const XML = require('./xml')
const request = require('request-promise-native')

const getRss = async url => {
  // http://www.hellointernet.fm/podcast?format=rss
  url = new URL(url)
  if (url.protocol !== 'http:' && url.protocol !== 'https:') throw new Error('Unsupported protocol: ' + url.protocol)
  const xml = await request(url, {
    headers: {
      'Accept': 'application/xml;application/rss+xml',
      'User-Agent': 'rssunlimited.com'
    }
  })
  const data = XML.parse(xml)
  if (!data.rss) throw new Error('Response not an RSS feed.')
  return data
}

module.exports = {
  getRss
}