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agents-flex-core/src/main/java/com/agentsflex/core/util/JsConditionUtil.java

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+/*
+ *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package com.agentsflex.core.util;
+
+import com.agentsflex.core.chain.Chain;
+import com.agentsflex.core.util.graalvm.JsInteropUtils;
+import org.graalvm.polyglot.Context;
+import org.graalvm.polyglot.HostAccess;
+import org.graalvm.polyglot.Value;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class JsConditionUtil {
+
+    // 使用 Context.Builder 构建上下文，线程安全
+    private static final Context.Builder CONTEXT_BUILDER = Context.newBuilder("js")
+        .option("engine.WarnInterpreterOnly", "false")
+        .allowHostAccess(HostAccess.ALL)       // 允许访问 Java 对象的方法和字段
+        .allowHostClassLookup(className -> false) // 禁止动态加载任意 Java 类
+        .option("js.ecmascript-version", "2021");  // 使用较新的 ECMAScript 版本
+
+    /**
+     * 执行 JavaScript 表达式并返回 boolean 结果
+     *
+     * @param code    JS 表达式（应返回布尔或可转换为布尔的值）
+     * @param chain   Chain 上下文对象
+     * @param initMap 初始变量映射
+     * @return true 表示满足条件，继续执行；false 表示跳过
+     */
+    public static boolean eval(String code, Chain chain, Map<String, Object> initMap) {
+        try (Context context = CONTEXT_BUILDER.build()) {
+            Map<String, Object> _result = new HashMap<>();
+            Value bindings = context.getBindings("js");
+
+            // 合并上下文变量
+            Map<String, Object> contextVariables = collectContextVariables(chain, initMap);
+            contextVariables.forEach((key, value) -> {
+                bindings.putMember(key, JsInteropUtils.wrapJavaValueForJS(context, value));
+            });
+
+            bindings.putMember("_result", _result);
+            code = "_result.value = " + code;
+
+            context.eval("js", code);
+            Object value = _result.get("value");
+            return toBoolean(value);
+        } catch (Exception e) {
+            throw new RuntimeException("JavaScript 执行失败: " + e.getMessage(), e);
+        }
+    }
+
+    /**
+     * 收集上下文中的变量
+     */
+    private static Map<String, Object> collectContextVariables(Chain chain, Map<String, Object> initMap) {
+        Map<String, Object> variables = new ConcurrentHashMap<>();
+
+        // 添加 Chain Memory 中的变量（去掉前缀）
+        chain.getMemory().getAll().forEach((key, value) -> {
+            int dotIndex = key.indexOf(".");
+            String varName = (dotIndex >= 0) ? key.substring(dotIndex + 1) : key;
+            variables.put(varName, value);
+        });
+
+        // 添加 _chain 和 initMap 变量
+        variables.putAll(initMap);
+
+        return variables;
+    }
+
+    /**
+     * 将任意对象转换为布尔值
+     */
+    private static boolean toBoolean(Object value) {
+        if (value == null) {
+            return false;
+        }
+        if (value instanceof Boolean) {
+            return (Boolean) value;
+        }
+        if (value instanceof Number) {
+            return ((Number) value).intValue() != 0;
+        }
+        if (value instanceof String) {
+            String str = ((String) value).trim().toLowerCase();
+            return !str.isEmpty() && !"0".equals(str) && !"false".equals(str);
+        }
+        if (value instanceof Value) {
+            Value v = (Value) value;
+            if (v.isBoolean()) {
+                return v.asBoolean();
+            } else if (v.isNumber()) {
+                return v.asDouble() != 0;
+            } else if (v.isString()) {
+                String str = v.asString().trim().toLowerCase();
+                return !str.isEmpty() && !"0".equals(str) && !"false".equals(str);
+            } else {
+                return !v.isNull();
+            }
+        }
+        return true;
+    }
+
+}