write middleware for lingui

Author: dimensi

.babelrc

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+{
+  "presets": ["next/babel"],
+  "plugins": [
+    "macros"
+  ]
+}

.editorconfig

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+root = true
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_style = space
+indent_size = 2
+max_line_length = 100

.eslintrc

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+{
+  "extends": ["standard", "standard-react"],
+  "plugins": ["react-hooks"],
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "node": true
+  },
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "sourceType": "module"
+  },
+  "rules": {
+    "comma-dangle": ["error", "always-multiline"],
+    "react-hooks/rules-of-hooks": "error"
+  }
+}

.gitignore

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+
+# Created by https://www.gitignore.io/api/node
+# Edit at https://www.gitignore.io/?templates=node
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# End of https://www.gitignore.io/api/node

.linguirc

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+{
+  "localeDir": "src/locales/",
+  "srcPathDirs": ["src/", "pages/"],
+  "srcPathIgnorePatterns": [
+        "/node_modules/",
+        "/.next/",
+  ],
+  "format": "minimal",
+  "sourceLocale": "ru",
+  "compileNamespace": "window.LINGUI_CATALOG"
+}

lib/middleware.js

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+const pathMatch = require('path-match')()
+
+/**
+ *
+ * @param {object} options
+ * @param {import('next').Server} nextApp
+ * @returns {import('express').Handler[]}
+ */
+function createMiddleware ({ locales, defaultLocale, subPaths, ignoreRoutes }, nextApp) {
+  const localesWithoutDefault = () => locales.filter(lang => lang !== defaultLocale)
+  const forseTrallingSlash = (path) => localesWithoutDefault().some(lng => path === `/${lng}`) ? `${path}/` : path
+  const ignoreRegex = new RegExp(`^/(?!${ignoreRoutes.map(x => x.replace('/', '')).join('|')}).*$`)
+  const ignoreRoute = pathMatch(ignoreRegex)
+  const isI18nRoute = req => ignoreRoute(req.url) && req.method === 'GET'
+  console.log(`/:lang(${localesWithoutDefault()
+    .join('|')})?/*`)
+  const routeWithLang = pathMatch(`/:lang(${localesWithoutDefault()
+    .join('|')})?/*`)
+  const parseRoute = pathname => routeWithLang(pathname)
+  /**
+   * @type {import('express').Handler[]}
+   */
+  const middlewares = []
+
+  middlewares.push((req, res, next) => {
+    if (isI18nRoute(req)) {
+      req.lingui = {
+        locale: req.cookies.locale || req.acceptsLanguages(locales) || defaultLocale,
+        locales,
+        defaultLocale,
+      }
+    }
+    next()
+  })
+
+  if (subPaths) {
+    middlewares.push((req, res, next) => {
+      if (!isI18nRoute(req)) return next()
+      const pathname = forseTrallingSlash(req.path)
+      const { lang, 0: otherPath } = parseRoute(pathname)
+      const { lingui: { locale: userLocale } } = req
+      req.url = otherPath ? `/${otherPath}` : '/'
+
+      if (userLocale === defaultLocale && lang == null) {
+        return next()
+      }
+
+      if (userLocale === lang) {
+        return next()
+      }
+
+      if (userLocale === defaultLocale && lang != null) {
+        return res.redirect(`/${otherPath}`)
+      }
+
+      return res.redirect(`/${userLocale}${otherPath ? `/${otherPath}` : ''}`)
+    })
+  }
+
+  return middlewares
+}
+
+module.exports = createMiddleware