Add DEMO feature to the project

gateway/app/routes/demo.py

@@ -0,0 +1,61 @@
+"""
+Demo Session Routes - Proxy to demo-session service
+"""
+
+from fastapi import APIRouter, Request, HTTPException
+from fastapi.responses import JSONResponse
+import httpx
+import structlog
+
+from app.core.config import settings
+
+logger = structlog.get_logger()
+
+router = APIRouter()
+
+
+@router.api_route("/demo/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
+async def proxy_demo_service(path: str, request: Request):
+    """
+    Proxy all demo requests to the demo-session service
+    These endpoints are public and don't require authentication
+    """
+    # Build the target URL
+    demo_service_url = settings.DEMO_SESSION_SERVICE_URL.rstrip('/')
+    target_url = f"{demo_service_url}/api/demo/{path}"
+
+    # Get request body
+    body = None
+    if request.method in ["POST", "PUT", "PATCH"]:
+        body = await request.body()
+
+    # Forward headers (excluding host)
+    headers = {
+        key: value
+        for key, value in request.headers.items()
+        if key.lower() not in ["host", "content-length"]
+    }
+
+    try:
+        async with httpx.AsyncClient(timeout=30.0) as client:
+            response = await client.request(
+                method=request.method,
+                url=target_url,
+                headers=headers,
+                params=request.query_params,
+                content=body
+            )
+
+            # Return the response
+            return JSONResponse(
+                content=response.json() if response.content else {},
+                status_code=response.status_code,
+                headers=dict(response.headers)
+            )
+
+    except httpx.RequestError as e:
+        logger.error("Failed to proxy to demo-session service", error=str(e), url=target_url)
+        raise HTTPException(status_code=503, detail="Demo service unavailable")
+    except Exception as e:
+        logger.error("Unexpected error proxying to demo-session service", error=str(e))
+        raise HTTPException(status_code=500, detail="Internal server error")