背景
数据库在保存数据时,对于某些敏感数据需要脱敏或者加密处理,如果一个一个的去加显然工作量大而且容易出错,这个时候可以考虑使用拦截器,本文针对的是mybatis-plus作为持久层框架,其他场景未测试。代码如下:
一、查询拦截器
package com.sfpay.merchant.service.interceptor; import com.baomidou.mybatisplus.core.toolkit.CollectionUtils; import com.sfpay.merchant.service.service.CryptService; import lombok.extern.slf4j.Slf4j; import org.apache.ibatis.binding.MapperMethod; import org.apache.ibatis.cache.CacheKey; import org.apache.ibatis.executor.Executor; import org.apache.ibatis.mapping.BoundSql; import org.apache.ibatis.mapping.MappedStatement; 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 org.apache.ibatis.session.ResultHandler; import org.apache.ibatis.session.RowBounds; import org.springframework.beans.factory.annotation.Autowired; import java.util.ArrayList; import java.util.Map; import java.util.Objects; /** * @describe: 查询拦截器 * 查询条件加密使用方式:使用 @Param("decrypt")注解的自定义类型 * 返回结果解密使用方式: ①在自定义的DO上加上注解 CryptAnnotation ②在需要加解密的字段属性上加上CryptAnnotation * @author: *** * @date: 2021/3/30 17:51 */ @Slf4j @Intercepts({ @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}), @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}) }) public class QueryInterceptor implements Interceptor { /** * 查询参数名称,ParamMap的key值 */ private static final String DECRYPT = "decrypt"; @Autowired private CryptService cryptService; @Autowired private UpdateInterceptor updateInterceptor; @Override public Object intercept(Invocation invocation) throws Throwable { //获取查询参数,查询条件是否需要加密 Object[] args = invocation.getArgs(); Object parameter = args[1]; Object result = null; //设置执行标识 boolean flag = true; if (parameter instanceof MapperMethod.ParamMap) { Map paramMap = (Map) parameter; if (paramMap.containsKey(DECRYPT)) { Object queryParameter = paramMap.get(DECRYPT); if (updateInterceptor.needToCrypt(queryParameter)) { //执行sql,还原加密后的报文 MappedStatement mappedStatement = (MappedStatement) args[0]; result = updateInterceptor.proceed(invocation, mappedStatement, queryParameter); flag = false; } } } //是否需要执行 if (flag) { result = invocation.proceed(); } if (Objects.isNull(result)) { return null; } // 返回列表数据,循环检查 if (result instanceof ArrayList) { ArrayList resultList = (ArrayList) result; if (CollectionUtils.isNotEmpty(resultList) && updateInterceptor.needToCrypt(resultList.get(0))) { for (Object o : resultList) { cryptService.decrypt(o); } } } else if (updateInterceptor.needToCrypt(result)) { cryptService.decrypt(result); } //返回结果 return result; } }
二、插入和更新拦截器
package com.sfpay.merchant.service.interceptor; import com.baomidou.mybatisplus.annotation.TableId; import com.sfpay.merchant.common.util.annotation.CryptAnnotation; import com.sfpay.merchant.service.service.CryptService; 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 org.apache.ibatis.session.defaults.DefaultSqlSession; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.annotation.Autowired; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.util.Arrays; import java.util.Map; import java.util.Objects; import java.util.Optional; /** * @describe: 数据库更新操作拦截器 * 一、支持的使用场景 * ①场景一:通过mybatis-plus BaseMapper自动映射的方法 * ②场景一:通过mapper接口自定义的方法,更新对象为自定义DO * 二、使用方法 * ①在自定义的DO上加上注解 CryptAnnotation * ②在需要加解密的字段属性上加上CryptAnnotation * ③自定义映射方法在需要加解密的自定义DO参数使用@Param("et") * @author: *** * @date: 2021/3/31 17:51 */ @Intercepts({@Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})}) public class UpdateInterceptor implements Interceptor { @Autowired private CryptService cryptService; /** * 更新参数名称,ParamMap的key值 */ private static final String CRYPT = "et"; @Override public Object intercept(Invocation invocation) throws Throwable { //代理类方法参数,该拦截器拦截的update方法有两个参数args = {MappedStatement.class, Object.class} Object[] args = invocation.getArgs(); //获取方法参数 MappedStatement mappedStatement = (MappedStatement) args[0]; Object parameter = args[1]; if (Objects.isNull(parameter)) { //无参数,直接放行 return invocation.proceed(); } // 如果是多个参数或使用Param注解(Param注解会将参数放置在ParamMap中) if (parameter instanceof MapperMethod.ParamMap) { Map paramMap = (Map) parameter; if (paramMap.containsKey(CRYPT)) { Object updateParameter = paramMap.get(CRYPT); if (needToCrypt(updateParameter)) { //执行sql,还原加解密后的报文 return proceed(invocation, mappedStatement, updateParameter); } } } else if (parameter instanceof DefaultSqlSession.StrictMap) { //不知道是啥意思,直接过 return invocation.proceed(); } else if (needToCrypt(parameter)) { //执行sql,还原加解密后的报文 return proceed(invocation, mappedStatement, parameter); } //其他场景直接放行 return invocation.proceed(); } /** * 执行sql,还原加解密后的报文 * * @param invocation * @param mappedStatement * @param parameter * @return * @throws IllegalAccessException * @throws InstantiationException * @throws InvocationTargetException */ Object proceed(Invocation invocation, MappedStatement mappedStatement, Object parameter) throws IllegalAccessException, InstantiationException, InvocationTargetException { //先复制一个对象备份数据 Object newInstance = newInstance(parameter); //调用加解密服务 cryptService.encrypt(parameter); //执行操作,得到返回结果 Object result = invocation.proceed(); //把加解密后的字段还原 reductionParameter(mappedStatement, newInstance, parameter); //返回结果 return result; } /** * 先复制一个对象备份数据,便于加解密后还原原报文 * * @param parameter * @return * @throws IllegalAccessException * @throws InstantiationException */ private Object newInstance(Object parameter) throws IllegalAccessException, InstantiationException { Object newInstance = parameter.getClass().newInstance(); BeanUtils.copyProperties(parameter, newInstance); return newInstance; } /** * 把加解密后的字段还原,同时把mybatis返回的tableId返回给参数对象 * * @param mappedStatement * @param newInstance * @param parameter * @throws IllegalAccessException */ private void reductionParameter(MappedStatement mappedStatement, Object newInstance, Object parameter) throws IllegalAccessException { //获取映射语句命令类型 SqlCommandType sqlCommandType = mappedStatement.getSqlCommandType(); if (SqlCommandType.INSERT == sqlCommandType) { //从参数属性中找到注解是TableId的字段 Field[] parameterFields = parameter.getClass().getDeclaredFields(); Optionaloptional = Arrays.stream(parameterFields).filter(field -> field.isAnnotationPresent(TableId.class)).findAny(); if (optional.isPresent()) { Field field = optional.get(); field.setAccessible(true); Object id = field.get(parameter); //覆盖参数加解密的值 BeanUtils.copyProperties(newInstance, parameter); field.set(parameter, id); } else { //覆盖参数加解密的值 BeanUtils.copyProperties(newInstance, parameter); } } else { //覆盖参数加解密的值 BeanUtils.copyProperties(newInstance, parameter); } } /** * 是否需要加解密: * ①是否属于基本类型,void类型和String类型,如果是,不加解密 * ②DO上是否有注解 ③ 属性是否有注解 * * @param object * @return */ public boolean needToCrypt(Object object) { if (object == null) { return false; } Class> clazz = object.getClass(); if (clazz.isPrimitive() || object instanceof String) { //基本类型和字符串不加解密 return false; } //获取DO注解 boolean annotationPresent = clazz.isAnnotationPresent(CryptAnnotation.class); if (!annotationPresent) { //无DO注解不加解密 return false; } //获取属性注解 Field[] fields = clazz.getDeclaredFields(); return Arrays.stream(fields).anyMatch(field -> field.isAnnotationPresent(CryptAnnotation.class)); } }
三、注解
import com.sfpay.merchant.common.constant.EncryptDataTypeEnum; import java.lang.annotation.*; /** * @author *** * @Date 2020/12/30 20:13 * @description 加密注解类 * @Param * @return **/ @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.FIELD, ElementType.TYPE}) @Documented @Inherited public @interface CryptAnnotation { EncryptDataTypeEnum type() default EncryptDataTypeEnum.OTHER; }
cryptService 为加密服务,怎么实现自己可以根据实际情况来实现。
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