From fa1b892c78a7ee42a8934c2321f34b2f5cb4c0ba Mon Sep 17 00:00:00 2001
From: Craig Dennis <craigsdennis@gmail.com>
Date: Tue, 4 Feb 2025 22:33:29 -0800
Subject: [PATCH] Moves to use ephemeral tokens

---
 public/script.js | 40 ++++++++++++++++++++++++----------------
 src/index.ts     | 40 +++++++++++++++++-----------------------
 2 files changed, 41 insertions(+), 39 deletions(-)

diff --git a/public/script.js b/public/script.js
index 1a0b7d6..f82db03 100644
--- a/public/script.js
+++ b/public/script.js
@@ -36,7 +36,7 @@ peerConnection.ontrack = (event) => {
 	document.body.appendChild(el);
 };
 
-const dataChannel = peerConnection.createDataChannel('response');
+const dataChannel = peerConnection.createDataChannel('oai-events');
 
 function configureData() {
 	console.log('Configuring data channel');
@@ -137,22 +137,30 @@ navigator.mediaDevices.getUserMedia({ audio: true }).then((stream) => {
 
 	peerConnection.createOffer().then((offer) => {
 		peerConnection.setLocalDescription(offer);
+		fetch('/session')
+			.then((tokenResponse) => tokenResponse.json())
+			.then((data) => {
+				const EPHEMERAL_KEY = data.result.client_secret.value;
+				const baseUrl = 'https://api.openai.com/v1/realtime';
+				const model = 'gpt-4o-realtime-preview-2024-12-17';
+				fetch(`${baseUrl}?model=${model}`, {
+					method: 'POST',
+					body: offer.sdp,
+					headers: {
+						Authorization: `Bearer ${EPHEMERAL_KEY}`,
+						'Content-Type': 'application/sdp',
+					},
+				})
+					.then((r) => r.text())
+					.then((answer) => {
+						// Accept answer from Realtime WebRTC API
+						peerConnection.setRemoteDescription({
+							sdp: answer,
+							type: 'answer',
+						});
+					});
+			});
 
 		// Send WebRTC Offer to Workers Realtime WebRTC API Relay
-		fetch('/rtc-connect', {
-			method: 'POST',
-			body: offer.sdp,
-			headers: {
-				'Content-Type': 'application/sdp',
-			},
-		})
-			.then((r) => r.text())
-			.then((answer) => {
-				// Accept answer from Realtime WebRTC API
-				peerConnection.setRemoteDescription({
-					sdp: answer,
-					type: 'answer',
-				});
-			});
 	});
 });
diff --git a/src/index.ts b/src/index.ts
index daffba6..71a780e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,37 +1,31 @@
 import { Hono } from 'hono';
+import { cors } from 'hono/cors';
 
 const app = new Hono<{ Bindings: Env }>();
+app.use(cors());
 
 const DEFAULT_INSTRUCTIONS = `You are helpful and have some tools installed.
 
 In the tools you have the ability to control a robot hand.
 `;
 
-app.post('/rtc-connect', async (c) => {
-	const body = await c.req.text();
-	const url = new URL('https://api.openai.com/v1/realtime');
-	url.searchParams.set('model', 'gpt-4o-realtime-preview-2024-12-17');
-	url.searchParams.set('instructions', DEFAULT_INSTRUCTIONS);
-	url.searchParams.set('voice', 'ash');
-
-	const response = await fetch(url.toString(), {
-		method: 'POST',
-		body,
+// Learn more: https://platform.openai.com/docs/api-reference/realtime-sessions/create
+app.get('/session', async (c) => {
+	const response = await fetch("https://api.openai.com/v1/realtime/sessions", {
+		method: "POST",
 		headers: {
-			Authorization: `Bearer ${c.env.OPENAI_API_KEY}`,
-			'Content-Type': 'application/sdp',
+		  "Authorization": `Bearer ${c.env.OPENAI_API_KEY}`,
+		  "Content-Type": "application/json",
 		},
-	});
-
-	if (!response.ok) {
-		throw new Error(`OpenAI API error: ${response.status}`);
-	}
-	const sdp = await response.text();
-	return c.body(sdp, {
-		headers: {
-			'Content-Type': 'application/sdp',
-		},
-	});
+		body: JSON.stringify({
+		  model: "gpt-4o-realtime-preview-2024-12-17",
+		  instructions: DEFAULT_INSTRUCTIONS,
+		  voice: "ash",
+		}),
+	  });
+	  const result = await response.json();
+	  return c.json({result});
 });
 
+
 export default app;