code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.skywalking.oap.log.analyzer.dsl;
  
  import com.google.common.collect.ImmutableList;
  import groovy.lang.GroovyShell;
  import groovy.transform.CompileStatic;
  import groovy.util.DelegatingScript;
  import java.lang.reflect.Array;
  import java.util.List;
  import java.util.Map;
  import lombok.AccessLevel;
  import lombok.RequiredArgsConstructor;
  import org.apache.skywalking.oap.log.analyzer.dsl.spec.LALDelegatingScript;
  import org.apache.skywalking.oap.log.analyzer.dsl.spec.filter.FilterSpec;
  import org.apache.skywalking.oap.log.analyzer.provider.LogAnalyzerModuleConfig;
  import org.apache.skywalking.oap.meter.analyzer.dsl.registry.ProcessRegistry;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.library.module.ModuleStartException;
  import org.codehaus.groovy.ast.stmt.DoWhileStatement;
  import org.codehaus.groovy.ast.stmt.ForStatement;
  import org.codehaus.groovy.ast.stmt.Statement;
  import org.codehaus.groovy.ast.stmt.WhileStatement;
  import org.codehaus.groovy.control.CompilerConfiguration;
  import org.codehaus.groovy.control.customizers.ASTTransformationCustomizer;
  import org.codehaus.groovy.control.customizers.ImportCustomizer;
  import org.codehaus.groovy.control.customizers.SecureASTCustomizer;
  
  import static java.util.Collections.singletonList;
  import static java.util.Collections.singletonMap;
  
  @RequiredArgsConstructor(access = AccessLevel.PRIVATE)
  public class DSL {
      private final DelegatingScript script;
  
      private final FilterSpec filterSpec;
  
      public static DSL of(final ModuleManager moduleManager,
                           final LogAnalyzerModuleConfig config,
                           final String dsl) throws ModuleStartException {
          final CompilerConfiguration cc = new CompilerConfiguration();
          final ASTTransformationCustomizer customizer =
              new ASTTransformationCustomizer(
                  singletonMap(
                      "extensions",
                      singletonList(LALPrecompiledExtension.class.getName())
                  ),
                  CompileStatic.class
              );
          cc.addCompilationCustomizers(customizer);
          final SecureASTCustomizer secureASTCustomizer = new SecureASTCustomizer();
          secureASTCustomizer.setDisallowedStatements(
              ImmutableList.<Class<? extends Statement>>builder()
                           .add(WhileStatement.class)
                           .add(DoWhileStatement.class)
                           .add(ForStatement.class)
                           .build());
          // noinspection rawtypes
          secureASTCustomizer.setAllowedReceiversClasses(
              ImmutableList.<Class>builder()
                           .add(Object.class)
                           .add(Map.class)
                           .add(List.class)
                           .add(Array.class)
                           .add(String.class)
                           .add(ProcessRegistry.class)
                           .build());
          cc.addCompilationCustomizers(secureASTCustomizer);
          cc.setScriptBaseClass(LALDelegatingScript.class.getName());
  
          ImportCustomizer icz = new ImportCustomizer();
          icz.addImport("ProcessRegistry", ProcessRegistry.class.getName());
          cc.addCompilationCustomizers(icz);
  
          final GroovyShell sh = new GroovyShell(cc);
          final DelegatingScript script = (DelegatingScript) sh.parse(dsl);
          final FilterSpec filterSpec = new FilterSpec(moduleManager, config);
          script.setDelegate(filterSpec);
  
          return new DSL(script, filterSpec);
      }
  
      public void bind(final Binding binding) {
          this.filterSpec.bind(binding);
      }
  
      public void evaluate() {
          script.run();
      }
  }
  