# fastapi-casbin-auth
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[](https://pypi.org/project/fastapi-casbin-auth/)
[](https://pypi.org/project/fastapi-casbin-auth/)
[](https://pypi.org/project/fastapi-casbin-auth/)
[](https://pypi.org/project/fastapi-casbin-auth/)
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fastapi-casbin-auth is an authorization middleware for [FastAPI](https://fastapi.tiangolo.com/), it's based on [PyCasbin](https://github.com/casbin/pycasbin).
## Installation
Install from pip
```bash
pip install fastapi-casbin-auth
```
Clone this repo
```bash
git clone https://github.com/officialpycasbin/fastapi-casbin-auth.git
python setup.py install
```
## Quickstart
This middleware is designed to work with another middleware which implement `AuthenticationMiddleware` interface.
```python
import base64
import binascii
import casbin
from fastapi import FastAPI
from starlette.authentication import AuthenticationBackend, AuthenticationError, SimpleUser, AuthCredentials
from starlette.middleware.authentication import AuthenticationMiddleware
from fastapi_casbin_auth import CasbinMiddleware
app = FastAPI()
class BasicAuth(AuthenticationBackend):
async def authenticate(self, request):
if "Authorization" not in request.headers:
return None
auth = request.headers["Authorization"]
try:
scheme, credentials = auth.split()
decoded = base64.b64decode(credentials).decode("ascii")
except (ValueError, UnicodeDecodeError, binascii.Error):
raise AuthenticationError("Invalid basic auth credentials")
username, _, password = decoded.partition(":")
return AuthCredentials(["authenticated"]), SimpleUser(username)
enforcer = casbin.Enforcer('../examples/rbac_model.conf', '../examples/rbac_policy.csv')
app.add_middleware(CasbinMiddleware, enforcer=enforcer)
app.add_middleware(AuthenticationMiddleware, backend=BasicAuth())
@app.get('/')
async def index():
return "If you see this, you have been authenticated."
@app.get('/dataset1/protected')
async def auth_test():
return "You must be alice to see this."
```
- anonymous request
```bash
curl -i http://127.0.0.1:8000/dataset1/protected
```
```bash
HTTP/1.1 403 Forbidden
date: Mon, 01 Mar 2021 09:00:08 GMT
server: uvicorn
content-length: 11
content-type: application/json
"Forbidden"
```
- authenticated request
```bash
curl -i -u alice:password http://127.0.0.1:8000/dataset1/protected
```
```bash
HTTP/1.1 200 OK
date: Mon, 01 Mar 2021 09:04:54 GMT
server: uvicorn
content-length: 32
content-type: application/json
"You must be alice to see this."
```
It used the casbin config from `examples` folder, and you can find this demo in `demo` folder.
You can also view the unit tests to understand this middleware.
Besides, there is another example for `CasbinMiddleware` which is designed to work with JWT authentication. You can find
it in `demo/jwt_test.py`.
## Development
### Run unit tests
1. Fork/Clone repository
2. Install fastapi-casbin-auth dependencies, and run `pytest`
```bash
pip install -r dev_requirements.txt
pip install -r requirements.txt
pytest
```
### Update requirements with pip-tools
```bash
# update requirements.txt
pip-compile --no-annotate --no-header --rebuild requirements.in
# sync venv
pip-sync
```
### Manually Bump Version
```
bumpversion major # major release
or
bumpversion minor # minor release
or
bumpversion patch # hotfix release
```
## Documentation
The authorization determines a request based on ``{subject, object, action}``, which means what ``subject`` can perform
what ``action`` on what ``object``. In this plugin, the meanings are:
1. ``subject``: the logged-in user name
2. ``object``: the URL path for the web resource like `dataset1/item1`
3. ``action``: HTTP method like GET, POST, PUT, DELETE, or the high-level actions you defined like "read-file", "
write-blog" (currently no official support in this middleware)
For how to write authorization policy and other details, please refer
to [the Casbin's documentation](https://casbin.org).
## Getting Help
- [Casbin](https://casbin.org)
## License
This project is under Apache 2.0 License. See the [LICENSE](LICENSE) file for the full license text.
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"description": "# fastapi-casbin-auth\n\n[](https://github.com/officialpycasbin/fastapi-casbin-auth/actions/workflows/release.yml)\n[](https://coveralls.io/github/officialpycasbin/fastapi-casbin-auth)\n[](https://pypi.org/project/fastapi-casbin-auth/)\n[](https://pypi.org/project/fastapi-casbin-auth/)\n[](https://pypi.org/project/fastapi-casbin-auth/)\n[](https://pypi.org/project/fastapi-casbin-auth/)\n[](https://discord.gg/S5UjpzGZjN)\n\nfastapi-casbin-auth is an authorization middleware for [FastAPI](https://fastapi.tiangolo.com/), it's based on [PyCasbin](https://github.com/casbin/pycasbin).\n\n## Installation\n\nInstall from pip\n\n```bash\npip install fastapi-casbin-auth\n```\n\nClone this repo\n\n```bash\ngit clone https://github.com/officialpycasbin/fastapi-casbin-auth.git\npython setup.py install\n```\n\n## Quickstart\n\nThis middleware is designed to work with another middleware which implement `AuthenticationMiddleware` interface.\n\n```python\nimport base64\nimport binascii\n\nimport casbin\n\nfrom fastapi import FastAPI\nfrom starlette.authentication import AuthenticationBackend, AuthenticationError, SimpleUser, AuthCredentials\nfrom starlette.middleware.authentication import AuthenticationMiddleware\n\nfrom fastapi_casbin_auth import CasbinMiddleware\n\napp = FastAPI()\n\n\nclass BasicAuth(AuthenticationBackend):\n async def authenticate(self, request):\n if \"Authorization\" not in request.headers:\n return None\n\n auth = request.headers[\"Authorization\"]\n try:\n scheme, credentials = auth.split()\n decoded = base64.b64decode(credentials).decode(\"ascii\")\n except (ValueError, UnicodeDecodeError, binascii.Error):\n raise AuthenticationError(\"Invalid basic auth credentials\")\n\n username, _, password = decoded.partition(\":\")\n return AuthCredentials([\"authenticated\"]), SimpleUser(username)\n\n\nenforcer = casbin.Enforcer('../examples/rbac_model.conf', '../examples/rbac_policy.csv')\n\napp.add_middleware(CasbinMiddleware, enforcer=enforcer)\napp.add_middleware(AuthenticationMiddleware, backend=BasicAuth())\n\n\n@app.get('/')\nasync def index():\n return \"If you see this, you have been authenticated.\"\n\n\n@app.get('/dataset1/protected')\nasync def auth_test():\n return \"You must be alice to see this.\"\n```\n\n- anonymous request\n\n```bash\ncurl -i http://127.0.0.1:8000/dataset1/protected\n```\n\n```bash\nHTTP/1.1 403 Forbidden\ndate: Mon, 01 Mar 2021 09:00:08 GMT\nserver: uvicorn\ncontent-length: 11\ncontent-type: application/json\n\n\"Forbidden\"\n```\n\n- authenticated request\n\n```bash\ncurl -i -u alice:password http://127.0.0.1:8000/dataset1/protected\n```\n\n```bash\nHTTP/1.1 200 OK\ndate: Mon, 01 Mar 2021 09:04:54 GMT\nserver: uvicorn\ncontent-length: 32\ncontent-type: application/json\n\n\"You must be alice to see this.\"\n```\n\nIt used the casbin config from `examples` folder, and you can find this demo in `demo` folder.\n\nYou can also view the unit tests to understand this middleware.\n\nBesides, there is another example for `CasbinMiddleware` which is designed to work with JWT authentication. You can find\nit in `demo/jwt_test.py`.\n\n## Development\n\n### Run unit tests\n\n1. Fork/Clone repository\n2. Install fastapi-casbin-auth dependencies, and run `pytest`\n\n```bash\npip install -r dev_requirements.txt\npip install -r requirements.txt\npytest\n```\n\n### Update requirements with pip-tools\n\n```bash\n# update requirements.txt\npip-compile --no-annotate --no-header --rebuild requirements.in\n# sync venv\npip-sync\n```\n\n### Manually Bump Version\n\n```\nbumpversion major # major release\nor\nbumpversion minor # minor release\nor\nbumpversion patch # hotfix release\n```\n\n## Documentation\n\nThe authorization determines a request based on ``{subject, object, action}``, which means what ``subject`` can perform\nwhat ``action`` on what ``object``. In this plugin, the meanings are:\n\n1. ``subject``: the logged-in user name\n2. ``object``: the URL path for the web resource like `dataset1/item1`\n3. ``action``: HTTP method like GET, POST, PUT, DELETE, or the high-level actions you defined like \"read-file\", \"\n write-blog\" (currently no official support in this middleware)\n\nFor how to write authorization policy and other details, please refer\nto [the Casbin's documentation](https://casbin.org).\n\n## Getting Help\n\n- [Casbin](https://casbin.org)\n\n## License\n\nThis project is under Apache 2.0 License. See the [LICENSE](LICENSE) file for the full license text.\n",
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