实战!MyBatisPlus助你一键搞定数据权限控制!

凯哥java 2024-11-17 12:57:00

利用 MyBatis Plus 拦截器动态管理数据访问权限

引言

功能权限与数据权限

在软件开发过程中,我们经常遇到需要根据用户角色来控制数据访问权限的需求。特别是在列表数据展示时,要确保用户只能查看其权限数据范围内的。本文将介绍一种通过MyBatis拦截器实现数据权限控制的方案,该方案灵活且易于集成到现有项目中。

数据权限分配

01

基础版本实现

1. 创建注解类

首先,我们需要创建一个自定义注解 @UserDataPermission,用于标记需要进行数据权限控制的方法或类。具体代码如下:

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Target({ ElementType.METHOD, ElementType.TYPE })

@Retention(RetentionPolicy.RUNTIME)

public @interface UserDataPermission {

}

2. 创建拦截器

接下来,创建一个拦截器 MyDataPermissionInterceptor,实现 InnerInterceptor 接口,并重写查询方法。代码如下:

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.Data;

import lombok.NoArgsConstructor;

import lombok.ToString;

import lombok.EqualsAndHashCode;

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 net.sf.jsqlparser.statement.select.SetOperationList;

import org.apache.ibatis.executor.Executor;

import org.apache.ibatis.mapping.BoundSql;

import org.apache.ibatis.mapping.MappedStatement;

import org.apache.ibatis.session.ResultHandler;

import org.apache.ibatis.session.RowBounds;

import java.sql.SQLException;

import java.util.List;

@Data

@NoArgsConstructor

@ToString(callSuper = true)

@EqualsAndHashCode(callSuper = true)

public MyDataPermissionInterceptor extends JsqlParserSupport implements InnerInterceptor {

private MyDataPermissionHandler dataPermissionHandler;

@Override

public void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException {

if (InterceptorIgnoreHelper.willIgnoreDataPermission(ms.getId())) {

return;

}

PluginUtils.MPBoundSql mpBs = PluginUtils.mpBoundSql(boundSql);

mpBs.sql(this.parserSingle(mpBs.sql(), ms.getId()));

}

@Override

protected void processSelect(Select select, int index, String sql, Object obj) {

SelectBody selectBody = select.getSelectBody();

if (selectBody instanceof PlainSelect) {

this.setWhere((PlainSelect) selectBody, (String) obj);

} else if (selectBody instanceof SetOperationList) {

SetOperationList setOperationList = (SetOperationList) selectBody;

List<SelectBody> selectBodyList = setOperationList.getSelects();

selectBodyList.forEach(s -> this.setWhere((PlainSelect) s, (String) obj));

}

}

private void setWhere(PlainSelect plainSelect, String whereSegment) {

Expression sqlSegment = this.dataPermissionHandler.getSqlSegment(plainSelect, whereSegment);

if (sqlSegment != null) {

plainSelect.setWhere(sqlSegment);

}

}

}

3. 创建处理类

创建一个处理类 MyDataPermissionHandler,用于生成数据权限的 SQL 片段。如下代码:

import lombok.SneakyThrows;

import lombok.extern.slf4j.Slf4j;

import net.sf.jsqlparser.expression.Expression;

import net.sf.jsqlparser.expression.HexValue;

import net.sf.jsqlparser.expression.operators.relational.EqualsTo;

import net.sf.jsqlparser.schema.Column;

import net.sf.jsqlparser.schema.Table;

import net.sf.jsqlparser.statement.select.PlainSelect;

import java.lang.reflect.Method;

@Slf4j

public MyDataPermissionHandler {

private RemoteRoleService remoteRoleService;

private RemoteUserService remoteUserService;

@SneakyThrows(Exception.class)

public Expression getSqlSegment(PlainSelect plainSelect, String whereSegment) {

Expression where = plainSelect.getWhere();

if (where == null) {

where = new HexValue("1=1");

}

log.info("开始进行权限过滤, where: {}, mappedStatementId: {}", where, whereSegment);

StringName = whereSegment.substring(0, whereSegment.lastIndexOf("."));

String methodName = whereSegment.substring(whereSegment.lastIndexOf(".") + 1);

Table fromItem = (Table) plainSelect.getFromItem();

// 示例:根据用户角色生成不同的 SQL 片段

String roleName = "DATA_MANAGER"; // 假设从上下文中获取当前用户的角色

DataScope scope = DataPermission.getScope(List.of(roleName));

if (scope == DataScope.ALL) {

return where;

} else if (scope == DataScope.DEPT) {

// 假设有一个字段 department_id

Column column = new Column(new Table(fromItem.getName()), "department_id");

StringValue value = new StringValue("123"); // 假设从上下文中获取当前用户的部门ID

return new EqualsTo(column, value);

} else if (scope == DataScope.MYSELF) {

// 假设有一个字段 user_id

Column column = new Column(new Table(fromItem.getName()), "user_id");

StringValue value = new StringValue("456"); // 假设从上下文中获取当前用户的ID

return new EqualsTo(column, value);

}

return where;

}

}

4. 将拦截器加入 MyBatis-Plus 插件中

最后,将拦截器加入 MyBatis-Plus 插件中。具体入下代码:

import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.stereotype.Component;

@Component

public MyBatisPlusConfig {

@Autowired

private MyDataPermissionHandler myDataPermissionHandler;

@Bean

public MybatisPlusInterceptor mybatisPlusInterceptor() {

MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();

MyDataPermissionInterceptor dataPermissionInterceptor = new MyDataPermissionInterceptor();

dataPermissionInterceptor.setDataPermissionHandler(myDataPermissionHandler);

interceptor.addInnerInterceptor(dataPermissionInterceptor);

interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));

return interceptor;

}

}

功能权限与数据权限

02

进阶版实现

1. 建立范围枚举

定义一个范围枚举 DataScope,用于表示不同的数据权限范围。如下示例:

import lombok.AllArgsConstructor;

import lombok.Getter;

@AllArgsConstructor

@Getter

public enum DataScope {

ALL("ALL"),

DEPT("DEPT"),

MYSELF("MYSELF");

private String name;

}

2. 建立角色枚举

定义一个角色枚举 DataPermission,用于表示不同的角色及其对应的数据权限范围。代码如下:

import lombok.AllArgsConstructor;

import lombok.Getter;

import java.util.Collection;

@AllArgsConstructor

@Getter

public enum DataPermission {

DATA_MANAGER("数据管理员", "DATA_MANAGER", DataScope.ALL),

DATA_AUDITOR("数据审核员", "DATA_AUDITOR", DataScope.DEPT),

DATA_OPERATOR("数据业务员", "DATA_OPERATOR", DataScope.MYSELF);

private String name;

private String code;

private DataScope scope;

public static String getName(String code) {

for (DataPermission type : DataPermission.values()) {

if (type.getCode().equals(code)) {

return type.getName();

}

}

return null;

}

public static String getCode(String name) {

for (DataPermission type : DataPermission.values()) {

if (type.getName().equals(name)) {

return type.getCode();

}

}

return null;

}

public static DataScope getScope(Collection<String> code) {

for (DataPermission type : DataPermission.values()) {

for (String v : code) {

if (type.getCode().equals(v)) {

return type.getScope();

}

}

}

return DataScope.MYSELF;

}

}

3. 重写拦截器处理方法

在 MyDataPermissionHandler 中重写 getSqlSegment 方法,根据角色生成不同的 SQL 片段。完整代码:

import cn.hutool.core.collection.CollectionUtil;

import lombok.SneakyThrows;

import lombok.extern.slf4j.Slf4j;

import net.sf.jsqlparser.expression.*;

import net.sf.jsqlparser.expression.operators.relational.*;

import net.sf.jsqlparser.schema.Column;

import net.sf.jsqlparser.schema.Table;

import net.sf.jsqlparser.statement.select.PlainSelect;

import java.lang.reflect.Method;

import java.util.List;

import java.util.Objects;

import java.util.Set;

import java.util.stream.Collectors;

@Slf4j

public MyDataPermissionHandler {

private RemoteRoleService remoteRoleService;

private RemoteUserService remoteUserService;

@SneakyThrows(Exception.class)

public Expression getSqlSegment(PlainSelect plainSelect, String whereSegment) {

Expression where = plainSelect.getWhere();

if (where == null) {

where = new HexValue("1=1");

}

log.info("开始进行权限过滤, where: {}, mappedStatementId: {}", where, whereSegment);

StringName = whereSegment.substring(0, whereSegment.lastIndexOf("."));

String methodName = whereSegment.substring(whereSegment.lastIndexOf(".") + 1);

Table fromItem = (Table) plainSelect.getFromItem();

// 示例:根据用户角色生成不同的 SQL 片段

String roleName = "DATA_MANAGER"; // 假设从上下文中获取当前用户的角色

DataScope scope = DataPermission.getScope(List.of(roleName));

if (scope == DataScope.ALL) {

return where;

} else if (scope == DataScope.DEPT) {

// 假设有一个字段 department_id

Column column = new Column(new Table(fromItem.getName()), "department_id");

StringValue value = new StringValue("123"); // 假设从上下文中获取当前用户的部门ID

return new EqualsTo(column, value);

} else if (scope == DataScope.MYSELF) {

// 假设有一个字段 user_id

Column column = new Column(new Table(fromItem.getName()), "user_id");

StringValue value = new StringValue("456"); // 假设从上下文中获取当前用户的ID

return new EqualsTo(column, value);

}

return where;

}

}

使用示例

在实际项目中,我们可以在 Mapper 层的方法上添加 @UserDataPermission 注解,实现数据权限控制。

import com.baomidou.mybatisplus.core.conditions.Wrapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import com.baomidou.mybatisplus.core.metadata.IPage;

import com.baomidou.mybatisplus.core.toolkit.Constants;

import org.apache.ibatis.annotations.Param;

import java.io.Serializable;

import java.util.Collection;

import java.util.List;

import java.util.Map;

public interface DataPermissionMapper<T> extends BaseMapper<T> {

@Override

@UserDataPermission

T selectById(Serializable id);

@Override

@UserDataPermission

List<T> selectBatchIds(@Param(Constants.COLLECTION) Collection<? extends Serializable> idList);

@Override

@UserDataPermission

List<T> selectByMap(@Param(Constants.COLUMN_MAP) Map<String, Object> columnMap);

@Override

@UserDataPermission

Integer selectCount(@Param(Constants.WRAPPER) Wrapper<T> queryWrapper);

@Override

@UserDataPermission

List<T> selectList(@Param(Constants.WRAPPER) Wrapper<T> queryWrapper);

@Override

@UserDataPermission

List<Map<String, Object>> selectMaps(@Param(Constants.WRAPPER) Wrapper<T> queryWrapper);

@Override

@UserDataPermission

List<Object> selectObjs(@Param(Constants.WRAPPER) Wrapper<T> queryWrapper);

@Override

@UserDataPermission

<E extends IPage<T>> E selectPage(E page, @Param(Constants.WRAPPER) Wrapper<T> queryWrapper);

@Override

@UserDataPermission

<E extends IPage<Map<String, Object>>> E selectMapsPage(E page, @Param(Constants.WRAPPER) Wrapper<T> queryWrapper);

}

03

结论

通过上述步骤,我们可以有效地使用 MyBatis Plus 拦截器实现数据权限控制。无论是基础版本还是进阶版,都能满足不同场景下的需求。希望本文能帮助你在实际项目中更好地管理和控制数据权限。

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