fix: 更换表达式解析引擎为aviator

ruoyi-flowable/pom.xml

@@ -85,11 +85,10 @@
 			<artifactId>spring-boot-starter-websocket</artifactId>
 		</dependency>
 
-		<!-- https://mvnrepository.com/artifact/org.eweb4j/fel -->
 		<dependency>
-			<groupId>org.eweb4j</groupId>
-			<artifactId>fel</artifactId>
-			<version>0.8</version>
+			<groupId>com.googlecode.aviator</groupId>
+			<artifactId>aviator</artifactId>
+			<version>5.3.1</version>
 		</dependency>
 
 	</dependencies>

ruoyi-flowable/src/main/java/com/ruoyi/flowable/flow/FindNextNodeUtil.java

@@ -1,8 +1,10 @@
 package com.ruoyi.flowable.flow;
 
-import com.greenpineyu.fel.FelEngine;
-import com.greenpineyu.fel.FelEngineImpl;
-import com.greenpineyu.fel.context.FelContext;
+import com.googlecode.aviator.AviatorEvaluator;
+import com.googlecode.aviator.Expression;
+//import com.greenpineyu.fel.FelEngine;
+//import com.greenpineyu.fel.FelEngineImpl;
+//import com.greenpineyu.fel.context.FelContext;
 import org.flowable.bpmn.model.Process;
 import org.flowable.bpmn.model.*;
 import org.flowable.engine.RepositoryService;
@@ -67,9 +69,7 @@ public class FindNextNodeUtil {
                 //2.无表达式
                 String expression = sequenceFlow.getConditionExpression();
                 if (expression == null ||
-                        Boolean.parseBoolean(
-                                String.valueOf(
-                                        result(map, expression.substring(expression.lastIndexOf("{") + 1, expression.lastIndexOf("}")))))) {
+                        expressionResult(map, expression.substring(expression.lastIndexOf("{") + 1, expression.lastIndexOf("}")))) {
                     //出线的下一节点
                     String nextFlowElementID = sequenceFlow.getTargetRef();
                     if (checkSubProcess(nextFlowElementID, flowElements, nextUser)) {
@@ -212,19 +212,15 @@ public class FindNextNodeUtil {
     }
 
     /**
-     * 校验el表达示例
+     * 校验el表达式
      *
      * @param map
      * @param expression
      * @return
      */
-    public static Object result(Map<String, Object> map, String expression) {
-        FelEngine fel = new FelEngineImpl();
-        FelContext ctx = fel.getContext();
-        for (Map.Entry<String, Object> entry : map.entrySet()) {
-            ctx.set(entry.getKey(), entry.getValue());
-        }
-        Object result = fel.eval(expression);
-        return result;
+    public static boolean expressionResult(Map<String, Object> map, String expression) {
+        Expression exp = AviatorEvaluator.compile(expression);
+        final Object execute = exp.execute(map);
+        return Boolean.parseBoolean(String.valueOf(execute));
     }
 }

ruoyi-flowable/src/main/java/com/ruoyi/flowable/service/impl/FlowTaskServiceImpl.java

@@ -469,25 +469,29 @@ public class FlowTaskServiceImpl extends FlowServiceFactory implements IFlowTask
         if (CollectionUtils.isEmpty(task)) {
             throw new CustomException("流程未启动或已执行完成，取消申请失败");
         }
-
-        SysUser loginUser = SecurityUtils.getLoginUser().getUser();
+        // 获取当前需撤回的流程实例
         ProcessInstance processInstance =
-                runtimeService.createProcessInstanceQuery().processInstanceId(flowTaskVo.getInstanceId()).singleResult();
+                runtimeService.createProcessInstanceQuery()
+                        .processInstanceId(flowTaskVo.getInstanceId())
+                        .singleResult();
         BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance.getProcessDefinitionId());
         if (Objects.nonNull(bpmnModel)) {
             Process process = bpmnModel.getMainProcess();
             List<EndEvent> endNodes = process.findFlowElementsOfType(EndEvent.class, false);
             if (CollectionUtils.isNotEmpty(endNodes)) {
+                SysUser loginUser = SecurityUtils.getLoginUser().getUser();
                 Authentication.setAuthenticatedUserId(loginUser.getUserId().toString());
 //                taskService.addComment(task.getId(), processInstance.getProcessInstanceId(), FlowComment.STOP.getType(),
 //                        StringUtils.isBlank(flowTaskVo.getComment()) ? "取消申请" : flowTaskVo.getComment());
+                // 获取当前流程最后一个节点
                 String endId = endNodes.get(0).getId();
                 List<Execution> executions =
                         runtimeService.createExecutionQuery().parentId(processInstance.getProcessInstanceId()).list();
                 List<String> executionIds = new ArrayList<>();
                 executions.forEach(execution -> executionIds.add(execution.getId()));
-                runtimeService.createChangeActivityStateBuilder().moveExecutionsToSingleActivityId(executionIds,
-                        endId).changeState();
+                // 变更流程为已结束状态
+                runtimeService.createChangeActivityStateBuilder()
+                        .moveExecutionsToSingleActivityId(executionIds, endId).changeState();
             }
         }
 
@@ -862,10 +866,13 @@ public class FlowTaskServiceImpl extends FlowServiceFactory implements IFlowTask
      */
     @Override
     public AjaxResult getNextFlowNode(FlowTaskVo flowTaskVo) {
+        // Step 1. 获取当前节点并找到下一步节点
         Task task = taskService.createTaskQuery().taskId(flowTaskVo.getTaskId()).singleResult();
         FlowNextDto flowNextDto = new FlowNextDto();
         if (Objects.nonNull(task)) {
-            List<UserTask> nextUserTask = FindNextNodeUtil.getNextUserTasks(repositoryService, task, new HashMap<>());
+            // Step 2. 获取当前流程所有流程变量(网关节点时需要校验表达式)
+            Map<String, Object> variables = taskService.getVariables(task.getId());
+            List<UserTask> nextUserTask = FindNextNodeUtil.getNextUserTasks(repositoryService, task, variables);
             if (CollectionUtils.isNotEmpty(nextUserTask)) {
                 for (UserTask userTask : nextUserTask) {
                     MultiInstanceLoopCharacteristics multiInstance = userTask.getLoopCharacteristics();