components/test/data/payments/get_challenge.js

/*
 * Copyright 2020 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

const kPaymentMethodIdentifier = 'secure-payment-confirmation';

/**
 * Returns the challenge generated by the secure payment confirmation app.
 * @param {string} credentialId - The base64 encoded identifier of the
 * credential to use for payment.
 * @param {string} totalAmount - The total amount to be charged.
 * @return {Promise<object>} - Either the challenge string or an error message.
 */
async function getChallenge(credentialId, totalAmount) { // eslint-disable-line no-unused-vars, max-len
  try {
    const request = createPaymentRequest(credentialId, totalAmount, false, '');
    const response = await request.show();
    await response.complete();
    return response.details.challenge;
  } catch (e) {
    return e.message;
  }
}

/**
 * Returns the challenge generated by the secure payment confirmation app with a
 * modified total amount.
 * @param {string} credentialId - The base64 encoded identifier of the
 * credential to use for payment.
 * @param {string} modifiedTotal - The total amount to be charged in the
 * modifier.
 * @return {Promise<object>} - Either the challenge string or an error message.
 */
async function getChallengeWithModifier(credentialId, modifiedTotal) { // eslint-disable-line no-unused-vars, max-len
  try {
    const request = createPaymentRequest(
        credentialId, '0', true, modifiedTotal);
    const response = await request.show();
    await response.complete();
    return response.details.challenge;
  } catch (e) {
    return e.message;
  }
}

/**
 * Returns the challenge generated by the secure payment confirmation app.
 * Passes a promise into PaymentRequest.show() that resolves with the finalized
 * price after 0.5 seconds.
 * @param {string} credentialId - The base64 encoded identifier of the
 * credential to use for payment.
 * @param {string} initialAmount - The initial, not yet final, amount to be
 * charged.
 * @param {string} finalizedAmount - The finalized amount to be charged.
 * @return {Promise<object>} - Either the challenge string or an error message.
 */
async function getChallengeWithShowPromise(credentialId, initialAmount, finalizedAmount) { // eslint-disable-line no-unused-vars, max-len
  try {
    const request = createPaymentRequest(
        credentialId, initialAmount, false, '');
    const response = await request.show(new Promise((resolve) => {
      window.setTimeout(() => {
        resolve(createDetails(finalizedAmount, false, ''));
      }, 500); // 0.5 seconds.
    }));
    await response.complete();
    return response.details.challenge;
  } catch (e) {
    return e.message;
  }
}

/**
 * Returns the challenge generated by the secure payment confirmation app.
 * Passes a promise into PaymentRequest.show() that resolves with the finalized
 * and modified price after 0.5 seconds.
 * @param {string} credentialId - The base64 encoded identifier of the
 * credential to use for payment.
 * @param {string} finalizedModifierAmount - The finalized amount to be charged.
 * @return {Promise<object>} - Either the challenge string or an error message.
 */
async function getChallengeWithModifierAndShowPromise(credentialId, finalizedModifierAmount) { // eslint-disable-line no-unused-vars, max-len
  try {
    const request = createPaymentRequest(credentialId, '0', false, '');
    const response = await request.show(new Promise((resolve) => {
      window.setTimeout(() => {
        resolve(createDetails('0', true, finalizedModifierAmount));
      }, 500); // 0.5 seconds.
    }));
    await response.complete();
    return response.details.challenge;
  } catch (e) {
    return e.message;
  }
}

/**
 * Creates a PaymentRequest object for secure payment confirmation method.
 * @param {string} credentialId - The base64 encoded identifier of the
 * credential to use for payment.
 * @param {string} totalAmount - The total amount to be charged.
 * @param {bool} withModifier - Whether modifier should be added.
 * @param {string} modifierAmount - The modifier amount, optional.
 * @return {PaymentRequest} - A PaymentRequest object.
 */
function createPaymentRequest(
    credentialId, totalAmount, withModifier, modifierAmount) {
  return new PaymentRequest(
    [{supportedMethods: kPaymentMethodIdentifier,
      data: {
       action: 'authenticate',
       credentialIds: [Uint8Array.from(atob(credentialId),
                                       (b) => b.charCodeAt(0))],
       networkData: new TextEncoder().encode('hello world'),
       timeout: 6000,
       fallbackUrl: 'https://fallback.example/url',
     },
    }],
    createDetails(totalAmount, withModifier, modifierAmount));
}

/**
 * Creates the payment details to be the second parameter of PaymentRequest
 * constructor.
 * @param {string} totalAmount - The total amount.
 * @param {bool} withModifier - Whether modifier should be added.
 * @param {string} modifierAmount - The modifier amount, optional.
 * @return {PaymentDetails} - The payment details with the given total amount.
 */
function createDetails(totalAmount, withModifier, modifierAmount) {
  let result = {
    total: {label: 'TEST', amount: {currency: 'USD', value: totalAmount}},
  };
  if (withModifier) {
    result.modifiers = [{
      supportedMethods: kPaymentMethodIdentifier,
      total: {
        label: 'MODIFIER TEST',
        amount: {currency: 'USD', value: modifierAmount}},
    }];
  }
  return result;
}