feat: add payload validation, update Simple API Test fixture, run tests (#2664)

src/backend/base/langflow/api/v1/endpoints.py

@@ -23,6 +23,7 @@ from langflow.api.v1.schemas import (
 )
 from langflow.custom.custom_component.component import Component
 from langflow.custom.utils import build_custom_component_template, get_instance_name
+from langflow.exceptions.api import InvalidChatInputException
 from langflow.graph.graph.base import Graph
 from langflow.graph.schema import RunOutputs
 from langflow.helpers.flow import get_flow_by_id_or_endpoint_name
@@ -75,12 +76,40 @@ async def get_all(
         raise HTTPException(status_code=500, detail=str(exc)) from exc
 
 
+def validate_input_and_tweaks(input_request: SimplifiedAPIRequest):
+    # If the input_value is not None and the input_type is "chat"
+    # then we need to check the tweaks if the ChatInput component is present
+    # and if its input_value is not None
+    # if so, we raise an error
+    if input_request.tweaks is None:
+        return
+    for key, value in input_request.tweaks.items():
+        if "ChatInput" in key or "Chat Input" in key:
+            if isinstance(value, dict):
+                has_input_value = value.get("input_value") is not None
+                input_value_is_chat = input_request.input_value is not None and input_request.input_type == "chat"
+                if has_input_value and input_value_is_chat:
+                    raise InvalidChatInputException(
+                        "If you pass an input_value to the chat input, you cannot pass a tweak with the same name."
+                    )
+        elif "Text Input" in key or "TextInput" in key:
+            if isinstance(value, dict):
+                has_input_value = value.get("input_value") is not None
+                input_value_is_text = input_request.input_value is not None and input_request.input_type == "text"
+                if has_input_value and input_value_is_text:
+                    raise InvalidChatInputException(
+                        "If you pass an input_value to the text input, you cannot pass a tweak with the same name."
+                    )
+
+
 async def simple_run_flow(
     flow: Flow,
     input_request: SimplifiedAPIRequest,
     stream: bool = False,
     api_key_user: Optional[User] = None,
 ):
+    if input_request.input_value is not None and input_request.tweaks is not None:
+        validate_input_and_tweaks(input_request)
     try:
         task_result: List[RunOutputs] = []
         user_id = api_key_user.id if api_key_user else None
@@ -232,6 +261,9 @@ async def simplified_run_flow(
         else:
             logger.exception(exc)
             raise HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(exc)) from exc
+    except InvalidChatInputException as exc:
+        logger.error(exc)
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc
     except Exception as exc:
         logger.exception(exc)
         background_tasks.add_task(

src/backend/base/langflow/api/v1/schemas.py

@@ -303,7 +303,7 @@ class InputValueRequest(BaseModel):
 
 
 class SimplifiedAPIRequest(BaseModel):
-    input_value: Optional[str] = Field(default="", description="The input value")
+    input_value: Optional[str] = Field(default=None, description="The input value")
     input_type: Optional[InputType] = Field(default="chat", description="The input type")
     output_type: Optional[OutputType] = Field(default="chat", description="The output type")
     output_component: Optional[str] = Field(

src/backend/base/langflow/components/inputs/ChatInput.py

@@ -24,6 +24,7 @@ class ChatInput(ChatComponent):
             display_name="Store Messages",
             info="Store the message in the history.",
             value=True,
+            advanced=True,
         ),
         DropdownInput(
             name="sender",

src/backend/base/langflow/components/outputs/ChatOutput.py

@@ -22,6 +22,7 @@ class ChatOutput(ChatComponent):
             display_name="Store Messages",
             info="Store the message in the history.",
             value=True,
+            advanced=True,
         ),
         DropdownInput(
             name="sender",

src/backend/base/langflow/exceptions/api.py

@@ -0,0 +1,2 @@
+class InvalidChatInputException(Exception):
+    pass