adds optin service

Author: daveajrussell

src/browser/services/preview-optin-service.ts

@@ -0,0 +1,123 @@
+const EMEA_LOCALES = [
+  'bg-bg',
+  'cs-cz',
+  'cy-gb',
+  'da-dk',
+  'de-de',
+  'el-gr',
+  'en-gb',
+  'et-ee',
+  'fi-fi',
+  'fr-fr',
+  'ga-ie',
+  'hr-hr',
+  'hu-hu',
+  'is-is',
+  'it-it',
+  'lb-lu',
+  'lt-lt',
+  'lv-lv',
+  'mk-mk',
+  'mt-mt',
+  'nl-nl',
+  'no-no',
+  'pl-pl',
+  'pt-pt',
+  'ro-ro',
+  'ru-ru',
+  'sk-sk',
+  'sl-si',
+  'sr-rs',
+  'sv-se',
+  'uk-ua'
+]
+
+const APAC_LOCALES = [
+  'as-in',
+  'az-az',
+  'bn-bd',
+  'bn-in',
+  'bo-cn',
+  'fil-ph',
+  'gu-in',
+  'hi-in',
+  'hy-am',
+  'id-id',
+  'ja-jp',
+  'ka-ge',
+  'km-kh',
+  'kn-in',
+  'ko-kr',
+  'lo-la',
+  'ml-in',
+  'mn-mn',
+  'mr-in',
+  'ms-my',
+  'my-mm',
+  'ne-np',
+  'or-in',
+  'pa-in',
+  'ps-af',
+  'sa-in',
+  'si-lk',
+  'ta-in',
+  'te-in',
+  'th-th',
+  'tr-tr',
+  'ug-cn',
+  'ur-in',
+  'ur-pk',
+  'vi-vn',
+  'zh-cn',
+  'zh-hk',
+  'zh-tw'
+]
+
+const AMERICAS_LOCALES = [
+  'ay-bo',
+  'en-029',
+  'en-ca',
+  'en-us',
+  'es-419',
+  'es-ar',
+  'es-bo',
+  'es-cl',
+  'es-co',
+  'es-cr',
+  'es-cu',
+  'es-do',
+  'es-ec',
+  'es-gq',
+  'es-gt',
+  'es-hn',
+  'es-mx',
+  'es-ni',
+  'es-pa',
+  'es-pe',
+  'es-pr',
+  'es-py',
+  'es-sv',
+  'es-uy',
+  'es-ve',
+  'fr-029',
+  'fr-ca',
+  'gn-py',
+  'pt-419',
+  'pt-br',
+  'qu-pe'
+]
+
+const OPTED_IN_LOCALES = [...EMEA_LOCALES]
+
+const userPrefersQuery = (): boolean => {
+  const prefersOldBrowser = localStorage.getItem('prefersOldBrowser')
+  const doesPreferQuery = prefersOldBrowser === 'false'
+  return doesPreferQuery || prefersOldBrowser === null
+}
+
+export const optedInByRegion = (): boolean => {
+  return (
+    OPTED_IN_LOCALES.includes(navigator.language.toLowerCase()) &&
+    userPrefersQuery()
+  )
+}