目录1.创建注解2. 具体实现
1.创建注解
当此注解打在类上，不需要传参，该类下所有查询接口开启数据隔离；打在方法上默认开启数据隔离，传参为false则该方法关闭验证
/** * 数据权限验证注解 * @author xiaohua * @date 2021/6/23 */@Documented@Target({METHOD, ANNOTATION_TYPE, TYPE})@Retention(RUNTIME)public @interface DataPermission { /** * 是否要进行数据权限隔离 */ boolean isPermi() default true;}
2. 具体实现
@Component@Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class, Integer.class})})public class DataPermissionInterceptor implements Interceptor { private static final Logger logger = LoggerFactory.getLogger(DataPermissionInterceptor.class); @Autowired private TokenService tokenService; //扫描的包路径（根据自己的项目路径来），这里是取的配置里的包路径 @Value("${permission.package-path}") private String packagePath; private final static String DEPT_ID = "dept_id"; private final static String USER_ID = "create_user"; private static List<String> classNames; @Override public Object intercept(Invocation invocation) throws Throwable { try { LoginInfo user = tokenService.getLoginInfo(); if (user == null){ return invocation.proceed(); } List<Long> deptIds = (List<Long>) Convert.toList(user.getDataScope()); if (deptIds == null){ deptIds = new ArrayList<>(); } //反射扫包会比较慢，这里做了个懒加载 if (classNames == null) { synchronized (LazyInit.class){ if (classNames == null){ //扫描指定包路径下所有包含指定注解的类 Set<Class<?>> classSet = ClassUtil.scanPackageByAnnotation(packagePath, DataPermission.class); if (classSet == null && classSet.size() == 0){ classNames = new ArrayList<>(); } else { //取得类全名 classNames = classSet.stream().map(Class::getName).collect(Collectors.toList()); } } } } // 拿到mybatis的一些对象 StatementHandler statementHandler = PluginUtils.realTarget(invocation.getTarget()); MetaObject metaObject = SystemMetaObject.forObject(statementHandler); MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement"); // mappedStatement.getId()为执行的mapper方法的全路径名,newId为执行的mapper方法的类全名 String newId = mappedStatement.getId().substring(0, mappedStatement.getId().lastIndexOf(".")); // 如果不是指定的方法，直接结束拦截 if (!classNames.contains(newId)) { return invocation.proceed(); } String newName = mappedStatement.getId().substring(mappedStatement.getId().lastIndexOf(".") + 1, mappedStatement.getId().length()); //是否开启数据权限 boolean isPermi = true; Class<?> clazz = Class.forName(newId); //遍历方法 for (Method method : clazz.getDeclaredMethods()) { //方法是否含有DataPermission注解，如果含有注解则将数据结果过滤 if (method.isAnnotationPresent(DataPermission.class) && newName.equals(method.getName())) { DataPermission dataPermission = method.getAnnotation(DataPermission.class); if (dataPermission != null) { //不验证 if (!dataPermission.isPermi()) { isPermi = false; } else { //开启验证 isPermi = true; } } } } if (isPermi){ // 获取到原始sql语句 String sql = statementHandler.getBoundSql().getSql(); // 解析并返回新的SQL语句，只处理查询sql if (mappedStatement.getSqlCommandType().toString().equals("SELECT")) { // String newSql = getNewSql(sql,deptIds,user.getUserId()); sql = getSql(sql,deptIds,user.getUserId()); } // 修改sql metaObject.setValue("delegate.boundSql.sql", sql); } return invocation.proceed(); } catch (Exception e){ logger.error("数据权限隔离异常：", e); return invocation.proceed(); } } /** * 解析SQL语句，并返回新的SQL语句 * 注意，该方法使用了JSqlParser来操作SQL，该依赖包Mybatis-plus已经集成了。如果要单独使用，请先自行导入依赖 * * @param sql 原SQL * @return 新SQL */ private String getSql(String sql,List<Long> deptIds,Long userId) { try { String condition = ""; String permissionSql = "("; if (deptIds.size() > 0){ for (Long deptId : deptIds) { if ("(".equals(permissionSql)){ permissionSql = permissionSql + deptId; } else { permissionSql = permissionSql + "," + deptId; } } permissionSql = permissionSql + ")"; // 修改原语句 condition = DEPT_ID +" in " + permissionSql; } else { condition = USER_ID +" = " + userId; } if (StringUtils.isBlank(condition)){ return sql; } Select select = (Select)CCJSqlParserUtil.parse(sql); PlainSelect plainSelect = (PlainSelect)select.getSelectBody(); //取得原SQL的where条件 final Expression expression = plainSelect.getWhere(); //增加新的where条件 final Expression envCondition = CCJSqlParserUtil.parseCondExpression(condition); if (expression == null) { plainSelect.setWhere(envCondition); } else { AndExpression andExpression = new AndExpression(expression, envCondition); plainSelect.setWhere(andExpression); } return plainSelect.toString(); } catch (JSQLParserException e) { logger.error("解析原SQL并构建新SQL错误：" + e); return sql; } }
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