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Use Casbin in Flask, Casbin is a powerful and efficient open-source access control library.
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flask-casbin is an authorization middleware for Flask, it's based on PyCasbin.


pip install flask-casbin

Simple Example

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

  • Add the middleware to your Django app's
from flask import Flask
from casbin_middleware.middleware import CasbinMiddleware

app = Flask(__name__)
app.wsgi_app = CasbinMiddleware(app.wsgi_app) # Add this line, must after Authentication.
  • Copy casbin_middleware folder to your Flask app's top folder, modify casbin_middleware/ if you need:
import casbin

    def __init__(self, app): = app
        # 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.remote_user
        if user is None:
            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.


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


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

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