unpkg/server/actions/showStats.js

const subDays = require("date-fns/sub_days")
const startOfDay = require("date-fns/start_of_day")
const startOfSecond = require("date-fns/start_of_second")
const StatsAPI = require("../StatsAPI")

function showStats(req, res) {
  let since, until
  switch (req.query.period) {
    case "last-day":
      until = startOfDay(new Date())
      since = subDays(until, 1)
      break
    case "last-week":
      until = startOfDay(new Date())
      since = subDays(until, 7)
      break
    case "last-month":
      until = startOfDay(new Date())
      since = subDays(until, 30)
      break
    default:
      until = req.query.until ? new Date(req.query.until) : startOfSecond(new Date())
      since = new Date(req.query.since)
  }

  if (isNaN(since.getTime())) {
    return res.status(403).send({ error: "?since is not a valid date" })
  }

  if (isNaN(until.getTime())) {
    return res.status(403).send({ error: "?until is not a valid date" })
  }

  if (until <= since) {
    return res.status(403).send({ error: "?until date must come after ?since date" })
  }

  if (until >= new Date()) {
    return res.status(403).send({ error: "?until must be a date in the past" })
  }

  StatsAPI.getStats(since, until).then(
    stats => {
      res
        .set({
          "Cache-Control": "public, max-age=60",
          "Cache-Tag": "stats"
        })
        .send(stats)
    },
    error => {
      console.error(error)
      res.status(500).send({ error: "Unable to fetch stats" })
    }
  )
}

module.exports = showStats