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}4041// Distributes a TOTP code character-by-character into an ordered array of42// single-character input boxes (the individual digit entry pattern used by43// some 2FA flows). Triggers native input+change events on each box so44// React/Vue controlled inputs update correctly.45export function fillOTPDigitBoxes(boxes: HTMLInputElement[], code: string): void {46  const digits = code.replace(/\s/g, "").split("");47  boxes.forEach((box, i) => {48    if (i < digits.length) setNativeValue(box, digits[i]!);49  });50}5152export function fillTOTPCode(53  totpEl: HTMLInputElement | null,54  code: string55): boolean {56  if (!totpEl || !code || !isVisible(totpEl)) return false;57  if (totpEl.value.trim() !== "") return false;58  setNativeValue(totpEl, code);59  return true;60}6162// React tracks input values via a synthetic event system that does not see63// direct `.value =` assignment. We must call the native HTMLInputElement64// value setter (pulled off the prototype) and then dispatch the real input65// and change events so React re-reads the new value. Without this, the66// field reads as empty to the form's controlled-input state.67export function setNativeValue(68  el: HTMLInputElement | HTMLTextAreaElement,69  value: string70): void {71  const proto =72    el instanceof HTMLTextAreaElement73      ? window.HTMLTextAreaElement.prototype74      : window.HTMLInputElement.prototype;75  const nativeValueSetter = Object.getOwnPropertyDescriptor(proto, "value")?.set;76  nativeValueSetter?.call(el, value);77  el.dispatchEvent(new Event("input", { bubbles: true }));78  el.dispatchEvent(new Event("change", { bubbles: true }));79}8081export interface CardFillFields {82  number: HTMLInputElement | null;83  expMonth: HTMLInputElement | null;84  expYear: HTMLInputElement | null;85  expiryCombo: HTMLInputElement | null;86  cvc: HTMLInputElement | null;87  name: HTMLInputElement | null;88}8990export function fillCardForm(fields: CardFillFields, card: { cardNumber: string; expMonth: string; expYear: string; cvc: string; cardholderName: string }): void {91  const raw = card.cardNumber.replace(/\s/g, '');92  if (fields.number) setNativeValue(fields.number, formatCardNumber(raw));93  if (fields.expiryCombo) {94    setNativeValue(fields.expiryCombo, `${card.expMonth}/${card.expYear.slice(-2)}`);95  } else {96    if (fields.expMonth) setNativeValue(fields.expMonth, card.expMonth);97    if (fields.expYear) setNativeValue(fields.expYear, card.expYear);98  }99  if (fields.cvc) setNativeValue(fields.cvc, card.cvc);100  if (fields.name) setNativeValue(fields.name, card.cardholderName);101}102103export function formatCardNumber(raw: string): string {104  if (/^3[47]/.test(raw)) return raw.replace(/(\d{4})(\d{6})(\d{5})/, '$1 $2 $3');105  return raw.replace(/(\d{4})(?=\d)/g, '$1 ').trim();106}107108export function detectCardNetwork(number: string): import('../shared/types').CardNetwork {109  const n = number.replace(/\s/g, '');110  if (/^4/.test(n)) return 'visa';111  if (/^5[1-5]|^2[2-7]/.test(n)) return 'mastercard';112  if (/^3[47]/.test(n)) return 'amex';113  if (/^6(?:011|5)/.test(n)) return 'discover';114  return 'unknown';115}116117export function passesLuhn(number: string): boolean {118  const digits = number.replace(/\s/g, '').split('').map(Number);119  let sum = 0, isEven = false;120  for (let i = digits.length - 1; i >= 0; i--) {121    let d = digits[i]!;122    if (isEven) { d *= 2; if (d > 9) d -= 9; }123    sum += d;124    isEven = !isEven;125  }126  return sum % 10 === 0;127}128129export function extractLast4(number: string): string {130  return number.replace(/\s/g, '').slice(-4);131}