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.bigtop.manager.dao.interceptor;
  
  import org.apache.bigtop.manager.common.utils.ClassUtils;
  import org.apache.bigtop.manager.dao.annotations.CreateBy;
  import org.apache.bigtop.manager.dao.annotations.CreateTime;
  import org.apache.bigtop.manager.dao.annotations.UpdateBy;
  import org.apache.bigtop.manager.dao.annotations.UpdateTime;
  
  import org.apache.ibatis.binding.MapperMethod;
  import org.apache.ibatis.executor.Executor;
  import org.apache.ibatis.mapping.MappedStatement;
  import org.apache.ibatis.mapping.SqlCommandType;
  import org.apache.ibatis.plugin.Interceptor;
  import org.apache.ibatis.plugin.Intercepts;
  import org.apache.ibatis.plugin.Invocation;
  import org.apache.ibatis.plugin.Signature;
  
  import lombok.extern.slf4j.Slf4j;
  
  import java.lang.reflect.Field;
  import java.sql.Timestamp;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.function.Supplier;
  
  @Slf4j
  @Intercepts({
      @Signature(
              type = Executor.class,
              method = "update",
              args = {MappedStatement.class, Object.class})
  })
  public class AuditingInterceptor implements Interceptor {
  
      private final Supplier<Long> currentUser;
  
      public AuditingInterceptor(Supplier<Long> currentUser) {
          this.currentUser = currentUser;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public Object intercept(Invocation invocation) throws Throwable {
          MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
          SqlCommandType sqlCommandType = mappedStatement.getSqlCommandType();
  
          // Get Entity Object
          Object parameter = invocation.getArgs()[1];
          log.debug("sqlCommandType {}", sqlCommandType);
  
          if (SqlCommandType.INSERT == sqlCommandType || SqlCommandType.UPDATE == sqlCommandType) {
              Collection<Object> objects;
              if (parameter instanceof MapperMethod.ParamMap) {
                  MapperMethod.ParamMap<Object> paramMap = ((MapperMethod.ParamMap<Object>) parameter);
                  if (!paramMap.containsKey("param1") && paramMap.containsKey("arg0")) {
                      objects = ((Collection<Object>) paramMap.get("arg0"));
                  } else if (paramMap.get("param1") instanceof Collection) {
                      objects = ((Collection<Object>) paramMap.get("param1"));
                  } else {
                      objects = Collections.singletonList(paramMap.get("param1"));
                  }
              } else {
                  objects = Collections.singletonList(parameter);
              }
  
              for (Object o : objects) {
                  setAuditFields(o, sqlCommandType);
              }
          }
          return invocation.proceed();
      }
  
      private void setAuditFields(Object object, SqlCommandType sqlCommandType) throws IllegalAccessException {
          Long userId = currentUser.get();
          Timestamp timestamp = new Timestamp(System.currentTimeMillis());
  
          List<Field> fields = ClassUtils.getFields(object.getClass());
  
          for (Field field : fields) {
              boolean accessible = field.canAccess(object);
              field.setAccessible(true);
              if (field.isAnnotationPresent(CreateBy.class)
                      && SqlCommandType.INSERT == sqlCommandType
                      && userId != null) {
                  field.set(object, userId);
              }
              if (field.isAnnotationPresent(CreateTime.class) && SqlCommandType.INSERT == sqlCommandType) {
                  field.set(object, timestamp);
              }
              if (field.isAnnotationPresent(UpdateBy.class) && userId != null) {
                  field.set(object, userId);
              }
              if (field.isAnnotationPresent(UpdateTime.class)) {
                  field.set(object, timestamp);
              }
              field.setAccessible(accessible);
          }
      }
  }
  