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next.js/examples/with-firebase/pages/index.js

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import React, { Component } from 'react'
import firebase from 'firebase'
import 'isomorphic-fetch'
import clientCredentials from '../credentials/client'
export default class Index extends Component {
static async getInitialProps ({req, query}) {
const user = req && req.session ? req.session.decodedToken : null
const snap = await req.firebaseServer.database().ref('messages').once('value')
return { user, messages: snap.val() }
}
constructor (props) {
super(props)
this.state = {
user: this.props.user,
value: '',
messages: this.props.messages
}
this.addDbListener = this.addDbListener.bind(this)
this.handleChange = this.handleChange.bind(this)
this.handleSubmit = this.handleSubmit.bind(this)
}
componentDidMount () {
firebase.initializeApp(clientCredentials)
if (this.state.user) this.addDbListener()
firebase.auth().onAuthStateChanged(user => {
if (user) {
this.setState({ user: user })
return user.getToken()
.then((token) => {
// eslint-disable-next-line no-undef
return fetch('/api/login', {
method: 'POST',
// eslint-disable-next-line no-undef
headers: new Headers({ 'Content-Type': 'application/json' }),
credentials: 'same-origin',
body: JSON.stringify({ token })
})
}).then((res) => this.addDbListener())
} else {
this.setState({ user: null })
// eslint-disable-next-line no-undef
fetch('/api/logout', {
method: 'POST',
credentials: 'same-origin'
}).then(() => firebase.database().ref('messages').off())
}
})
}
addDbListener () {
firebase.database().ref('messages').on('value', snap => {
const messages = snap.val()
if (messages) this.setState({ messages })
})
}
handleChange (event) {
this.setState({ value: event.target.value })
}
handleSubmit (event) {
event.preventDefault()
const date = new Date().getTime()
firebase.database().ref(`messages/${date}`).set({
id: date,
text: this.state.value
})
this.setState({ value: '' })
}
handleLogin () {
firebase.auth().signInWithPopup(new firebase.auth.GoogleAuthProvider())
}
handleLogout () {
firebase.auth().signOut()
}
render () {
const { user, value, messages } = this.state
return <div>
{
user
? <button onClick={this.handleLogout}>Logout</button>
: <button onClick={this.handleLogin}>Login</button>
}
{
user &&
<div>
<form onSubmit={this.handleSubmit}>
<input
type={'text'}
onChange={this.handleChange}
placeholder={'add message'}
value={value}
/>
</form>
<ul>
{
messages &&
Object.keys(messages).map(key => <li key={key}>{messages[key].text}</li>)
}
</ul>
</div>
}
</div>
}
}