FastAPI Authorization Without Middleware: Decorator-Based Casbin Integration

Authorization in FastAPI tends to start clean and quietly become a mess. One Depends(require_admin) , then Depends(require_editor) , then Depends(require_editor_or_admin_but_only_on_weekdays) ... and three months later nobody wants to touch the permissions file. I've been there. So I wrote casbin-fastapi-decorator — a library that brings Casbin into FastAPI with zero middleware, using a decorator factory pattern. One decorator above each route. No boilerplate in function signatures. 📦 PyPI: pypi.org/project/casbin-fastapi-decorator 🐙 GitHub: github.com/Neko1313/casbin-fastapi-decorator 📖 Docs: neko1313.github.io/casbin-fastapi-decorator-docs The Problem Standard FastAPI authorization ends up looking like this: async def require_admin ( user = Depends ( get_current_user )): if user . role != " admin " : raise HTTPException ( 403 , " Forbidden " ) return user async def require_editor ( user = Depends ( get_current_user )): if user . role not in ( " admin " , " editor " ): raise HTTPExcep