fill.ts

1import { isVisible } from "./detect";2import { extractDomain } from "../shared/domain";34function getRegistrableDomain(hostname: string): string {5  return extractDomain(hostname) ?? hostname;6}78function checkFormAction(form: HTMLFormElement | null, expectedDomain: string): boolean {9  if (!form?.action) return true;10  try {11    const actionUrl = new URL(form.action);12    const actionDomain = getRegistrableDomain(actionUrl.hostname);13    if (actionDomain !== expectedDomain) {14      return false;15    }16  } catch {}17  return true;18}1920export function fillFields(21  usernameEl: HTMLInputElement | null,22  passwordEl: HTMLInputElement | null,23  username: string,24  password: string,25  form?: HTMLFormElement | null,26  expectedDomain?: string27): void {28  if (expectedDomain && form && !checkFormAction(form, expectedDomain)) {29    return;30  }31  // Fill username regardless of visibility — on SPA step-by-step login flows32  // the username input may be visually hidden but still tracked by the form.33  if (usernameEl && username) {34    setNativeValue(usernameEl, username);35  }36  if (passwordEl && isVisible(passwordEl)) {37    setNativeValue(passwordEl, password);38  }39}4041function setNativeValue(el: HTMLInputElement, value: string): void {42  const nativeInputValueSetter = Object.getOwnPropertyDescriptor(43    window.HTMLInputElement.prototype,44    "value"45  )?.set;46  nativeInputValueSetter?.call(el, value);47  el.dispatchEvent(new Event("input", { bubbles: true }));48  el.dispatchEvent(new Event("change", { bubbles: true }));49}5051export interface CardFillFields {52  number: HTMLInputElement | null;53  expMonth: HTMLInputElement | null;54  expYear: HTMLInputElement | null;55  expiryCombo: HTMLInputElement | null;56  cvc: HTMLInputElement | null;57  name: HTMLInputElement | null;58}5960export function fillCardForm(fields: CardFillFields, card: { cardNumber: string; expMonth: string; expYear: string; cvc: string; cardholderName: string }): void {61  const raw = card.cardNumber.replace(/\s/g, '');62  if (fields.number) setNativeValue(fields.number, formatCardNumber(raw));63  if (fields.expiryCombo) {64    setNativeValue(fields.expiryCombo, `${card.expMonth}/${card.expYear.slice(-2)}`);65  } else {66    if (fields.expMonth) setNativeValue(fields.expMonth, card.expMonth);67    if (fields.expYear) setNativeValue(fields.expYear, card.expYear);68  }69  if (fields.cvc) setNativeValue(fields.cvc, card.cvc);70  if (fields.name) setNativeValue(fields.name, card.cardholderName);71}7273export function formatCardNumber(raw: string): string {74  if (/^3[47]/.test(raw)) return raw.replace(/(\d{4})(\d{6})(\d{5})/, '$1 $2 $3');75  return raw.replace(/(\d{4})(?=\d)/g, '$1 ').trim();76}7778export function detectCardNetwork(number: string): import('../shared/types').CardNetwork {79  const n = number.replace(/\s/g, '');80  if (/^4/.test(n)) return 'visa';81  if (/^5[1-5]|^2[2-7]/.test(n)) return 'mastercard';82  if (/^3[47]/.test(n)) return 'amex';83  if (/^6(?:011|5)/.test(n)) return 'discover';84  return 'unknown';85}8687export function passesLuhn(number: string): boolean {88  const digits = number.replace(/\s/g, '').split('').map(Number);89  let sum = 0, isEven = false;90  for (let i = digits.length - 1; i >= 0; i--) {91    let d = digits[i]!;92    if (isEven) { d *= 2; if (d > 9) d -= 9; }93    sum += d;94    isEven = !isEven;95  }96  return sum % 10 === 0;97}9899export function extractLast4(number: string): string {100  return number.replace(/\s/g, '').slice(-4);101}