Minor fixes

common/script/script-api/src/main/java/org/thingsboard/script/api/AbstractScriptInvokeService.java

@@ -274,7 +274,7 @@ public abstract class AbstractScriptInvokeService implements ScriptInvokeService
 
     private boolean resultSizeExceeded(String result) {
         if (getMaxResultSize() <= 0) return false;
-        return result.length() > getMaxResultSize();
+        return result != null && result.length() > getMaxResultSize();
     }
 
     private <T> ListenableFuture<T> error(String message) {

common/script/script-api/src/main/java/org/thingsboard/script/api/mvel/DefaultMvelInvokeService.java

@@ -25,6 +25,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.mvel2.ExecutionContext;
 import org.mvel2.MVEL;
 import org.mvel2.ParserContext;
+import org.mvel2.SandboxedParserConfiguration;
 import org.mvel2.SandboxedParserContext;
 import org.mvel2.ScriptMemoryOverflowException;
 import org.mvel2.optimizers.OptimizerFactory;
@@ -56,7 +57,7 @@ import java.util.regex.Pattern;
 public class DefaultMvelInvokeService extends AbstractScriptInvokeService implements MvelInvokeService {
 
     protected Map<UUID, MvelScript> scriptMap = new ConcurrentHashMap<>();
-    private ParserContext parserContext;
+    private SandboxedParserConfiguration parserConfig;
 
     private static final Pattern NEW_KEYWORD_PATTERN = Pattern.compile("new\\s");
 
@@ -108,8 +109,9 @@ public class DefaultMvelInvokeService extends AbstractScriptInvokeService implem
     public void init() {
         super.init();
         OptimizerFactory.setDefaultOptimizer(OptimizerFactory.SAFE_REFLECTIVE);
-        parserContext = new SandboxedParserContext();
+        parserConfig = new SandboxedParserConfiguration();
-        parserContext.addImport("JSON", TbJson.class);
+        parserConfig.addImport("JSON", TbJson.class);
+        TbUtils.register(parserConfig);
         executor = MoreExecutors.listeningDecorator(ThingsBoardExecutors.newWorkStealingPool(threadPoolSize, "mvel-executor"));
     }
 
@@ -144,7 +146,7 @@ public class DefaultMvelInvokeService extends AbstractScriptInvokeService implem
         }
         return executor.submit(() -> {
             try {
-                Serializable compiledScript = MVEL.compileExpression(scriptBody, parserContext);
+                Serializable compiledScript = MVEL.compileExpression(scriptBody, new SandboxedParserContext(parserConfig));
                 MvelScript script = new MvelScript(compiledScript, scriptBody, argNames);
                 scriptMap.put(scriptId, script);
                 return scriptId;
@@ -163,9 +165,9 @@ public class DefaultMvelInvokeService extends AbstractScriptInvokeService implem
                 throw new TbScriptException(scriptId, TbScriptException.ErrorCode.OTHER, null, new RuntimeException("Script not found!"));
             }
             try {
-                return MVEL.executeExpression(script.getCompiledScript(), executionContext, script.createVars(args));
+                return MVEL.executeTbExpression(script.getCompiledScript(), executionContext, script.createVars(args));
             } catch (ScriptMemoryOverflowException e) {
-                throw new TbScriptException(scriptId, TbScriptException.ErrorCode.OTHER, script.getScriptBody(), new RuntimeException("Memory error!"));
+                throw new TbScriptException(scriptId, TbScriptException.ErrorCode.OTHER, script.getScriptBody(), new RuntimeException("Script memory overflow!"));
             } catch (Exception e) {
                 throw new TbScriptException(scriptId, TbScriptException.ErrorCode.RUNTIME, script.getScriptBody(), e);
             }

common/script/script-api/src/main/java/org/thingsboard/script/api/mvel/TbUtils.java

@@ -0,0 +1,87 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * 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
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 org.thingsboard.script.api.mvel;
+
+import org.mvel2.ExecutionContext;
+import org.mvel2.ParserConfiguration;
+import org.mvel2.execution.ExecutionArrayList;
+import org.mvel2.util.MethodStub;
+
+import java.io.UnsupportedEncodingException;
+import java.util.Base64;
+import java.util.List;
+
+public class TbUtils {
+
+    public static void register(ParserConfiguration parserConfig) throws Exception {
+        parserConfig.addImport("btoa", new MethodStub(TbUtils.class.getMethod("btoa",
+                String.class)));
+        parserConfig.addImport("atob", new MethodStub(TbUtils.class.getMethod("atob",
+                String.class)));
+        parserConfig.addImport("bytesToString", new MethodStub(TbUtils.class.getMethod("bytesToString",
+                List.class)));
+        parserConfig.addImport("bytesToString", new MethodStub(TbUtils.class.getMethod("bytesToString",
+                List.class, String.class)));
+        parserConfig.addImport("stringToBytes", new MethodStub(TbUtils.class.getMethod("stringToBytes",
+                ExecutionContext.class, String.class)));
+        parserConfig.addImport("stringToBytes", new MethodStub(TbUtils.class.getMethod("stringToBytes",
+                ExecutionContext.class, String.class, String.class)));
+    }
+
+    public static String btoa(String input) {
+        return new String(Base64.getEncoder().encode(input.getBytes()));
+    }
+
+    public static String atob(String encoded) {
+        return new String(Base64.getDecoder().decode(encoded));
+    }
+
+    public static String bytesToString(List<Byte> bytesList) {
+        byte[] bytes = bytesFromList(bytesList);
+        return new String(bytes);
+    }
+
+    public static String bytesToString(List<Byte> bytesList, String charsetName) throws UnsupportedEncodingException {
+        byte[] bytes = bytesFromList(bytesList);
+        return new String(bytes, charsetName);
+    }
+
+    public static List<Byte> stringToBytes(ExecutionContext ctx, String str) {
+        byte[] bytes = str.getBytes();
+        return bytesToList(ctx, bytes);
+    }
+
+    public static List<Byte> stringToBytes(ExecutionContext ctx, String str, String charsetName) throws UnsupportedEncodingException {
+        byte[] bytes = str.getBytes(charsetName);
+        return bytesToList(ctx, bytes);
+    }
+
+    private static byte[] bytesFromList(List<Byte> bytesList) {
+        byte[] bytes = new byte[bytesList.size()];
+        for (int i = 0; i < bytesList.size(); i++) {
+            bytes[i] = bytesList.get(i);
+        }
+        return bytes;
+    }
+
+    private static List<Byte> bytesToList(ExecutionContext ctx, byte[] bytes) {
+        List<Byte> list = new ExecutionArrayList<>(ctx);
+        for (int i = 0; i < bytes.length; i++) {
+            list.add(bytes[i]);
+        }
+        return list;
+    }
+}

pom.xml

@@ -77,7 +77,7 @@
         <zookeeper.version>3.5.5</zookeeper.version>
         <protobuf.version>3.17.2</protobuf.version>
         <grpc.version>1.42.1</grpc.version>
-        <mvel.version>2.4.16TB</mvel.version>
+        <mvel.version>2.4.19TB</mvel.version>
         <lombok.version>1.18.18</lombok.version>
         <paho.client.version>1.2.4</paho.client.version>
         <netty.version>4.1.75.Final</netty.version>

ui-ngx/src/app/shared/components/dialog/node-script-test-dialog.component.html

@@ -77,6 +77,7 @@
               functionName="{{ data.functionName }}"
               [functionArgs]="data.argNames"
               [validationArgs]="[data.msg, data.metadata, data.msgType]"
+              [disableUndefinedCheck]="scriptLang === scriptLanguage.MVEL"
               resultType="object"
               [helpId]="data.helpId"
               [fillHeight]="true">