refactoring

Resolve #7779

packages/backend/src/misc/content-disposition.ts

@@ -0,0 +1,6 @@
+const cd = require('content-disposition');
+
+export function contentDisposition(type: 'inline' | 'attachment', filename: string): string {
+	const fallback = filename.replace(/[^\w.-]/g, '_');
+	return cd(filename, { type, fallback });
+}