content: /*
   * 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.kafka.connect.util;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.ObjectInputStream;
  import java.io.ObjectStreamClass;
  import java.util.Set;
  
  public class SafeObjectInputStream extends ObjectInputStream {
  
      protected static final Set<String> DEFAULT_NO_DESERIALIZE_CLASS_NAMES = Set.of(
              "org.apache.commons.collections.functors.InvokerTransformer",
              "org.apache.commons.collections.functors.InstantiateTransformer",
              "org.apache.commons.collections4.functors.InvokerTransformer",
              "org.apache.commons.collections4.functors.InstantiateTransformer",
              "org.codehaus.groovy.runtime.ConvertedClosure",
              "org.codehaus.groovy.runtime.MethodClosure",
              "org.springframework.beans.factory.ObjectFactory",
              "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl",
              "org.apache.xalan.xsltc.trax.TemplatesImpl"
      );
  
      public SafeObjectInputStream(InputStream in) throws IOException {
          super(in);
      }
  
      @Override
      protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
          String name = desc.getName();
  
          if (isBlocked(name)) {
              throw new SecurityException("Illegal type to deserialize: prevented for security reasons");
          }
  
          return super.resolveClass(desc);
      }
  
      private boolean isBlocked(String name) {
          for (String list : DEFAULT_NO_DESERIALIZE_CLASS_NAMES) {
              if (name.endsWith(list)) {
                  return true;
              }
          }
  
          return false;
      }
  }
  