Generate redirects from an environment variable

Used for redirecting city domains (which point to the same Netlify deployment) to their city in the country domain instead, to not have duplicate content under multiple domains.

[skip ci]

Author: sisou

nuxt.config.ts

@@ -70,6 +70,7 @@ export default defineNuxtConfig({
     defaultImport: 'component'
   },
   runtimeConfig: {
+    REDIRECT_RULES: process.env.REDIRECT_RULES,
     public: {
       GOOGLE_MAPS_API: process.env.GOOGLE_MAPS_API,
       SUPA_KEY: process.env.SUPA_KEY,

server/middleware/city-redirects.ts

@@ -0,0 +1,22 @@
+export default defineEventHandler(async (event) => {
+    if (!useRuntimeConfig().REDIRECT_RULES) return
+
+    const url = getRequestURL(event)
+
+    /**
+     * This expects a value of this format:
+     * `targetdomain.com,citydomain1.com:cityname1,citydomain2.com:cityname2`
+     */
+    const [targetdomain, ...redirects] = useRuntimeConfig().REDIRECT_RULES.split(',')
+
+    const defaultLocale = useRuntimeConfig().public.DATO_DEFAULT_LOCALE || 'en'
+
+    for (const redirect of redirects) {
+        const [citydomain, cityname] = redirect.split(':')
+
+        if (url.hostname === citydomain.trim()) {
+            await sendRedirect(event, `https://${targetdomain.trim()}/${defaultLocale}/cities/${cityname.trim()}`, 301)
+            break;
+        }
+    }
+})