feat: Human Input Node (#32060)

The frontend and backend implementation for the human input node.

Co-authored-by: twwu <twwu@dify.ai>
Co-authored-by: JzoNg <jzongcode@gmail.com>
Co-authored-by: yyh <92089059+lyzno1@users.noreply.github.com>
Co-authored-by: zhsama <torvalds@linux.do>

api/core/workflow/node_events/__init__.py

@@ -13,6 +13,8 @@ from .loop import (
     LoopSucceededEvent,
 )
 from .node import (
+    HumanInputFormFilledEvent,
+    HumanInputFormTimeoutEvent,
     ModelInvokeCompletedEvent,
     PauseRequestedEvent,
     RunRetrieverResourceEvent,
@@ -23,6 +25,8 @@ from .node import (
 
 __all__ = [
     "AgentLogEvent",
+    "HumanInputFormFilledEvent",
+    "HumanInputFormTimeoutEvent",
     "IterationFailedEvent",
     "IterationNextEvent",
     "IterationStartedEvent",

api/core/workflow/node_events/node.py

@@ -47,3 +47,19 @@ class StreamCompletedEvent(NodeEventBase):
 
 class PauseRequestedEvent(NodeEventBase):
     reason: PauseReason = Field(..., description="pause reason")
+
+
+class HumanInputFormFilledEvent(NodeEventBase):
+    """Event emitted when a human input form is submitted."""
+
+    node_title: str
+    rendered_content: str
+    action_id: str
+    action_text: str
+
+
+class HumanInputFormTimeoutEvent(NodeEventBase):
+    """Event emitted when a human input form times out."""
+
+    node_title: str
+    expiration_time: datetime