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/workflow/utils/elk-layout.ts

@@ -1,4 +1,5 @@
 import type { ElkNode, LayoutOptions } from 'elkjs/lib/elk-api'
+import type { HumanInputNodeType } from '@/app/components/workflow/nodes/human-input/types'
 import type { CaseItem, IfElseNodeType } from '@/app/components/workflow/nodes/if-else/types'
 import type {
   Edge,
@@ -345,6 +346,76 @@ const buildIfElseWithPorts = (
   }
 }
 
+/**
+ * Build Human Input node with ELK native Ports for multiple branches
+ * Handles user actions as branches with __timeout as the last fixed branch
+ */
+const buildHumanInputWithPorts = (
+  humanInputNode: Node,
+  edges: Edge[],
+): { node: ElkNodeShape, portMap: Map<string, string> } | null => {
+  const childEdges = edges.filter(edge => edge.source === humanInputNode.id)
+
+  if (childEdges.length <= 1)
+    return null
+
+  // Sort child edges: user actions first (by order), then __timeout last
+  const sortedChildEdges = [...childEdges].sort((edgeA, edgeB) => {
+    const handleA = edgeA.sourceHandle
+    const handleB = edgeB.sourceHandle
+
+    if (handleA && handleB) {
+      const userActions = (humanInputNode.data as HumanInputNodeType).user_actions || []
+      const isATimeout = handleA === '__timeout'
+      const isBTimeout = handleB === '__timeout'
+
+      // __timeout should always be last
+      if (isATimeout)
+        return 1
+      if (isBTimeout)
+        return -1
+
+      // Sort by user_actions order
+      const indexA = userActions.findIndex(action => action.id === handleA)
+      const indexB = userActions.findIndex(action => action.id === handleB)
+
+      if (indexA !== -1 && indexB !== -1)
+        return indexA - indexB
+    }
+
+    return 0
+  })
+
+  // Create ELK ports for each branch
+  const ports: ElkPortShape[] = sortedChildEdges.map((edge, index) => ({
+    id: `${humanInputNode.id}-port-${edge.sourceHandle || index}`,
+    layoutOptions: {
+      'port.side': 'EAST',
+      'port.index': String(index),
+    },
+  }))
+
+  // Build port mapping: edge.id -> portId
+  const portMap = new Map<string, string>()
+  sortedChildEdges.forEach((edge, index) => {
+    const portId = `${humanInputNode.id}-port-${edge.sourceHandle || index}`
+    portMap.set(edge.id, portId)
+  })
+
+  return {
+    node: {
+      id: humanInputNode.id,
+      width: humanInputNode.width ?? DEFAULT_NODE_WIDTH,
+      height: humanInputNode.height ?? DEFAULT_NODE_HEIGHT,
+      ports,
+      layoutOptions: {
+        'elk.portConstraints': 'FIXED_ORDER',
+      },
+    },
+    portMap,
+  }
+}
+
 const normaliseBounds = (layout: LayoutResult): LayoutResult => {
   const {
     nodes,
@@ -388,7 +459,7 @@ export const getLayoutByDagre = async (originNodes: Node[], originEdges: Edge[])
   // Track which edges have been processed for If/Else nodes with ports
   const edgeToPortMap = new Map<string, string>()
 
-  // Build nodes with ports for If/Else nodes
+  // Build nodes with ports for If/Else and Human Input nodes
   nodes.forEach((node) => {
     if (node.data.type === BlockEnum.IfElse) {
       const portsResult = buildIfElseWithPorts(node, edges)
@@ -405,6 +476,21 @@ export const getLayoutByDagre = async (originNodes: Node[], originEdges: Edge[])
         elkNodes.push(toElkNode(node))
       }
     }
+    else if (node.data.type === BlockEnum.HumanInput) {
+      const portsResult = buildHumanInputWithPorts(node, edges)
+      if (portsResult) {
+        // Use node with ports
+        elkNodes.push(portsResult.node)
+        // Store port mappings for edges
+        portsResult.portMap.forEach((portId, edgeId) => {
+          edgeToPortMap.set(edgeId, portId)
+        })
+      }
+      else {
+        // No multiple branches, use normal node
+        elkNodes.push(toElkNode(node))
+      }
+    }
     else {
       elkNodes.push(toElkNode(node))
     }

web/app/components/workflow/utils/workflow.ts

@@ -33,6 +33,7 @@ export const canRunBySingle = (nodeType: BlockEnum, isChildNode: boolean) => {
     || nodeType === BlockEnum.IfElse
     || nodeType === BlockEnum.VariableAggregator
     || nodeType === BlockEnum.Assigner
+    || nodeType === BlockEnum.HumanInput
     || nodeType === BlockEnum.DataSource
     || nodeType === BlockEnum.TriggerSchedule
     || nodeType === BlockEnum.TriggerWebhook