server/project/src/utils/ObjectId.ts

import crypto from "node:crypto";
import { inject, injectable } from "tsyringe";

import { TimeUtil } from "@spt-aki/utils/TimeUtil";

@injectable()
export class ObjectId
{
    constructor(@inject("TimeUtil") protected timeUtil: TimeUtil)
    {}

    protected randomBytes = crypto.randomBytes(5);
    protected constglobalCounter = 0;
    protected consttime = 0;
    protected globalCounter: number;
    protected time: number;

    public incGlobalCounter(): number
    {
        return (this.globalCounter = (this.globalCounter + 1) % 0xffffff);
    }

    public toHexString(byteArray: string | any[] | Buffer): string
    {
        let hexString = "";
        for (let i = 0; i < byteArray.length; i++)
        {
            hexString += (`0${(byteArray[i] & 0xFF).toString(16)}`).slice(-2);
        }
        return hexString;
    }

    public generate(): string
    {
        const time = this.timeUtil.getTimestamp();
        if (this.time !== time)
        {
            this.globalCounter = 0;
            this.time = time;
        }
        const counter = this.incGlobalCounter();
        const objectIdBinary = Buffer.alloc(12);

        objectIdBinary[3] = time & 0xff;
        objectIdBinary[2] = (time >> 8) & 0xff;
        objectIdBinary[1] = (time >> 16) & 0xff;
        objectIdBinary[0] = (time >> 24) & 0xff;
        objectIdBinary[4] = this.randomBytes[0];
        objectIdBinary[5] = this.randomBytes[1];
        objectIdBinary[6] = this.randomBytes[2];
        objectIdBinary[7] = this.randomBytes[3];
        objectIdBinary[8] = this.randomBytes[4];
        objectIdBinary[9] = (counter >> 16) & 0xff;
        objectIdBinary[10] = (counter >> 8) & 0xff;
        objectIdBinary[11] = counter & 0xff;

        return this.toHexString(objectIdBinary);
    }
}