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Current File : /var/app/comcon24/cms/node_modules/socket.io-parser/build/esm/index.js

import { Emitter } from "@socket.io/component-emitter";
import { deconstructPacket, reconstructPacket } from "./binary.js";
import { isBinary, hasBinary } from "./is-binary.js";
/**
 * These strings must not be used as event names, as they have a special meaning.
 */
const RESERVED_EVENTS = [
    "connect",
    "connect_error",
    "disconnect",
    "disconnecting",
    "newListener",
    "removeListener", // used by the Node.js EventEmitter
];
/**
 * Protocol version.
 *
 * @public
 */
export const protocol = 5;
export var PacketType;
(function (PacketType) {
    PacketType[PacketType["CONNECT"] = 0] = "CONNECT";
    PacketType[PacketType["DISCONNECT"] = 1] = "DISCONNECT";
    PacketType[PacketType["EVENT"] = 2] = "EVENT";
    PacketType[PacketType["ACK"] = 3] = "ACK";
    PacketType[PacketType["CONNECT_ERROR"] = 4] = "CONNECT_ERROR";
    PacketType[PacketType["BINARY_EVENT"] = 5] = "BINARY_EVENT";
    PacketType[PacketType["BINARY_ACK"] = 6] = "BINARY_ACK";
})(PacketType || (PacketType = {}));
/**
 * A socket.io Encoder instance
 */
export class Encoder {
    /**
     * Encoder constructor
     *
     * @param {function} replacer - custom replacer to pass down to JSON.parse
     */
    constructor(replacer) {
        this.replacer = replacer;
    }
    /**
     * Encode a packet as a single string if non-binary, or as a
     * buffer sequence, depending on packet type.
     *
     * @param {Object} obj - packet object
     */
    encode(obj) {
        if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {
            if (hasBinary(obj)) {
                return this.encodeAsBinary({
                    type: obj.type === PacketType.EVENT
                        ? PacketType.BINARY_EVENT
                        : PacketType.BINARY_ACK,
                    nsp: obj.nsp,
                    data: obj.data,
                    id: obj.id,
                });
            }
        }
        return [this.encodeAsString(obj)];
    }
    /**
     * Encode packet as string.
     */
    encodeAsString(obj) {
        // first is type
        let str = "" + obj.type;
        // attachments if we have them
        if (obj.type === PacketType.BINARY_EVENT ||
            obj.type === PacketType.BINARY_ACK) {
            str += obj.attachments + "-";
        }
        // if we have a namespace other than `/`
        // we append it followed by a comma `,`
        if (obj.nsp && "/" !== obj.nsp) {
            str += obj.nsp + ",";
        }
        // immediately followed by the id
        if (null != obj.id) {
            str += obj.id;
        }
        // json data
        if (null != obj.data) {
            str += JSON.stringify(obj.data, this.replacer);
        }
        return str;
    }
    /**
     * Encode packet as 'buffer sequence' by removing blobs, and
     * deconstructing packet into object with placeholders and
     * a list of buffers.
     */
    encodeAsBinary(obj) {
        const deconstruction = deconstructPacket(obj);
        const pack = this.encodeAsString(deconstruction.packet);
        const buffers = deconstruction.buffers;
        buffers.unshift(pack); // add packet info to beginning of data list
        return buffers; // write all the buffers
    }
}
// see https://stackoverflow.com/questions/8511281/check-if-a-value-is-an-object-in-javascript
function isObject(value) {
    return Object.prototype.toString.call(value) === "[object Object]";
}
/**
 * A socket.io Decoder instance
 *
 * @return {Object} decoder
 */
export class Decoder extends Emitter {
    /**
     * Decoder constructor
     *
     * @param {function} reviver - custom reviver to pass down to JSON.stringify
     */
    constructor(reviver) {
        super();
        this.reviver = reviver;
    }
    /**
     * Decodes an encoded packet string into packet JSON.
     *
     * @param {String} obj - encoded packet
     */
    add(obj) {
        let packet;
        if (typeof obj === "string") {
            if (this.reconstructor) {
                throw new Error("got plaintext data when reconstructing a packet");
            }
            packet = this.decodeString(obj);
            const isBinaryEvent = packet.type === PacketType.BINARY_EVENT;
            if (isBinaryEvent || packet.type === PacketType.BINARY_ACK) {
                packet.type = isBinaryEvent ? PacketType.EVENT : PacketType.ACK;
                // binary packet's json
                this.reconstructor = new BinaryReconstructor(packet);
                // no attachments, labeled binary but no binary data to follow
                if (packet.attachments === 0) {
                    super.emitReserved("decoded", packet);
                }
            }
            else {
                // non-binary full packet
                super.emitReserved("decoded", packet);
            }
        }
        else if (isBinary(obj) || obj.base64) {
            // raw binary data
            if (!this.reconstructor) {
                throw new Error("got binary data when not reconstructing a packet");
            }
            else {
                packet = this.reconstructor.takeBinaryData(obj);
                if (packet) {
                    // received final buffer
                    this.reconstructor = null;
                    super.emitReserved("decoded", packet);
                }
            }
        }
        else {
            throw new Error("Unknown type: " + obj);
        }
    }
    /**
     * Decode a packet String (JSON data)
     *
     * @param {String} str
     * @return {Object} packet
     */
    decodeString(str) {
        let i = 0;
        // look up type
        const p = {
            type: Number(str.charAt(0)),
        };
        if (PacketType[p.type] === undefined) {
            throw new Error("unknown packet type " + p.type);
        }
        // look up attachments if type binary
        if (p.type === PacketType.BINARY_EVENT ||
            p.type === PacketType.BINARY_ACK) {
            const start = i + 1;
            while (str.charAt(++i) !== "-" && i != str.length) { }
            const buf = str.substring(start, i);
            if (buf != Number(buf) || str.charAt(i) !== "-") {
                throw new Error("Illegal attachments");
            }
            p.attachments = Number(buf);
        }
        // look up namespace (if any)
        if ("/" === str.charAt(i + 1)) {
            const start = i + 1;
            while (++i) {
                const c = str.charAt(i);
                if ("," === c)
                    break;
                if (i === str.length)
                    break;
            }
            p.nsp = str.substring(start, i);
        }
        else {
            p.nsp = "/";
        }
        // look up id
        const next = str.charAt(i + 1);
        if ("" !== next && Number(next) == next) {
            const start = i + 1;
            while (++i) {
                const c = str.charAt(i);
                if (null == c || Number(c) != c) {
                    --i;
                    break;
                }
                if (i === str.length)
                    break;
            }
            p.id = Number(str.substring(start, i + 1));
        }
        // look up json data
        if (str.charAt(++i)) {
            const payload = this.tryParse(str.substr(i));
            if (Decoder.isPayloadValid(p.type, payload)) {
                p.data = payload;
            }
            else {
                throw new Error("invalid payload");
            }
        }
        return p;
    }
    tryParse(str) {
        try {
            return JSON.parse(str, this.reviver);
        }
        catch (e) {
            return false;
        }
    }
    static isPayloadValid(type, payload) {
        switch (type) {
            case PacketType.CONNECT:
                return isObject(payload);
            case PacketType.DISCONNECT:
                return payload === undefined;
            case PacketType.CONNECT_ERROR:
                return typeof payload === "string" || isObject(payload);
            case PacketType.EVENT:
            case PacketType.BINARY_EVENT:
                return (Array.isArray(payload) &&
                    (typeof payload[0] === "number" ||
                        (typeof payload[0] === "string" &&
                            RESERVED_EVENTS.indexOf(payload[0]) === -1)));
            case PacketType.ACK:
            case PacketType.BINARY_ACK:
                return Array.isArray(payload);
        }
    }
    /**
     * Deallocates a parser's resources
     */
    destroy() {
        if (this.reconstructor) {
            this.reconstructor.finishedReconstruction();
            this.reconstructor = null;
        }
    }
}
/**
 * A manager of a binary event's 'buffer sequence'. Should
 * be constructed whenever a packet of type BINARY_EVENT is
 * decoded.
 *
 * @param {Object} packet
 * @return {BinaryReconstructor} initialized reconstructor
 */
class BinaryReconstructor {
    constructor(packet) {
        this.packet = packet;
        this.buffers = [];
        this.reconPack = packet;
    }
    /**
     * Method to be called when binary data received from connection
     * after a BINARY_EVENT packet.
     *
     * @param {Buffer | ArrayBuffer} binData - the raw binary data received
     * @return {null | Object} returns null if more binary data is expected or
     *   a reconstructed packet object if all buffers have been received.
     */
    takeBinaryData(binData) {
        this.buffers.push(binData);
        if (this.buffers.length === this.reconPack.attachments) {
            // done with buffer list
            const packet = reconstructPacket(this.reconPack, this.buffers);
            this.finishedReconstruction();
            return packet;
        }
        return null;
    }
    /**
     * Cleans up binary packet reconstruction variables.
     */
    finishedReconstruction() {
        this.reconPack = null;
        this.buffers = [];
    }
}

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