代码

CloudFlare_Workers_and_Pages/_worker.js
// <!--GAMFC-->version base on commit 43fad05dcdae3b723c53c226f8181fc5bd47223e, time is 2023-06-22 15:20:02 UTC<!--GAMFC-END-->.
// @ts-ignore
import { connect } from 'cloudflare:sockets';

// How to generate your own UUID:
// [Windows] Press "Win + R", input cmd and run:  Powershell -NoExit -Command "[guid]::NewGuid()"
let userID = '6df4cb4a-06a5-4c6b-84c0-227b700a7f0f';

const proxyIPs = ['cdn-all.xn--b6gac.eu.org', 'cdn.xn--b6gac.eu.org', 'cdn-b100.xn--b6gac.eu.org', 'edgetunnel.anycast.eu.org', 'cdn.anycast.eu.org'];
let proxyIP = proxyIPs[Math.floor(Math.random() * proxyIPs.length)];

let dohURL = 'https://sky.rethinkdns.com/1:-Pf_____9_8A_AMAIgE8kMABVDDmKOHTAKg='; // https://cloudflare-dns.com/dns-query or https://dns.google/dns-query

// v2board api environment variables
let nodeId = ''; // 1

let apiToken = ''; //abcdefghijklmnopqrstuvwxyz123456

let apiHost = ''; // api.v2board.com

if (!isValidUUID(userID)) {
    throw new Error('uuid is not valid');
}

export default {
    /**
     * @param {import("@cloudflare/workers-types").Request} request
     * @param {{UUID: string, PROXYIP: string, DNS_RESOLVER_URL: string, NODE_ID: int, API_HOST: string, API_TOKEN: string}} env
     * @param {import("@cloudflare/workers-types").ExecutionContext} ctx
     * @returns {Promise<Response>}
     */
    async fetch(request, env, ctx) {
        try {
            userID = env.UUID || userID;
            proxyIP = env.PROXYIP || proxyIP;
            dohURL = env.DNS_RESOLVER_URL || dohURL;
            nodeId = env.NODE_ID || nodeId;
            apiToken = env.API_TOKEN || apiToken;
            apiHost = env.API_HOST || apiHost;
            const upgradeHeader = request.headers.get('Upgrade');
            if (!upgradeHeader || upgradeHeader !== 'websocket') {
                const url = new URL(request.url);
                switch (url.pathname) {
                    case '/cf':
                        return new Response(JSON.stringify(request.cf, null, 4), {
                            status: 200,
                            headers: {
                                "Content-Type": "application/json;charset=utf-8",
                            },
                        });
                    case '/connect': // for test connect to cf socket
                        const [hostname, port] = ['cloudflare.com', '80'];
                        console.log(`Connecting to ${hostname}:${port}...`);

                        try {
                            const socket = await connect({
                                hostname: hostname,
                                port: parseInt(port, 10),
                            });

                            const writer = socket.writable.getWriter();

                            try {
                                await writer.write(new TextEncoder().encode('GET / HTTP/1.1\r\nHost: ' + hostname + '\r\n\r\n'));
                            } catch (writeError) {
                                writer.releaseLock();
                                await socket.close();
                                return new Response(writeError.message, { status: 500 });
                            }

                            writer.releaseLock();

                            const reader = socket.readable.getReader();
                            let value;

                            try {
                                const result = await reader.read();
                                value = result.value;
                            } catch (readError) {
                                await reader.releaseLock();
                                await socket.close();
                                return new Response(readError.message, { status: 500 });
                            }

                            await reader.releaseLock();
                            await socket.close();

                            return new Response(new TextDecoder().decode(value), { status: 200 });
                        } catch (connectError) {
                            return new Response(connectError.message, { status: 500 });
                        }
                    case `/${userID}`: {
                        const vlessConfig = getVLESSConfig(userID, request.headers.get('Host'));
                        return new Response(`${vlessConfig}`, {
                            status: 200,
                            headers: {
                                "Content-Type": "text/plain;charset=utf-8",
                            }
                        });
                    }
                    default:
                        // return new Response('Not found', { status: 404 });
                        // For any other path, reverse proxy to 'maimai.sega.jp' and return the original response
                        url.hostname = 'maimai.sega.jp';
                        url.protocol = 'https:';
                        request = new Request(url, request);
                        return await fetch(request);
                }
            } else {
                return await vlessOverWSHandler(request);
            }
        } catch (err) {
			/** @type {Error} */ let e = err;
            return new Response(e.toString());
        }
    },
};




/**
 * 
 * @param {import("@cloudflare/workers-types").Request} request
 */
async function vlessOverWSHandler(request) {

    /** @type {import("@cloudflare/workers-types").WebSocket[]} */
    // @ts-ignore
    const webSocketPair = new WebSocketPair();
    const [client, webSocket] = Object.values(webSocketPair);

    webSocket.accept();

    let address = '';
    let portWithRandomLog = '';
    const log = (/** @type {string} */ info, /** @type {string | undefined} */ event) => {
        console.log(`[${address}:${portWithRandomLog}] ${info}`, event || '');
    };
    const earlyDataHeader = request.headers.get('sec-websocket-protocol') || '';

    const readableWebSocketStream = makeReadableWebSocketStream(webSocket, earlyDataHeader, log);

    /** @type {{ value: import("@cloudflare/workers-types").Socket | null}}*/
    let remoteSocketWapper = {
        value: null,
    };
    let udpStreamWrite = null;
    let isDns = false;

    // ws --> remote
    readableWebSocketStream.pipeTo(new WritableStream({
        async write(chunk, controller) {
            if (isDns && udpStreamWrite) {
                return udpStreamWrite(chunk);
            }
            if (remoteSocketWapper.value) {
                const writer = remoteSocketWapper.value.writable.getWriter()
                await writer.write(chunk);
                writer.releaseLock();
                return;
            }

            const {
                hasError,
                message,
                portRemote = 443,
                addressRemote = '',
                rawDataIndex,
                vlessVersion = new Uint8Array([0, 0]),
                isUDP,
            } = await processVlessHeader(chunk, userID);
            address = addressRemote;
            portWithRandomLog = `${portRemote}--${Math.random()} ${isUDP ? 'udp ' : 'tcp '
                } `;
            if (hasError) {
                // controller.error(message);
                throw new Error(message); // cf seems has bug, controller.error will not end stream
                // webSocket.close(1000, message);
                return;
            }
            // if UDP but port not DNS port, close it
            if (isUDP) {
                if (portRemote === 53) {
                    isDns = true;
                } else {
                    // controller.error('UDP proxy only enable for DNS which is port 53');
                    throw new Error('UDP proxy only enable for DNS which is port 53'); // cf seems has bug, controller.error will not end stream
                    return;
                }
            }
            // ["version", "附加信息长度 N"]
            const vlessResponseHeader = new Uint8Array([vlessVersion[0], 0]);
            const rawClientData = chunk.slice(rawDataIndex);

            // TODO: support udp here when cf runtime has udp support
            if (isDns) {
                const { write } = await handleUDPOutBound(webSocket, vlessResponseHeader, log);
                udpStreamWrite = write;
                udpStreamWrite(rawClientData);
                return;
            }
            handleTCPOutBound(remoteSocketWapper, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log);
        },
        close() {
            log(`readableWebSocketStream is close`);
        },
        abort(reason) {
            log(`readableWebSocketStream is abort`, JSON.stringify(reason));
        },
    })).catch((err) => {
        log('readableWebSocketStream pipeTo error', err);
    });

    return new Response(null, {
        status: 101,
        // @ts-ignore
        webSocket: client,
    });
}

let apiResponseCache = null;
let cacheTimeout = null;

/**
 * Fetches the API response from the server and caches it for future use.
 * @returns {Promise<object|null>} A Promise that resolves to the API response object or null if there was an error.
 */
async function fetchApiResponse() {
    const requestOptions = {
        method: 'GET',
        redirect: 'follow'
    };

    try {
        const response = await fetch(`https://${apiHost}/api/v1/server/UniProxy/user?node_id=${nodeId}&node_type=v2ray&token=${apiToken}`, requestOptions);

        if (!response.ok) {
            console.error('Error: Network response was not ok');
            return null;
        }
        const apiResponse = await response.json();
        apiResponseCache = apiResponse;

        // Refresh the cache every 5 minutes (300000 milliseconds)
        if (cacheTimeout) {
            clearTimeout(cacheTimeout);
        }
        cacheTimeout = setTimeout(() => fetchApiResponse(), 300000);

        return apiResponse;
    } catch (error) {
        console.error('Error:', error);
        return null;
    }
}

/**
 * Returns the cached API response if it exists, otherwise fetches the API response from the server and caches it for future use.
 * @returns {Promise<object|null>} A Promise that resolves to the cached API response object or the fetched API response object, or null if there was an error.
 */
async function getApiResponse() {
    if (!apiResponseCache) {
        return await fetchApiResponse();
    }
    return apiResponseCache;
}

/**
 * Checks if a given UUID is present in the API response.
 * @param {string} targetUuid The UUID to search for.
 * @returns {Promise<boolean>} A Promise that resolves to true if the UUID is present in the API response, false otherwise.
 */
async function checkUuidInApiResponse(targetUuid) {
    // Check if any of the environment variables are empty
    if (!nodeId || !apiToken || !apiHost) {
        return false;
    }

    try {
        const apiResponse = await getApiResponse();
        if (!apiResponse) {
            return false;
        }
        const isUuidInResponse = apiResponse.users.some(user => user.uuid === targetUuid);
        return isUuidInResponse;
    } catch (error) {
        console.error('Error:', error);
        return false;
    }
}

// Usage example:
//   const targetUuid = "65590e04-a94c-4c59-a1f2-571bce925aad";
//   checkUuidInApiResponse(targetUuid).then(result => console.log(result));

/**
 * Handles outbound TCP connections.
 *
 * @param {any} remoteSocket 
 * @param {string} addressRemote The remote address to connect to.
 * @param {number} portRemote The remote port to connect to.
 * @param {Uint8Array} rawClientData The raw client data to write.
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket The WebSocket to pass the remote socket to.
 * @param {Uint8Array} vlessResponseHeader The VLESS response header.
 * @param {function} log The logging function.
 * @returns {Promise<void>} The remote socket.
 */
async function handleTCPOutBound(remoteSocket, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log,) {
    async function connectAndWrite(address, port) {
        /** @type {import("@cloudflare/workers-types").Socket} */
        const tcpSocket = connect({
            hostname: address,
            port: port,
        });
        remoteSocket.value = tcpSocket;
        log(`connected to ${address}:${port}`);
        const writer = tcpSocket.writable.getWriter();
        await writer.write(rawClientData); // first write, nomal is tls client hello
        writer.releaseLock();
        return tcpSocket;
    }

    // if the cf connect tcp socket have no incoming data, we retry to redirect ip
    async function retry() {
        const tcpSocket = await connectAndWrite(proxyIP || addressRemote, portRemote)
        // no matter retry success or not, close websocket
        tcpSocket.closed.catch(error => {
            console.log('retry tcpSocket closed error', error);
        }).finally(() => {
            safeCloseWebSocket(webSocket);
        })
        remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, null, log);
    }

    const tcpSocket = await connectAndWrite(addressRemote, portRemote);

    // when remoteSocket is ready, pass to websocket
    // remote--> ws
    remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, retry, log);
}

/**
 * 
 * @param {import("@cloudflare/workers-types").WebSocket} webSocketServer
 * @param {string} earlyDataHeader for ws 0rtt
 * @param {(info: string)=> void} log for ws 0rtt
 */
function makeReadableWebSocketStream(webSocketServer, earlyDataHeader, log) {
    let readableStreamCancel = false;
    const stream = new ReadableStream({
        start(controller) {
            webSocketServer.addEventListener('message', (event) => {
                if (readableStreamCancel) {
                    return;
                }
                const message = event.data;
                controller.enqueue(message);
            });

            // The event means that the client closed the client -> server stream.
            // However, the server -> client stream is still open until you call close() on the server side.
            // The WebSocket protocol says that a separate close message must be sent in each direction to fully close the socket.
            webSocketServer.addEventListener('close', () => {
                // client send close, need close server
                // if stream is cancel, skip controller.close
                safeCloseWebSocket(webSocketServer);
                if (readableStreamCancel) {
                    return;
                }
                controller.close();
            }
            );
            webSocketServer.addEventListener('error', (err) => {
                log('webSocketServer has error');
                controller.error(err);
            }
            );
            // for ws 0rtt
            const { earlyData, error } = base64ToArrayBuffer(earlyDataHeader);
            if (error) {
                controller.error(error);
            } else if (earlyData) {
                controller.enqueue(earlyData);
            }
        },

        pull(controller) {
            // if ws can stop read if stream is full, we can implement backpressure
            // https://streams.spec.whatwg.org/#example-rs-push-backpressure
        },
        cancel(reason) {
            // 1. pipe WritableStream has error, this cancel will called, so ws handle server close into here
            // 2. if readableStream is cancel, all controller.close/enqueue need skip,
            // 3. but from testing controller.error still work even if readableStream is cancel
            if (readableStreamCancel) {
                return;
            }
            log(`ReadableStream was canceled, due to ${reason}`)
            readableStreamCancel = true;
            safeCloseWebSocket(webSocketServer);
        }
    });

    return stream;

}

// https://xtls.github.io/development/protocols/vless.html
// https://github.com/zizifn/excalidraw-backup/blob/main/v2ray-protocol.excalidraw

/**
 * 
 * @param { ArrayBuffer} vlessBuffer 
 * @param {string} userID 
 * @returns 
 */
async function processVlessHeader(
    vlessBuffer,
    userID
) {
    if (vlessBuffer.byteLength < 24) {
        return {
            hasError: true,
            message: 'invalid data',
        };
    }
    const version = new Uint8Array(vlessBuffer.slice(0, 1));
    let isValidUser = false;
    let isUDP = false;
    const slicedBuffer = new Uint8Array(vlessBuffer.slice(1, 17));
    const slicedBufferString = stringify(slicedBuffer);

    const uuids = userID.includes(',') ? userID.split(",") : [userID];

    const checkUuidInApi = await checkUuidInApiResponse(slicedBufferString);
    isValidUser = uuids.some(userUuid => checkUuidInApi || slicedBufferString === userUuid.trim());

    console.log(`checkUuidInApi: ${await checkUuidInApiResponse(slicedBufferString)}, userID: ${slicedBufferString}`);

    if (!isValidUser) {
        return {
            hasError: true,
            message: 'invalid user',
        };
    }

    const optLength = new Uint8Array(vlessBuffer.slice(17, 18))[0];
    //skip opt for now

    const command = new Uint8Array(
        vlessBuffer.slice(18 + optLength, 18 + optLength + 1)
    )[0];

    // 0x01 TCP
    // 0x02 UDP
    // 0x03 MUX
    if (command === 1) {
    } else if (command === 2) {
        isUDP = true;
    } else {
        return {
            hasError: true,
            message: `command ${command} is not support, command 01-tcp,02-udp,03-mux`,
        };
    }
    const portIndex = 18 + optLength + 1;
    const portBuffer = vlessBuffer.slice(portIndex, portIndex + 2);
    // port is big-Endian in raw data etc 80 == 0x005d
    const portRemote = new DataView(portBuffer).getUint16(0);

    let addressIndex = portIndex + 2;
    const addressBuffer = new Uint8Array(
        vlessBuffer.slice(addressIndex, addressIndex + 1)
    );

    // 1--> ipv4  addressLength =4
    // 2--> domain name addressLength=addressBuffer[1]
    // 3--> ipv6  addressLength =16
    const addressType = addressBuffer[0];
    let addressLength = 0;
    let addressValueIndex = addressIndex + 1;
    let addressValue = '';
    switch (addressType) {
        case 1:
            addressLength = 4;
            addressValue = new Uint8Array(
                vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
            ).join('.');
            break;
        case 2:
            addressLength = new Uint8Array(
                vlessBuffer.slice(addressValueIndex, addressValueIndex + 1)
            )[0];
            addressValueIndex += 1;
            addressValue = new TextDecoder().decode(
                vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
            );
            break;
        case 3:
            addressLength = 16;
            const dataView = new DataView(
                vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
            );
            // 2001:0db8:85a3:0000:0000:8a2e:0370:7334
            const ipv6 = [];
            for (let i = 0; i < 8; i++) {
                ipv6.push(dataView.getUint16(i * 2).toString(16));
            }
            addressValue = ipv6.join(':');
            // seems no need add [] for ipv6
            break;
        default:
            return {
                hasError: true,
                message: `invild  addressType is ${addressType}`,
            };
    }
    if (!addressValue) {
        return {
            hasError: true,
            message: `addressValue is empty, addressType is ${addressType}`,
        };
    }

    return {
        hasError: false,
        addressRemote: addressValue,
        addressType,
        portRemote,
        rawDataIndex: addressValueIndex + addressLength,
        vlessVersion: version,
        isUDP,
    };
}


/**
 * 
 * @param {import("@cloudflare/workers-types").Socket} remoteSocket 
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket 
 * @param {ArrayBuffer} vlessResponseHeader 
 * @param {(() => Promise<void>) | null} retry
 * @param {*} log 
 */
async function remoteSocketToWS(remoteSocket, webSocket, vlessResponseHeader, retry, log) {
    // remote--> ws
    let remoteChunkCount = 0;
    let chunks = [];
    /** @type {ArrayBuffer | null} */
    let vlessHeader = vlessResponseHeader;
    let hasIncomingData = false; // check if remoteSocket has incoming data
    await remoteSocket.readable
        .pipeTo(
            new WritableStream({
                start() {
                },
                /**
                 * 
                 * @param {Uint8Array} chunk 
                 * @param {*} controller 
                 */
                async write(chunk, controller) {
                    hasIncomingData = true;
                    // remoteChunkCount++;
                    if (webSocket.readyState !== WS_READY_STATE_OPEN) {
                        controller.error(
                            'webSocket.readyState is not open, maybe close'
                        );
                    }
                    if (vlessHeader) {
                        webSocket.send(await new Blob([vlessHeader, chunk]).arrayBuffer());
                        vlessHeader = null;
                    } else {
                        // seems no need rate limit this, CF seems fix this??..
                        // if (remoteChunkCount > 20000) {
                        // 	// cf one package is 4096 byte(4kb),  4096 * 20000 = 80M
                        // 	await delay(1);
                        // }
                        webSocket.send(chunk);
                    }
                },
                close() {
                    log(`remoteConnection!.readable is close with hasIncomingData is ${hasIncomingData}`);
                    // safeCloseWebSocket(webSocket); // no need server close websocket frist for some case will casue HTTP ERR_CONTENT_LENGTH_MISMATCH issue, client will send close event anyway.
                },
                abort(reason) {
                    console.error(`remoteConnection!.readable abort`, reason);
                },
            })
        )
        .catch((error) => {
            console.error(
                `remoteSocketToWS has exception `,
                error.stack || error
            );
            safeCloseWebSocket(webSocket);
        });

    // seems is cf connect socket have error,
    // 1. Socket.closed will have error
    // 2. Socket.readable will be close without any data coming
    if (hasIncomingData === false && retry) {
        log(`retry`)
        retry();
    }
}

/**
 * 
 * @param {string} base64Str 
 * @returns 
 */
function base64ToArrayBuffer(base64Str) {
    if (!base64Str) {
        return { error: null };
    }
    try {
        // go use modified Base64 for URL rfc4648 which js atob not support
        base64Str = base64Str.replace(/-/g, '+').replace(/_/g, '/');
        const decode = atob(base64Str);
        const arryBuffer = Uint8Array.from(decode, (c) => c.charCodeAt(0));
        return { earlyData: arryBuffer.buffer, error: null };
    } catch (error) {
        return { error };
    }
}

/**
 * This is not real UUID validation
 * @param {string} uuid 
 */
function isValidUUID(uuid) {
    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[4][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
    return uuidRegex.test(uuid);
}

const WS_READY_STATE_OPEN = 1;
const WS_READY_STATE_CLOSING = 2;
/**
 * Normally, WebSocket will not has exceptions when close.
 * @param {import("@cloudflare/workers-types").WebSocket} socket
 */
function safeCloseWebSocket(socket) {
    try {
        if (socket.readyState === WS_READY_STATE_OPEN || socket.readyState === WS_READY_STATE_CLOSING) {
            socket.close();
        }
    } catch (error) {
        console.error('safeCloseWebSocket error', error);
    }
}

const byteToHex = [];
for (let i = 0; i < 256; ++i) {
    byteToHex.push((i + 256).toString(16).slice(1));
}
function unsafeStringify(arr, offset = 0) {
    return (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + "-" + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + "-" + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + "-" + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + "-" + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase();
}
function stringify(arr, offset = 0) {
    const uuid = unsafeStringify(arr, offset);
    if (!isValidUUID(uuid)) {
        throw TypeError("Stringified UUID is invalid");
    }
    return uuid;
}


/**
 * 
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket 
 * @param {ArrayBuffer} vlessResponseHeader 
 * @param {(string)=> void} log 
 */
async function handleUDPOutBound(webSocket, vlessResponseHeader, log) {

    let isVlessHeaderSent = false;
    const transformStream = new TransformStream({
        start(controller) {

        },
        transform(chunk, controller) {
            // udp message 2 byte is the the length of udp data
            // TODO: this should have bug, beacsue maybe udp chunk can be in two websocket message
            for (let index = 0; index < chunk.byteLength;) {
                const lengthBuffer = chunk.slice(index, index + 2);
                const udpPakcetLength = new DataView(lengthBuffer).getUint16(0);
                const udpData = new Uint8Array(
                    chunk.slice(index + 2, index + 2 + udpPakcetLength)
                );
                index = index + 2 + udpPakcetLength;
                controller.enqueue(udpData);
            }
        },
        flush(controller) {
        }
    });

    // only handle dns udp for now
    transformStream.readable.pipeTo(new WritableStream({
        async write(chunk) {
            const resp = await fetch(dohURL, // dns server url
                {
                    method: 'POST',
                    headers: {
                        'content-type': 'application/dns-message',
                    },
                    body: chunk,
                })
            const dnsQueryResult = await resp.arrayBuffer();
            const udpSize = dnsQueryResult.byteLength;
            // console.log([...new Uint8Array(dnsQueryResult)].map((x) => x.toString(16)));
            const udpSizeBuffer = new Uint8Array([(udpSize >> 8) & 0xff, udpSize & 0xff]);
            if (webSocket.readyState === WS_READY_STATE_OPEN) {
                log(`doh success and dns message length is ${udpSize}`);
                if (isVlessHeaderSent) {
                    webSocket.send(await new Blob([udpSizeBuffer, dnsQueryResult]).arrayBuffer());
                } else {
                    webSocket.send(await new Blob([vlessResponseHeader, udpSizeBuffer, dnsQueryResult]).arrayBuffer());
                    isVlessHeaderSent = true;
                }
            }
        }
    })).catch((error) => {
        log('dns udp has error' + error)
    });

    const writer = transformStream.writable.getWriter();

    return {
        /**
         * 
         * @param {Uint8Array} chunk 
         */
        write(chunk) {
            writer.write(chunk);
        }
    };
}

/**
 * 
 * @param {string} userID 
 * @param {string | null} hostName
 * @returns {string}
 */
function getVLESSConfig(userID, hostName) {
    const vlessLink = `vless://${userID}@${hostName}:80?encryption=none&security=none&fp=randomized&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}`
    const vlessTlsLink = `vless://${userID}@${hostName}:443?encryption=none&security=tls&sni=${hostName}&fp=randomized&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}`
    return `
下面是非 TLS 端口的节点信息及分享链接,可使用 CF 支持的非 TLS 端口:

地址:${hostName} 或 CF 优选 IP
端口:80 或 CF 支持的非 TLS 端口
UUID:${userID}
传输:ws
伪装域名:${hostName}
路径:/?ed=2048

${vlessLink}

下面是 TLS 端口的节点信息及分享链接,可使用 CF 支持的 TLS 端口:

地址:${hostName} 或 CF 优选 IP
端口:443 或 CF 支持的 TLS 端口
UUID:${userID}
传输:ws
传输层安全:TLS
伪装域名:${hostName}
路径:/?ed=2048
SNI 域名:${hostName}

${vlessTlsLink}

提示:如使用 workers.dev 域名,则无法使用 TLS 端口
---------------------------------------------------------------
更多教程,请关注
`;
}

3KWorkers_worker.js
// <!--GAMFC-->version base on commit 43fad05dcdae3b723c53c226f8181fc5bd47223e, time is 2023-06-22 15:20:02 UTC<!--GAMFC-END-->.
// @ts-ignore
import { connect } from 'cloudflare:sockets';

// How to generate your own UUID:
// [Windows] Press "Win + R", input cmd and run:  Powershell -NoExit -Command "[guid]::NewGuid()"
let userID = 'd342d11e-d424-4583-b36e-524ab1f0afa4';

const proxyIPs = ['cdn-all.xn--b6gac.eu.org', 'cdn.xn--b6gac.eu.org', 'cdn-b100.xn--b6gac.eu.org', 'edgetunnel.anycast.eu.org', 'cdn.anycast.eu.org'];

let proxyIP = proxyIPs[Math.floor(Math.random() * proxyIPs.length)];

let dohURL = 'https://sky.rethinkdns.com/1:-Pf_____9_8A_AMAIgE8kMABVDDmKOHTAKg='; // https://cloudflare-dns.com/dns-query or https://dns.google/dns-query

// v2board api environment variables (optional) deprecated, please use planetscale.com instead

if (!isValidUUID(userID)) {
	throw new Error('uuid is invalid');
}

export default {
	/**
	 * @param {import("@cloudflare/workers-types").Request} request
	 * @param {{UUID: string, PROXYIP: string, DNS_RESOLVER_URL: string, NODE_ID: int, API_HOST: string, API_TOKEN: string}} env
	 * @param {import("@cloudflare/workers-types").ExecutionContext} ctx
	 * @returns {Promise<Response>}
	 */
	async fetch(request, env, ctx) {
		// uuid_validator(request);
		try {
			userID = env.UUID || userID;
			proxyIP = env.PROXYIP || proxyIP;
			dohURL = env.DNS_RESOLVER_URL || dohURL;
			let userID_Path = userID;
			if (userID.includes(',')) {
				userID_Path = userID.split(',')[0];
			}
			const upgradeHeader = request.headers.get('Upgrade');
			if (!upgradeHeader || upgradeHeader !== 'websocket') {
				const url = new URL(request.url);
				switch (url.pathname) {
					case '/cf':
						return new Response(JSON.stringify(request.cf, null, 4), {
							status: 200,
							headers: {
								"Content-Type": "application/json;charset=utf-8",
							},
						});
					case `/${userID_Path}`: {
						const vlessConfig = getVLESSConfig(userID, request.headers.get('Host'));
						return new Response(`${vlessConfig}`, {
							status: 200,
							headers: {
								"Content-Type": "text/html; charset=utf-8",
							}
						});
					}
					case `/sub/${userID_Path}`: {
						const url = new URL(request.url);
						const searchParams = url.searchParams;
						let vlessConfig = createVLESSSub(userID, request.headers.get('Host'));
						// If 'format' query param equals to 'clash', convert config to base64
						if (searchParams.get('format') === 'clash') {
							vlessConfig = btoa(vlessConfig);
						}
						// Construct and return response object
						return new Response(vlessConfig, {
							status: 200,
							headers: {
								"Content-Type": "text/plain;charset=utf-8",
							}
						});
					}
					case `/bestip/${userID_Path}`: {
						const bestiplink = `https://sub.xf.free.hr/auto?host=${request.headers.get('Host')}&uuid=${userID_Path}`
						const reqHeaders = new Headers(request.headers);
						const bestipresponse = await fetch(bestiplink, { redirect: 'manual', headers: reqHeaders, });
						// Construct and return response object
						return bestipresponse
					}
					default:
						// return new Response('Not found', { status: 404 });
						// For any other path, reverse proxy to 'www.fmprc.gov.cn' and return the original response, caching it in the process
						const hostnames = ['www.system.cloudns.org'];
						url.hostname = hostnames[Math.floor(Math.random() * hostnames.length)];
						url.protocol = 'https:';

						const newHeaders = new Headers(request.headers);
						newHeaders.set('cf-connecting-ip', newHeaders.get('x-forwarded-for') || newHeaders.get('cf-connecting-ip'));
						newHeaders.set('x-forwarded-for', newHeaders.get('cf-connecting-ip'));
						newHeaders.set('x-real-ip', newHeaders.get('cf-connecting-ip'));
						newHeaders.set('referer', 'https://www.google.com/q=edtunnel');

						request = new Request(url, {
							method: request.method,
							headers: newHeaders,
							body: request.body,
							redirect: request.redirect,
						});

						const cache = caches.default;
						let response = await cache.match(request);

						if (!response) {
							try {
								response = await fetch(request, { redirect: 'manual' });
							} catch (err) {
								url.protocol = 'http:';
								url.hostname = hostnames[Math.floor(Math.random() * hostnames.length)];
								request = new Request(url, {
									method: request.method,
									headers: newHeaders,
									body: request.body,
									redirect: request.redirect,
								});
								response = await fetch(request, { redirect: 'manual' });
							}

							const cloneResponse = response.clone();
							ctx.waitUntil(cache.put(request, cloneResponse));
						}
						return response;
				}
			} else {
				return await vlessOverWSHandler(request);
			}
		} catch (err) {
			/** @type {Error} */ let e = err;
			return new Response(e.toString());
		}
	},
};

export async function uuid_validator(request) {
	const hostname = request.headers.get('Host');
	const currentDate = new Date();

	const subdomain = hostname.split('.')[0];
	const year = currentDate.getFullYear();
	const month = String(currentDate.getMonth() + 1).padStart(2, '0');
	const day = String(currentDate.getDate()).padStart(2, '0');

	const formattedDate = `${year}-${month}-${day}`;

	// const daliy_sub = formattedDate + subdomain
	const hashHex = await hashHex_f(subdomain);
	// subdomain string contains timestamps utc and uuid string TODO.
	console.log(hashHex, subdomain, formattedDate);
}

export async function hashHex_f(string) {
	const encoder = new TextEncoder();
	const data = encoder.encode(string);
	const hashBuffer = await crypto.subtle.digest('SHA-256', data);
	const hashArray = Array.from(new Uint8Array(hashBuffer));
	const hashHex = hashArray.map(byte => byte.toString(16).padStart(2, '0')).join('');
	return hashHex;
}

/**
 * Handles VLESS over WebSocket requests by creating a WebSocket pair, accepting the WebSocket connection, and processing the VLESS header.
 * @param {import("@cloudflare/workers-types").Request} request The incoming request object.
 * @returns {Promise<Response>} A Promise that resolves to a WebSocket response object.
 */
async function vlessOverWSHandler(request) {
	const webSocketPair = new WebSocketPair();
	const [client, webSocket] = Object.values(webSocketPair);
	webSocket.accept();

	let address = '';
	let portWithRandomLog = '';
	let currentDate = new Date();
	const log = (/** @type {string} */ info, /** @type {string | undefined} */ event) => {
		console.log(`[${currentDate} ${address}:${portWithRandomLog}] ${info}`, event || '');
	};
	const earlyDataHeader = request.headers.get('sec-websocket-protocol') || '';

	const readableWebSocketStream = makeReadableWebSocketStream(webSocket, earlyDataHeader, log);

	/** @type {{ value: import("@cloudflare/workers-types").Socket | null}}*/
	let remoteSocketWapper = {
		value: null,
	};
	let udpStreamWrite = null;
	let isDns = false;

	// ws --> remote
	readableWebSocketStream.pipeTo(new WritableStream({
		async write(chunk, controller) {
			if (isDns && udpStreamWrite) {
				return udpStreamWrite(chunk);
			}
			if (remoteSocketWapper.value) {
				const writer = remoteSocketWapper.value.writable.getWriter()
				await writer.write(chunk);
				writer.releaseLock();
				return;
			}

			const {
				hasError,
				message,
				portRemote = 443,
				addressRemote = '',
				rawDataIndex,
				vlessVersion = new Uint8Array([0, 0]),
				isUDP,
			} = processVlessHeader(chunk, userID);
			address = addressRemote;
			portWithRandomLog = `${portRemote} ${isUDP ? 'udp' : 'tcp'} `;
			if (hasError) {
				// controller.error(message);
				throw new Error(message); // cf seems has bug, controller.error will not end stream
				// webSocket.close(1000, message);
				return;
			}

			// If UDP and not DNS port, close it
			if (isUDP && portRemote !== 53) {
				throw new Error('UDP proxy only enabled for DNS which is port 53');
				// cf seems has bug, controller.error will not end stream
			}

			if (isUDP && portRemote === 53) {
				isDns = true;
			}

			// ["version", "附加信息长度 N"]
			const vlessResponseHeader = new Uint8Array([vlessVersion[0], 0]);
			const rawClientData = chunk.slice(rawDataIndex);

			// TODO: support udp here when cf runtime has udp support
			if (isDns) {
				const { write } = await handleUDPOutBound(webSocket, vlessResponseHeader, log);
				udpStreamWrite = write;
				udpStreamWrite(rawClientData);
				return;
			}
			handleTCPOutBound(remoteSocketWapper, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log);
		},
		close() {
			log(`readableWebSocketStream is close`);
		},
		abort(reason) {
			log(`readableWebSocketStream is abort`, JSON.stringify(reason));
		},
	})).catch((err) => {
		log('readableWebSocketStream pipeTo error', err);
	});

	return new Response(null, {
		status: 101,
		webSocket: client,
	});
}

/**
 * Handles outbound TCP connections.
 *
 * @param {any} remoteSocket 
 * @param {string} addressRemote The remote address to connect to.
 * @param {number} portRemote The remote port to connect to.
 * @param {Uint8Array} rawClientData The raw client data to write.
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket The WebSocket to pass the remote socket to.
 * @param {Uint8Array} vlessResponseHeader The VLESS response header.
 * @param {function} log The logging function.
 * @returns {Promise<void>} The remote socket.
 */
async function handleTCPOutBound(remoteSocket, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log,) {

	/**
	 * Connects to a given address and port and writes data to the socket.
	 * @param {string} address The address to connect to.
	 * @param {number} port The port to connect to.
	 * @returns {Promise<import("@cloudflare/workers-types").Socket>} A Promise that resolves to the connected socket.
	 */
	async function connectAndWrite(address, port) {
		/** @type {import("@cloudflare/workers-types").Socket} */
		const tcpSocket = connect({
			hostname: address,
			port: port,
		});
		remoteSocket.value = tcpSocket;
		log(`connected to ${address}:${port}`);
		const writer = tcpSocket.writable.getWriter();
		await writer.write(rawClientData); // first write, nomal is tls client hello
		writer.releaseLock();
		return tcpSocket;
	}

	/**
	 * Retries connecting to the remote address and port if the Cloudflare socket has no incoming data.
	 * @returns {Promise<void>} A Promise that resolves when the retry is complete.
	 */
	async function retry() {
		const tcpSocket = await connectAndWrite(proxyIP || addressRemote, portRemote)
		tcpSocket.closed.catch(error => {
			console.log('retry tcpSocket closed error', error);
		}).finally(() => {
			safeCloseWebSocket(webSocket);
		})
		remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, null, log);
	}

	const tcpSocket = await connectAndWrite(addressRemote, portRemote);

	// when remoteSocket is ready, pass to websocket
	// remote--> ws
	remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, retry, log);
}

/**
 * Creates a readable stream from a WebSocket server, allowing for data to be read from the WebSocket.
 * @param {import("@cloudflare/workers-types").WebSocket} webSocketServer The WebSocket server to create the readable stream from.
 * @param {string} earlyDataHeader The header containing early data for WebSocket 0-RTT.
 * @param {(info: string)=> void} log The logging function.
 * @returns {ReadableStream} A readable stream that can be used to read data from the WebSocket.
 */
function makeReadableWebSocketStream(webSocketServer, earlyDataHeader, log) {
	let readableStreamCancel = false;
	const stream = new ReadableStream({
		start(controller) {
			webSocketServer.addEventListener('message', (event) => {
				const message = event.data;
				controller.enqueue(message);
			});

			webSocketServer.addEventListener('close', () => {
				safeCloseWebSocket(webSocketServer);
				controller.close();
			});

			webSocketServer.addEventListener('error', (err) => {
				log('webSocketServer has error');
				controller.error(err);
			});
			const { earlyData, error } = base64ToArrayBuffer(earlyDataHeader);
			if (error) {
				controller.error(error);
			} else if (earlyData) {
				controller.enqueue(earlyData);
			}
		},

		pull(controller) {
			// if ws can stop read if stream is full, we can implement backpressure
			// https://streams.spec.whatwg.org/#example-rs-push-backpressure
		},

		cancel(reason) {
			log(`ReadableStream was canceled, due to ${reason}`)
			readableStreamCancel = true;
			safeCloseWebSocket(webSocketServer);
		}
	});

	return stream;
}

// https://xtls.github.io/development/protocols/vless.html
// https://github.com/zizifn/excalidraw-backup/blob/main/v2ray-protocol.excalidraw

/**
 * Processes the VLESS header buffer and returns an object with the relevant information.
 * @param {ArrayBuffer} vlessBuffer The VLESS header buffer to process.
 * @param {string} userID The user ID to validate against the UUID in the VLESS header.
 * @returns {{
 *  hasError: boolean,
 *  message?: string,
 *  addressRemote?: string,
 *  addressType?: number,
 *  portRemote?: number,
 *  rawDataIndex?: number,
 *  vlessVersion?: Uint8Array,
 *  isUDP?: boolean
 * }} An object with the relevant information extracted from the VLESS header buffer.
 */
function processVlessHeader(vlessBuffer, userID) {
	if (vlessBuffer.byteLength < 24) {
		return {
			hasError: true,
			message: 'invalid data',
		};
	}

	const version = new Uint8Array(vlessBuffer.slice(0, 1));
	let isValidUser = false;
	let isUDP = false;
	const slicedBuffer = new Uint8Array(vlessBuffer.slice(1, 17));
	const slicedBufferString = stringify(slicedBuffer);
	// check if userID is valid uuid or uuids split by , and contains userID in it otherwise return error message to console
	const uuids = userID.includes(',') ? userID.split(",") : [userID];
	// uuid_validator(hostName, slicedBufferString);


	// isValidUser = uuids.some(userUuid => slicedBufferString === userUuid.trim());
	isValidUser = uuids.some(userUuid => slicedBufferString === userUuid.trim()) || uuids.length === 1 && slicedBufferString === uuids[0].trim();

	console.log(`userID: ${slicedBufferString}`);

	if (!isValidUser) {
		return {
			hasError: true,
			message: 'invalid user',
		};
	}

	const optLength = new Uint8Array(vlessBuffer.slice(17, 18))[0];
	//skip opt for now

	const command = new Uint8Array(
		vlessBuffer.slice(18 + optLength, 18 + optLength + 1)
	)[0];

	// 0x01 TCP
	// 0x02 UDP
	// 0x03 MUX
	if (command === 1) {
		isUDP = false;
	} else if (command === 2) {
		isUDP = true;
	} else {
		return {
			hasError: true,
			message: `command ${command} is not support, command 01-tcp,02-udp,03-mux`,
		};
	}
	const portIndex = 18 + optLength + 1;
	const portBuffer = vlessBuffer.slice(portIndex, portIndex + 2);
	// port is big-Endian in raw data etc 80 == 0x005d
	const portRemote = new DataView(portBuffer).getUint16(0);

	let addressIndex = portIndex + 2;
	const addressBuffer = new Uint8Array(
		vlessBuffer.slice(addressIndex, addressIndex + 1)
	);

	// 1--> ipv4  addressLength =4
	// 2--> domain name addressLength=addressBuffer[1]
	// 3--> ipv6  addressLength =16
	const addressType = addressBuffer[0];
	let addressLength = 0;
	let addressValueIndex = addressIndex + 1;
	let addressValue = '';
	switch (addressType) {
		case 1:
			addressLength = 4;
			addressValue = new Uint8Array(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
			).join('.');
			break;
		case 2:
			addressLength = new Uint8Array(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + 1)
			)[0];
			addressValueIndex += 1;
			addressValue = new TextDecoder().decode(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
			);
			break;
		case 3:
			addressLength = 16;
			const dataView = new DataView(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
			);
			// 2001:0db8:85a3:0000:0000:8a2e:0370:7334
			const ipv6 = [];
			for (let i = 0; i < 8; i++) {
				ipv6.push(dataView.getUint16(i * 2).toString(16));
			}
			addressValue = ipv6.join(':');
			// seems no need add [] for ipv6
			break;
		default:
			return {
				hasError: true,
				message: `invild  addressType is ${addressType}`,
			};
	}
	if (!addressValue) {
		return {
			hasError: true,
			message: `addressValue is empty, addressType is ${addressType}`,
		};
	}

	return {
		hasError: false,
		addressRemote: addressValue,
		addressType,
		portRemote,
		rawDataIndex: addressValueIndex + addressLength,
		vlessVersion: version,
		isUDP,
	};
}


/**
 * Converts a remote socket to a WebSocket connection.
 * @param {import("@cloudflare/workers-types").Socket} remoteSocket The remote socket to convert.
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket The WebSocket to connect to.
 * @param {ArrayBuffer | null} vlessResponseHeader The VLESS response header.
 * @param {(() => Promise<void>) | null} retry The function to retry the connection if it fails.
 * @param {(info: string) => void} log The logging function.
 * @returns {Promise<void>} A Promise that resolves when the conversion is complete.
 */
async function remoteSocketToWS(remoteSocket, webSocket, vlessResponseHeader, retry, log) {
	// remote--> ws
	let remoteChunkCount = 0;
	let chunks = [];
	/** @type {ArrayBuffer | null} */
	let vlessHeader = vlessResponseHeader;
	let hasIncomingData = false; // check if remoteSocket has incoming data
	await remoteSocket.readable
		.pipeTo(
			new WritableStream({
				start() {
				},
				/**
				 * 
				 * @param {Uint8Array} chunk 
				 * @param {*} controller 
				 */
				async write(chunk, controller) {
					hasIncomingData = true;
					remoteChunkCount++;
					if (webSocket.readyState !== WS_READY_STATE_OPEN) {
						controller.error(
							'webSocket.readyState is not open, maybe close'
						);
					}
					if (vlessHeader) {
						webSocket.send(await new Blob([vlessHeader, chunk]).arrayBuffer());
						vlessHeader = null;
					} else {
						// console.log(`remoteSocketToWS send chunk ${chunk.byteLength}`);
						// seems no need rate limit this, CF seems fix this??..
						// if (remoteChunkCount > 20000) {
						// 	// cf one package is 4096 byte(4kb),  4096 * 20000 = 80M
						// 	await delay(1);
						// }
						webSocket.send(chunk);
					}
				},
				close() {
					log(`remoteConnection!.readable is close with hasIncomingData is ${hasIncomingData}`);
					// safeCloseWebSocket(webSocket); // no need server close websocket frist for some case will casue HTTP ERR_CONTENT_LENGTH_MISMATCH issue, client will send close event anyway.
				},
				abort(reason) {
					console.error(`remoteConnection!.readable abort`, reason);
				},
			})
		)
		.catch((error) => {
			console.error(
				`remoteSocketToWS has exception `,
				error.stack || error
			);
			safeCloseWebSocket(webSocket);
		});

	// seems is cf connect socket have error,
	// 1. Socket.closed will have error
	// 2. Socket.readable will be close without any data coming
	if (hasIncomingData === false && retry) {
		log(`retry`)
		retry();
	}
}

/**
 * Decodes a base64 string into an ArrayBuffer.
 * @param {string} base64Str The base64 string to decode.
 * @returns {{earlyData: ArrayBuffer|null, error: Error|null}} An object containing the decoded ArrayBuffer or null if there was an error, and any error that occurred during decoding or null if there was no error.
 */
function base64ToArrayBuffer(base64Str) {
	if (!base64Str) {
		return { earlyData: null, error: null };
	}
	try {
		// go use modified Base64 for URL rfc4648 which js atob not support
		base64Str = base64Str.replace(/-/g, '+').replace(/_/g, '/');
		const decode = atob(base64Str);
		const arryBuffer = Uint8Array.from(decode, (c) => c.charCodeAt(0));
		return { earlyData: arryBuffer.buffer, error: null };
	} catch (error) {
		return { earlyData: null, error };
	}
}

/**
 * Checks if a given string is a valid UUID.
 * Note: This is not a real UUID validation.
 * @param {string} uuid The string to validate as a UUID.
 * @returns {boolean} True if the string is a valid UUID, false otherwise.
 */
function isValidUUID(uuid) {
	const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[4][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
	return uuidRegex.test(uuid);
}

const WS_READY_STATE_OPEN = 1;
const WS_READY_STATE_CLOSING = 2;
/**
 * Closes a WebSocket connection safely without throwing exceptions.
 * @param {import("@cloudflare/workers-types").WebSocket} socket The WebSocket connection to close.
 */
function safeCloseWebSocket(socket) {
	try {
		if (socket.readyState === WS_READY_STATE_OPEN || socket.readyState === WS_READY_STATE_CLOSING) {
			socket.close();
		}
	} catch (error) {
		console.error('safeCloseWebSocket error', error);
	}
}

const byteToHex = [];

for (let i = 0; i < 256; ++i) {
	byteToHex.push((i + 256).toString(16).slice(1));
}

function unsafeStringify(arr, offset = 0) {
	return (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + "-" + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + "-" + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + "-" + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + "-" + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase();
}

function stringify(arr, offset = 0) {
	const uuid = unsafeStringify(arr, offset);
	if (!isValidUUID(uuid)) {
		throw TypeError("Stringified UUID is invalid");
	}
	return uuid;
}


/**
 * Handles outbound UDP traffic by transforming the data into DNS queries and sending them over a WebSocket connection.
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket The WebSocket connection to send the DNS queries over.
 * @param {ArrayBuffer} vlessResponseHeader The VLESS response header.
 * @param {(string) => void} log The logging function.
 * @returns {{write: (chunk: Uint8Array) => void}} An object with a write method that accepts a Uint8Array chunk to write to the transform stream.
 */
async function handleUDPOutBound(webSocket, vlessResponseHeader, log) {

	let isVlessHeaderSent = false;
	const transformStream = new TransformStream({
		start(controller) {

		},
		transform(chunk, controller) {
			// udp message 2 byte is the the length of udp data
			// TODO: this should have bug, beacsue maybe udp chunk can be in two websocket message
			for (let index = 0; index < chunk.byteLength;) {
				const lengthBuffer = chunk.slice(index, index + 2);
				const udpPakcetLength = new DataView(lengthBuffer).getUint16(0);
				const udpData = new Uint8Array(
					chunk.slice(index + 2, index + 2 + udpPakcetLength)
				);
				index = index + 2 + udpPakcetLength;
				controller.enqueue(udpData);
			}
		},
		flush(controller) {
		}
	});

	// only handle dns udp for now
	transformStream.readable.pipeTo(new WritableStream({
		async write(chunk) {
			const resp = await fetch(dohURL, // dns server url
				{
					method: 'POST',
					headers: {
						'content-type': 'application/dns-message',
					},
					body: chunk,
				})
			const dnsQueryResult = await resp.arrayBuffer();
			const udpSize = dnsQueryResult.byteLength;
			// console.log([...new Uint8Array(dnsQueryResult)].map((x) => x.toString(16)));
			const udpSizeBuffer = new Uint8Array([(udpSize >> 8) & 0xff, udpSize & 0xff]);
			if (webSocket.readyState === WS_READY_STATE_OPEN) {
				log(`doh success and dns message length is ${udpSize}`);
				if (isVlessHeaderSent) {
					webSocket.send(await new Blob([udpSizeBuffer, dnsQueryResult]).arrayBuffer());
				} else {
					webSocket.send(await new Blob([vlessResponseHeader, udpSizeBuffer, dnsQueryResult]).arrayBuffer());
					isVlessHeaderSent = true;
				}
			}
		}
	})).catch((error) => {
		log('dns udp has error' + error)
	});

	const writer = transformStream.writable.getWriter();

	return {
		/**
		 * 
		 * @param {Uint8Array} chunk 
		 */
		write(chunk) {
			writer.write(chunk);
		}
	};
}

/**
 *
 * @param {string} userID - single or comma separated userIDs
 * @param {string | null} hostName
 * @returns {string}
 */
function getVLESSConfig(userIDs, hostName) {
	const commonUrlPart = `:443?encryption=none&security=tls&sni=${hostName}&fp=randomized&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}`;
	const separator = "---------------------------------------------------------------";
	const hashSeparator = "################################################################";

	// Split the userIDs into an array
	let userIDArray = userIDs.split(',');

	// Prepare output array
	let output = [];
	let header = [];
	const clash_link = `https://subconverter.do.xn--b6gac.eu.org/sub?target=clash&url=https://${hostName}/sub/${userIDArray[0]}?format=clash&insert=false&emoji=true&list=false&tfo=false&scv=true&fdn=false&sort=false&new_name=true`;
	header.push(`\n<p align="center"><img src="https://cloudflare-ipfs.com/ipfs/bafybeigd6i5aavwpr6wvnwuyayklq3omonggta4x2q7kpmgafj357nkcky" alt="图片描述" style="margin-bottom: -50px;">`);
	header.push(`\n<b style=" font-size: 15px;" >Welcome! This function generates configuration for VLESS protocol. If you found this useful, please check our GitHub project for more:</b>\n`);
	header.push(`<b style=" font-size: 15px;" >欢迎!这是生成 VLESS 协议的配置。如果您发现这个项目很好用,请查看我们的 GitHub 项目给我一个star:</b>\n`);
	header.push(`\n<a href="https://github.com/3Kmfi6HP/EDtunnel" target="_blank">EDtunnel - https://github.com/3Kmfi6HP/EDtunnel</a>\n`);
	header.push(`\n<iframe src="https://ghbtns.com/github-btn.html?user=USERNAME&repo=REPOSITORY&type=star&count=true&size=large" frameborder="0" scrolling="0" width="170" height="30" title="GitHub"></iframe>\n\n`.replace(/USERNAME/g, "3Kmfi6HP").replace(/REPOSITORY/g, "EDtunnel"));
	header.push(`<a href="//${hostName}/sub/${userIDArray[0]}" target="_blank">VLESS 节点订阅连接</a>\n<a href="clash://install-config?url=${encodeURIComponent(clash_link)}" target="_blank">Clash 节点订阅连接</a>\n<a href="${clash_link}" target="_blank">Clash 节点订阅连接2</a></p>\n`);
	header.push(``);

	// Generate output string for each userID
	userIDArray.forEach((userID) => {
		const vlessMain = `vless://${userID}@${hostName}${commonUrlPart}`;
		const vlessSec = `vless://${userID}@${proxyIP}${commonUrlPart}`;
		output.push(`UUID: ${userID}`);
		output.push(`${hashSeparator}\nv2ray default ip\n${separator}\n${vlessMain}\n${separator}`);
		output.push(`${hashSeparator}\nv2ray with best ip\n${separator}\n${vlessSec}\n${separator}`);
	});
	output.push(`${hashSeparator}\n# Clash Proxy Provider 配置格式(configuration format)\nproxy-groups:\n  - name: UseProvider\n	type: select\n	use:\n	  - provider1\n	proxies:\n	  - Proxy\n	  - DIRECT\nproxy-providers:\n  provider1:\n	type: http\n	url: https://${hostName}/sub/${userIDArray[0]}?format=clash\n	interval: 3600\n	path: ./provider1.yaml\n	health-check:\n	  enable: true\n	  interval: 600\n	  # lazy: true\n	  url: http://www.gstatic.com/generate_204\n\n${hashSeparator}`);

	// HTML Head with CSS
	const htmlHead = `
    <head>
        <title>EDtunnel: VLESS configuration</title>
        <meta name="description" content="This is a tool for generating VLESS protocol configurations. Give us a star on GitHub https://github.com/3Kmfi6HP/EDtunnel if you found it useful!">
		<meta name="keywords" content="EDtunnel, cloudflare pages, cloudflare worker, severless">
        <meta name="viewport" content="width=device-width, initial-scale=1">
		<meta property="og:site_name" content="EDtunnel: VLESS configuration" />
        <meta property="og:type" content="website" />
        <meta property="og:title" content="EDtunnel - VLESS configuration and subscribe output" />
        <meta property="og:description" content="Use cloudflare pages and worker severless to implement vless protocol" />
        <meta property="og:url" content="https://${hostName}/" />
        <meta property="og:image" content="https://api.qrserver.com/v1/create-qr-code/?size=500x500&data=${encodeURIComponent(`vless://${userIDs.split(',')[0]}@${hostName}${commonUrlPart}`)}" />
        <meta name="twitter:card" content="summary_large_image" />
        <meta name="twitter:title" content="EDtunnel - VLESS configuration and subscribe output" />
        <meta name="twitter:description" content="Use cloudflare pages and worker severless to implement vless protocol" />
        <meta name="twitter:url" content="https://${hostName}/" />
        <meta name="twitter:image" content="https://cloudflare-ipfs.com/ipfs/bafybeigd6i5aavwpr6wvnwuyayklq3omonggta4x2q7kpmgafj357nkcky" />
        <meta property="og:image:width" content="1500" />
        <meta property="og:image:height" content="1500" />

        <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            color: #333;
            padding: 10px;
        }

        a {
            color: #1a0dab;
            text-decoration: none;
        }
		img {
			max-width: 100%;
			height: auto;
		}
		
        pre {
            white-space: pre-wrap;
            word-wrap: break-word;
            background-color: #fff;
            border: 1px solid #ddd;
            padding: 15px;
            margin: 10px 0;
        }
		/* Dark mode */
        @media (prefers-color-scheme: dark) {
            body {
                background-color: #333;
                color: #f0f0f0;
            }

            a {
                color: #9db4ff;
            }

            pre {
                background-color: #282a36;
                border-color: #6272a4;
            }
        }
        </style>
    </head>
    `;

	// Join output with newlines, wrap inside <html> and <body>
	return `
    <html>
    ${htmlHead}
    <body>
    <pre style="
    background-color: transparent;
    border: none;
">${header.join('')}</pre><pre>${output.join('\n')}</pre>
    </body>
</html>`;
}


function createVLESSSub(userID_Path, hostName) {
	let portArray_http = [80, 8080, 8880, 2052, 2086, 2095, 2082];
	let portArray_https = [443, 8443, 2053, 2096, 2087, 2083];

	// Split the userIDs into an array
	let userIDArray = userID_Path.includes(',') ? userID_Path.split(',') : [userID_Path];

	// Prepare output array
	let output = [];

	// Generate output string for each userID
	userIDArray.forEach((userID) => {
		// Check if the hostName is a Cloudflare Pages domain, if not, generate HTTP configurations
		// reasons: pages.dev not support http only https
		if (!hostName.includes('pages.dev')) {
			// Iterate over all ports for http
			portArray_http.forEach((port) => {
				const commonUrlPart_http = `:${port}?encryption=none&security=none&fp=random&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}-HTTP-${port}`;
				const vlessMainHttp = `vless://${userID}@${hostName}${commonUrlPart_http}`;

				// For each proxy IP, generate a VLESS configuration and add to output
				proxyIPs.forEach((proxyIP) => {
					const vlessSecHttp = `vless://${userID}@${proxyIP}${commonUrlPart_http}-${proxyIP}-EDtunnel`;
					output.push(`${vlessMainHttp}`);
					output.push(`${vlessSecHttp}`);
				});
			});
		}
		// Iterate over all ports for https
		portArray_https.forEach((port) => {
			const commonUrlPart_https = `:${port}?encryption=none&security=tls&sni=${hostName}&fp=random&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}-HTTPS-${port}`;
			const vlessMainHttps = `vless://${userID}@${hostName}${commonUrlPart_https}`;

			// For each proxy IP, generate a VLESS configuration and add to output
			proxyIPs.forEach((proxyIP) => {
				const vlessSecHttps = `vless://${userID}@${proxyIP}${commonUrlPart_https}-${proxyIP}-EDtunnel`;
				output.push(`${vlessMainHttps}`);
				output.push(`${vlessSecHttps}`);
			});
		});
	});

	// Join output with newlines
	return output.join('\n');
}

zizifn_worker.js
// <!--GAMFC-->version base on commit 841ed4e9ff121dde0ed6a56ae800c2e6c4f66056, time is 2024-04-16 18:02:37 UTC<!--GAMFC-END-->.
// @ts-ignore
import { connect } from 'cloudflare:sockets';

// How to generate your own UUID:
// [Windows] Press "Win + R", input cmd and run:  Powershell -NoExit -Command "[guid]::NewGuid()"
let userID = 'd342d11e-d424-4583-b36e-524ab1f0afa4';

let proxyIP = '';


if (!isValidUUID(userID)) {
	throw new Error('uuid is not valid');
}

export default {
	/**
	 * @param {import("@cloudflare/workers-types").Request} request
	 * @param {{UUID: string, PROXYIP: string}} env
	 * @param {import("@cloudflare/workers-types").ExecutionContext} ctx
	 * @returns {Promise<Response>}
	 */
	async fetch(request, env, ctx) {
		try {
			userID = env.UUID || userID;
			proxyIP = env.PROXYIP || proxyIP;
			const upgradeHeader = request.headers.get('Upgrade');
			if (!upgradeHeader || upgradeHeader !== 'websocket') {
				const url = new URL(request.url);
				switch (url.pathname) {
					case '/':
						return new Response(JSON.stringify(request.cf), { status: 200 });
					case `/${userID}`: {
						const vlessConfig = getVLESSConfig(userID, request.headers.get('Host'));
						return new Response(`${vlessConfig}`, {
							status: 200,
							headers: {
								"Content-Type": "text/plain;charset=utf-8",
							}
						});
					}
					default:
						return new Response('Not found', { status: 404 });
				}
			} else {
				return await vlessOverWSHandler(request);
			}
		} catch (err) {
			/** @type {Error} */ let e = err;
			return new Response(e.toString());
		}
	},
};




/**
 * 
 * @param {import("@cloudflare/workers-types").Request} request
 */
async function vlessOverWSHandler(request) {

	/** @type {import("@cloudflare/workers-types").WebSocket[]} */
	// @ts-ignore
	const webSocketPair = new WebSocketPair();
	const [client, webSocket] = Object.values(webSocketPair);

	webSocket.accept();

	let address = '';
	let portWithRandomLog = '';
	const log = (/** @type {string} */ info, /** @type {string | undefined} */ event) => {
		console.log(`[${address}:${portWithRandomLog}] ${info}`, event || '');
	};
	const earlyDataHeader = request.headers.get('sec-websocket-protocol') || '';

	const readableWebSocketStream = makeReadableWebSocketStream(webSocket, earlyDataHeader, log);

	/** @type {{ value: import("@cloudflare/workers-types").Socket | null}}*/
	let remoteSocketWapper = {
		value: null,
	};
	let udpStreamWrite = null;
	let isDns = false;

	// ws --> remote
	readableWebSocketStream.pipeTo(new WritableStream({
		async write(chunk, controller) {
			if (isDns && udpStreamWrite) {
				return udpStreamWrite(chunk);
			}
			if (remoteSocketWapper.value) {
				const writer = remoteSocketWapper.value.writable.getWriter()
				await writer.write(chunk);
				writer.releaseLock();
				return;
			}

			const {
				hasError,
				message,
				portRemote = 443,
				addressRemote = '',
				rawDataIndex,
				vlessVersion = new Uint8Array([0, 0]),
				isUDP,
			} = processVlessHeader(chunk, userID);
			address = addressRemote;
			portWithRandomLog = `${portRemote}--${Math.random()} ${isUDP ? 'udp ' : 'tcp '
				} `;
			if (hasError) {
				// controller.error(message);
				throw new Error(message); // cf seems has bug, controller.error will not end stream
				// webSocket.close(1000, message);
				return;
			}
			// if UDP but port not DNS port, close it
			if (isUDP) {
				if (portRemote === 53) {
					isDns = true;
				} else {
					// controller.error('UDP proxy only enable for DNS which is port 53');
					throw new Error('UDP proxy only enable for DNS which is port 53'); // cf seems has bug, controller.error will not end stream
					return;
				}
			}
			// ["version", "附加信息长度 N"]
			const vlessResponseHeader = new Uint8Array([vlessVersion[0], 0]);
			const rawClientData = chunk.slice(rawDataIndex);

			// TODO: support udp here when cf runtime has udp support
			if (isDns) {
				const { write } = await handleUDPOutBound(webSocket, vlessResponseHeader, log);
				udpStreamWrite = write;
				udpStreamWrite(rawClientData);
				return;
			}
			handleTCPOutBound(remoteSocketWapper, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log);
		},
		close() {
			log(`readableWebSocketStream is close`);
		},
		abort(reason) {
			log(`readableWebSocketStream is abort`, JSON.stringify(reason));
		},
	})).catch((err) => {
		log('readableWebSocketStream pipeTo error', err);
	});

	return new Response(null, {
		status: 101,
		// @ts-ignore
		webSocket: client,
	});
}

/**
 * Handles outbound TCP connections.
 *
 * @param {any} remoteSocket 
 * @param {string} addressRemote The remote address to connect to.
 * @param {number} portRemote The remote port to connect to.
 * @param {Uint8Array} rawClientData The raw client data to write.
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket The WebSocket to pass the remote socket to.
 * @param {Uint8Array} vlessResponseHeader The VLESS response header.
 * @param {function} log The logging function.
 * @returns {Promise<void>} The remote socket.
 */
async function handleTCPOutBound(remoteSocket, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log,) {
	async function connectAndWrite(address, port) {
		/** @type {import("@cloudflare/workers-types").Socket} */
		const tcpSocket = connect({
			hostname: address,
			port: port,
		});
		remoteSocket.value = tcpSocket;
		log(`connected to ${address}:${port}`);
		const writer = tcpSocket.writable.getWriter();
		await writer.write(rawClientData); // first write, nomal is tls client hello
		writer.releaseLock();
		return tcpSocket;
	}

	// if the cf connect tcp socket have no incoming data, we retry to redirect ip
	async function retry() {
		const tcpSocket = await connectAndWrite(proxyIP || addressRemote, portRemote)
		// no matter retry success or not, close websocket
		tcpSocket.closed.catch(error => {
			console.log('retry tcpSocket closed error', error);
		}).finally(() => {
			safeCloseWebSocket(webSocket);
		})
		remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, null, log);
	}

	const tcpSocket = await connectAndWrite(addressRemote, portRemote);

	// when remoteSocket is ready, pass to websocket
	// remote--> ws
	remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, retry, log);
}

/**
 * 
 * @param {import("@cloudflare/workers-types").WebSocket} webSocketServer
 * @param {string} earlyDataHeader for ws 0rtt
 * @param {(info: string)=> void} log for ws 0rtt
 */
function makeReadableWebSocketStream(webSocketServer, earlyDataHeader, log) {
	let readableStreamCancel = false;
	const stream = new ReadableStream({
		start(controller) {
			webSocketServer.addEventListener('message', (event) => {
				if (readableStreamCancel) {
					return;
				}
				const message = event.data;
				controller.enqueue(message);
			});

			// The event means that the client closed the client -> server stream.
			// However, the server -> client stream is still open until you call close() on the server side.
			// The WebSocket protocol says that a separate close message must be sent in each direction to fully close the socket.
			webSocketServer.addEventListener('close', () => {
				// client send close, need close server
				// if stream is cancel, skip controller.close
				safeCloseWebSocket(webSocketServer);
				if (readableStreamCancel) {
					return;
				}
				controller.close();
			}
			);
			webSocketServer.addEventListener('error', (err) => {
				log('webSocketServer has error');
				controller.error(err);
			}
			);
			// for ws 0rtt
			const { earlyData, error } = base64ToArrayBuffer(earlyDataHeader);
			if (error) {
				controller.error(error);
			} else if (earlyData) {
				controller.enqueue(earlyData);
			}
		},

		pull(controller) {
			// if ws can stop read if stream is full, we can implement backpressure
			// https://streams.spec.whatwg.org/#example-rs-push-backpressure
		},
		cancel(reason) {
			// 1. pipe WritableStream has error, this cancel will called, so ws handle server close into here
			// 2. if readableStream is cancel, all controller.close/enqueue need skip,
			// 3. but from testing controller.error still work even if readableStream is cancel
			if (readableStreamCancel) {
				return;
			}
			log(`ReadableStream was canceled, due to ${reason}`)
			readableStreamCancel = true;
			safeCloseWebSocket(webSocketServer);
		}
	});

	return stream;

}

// https://xtls.github.io/development/protocols/vless.html
// https://github.com/zizifn/excalidraw-backup/blob/main/v2ray-protocol.excalidraw

/**
 * 
 * @param { ArrayBuffer} vlessBuffer 
 * @param {string} userID 
 * @returns 
 */
function processVlessHeader(
	vlessBuffer,
	userID
) {
	if (vlessBuffer.byteLength < 24) {
		return {
			hasError: true,
			message: 'invalid data',
		};
	}
	const version = new Uint8Array(vlessBuffer.slice(0, 1));
	let isValidUser = false;
	let isUDP = false;
	if (stringify(new Uint8Array(vlessBuffer.slice(1, 17))) === userID) {
		isValidUser = true;
	}
	if (!isValidUser) {
		return {
			hasError: true,
			message: 'invalid user',
		};
	}

	const optLength = new Uint8Array(vlessBuffer.slice(17, 18))[0];
	//skip opt for now

	const command = new Uint8Array(
		vlessBuffer.slice(18 + optLength, 18 + optLength + 1)
	)[0];

	// 0x01 TCP
	// 0x02 UDP
	// 0x03 MUX
	if (command === 1) {
	} else if (command === 2) {
		isUDP = true;
	} else {
		return {
			hasError: true,
			message: `command ${command} is not support, command 01-tcp,02-udp,03-mux`,
		};
	}
	const portIndex = 18 + optLength + 1;
	const portBuffer = vlessBuffer.slice(portIndex, portIndex + 2);
	// port is big-Endian in raw data etc 80 == 0x005d
	const portRemote = new DataView(portBuffer).getUint16(0);

	let addressIndex = portIndex + 2;
	const addressBuffer = new Uint8Array(
		vlessBuffer.slice(addressIndex, addressIndex + 1)
	);

	// 1--> ipv4  addressLength =4
	// 2--> domain name addressLength=addressBuffer[1]
	// 3--> ipv6  addressLength =16
	const addressType = addressBuffer[0];
	let addressLength = 0;
	let addressValueIndex = addressIndex + 1;
	let addressValue = '';
	switch (addressType) {
		case 1:
			addressLength = 4;
			addressValue = new Uint8Array(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
			).join('.');
			break;
		case 2:
			addressLength = new Uint8Array(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + 1)
			)[0];
			addressValueIndex += 1;
			addressValue = new TextDecoder().decode(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
			);
			break;
		case 3:
			addressLength = 16;
			const dataView = new DataView(
				vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength)
			);
			// 2001:0db8:85a3:0000:0000:8a2e:0370:7334
			const ipv6 = [];
			for (let i = 0; i < 8; i++) {
				ipv6.push(dataView.getUint16(i * 2).toString(16));
			}
			addressValue = ipv6.join(':');
			// seems no need add [] for ipv6
			break;
		default:
			return {
				hasError: true,
				message: `invild  addressType is ${addressType}`,
			};
	}
	if (!addressValue) {
		return {
			hasError: true,
			message: `addressValue is empty, addressType is ${addressType}`,
		};
	}

	return {
		hasError: false,
		addressRemote: addressValue,
		addressType,
		portRemote,
		rawDataIndex: addressValueIndex + addressLength,
		vlessVersion: version,
		isUDP,
	};
}


/**
 * 
 * @param {import("@cloudflare/workers-types").Socket} remoteSocket 
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket 
 * @param {ArrayBuffer} vlessResponseHeader 
 * @param {(() => Promise<void>) | null} retry
 * @param {*} log 
 */
async function remoteSocketToWS(remoteSocket, webSocket, vlessResponseHeader, retry, log) {
	// remote--> ws
	let remoteChunkCount = 0;
	let chunks = [];
	/** @type {ArrayBuffer | null} */
	let vlessHeader = vlessResponseHeader;
	let hasIncomingData = false; // check if remoteSocket has incoming data
	await remoteSocket.readable
		.pipeTo(
			new WritableStream({
				start() {
				},
				/**
				 * 
				 * @param {Uint8Array} chunk 
				 * @param {*} controller 
				 */
				async write(chunk, controller) {
					hasIncomingData = true;
					// remoteChunkCount++;
					if (webSocket.readyState !== WS_READY_STATE_OPEN) {
						controller.error(
							'webSocket.readyState is not open, maybe close'
						);
					}
					if (vlessHeader) {
						webSocket.send(await new Blob([vlessHeader, chunk]).arrayBuffer());
						vlessHeader = null;
					} else {
						// seems no need rate limit this, CF seems fix this??..
						// if (remoteChunkCount > 20000) {
						// 	// cf one package is 4096 byte(4kb),  4096 * 20000 = 80M
						// 	await delay(1);
						// }
						webSocket.send(chunk);
					}
				},
				close() {
					log(`remoteConnection!.readable is close with hasIncomingData is ${hasIncomingData}`);
					// safeCloseWebSocket(webSocket); // no need server close websocket frist for some case will casue HTTP ERR_CONTENT_LENGTH_MISMATCH issue, client will send close event anyway.
				},
				abort(reason) {
					console.error(`remoteConnection!.readable abort`, reason);
				},
			})
		)
		.catch((error) => {
			console.error(
				`remoteSocketToWS has exception `,
				error.stack || error
			);
			safeCloseWebSocket(webSocket);
		});

	// seems is cf connect socket have error,
	// 1. Socket.closed will have error
	// 2. Socket.readable will be close without any data coming
	if (hasIncomingData === false && retry) {
		log(`retry`)
		retry();
	}
}

/**
 * 
 * @param {string} base64Str 
 * @returns 
 */
function base64ToArrayBuffer(base64Str) {
	if (!base64Str) {
		return { error: null };
	}
	try {
		// go use modified Base64 for URL rfc4648 which js atob not support
		base64Str = base64Str.replace(/-/g, '+').replace(/_/g, '/');
		const decode = atob(base64Str);
		const arryBuffer = Uint8Array.from(decode, (c) => c.charCodeAt(0));
		return { earlyData: arryBuffer.buffer, error: null };
	} catch (error) {
		return { error };
	}
}

/**
 * This is not real UUID validation
 * @param {string} uuid 
 */
function isValidUUID(uuid) {
	const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[4][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
	return uuidRegex.test(uuid);
}

const WS_READY_STATE_OPEN = 1;
const WS_READY_STATE_CLOSING = 2;
/**
 * Normally, WebSocket will not has exceptions when close.
 * @param {import("@cloudflare/workers-types").WebSocket} socket
 */
function safeCloseWebSocket(socket) {
	try {
		if (socket.readyState === WS_READY_STATE_OPEN || socket.readyState === WS_READY_STATE_CLOSING) {
			socket.close();
		}
	} catch (error) {
		console.error('safeCloseWebSocket error', error);
	}
}

const byteToHex = [];
for (let i = 0; i < 256; ++i) {
	byteToHex.push((i + 256).toString(16).slice(1));
}
function unsafeStringify(arr, offset = 0) {
	return (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + "-" + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + "-" + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + "-" + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + "-" + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase();
}
function stringify(arr, offset = 0) {
	const uuid = unsafeStringify(arr, offset);
	if (!isValidUUID(uuid)) {
		throw TypeError("Stringified UUID is invalid");
	}
	return uuid;
}


/**
 * 
 * @param {import("@cloudflare/workers-types").WebSocket} webSocket 
 * @param {ArrayBuffer} vlessResponseHeader 
 * @param {(string)=> void} log 
 */
async function handleUDPOutBound(webSocket, vlessResponseHeader, log) {

	let isVlessHeaderSent = false;
	const transformStream = new TransformStream({
		start(controller) {

		},
		transform(chunk, controller) {
			// udp message 2 byte is the the length of udp data
			// TODO: this should have bug, beacsue maybe udp chunk can be in two websocket message
			for (let index = 0; index < chunk.byteLength;) {
				const lengthBuffer = chunk.slice(index, index + 2);
				const udpPakcetLength = new DataView(lengthBuffer).getUint16(0);
				const udpData = new Uint8Array(
					chunk.slice(index + 2, index + 2 + udpPakcetLength)
				);
				index = index + 2 + udpPakcetLength;
				controller.enqueue(udpData);
			}
		},
		flush(controller) {
		}
	});

	// only handle dns udp for now
	transformStream.readable.pipeTo(new WritableStream({
		async write(chunk) {
			const resp = await fetch('https://1.1.1.1/dns-query',
				{
					method: 'POST',
					headers: {
						'content-type': 'application/dns-message',
					},
					body: chunk,
				})
			const dnsQueryResult = await resp.arrayBuffer();
			const udpSize = dnsQueryResult.byteLength;
			// console.log([...new Uint8Array(dnsQueryResult)].map((x) => x.toString(16)));
			const udpSizeBuffer = new Uint8Array([(udpSize >> 8) & 0xff, udpSize & 0xff]);
			if (webSocket.readyState === WS_READY_STATE_OPEN) {
				log(`doh success and dns message length is ${udpSize}`);
				if (isVlessHeaderSent) {
					webSocket.send(await new Blob([udpSizeBuffer, dnsQueryResult]).arrayBuffer());
				} else {
					webSocket.send(await new Blob([vlessResponseHeader, udpSizeBuffer, dnsQueryResult]).arrayBuffer());
					isVlessHeaderSent = true;
				}
			}
		}
	})).catch((error) => {
		log('dns udp has error' + error)
	});

	const writer = transformStream.writable.getWriter();

	return {
		/**
		 * 
		 * @param {Uint8Array} chunk 
		 */
		write(chunk) {
			writer.write(chunk);
		}
	};
}

/**
 * 
 * @param {string} userID 
 * @param {string | null} hostName
 * @returns {string}
 */
function getVLESSConfig(userID, hostName) {
	const vlessMain = `vless://${userID}\u0040${hostName}:443?encryption=none&security=tls&sni=${hostName}&fp=randomized&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}`
	return `
################################################################
v2ray
---------------------------------------------------------------
${vlessMain}
---------------------------------------------------------------
################################################################
clash-meta
---------------------------------------------------------------
- type: vless
  name: ${hostName}
  server: ${hostName}
  port: 443
  uuid: ${userID}
  network: ws
  tls: true
  udp: false
  sni: ${hostName}
  client-fingerprint: chrome
  ws-opts:
    path: "/?ed=2048"
    headers:
      host: ${hostName}
---------------------------------------------------------------
################################################################
`;
}

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