Add endpoint to poll a creation's status

src/app/api/create/[id]/route.ts

@@ -0,0 +1,17 @@
+import { NextResponse } from "next/server";
+import { getCurrentUser } from "@/lib/session";
+import { getCreatedById } from "@/lib/createdLessons";
+
+// Poll the status of a creation (owner or admin).
+export async function GET(_req: Request, ctx: { params: Promise<{ id: string }> }) {
+  const user = await getCurrentUser();
+  if (!user) return NextResponse.json({ error: "Log in." }, { status: 401 });
+
+  const { id } = await ctx.params;
+  const row = getCreatedById(Number(id));
+  if (!row) return NextResponse.json({ error: "Not found." }, { status: 404 });
+  if (row.user_id !== user.id && user.role !== "admin")
+    return NextResponse.json({ error: "Not authorized." }, { status: 403 });
+
+  return NextResponse.json({ id: row.id, slug: row.slug, status: row.status, error: row.error, subject: row.subject });
+}