راستی آزمایی ایمیل (Email Confirmation) با React – راهنمای کاربردی

1import React, { Component } from 'react'
2import { BrowserRouter, Route, Redirect, Switch } from 'react-router-dom'
3import Notifications from 'react-notify-toast'
4import 'react-toastify/dist/ReactToastify.css'
5
6import Landing from './components/Landing'
7import Confirm from './components/Confirm'
8import Spinner from './components/Spinner'
9import Footer from './components/Footer/Footer'
10import { API_URL } from './config'
11import './App.css'
12
13export default class App extends Component {
14  
15  // A bit of state to make sure the server is up and running before the user 
16  // can interact with the app.
17  state = {
18    loading: true
19  }
20
21  // When the component mounts, a simple GET request is made to 'wake up' the 
22  // server. A lot of free services like Heroku and Now.sh will put your server 
23  // to sleep if no one has used your application in a few minutes. Using a 
24  // service like uptimerobot.com to ping the server regularly can mitigate 
25  // sleepiness.
26  componentDidMount = () => {
27    fetch(`${API_URL}/wake-up`)
28      .then(res => res.json())
29      .then(() => {
30        this.setState({ loading: false })
31      })
32      .catch(err => console.log(err))
33  }
34
35  // You are probaly used to seeing React 'render()' methods written like this:
36  //
37  // render() {
38  //   return (
39  //     <Some jsx />
40  //   )
41  // }
42  //
43  // Below is a version of writing a 'render()' that also works. The 'why does 
44  // it work?' is related to the 'this' keyword in JavaScript and is beyond the 
45  // scope of this post.  
46  
47  render = () => {
48    
49    // The 'content' function determines what to show the user based on whether 
50    // the server is awake or not.
51    const content = () => {
52      
53      // The server is still asleep, so provide a visual cue with the <Spinner /> 
54      // component to give the user that feedback.
55      if (this.state.loading) {
56        return <Spinner size='8x' spinning='spinning' />
57      }
58
59      // The server is awake! React Router is used to either show the 
60      // <Landing /> component where the emails are collected or the <Confirm /> 
61      // component where the emails are confirmed.
62      return (
63        <BrowserRouter>  
64          <Switch>
65            {/* 
66              the ':id' in this route will be the unique id the database 
67              creates and is available on 'this.props' inside the <Confirm />
68              component at this.props.match.params.id 
69            */}
70            <Route exact path='/confirm/:id' component={Confirm} />
71            <Route exact path='/' component={Landing} />
72            <Redirect from='*' to='/'/>
73          </Switch>
74        </BrowserRouter>
75      )
76    }
77
78    return (
79      // The 'container' class uses flexbox to position and center its three 
80      // children: <Notifications />, <main> and <Footer /> 
81      <div className='container fadein'>
82        {/* 
83          <Notifications > component from 'react-notify-toast' This is the 
84          placeholder on the dom that will hold all the feedback toast messages 
85          whenever notify.show('My Message!') is called.
86        */}
87        <Notifications />
88        <main>
89          {content()}
90        </main>
91        {/* 
92          For every Medium post I write I include a demo app that uses the same 
93          footer. So, I have abstracted that out to use on future posts with 
94          just a couple of props passed in.
95        */}
96        <Footer
97          mediumId={'257e5d9de725'}
98          githubRepo={'react-confirm-email'}
99        />
100      </div>
101    )
102  }
103}

1import React, { Component } from 'react'
2import { notify } from 'react-notify-toast'
3import Spinner from './Spinner'
4import { API_URL } from '../config'
5
6export default class Landing extends Component {
7
8  // A bit of state to give the user feedback while their email address is being 
9  // added to the User model on the server.
10  state = {
11    sendingEmail: false
12  }
13
14  onSubmit = event => {
15    event.preventDefault()
16    this.setState({ sendingEmail: true})
17
18    // Super interesting to me that you can mess with the upper and lower case 
19    // of the headers on the fetch call and the world does not explode.
20    fetch(`${API_URL}/email`, {
21      method: 'pOSt',
22      headers: {
23        aCcePt: 'aPpliCaTIon/JsOn', 
24        'cOntENt-type': 'applicAtion/JSoN'
25      },
26      body: JSON.stringify({ email: this.email.value })
27    })
28    .then(res => res.json())  
29    .then(data => {
30      
31      // Everything has come back successfully, time to update the state to 
32      // reenable the button and stop the <Spinner>. Also, show a toast with a 
33      // message from the server to give the user feedback and reset the form 
34      // so the user can start over if she chooses.
35      this.setState({ sendingEmail: false})
36      notify.show(data.msg)
37      this.form.reset()
38    })
39    .catch(err => console.log(err))
40  }
41
42  render = () => {
43
44    // This bit of state provides user feedback in the component when something
45    // changes. sendingEmail is flipped just before the fetch request is sent in 
46    // onSubmit and then flipped back when data has been received from the server.
47    // How many times is the 'sendingEmail' variable used below?
48    const { sendingEmail } = this.state
49
50    return (
51      // A ref is put on the form so that it can be reset once the submission
52      // process is complete.
53      <form 
54        onSubmit={this.onSubmit} 
55        ref={form => this.form = form}
56      >
57        <div>
58          <input 
59            type='email'
60            name='email' 
61            ref={input => this.email = input}
62            required 
63          />
64          {/* 
65            Putting the label after the input allows for that neat transition
66            effect on the label when the input is focused.
67          */}
68          <label htmlFor='email'>email</label>
69        </div>
70        <div>
71          {/* 
72            While the email is being sent from the server, provide feedback that
73            something is happening by disabling the button and showing a 
74            <Spinner /> inside the button with a smaller 'size' prop passed in.
75          */}
76          <button type='submit' className='btn' disabled={sendingEmail}>
77            {sendingEmail 
78              ? <Spinner size='lg' spinning='spinning' /> 
79              : "Let's Go!"
80            }
81          </button>
82        </div>
83      </form>
84    )
85  }
86}

1import React, {Component} from 'react'
2import { Link } from 'react-router-dom'
3import { notify } from 'react-notify-toast'
4import Spinner from './Spinner'
5import { API_URL } from '../config'
6
7export default class Confirm extends Component {
8  
9  // A bit of state to give the user feedback while their email
10  // address is being confirmed on the User model on the server.
11  state = {
12    confirming: true
13  }
14
15  // When the component mounts the mongo id for the user is pulled  from the 
16  // params in React Router. This id is then sent to the server to confirm that 
17  // the user has clicked on the link in the email. The link in the email will 
18  // look something like this: 
19  // 
20  // http://localhost:3000/confirm/5c40d7607d259400989a9d42
21  // 
22  // where 5c40d...a9d42 is the unique id created by Mongo
23  componentDidMount = () => {
24    const { id } = this.props.match.params
25
26    fetch(`${API_URL}/email/confirm/${id}`)
27      .then(res => res.json())
28      .then(data => {
29        this.setState({ confirming: false })
30        notify.show(data.msg)
31      })
32      .catch(err => console.log(err))
33  }
34
35  // While the email address is being confirmed on the server a spinner is 
36  // shown that gives visual feedback. Once the email has been confirmed the 
37  // spinner is stopped and turned into a button that takes the user back to the 
38  // <Landing > component so they can confirm another email address.
39  render = () =>
40    <div className='confirm'>
41      {this.state.confirming
42        ? <Spinner size='8x' spinning={'spinning'} /> 
43        : <Link to='/'>
44            <Spinner size='8x' spinning={''} /> 
45          </Link>
46      }
47    </div>
48}

1import React from 'react'
2import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
3import { faSync } from '@fortawesome/free-solid-svg-icons'
4
5export default props =>
6  <div className={`fadeIn ${props.spinning}`}>
7    <FontAwesomeIcon icon={faSync} size={props.size} />
8  </div>

1const mongoose = require('mongoose')
2const Schema = mongoose.Schema
3
4// Data we need to collect/confirm to have the app go.
5const fields = {
6  email: {
7    type: String
8  },
9  confirmed: {
10    type: Boolean,
11    default: false
12  }
13}
14
15// One nice, clean line to create the Schema.
16const userSchema = new Schema(fields)
17
18module.exports = mongoose.model('User', userSchema)

1require('dotenv').config()
2const express = require('express')
3const mongoose = require('mongoose')
4const cors = require('cors')
5
6const app = express()
7const emailController = require('./email/email.controller')
8const { PORT, CLIENT_ORIGIN, DB_URL } = require('./config')
9
10// Only allow requests from our client
11app.use(cors({
12  origin: CLIENT_ORIGIN
13}))
14
15// Allow the app to accept JSON on req.body
16app.use(express.json())
17
18// This endpoint is pinged every 5 mins by uptimerobot.com to prevent 
19// free services like Heroku and Now.sh from letting the app go to sleep.
20// This endpoint is also pinged every time the client starts in the 
21// componentDidMount of App.js. Once the app is confirmed to be up, we allow 
22// the user to perform actions on the client.
23app.get('/wake-up', (req, res) => res.json('?'))
24
25// This is the endpoint that is hit from the onSubmit handler in Landing.js
26// The callback is shelled off to a controller file to keep this file light.
27app.post('/email', emailController.collectEmail)
28
29// Same as above, but this is the endpoint pinged in the componentDidMount of 
30// Confirm.js on the client.
31app.get('/email/confirm/:id', emailController.confirmEmail)
32
33// Catch all to handle all other requests that come into the app. 
34app.use('*', (req, res) => {
35  res.status(404).json({ msg: 'Not Found' })
36})
37
38// To get rid of all those semi-annoying Mongoose deprecation warnings.
39const options = {
40  useCreateIndex: true,
41  useNewUrlParser: true,
42  useFindAndModify: false
43}
44
45// Connecting the database and then starting the app.
46mongoose.connect(DB_URL, options, () => {
47  app.listen(PORT, () => console.log('?'))
48})
49// The most likely reason connecting the database would error out is because 
50// Mongo has not been started in a separate terminal.
51.catch(err => console.log(err))

1const User = require('../user.model')
2const sendEmail = require('./email.send')
3const msgs = require('./email.msgs')
4const templates = require('./email.templates')
5
6// The callback that is invoked when the user submits the form on the client.
7exports.collectEmail = (req, res) => {
8  const { email } = req.body
9  
10  User.findOne({ email })
11    .then(user => {
12      
13      // We have a new user! Send them a confirmation email.
14      if (!user) {
15        User.create({ email })
16          .then(newUser => sendEmail(newUser.email, templates.confirm(newUser._id)))
17          .then(() => res.json({ msg: msgs.confirm }))
18          .catch(err => console.log(err))
19      }
20
21      // We have already seen this email address. But the user has not
22      // clicked on the confirmation link. Send another confirmation email.
23      else if (user && !user.confirmed) {
24        sendEmail(user.email, templates.confirm(user._id))
25          .then(() => res.json({ msg: msgs.resend }))
26      }
27
28      // The user has already confirmed this email address
29      else {
30        res.json({ msg: msgs.alreadyConfirmed })
31      }
32
33    })
34    .catch(err => console.log(err))
35}
36
37// The callback that is invoked when the user visits the confirmation
38// url on the client and a fetch request is sent in componentDidMount.
39exports.confirmEmail = (req, res) => {
40  const { id } = req.params
41
42  User.findById(id)
43    .then(user => {
44
45      // A user with that id does not exist in the DB. Perhaps some tricky 
46      // user tried to go to a different url than the one provided in the 
47      // confirmation email.
48      if (!user) {
49        res.json({ msg: msgs.couldNotFind })
50      }
51      
52      // The user exists but has not been confirmed. We need to confirm this 
53      // user and let them know their email address has been confirmed.
54      else if (user && !user.confirmed) {
55        User.findByIdAndUpdate(id, { confirmed: true })
56          .then(() => res.json({ msg: msgs.confirmed }))
57          .catch(err => console.log(err))
58      }
59
60      // The user has already confirmed this email address.
61      else  {
62        res.json({ msg: msgs.alreadyConfirmed })
63      }
64
65    })
66    .catch(err => console.log(err))
67}

1module.exports = {
2  confirm: 'Email sent, please check your inbox to confirm',
3  confirmed: 'Your email is confirmed!',
4  resend: 'Confirmation email resent, maybe check your spam?',
5  couldNotFind: 'Could not find you!',
6  alreadyConfirmed: 'Your email was already confirmed'
7}

1const nodemailer = require('nodemailer')
2
3// The credentials for the email account you want to send mail from. 
4const credentials = {
5  host: 'smtp.gmail.com',
6  port: 465,
7  secure: true,
8  auth: {
9    // These environment variables will be pulled from the .env file
10    user: process.env.MAIL_USER, 
11    pass: process.env.MAIL_PASS  
12  }
13}
14
15// Getting Nodemailer all setup with the credentials for when the 'sendEmail()'
16// function is called.
17const transporter = nodemailer.createTransport(credentials)
18
19// exporting an 'async' function here allows 'await' to be used
20// as the return value of this function.
21module.exports = async (to, content) => {
22  
23  // The from and to addresses for the email that is about to be sent.
24  const contacts = {
25    from: process.env.MAIL_USER,
26    to
27  }
28  
29  // Combining the content and contacts into a single object that can
30  // be passed to Nodemailer.
31  const email = Object.assign({}, content, contacts)
32  
33  // This file is imported into the controller as 'sendEmail'. Because 
34  // 'transporter.sendMail()' below returns a promise we can write code like this
35  // in the contoller when we are using the sendEmail() function.
36  //
37  //  sendEmail()
38  //   .then(() => doSomethingElse())
39  // 
40  // If you are running into errors getting Nodemailer working, wrap the following 
41  // line in a try/catch. Most likely is not loading the credentials properly in 
42  // the .env file or failing to allow unsafe apps in your gmail settings.
43  await transporter.sendMail(email)
44
45}

1const { CLIENT_ORIGIN } = require('../config')
2
3// This file is exporting an Object with a single key/value pair.
4// However, because this is not a part of the logic of the application
5// it makes sense to abstract it to another file. Plus, it is now easily 
6// extensible if the application needs to send different email templates
7// (eg. unsubscribe) in the future.
8module.exports = {
9
10  confirm: id => ({
11    subject: 'React Confirm Email',
12    html: `
13      <a href='${CLIENT_ORIGIN}/confirm/${id}'>
14        click to confirm email
15      </a>
16    `,      
17    text: `Copy and paste this link: ${CLIENT_ORIGIN}/confirm/${id}`
18  })
19  
20}