Support defaultLanguage as a function (#38)

.gitignore

@@ -35,6 +35,6 @@ yarn-error.log*
 
 # lib build
 *.js
-!src/*.js
+!src/**/*.js
 !__tests__/*.js
 !examples/**/*.js

README.md

@@ -273,7 +273,7 @@ In order to use each translation in the project, use the _translation id_ compos
 
 | Option | Description | Type | Default |
 | ----------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------- | -------------------------------------------------------------------------- |
-| `defaultLanguage` | A string with the ISO locale ("en" as default).    | `string`  | `"en"` |
+| `defaultLanguage` | A string with the ISO locale ("en" as default). Also you can pass it as a function to return the language depending the `req` param (in case to use a server). | `string|function` | `"en"` |
 | `allLanguages` | An array with all the languages to use in the project. | `Array<string>` | `[]` |
 | `ignoreRoutes` | An array with all the routes to ignore in the middleware. This config property only effect using a custom server with the `i18nMiddleware`. | `Array<string>` | `['/_next/', '/static/', '/favicon.ico', '/manifest.json', '/robots.txt']` |
 | `redirectToDefaultLang` | When is set to `true` the route `/some-page` redirects to `/en/some-path` (if `en` is the default language). When is set to `false` entering to `/some-path` is rendering the page with the default language but without redirecting. IT ONLY APPLIES using a server with the `i18nMiddleware`. | `boolean` | `false` |

__tests__/i18nMiddleware.test.js

@@ -46,7 +46,7 @@ describe('i18nMiddleware', () => {
  server2 = await loadServerWithMiddleware(
  {
  allLanguages,
- defaultLanguage,
+ defaultLanguage: () => defaultLanguage,
  redirectToDefaultLang: true,
  },
  3006

examples/with-server/i18n.js

@@ -1,6 +1,22 @@
+const defaultLangsFromHost = {
+ 'uk.co': 'en',
+ cat: 'ca',
+ com: 'ca',
+ default: 'es', // localhost
+}
+
+function getDomain(host) {
+ const domain = host.split('.')
+ return domain[domain.length - 1]
+}
+
 module.exports = {
  allLanguages: ['en', 'ca', 'es'],
- defaultLanguage: 'es',
+ defaultLanguage: req => {
+ let host = req ? req.get('Host') : window.location.hostname
+ const domain = getDomain(host)
+ return defaultLangsFromHost[domain] || defaultLangsFromHost.default
+ },
  redirectToDefaultLang: true,
  loadLocaleFrom: (lang, ns) =>
  import(`./locales/${lang}/${ns}.json`).then(m => m.default),

package.json

@@ -1,6 +1,6 @@
 {
  "name": "next-translate",
- "version": "0.3.1",
+ "version": "0.4.0",
  "description": "Next.js utility to translate pages without the need of a server (static i18n pages generator).",
  "license": "MIT",
  "keywords": [
@@ -38,16 +38,16 @@
  "next-translate": "./cli/builder.js"
  },
  "devDependencies": {
- "@babel/cli": "7.7.7",
- "@babel/core": "7.7.7",
- "@babel/preset-env": "7.7.7",
+ "@babel/cli": "7.8.3",
+ "@babel/core": "7.8.3",
+ "@babel/preset-env": "7.8.3",
  "@testing-library/react": "9.4.0",
- "babel-jest": "24.9.0",
+ "babel-jest": "25.1.0",
  "babel-plugin-transform-es2015-modules-commonjs": "6.26.2",
  "babel-preset-minify": "0.5.1",
  "express": "4.17.1",
- "husky": "4.0.1",
- "jest": "24.9.0",
+ "husky": "4.2.1",
+ "jest": "25.1.0",
  "next": "9.1.7",
  "prettier": "1.19.1",
  "pretty-quick": "2.0.1",

src/_helpers/getDefaultLang.js

@@ -0,0 +1,6 @@
+export default function getDefaultLang(req, config) {
+ if (typeof config.defaultLanguage === 'function') {
+ return config.defaultLanguage(req)
+ }
+ return config.defaultLanguage
+}

src/appWithI18n.js

@@ -1,16 +1,17 @@
 import React from 'react'
 import I18nProvider from './I18nProvider'
+import getDefaultLang from './_helpers/getDefaultLang'
 
 function getLang(ctx, config) {
  const { req, asPath = '' } = ctx
 
- if (req) return req.query.lang || config.defaultLanguage
+ if (req) return req.query.lang || getDefaultLang(req, config)
 
  const startsWithLang = config.allLanguages.some(l =>
  asPath.startsWith(`/${l}`)
  )
 
- return startsWithLang ? asPath.split('/')[1] : config.defaultLanguage
+ return startsWithLang ? asPath.split('/')[1] : getDefaultLang(req, config)
 }
 
 function removeTrailingSlash(path = '') {

src/i18nMiddleware.js

@@ -1,3 +1,5 @@
+import getDefaultLang from './_helpers/getDefaultLang'
+
 export default function i18nMiddleware(config = {}) {
  const {
  ignoreRoutes = [
@@ -7,7 +9,6 @@ export default function i18nMiddleware(config = {}) {
  '/manifest.json',
  '/robots.txt',
  ],
- defaultLanguage = 'en',
  allLanguages = [],
  redirectToDefaultLang = false,
  } = config
@@ -26,6 +27,8 @@ export default function i18nMiddleware(config = {}) {
  * Redirect or add lang without redirecting (depending the config)
  */
  if (!startsWithLang) {
+ const defaultLanguage = getDefaultLang(req, config) || 'en'
+
  if (redirectToDefaultLang) {
  res.redirect(301, `/${defaultLanguage}${req.url}`)
  return