add auth

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

@@ -1,11 +1,15 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getLibrary, removeLibrary } from '@/lib/libraries'
 import { removeAllAssignmentsForLibrary } from '@/lib/tags'
+import { requireAdmin } from '@/lib/auth'
 
 export async function DELETE(
-  _request: NextRequest,
+  request: NextRequest,
   { params }: { params: Promise<{ id: string }> }
 ) {
+  const auth = await requireAdmin(request)
+  if (auth instanceof NextResponse) return auth
+
   const { id } = await params
 
   const library = getLibrary(id)