Deployed the page to Github Pages.

node_modules/engine.io/build/transports/index.d.ts

@@ -0,0 +1,16 @@
+import { Polling as XHR } from "./polling";
+import { WebSocket } from "./websocket";
+import { WebTransport } from "./webtransport";
+declare const _default: {
+    polling: typeof polling;
+    websocket: typeof WebSocket;
+    webtransport: typeof WebTransport;
+};
+export default _default;
+/**
+ * Polling polymorphic constructor.
+ */
+declare function polling(req: any): XHR;
+declare namespace polling {
+    var upgradesTo: string[];
+}

node_modules/engine.io/build/transports/index.js

@@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const polling_1 = require("./polling");
+const polling_jsonp_1 = require("./polling-jsonp");
+const websocket_1 = require("./websocket");
+const webtransport_1 = require("./webtransport");
+exports.default = {
+    polling: polling,
+    websocket: websocket_1.WebSocket,
+    webtransport: webtransport_1.WebTransport,
+};
+/**
+ * Polling polymorphic constructor.
+ */
+function polling(req) {
+    if ("string" === typeof req._query.j) {
+        return new polling_jsonp_1.JSONP(req);
+    }
+    else {
+        return new polling_1.Polling(req);
+    }
+}
+polling.upgradesTo = ["websocket", "webtransport"];

node_modules/engine.io/build/transports/polling-jsonp.d.ts

@@ -0,0 +1,12 @@
+import { Polling } from "./polling";
+import type { RawData } from "engine.io-parser";
+export declare class JSONP extends Polling {
+    private readonly head;
+    private readonly foot;
+    /**
+     * JSON-P polling transport.
+     */
+    constructor(req: any);
+    onData(data: RawData): void;
+    doWrite(data: any, options: any, callback: any): void;
+}

node_modules/engine.io/build/transports/polling-jsonp.js

@@ -0,0 +1,41 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.JSONP = void 0;
+const polling_1 = require("./polling");
+const qs = require("querystring");
+const rDoubleSlashes = /\\\\n/g;
+const rSlashes = /(\\)?\\n/g;
+class JSONP extends polling_1.Polling {
+    /**
+     * JSON-P polling transport.
+     */
+    constructor(req) {
+        super(req);
+        this.head = "___eio[" + (req._query.j || "").replace(/[^0-9]/g, "") + "](";
+        this.foot = ");";
+    }
+    onData(data) {
+        // we leverage the qs module so that we get built-in DoS protection
+        // and the fast alternative to decodeURIComponent
+        data = qs.parse(data).d;
+        if ("string" === typeof data) {
+            // client will send already escaped newlines as \\\\n and newlines as \\n
+            // \\n must be replaced with \n and \\\\n with \\n
+            data = data.replace(rSlashes, function (match, slashes) {
+                return slashes ? match : "\n";
+            });
+            super.onData(data.replace(rDoubleSlashes, "\\n"));
+        }
+    }
+    doWrite(data, options, callback) {
+        // we must output valid javascript, not valid json
+        // see: http://timelessrepo.com/json-isnt-a-javascript-subset
+        const js = JSON.stringify(data)
+            .replace(/\u2028/g, "\\u2028")
+            .replace(/\u2029/g, "\\u2029");
+        // prepare response
+        data = this.head + js + this.foot;
+        super.doWrite(data, options, callback);
+    }
+}
+exports.JSONP = JSONP;

node_modules/engine.io/build/transports/polling.d.ts

@@ -0,0 +1,87 @@
+import { EngineRequest, Transport } from "../transport";
+import type { Packet, RawData } from "engine.io-parser";
+export declare class Polling extends Transport {
+    maxHttpBufferSize: number;
+    httpCompression: any;
+    private req;
+    private res;
+    private dataReq;
+    private dataRes;
+    private shouldClose;
+    private readonly closeTimeout;
+    /**
+     * HTTP polling constructor.
+     */
+    constructor(req: any);
+    /**
+     * Transport name
+     */
+    get name(): string;
+    /**
+     * Overrides onRequest.
+     *
+     * @param {EngineRequest} req
+     * @package
+     */
+    onRequest(req: EngineRequest): void;
+    /**
+     * The client sends a request awaiting for us to send data.
+     *
+     * @private
+     */
+    private onPollRequest;
+    /**
+     * The client sends a request with data.
+     *
+     * @private
+     */
+    private onDataRequest;
+    /**
+     * Processes the incoming data payload.
+     *
+     * @param data - encoded payload
+     * @protected
+     */
+    onData(data: RawData): void;
+    /**
+     * Overrides onClose.
+     *
+     * @private
+     */
+    onClose(): void;
+    send(packets: Packet[]): void;
+    /**
+     * Writes data as response to poll request.
+     *
+     * @param {String} data
+     * @param {Object} options
+     * @private
+     */
+    private write;
+    /**
+     * Performs the write.
+     *
+     * @protected
+     */
+    protected doWrite(data: any, options: any, callback: any): void;
+    /**
+     * Compresses data.
+     *
+     * @private
+     */
+    private compress;
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn: () => void): void;
+    /**
+     * Returns headers for a response.
+     *
+     * @param {http.IncomingMessage} req
+     * @param {Object} headers - extra headers
+     * @private
+     */
+    private headers;
+}

node_modules/engine.io/build/transports/polling.js

@@ -0,0 +1,332 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Polling = void 0;
+const transport_1 = require("../transport");
+const zlib_1 = require("zlib");
+const accepts = require("accepts");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:polling");
+const compressionMethods = {
+    gzip: zlib_1.createGzip,
+    deflate: zlib_1.createDeflate,
+};
+class Polling extends transport_1.Transport {
+    /**
+     * HTTP polling constructor.
+     */
+    constructor(req) {
+        super(req);
+        this.closeTimeout = 30 * 1000;
+    }
+    /**
+     * Transport name
+     */
+    get name() {
+        return "polling";
+    }
+    /**
+     * Overrides onRequest.
+     *
+     * @param {EngineRequest} req
+     * @package
+     */
+    onRequest(req) {
+        const res = req.res;
+        // remove the reference to the ServerResponse object (as the first request of the session is kept in memory by default)
+        req.res = null;
+        if ("GET" === req.method) {
+            this.onPollRequest(req, res);
+        }
+        else if ("POST" === req.method) {
+            this.onDataRequest(req, res);
+        }
+        else {
+            res.writeHead(500);
+            res.end();
+        }
+    }
+    /**
+     * The client sends a request awaiting for us to send data.
+     *
+     * @private
+     */
+    onPollRequest(req, res) {
+        if (this.req) {
+            debug("request overlap");
+            // assert: this.res, '.req and .res should be (un)set together'
+            this.onError("overlap from client");
+            res.writeHead(400);
+            res.end();
+            return;
+        }
+        debug("setting request");
+        this.req = req;
+        this.res = res;
+        const onClose = () => {
+            this.onError("poll connection closed prematurely");
+        };
+        const cleanup = () => {
+            req.removeListener("close", onClose);
+            this.req = this.res = null;
+        };
+        req.cleanup = cleanup;
+        req.on("close", onClose);
+        this.writable = true;
+        this.emit("ready");
+        // if we're still writable but had a pending close, trigger an empty send
+        if (this.writable && this.shouldClose) {
+            debug("triggering empty send to append close packet");
+            this.send([{ type: "noop" }]);
+        }
+    }
+    /**
+     * The client sends a request with data.
+     *
+     * @private
+     */
+    onDataRequest(req, res) {
+        if (this.dataReq) {
+            // assert: this.dataRes, '.dataReq and .dataRes should be (un)set together'
+            this.onError("data request overlap from client");
+            res.writeHead(400);
+            res.end();
+            return;
+        }
+        const isBinary = "application/octet-stream" === req.headers["content-type"];
+        if (isBinary && this.protocol === 4) {
+            return this.onError("invalid content");
+        }
+        this.dataReq = req;
+        this.dataRes = res;
+        let chunks = isBinary ? Buffer.concat([]) : "";
+        const cleanup = () => {
+            req.removeListener("data", onData);
+            req.removeListener("end", onEnd);
+            req.removeListener("close", onClose);
+            this.dataReq = this.dataRes = chunks = null;
+        };
+        const onClose = () => {
+            cleanup();
+            this.onError("data request connection closed prematurely");
+        };
+        const onData = (data) => {
+            let contentLength;
+            if (isBinary) {
+                chunks = Buffer.concat([chunks, data]);
+                contentLength = chunks.length;
+            }
+            else {
+                chunks += data;
+                contentLength = Buffer.byteLength(chunks);
+            }
+            if (contentLength > this.maxHttpBufferSize) {
+                res.writeHead(413).end();
+                cleanup();
+            }
+        };
+        const onEnd = () => {
+            this.onData(chunks);
+            const headers = {
+                // text/html is required instead of text/plain to avoid an
+                // unwanted download dialog on certain user-agents (GH-43)
+                "Content-Type": "text/html",
+                "Content-Length": "2",
+            };
+            res.writeHead(200, this.headers(req, headers));
+            res.end("ok");
+            cleanup();
+        };
+        req.on("close", onClose);
+        if (!isBinary)
+            req.setEncoding("utf8");
+        req.on("data", onData);
+        req.on("end", onEnd);
+    }
+    /**
+     * Processes the incoming data payload.
+     *
+     * @param data - encoded payload
+     * @protected
+     */
+    onData(data) {
+        debug('received "%s"', data);
+        const callback = (packet) => {
+            if ("close" === packet.type) {
+                debug("got xhr close packet");
+                this.onClose();
+                return false;
+            }
+            this.onPacket(packet);
+        };
+        if (this.protocol === 3) {
+            this.parser.decodePayload(data, callback);
+        }
+        else {
+            this.parser.decodePayload(data).forEach(callback);
+        }
+    }
+    /**
+     * Overrides onClose.
+     *
+     * @private
+     */
+    onClose() {
+        if (this.writable) {
+            // close pending poll request
+            this.send([{ type: "noop" }]);
+        }
+        super.onClose();
+    }
+    send(packets) {
+        this.writable = false;
+        if (this.shouldClose) {
+            debug("appending close packet to payload");
+            packets.push({ type: "close" });
+            this.shouldClose();
+            this.shouldClose = null;
+        }
+        const doWrite = (data) => {
+            const compress = packets.some((packet) => {
+                return packet.options && packet.options.compress;
+            });
+            this.write(data, { compress });
+        };
+        if (this.protocol === 3) {
+            this.parser.encodePayload(packets, this.supportsBinary, doWrite);
+        }
+        else {
+            this.parser.encodePayload(packets, doWrite);
+        }
+    }
+    /**
+     * Writes data as response to poll request.
+     *
+     * @param {String} data
+     * @param {Object} options
+     * @private
+     */
+    write(data, options) {
+        debug('writing "%s"', data);
+        this.doWrite(data, options, () => {
+            this.req.cleanup();
+            this.emit("drain");
+        });
+    }
+    /**
+     * Performs the write.
+     *
+     * @protected
+     */
+    doWrite(data, options, callback) {
+        // explicit UTF-8 is required for pages not served under utf
+        const isString = typeof data === "string";
+        const contentType = isString
+            ? "text/plain; charset=UTF-8"
+            : "application/octet-stream";
+        const headers = {
+            "Content-Type": contentType,
+        };
+        const respond = (data) => {
+            headers["Content-Length"] =
+                "string" === typeof data ? Buffer.byteLength(data) : data.length;
+            this.res.writeHead(200, this.headers(this.req, headers));
+            this.res.end(data);
+            callback();
+        };
+        if (!this.httpCompression || !options.compress) {
+            respond(data);
+            return;
+        }
+        const len = isString ? Buffer.byteLength(data) : data.length;
+        if (len < this.httpCompression.threshold) {
+            respond(data);
+            return;
+        }
+        const encoding = accepts(this.req).encodings(["gzip", "deflate"]);
+        if (!encoding) {
+            respond(data);
+            return;
+        }
+        this.compress(data, encoding, (err, data) => {
+            if (err) {
+                this.res.writeHead(500);
+                this.res.end();
+                callback(err);
+                return;
+            }
+            headers["Content-Encoding"] = encoding;
+            respond(data);
+        });
+    }
+    /**
+     * Compresses data.
+     *
+     * @private
+     */
+    compress(data, encoding, callback) {
+        debug("compressing");
+        const buffers = [];
+        let nread = 0;
+        compressionMethods[encoding](this.httpCompression)
+            .on("error", callback)
+            .on("data", function (chunk) {
+            buffers.push(chunk);
+            nread += chunk.length;
+        })
+            .on("end", function () {
+            callback(null, Buffer.concat(buffers, nread));
+        })
+            .end(data);
+    }
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn) {
+        debug("closing");
+        let closeTimeoutTimer;
+        if (this.dataReq) {
+            debug("aborting ongoing data request");
+            this.dataReq.destroy();
+        }
+        const onClose = () => {
+            clearTimeout(closeTimeoutTimer);
+            fn();
+            this.onClose();
+        };
+        if (this.writable) {
+            debug("transport writable - closing right away");
+            this.send([{ type: "close" }]);
+            onClose();
+        }
+        else if (this.discarded) {
+            debug("transport discarded - closing right away");
+            onClose();
+        }
+        else {
+            debug("transport not writable - buffering orderly close");
+            this.shouldClose = onClose;
+            closeTimeoutTimer = setTimeout(onClose, this.closeTimeout);
+        }
+    }
+    /**
+     * Returns headers for a response.
+     *
+     * @param {http.IncomingMessage} req
+     * @param {Object} headers - extra headers
+     * @private
+     */
+    headers(req, headers = {}) {
+        // prevent XSS warnings on IE
+        // https://github.com/LearnBoost/socket.io/pull/1333
+        const ua = req.headers["user-agent"];
+        if (ua && (~ua.indexOf(";MSIE") || ~ua.indexOf("Trident/"))) {
+            headers["X-XSS-Protection"] = "0";
+        }
+        headers["cache-control"] = "no-store";
+        this.emit("headers", headers, req);
+        return headers;
+    }
+}
+exports.Polling = Polling;

node_modules/engine.io/build/transports/websocket.d.ts

@@ -0,0 +1,32 @@
+import { EngineRequest, Transport } from "../transport";
+import type { Packet } from "engine.io-parser";
+export declare class WebSocket extends Transport {
+    protected perMessageDeflate: any;
+    private socket;
+    /**
+     * WebSocket transport
+     *
+     * @param {EngineRequest} req
+     */
+    constructor(req: EngineRequest);
+    /**
+     * Transport name
+     */
+    get name(): string;
+    /**
+     * Advertise upgrade support.
+     */
+    get handlesUpgrades(): boolean;
+    send(packets: Packet[]): void;
+    /**
+     * Whether the encoding of the WebSocket frame can be skipped.
+     * @param packet
+     * @private
+     */
+    private _canSendPreEncodedFrame;
+    private _doSend;
+    private _doSendLast;
+    private _onSent;
+    private _onSentLast;
+    doClose(fn?: () => void): void;
+}

node_modules/engine.io/build/transports/websocket.js

@@ -0,0 +1,94 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WebSocket = void 0;
+const transport_1 = require("../transport");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:ws");
+class WebSocket extends transport_1.Transport {
+    /**
+     * WebSocket transport
+     *
+     * @param {EngineRequest} req
+     */
+    constructor(req) {
+        super(req);
+        this._doSend = (data) => {
+            this.socket.send(data, this._onSent);
+        };
+        this._doSendLast = (data) => {
+            this.socket.send(data, this._onSentLast);
+        };
+        this._onSent = (err) => {
+            if (err) {
+                this.onError("write error", err.stack);
+            }
+        };
+        this._onSentLast = (err) => {
+            if (err) {
+                this.onError("write error", err.stack);
+            }
+            else {
+                this.emit("drain");
+                this.writable = true;
+                this.emit("ready");
+            }
+        };
+        this.socket = req.websocket;
+        this.socket.on("message", (data, isBinary) => {
+            const message = isBinary ? data : data.toString();
+            debug('received "%s"', message);
+            super.onData(message);
+        });
+        this.socket.once("close", this.onClose.bind(this));
+        this.socket.on("error", this.onError.bind(this));
+        this.writable = true;
+        this.perMessageDeflate = null;
+    }
+    /**
+     * Transport name
+     */
+    get name() {
+        return "websocket";
+    }
+    /**
+     * Advertise upgrade support.
+     */
+    get handlesUpgrades() {
+        return true;
+    }
+    send(packets) {
+        this.writable = false;
+        for (let i = 0; i < packets.length; i++) {
+            const packet = packets[i];
+            const isLast = i + 1 === packets.length;
+            if (this._canSendPreEncodedFrame(packet)) {
+                // the WebSocket frame was computed with WebSocket.Sender.frame()
+                // see https://github.com/websockets/ws/issues/617#issuecomment-283002469
+                this.socket._sender.sendFrame(
+                // @ts-ignore
+                packet.options.wsPreEncodedFrame, isLast ? this._onSentLast : this._onSent);
+            }
+            else {
+                this.parser.encodePacket(packet, this.supportsBinary, isLast ? this._doSendLast : this._doSend);
+            }
+        }
+    }
+    /**
+     * Whether the encoding of the WebSocket frame can be skipped.
+     * @param packet
+     * @private
+     */
+    _canSendPreEncodedFrame(packet) {
+        var _a, _b, _c;
+        return (!this.perMessageDeflate &&
+            typeof ((_b = (_a = this.socket) === null || _a === void 0 ? void 0 : _a._sender) === null || _b === void 0 ? void 0 : _b.sendFrame) === "function" &&
+            // @ts-ignore
+            ((_c = packet.options) === null || _c === void 0 ? void 0 : _c.wsPreEncodedFrame) !== undefined);
+    }
+    doClose(fn) {
+        debug("closing");
+        this.socket.close();
+        fn && fn();
+    }
+}
+exports.WebSocket = WebSocket;

node_modules/engine.io/build/transports/webtransport.d.ts

@@ -0,0 +1,12 @@
+import { Transport } from "../transport";
+/**
+ * Reference: https://developer.mozilla.org/en-US/docs/Web/API/WebTransport_API
+ */
+export declare class WebTransport extends Transport {
+    private readonly session;
+    private readonly writer;
+    constructor(session: any, stream: any, reader: any);
+    get name(): string;
+    send(packets: any): Promise<void>;
+    doClose(fn: any): void;
+}

node_modules/engine.io/build/transports/webtransport.js

@@ -0,0 +1,63 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WebTransport = void 0;
+const transport_1 = require("../transport");
+const debug_1 = require("debug");
+const engine_io_parser_1 = require("engine.io-parser");
+const debug = (0, debug_1.default)("engine:webtransport");
+/**
+ * Reference: https://developer.mozilla.org/en-US/docs/Web/API/WebTransport_API
+ */
+class WebTransport extends transport_1.Transport {
+    constructor(session, stream, reader) {
+        super({ _query: { EIO: "4" } });
+        this.session = session;
+        const transformStream = (0, engine_io_parser_1.createPacketEncoderStream)();
+        transformStream.readable.pipeTo(stream.writable).catch(() => {
+            debug("the stream was closed");
+        });
+        this.writer = transformStream.writable.getWriter();
+        (async () => {
+            try {
+                while (true) {
+                    const { value, done } = await reader.read();
+                    if (done) {
+                        debug("session is closed");
+                        break;
+                    }
+                    debug("received chunk: %o", value);
+                    this.onPacket(value);
+                }
+            }
+            catch (e) {
+                debug("error while reading: %s", e.message);
+            }
+        })();
+        session.closed.then(() => this.onClose());
+        this.writable = true;
+    }
+    get name() {
+        return "webtransport";
+    }
+    async send(packets) {
+        this.writable = false;
+        try {
+            for (let i = 0; i < packets.length; i++) {
+                const packet = packets[i];
+                await this.writer.write(packet);
+            }
+        }
+        catch (e) {
+            debug("error while writing: %s", e.message);
+        }
+        this.emit("drain");
+        this.writable = true;
+        this.emit("ready");
+    }
+    doClose(fn) {
+        debug("closing WebTransport session");
+        this.session.close();
+        fn && fn();
+    }
+}
+exports.WebTransport = WebTransport;