korona/index.html at master · 0xGG/korona · GitHub

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<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="theme-color" content="#2196F1" />
    <title>Korona P2P Chat</title>
    <style>
      html, body {
        margin: 0;
        padding: 0;
      }
      code {
        color: #f50;
        /* border: 1px solid #f50;
        padding: 2px 6px;
        border-radius: 4px;*/
      }

      body {
        display: flex;
        flex-direction: column;
        background-color: #222;
        color: #fff;
        font-family: Arial;
        height: 100%;
      }

      #shareable-link {
        cursor: pointer;
      }

      #top-panel {
        padding: 8px;
      }
      #top-panel p {
        margin: 2px;
      }
      #chat-panel {
        flex: 1;
        padding: 0 8px;
        overflow-y: auto;
      }
      #bottom-panel {
        padding: 8px;
        display: flex;
        flex-direction: row;
      }
      #message-input {
        flex: 1;
        padding: 8px;
        margin-right: 4px;
      }
      #send-button {
        cursor: pointer;
      }

      .message-container {
        display: flex;
        flex-direction: row;
        align-items: center;
        margin: 8px 0;
        overflow-y: auto;
        overflow-x: hidden;
      }
      code.sender {
        margin-right: 8px;
      }
      p.message {
        margin: 0;
        word-break: break-all;
      }
    </style>
  </head>
  <body>
    <div id="top-panel">
      <p>Your id is <code id="peer-id">connecting...</code>, currently <code id="peers-number">0</code> peer(s) online</code></p>
      <p>
        Copy <code id="shareable-link" onclick="selectText(this.id)">connecting...</code> to your friends to let
        them join your chat
      </p>
    </div>
    <div id="chat-panel">

    </div>
    <div id="bottom-panel">
      <input id="message-input" placeholder="Please wait..." autofocus disabled />
      <button id="send-button">Send</button>
    </div>
  </body>
  <script src="https://cdn.jsdelivr.net/npm/peerjs@1.4.6/dist/peerjs.min.js"></script>
  <script src="./build/bundle.js"></script>
  <script>
    function randomId() {
      return Math.random()
        .toString(36)
        .substr(2, 9);
    }

    function copyToClipboard() {
      const copyText = document.getElementById("shareable-link").innerText;
      const textArea = document.createElement("textarea");
      textArea.value = copyText;
      document.body.appendChild(textArea);
      textArea.select();
      document.execCommand("copy");
      textArea.remove();
    }

    class RandomColorGenerator {
      constructor() {
        this.cache = {};
      }
      hashCode(s) {
        let n = s.split("").reduce(function(a, b) {
          a = (a << 5) - a + b.charCodeAt(0);
          return a & a;
        }, 0);
        n = Math.abs(n);
        const x = "0." + n.toString();
        return parseFloat(x);
      }
      generateColor(key) {
        if (key in this.cache) {
          return this.cache[key];
        } else {
          const color =
            "#" +
            (((1 << 24) * /* Math.random() */ this.hashCode(key)) | 0).toString(16);
          this.cache[key] = color;
          return color;
        }
      }
    }

    function selectText(id){
      var sel, range;
      var el = document.getElementById(id); //get element id
      if (window.getSelection && document.createRange) { //Browser compatibility
        sel = window.getSelection();
        if(sel.toString() == ''){ //no text selection
        window.setTimeout(function(){
          range = document.createRange(); //range object
          range.selectNodeContents(el); //sets Range
          sel.removeAllRanges(); //remove all ranges from selection
          sel.addRange(range);//add Range to a Selection.
        },1);
        }
      }else if (document.selection) { //older ie
        sel = document.selection.createRange();
        if(sel.text == ''){ //no text selection
          range = document.body.createTextRange();//Creates TextRange object
          range.moveToElementText(el);//sets Range
          range.select(); //make selection.
        }
      }

      copyToClipboard()
    }

    async function main() {
      const randomColorGenerator = new RandomColorGenerator();
      const maxPeers = 5;
      const peerId = randomId();
      const chatMessages = [];
      const chatPanel = document.getElementById("chat-panel");
      const messageInput = document.getElementById("message-input");
      const sendButton = document.getElementById("send-button");

      const appendMessageElement = (messageID, peerId, message)=> {
        console.log("* appendMessageElement: ", messageID, peerId, message);
        if (chatMessages.find(m => m.id === messageID)) { // Message already exists
          return;
        }

        chatMessages.push({id: messageID, peerId: peerId, message: message});
        const messageContainer = document.createElement("div");
        messageContainer.classList.add("message-container")
        const sender = document.createElement("code");
        sender.classList.add("sender")
        sender.innerText = peerId
        sender.style.color = randomColorGenerator.generateColor(peerId);
        const messageElement = document.createElement("p");
        messageElement.classList.add("message");
        messageElement.innerText = message;
        messageContainer.appendChild(sender);
        messageContainer.appendChild(messageElement);
        chatPanel.appendChild(messageContainer)


        chatPanel.scrollTop = chatPanel.scrollHeight * 2;
      }

      const targetRoomIdMatch = location.search.match(/roomId\=(.+)$/);
      let roomId = "";
      if (targetRoomIdMatch) {
        roomId = targetRoomIdMatch[1];
      }

      const peer = new Korona.Korona({
        peerId: peerId,
        roomId: roomId,
        peerJSOptions: {
          // debug: 2,
          // host: "crossnote.app",
          // path: "/peer",
          // secure: true,
        },
        maxPeers: maxPeers,
      });

      peer.on("open", async(peerId)=> {
        document.getElementById("peer-id").innerText = peerId;
        document.getElementById("peer-id").style.color = randomColorGenerator.generateColor(peerId);
        document.getElementById("shareable-link").innerText =
          location.protocol + "//" + location.host + location.pathname + "?peerId=" + peer.peer.id;

        messageInput.placeholder = "Enter your message here"
        messageInput.disabled = false;

        const sendMessage = ()=> {
          const value = messageInput.value.trim();
            if (!value.length) {
              messageInput.value = "";
              return;
            }
            messageInput.value = "";
            messageInput.focus();

            // broadcast
            const messageID = randomId();
            peer.broadcast({
              type: "SendMessage",
              id: messageID,
              peerId: peerId,
              message: value
            });

            // create dom element
            appendMessageElement(messageID, peerId, value);
        }

        messageInput.addEventListener("keydown", (event)=> {
          if (event.which === 13) {
           sendMessage();
          }
        })
        sendButton.addEventListener("click", ()=> {
          sendMessage();
        })


        const targetPeerIDMatch = location.search.match(/peerId\=(.+)$/);
        if (targetPeerIDMatch) {
          const targetPeerID = targetPeerIDMatch[1];
          peer.requestConnection(targetPeerID);
        }

        peer.on("peerJoined", async (peerId) => {
          console.log("peer joined: ", peerId);
          document.getElementById("peers-number").innerText = peer.network.size;
        })

        peer.on("peerLeft", async (peerId) => {
          console.log("peer left: ", peerId);
          document.getElementById("peers-number").innerText = peer.network.size;
        })

        peer.on("data", (data)=> {
          console.log("received data: ", data)
          if (data.type === "SendMessage") {
            appendMessageElement(data.id, data.peerId, data.message);
          } else if (data.type === "ChatMessages") {
            const chatMessages = data.messages;
            chatMessages.forEach((chatMessage)=> {
              appendMessageElement(chatMessage.id, chatMessage.peerId, chatMessage.message);
            })
          }
        })

        peer.on("disconnected", ()=> {
          console.log("Disconnected");
        })

        peer.on("close", ()=> {
          console.log("Close")
        })

        peer.on("pubsubHostChanged", ()=> {
          console.log("pubsubHostChanged")
        })

        peer.on("sync", async (send)=> {
          send({
            type: "ChatMessages",
            messages: chatMessages,
          })
        })

      })

      window["peer"] = peer;
    }

    main();
  </script>
</html>