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casbin-egg-authz

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egg-authz is an authorization middleware for Egg.js based on Casbin

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Egg-Authz 
====
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Egg-Authz is an authorization middleware for [Egg](https://eggjs.org/), it's based on ``Node-Casbin``: [https://github.com/casbin/node-casbin](https://github.com/casbin/node-casbin).

## 1. Installation
### use casbin v2.x
```shell
npm install casbin@2 egg-authz@2 --save
```

### use casbin v3.x
```shell
npm install casbin@3 egg-authz@3 --save
```

## 2. Create a file in middleware directory to import the module.

```js
// app/middleware/authz.js
module.exports = require('egg-authz')
```

```js
// config/config.default.js
const casbin = require('casbin')
module.exports = {
  middleware: [ 'authz' ],
  authz: {
    enable: true,
    newEnforcer: async() => {
      // load the casbin model and policy from files, database is also supported.
      const enforcer = await casbin.newEnforcer('authz_model.conf', 'authz_policy.csv')
      return enforcer
    }
  }
}
```

## 3. Enable the middleware in your config files.

## How to control the access

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-on 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](https://casbin.org).

## Getting Help

- [Node-Casbin](https://github.com/casbin/node-casbin)

## License

This project is licensed under the [Apache 2.0 license](LICENSE).

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