Design Online File-sharing System

Functional Requirements

• Users can upload files of various types (e.g., documents, images, videos).
• Users can download files they have access to.
• Users can share files by generating shareable links.
• File owners can specify access levels for shared links (e.g., view-only, edit).
• Option to set expiration dates on shareable links.
• Users can manage file permissions (Owner, Editor, Viewer) and modify them after sharing.
• Files are stored in a scalable cloud storage system.

Non-Functional Requirements

• System should support uploading and downloading large files efficiently (support for chunked uploads/downloads).
• The platform should be highly available and reliable.
• Data consistency must be maintained for file metadata and permissions.
• Access to files and links must be secure (authentication and authorization enforced).
• System should scale to support a large number of users and files.
• Reasonable response time for file operations (upload, download, sharing).
• Audit logging for file access and sharing events.