DEMO：https://s3.fujisaki.top/public/blog/demo.html
Overview
R2 Gateway is a lightweight object storage gateway built on top of S3-compatible services such as Cloudflare R2. The system focuses on cost safety, introducing a control mechanism that automatically disables access once usage exceeds a predefined threshold, preventing unexpected billing.
Key Features
- Cost Limit Enforcement (Core Feature)
- Monitors storage or traffic usage
- Automatically blocks requests when exceeding configured limits
- Prevents uncontrolled cost growth in pay-as-you-go environments
- S3-Compatible API Layer
Supports standard object storage operations (upload, download, list), enabling seamless integration with existing tools - Gateway-Based Control Layer
All requests pass through the gateway, allowing:- Centralized quota enforcement
- Request filtering / rejection
- Unified access management
- Direct HTTP File Serving
Provides URL-based access to stored objects for static assets (e.g., PDFs, images)
Technical Highlights
- Quota-Aware Request Interception
Each incoming request is checked against usage limits before being forwarded, ensuring strict cost control - Fail-Fast Mechanism
Requests are immediately rejected once thresholds are exceeded, avoiding unnecessary backend operations - Lightweight Deployment
Designed for self-hosted environments (VPS), with Docker-based deployment support - Extensible Storage Abstraction
Compatible with any S3-like backend beyond Cloudflare R2
Use Cases
- Personal projects requiring strict budget control
- Preventing unexpected cloud storage bills
- Self-hosted file services with usage limits
- Static asset hosting with safety constraints