Merge branch 'fix/use_candidates'

Dockerfile

@@ -0,0 +1,20 @@
+# Dockerfile
+FROM golang:tip-alpine3.22 AS builder
+WORKDIR /app
+# RUN apk add --no-cache git ca-certificates
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+ENV CGO_ENABLED=0 GOOS=linux GOARCH=amd64
+RUN go build -ldflags="-s -w" -o /app/echo .
+
+FROM alpine:3.22
+# RUN apk add --no-cache ca-certificates tzdata && update-ca-certificates
+RUN addgroup -S app && adduser -S app -G app
+USER app
+WORKDIR /app
+COPY --from=builder /app/echo /app/echo
+COPY --from=builder /app/front_files /app/front_files
+# EXPOSE is optional with custom networking, we can keep or remove it as we are using custom network with compose
+EXPOSE 8900
+ENTRYPOINT ["/app/echo"]

docker-compose.yml

@@ -0,0 +1,19 @@
+
+services:
+  echo:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: echo-image:latest
+    container_name: echo
+    restart: unless-stopped
+    ports:
+      - "8900:8900"
+    networks:
+      - echo-net
+    environment:
+      - TZ=UTC
+networks:
+  echo-net:
+    name: echo-net
+      

front_files/index.css

@@ -7,7 +7,7 @@
 }
 
 :root {
-  --bg: #0a3558;        /* ocean-ish blue */
+  --bg: #041f39;
   --bg-accent: #0f4470;
   --text: #f5f7fb;
   --muted: #c3cfde;
@@ -15,10 +15,10 @@
   --primary-hover: #2f9ce2;
   --secondary: #ffffff;
   --secondary-text: #0a3558;
-  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.35);
+  --shadow-soft: 0 20px 40px rgba(7, 15, 30, 0.5);
-  --radius-lg: 18px;
+  --radius-lg: 22px;
   --transition: 0.18s ease-out;
-  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
+  --font-main: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
     sans-serif;
 }
 
@@ -29,11 +29,12 @@ body {
 
 body {
   font-family: var(--font-main);
-  background: radial-gradient(circle at top, #1c5b90, var(--bg));
+  background: linear-gradient(135deg, #05284b, #03182d 55%);
   color: var(--text);
   display: flex;
   align-items: stretch;
   justify-content: center;
+  padding: 32px;
 }
 
 /* Layout */
@@ -57,12 +58,20 @@ body {
 }
 
 .logo {
-  font-size: 2.4rem;
+  font-size: 2.8rem;
-  letter-spacing: 0.12em;
+  letter-spacing: 0.16em;
   text-transform: uppercase;
   font-weight: 700;
   color: #fafdff;
-  text-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
+  text-shadow: 0 6px 22px rgba(0, 0, 0, 0.55);
+  margin-right: 18px;
+}
+
+.tagline {
+  color: rgba(245, 247, 251, 0.75);
+  font-size: 1rem;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
 }
 
 /* Main card */
@@ -75,13 +84,25 @@ body {
 }
 
 .card {
-  background: linear-gradient(135deg, var(--bg-accent), #0b2b44);
+  background: linear-gradient(160deg, rgba(16, 40, 73, 0.95), rgba(7, 26, 45, 0.92));
-  padding: 28px 24px;
+  padding: 32px 30px;
   border-radius: var(--radius-lg);
   box-shadow: var(--shadow-soft);
   width: 100%;
-  max-width: 460px;
+  max-width: 520px;
-  border: 1px solid rgba(255, 255, 255, 0.08);
+  border: 1px solid rgba(255, 255, 255, 0.07);
+}
+
+.card-heading {
+  font-size: 1.35rem;
+  font-weight: 600;
+  margin-bottom: 6px;
+}
+
+.card-subheading {
+  font-size: 0.95rem;
+  color: rgba(255, 255, 255, 0.7);
+  margin-bottom: 20px;
 }
 
 .actions {
@@ -96,8 +117,8 @@ body {
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 100%;
+  width: auto;
-  padding: 12px 18px;
+  padding: 14px 20px;
   border-radius: 999px;
   border: none;
   font-size: 1rem;
@@ -125,6 +146,10 @@ body {
   box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
 }
 
+.actions .btn {
+  width: 100%;
+}
+
 .btn-secondary {
   background: var(--secondary);
   color: var(--secondary-text);
@@ -150,18 +175,24 @@ body {
 
 .input {
   width: 100%;
-  padding: 10px 12px;
+  padding: 14px 16px;
-  border-radius: 10px;
+  border-radius: 16px;
-  border: 1px solid rgba(255, 255, 255, 0.18);
+  border: 1px solid rgba(255, 255, 255, 0.25);
-  background: rgba(3, 16, 32, 0.5);
+  background: rgba(5, 19, 36, 0.7);
   color: var(--text);
-  font-size: 0.95rem;
+  font-size: 1.05rem;
   outline: none;
-  margin-bottom: 10px;
+  margin-bottom: 14px;
   transition: border-color var(--transition), box-shadow var(--transition),
     background-color var(--transition);
 }
 
+.chat-input-row .input {
+  font-size: 1.05rem;
+  padding: 18px 18px;
+  border-radius: 18px;
+}
+
 .input::placeholder {
   color: rgba(195, 207, 222, 0.8);
 }
@@ -207,7 +238,15 @@ body {
   justify-content: space-between;
   align-items: center;
   gap: 12px;
-  margin-bottom: 4px;
+  margin-bottom: 12px;
+}
+
+.chat-title {
+  font-size: 0.85rem;
+  text-transform: uppercase;
+  letter-spacing: 0.12em;
+  color: rgba(255, 255, 255, 0.6);
+  margin-bottom: 2px;
 }
 
 .chat-session {
@@ -217,32 +256,62 @@ body {
 
 .chat-log {
   flex: 1;
-  min-height: 180px;
+  min-height: 220px;
-  max-height: 320px;
+  max-height: 420px;
-  margin-bottom: 8px;
+  margin-bottom: 12px;
-  padding: 12px;
+  padding: 16px;
-  border-radius: 10px;
+  border-radius: 16px;
-  background: rgba(3, 16, 32, 0.65);
+  background: rgba(4, 15, 30, 0.8);
   overflow-y: auto;
   display: flex;
   flex-direction: column;
-  gap: 8px;
+  gap: 10px;
+  border: 1px solid rgba(255, 255, 255, 0.05);
 }
 
 .chat-input-row {
   display: flex;
-  gap: 8px;
+  gap: 10px;
+  align-items: center;
+  background: rgba(3, 12, 24, 0.7);
+  border-radius: 22px;
+  padding: 4px 6px 4px 12px;
+  border: 1px solid rgba(255, 255, 255, 0.08);
 }
 
 .chat-input-row .input {
-  flex: 1;
+  flex: 1 1 auto;
+  min-width: 0;
   margin-bottom: 0;
+  border: none;
+  background: transparent;
+  height: 44px;
+  line-height: 44px;
+  padding: 0;
+}
+
+.chat-send-btn {
+  width: 44px;
+  min-width: 44px;
+  height: 44px;
+  padding: 0;
+  border-radius: 14px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: none;
+}
+
+.chat-send-btn .send-icon {
+  width: 18px;
+  height: 18px;
+  fill: currentColor;
 }
 
 .chat-message {
-  padding: 8px 10px;
+  padding: 10px 14px;
-  border-radius: 14px;
+  border-radius: 16px;
-  font-size: 0.9rem;
+  font-size: 1rem;
   max-width: 80%;
 }
 

front_files/index.html

@@ -14,10 +14,13 @@
     <div class="app">
         <header class="app-header">
             <h1 class="logo">Echo</h1>
+            <p class="tagline">Simple peer-to-peer text & files</p>
         </header>
 
         <main class="app-main">
             <section class="card" id="landing-card">
+                <div class="card-heading">Start a secure session</div>
+                <div class="card-subheading">Create a fresh room or join with an invite code.</div>
                 <div class="actions">
                     <button class="btn btn-primary" id="create-session-btn">
                         Create a session
@@ -37,7 +40,10 @@
 
             <section class="card hidden" id="chat-card">
                 <div class="chat-header">
-                    <div class="chat-session" id="chat-session-info"></div>
+                    <div>
+                        <div class="chat-title">Live session</div>
+                        <div class="chat-session" id="chat-session-info"></div>
+                    </div>
                     <button class="btn btn-secondary" id="leave-session-btn">
                         Leave session
                     </button>
@@ -46,9 +52,14 @@
                 <div class="chat-log" id="chat-log"></div>
 
                 <form class="chat-input-row" id="chat-form">
-                    <input type="text" id="chat-input" class="input" placeholder="Type a message..." autocomplete="off" />
+                    <input type="text" id="chat-input" class="input chat-input" placeholder="Type a message..."
-                    <button class="btn btn-primary" id="chat-send-btn">
+                        autocomplete="off" />
-                        Send
+                    <button class="btnx btn-primary chat-send-btn" id="chat-send-btn" aria-label="Send message"
+                        type="submit">
+                        <svg class="send-icon" viewBox="0 0 24 24" aria-hidden="true">
+                            <path
+                                d="M3.4 20.6c-.5.2-.9-.3-.7-.8l3-8.2c.1-.3 0-.7-.2-.9l-3-3.4c-.4-.5 0-1.3.7-1.1l18.5 6.2c.6.2.6 1 0 1.2L3.4 20.6zm3.5-9.3c.7.7 1.1 1.6.9 2.5l-1 3 10.8-4-10.7-3.5z" />
+                        </svg>
                     </button>
                 </form>
             </section>

front_files/index.js

@@ -33,15 +33,20 @@ console.log("Echo mock frontend loaded");
 
   var currentSessionId = null;
   var currentParty = null; // "A" (offerer) or "B" (answerer)
-  var mockConnected = false;
+  var wsConnected = false;
+  var ws = null;
+  var pc = null;
+  var rc = null;
+  var lastSignal = null; // saving the last signal to send it on client connect
+  var dataChannel = null
 
   function setSessionInfo(text) {
     var partyLabel =
       currentParty === "A"
         ? "You are party A (offerer side)"
         : currentParty === "B"
-        ? "You are party B (answerer side)"
+          ? "You are party B (answerer side)"
-        : "";
+          : "";
 
     sessionInfoEl.textContent = partyLabel
       ? text + " · " + partyLabel
@@ -75,7 +80,7 @@ console.log("Echo mock frontend loaded");
   function resetState() {
     currentSessionId = null;
     currentParty = null;
-    mockConnected = false;
+    wsConnected = false;
     setChatInputEnabled(false);
   }
 
@@ -100,53 +105,24 @@ console.log("Echo mock frontend loaded");
       setSessionInfo(
         "Session ID: " + currentSessionId + " (share this with your peer)"
       );
-      appendMessage(
+
-        "system",
-        "Session created. TODO: open a WebSocket for signaling and send an SDP offer."
-      );
     } else {
       setSessionInfo("Joined session: " + currentSessionId);
-      appendMessage(
+
-        "system",
-        "Joined session. TODO: connect to the signaling WebSocket and respond with an SDP answer."
-      );
     }
 
-    appendMessage(
+
-      "system",
-      "Mock mode: no real signaling or WebRTC yet. Everything stays local."
-    );
   }
 
-  function mockConnectP2P() {
-    if (mockConnected) {
-      return;
-    }
 
-    mockConnected = true;
-    setChatInputEnabled(true);
-    appendMessage(
-      "system",
-      "Pretend the RTCDataChannel is open now. Replace this with real WebRTC events."
-    );
-  }
 
   function sendChatMessage(text) {
-    if (!mockConnected) {
+
-      appendMessage(
+
-        "system",
+    dataChannel.send(text)
-        "Mock mode: sending locally. Wire this up to RTCDataChannel.send()."
-      );
-    }
 
     appendMessage("me", text);
 
-    if (!mockConnected) {
-      appendMessage(
-        "them",
-        "(Simulated peer) Replace with your RTCDataChannel onmessage handler."
-      );
-    }
   }
 
   async function createSession() {
@@ -176,11 +152,11 @@ console.log("Echo mock frontend loaded");
 
       appendMessage(
         "system",
-        "TODO: connect to /api/signal/session/" +
+        "Created session"
-          currentSessionId +
-          "/party/A via WebSocket."
       );
-      mockConnectP2P();
+
+      await connectWebSocket()
+
     } catch (err) {
       console.error(err);
       alert(err && err.message ? err.message : "Could not create session.");
@@ -190,7 +166,7 @@ console.log("Echo mock frontend loaded");
     }
   }
 
-  function joinSession() {
+  async function joinSession() {
     var id = sessionIdInput.value.trim();
     if (!id) {
       sessionIdInput.focus();
@@ -201,15 +177,165 @@ console.log("Echo mock frontend loaded");
     currentParty = "B";
     showChat();
 
-    appendMessage(
+    await connectWebSocket()
-      "system",
-      "TODO: connect to /api/signal/session/" +
-        currentSessionId +
-        "/party/B via WebSocket."
-    );
-    mockConnectP2P();
   }
 
+  async function connectWebSocket() {
+    // supporting ws for local testing.
+    var schema = window.location.protocol === "https:" ? "wss:" : "ws:"
+
+    var wsURL = schema + window.location.host +
+
+      "/api/signal/session/" + currentSessionId + "/party/" + currentParty
+
+    ws = new WebSocket(wsURL)
+
+    ws.onopen = () => {
+      appendMessage("system", "Connected to WS")
+
+
+      if (currentParty == "A") {
+        createChannel()
+      } else {
+        sendSignal({ "type": "hello" })
+      }
+    }
+    ws.onmessage = async (event) => {
+      var event_data = event.data
+      console.log("Received from WS", event_data, typeof (event_data))
+      var payload = JSON.parse(event_data)
+      await handleWebSocketEvent(payload)
+    }
+
+
+
+
+  }
+  function sendSignal(payload) {
+    if (!payload) {
+      console.warn("Attempted to send empty signaling payload")
+      return
+    }
+    if (!ws || ws.readyState !== WebSocket.OPEN) {
+      return
+    }
+    try {
+      ws.send(JSON.stringify(payload));
+    } catch (err) {
+      console.error("Failed to send signal", err)
+    }
+  }
+
+  async function handleWebSocketEvent(payload) {
+    console.log("Handling WS Event, payload.type", payload.type, payload, typeof (payload))
+
+    if (payload.type == "offer") {
+      await handleOffer(payload)
+    } else if (payload.type == "hello" && lastSignal) {
+      sendSignal(lastSignal)
+    } else if (payload.type == "answer") {
+      handleAnswer(payload)
+    } else if (payload.type === "candidate" && payload.candidate) {
+      try {
+
+        await pc.addIceCandidate(new RTCIceCandidate(payload.candidate))
+      } catch (err) {
+        console.error("Failed to add remote ICE candidate", err)
+      }
+    }
+  }
+
+  async function handleOffer(offer) {
+    console.log("New offer", offer)
+
+    if (!rc) {
+      rc = new RTCPeerConnection()
+    }
+
+    rc.onicecandidate = e => {
+      console.log(" NEW ice candidate!! reprinting SDP for rc ")
+      console.log("ice candidate", e.candidate)
+      sendSignal({ type: "candidate", candidate: e.candidate })
+    }
+
+
+    rc.ondatachannel = e => {
+
+      const receiveChannel = e.channel;
+      receiveChannel.onmessage = e => {
+        console.log("messsage received!!!" + e.data)
+        appendMessage("them", e.data)
+      }
+      receiveChannel.onopen = e => {
+        console.log("open!!!!")
+        setChatInputEnabled(true)
+      };
+      receiveChannel.onclose = e => {
+        console.log("closed!!!!!!")
+        setChatInputEnabled(false)
+      };
+      rc.channel = receiveChannel;
+
+      dataChannel = receiveChannel
+    }
+
+
+
+    await rc.setRemoteDescription(offer)
+    console.log("Remote description applied")
+
+    var answer = await rc.createAnswer()
+    await rc.setLocalDescription(answer)
+    console.log("Answer", JSON.stringify(rc.localDescription))
+    sendSignal(rc.localDescription)
+    appendMessage("system", "Sent Answer")
+    lastSignal = rc.localDescription
+  }
+
+  function handleAnswer(answer) {
+    pc.setRemoteDescription(answer).then(a => {
+      console.log("Accepted Answer.")
+      appendMessage("system", "Accepted Answer")
+    })
+  }
+
+  function createChannel() {
+    pc = new RTCPeerConnection()
+
+
+    pc.onicecandidate = e => {
+      console.log(" NEW ice candidate!! on pc reprinting SDP ")
+      console.log(JSON.stringify(pc.localDescription))
+      if (pc.localDescription) {
+        sendSignal(pc.localDescription)
+        lastSignal = pc.localDescription
+        appendMessage("system", "Sent Offer")
+      }
+
+    }
+
+
+    const sendChannel = pc.createDataChannel("sendChannel");
+    sendChannel.onmessage = e => {
+      console.log("messsage received!!!" + e.data)
+      appendMessage("them", e.data)
+    }
+    sendChannel.onopen = e => {
+      console.log("open!!!!")
+      setChatInputEnabled(true)
+    };
+    sendChannel.onclose = e => {
+      console.log("closed!!!!!!")
+      setChatInputEnabled(false)
+    };
+
+    dataChannel = sendChannel
+
+
+    pc.createOffer().then(o => pc.setLocalDescription(o))
+  }
+
+
   createBtn.addEventListener("click", function () {
     createSession();
   });

main.go

@@ -7,6 +7,7 @@ import (
 
 func main() {
 	fmt.Println("Hello from echo-echo-cho-o")
+	fmt.Println("Listening to port 8900")
 
-	api.BuildRouter(":8080")
+	api.BuildRouter(":8900")
 }