feat: added validate endpoint

src/backend/langflow/api/endpoints.py

@@ -1,10 +1,12 @@
 from typing import Any, Dict
 
 from fastapi import APIRouter, HTTPException
+from langflow.interface.custom_types import PythonFunction
 
 from langflow.interface.run import process_graph
 from langflow.interface.types import build_langchain_types_dict
 
+
 # build router
 router = APIRouter()
 
@@ -20,3 +22,12 @@ def get_load(data: Dict[str, Any]):
         return process_graph(data)
     except Exception as e:
         return HTTPException(status_code=500, detail=str(e))
+
+
+@router.post("/validate", status_code=200)
+def validate_code(data: PythonFunction):
+    try:
+        # if the data var gets here then it is valid python code
+        return {"valid": True}
+    except Exception as e:
+        return HTTPException(status_code=500, detail=str(e))

src/backend/langflow/interface/custom_types.py

@@ -1,16 +1,24 @@
+from typing import Callable
 from langflow.utils import util
 from pydantic import BaseModel, validator
-from langchain.agents import tool
+
 
 
 class Function(BaseModel):
     code: str
 
+    # Eval code and store the function
+    def __init__(self, **data):
+        super().__init__(**data)
+
     # Validate the function
     @validator("code")
     def validate_func(cls, v):
         # Validate with LangChain's tool decorator
-        tool(v)
+        func = util.eval_function(v)
+        if not isinstance(func, Callable):
+            raise ValueError("Function must be a callable")
+
         return v
 
     def get_function(self):