._ids, args.pop());
packet.id = this.nsp._ids++;
}
const rooms = new Set(this._rooms);
const flags = Object.assign({}, this.flags);
// reset flags
this._rooms.clear();
this.flags = {};
if (rooms.size || flags.broadcast) {
this.adapter.broadcast(packet, {
except: new Set([this.id]),
rooms: rooms,
flags: flags,
});
}
else {
// dispatch packet
this.packet(packet, flags);
}
return true;
}
/**
* Targets a room when broadcasting.
*
* @param name
* @return self
* @public
*/
to(name) {
this._rooms.add(name);
return this;
}
/**
* Targets a room when broadcasting.
*
* @param name
* @return self
* @public
*/
in(name) {
this._rooms.add(name);
return this;
}
/**
* Sends a `message` event.
*
* @return self
* @public
*/
send(...args) {
this.emit("message", ...args);
return this;
}
/**
* Sends a `message` event.
*
* @return self
* @public
*/
write(...args) {
this.emit("message", ...args);
return this;
}
/**
* Writes a packet.
*
* @param {Object} packet - packet object
* @param {Object} opts - options
* @private
*/
packet(packet, opts = {}) {
packet.nsp = this.nsp.name;
opts.compress = false !== opts.compress;
this.client._packet(packet, opts);
}
/**
* Joins a room.
*
* @param {String|Array} rooms - room or array of rooms
* @return a Promise or nothing, depending on the adapter
* @public
*/
join(rooms) {
debug("join room %s", rooms);
return this.adapter.addAll(this.id, new Set(Array.isArray(rooms) ? rooms : [rooms]));
}
/**
* Leaves a room.
*
* @param {String} room
* @return a Promise or nothing, depending on the adapter
* @public
*/
leave(room) {
debug("leave room %s", room);
return this.adapter.del(this.id, room);
}
/**
* Leave all rooms.
*
* @private
*/
leaveAll() {
this.adapter.delAll(this.id);
}
/**
* Called by `Namespace` upon successful
* middleware execution (ie: authorization).
* Socket is added to namespace array before
* call to join, so adapters can access it.
*
* @private
*/
_onconnect() {
debug("socket connected - writing packet");
this.join(this.id);
if (this.conn.protocol === 3) {
this.packet({ type: socket_io_parser_1.PacketType.CONNECT });
}
else {
this.packet({ type: socket_io_parser_1.PacketType.CONNECT, data: { sid: this.id } });
}
}
/**
* Called with each packet. Called by `Client`.
*
* @param {Object} packet
* @private
*/
_onpacket(packet) {
debug("got packet %j", packet);
switch (packet.type) {
case socket_io_parser_1.PacketType.EVENT:
this.onevent(packet);
break;
case socket_io_parser_1.PacketType.BINARY_EVENT:
this.onevent(packet);
break;
case socket_io_parser_1.PacketType.ACK:
this.onack(packet);
break;
case socket_io_parser_1.PacketType.BINARY_ACK:
this.onack(packet);
break;
case socket_io_parser_1.PacketType.DISCONNECT:
this.ondisconnect();
break;
case socket_io_parser_1.PacketType.CONNECT_ERROR:
this._onerror(new Error(packet.data));
}
}
/**
* Called upon event packet.
*
* @param {Object} packet - packet object
* @private
*/
onevent(packet) {
const args = packet.data || [];
debug("emitting event %j", args);
if (null != packet.id) {
debug("attaching ack callback to event");
args.push(this.ack(packet.id));
}
if (this._anyListeners && this._anyListeners.length) {
const listeners = this._anyListeners.slice();
for (const listener of listeners) {
listener.apply(this, args);
}
}
this.dispatch(args);
}
/**
* Produces an ack callback to emit with an event.
*
* @param {Number} id - packet id
* @private
*/
ack(id) {
const self = this;
let sent = false;
return function () {
// prevent double callbacks
if (sent)
return;
const args = Array.prototype.slice.call(arguments);
debug("sending ack %j", args);
self.packet({
id: id,
type: socket_io_parser_1.PacketType.ACK,
data: args,
});
sent = true;
};
}
/**
* Called upon ack packet.
*
* @private
*/
onack(packet) {
const ack = this.acks.get(packet.id);
if ("function" == typeof ack) {
debug("calling ack %s with %j", packet.id, packet.data);
ack.apply(this, packet.data);
this.acks.delete(packet.id);
}
else {
debug("bad ack %s", packet.id);
}
}
/**
* Called upon client disconnect packet.
*
* @private
*/
ondisconnect() {
debug("got disconnect packet");
this._onclose("client namespace disconnect");
}
/**
* Handles a client error.
*
* @private
*/
_onerror(err) {
if (this.listeners("error").length) {
super.emit("error", err);
}
else {
console.error("Missing error handler on `socket`.");
console.error(err.stack);
}
}
/**
* Called upon closing. Called by `Client`.
*
* @param {String} reason
* @throw {Error} optional error object
*
* @private
*/
_onclose(reason) {
if (!this.connected)
return this;
debug("closing socket - reason %s", reason);
super.emit("disconnecting", reason);
this.leaveAll();
this.nsp._remove(this);
this.client._remove(this);
this.connected = false;
this.disconnected = true;
super.emit("disconnect", reason);
return;
}
/**
* Produces an `error` packet.
*
* @param {Object} err - error object
*
* @private
*/
_error(err) {
this.packet({ type: socket_io_parser_1.PacketType.CONNECT_ERROR, data: err });
}
/**
* Disconnects this client.
*
* @param {Boolean} close - if `true`, closes the underlying connection
* @return {Socket} self
*
* @public
*/
disconnect(close = false) {
if (!this.connected)
return this;
if (close) {
this.client._disconnect();
}
else {
this.packet({ type: socket_io_parser_1.PacketType.DISCONNECT });
this._onclose("server namespace disconnect");
}
return this;
}
/**
* Sets the compress flag.
*
* @param {Boolean} compress - if `true`, compresses the sending data
* @return {Socket} self
* @public
*/
compress(compress) {
this.flags.compress = compress;
return this;
}
/**
* Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
* receive messages (because of network slowness or other issues, or because they’re connected through long polling
* and is in the middle of a request-response cycle).
*
* @return {Socket} self
* @public
*/
get volatile() {
this.flags.volatile = true;
return this;
}
/**
* Sets a modifier for a subsequent event emission that the event data will only be broadcast to every sockets but the
* sender.
*
* @return {Socket} self
* @public
*/
get broadcast() {
this.flags.broadcast = true;
return this;
}
/**
* Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
*
* @return {Socket} self
* @public
*/
get local() {
this.flags.local = true;
return this;
}
/**
* Dispatch incoming event to socket listeners.
*
* @param {Array} event - event that will get emitted
* @private
*/
dispatch(event) {
debug("dispatching an event %j", event);
this.run(event, (err) => {
process.nextTick(() => {
if (err) {
return this._onerror(err);
}
super.emit.apply(this, event);
});
});
}
/**
* Sets up socket middleware.
*
* @param {Function} fn - middleware function (event, next)
* @return {Socket} self
* @public
*/
use(fn) {
this.fns.push(fn);
return this;
}
/**
* Executes the middleware for an incoming event.
*
* @param {Array} event - event that will get emitted
* @param {Function} fn - last fn call in the middleware
* @private
*/
run(event, fn) {
const fns = this.fns.slice(0);
if (!fns.length)
return fn(null);
function run(i) {
fns[i](event, function (err) {
// upon error, short-circuit
if (err)
return fn(err);
// if no middleware left, summon callback
if (!fns[i + 1])
return fn(null);
// go on to next
run(i + 1);
});
}
run(0);
}
/**
* A reference to the request that originated the underlying Engine.IO Socket.
*
* @public
*/
get request() {
return this.client.request;
}
/**
* A reference to the underlying Client transport connection (Engine.IO Socket object).
*
* @public
*/
get conn() {
return this.client.conn;
}
/**
* @public
*/
get rooms() {
return this.adapter.socketRooms(this.id) || new Set();
}
/**
* Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
* callback.
*
* @param listener
* @public
*/
onAny(listener) {
this._anyListeners = this._anyListeners || [];
this._anyListeners.push(listener);
return this;
}
/**
* Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
* callback. The listener is added to the beginning of the listeners array.
*
* @param listener
* @public
*/
prependAny(listener) {
this._anyListeners = this._anyListeners || [];
this._anyListeners.unshift(listener);
return this;
}
/**
* Removes the listener that will be fired when any event is emitted.
*
* @param listener
* @public
*/
offAny(listener) {
if (!this._anyListeners) {
return this;
}
if (listener) {
const listeners = this._anyListeners;
for (let i = 0; i < listeners.length; i++) {
if (listener === listeners[i]) {
listeners.splice(i, 1);
return this;
}
}
}
else {
this._anyListeners = [];
}
return this;
}
/**
* Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
* e.g. to remove listeners.
*
* @public
*/
listenersAny() {
return this._anyListeners || [];
}
}
exports.Socket = Socket;
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