NostrPostr/NostrRelay/src/main/resources/public/chat.html at master · Giszmo/NostrPostr · GitHub

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<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Nostr Voice Chat</title></head>
<body>
<h2>Nostr Voice Chat Proof of Concept</h2>
<p>By hitting "send" you agree to broadcasting the recorded audio to the world
    without any encryption. For more information read
    <a href="https://github.com/Giszmo/Nostr-Voice-Chat">here</a>.</p>
<p>
    <button type="button" id="record">Record</button>
    <button type="button" id="stopRecord" disabled>Send</button>
    <button type="button" id="dismiss" disabled>Dismiss</button>
</p>
<p>
    <audio id=recordedAudio></audio>
</p>
<script type="module">
import { generatePrivateKey, getPublicKey, relayConnect, relayPool } from './nostr.js'
window.nostr = { generatePrivateKey, getPublicKey, relayConnect, relayPool }
</script>
<script class="containerScript">
window.addEventListener("load", async () => {
  window.privKey = window.nostr.generatePrivateKey()
  window.pubKey = window.nostr.getPublicKey(window.privKey)
  window.pool = window.nostr.relayPool()
  window.pool.setPrivateKey(window.privKey)
  window.pool.addRelay('wss://relay.nostr.info', {read: true, write: true})
  window.pool.sub({cb: async (event, relay) => {
    let blob = await b64toBlob(event.content)
    play(blob)
  }, filter: {kinds: [21212]}})
})

navigator
  .mediaDevices
  .getUserMedia({audio:true})
  .then(stream => {
    handlerFunction(stream)
  })

function handlerFunction(stream) {
  rec = new MediaRecorder(stream)
  rec.ondataavailable = e => {
    audioChunks.push(e.data)
    if (rec.state == "inactive") {
      if (audioChunks[0] === -1) {
        console.log("dismissed")
        return
      }
      let blob = new Blob(audioChunks,{type:'audio/mp3'})
      play(blob)
      sendData(blob)
    }
  }
}

function play(blob) {
  if (rec.state == "inactive") {
    recordedAudio.src = URL.createObjectURL(blob)
    recordedAudio.controls=true
    recordedAudio.autoplay=true
  }
}

function b64toBlob(base64) {
  return fetch(base64).then(res => res.blob())
}

function blobToB64(blob) {
  return new Promise((resolve, _) => {
    const reader = new FileReader()
    reader.onloadend = () => resolve(reader.result)
    reader.readAsDataURL(blob)
  });
}

async function sendData(blob) {
  let event = {
    pubkey: window.pubKey,
    created_at: Math.round(Date.now() / 1000),
    kind: 21212,
    tags: [],
    content: await blobToB64(blob)
  }
  window.pool.publish(event)
}

record.onclick = e => {
  record.style.backgroundColor = "blue"
  record.disabled = true;
  stopRecord.disabled=false;
  dismiss.disabled=false
  audioChunks = [];
  rec.start();
}

stopRecord.onclick = e => {
  record.style.backgroundColor = "green"
  record.disabled = false;
  stopRecord.disabled=true;
  dismiss.disabled=true
  rec.stop();
}

dismiss.onclick = e => {
  audioChunks.push(-1) // HACK
  record.style.backgroundColor = "red"
  record.disabled = false;
  stopRecord.disabled=true;
  dismiss.disabled=true
  rec.stop();
}
</script>
</body>
</html>