feat(go): referral support (#28345)

Co-authored-by: Jack <jack@anoma.ly>

packages/console/app/src/middleware.ts

@@ -1,16 +1,20 @@
 import { createMiddleware } from "@solidjs/start/middleware"
 import { LOCALE_HEADER, cookie, fromPathname, strip } from "~/lib/language"
+import { normalizeReferralCode, referralCookie } from "~/lib/referral-invite"
 
 export default createMiddleware({
   onRequest(event) {
     const url = new URL(event.request.url)
     const locale = fromPathname(url.pathname)
-    if (!locale) return
+    if (locale) {
+      url.pathname = strip(url.pathname)
+      const request = new Request(url, event.request)
+      request.headers.set(LOCALE_HEADER, locale)
+      event.request = request
+      event.response.headers.append("set-cookie", cookie(locale))
+    }
 
-    url.pathname = strip(url.pathname)
-    const request = new Request(url, event.request)
-    request.headers.set(LOCALE_HEADER, locale)
-    event.request = request
-    event.response.headers.append("set-cookie", cookie(locale))
+    const referralCode = normalizeReferralCode(url.searchParams.get("ref"))
+    if (referralCode) event.response.headers.append("set-cookie", referralCookie(referralCode))
   },
 })