sample_express_and_express-session_with_adapter.js

const express = require('express')
const expressSession = require('express-session')
const app = express()


const user1 = {
    name: 'Marcos Soares',
    age: 29
}

const user2 = {
    name: 'Manuel Gomes',
    age: 51
}

const oneMinute = 60000

// app.use(express.json())
app.use(expressSession({
    secret: 'any_secret',
    cookie: { maxAge: oneMinute }
}))

const expressAdapter = (controller) => {
    return async (req, res) => {
        const data = {
            ...req.query,
            ...req.body,
            ...req.params,
            session: {
                get (key) {
                    return req.session[key] || null
                },
                set (key, value) {
                    req.session[key] = value
                },
                append (key, value) {
                    if (!req.session[key]) {
                        req.session[key] = value
                    }else {
                        if (typeof value !== 'object') {
                            throw new Error(`expects a object, given a ${typeof value}`)
                        }
                        req.session[key] = { ...req.session[key], ...value}
                    }
                }
            }
        }

        const result = await controller(data)

       res.status(200).json(result)
    }
}

const auth = async (request) => {
    const { password } = request
    return new Promise((resolve, rejected) => {
        setTimeout(() => {
            if (password === '1234') {
                request.session.set('user', user1)
            }else {
                request.session.set('user', user2)
            }
            return resolve({
                auth: true
            })
        }, 1000)
    })
}

const getUserFromSession = async (request) => {
    return new Promise((resolve, rejected) => {
        setTimeout(() => {
            return resolve({
                user: request.session.get('user')
            })
        }, 1000)
    })
}

const setUserEmail = async (request) => {

    const { email } = request

    if (!email) {
        return {
            error: 'email is not provided'
        }
    }

    if (!request.session.get('user')) {
        return {
            error: 'you are not auth'
        }
    }

    return new Promise((resolve, rejected) => {
        setTimeout(() => {
            request.session.append('user', { email })
            resolve({
                emailSet: true
            })
        }, 3000)
    })
}

app.get('/auth', expressAdapter(auth))

app.get('/user', expressAdapter(getUserFromSession))

app.get('/user/email', expressAdapter(setUserEmail))

app.listen(4040, () => {
    console.log('listen on 4040')
})