tweb/src/lib/polyfill.ts

import { bytesToHex, bytesFromHex, bufferConcats } from "./bin_utils";
// @ts-ignore
import {SecureRandom} from 'jsbn';

export const secureRandom = new SecureRandom();

Object.defineProperty(Uint8Array.prototype, 'hex', {
  get: function(): string {
    return bytesToHex([...this]);
  },
  
  set: function(str: string) {
    this.set(bytesFromHex(str));
  },
  enumerable: true,
  configurable: true
});

Uint8Array.prototype.randomize = function() {
  secureRandom.nextBytes(this);
  return this;
};

Uint8Array.prototype.concat = function(...args: Array<Uint8Array | ArrayBuffer | number[]>) {
  return bufferConcats(this, ...args);
};

Uint8Array.prototype.toString = function() {
  return String.fromCharCode.apply(null, [...this]);
};

Uint8Array.prototype.toJSON = function() {
  return [...this];
};

Array.prototype.forEachReverse = function<T>(callback: (value: T, index?: number, array?: Array<T>) => void) {
  let length = this.length;
  for(var i = length - 1; i >= 0; --i) {
    callback(this[i], i, this);
  }
};

Array.prototype.findAndSplice = function<T>(verify: (value: T, index?: number, array?: Array<T>) => boolean) {
  let index = this.findIndex(verify);
  return index !== -1 ? this.splice(index, 1)[0] : undefined;
};

String.prototype.toHHMMSS = function(leadZero = false) {
  const sec_num = parseInt(this + '', 10);
  const hours = Math.floor(sec_num / 3600);
  let minutes: any = Math.floor((sec_num - (hours * 3600)) / 60);
  let seconds: any = sec_num - (hours * 3600) - (minutes * 60);
  
  if(hours) leadZero = true;
  if(minutes < 10) minutes = leadZero ? "0" + minutes : minutes;
  if(seconds < 10) seconds = "0" + seconds;
  return (hours ? /* ('0' + hours).slice(-2) */hours + ':' : '') + minutes + ':' + seconds;
};

declare global {
  interface Uint8Array {
    hex: string;
    randomize: () => Uint8Array,
    concat: (...args: Array<Uint8Array | ArrayBuffer | number[]>) => Uint8Array,
    toString: () => string,
    toJSON: () => number[],
  }
  
  interface Array<T> {
    forEachReverse(callback: (value: T, index?: number, array?: Array<T>) => void): void;
    findAndSplice(verify: (value: T, index?: number, array?: Array<T>) => boolean): T;
  }
  
  interface String {
    toHHMMSS(leadZero?: boolean): string;
  }
}