koa, sessions, redis: how to make it work? - session

Question

I am trying to implement Firebase authentication with server-side sessions using koa, koa-session, koa-redis.
I just can't grasp it. When reading the koa-session readme, this is particularly cryptic to me (link):
You can store the session content in external stores (Redis, MongoDB or other DBs) by passing options.store with three methods (these need to be async functions):
get(key, maxAge, { rolling }): get session object by key
set(key, sess, maxAge, { rolling, changed }): set session object for key, with a maxAge (in ms)
destroy(key): destroy session for key
After asking around, I did this:
// middleware/installSession.js
const session = require('koa-session');
const RedisStore = require('koa-redis');
const ONE_DAY = 1000 * 60 * 60 * 24;
module.exports = function installSession(app) {
app.keys = [process.env.SECRET];
app.use(session({
store: new RedisStore({
url: process.env.REDIS_URL,
key: process.env.REDIS_STORE_KEY,
async get(key) {
const res = await redis.get(key);
if (!res) return null;
return JSON.parse(res);
},
async set(key, value, maxAge) {
maxAge = typeof maxAge === 'number' ? maxAge : ONE_DAY;
value = JSON.stringify(value);
await redis.set(key, value, 'PX', maxAge);
},
async destroy(key) {
await redis.del(key);
},
})
}, app));
};
Then in my main server.js file:
// server.js
...
const middleware = require('./middleware');
const app = new Koa();
const server = http.createServer(app.callback());
// session middleware
middleware.installSession(app);
// other middleware, which also get app as a parameter
middleware.installFirebaseAuth(app);
...
const PORT = parseInt(process.env.PORT, 10) || 3000;
server.listen(PORT);
console.log(`Listening on port ${PORT}`);
But then how do I access the session and its methods from inside other middlewares? Like in the installFirebaseAuth middleware, I want to finally get/set session values:
// installFirebaseAuth.js
...
module.exports = function installFirebaseAuth(app) {
...
const verifyAccessToken = async (ctx, next) => {
...
// trying to access the session, none work
console.log('ctx.session', ctx.session);
console.log('ctx.session.get():'
ctx.session.get(process.env.REDIS_STORE_KEY));
console.log('ctx.req.session', ctx.req.session);
const redisValue = await ctx.req.session.get(process.env.REDIS_STORE_KEY);
...
}
}
ctx.session returns {}
ctx.session.get() returns ctx.session.get is not a function
ctx.req.session returns undefined
Any clues?
Thanks!!

Answer 1

It works in my case, hope it helps you
const Koa = require('koa')
const app = new Koa()
const Router = require('koa-router')
const router = new Router()
const static = require('koa-static')
const session = require('koa-session')
// const ioredis = require('ioredis')
// const redisStore = new ioredis()
const redisStore = require('koa-redis')
const bodyparser = require('koa-bodyparser')
app.use(static('.'))
app.use(bodyparser())
app.keys = ['ohkeydoekey']
app.use(session({
key: 'yokiijay:sess',
maxAge: 1000*20,
store: redisStore()
}, app))
app.use(router.routes(), router.allowedMethods())
router.post('/login', async ctx=>{
const {username} = ctx.request.body
if(username == 'yokiijay'){
ctx.session.user = username
const count = ctx.session.count || 0
ctx.session.code = count
ctx.body = `wellcome ${username} logged in`
}else {
ctx.body = `sorry, you can't login`
}
})
router.get('/iflogin', async ctx=>{
if(ctx.session.user){
ctx.body = ctx.session
}else {
ctx.body = 'you need login'
}
})
app.listen(3000, ()=>{
console.log( 'app running' )
})