file-uploads

File uploads are attacker-controlled input with extra surface area. I validate extension and MIME type, rename everything server side, scan risky formats, and keep user uploads out of executable paths. If the business allows arbitrary uploads, storage

ActiveStorage provides a unified interface for uploading files to cloud storage services like S3, GCS, or Azure Storage. I configure storage services in config/storage.yml and attach files to models using has_one_attached or has_many_attached macros.

Modern file uploads should support drag-and-drop in addition to traditional file inputs. I use Stimulus to handle dragover, drop, and paste events, showing upload previews and progress. The controller prevents default browser behavior for drag events