Function processVlessHeader

js/worker.js:279–389

* * @param { ArrayBuffer} vlessBuffer * @param {string} userID * @returns

(
    vlessBuffer,
    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;