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Filename : client.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Client = void 0;
const socket_io_parser_1 = require("socket.io-parser");
const debugModule = require("debug");
const url = require("url");
const debug = debugModule("socket.io:client");
class Client {
    /**
     * Client constructor.
     *
     * @param server instance
     * @param conn
     * @package
     */
    constructor(server, conn) {
        this.sockets = new Map();
        this.nsps = new Map();
        this.server = server;
        this.conn = conn;
        this.encoder = server.encoder;
        this.decoder = new server._parser.Decoder();
        this.id = conn.id;
        this.setup();
    }
    /**
     * @return the reference to the request that originated the Engine.IO connection
     *
     * @public
     */
    get request() {
        return this.conn.request;
    }
    /**
     * Sets up event listeners.
     *
     * @private
     */
    setup() {
        this.onclose = this.onclose.bind(this);
        this.ondata = this.ondata.bind(this);
        this.onerror = this.onerror.bind(this);
        this.ondecoded = this.ondecoded.bind(this);
        // @ts-ignore
        this.decoder.on("decoded", this.ondecoded);
        this.conn.on("data", this.ondata);
        this.conn.on("error", this.onerror);
        this.conn.on("close", this.onclose);
        this.connectTimeout = setTimeout(() => {
            if (this.nsps.size === 0) {
                debug("no namespace joined yet, close the client");
                this.close();
            }
            else {
                debug("the client has already joined a namespace, nothing to do");
            }
        }, this.server._connectTimeout);
    }
    /**
     * Connects a client to a namespace.
     *
     * @param {String} name - the namespace
     * @param {Object} auth - the auth parameters
     * @private
     */
    connect(name, auth = {}) {
        if (this.server._nsps.has(name)) {
            debug("connecting to namespace %s", name);
            return this.doConnect(name, auth);
        }
        this.server._checkNamespace(name, auth, (dynamicNspName) => {
            if (dynamicNspName) {
                this.doConnect(name, auth);
            }
            else {
                debug("creation of namespace %s was denied", name);
                this._packet({
                    type: socket_io_parser_1.PacketType.CONNECT_ERROR,
                    nsp: name,
                    data: {
                        message: "Invalid namespace",
                    },
                });
            }
        });
    }
    /**
     * Connects a client to a namespace.
     *
     * @param name - the namespace
     * @param {Object} auth - the auth parameters
     *
     * @private
     */
    doConnect(name, auth) {
        const nsp = this.server.of(name);
        nsp._add(this, auth, (socket) => {
            this.sockets.set(socket.id, socket);
            this.nsps.set(nsp.name, socket);
            if (this.connectTimeout) {
                clearTimeout(this.connectTimeout);
                this.connectTimeout = undefined;
            }
        });
    }
    /**
     * Disconnects from all namespaces and closes transport.
     *
     * @private
     */
    _disconnect() {
        for (const socket of this.sockets.values()) {
            socket.disconnect();
        }
        this.sockets.clear();
        this.close();
    }
    /**
     * Removes a socket. Called by each `Socket`.
     *
     * @private
     */
    _remove(socket) {
        if (this.sockets.has(socket.id)) {
            const nsp = this.sockets.get(socket.id).nsp.name;
            this.sockets.delete(socket.id);
            this.nsps.delete(nsp);
        }
        else {
            debug("ignoring remove for %s", socket.id);
        }
    }
    /**
     * Closes the underlying connection.
     *
     * @private
     */
    close() {
        if ("open" === this.conn.readyState) {
            debug("forcing transport close");
            this.conn.close();
            this.onclose("forced server close");
        }
    }
    /**
     * Writes a packet to the transport.
     *
     * @param {Object} packet object
     * @param {Object} opts
     * @private
     */
    _packet(packet, opts = {}) {
        if (this.conn.readyState !== "open") {
            debug("ignoring packet write %j", packet);
            return;
        }
        const encodedPackets = opts.preEncoded
            ? packet // previous versions of the adapter incorrectly used socket.packet() instead of writeToEngine()
            : this.encoder.encode(packet);
        this.writeToEngine(encodedPackets, opts);
    }
    writeToEngine(encodedPackets, opts) {
        if (opts.volatile && !this.conn.transport.writable) {
            debug("volatile packet is discarded since the transport is not currently writable");
            return;
        }
        const packets = Array.isArray(encodedPackets)
            ? encodedPackets
            : [encodedPackets];
        for (const encodedPacket of packets) {
            this.conn.write(encodedPacket, opts);
        }
    }
    /**
     * Called with incoming transport data.
     *
     * @private
     */
    ondata(data) {
        // try/catch is needed for protocol violations (GH-1880)
        try {
            this.decoder.add(data);
        }
        catch (e) {
            debug("invalid packet format");
            this.onerror(e);
        }
    }
    /**
     * Called when parser fully decodes a packet.
     *
     * @private
     */
    ondecoded(packet) {
        let namespace;
        let authPayload;
        if (this.conn.protocol === 3) {
            const parsed = url.parse(packet.nsp, true);
            namespace = parsed.pathname;
            authPayload = parsed.query;
        }
        else {
            namespace = packet.nsp;
            authPayload = packet.data;
        }
        const socket = this.nsps.get(namespace);
        if (!socket && packet.type === socket_io_parser_1.PacketType.CONNECT) {
            this.connect(namespace, authPayload);
        }
        else if (socket &&
            packet.type !== socket_io_parser_1.PacketType.CONNECT &&
            packet.type !== socket_io_parser_1.PacketType.CONNECT_ERROR) {
            process.nextTick(function () {
                socket._onpacket(packet);
            });
        }
        else {
            debug("invalid state (packet type: %s)", packet.type);
            this.close();
        }
    }
    /**
     * Handles an error.
     *
     * @param {Object} err object
     * @private
     */
    onerror(err) {
        for (const socket of this.sockets.values()) {
            socket._onerror(err);
        }
        this.conn.close();
    }
    /**
     * Called upon transport close.
     *
     * @param reason
     * @param description
     * @private
     */
    onclose(reason, description) {
        debug("client close with reason %s", reason);
        // ignore a potential subsequent `close` event
        this.destroy();
        // `nsps` and `sockets` are cleaned up seamlessly
        for (const socket of this.sockets.values()) {
            socket._onclose(reason, description);
        }
        this.sockets.clear();
        this.decoder.destroy(); // clean up decoder
    }
    /**
     * Cleans up event listeners.
     * @private
     */
    destroy() {
        this.conn.removeListener("data", this.ondata);
        this.conn.removeListener("error", this.onerror);
        this.conn.removeListener("close", this.onclose);
        // @ts-ignore
        this.decoder.removeListener("decoded", this.ondecoded);
        if (this.connectTimeout) {
            clearTimeout(this.connectTimeout);
            this.connectTimeout = undefined;
        }
    }
}
exports.Client = Client;