一、介绍
上篇文章介绍的MyBatis Plus 插件实际上就是用拦截器实现的,MyBatis Plus拦截器对MyBatis的拦截器进行了包装处理,操作起来更加方便
二、自定义拦截器
2.1、InnerInterceptor
MyBatis Plus提供的InnerInterceptor接口提供了如下方法,主要包括:在查询之前执行,在更新之前执行,在SQL准备之前执行
2.2、编写简易拦截器
package com.xx.config;
import com.baomidou.mybatisplus.core.plugins.InterceptorIgnoreHelper;
import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
import com.baomidou.mybatisplus.extension.parser.JsqlParserSupport;
import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.expression.StringValue;
import net.sf.jsqlparser.expression.operators.conditional.AndExpression;
import net.sf.jsqlparser.expression.operators.relational.EqualsTo;
import net.sf.jsqlparser.expression.operators.relational.ExpressionList;
import net.sf.jsqlparser.expression.operators.relational.ItemsList;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.statement.delete.Delete;
import net.sf.jsqlparser.statement.insert.Insert;
import net.sf.jsqlparser.statement.select.PlainSelect;
import net.sf.jsqlparser.statement.select.Select;
import net.sf.jsqlparser.statement.select.SelectBody;
import net.sf.jsqlparser.statement.update.Update;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.MappedStatement;
import org.springframework.stereotype.Component;
import java.sql.Connection;
/**
* @author aqi
* @date 2023/5/17 15:07
*/
@Slf4j
@Component
public class TestInterceptor extends JsqlParserSupport implements InnerInterceptor {
@Override
public void beforePrepare(StatementHandler sh, Connection connection, Integer transactionTimeout) {
// 这里固定这么写就可以了
PluginUtils.MPStatementHandler mpSh = PluginUtils.mpStatementHandler(sh);
MappedStatement ms = mpSh.mappedStatement();
if (InterceptorIgnoreHelper.willIgnoreTenantLine(ms.getId())) {
return;
}
PluginUtils.MPBoundSql mpBs = mpSh.mPBoundSql();
mpBs.sql(parserMulti(mpBs.sql(), null));
}
/**
* 该方法由JsqlParserSupport提供,主要用于通过API的方式操作SQL
* 思路:通过API构建出新的条件,并将新的条件和之前的条件拼接在一起
*/
@Override
protected void processSelect(Select select, int index, String sql, Object obj) {
// 解析SQL
SelectBody selectBody = select.getSelectBody();
PlainSelect plainSelect = (PlainSelect) selectBody;
// 构建eq对象
EqualsTo equalsTo = new EqualsTo(new Column("name"), new StringValue("tom"));
// 将原来的条件和新构建的条件合在一起
AndExpression andExpression = new AndExpression(plainSelect.getWhere(), equalsTo);
// 重新封装where条件
plainSelect.setWhere(andExpression);
}
@Override
protected void processInsert(Insert insert, int index, String sql, Object obj) {
insert.getColumns().add(new Column("name"));
((ExpressionList) insert.getItemsList()).getExpressions().add(new StringValue("tom"));
}
@Override
protected void processUpdate(Update update, int index, String sql, Object obj) {
update.addUpdateSet(new Column("name"), new StringValue("tom"));
}
@Override
protected void processDelete(Delete delete, int index, String sql, Object obj) {
// 删除新增条件和查询一样,不做演示
}
}
2.3、将拦截器添加到MyBatis Plus拦截器中
package com.xx.config;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author aqi
* @date 2023/5/15 14:05
*/
@Configuration
public class MybatisPlusConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
// 初始化Mybatis Plus拦截器
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new TestInterceptor());
return interceptor;
}
}
2.4、编写测试用例
@Test
void save() {
AirlinesInfo airlinesInfo = new AirlinesInfo();
airlinesInfo.setInfo("remark");
airlinesInfoService.save(airlinesInfo);
}
@Test
void update() {
AirlinesInfo airlinesInfo = new AirlinesInfo();
airlinesInfo.setId(1L);
airlinesInfo.setInfo("remark, remark");
airlinesInfoService.updateById(airlinesInfo);
}
@Test
void select() {
airlinesInfoService.list();
}
2.5、执行结果
三、自定义拦截器实现数据权限控制
3.1、编写拦截器
package com.xx.config;
import com.baomidou.mybatisplus.core.plugins.InterceptorIgnoreHelper;
import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
import com.baomidou.mybatisplus.extension.parser.JsqlParserSupport;
import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
import com.xx.entity.Permission;
import com.xx.utils.ExpressionUtils;
import com.xx.utils.UserUtils;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.statement.select.PlainSelect;
import net.sf.jsqlparser.statement.select.Select;
import net.sf.jsqlparser.statement.select.SelectBody;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.springframework.stereotype.Component;
import java.sql.Connection;
/**
* @author xiaxing
*/
@Slf4j
@Component
public class DataScopeInterceptor extends JsqlParserSupport implements InnerInterceptor {
@Override
public void beforePrepare(StatementHandler sh, Connection connection, Integer transactionTimeout) {
log.info("[DataScopeInterceptor]beforePrepare...");
PluginUtils.MPStatementHandler mpSh = PluginUtils.mpStatementHandler(sh);
MappedStatement ms = mpSh.mappedStatement();
SqlCommandType sct = ms.getSqlCommandType();
if (sct == SqlCommandType.INSERT || sct == SqlCommandType.SELECT) {
if (InterceptorIgnoreHelper.willIgnoreTenantLine(ms.getId())) {
return;
}
PluginUtils.MPBoundSql mpBs = mpSh.mPBoundSql();
mpBs.sql(parserMulti(mpBs.sql(), null));
}
}
/**
* 查询
*/
@Override
protected void processSelect(Select select, int index, String sql, Object obj) {
SelectBody selectBody = select.getSelectBody();
PlainSelect plainSelect = (PlainSelect) selectBody;
// 获取表名/别名(如果是关联查询是取第一个join左侧的表名/别名)
String tableName = ExpressionUtils.getTableName(plainSelect);
// 构建用户权限控制条件
Expression userPermissionExpression = this.buildUserPermissionSql(tableName);
if (null != userPermissionExpression) {
// 将sql原本就有得where条件和新构建出来的条件拼接起来
plainSelect.setWhere(ExpressionUtils.appendExpression(plainSelect.getWhere(), userPermissionExpression));
}
}
/**
* 构建用户权限控制条件
* @param tableName 表名/别名(join查询左侧表名)
*/
private Expression buildUserPermissionSql(String tableName) {
// 获取当前用户信息(这里的数据都是模拟的,实际上可能得从缓存或者session中获取)
Permission permission = UserUtils.getUserPermission();
return null != permission ? ExpressionUtils.buildInSql(tableName + "." + permission.getField(), permission.getValue()) : null;
}
}
3.2、编写构建SQL工具类
package com.xx.utils;
import net.sf.jsqlparser.expression.Alias;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.StringValue;
import net.sf.jsqlparser.expression.operators.conditional.AndExpression;
import net.sf.jsqlparser.expression.operators.relational.EqualsTo;
import net.sf.jsqlparser.expression.operators.relational.ExpressionList;
import net.sf.jsqlparser.expression.operators.relational.InExpression;
import net.sf.jsqlparser.expression.operators.relational.ItemsList;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.select.PlainSelect;
import java.util.Set;
import java.util.stream.Collectors;
/**
* @author aqi
* @date 2023/5/17 10:16
* @describe JSqlParser工具类,用于通过API的方式操作SQL语句
*/
public class ExpressionUtils {
/**
* 构建in sql
* @param columnName 字段名称
* @param params 字段值
* @return InExpression
*/
public static InExpression buildInSql(String columnName, Set<String> params) {
// 把集合转变为JSQLParser需要的元素列表
ItemsList itemsList = new ExpressionList(params.stream().map(StringValue::new).collect(Collectors.toList()));
// 创建IN表达式对象,传入列名及IN范围列表
return new InExpression(new Column(columnName), itemsList);
}
/**
* 构建eq sql
* @param columnName 字段名称
* @param value 字段值
* @return EqualsTo
*/
public static EqualsTo buildEq(String columnName, String value) {
return new EqualsTo(new Column(columnName), new StringValue(value));
}
/**
* 获取表名/别名
* @param plainSelect plainSelect
* @return 表名/别名
*/
public static String getTableName(PlainSelect plainSelect) {
// 获取别名
Table table= (Table) plainSelect.getFromItem();
Alias alias = table.getAlias();
return null == alias ? table.getName() : alias.getName();
}
/**
* 将2个where条件拼接到一起
* @param where 条件
* @param appendExpression 待拼接条件
* @return Expression
*/
public static Expression appendExpression(Expression where, Expression appendExpression) {
return null == where ? appendExpression : new AndExpression(where, appendExpression);
}
}
3.3、模拟用户信息工具类
package com.xx.utils;
import com.xx.config.Globle;
import com.xx.entity.Permission;
import com.xx.entity.User;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.*;
/**
* @author aqi
* @date 2023/5/17 14:20
*/
@Slf4j
public class UserUtils {
public static User currentUser;
static {
// 构建测试数据
List<Permission> permissionList = new ArrayList<>();
// demo/test接口权限
Permission permission = new Permission();
permission.setField("id");
permission.setUri("/demo/test");
Set<String> set = new HashSet<>();
set.add("1");
set.add("2");
set.add("3");
permission.setValue(set);
permissionList.add(permission);
// demo/test1接口权限
Permission permission1 = new Permission();
permission1.setField("id");
permission1.setUri("/demo/test1");
Set<String> set1 = new HashSet<>();
set1.add("4");
set1.add("5");
set1.add("6");
permission1.setValue(set1);
permissionList.add(permission1);
User user = new User();
user.setPermissionList(permissionList);
user.setTenantId("1");
currentUser = user;
}
public static Permission getUserPermission() {
User currentUser = Globle.currentUser;
String uri = UserUtils.getUri();
List<Permission> permissionList = currentUser.getPermissionList();
return permissionList.stream().filter(e -> Objects.equals(e.getUri(), uri)).findFirst().orElse(null);
}
/**
* 获取本次请求的uri
* @return uri
*/
private static String getUri() {
// 获取此次请求的uri
String uri = "";
RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
if (null != requestAttributes) {
HttpServletRequest request = ((ServletRequestAttributes) requestAttributes).getRequest();
uri = request.getRequestURI();
}
log.info("[DataScopeInterceptor]此次请求uri:{}", uri);
return uri;
}
}
3.4、将拦截器添加到MyBatis Plus蓝机器中
package com.xx.config;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author aqi
* @date 2023/5/15 14:05
*/
@Configuration
public class MybatisPlusConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
// 初始化Mybatis Plus拦截器
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new DataScopeInterceptor());
return interceptor;
}
}
3.5、测试
package com.xx.controller;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.github.pagehelper.PageHelper;
import com.xx.entity.AirlinesInfo;
import com.xx.service.AirlinesInfoService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
/**
* @author aqi
* @date 2023/5/18 11:01
*/
@Slf4j
@RestController
@RequestMapping("/demo")
public class DemoController {
@Resource
private AirlinesInfoService airlinesInfoService;
@GetMapping("/test")
public void test() {
log.info("进入test接口,测试权限控制在基础的sql语句是否能生效");
airlinesInfoService.list();
// 执行结果:(SELECT * FROM airlines_info WHERE state = 0 AND airlines_info.id IN ('1', '2', '3'))
}
@GetMapping("/test1")
public void test1() {
log.info("进入test1接口,测试权限控制在使用MyBatis Plus 的分页插件之后能否生效");
Page<AirlinesInfo> page = new Page<>(1, 5);
airlinesInfoService.page(page, new QueryWrapper<AirlinesInfo>().eq("name", "tom"));
// 执行结果:(SELECT * FROM airlines_info WHERE state = 0 AND (name = ?) AND airlines_info.id IN ('4', '5', '6') LIMIT ?)
}
@GetMapping("/test2")
public void test2() {
log.info("进入test2接口,测试权限控制在使用PageHelper之后能否生效");
PageHelper.startPage(1, 5);
airlinesInfoService.list(new LambdaQueryWrapper<AirlinesInfo>().eq(AirlinesInfo::getName, "tom"));
// 执行结果:(SELECT * FROM airlines_info WHERE state = 0 AND (name = ?) AND airlines_info.id IN ('7', '8', '9') LIMIT ?)
}
@GetMapping("/test3")
public void test3() {
log.info("进入test3接口,测试权限控制在使用自定义复杂关联查询之后能否生效");
airlinesInfoService.innerSql();
// 原始SQL:(select * from airlines_info t1 INNER JOIN t_config on t1.id = t_config.id where t1.name = 'tom' and t_config.name = 'jack' limit 5)
// 执行结果:(SELECT * FROM airlines_info t1 INNER JOIN t_config ON t1.id = t_config.id WHERE t1.name = 'tom' AND t_config.name = 'jack' AND t1.id IN ('11', '12', '10') LIMIT 5)
}
@GetMapping("/test4")
public void test4() {
log.info("进入test4接口,测试该接口没有设计权限限制是否可以不生效");
airlinesInfoService.list();
// 执行结果:(SELECT * FROM airlines_info WHERE state = 0)
}
}
四、结论
通过测试可以看出不论在什么情况下都可以正常的对权限进行控制文章来源:https://www.toymoban.com/news/detail-799316.html
注意:上面部分代码使用的是MyBatis Plus 3.5.3版本,并且使用的JSqlParser部分API已经不推荐使用,但是我没有找到最新的API应该怎么写文章来源地址https://www.toymoban.com/news/detail-799316.html
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