Use Vuejs for web UI

webroot/js/app.js

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+function setupApp() {
+  window.app = new Vue({
+    el: "#app",
+    data: {
+      streamStatus: "",
+    },
+  });
+
+  window.messagesContainer = new Vue({
+    el: "#messages-container",
+    data: {
+      messages: []
+    }
+  })
+
+  window.chatForm = new Vue({
+    el: "#chatForm",
+    data: {
+      message: {
+        author: localStorage.author || "Viewer" + (Math.floor(Math.random() * 42) + 1),
+        body: ""
+      }
+    },
+    methods: {
+      submitChatForm: function (e) {
+        const message = new Message(this.message)
+        const messageJSON = JSON.stringify(message)
+        window.ws.send(messageJSON)
+        e.preventDefault()
+
+        this.message.body = ""
+      }
+    }
+  });
+}
+
+
+async function getStatus() {
+  let url = "/status";
+  try {
+    let response = await fetch(url);
+    let status = await response.json(); // read response body and parse as JSON
+    app.streamStatus = status.online
+      ? "Stream is online."
+      : "Stream is offline."
+
+  } catch (e) {
+    app.streamStatus = "Stream server is offline."
+  }
+
+  setInterval(getStatus, 5000)
+}
+
+function setupWebsocket() {
+  const protocol = location.protocol == "https:" ? "wss" : "ws"
+  var ws = new WebSocket(protocol + "://" + location.host + "/entry")
+  ws.onmessage = (e) => {
+    var model = JSON.parse(e.data)
+    var message = new Message(model);
+    this.messagesContainer.messages.push(message)
+    scrollSmoothToBottom("messages-container")
+  }
+  window.ws = ws
+}
+
+setupApp()
+getStatus();
+setupWebsocket()
+
+var video = document.getElementById("video")
+var videoSrc = "hls/stream.m3u8"
+if (Hls.isSupported()) {
+  var hls = new Hls()
+  hls.loadSource(videoSrc)
+  hls.attachMedia(video)
+  hls.on(Hls.Events.MANIFEST_PARSED, function () {
+    video.play()
+  });
+}
+// hls.js is not supported on platforms that do not have Media Source
+// Extensions (MSE) enabled.
+//
+// When the browser has built-in HLS support (check using `canPlayType`),
+// we can provide an HLS manifest (i.e. .m3u8 URL) directly to the video
+// element through the `src` property. This is using the built-in support
+// of the plain video element, without using hls.js.
+//
+// Note: it would be more normal to wait on the 'canplay' event below however
+// on Safari (where you are most likely to find built-in HLS support) the
+// video.src URL must be on the user-driven white-list before a 'canplay'
+// event will be emitted; the last video event that can be reliably
+// listened-for when the URL is not on the white-list is 'loadedmetadata'.
+else if (video.canPlayType("application/vnd.apple.mpegurl")) {
+  video.src = videoSrc
+  video.addEventListener("loadedmetadata", function () {
+    video.play()
+  });
+}
+
+function scrollSmoothToBottom(id) {
+  var div = document.getElementById(id)
+  $('#' + id).animate({
+    scrollTop: div.scrollHeight - div.clientHeight
+  }, 500)
+}