index.js

(() => {
  globalThis.qs = Object.fromEntries(new URLSearchParams(document.location.search).entries())

  const t = qs.t || 5

  if (qs.relay) {
    const socket = new WebSocket(qs.relay)

    socket.onopen = function (event) {
      console.log('wss open', qs.relay)
      let now = new Date().getTime()
      now = Math.floor(now / 1000.0)

      const filter = { since: now }
      if (qs.pubkey) {
        filter.authors = [qs.pubkey]
      }
      if (qs.kind) {
        const kinds = Array.isArray(qs.kind) ? qs.kind : [qs.kind]
        filter.kinds = kinds.map(kind => parseInt(kind))
      }

      let subscribe = JSON.stringify(['REQ', 'tail', filter])

      if (qs.pubkey) {
        subscribe = `["REQ", "tail", { "authors": ["${qs.pubkey}"], "since": ${now} }]`
      }
      console.log(subscribe)
      socket.send(subscribe)
    };

    socket.onmessage = function (event) {
      const json = JSON.parse(event?.data)
      if (json[0] === 'EOSE') {
        console.log('EOSE')
        return;
      }
      console.log('refreshing in', t)
      setTimeout(() => {
        document.location.reload()
      }, t * 1000)
    };
  }
})()