Casbin.js

Casbin.js is a frontend port of a backend Casbin service, which facilitates the manipulation, management and storage of the user permission in a frontend application.

Example

We demonstrate the usage of Casbin.js with a React app. View the code to see more details.

You can use manual mode in Casbin.js, and set the permission whenever you wish.

const casbinjs = require('casbin.js');

// Set the user's permission:
// He/She can read 2 objects: data1 and data2
// Can write 1 objects: data1
const permission = {
    "read": ['data1', 'data2'],
    "write": ['data1']
}

// Run casbin.js in manual mode, which requires you to set the permission manually.
const authorizer = new casbinjs.Authorizer("manual");

authorizer.setPermission(permission);

authorizer.can("read", "data1").then(result => {
  console.log(result)
})
authorizer.cannot("write", "data2").then(result => {
  console.log(result)
});

You can also use the auto mode. In details, specify a casbin backend service endpoint when initializing the Casbin.js authorizer, and set the subject when the frontend user identity changes. Casbin.js will automatically fetch the permission from the endpoint. (A pre-configurated casbin service API is required at the backend.)

const casbinjs = require('casbin.js');

// Set your backend casbin service url
const authorizer = new casbinjs.Authorizer('auto', {endpoint: 'http://Domain_name/casbin/api'});

// When the identity shifts, reset the user. Casbin.js will automatically fetch the permission from the endpoint.
await authorizer.setUser("Tom");

// Evaluate the permission
authorizer.can("read", "data1").then();

More functionalities of Casbin.js are still under development. Feel free to raise issues to share your features suggestions!

TODO MAP

• [x] Permission cache.
• [ ] Cookie mode.
• [ ] Lightweight enforcer (avoid the abuse of async functions).
• [ ] Integration with other modern frontend frameworks.