# egg-session
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[![NPM version][npm-image]][npm-url]
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[![build status][travis-image]][travis-url]
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[![Test coverage][codecov-image]][codecov-url]
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[![David deps][david-image]][david-url]
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[![Known Vulnerabilities][snyk-image]][snyk-url]
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[![npm download][download-image]][download-url]
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[npm-image]: https://img.shields.io/npm/v/egg-session.svg?style=flat-square
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[npm-url]: https://npmjs.org/package/egg-session
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[travis-image]: https://img.shields.io/travis/eggjs/egg-session.svg?style=flat-square
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[travis-url]: https://travis-ci.org/eggjs/egg-session
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[codecov-image]: https://codecov.io/github/eggjs/egg-session/coverage.svg?branch=master
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[codecov-url]: https://codecov.io/github/eggjs/egg-session?branch=master
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[david-image]: https://img.shields.io/david/eggjs/egg-session.svg?style=flat-square
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[david-url]: https://david-dm.org/eggjs/egg-session
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[snyk-image]: https://snyk.io/test/npm/egg-session/badge.svg?style=flat-square
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[snyk-url]: https://snyk.io/test/npm/egg-session
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[download-image]: https://img.shields.io/npm/dm/egg-session.svg?style=flat-square
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[download-url]: https://npmjs.org/package/egg-session
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Session plugin for egg, based on [koa-session](https://github.com/koajs/session).
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## Install
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```bash
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$ npm i egg-session --save
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```
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## Usage
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egg-session is a built-in plugin in egg and enabled by default.
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```js
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// {app_root}/config/plugin.js
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exports.session = true; // enable by default
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```
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### External Store
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egg-session support external store, you can store your sessions in redis, memcached or other databases.
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For example, if you want to store session in redis, you must:
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1. Dependent [egg-redis](https://github.com/eggjs/egg-redis)
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```bash
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npm i --save egg-redis
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```
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2. Import egg-redis as a plugin and set the configuration
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```js
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// config/plugin.js
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exports.redis = {
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enable: true,
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package: 'egg-redis',
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};
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```
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```js
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// config/config.default.js
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exports.redis = {
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// your redis configurations
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};
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```
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3. Implement a session store with redis
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```js
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// app.js
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module.exports = app => {
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// set redis session store
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// session store must have 3 methods
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// define sessionStore in `app.js` so you can access `app.redis`
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app.sessionStore = {
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async get(key) {
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const res = await app.redis.get(key);
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if (!res) return null;
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return JSON.parse(res);
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},
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async set(key, value, maxAge) {
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// maxAge not present means session cookies
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// we can't exactly know the maxAge and just set an appropriate value like one day
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if (!maxAge) maxAge = 24 * 60 * 60 * 1000;
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value = JSON.stringify(value);
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await app.redis.set(key, value, 'PX', maxAge);
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},
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async destroy(key) {
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await app.redis.del(key);
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},
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};
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// session store can be a session store class
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// app.sessionStore = class Store {
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// constructor(app) {
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// this.app = app;
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// }
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// async get() {}
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// async set() {}
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// async destroy() {}
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// };
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};
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```
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Once you use external session store, session is strong dependent on your external store, you can't access session if your external store is down. **Use external session stores only if necessary, avoid use session as a cache, keep session lean and stored by cookie!**
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## Configuration
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Support all configurations in [koa-session](https://github.com/koajs/session).
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[View the default configurations](https://github.com/eggjs/egg-session/blob/master/config/config.default.js)
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## Questions & Suggestions
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Please open an issue [here](https://github.com/eggjs/egg/issues).
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## License
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[MIT](https://github.com/eggjs/egg-session/blob/master/LICENSE)
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