Resize image by Firebase Extensions - 5

uploadPhoto.js

const functions = require('firebase-functions')
const request = require('request-promise')
const admin = require('firebase-admin')
const UUID = require('uuid-v4')
const path = require('path')
const os = require('os')
const fs = require('fs')
admin.initializeApp()

const LINE_MESSAGING_API = 'https://api.line.me/v2/bot'
const LINE_CONTENT_API = 'https://api-data.line.me/v2/bot/message'
const LINE_HEADER = {
  'Content-Type': 'application/json',
  Authorization: 'Bearer YOUR-CHANNEL-ACCESS-TOKEN'
}

exports.uploadPhoto = functions.https.onRequest(async (req, res) => {
  let event = req.body.events[0]
  if (event.type === 'message' && event.message.type === 'image') {
    let urls = await upload(event)
    await reply(
      event.replyToken,
      {
        "type": "flex",
        "altText": "Flex Message",
        "contents": {
          "type": "bubble",
          "hero": {
            "type": "image",
            "url": urls.original,
            "size": "full",
            "aspectRatio": "1:1",
            "aspectMode": "cover"
          },
          "footer": {
            "type": "box",
            "layout": "horizontal",
            "spacing": "md",
            "contents": [
              {
                "type": "button",
                "action": {
                  "type": "uri",
                  "label": "Original",
                  "uri": urls.original
                },
                "style": "secondary"
              },
              {
                "type": "button",
                "action": {
                  "type": "uri",
                  "label": "Thumb",
                  "uri": urls.thumb
                },
                "style": "primary"
              }
            ]
          }
        }
      }
    )
  }
  return res.end()
})

const upload = async (event) => {
  let url = `${LINE_CONTENT_API}/${event.message.id}/content`
  let buffer = await request.get({
    headers: LINE_HEADER,
    uri: url,
    encoding: null
  })

  let filename = `${event.timestamp}.jpg`
  let tempLocalFile = path.join(os.tmpdir(), filename)
  await fs.writeFileSync(tempLocalFile, buffer)

  let uuid = UUID()
  let bucket = admin.storage().bucket()
  let file = await bucket.upload(tempLocalFile, {
    destination: `photos/${event.source.userId}/${filename}`,
    metadata: {
      cacheControl: 'no-cache',
      metadata: {
        firebaseStorageDownloadTokens: uuid
      }
    }
  })
  fs.unlinkSync(tempLocalFile)

  let prefix = `https://firebasestorage.googleapis.com/v0/b/${bucket.name}/o`
  let suffix = `alt=media&token=${uuid}`
  return {
    original: `${prefix}/${encodeURIComponent(file[0].name)}?${suffix}`,
    thumb: `${prefix}/photos${encodeURIComponent(`/${event.source.userId}/thumbs/${event.timestamp}_200x200.jpg`)}?${suffix}`
  }
}

const reply = (replyToken, payload) => {
  request.post({
    uri: `${LINE_MESSAGING_API}/message/reply`,
    headers: LINE_HEADER,
    body: JSON.stringify({
      replyToken: replyToken,
      messages: [payload]
    })
  })
}