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>

web/app/components/base/chat/embedded-chatbot/chat-wrapper.tsx

@@ -2,6 +2,7 @@ import type { FileEntity } from '../../file-uploader/types'
 import type {
   ChatConfig,
   ChatItem,
+  ChatItemInTree,
   OnSend,
 } from '../types'
 import { useCallback, useEffect, useMemo, useState } from 'react'
@@ -17,7 +18,9 @@ import {
   fetchSuggestedQuestions,
   getUrl,
   stopChatMessageResponding,
+  submitHumanInputForm,
 } from '@/service/share'
+import { submitHumanInputForm as submitHumanInputFormService } from '@/service/workflow'
 import { TransferMethod } from '@/types/app'
 import { cn } from '@/utils/classnames'
 import Avatar from '../../avatar'
@@ -70,9 +73,9 @@ const ChatWrapper = () => {
   }, [appParams, currentConversationItem?.introduction])
   const {
     chatList,
-    setTargetMessageId,
     handleSend,
     handleStop,
+    handleSwitchSibling,
     isResponding: respondingState,
     suggestedQuestions,
   } = useChat(
@@ -130,6 +133,40 @@ const ChatWrapper = () => {
     setIsResponding(respondingState)
   }, [respondingState, setIsResponding])
 
+  // Resume paused workflows when chat history is loaded
+  useEffect(() => {
+    if (!appPrevChatList || appPrevChatList.length === 0)
+      return
+
+    // Find the last answer item with workflow_run_id that needs resumption (DFS - find deepest first)
+    let lastPausedNode: ChatItemInTree | undefined
+    const findLastPausedWorkflow = (nodes: ChatItemInTree[]) => {
+      nodes.forEach((node) => {
+        // DFS: recurse to children first
+        if (node.children && node.children.length > 0)
+          findLastPausedWorkflow(node.children)
+
+        // Track the last node with humanInputFormDataList
+        if (node.isAnswer && node.workflow_run_id && node.humanInputFormDataList && node.humanInputFormDataList.length > 0)
+          lastPausedNode = node
+      })
+    }
+
+    findLastPausedWorkflow(appPrevChatList)
+
+    // Only resume the last paused workflow
+    if (lastPausedNode) {
+      handleSwitchSibling(
+        lastPausedNode.id,
+        {
+          onGetSuggestedQuestions: responseItemId => fetchSuggestedQuestions(responseItemId, appSourceType, appId),
+          onConversationComplete: currentConversationId ? undefined : handleNewConversationCompleted,
+          isPublicAPI: appSourceType === AppSourceType.webApp,
+        },
+      )
+    }
+  }, [])
+
   const doSend: OnSend = useCallback((message, files, isRegenerate = false, parentAnswer: ChatItem | null = null) => {
     const data: any = {
       query: message,
@@ -147,7 +184,7 @@ const ChatWrapper = () => {
         isPublicAPI: appSourceType === AppSourceType.webApp,
       },
     )
-  }, [currentConversationId, currentConversationInputs, newConversationInputs, chatList, handleSend, isInstalledApp, appId, handleNewConversationCompleted])
+  }, [currentConversationId, currentConversationInputs, newConversationInputs, chatList, handleSend, appSourceType, appId, handleNewConversationCompleted])
 
   const doRegenerate = useCallback((chatItem: ChatItem, editedQuestion?: { message: string, files?: FileEntity[] }) => {
     const question = editedQuestion ? chatItem : chatList.find(item => item.id === chatItem.parentMessageId)!
@@ -155,6 +192,14 @@ const ChatWrapper = () => {
     doSend(editedQuestion ? editedQuestion.message : question.content, editedQuestion ? editedQuestion.files : question.message_files, true, isValidGeneratedAnswer(parentAnswer) ? parentAnswer : null)
   }, [chatList, doSend])
 
+  const doSwitchSibling = useCallback((siblingMessageId: string) => {
+    handleSwitchSibling(siblingMessageId, {
+      onGetSuggestedQuestions: responseItemId => fetchSuggestedQuestions(responseItemId, appSourceType, appId),
+      onConversationComplete: currentConversationId ? undefined : handleNewConversationCompleted,
+      isPublicAPI: appSourceType === AppSourceType.webApp,
+    })
+  }, [handleSwitchSibling, appSourceType, appId, currentConversationId, handleNewConversationCompleted])
+
   const messageList = useMemo(() => {
     if (currentConversationId || chatList.length > 1)
       return chatList
@@ -178,6 +223,13 @@ const ChatWrapper = () => {
     }
   }, [inputsForms.length, isMobile, currentConversationId, collapsed, allInputsHidden])
 
+  const handleSubmitHumanInputForm = useCallback(async (formToken: string, formData: any) => {
+    if (isInstalledApp)
+      await submitHumanInputFormService(formToken, formData)
+    else
+      await submitHumanInputForm(formToken, formData)
+  }, [isInstalledApp])
+
   const welcome = useMemo(() => {
     const welcomeMessage = chatList.find(item => item.isOpeningStatement)
     if (respondingState)
@@ -223,7 +275,7 @@ const ChatWrapper = () => {
         </div>
       </div>
     )
-  }, [appData?.site, chatList, collapsed, currentConversationId, inputsForms.length, respondingState, allInputsHidden])
+  }, [chatList, respondingState, currentConversationId, collapsed, inputsForms.length, allInputsHidden, appData?.site, isMobile])
 
   const answerIcon = isDify()
     ? <LogoAvatar className="relative shrink-0" />
@@ -253,6 +305,7 @@ const ChatWrapper = () => {
       inputsForm={inputsForms}
       onRegenerate={doRegenerate}
       onStopResponding={handleStop}
+      onHumanInputFormSubmit={handleSubmitHumanInputForm}
       chatNode={(
         <>
           {chatNode}
@@ -266,7 +319,7 @@ const ChatWrapper = () => {
       answerIcon={answerIcon}
       hideProcessDetail
       themeBuilder={themeBuilder}
-      switchSibling={siblingMessageId => setTargetMessageId(siblingMessageId)}
+      switchSibling={doSwitchSibling}
       inputDisabled={inputDisabled}
       questionIcon={
         initUserVariables?.avatar_url