site/pages/api/join.js

import AirtablePlus from 'airtable-plus'

const joinTable = new AirtablePlus({
  apiKey: process.env.AIRTABLE_API_KEY,
  baseID: 'appaqcJtn33vb59Au',
  tableName: 'Join Requests'
})

export default async (req, res) => {
  res.setHeader('Access-Control-Allow-Origin', '*')
  res.setHeader('Access-Control-Allow-Headers', '*')
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed, use POST' })
  }

  let data = req?.body || JSON.parse(req?.body || '{}')
  console.log(data)
  const exists = await isDuplicate(data.name, data.email, data.reason)
  console.log('Exists:', exists)

  if (!exists) {
    await joinTable.create({
      'Full Name': data.name,
      'Email Address': data.email,
      Student: data.teen,
      Reason: data.reason
    })
    if (data.teen) {
      console.log('Posting to Slack…')
      let postData = {
        channel: 'G0132DNFE7J', // G0147KPNHU0
        blocks: [
          {
            type: 'section',
            text: {
              type: 'mrkdwn',
              text: 'Someone just requested to join the Slack.'
            }
          },
          {
            type: 'section',
            text: {
              type: 'mrkdwn',
              text: `*Full name:* ${data.name}\n*Email:* ${
                data.email
              }\n*Student:* ${data.teen ? 'true' : 'false'}\n*Reason:* ${
                data.reason
              }`
            }
          },
          {
            type: 'actions',
            elements: [
              {
                type: 'button',
                text: {
                  type: 'plain_text',
                  emoji: true,
                  text: 'Send Invitation'
                },
                style: 'primary',
                action_id: 'invite_member'
              },
              {
                type: 'button',
                text: {
                  type: 'plain_text',
                  emoji: true,
                  text: 'Deny'
                },
                style: 'danger',
                action_id: 'deny'
              }
            ]
          }
        ]
      }
      await fetch('https://slack.com/api/chat.postMessage', {
        method: 'post',
        headers: {
          'Content-Type': 'application/json',
          Authorization: `Bearer ${process.env.SLACK_BOT_TOKEN}`
        },
        body: JSON.stringify(postData)
      }).catch(err => console.error(err))
    }
  }
  res.json({ status: 'success' })
}

async function isDuplicate(name, email, reason) {
  reason = reason?.replace(`'`, `\\'`)
  const exists = await joinTable.read({
    filterByFormula: `AND({Full Name} = '${name}', {Email Address} = '${email}', Reason = '${reason}')`
  })
  return typeof exists[0] !== 'undefined'
}