generic-session
Generic session middleware for koa, easy use with custom stores such as redis or mongo, supports defer session getter.
This middleware will only set a cookie when a session is manually set. Each time the session is modified (and only when the session is modified), it will reset the cookie and session.
You can use the rolling sessions that will reset the cookie and session for every request which touch the session. Save behavior can be overridden per request.
For async/await and Node v6.9.0+ support use v2.x of this package, for older use v1.x
Usage
Example
var session = require('koa-generic-session');
var redisStore = require('koa-redis');
var koa = require('koa');
var app = new koa(); // for koa v1 use `var app = koa();`
app.keys = ['keys', 'keykeys'];
app.use(session({
store: redisStore()
}));
app.use(function *() {
switch (this.path) {
case '/get':
get.call(this);
break;
case '/remove':
remove.call(this);
break;
case '/regenerate':
yield regenerate.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;
}
function *regenerate() {
get.call(this);
yield this.regenerateSession();
get.call(this);
}
app.listen(8080);
- After adding session middleware, you can use
this.session
to set or get the sessions. - Getting session ID via
this.sessionId
. - Setting
this.session = null;
will destroy this session. - Altering
this.session.cookie
changes the cookie options of this user. Also you can use the cookie options in session the store. Use for examplecookie.maxAge
as the session store's ttl. - Calling
this.regenerateSession
will destroy any existing session and generate a new, empty one in its place. The new session will have a different ID. - Calling
this.saveSession
will save an existing session (this method was added for koa-redirect-loop) - Setting
this.sessionSave = true
will force saving the session regardless of any other options or conditions. - Setting
this.sessionSave = false
will prevent saving the session regardless of any other options or conditions.
Options
-
key
: cookie name defaulting tokoa.sid
. -
prefix
: session prefix for store, defaulting tokoa:sess:
. -
ttl
: ttl is for sessionStore's expiration time. it is different withcookie.maxAge
, default to null(means get ttl fromcookie.maxAge
). -
rolling
: rolling session, always reset the cookie and sessions, defaults tofalse
. -
genSid
: default sid was generated by uid2, you can pass a function to replace it (supports promises/async functions). -
defer
: defers get session, only generate a session when you use it throughvar session = yield this.session;
, defaults tofalse
. -
allowEmpty
: allow generation of empty sessions. -
errorHandler(err, type, ctx)
:Store.get
andStore.set
will throw in some situation, useerrorHandle
to handle these errors by yourself. Default will throw. -
reconnectTimeout
: When store is disconnected, don't throwstore unavailable
error immediately, waitreconnectTimeout
to reconnect, default is10s
. -
sessionIdStore
: object with get, set, reset methods for passing session id throw requests. -
valid
: valid(ctx, session), valid session value before use it. -
beforeSave
: beforeSave(ctx, session), hook before save session. -
store
: session store instance. It can be any Object that has the methodsset
,get
,destroy
like MemoryStore. -
cookie
: session cookie settings, defaulting to:{ path: '/', httpOnly: true, maxAge: 24 * 60 * 60 * 1000 //one day in ms, overwrite: true, signed: true }
For a full list of cookie options see expressjs/cookies.
if you set
cookie.maxAge
tonull
, meaning no "expires" parameter is set so the cookie becomes a browser-session cookie. When the user closes the browser the cookie (and session) will be removed.Notice that
ttl
is different fromcookie.maxAge
,ttl
set the expire time of sessionStore. So if you setcookie.maxAge = null
, andttl=ms('1d')
, the session will expired after one day, but the cookie will destroy when the user closes the browser. And mostly you can just ignoreoptions.ttl
,koa-generic-session
will parsecookie.maxAge
as the tll.
Hooks
valid()
: valid session value before use itbeforeSave()
: hook before save session
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 sidset(sid, sess, ttl)
: set session object for sid, with a ttl (in ms)destroy(sid)
: destroy 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.
- koa-pg-session to store your session data with PostgreSQL.
- koa-generic-session-rethinkdb to store your session data with ReThinkDB.
- koa-sqlite3-session to store your session data with SQLite3.
- koa-generic-session-sequelize to store your session data with the Sequelize ORM.
- koa-generic-session-knex to store your session data with the Knex query builder.
Graceful shutdown
Since this middleware comes with an auto-reconnect feature, it's very likely you can't gracefully shutdown after closing the client as generic-session will try to recover the connection, in those cases you can disable reconnect feature (https://github.com/koajs/generic-session/blob/49b45612877d1a1b8a42dc61bfeba46b71f9cb52/src/session.js#L103-L112) desactivating the client emitter (do this only when stopping the server)
Example with ioredis
// ...disconnecting from db
redisClient.emit = () => true;
await redisClient.quit();
// ...stopping the server
Licences
(The MIT License)
Copyright (c) 2013 - 2016 dead-horse and other contributors
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.