fileShare.js

import fetch from 'isomorphic-unfetch'

import { initBot, transcript, reaction } from '../utils'

const uploadToCDN = async files => {
  console.log('Generating links for ', files.length, 'file(s)')

  const fileURLs = files.map(f => f['url_private'])

  return new Promise((resolve, reject) => {
    fetch('https://cdn-2moycvmxo.hackclub.dev/api/v1/new', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${process.env.SLACK_BOT_TOKEN}`
      },
      body: JSON.stringify(fileURLs),
    })
      .then(r => r.json())
      .then(resolve)
      .catch(reject)
  })
}

export default async (bot = initBot(), message) => {
  const cdnChannelID = 'C016DEDUL87'

  const { ts, channel, files } = message
  if (channel != cdnChannelID) {
    return
  }

  const extFlavorOptions = files.map(file => {
    try {
      return transcript(`fileShare.extensions.${file.filetype}`)
    } catch (e) {
      return null
    }
  })
  const extFlavor = extFlavorOptions[Math.floor(Math.random() * extFlavorOptions.length)]

  if (extFlavor) {
    bot.replyInThread(message, { text: extFlavor })
  }

  try {
    const results = {}
    await Promise.all([
      reaction(bot, 'add', channel, ts, 'beachball'),
      uploadToCDN(files)
        .then(f => {
          results.links = f
        })
        .catch(e => {
          results.error = e
        }),
    ])
    if (results.error) {
      throw results.error
    }

    if (results.links) {
      await Promise.all([
        reaction(bot, 'remove', channel, ts, 'beachball'),
        reaction(bot, 'add', channel, ts, 'white_check_mark'),
        bot.replyInThread(message, {
          text: transcript('fileShare.success', { links: results.links, user: message.user }),
          unfurl_media: false,
          unfurl_links: false,
        }),
      ])
    }
  } catch (err) {
    const maxFileSize = 100000000 // 100MB in bytes
    const fileTooBig = files.filter(f => f.size > maxFileSize).length > 0
    if (fileTooBig) {
      await bot.replyInThread(message, transcript('fileShare.errorTooBig'))
    } else {
      await bot.replyInThread(message, transcript('fileShare.errorGeneric'))
    }

    await Promise.all([
      reaction(bot, 'remove', channel, ts, 'beachball'),
      reaction(bot, 'add', channel, ts, 'no_entry'),
      bot.replyInThread(message, transcript('errors.general', { err })),
    ])
  }
}