Fix CORS: proxy WebRTC requests through backend

app/main.py

@@ -7,14 +7,18 @@ import logging
 from contextlib import asynccontextmanager
 from typing import AsyncGenerator
 
+import httpx
 import aiomqtt
-from fastapi import FastAPI, Request
+from fastapi import FastAPI, Request, Response
 from fastapi.responses import HTMLResponse, StreamingResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 
 from .config import settings
 
+# HTTP client for proxying to go2rtc
+http_client = httpx.AsyncClient(timeout=10.0)
+
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
@@ -139,6 +143,41 @@ async def events() -> StreamingResponse:
     )
 
 
+@app.post("/api/webrtc")
+async def webrtc_proxy(request: Request, src: str):
+    """Proxy WebRTC offers to go2rtc to avoid CORS issues"""
+    try:
+        body = await request.body()
+        response = await http_client.post(
+            f"http://{settings.GO2RTC_HOST}/api/webrtc?src={src}",
+            content=body,
+            headers={"Content-Type": "application/sdp"}
+        )
+        return Response(
+            content=response.content,
+            status_code=response.status_code,
+            media_type="application/sdp"
+        )
+    except Exception as e:
+        logger.error(f"WebRTC proxy error for {src}: {e}")
+        return Response(content=str(e), status_code=500)
+
+
+@app.get("/api/streams")
+async def streams_proxy():
+    """Proxy streams list from go2rtc"""
+    try:
+        response = await http_client.get(f"http://{settings.GO2RTC_HOST}/api/streams")
+        return Response(
+            content=response.content,
+            status_code=response.status_code,
+            media_type="application/json"
+        )
+    except Exception as e:
+        logger.error(f"Streams proxy error: {e}")
+        return Response(content=str(e), status_code=500)
+
+
 @app.get("/health")
 async def health():
     """Health check endpoint"""