index.js

// Some hardcoded variables that you can change
const prefix = "!"
const guild_id = "488540747361026058"
const verified_role_id = "652669689683509249"
const welcome_emoji_id = "637434582500900864"
const reaction_emoji_id = "720420182538977281"

// Don't touch the code beflow this line!
if (process.env.NODE_ENV === 'development') {
    require('dotenv').config()
}
const fs = require('fs')
const Discord = require('discord.js')
const client = new Discord.Client()
let roleName = ""

client.on('ready', async () => {
  console.log(`Logged in as ${client.user.tag}!`)
  await client.user.setActivity('Verify in #verification');
  roleName = client.guilds.get(guild_id).roles.get(verified_role_id).name
})

client.on('message', msg => {
  
  const args = msg.content
    .slice(prefix.length)
    .trim()
    .split(/ +/g)
  
  const command = args
    .shift()
    .toLowerCase()
    .replace('/', '')
  
  // svm = set verification message
  if (
      !msg.author.bot
      && msg.content.indexOf(prefix) === 0
      && command === 'svm'
    ) {

    // If sender of message is not the guild owner, cancel action
    if (msg.member.guild.owner.id !== msg.member.id) return
    
    const introMessageContent = fs.readFileSync('intro-message.md', {encoding:'utf8', flag:'r'})
    const communityGuidelinesContent = fs.readFileSync('community-guidelines.md', {encoding:'utf8', flag:'r'})
    const verificationMessageContent = fs.readFileSync('verification-message.md', {encoding:'utf8', flag:'r'})
    
    const embed = new Discord.RichEmbed()
    
    const welcomeEmoji = `<:${msg.guild.emojis.get(welcome_emoji_id).identifier}>`
    const welcomeTitle = `${welcomeEmoji} Welcome to ${msg.guild.name}!`
      
    embed.addField(welcomeTitle, introMessageContent)
    embed.addField('🎗 Community Guidelines', communityGuidelinesContent)
    embed.addField('🔐 Getting Verified', verificationMessageContent)
    
    msg.channel.send({embed}).then(theVerificationMessage => theVerificationMessage.react(reaction_emoji_id))
    msg.delete()
  }

  return
})

client.on('messageReactionAdd', ( { message: { channel } }, user ) => {
    if (/verification/.test(channel.name)) {
        channel.guild.fetchMember(user).then(member => {
          return member.addRole(verified_role_id)
        }).then(() => {
            console.log(`The ${roleName} role has been added to member ${user.tag} successfully!`)
        }).catch(error => {
            console.error(error)
        })
    }
})

client.on('messageReactionRemove', ( { message: { channel } }, user ) => {
    if (/verification/.test(channel.name)) {
        channel.guild.fetchMember(user).then(member => {
          return member.removeRole(verified_role_id)
        }).then(() => {
            console.log(`The ${roleName} has been removed from member ${user.tag} successfully!`)
        }).catch(error => {
            console.error(error)
        })
    }
})

client.on('raw', ({ d: data, t: event }) => {
    if (['MESSAGE_REACTION_ADD', 'MESSAGE_REACTION_REMOVE'].includes(event)) {
        const { channel_id, user_id, message_id, emoji } = data

        const channel = client.channels.get(channel_id)

        if (!channel.messages.has(message_id)) channel.fetchMessage(
            message_id
        ).then( message => {
            const reaction = message.reactions.get(
                emoji.id ? `${emoji.name}:${emoji.id}` : emoji.name 
            )

            const user = client.users.get(user_id)

            if (reaction) reaction.users.set(user_id, user)
            
            return client.emit( 
                event === 'MESSAGE_REACTION_ADD' 
                    ? 'messageReactionAdd' 
                    : 'messageReactionRemove', 
                reaction, 
                user
            )
        })
    }
})

if (process.env.TOKEN !== null) {
    client.login(process.env.TOKEN)
} else {
    console.error('Bot token is empty!')
}