b3dmar-auth-core
Authentication primitives for FastAPI services
A shared library for JWT handling, password hashing, RBAC, and token revocation - extracted from production services and designed to drop into any FastAPI project.
1 min read
Why this exists
Every FastAPI service needs authentication, and the patterns are always the same: validate JWTs, hash passwords, check permissions, handle token revocation. Rather than copying this logic across 3ngram, Climbr, and future services, we extracted the common patterns into a tested, documented library.
What it provides
JWT module - token creation and validation with type discrimination (access vs. refresh), JTI tracking, and configurable issuer/audience claims.
Password module - Argon2id hashing following OWASP recommendations. Drop-in replacement for bcrypt with better resistance to GPU and side-channel attacks.
RBAC module - generic permission checker with FastAPI dependency factories. You define the permission matrix; the library handles enforcement.
Revocation module - Redis-backed token denylist with configurable fail-open (allow if Redis is down) or fail-closed (deny if Redis is down) modes, depending on your security requirements.
Rate limiting - pre-configured slowapi limiter for auth endpoints to prevent brute-force attacks.
Schemas - Pydantic v2 models for token payloads and auth responses.
Design principles
Stateless and composable. Each module works independently. Use all of them or just the JWT validation.
Domain-agnostic. No opinion on your user model, database, or tenancy scheme. You bring your own user lookup - the library handles the auth mechanics.
Production-tested. Every primitive runs in production across multiple services before being extracted here.
Getting started
pip install git+https://github.com/sebastianebg/b3dmar-auth-core.gitSee the repository README and cookbook/ directory for integration examples covering common patterns: basic JWT auth, multi-tenant RBAC, refresh token rotation, and revocation setup.