badgen.net/libs/live-fns/amo.js

const axios = require('../axios.js')
const xml2js = require('xml2js')
const millify = require('millify')
const round = require('../utils/round.js')
const stars = require('../utils/stars.js')
const semColor = require('../utils/sem-color.js')

module.exports = async function (topic, ...args) {
  const endpoint = `https://services.addons.mozilla.org/en-US/firefox/api/1.5/addon/${args[0]}`
  const xml = await axios.get(endpoint).then(res => res.data)

  const { addon } = await new Promise((resolve, reject) => {
    xml2js.parseString(xml, {
      trim: true,
      explicitArray: false
    }, (err, res) => err ? reject(err) : resolve(res))
  })

  switch (topic) {
    case 'v':
      return {
        subject: 'mozilla add-on',
        status: 'v' + addon.version,
        color: semColor(addon.version)
      }
    case 'users':
      return {
        subject: 'users',
        status: millify(parseInt(addon.daily_users)),
        color: 'green'
      }
    case 'rating':
      return {
        subject: 'rating',
        status: `${round(addon.rating, 2)}/5`,
        color: 'green'
      }
    case 'stars':
      return {
        subject: 'stars',
        status: stars(addon.rating),
        color: 'green'
      }
    case 'reviews':
      return {
        subject: 'reviews',
        status: addon.reviews.$.num,
        color: 'green'
      }
    default:
      return {
        subject: 'mozilla add-on',
        status: 'unknown',
        color: 'grey'
      }
  }
}