finxol.io
Personal site
staging.colinozanne.co.uk
portfolio
astro
1import { defineMiddleware } from "astro:middleware";
2import { config, isDev } from "./config.ts";
3
4export const onRequest = isDev && defineMiddleware((context, next) => {
5 const { url } = context;
6
7 // Get the locale from the domain
8 const host = context.request.headers.get("x-forwarded-host") ||
9 context.request.headers.get("host") ||
10 url.host;
11
12 // Find which locale this domain corresponds to
13 let domainLocale: string | undefined;
14 for (const [locale, domain] of Object.entries(config.domains)) {
15 const domainHost = new URL(domain as string).host;
16 if (host === domainHost) {
17 domainLocale = locale;
18 break;
19 }
20 }
21
22 // If we're on a domain-mapped locale and the path doesn't start with the locale prefix,
23 // internally rewrite to add the prefix
24 if (domainLocale && url.pathname === "/") {
25 // Rewrite / to /{locale}/
26 return context.rewrite(`/${domainLocale}/`);
27 }
28
29 // For other paths without locale prefix, also rewrite
30 if (
31 domainLocale && !url.pathname.startsWith(`/${domainLocale}/`) &&
32 !url.pathname.startsWith(`/${domainLocale}`) &&
33 !url.pathname.startsWith("/_")
34 ) {
35 // Check if the path starts with any other locale
36 const startsWithOtherLocale = config.locales.some(
37 (l: string) =>
38 l !== domainLocale &&
39 (url.pathname.startsWith(`/${l}/`) || url.pathname === `/${l}`),
40 );
41
42 if (!startsWithOtherLocale) {
43 return context.rewrite(`/${domainLocale}${url.pathname}`);
44 }
45 }
46
47 return next();
48});