Media Uploader (Cloudflare R2 + Gin)

Backend API + dashboard untuk upload media ke Cloudflare R2 dengan presigned URL pattern. Dibuat untuk UAS Golang - integrasi Object Storage pihak ke-3.

Stack

• Backend: Go + Gin Framework
• Database: MySQL (user & metadata)
• Object Storage: Cloudflare R2 (S3-compatible)
• Auth: JWT (HS256)
• Frontend: HTML + JS native (no framework)

Struktur

uas/
├── main.go              # entry point + routing
├── koneksi.go           # MySQL connection
├── controllers/
│   ├── auth.go          # register + login
│   └── media.go         # presigned URL, upload, list, delete
├── middleware/
│   └── auth.go          # JWT middleware
├── models/
│   └── models.go        # User, Media structs
├── web/
│   └── index.html       # dashboard HTML/JS
├── schema.sql           # MySQL schema
└── .env.example

Setup Lokal

Deployment ke Railway

1. Push repo ke GitHub
2. Buka railway.app → New Project → Deploy from GitHub
3. Pilih repo ini, set root directory: uas
4. Tambah MySQL service di Railway (atau pakai MySQL external)
5. Set environment variables di Railway sama seperti .env
6. Railway auto-detect Go → langsung build & deploy

Alur Upload (Presigned URL)

1. Frontend request presigned URL → backend
2. Backend generate URL → return ke frontend
3. Frontend upload file langsung ke R2 (tidak lewat backend)
4. Frontend konfirmasi ke backend → simpan metadata ke MySQL
5. List media dari MySQL, preview via presigned GET URL

Catatan

• File benar-benar tersimpan di Cloudflare R2 (cek dashboard R2)
• Database MySQL hanya menyimpan metadata (id, user, filename, r2_key, dll)
• ponytail: Presigned URL expire 15 menit (upload) & 1 jam (view). Cukup untuk demo, tambah waktu jika production.