✨ #5779 【需求】审批部门负责人，自动根据发起人关联，不需要手动选择

(cherry picked from commit cc9e157f387cf183ecd6ca2d11a7d901a20f8bed)

pigx-flow/pigx-flow-engine/pigx-flow-engine-biz/src/main/java/com/pig4cloud/pigx/flow/engine/node/impl/AssignUserLeaderStrategyImpl.java

@@ -1,7 +1,9 @@
 package com.pig4cloud.pigx.flow.engine.node.impl;
 
+import cn.hutool.core.collection.CollUtil;
 import com.pig4cloud.pigx.admin.api.feign.RemoteDeptService;
 import com.pig4cloud.pigx.common.core.util.R;
+import com.pig4cloud.pigx.common.security.util.SecurityUtils;
 import com.pig4cloud.pigx.flow.engine.node.AssignUserStrategy;
 import com.pig4cloud.pigx.flow.task.constant.ProcessInstanceConstant;
 import com.pig4cloud.pigx.flow.task.dto.Node;
@@ -9,6 +11,7 @@ import com.pig4cloud.pigx.flow.task.dto.NodeUser;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Function;
@@ -26,17 +29,23 @@ import java.util.stream.Stream;
 @Component(ProcessInstanceConstant.AssignedTypeClass.LEADER + "AssignUserStrategy")
 public class AssignUserLeaderStrategyImpl implements AssignUserStrategy {
 
-	private final RemoteDeptService deptService;
+    private final RemoteDeptService deptService;
 
-	@Override
-	public List<Long> handle(Node node, NodeUser rootUser, Map<String, Object> variables) {
-		// 获取部门ID
-		return node.getNodeUserList()
-			.stream()
-			.map(nodeUser -> deptService.getAllDeptLeader(nodeUser.getId()))
-			.flatMap((Function<R<List<Long>>, Stream<Long>>) listR -> listR.getData() == null ? null
-					: listR.getData().stream())
-			.collect(Collectors.toList());
-	}
+    @Override
+    public List<Long> handle(Node node, NodeUser rootUser, Map<String, Object> variables) {
+        // 如果节点没有设置部门主管，则默认为当前用户的部门主管
+        if (CollUtil.isEmpty(node.getNodeUserList())) {
+            List<NodeUser> nodeUserList = new ArrayList<>();
+            nodeUserList.add(NodeUser.builder().id(SecurityUtils.getUser().getDeptId()).build());
+            node.setNodeUserList(nodeUserList);
+        }
+
+        return node.getNodeUserList()
+                .stream()
+                .map(nodeUser -> deptService.getAllDeptLeader(nodeUser.getId()))
+                .flatMap((Function<R<List<Long>>, Stream<Long>>) listR -> listR.getData() == null ? null
+                        : listR.getData().stream())
+                .collect(Collectors.toList());
+    }
 
 }