pycasbin / django-casbin

Authorization middleware for Django based on PyCasbin

django-casbin

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django-casbin is an authorization middleware for Django, it's based on PyCasbin.

Installation

pip install casbin

Simple Example

This repo is just a working Django app that shows the usage of django-casbin. To use it in your existing Django app, you need:

• Add the middleware to your Django app's settings.py:

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'casbin_middleware.middleware.CasbinMiddleware', # Add this line, must after AuthenticationMiddleware.
]

• Copy casbin_middleware folder to your Django's top folder, modify casbin_middleware/middleware.py if you need:

import casbin

def __init__(self, get_response):
    self.get_response = get_response
    # load the casbin model and policy from files.
    # change the 2nd arg to use a database.
    self.enforcer = casbin.Enforcer("casbin_middleware/authz_model.conf", "casbin_middleware/authz_policy.csv")

def check_permission(self, request):
    # change the user, path, method as you need.
    user = request.user.username
    if request.user.is_anonymous:
        user = 'anonymous'
    path = request.path
    method = request.method
    return self.enforcer.enforce(user, path, method)

• The default policy authz_policy.csv is:

p, anonymous, /, GET
p, admin, *, *
g, alice, admin

It means anonymous user can only access homepage /. Admin users like alice can access any pages. Currently all accesses are regarded as anonymous. Add your authentication to let a user log in.

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"

For how to write authorization policy and other details, please refer to the Casbin's documentation.

Getting Help

• Casbin

License

This project is under Apache 2.0 License. See the LICENSE file for the full license text.