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/configs/feature/__init__.py

@@ -1,3 +1,4 @@
+from datetime import timedelta
 from enum import StrEnum
 from typing import Literal
 
@@ -48,6 +49,16 @@ class SecurityConfig(BaseSettings):
         default=5,
     )
 
+    WEB_FORM_SUBMIT_RATE_LIMIT_MAX_ATTEMPTS: PositiveInt = Field(
+        description="Maximum number of web form submissions allowed per IP within the rate limit window",
+        default=30,
+    )
+
+    WEB_FORM_SUBMIT_RATE_LIMIT_WINDOW_SECONDS: PositiveInt = Field(
+        description="Time window in seconds for web form submission rate limiting",
+        default=60,
+    )
+
     LOGIN_DISABLED: bool = Field(
         description="Whether to disable login checks",
         default=False,
@@ -82,6 +93,12 @@ class AppExecutionConfig(BaseSettings):
         default=0,
     )
 
+    HUMAN_INPUT_GLOBAL_TIMEOUT_SECONDS: PositiveInt = Field(
+        description="Maximum seconds a workflow run can stay paused waiting for human input before global timeout.",
+        default=int(timedelta(days=7).total_seconds()),
+        ge=1,
+    )
+
 
 class CodeExecutionSandboxConfig(BaseSettings):
     """
@@ -1134,6 +1151,14 @@ class CeleryScheduleTasksConfig(BaseSettings):
         description="Enable queue monitor task",
         default=False,
     )
+    ENABLE_HUMAN_INPUT_TIMEOUT_TASK: bool = Field(
+        description="Enable human input timeout check task",
+        default=True,
+    )
+    HUMAN_INPUT_TIMEOUT_TASK_INTERVAL: PositiveInt = Field(
+        description="Human input timeout check interval in minutes",
+        default=1,
+    )
     ENABLE_CHECK_UPGRADABLE_PLUGIN_TASK: bool = Field(
         description="Enable check upgradable plugin task",
         default=True,