fxa/_scripts/config-fxios.js

#!/usr/bin/env node

var path = require('path');

var r = require('replace-in-file');

var ios_path = process.env.FIREFOX_IOS_HOME;

if (! ios_path) {
  throw new Error('FIREFOX_IOS_HOME is not set');
}

var config_path = path.join(ios_path, 'Account', 'FirefoxAccountConfiguration.swift');

function replace(options) {
  return new Promise(function (resolve, reject) {
    r(options, function(err) {
      if (err) reject(err);
      resolve();
    })
  });
}

return replace({
  files: config_path,
  replace: /https:\/\/accounts.firefox.com/g,
  with: 'http://127.0.0.1:3030'
}).then(function () {
  return replace({
    files: config_path,
    replace: 'https://api.accounts.firefox.com/v1',
    with: 'http://127.0.0.1:9000/v1'
  });
}).then(function () {
  return replace({
    files: config_path,
    replace: 'https://oauth.accounts.firefox.com/v1',
    with: 'http://127.0.0.1:9010/v1'
  });
}).then(function () {
  return replace({
    files: config_path,
    replace: 'https://profile.accounts.firefox.com/v1',
    with: 'http://localhost:1111/v1'
  });
});