Enrollment + almost all auth

lib/appUrl.ts

@@ -0,0 +1,14 @@
+export function getBaseUrl(req?: Request) {
+  const envUrl = process.env.APP_BASE_URL || process.env.NEXT_PUBLIC_APP_URL;
+  if (envUrl) return String(envUrl).replace(/\/+$/, "");
+  if (!req) return "http://localhost:3000";
+
+  const forwardedProto = req.headers.get("x-forwarded-proto");
+  const proto = forwardedProto ? forwardedProto.split(",")[0].trim() : new URL(req.url).protocol.replace(":", "");
+  const host =
+    req.headers.get("x-forwarded-host") ||
+    req.headers.get("host") ||
+    new URL(req.url).host;
+
+  return `${proto}://${host}`;
+}