[Get email attachments with IMAP] #email #imap

attachment-download.js

import { ImapFlow } from 'imapflow'
import { simpleParser } from 'mailparser'
import { writeFile } from 'node:fs/promises'
import path from 'node:path'

import { env } from './env.js'

const { EMAIL_HOST, EMAIL_PORT, EMAIL_USER, EMAIL_PASSWORD } = env

const client = new ImapFlow({
  host: EMAIL_HOST,
  port: EMAIL_PORT,
  secure: true,
  auth: {
    user: EMAIL_USER,
    pass: EMAIL_PASSWORD
  },
  logger: false
})

// Wait until client connects and authorizes
await client.connect()

// Select and lock a mailbox. Throws if mailbox does not exist
const lock = await client.getMailboxLock('INBOX')
try {
  console.log('Loading messages..')

  while (true) {
    const firstMessage = await client.fetchOne('1:*', {
      source: true
    })

    if (!firstMessage) {
      console.log('INBOX is empty')
      break
    }

    const parsedMessage = await simpleParser(firstMessage.source)

    console.log(
      `Message loaded - "${parsedMessage.subject}" (uid: ${firstMessage.uid})`
    )

    for (const attachment of parsedMessage.attachments) {
      if (!attachment.filename) continue

      await writeFile(
        path.join(process.cwd(), '__temp/attachments', attachment.filename),
        attachment.content
      )

      console.log(`  attachment downloaded - ${attachment.filename}`)
    }

    const result = await client.messageDelete(String(firstMessage.uid), {
      uid: true
    })

    console.log(`  message deleted - ${result}`)
  }
} finally {
  // Make sure lock is released, otherwise next `getMailboxLock()` never returns
  lock.release()
}

// log out and close connection
await client.logout()

console.log('DONE.')