AI rule node: add JSON Schema to rule node config

common/util/pom.xml

@@ -114,7 +114,10 @@
         <dependency>
             <groupId>net.objecthunter</groupId>
             <artifactId>exp4j</artifactId>
-            <version>${exp4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.networknt</groupId>
+            <artifactId>json-schema-validator</artifactId>
         </dependency>
     </dependencies>
 

common/util/src/main/java/org/thingsboard/common/util/JsonSchemaUtils.java

@@ -0,0 +1,47 @@
+/**
+ * Copyright © 2016-2025 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.common.util;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.networknt.schema.JsonSchemaFactory;
+import com.networknt.schema.SchemaId;
+import com.networknt.schema.SchemaLocation;
+import com.networknt.schema.SpecVersion;
+import com.networknt.schema.ValidationMessage;
+
+import java.util.Set;
+
+public final class JsonSchemaUtils {
+
+    private JsonSchemaUtils() {
+        throw new AssertionError("Can't instantiate utility class");
+    }
+
+    /**
+     * Validates that the provided JsonNode is a valid JSON Schema (Draft 2020-12).
+     *
+     * @param schemaNode the JSON Schema document as a JsonNode
+     * @return true if the schema is well-formed, false otherwise
+     */
+    public static boolean isValidJsonSchema(JsonNode schemaNode) {
+        Set<ValidationMessage> errors = JsonSchemaFactory
+                .getInstance(SpecVersion.VersionFlag.V202012)
+                .getSchema(SchemaLocation.of(SchemaId.V202012))
+                .validate(schemaNode);
+        return errors.isEmpty();
+    }
+
+}

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/ai/TbAiNodeConfiguration.java

@@ -15,9 +15,12 @@
  */
 package org.thingsboard.rule.engine.ai;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import jakarta.validation.constraints.AssertTrue;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import lombok.Data;
+import org.thingsboard.common.util.JsonSchemaUtils;
 import org.thingsboard.rule.engine.api.NodeConfiguration;
 import org.thingsboard.server.common.data.id.AiSettingsId;
 import org.thingsboard.server.common.data.validation.Length;
@@ -36,15 +39,22 @@ public class TbAiNodeConfiguration implements NodeConfiguration<TbAiNodeConfigur
     @Length(min = 1, max = 1000)
     private String userPrompt;
 
+    private JsonNode jsonSchema;
+
+    @AssertTrue(message = "provided JSON Schema must conform to the Draft 2020-12 meta-schema")
+    public boolean isJsonSchemaValid() {
+        return jsonSchema == null || JsonSchemaUtils.isValidJsonSchema(jsonSchema);
+    }
+
     @Override
     public TbAiNodeConfiguration defaultConfiguration() {
         var configuration = new TbAiNodeConfiguration();
         configuration.setSystemPrompt("""
-            Take a deep breath and work on this step by step.
-            You are an industry-leading IoT domain expert with deep experience in telemetry data analysis.
-            Your task is to complete the user-provided task or answer a question.
-            You may use additional context information called "Rule engine message payload", "Rule engine message metadata" and "Rule engine message type".
-            Your response must be in JSON format.""");
+                Take a deep breath and work on this step by step.
+                You are an industry-leading IoT domain expert with deep experience in telemetry data analysis.
+                Your task is to complete the user-provided task or answer a question.
+                You may use additional context information called "Rule engine message payload", "Rule engine message metadata" and "Rule engine message type".
+                Your response must be in JSON format.""");
         configuration.setUserPrompt("Tell me a joke");
         return configuration;
     }