Stage 1: Course/Module/Lesson CRUD admin UI with TipTap editor

src/app/api/admin/upload/route.ts

@@ -0,0 +1,23 @@
+import { NextRequest, NextResponse } from "next/server";
+import { headers } from "next/headers";
+import { auth } from "@/lib/auth";
+import { uploadFile } from "@/lib/s3";
+import { randomUUID } from "crypto";
+
+export async function POST(req: NextRequest) {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session || session.user.role !== "admin") {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+
+  const form = await req.formData();
+  const file = form.get("file") as File | null;
+  if (!file) return NextResponse.json({ error: "No file" }, { status: 400 });
+
+  const ext = file.name.split(".").pop() ?? "bin";
+  const key = `uploads/${randomUUID()}.${ext}`;
+  const buffer = Buffer.from(await file.arrayBuffer());
+
+  const url = await uploadFile(key, buffer, file.type);
+  return NextResponse.json({ url, key });
+}