feat(go): referral support (#28345)

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

packages/console/app/src/lib/referral-invite.ts

@@ -0,0 +1,28 @@
+import { Referral } from "@opencode-ai/console-core/referral.js"
+
+const REFERRAL_COOKIE = "oc_referral"
+const REFERRAL_MAX_AGE = 60 * 60 * 24 * 30
+
+export function normalizeReferralCode(code?: string | null) {
+  return Referral.normalizeCode(code)
+}
+
+export function referralCookie(code: string) {
+  return `${REFERRAL_COOKIE}=${encodeURIComponent(code)}; Path=/; Max-Age=${REFERRAL_MAX_AGE}; SameSite=Lax; HttpOnly`
+}
+
+export function clearReferralCookie() {
+  return `${REFERRAL_COOKIE}=; Path=/; Max-Age=0; SameSite=Lax; HttpOnly`
+}
+
+export function referralCodeFromCookieHeader(header: string | null) {
+  if (!header) return undefined
+
+  return normalizeReferralCode(
+    header
+      .split(";")
+      .map((x) => x.trim())
+      .find((x) => x.startsWith(`${REFERRAL_COOKIE}=`))
+      ?.slice(`${REFERRAL_COOKIE}=`.length),
+  )
+}