personal waitlist link

server/utils/waitlistReferrals.ts

@@ -0,0 +1,20 @@
+import { randomBytes } from 'node:crypto'
+
+export const WAITLIST_REFERRAL_TOKEN_PATTERN = /^[A-F0-9]{8}$/
+
+export function generateWaitlistReferralToken() {
+  return randomBytes(4).toString('hex').toUpperCase()
+}
+
+export function normalizeWaitlistReferralToken(value?: unknown) {
+  if (typeof value !== 'string') {
+    return null
+  }
+
+  const token = value.trim().toUpperCase()
+  if (!WAITLIST_REFERRAL_TOKEN_PATTERN.test(token)) {
+    return null
+  }
+
+  return token
+}