SwapBooks backend setup

User login with react-redux frontend

Backend

npm install --save

1. passport
2. passport-local
3. bcrypt-node.js For some reason bcrypt doesn't hash
4. crypto
5. mongoose
6. connect-mongo
7. express-session

Folder > Files

1. config > passport.js (set up authentication strategies here - localStrategy will use comparePassword method defined in User.js)
2. routes > auth.js (http requests GET, POST for login and signup)
3. models > User.js (include at least email and password)

app.js

1. import passport from 'passport'
2. import auth from './routes/auth'
3. 'const passportConfig = require('./config/passport')
4. app.use(passport.initialize())
5. app.use(passport.session()) This is invoked on every http request. It will check whether there is an authenticated user object in req.session.passport.user loaded by passport.serializeUser(). If there is, load additional user information to req.user via passport.deserializeUser() in passport.js
6. app.use('/auth', auth) This makes the authentication routes available to app

auth.js

1. To sign up a new user, the route is: router.post('/signup', function(req, res, next) { User.findOne(..
   1.1 In Login.js, in this.state, email, username and password keys are updated on input entry.
   1.2 On ajax call, find existing user using req.body.email or req.body.username, if not create new User() and populate with req.body attributes
   1.3 Invoke req.logIn which updates req.session.passport.user via passport.serializeUser()

2. To login an existing user, the route is: router.post('/login', function(req, res, next) { passport.authenticate('local', function(error, user, info) {..
   2.1 In Login.js, in this.state, email, username and password keys are updated on input entry.
   2.2 On ajax call, use passport.js strategy local to authenticate user. If password matches, invoke req.logIn which updates req.session.passport.user via passport.serializeUser()

Frontend

index.js

1. store.dispatch(getUser()) is the function that updates state.user in the global app state. It dispatches the getUser() action which fires the ajax GET request /auth/user. If user is authenticated, it returns req.user which has been populated by passport.deserializeUser()

App.js

1. state.user is exposed via mapStatetoProps as this.props.user. If exists, isLoggedIn is updated and <Secret/> component is loaded. Else, <Login/> component is loaded.