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Edit File: binary.js

import { isBinary } from "./is-binary.js";
/**
 * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
 *
 * @param {Object} packet - socket.io event packet
 * @return {Object} with deconstructed packet and list of buffers
 * @public
 */
export function deconstructPacket(packet) {
    const buffers = [];
    const packetData = packet.data;
    const pack = packet;
    pack.data = _deconstructPacket(packetData, buffers);
    pack.attachments = buffers.length; // number of binary 'attachments'
    return { packet: pack, buffers: buffers };
}
function _deconstructPacket(data, buffers) {
    if (!data)
        return data;
    if (isBinary(data)) {
        const placeholder = { _placeholder: true, num: buffers.length };
        buffers.push(data);
        return placeholder;
    }
    else if (Array.isArray(data)) {
        const newData = new Array(data.length);
        for (let i = 0; i < data.length; i++) {
            newData[i] = _deconstructPacket(data[i], buffers);
        }
        return newData;
    }
    else if (typeof data === "object" && !(data instanceof Date)) {
        const newData = {};
        for (const key in data) {
            if (Object.prototype.hasOwnProperty.call(data, key)) {
                newData[key] = _deconstructPacket(data[key], buffers);
            }
        }
        return newData;
    }
    return data;
}
/**
 * Reconstructs a binary packet from its placeholder packet and buffers
 *
 * @param {Object} packet - event packet with placeholders
 * @param {Array} buffers - binary buffers to put in placeholder positions
 * @return {Object} reconstructed packet
 * @public
 */
export function reconstructPacket(packet, buffers) {
    packet.data = _reconstructPacket(packet.data, buffers);
    delete packet.attachments; // no longer useful
    return packet;
}
function _reconstructPacket(data, buffers) {
    if (!data)
        return data;
    if (data && data._placeholder === true) {
        const isIndexValid = typeof data.num === "number" &&
            data.num >= 0 &&
            data.num < buffers.length;
        if (isIndexValid) {
            return buffers[data.num]; // appropriate buffer (should be natural order anyway)
        }
        else {
            throw new Error("illegal attachments");
        }
    }
    else if (Array.isArray(data)) {
        for (let i = 0; i < data.length; i++) {
            data[i] = _reconstructPacket(data[i], buffers);
        }
    }
    else if (typeof data === "object") {
        for (const key in data) {
            if (Object.prototype.hasOwnProperty.call(data, key)) {
                data[key] = _reconstructPacket(data[key], buffers);
            }
        }
    }
    return data;
}

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