const config = require('../../config')
const crypto = require('crypto')

const verifyLine = async (c, n) => {
  if (!('request' in c) || !('raw' in c.request)) return c.throw(400, 'body not found')
  let xSignature = c.get('x-line-signature') || ''
  if (typeof xSignature !== 'string' || xSignature.length === 0) return c.throw(400, 'signature not found')
  let signature = crypto.createHmac('SHA256', config.line.secret).update(c.request.raw).digest('base64')
  if (signature !== xSignature) return c.throw(403, 'signature not match')
  return n()
}

module.exports = {
  verifyLine
}