casbin-fastapi-decorator-jwt 0.1.4

JWT user provider for casbin-fastapi-decorator

casbin-fastapi-decorator-jwt

JWT user provider for casbin-fastapi-decorator.

Extracts and validates a JWT from the Bearer header and/or a cookie, returning the payload as the current user.

Installation

pip install casbin-fastapi-decorator-jwt

Or via the core package extra:

pip install "casbin-fastapi-decorator[jwt]"

Usage

from casbin_fastapi_decorator_jwt import JWTUserProvider

user_provider = JWTUserProvider(
    secret_key="your-secret",
    algorithm="HS256",             # default
    cookie_name="access_token",    # optional, enables reading from cookie
    user_model=UserSchema,         # optional, Pydantic model for payload validation
)

Pass it to PermissionGuard as the user_provider:

import casbin
from fastapi import FastAPI, HTTPException
from casbin_fastapi_decorator import PermissionGuard

async def get_enforcer() -> casbin.Enforcer:
    return casbin.Enforcer("model.conf", "policy.csv")

guard = PermissionGuard(
    user_provider=user_provider,
    enforcer_provider=get_enforcer,
    error_factory=lambda user, *rv: HTTPException(403, "Forbidden"),
)

app = FastAPI()

@app.get("/articles")
@guard.require_permission("articles", "read")
async def list_articles():
    return []

API

JWTUserProvider

JWTUserProvider(
    secret_key: str,
    algorithm: str = "HS256",
    cookie_name: str | None = None,
    user_model: type[BaseModel] | None = None,
)

Parameter	Description
secret_key	Secret used to verify the JWT signature
algorithm	JWT algorithm (default: "HS256")
cookie_name	If set, also reads the token from this cookie name
user_model	Pydantic model — if provided, the payload is validated via model_validate()

When called as a FastAPI dependency, the provider reads the token from:

1. Authorization: Bearer <token> header (always)
2. Cookie <cookie_name> (if cookie_name is set)

Development

See the workspace README for setup instructions.

task jwt:lint    # ruff + bandit + ty
task jwt:test    # pytest