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lib/auth/teacherAllowlist.ts

@@ -0,0 +1,16 @@
+const parseTeacherEmails = (source: string | undefined): string[] =>
+  (source ?? "")
+    .split(",")
+    .map((email) => email.trim().toLowerCase())
+    .filter(Boolean);
+
+export const readTeacherEmailsServer = (): string[] => parseTeacherEmails(process.env.TEACHER_EMAILS);
+
+export const readTeacherEmailsBrowser = (): string[] =>
+  parseTeacherEmails(process.env.NEXT_PUBLIC_TEACHER_EMAILS);
+
+export const isTeacherEmailAllowed = (email: string | null, allowed: string[]): boolean => {
+  if (!email) return false;
+  if (allowed.length === 0) return false;
+  return allowed.includes(email.toLowerCase());
+};