Create app.py

app.py

@@ -0,0 +1,82 @@
+from fastapi import FastAPI, Request
+from fastapi.responses import JSONResponse, StreamingResponse
+import httpx
+import json
+import uuid
+
+app = FastAPI()
+
+TARGET = "https://api.stack-ai.com/projects/699674cff2af4ce0b6865ca3/chat/assistant"
+API_KEY = "910a861f-6fd7-4c8e-b91b-6281ff0083d0"
+
+
+@app.post("/v1/chat/completions")
+async def chat_completions(req: Request):
+    body = await req.json()
+
+    messages = body.get("messages", [])
+    stream = body.get("stream", False)
+
+    # Extract last user message
+    user_msg = ""
+    for m in reversed(messages):
+        if m["role"] == "user":
+            user_msg = m["content"]
+            break
+
+    stack_payload = {
+        "new_message_id": str(uuid.uuid4()),
+        "parent_message_id": str(uuid.uuid4()),
+        "user_id": "openai_proxy",
+        "message": user_msg,
+        "attachments": [],
+        "conversation_id": str(uuid.uuid4()),
+        "stream": stream,
+        "is_client_side_generated_conversation_id": False,
+        "additional_inputs": {}
+    }
+
+    headers = {
+        "x-api-key": API_KEY,
+        "content-type": "application/json"
+    }
+
+    async with httpx.AsyncClient(timeout=120) as client:
+
+        if stream:
+
+            async def event_stream():
+                async with client.stream("POST", TARGET, json=stack_payload, headers=headers) as r:
+                    async for chunk in r.aiter_text():
+                        yield chunk
+
+            return StreamingResponse(event_stream(), media_type="text/event-stream")
+
+        else:
+            r = await client.post(TARGET, json=stack_payload, headers=headers)
+            data = r.json()
+
+    # Convert to OpenAI format
+    response_text = ""
+
+    try:
+        response_text = data["choices"][0]["message"]["content"]
+    except:
+        response_text = str(data)
+
+    return JSONResponse({
+        "id": "chatcmpl-proxy",
+        "object": "chat.completion",
+        "created": 0,
+        "model": "stack-ai",
+        "choices": [
+            {
+                "index": 0,
+                "message": {
+                    "role": "assistant",
+                    "content": response_text
+                },
+                "finish_reason": "stop"
+            }
+        ]
+    })