koa-header-session

Header session middleware for koa, easy to use with custom stores such as redis or mongo, supports defer session getter. based on koa-generic-session(it is a header based session).

This middleware will only set a header when a session is manually set. Each time the session is modified (and only when the is session modified), it will reset the header and session.

You can use the rolling sessions that will reset the header and session for every request which touch the session.

Usage

Example

var session = require('koa-header-session');
var redisStore = require('koa-redis');
var koa = require('koa');

var app = koa();
app.use(session({
  store: redisStore()
}));

app.use(function *() {
  switch (this.path) {
  case '/get':
    get.call(this);
    break;
  case '/remove':
    remove.call(this);
    break;
  }
});

function get() {
  var session = this.session;
  session.count = session.count || 0;
  session.count++;
  this.body = session.count;
}

function remove() {
  this.session = null;
  this.body = 0;
}

app.listen(8080);

After adding session middleware, you can use this.session to set or get the sessions.
Setting this.session = null; will destroy this session.

Options

header: HTTP header used for session ids, defaulting to X-Session-ID
path: Allowed path for sessions, defaulting to /
prefix: session prefix for store, defaulting to koa:sess:
store: session store instance
ttl: ttl is for sessionStore's expiration time. it is different with cookie.maxage, default to null(means get ttl from cookie.maxage).
rolling: rolling session, always reset the cookie and sessions, defaults to false
genSid: default sid was generated by uid2, you can pass a function to replace it
defer: defers get session, only generate a session when you use it through var session = yield this.session;, defaults to false
allowEmpty: allow generation of empty sessions
errorHandler(err, type, ctx): Store.get and Store.set will throw in some situation, use errorHandle to handle these errors by yourself. Default will throw.
Store can be any Object that has the methods set, get, destroy like MemoryStore.

Session Store

You can use any other store to replace the default MemoryStore, it just needs to follow this api:

get(sid): get session object by sid
set(sid, sess, ttl): set session object for sid, with a ttl (in ms)
destroy(sid): destory session for sid

the api needs to return a Promise, Thunk or generator.

And use these events to report the store's status.

connect
disconnect

Stores Presented

koa-redis to store your session data with redis.
koa-mysql-session to store your session data with MySQL.
koa-generic-session-mongo to store your session data with MongoDB.

Licences

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.