rentgen/util.ts

import { EventEmitter } from "events";
import { Dispatch, SetStateAction, useEffect, useState } from "react";

export type Unpromisify<T> = T extends Promise<infer R> ? R : T;
export type Unarray<T> = T extends Array<infer R> ? R : T;

export type Tab = Unarray<Unpromisify<ReturnType<typeof browser.tabs.query>>>;
export type Request = {
  cookieStoreId?: string;
  documentUrl?: string; // RL of the document in which the resource will be loaded. For example, if the web page at "https://example.com" contains an image or an iframe, then the documentUrl for the image or iframe will be "https://example.com". For a top-level document, documentUrl is undefined.
  frameId: number;
  incognito?: boolean;
  method: string;
  originUrl: string;
  parentFrameId: number;
  proxyInfo?: {
    host: string;
    port: number;
    type: string;
    username: string;
    proxyDNS: boolean;
    failoverTimeout: number;
  };
  requestHeaders?: { name: string; value?: string; binaryValue?: number[] }[];
  requestId: string;
  tabId: number;
  thirdParty?: boolean;
  timeStamp: number;
  type: string;
  url: string; // the target of the request;
  urlClassification?: { firstParty: string[]; thirdParty: string[] };
};

export function getshorthost(host: string) {
  const parts = host
    .replace(/^.*:\/\//, "")
    .replace(/\/.*$/, "")
    .split(".");
  let lookback = parts.at(-2).length > 3 ? -2 : -3;
  if (parts.at(-2) == "doubleclick") {
    lookback = -4; // to distinguish between google ads and stats
  }
  return parts.slice(lookback).join(".");
}

export function useEmitter(
  e: EventEmitter
): [number, Dispatch<SetStateAction<number>>] {
  const [counter, setCounter] = useState<number>(0);
  useEffect(() => {
    const callback = () => {
      setCounter((counter) => counter + 1);
    };
    e.on("change", callback);
    return () => {
      e.removeListener("change", callback);
    };
  }, []);
  return [counter, setCounter];
}

export function parseCookie(cookie: string): Record<string, string> {
  return cookie
    .split(";")
    .map((l) => l.split("="))
    .reduce(
      (acc, [key, value]) => ({
        ...acc,
        [key]: value,
      }),
      {}
    );
}

export async function getTabByID(id: number) {
  const tabs = await browser.tabs.query({ currentWindow: true });
  return tabs.find((tab) => tab.id == id);
}

export function parseToObject(str: unknown): Record<string | symbol, unknown> {
  let result: Record<string | symbol, unknown>;
  let original_string: string;
  if (typeof str === "string") {
    original_string = str;
    result = JSON.parse(str);
  } else if (typeof str == "object") {
    result = str as Record<string | symbol, unknown>;
    original_string =
      (result[Symbol.for("originalString")] as string) || JSON.stringify(str);
  }
  result[Symbol.for("originalString")] = original_string;
  return result;
}

export function isJSONObject(
  str: unknown
): str is Record<string, unknown> | string | number {
  try {
    return JSON.stringify(parseToObject(str))[0] == "{";
  } catch (e) {
    return false;
  }
}

export function isURL(str: unknown): str is string {
  try {
    return !!(typeof str === "string" && new URL(str));
  } catch (e) {
    return false;
  }
}

export function hyphenate(str: string): string {
  return str.replace(/[_\[A-Z]/g, `${String.fromCharCode(173)}$&`);
}

export function unique<T>(array: T[]): Array<T> {
  return Array.from(new Set<T>(array));
}

export function allSubhosts(host: string) {
  const parts = host.split(".");
  const result = [];
  for (let i = 0; i < parts.length - 2; i++) {
    result.push(parts.slice(i).join("."));
  }
  return result;
}

export function reduceConcat<T>(a: T[], b: T[]): T[] {
  return a.concat(b);
}

export function getDate() {
  const d = new Date();
  return `${d.getFullYear()}-${(d.getMonth() + 1)
    .toString()
    .padStart(2, "0")}-${d.getDate().toString().padStart(2, "0")}`;
}

export function toBase64(file: File): Promise<string> {
  return new Promise((resolve) => {
    const FR = new FileReader();
    FR.addEventListener("load", (e) => {
      resolve(e.target.result as string);
    });
    FR.readAsDataURL(file);
  });
}

export function makeThrottle(interval: number) {
  let last_emit = 0;
  function emit(callback: () => void) {
    if (Date.now() - last_emit > interval) {
      callback();
      last_emit = Date.now();
      return true;
    } else {
      return false;
    }
  }
  return function (callback: () => void) {
    if (!emit(callback)) {
      setTimeout(() => emit(callback), interval);
    }
  };
}

export function isSameURL(url1: string, url2: string): boolean {
  if (url1 === url2) {
    return true;
  }
  url1 = url1.replace(/^https?:\/\//, "").replace(/\/$/, "");
  url2 = url2.replace(/^https?:\/\//, "").replace(/\/$/, "");
  return url1 === url2;
}

export function isBase64(s: string): boolean {
  try {
    atob(s);
    return true;
  } catch (e) {}
  return false;
}

export function isBase64JSON(s: unknown): s is string {
  return typeof s === "string" && isBase64(s) && isJSONObject(atob(s));
}

export function flattenObject(
  obj: Record<string, unknown>
): [string, string][] {
  const ret: [string, string][] = [];
  for (const [key, value] of Object.entries(obj)) {
    const value = obj[key];
    if (value === null) {
      ret.push([key, "null"]);
      continue;
    }
    if (typeof value === "object") {
      const flattened = flattenObject(value as Record<string, unknown>);
      for (const [subkey, subvalue] of flattened) {
        ret.push([`${key}.${subkey}`, subvalue]);
      }
    } else {
      ret.push([key, value.toString()]);
    }
  }
  return ret;
}

export function flattenObjectEntries(
  entries: [string, unknown][]
): [string, string][] {
  return flattenObject(Object.fromEntries(entries));
}

export function maskString(
  str: string,
  max_fraction_remaining: number,
  max_chars_total: number
): string {
  const amount_of_chars_to_cut =
    str.length - Math.min(str.length * max_fraction_remaining, max_chars_total);
  if (amount_of_chars_to_cut == 0) {
    return str;
  }
  return (
    str.slice(0, str.length / 2 - amount_of_chars_to_cut / 2) +
    "(...)" +
    str.slice(str.length / 2 + amount_of_chars_to_cut / 2)
  );
}