mybatisplus sql 改写2

1通过DataScopePermissionHandler  改写

@Aspect
@Slf4j
@Component
public class DataScopePermissionHandler implements DataPermissionHandler {

	/**
     * 通过ThreadLocal记录权限相关的属性值
     */
    ThreadLocal threadLocal = new ThreadLocal<>();

	/**
     * 清空当前线程上次保存的权限信息
     */
     @After("dataScopePointCut()")
    public void clearThreadLocal(){
        threadLocal.remove();
        log.debug("threadLocal.remove()");
    }

	/**
     * 注解对象
     */
    private DataScope controllerDataScope;

    /**
     * 配置织入点
     */
    @Pointcut("@annotation(com.xxx.base.datascope.annotation.DataScope)")
    public void dataScopePointCut() {
    }

    @Before("dataScopePointCut()")
    public void doBefore(JoinPoint point) {
        // 获得注解
        controllerDataScope = getAnnotationLog(point);
        if (controllerDataScope != null) {
            // 获取当前的用户及相关属性，需提前获取和保存数据权限对应的部门ID集合
            User currentUser = SecurityUtil.getUser();
            DataScopeParam dataScopeParam = new DataScopeParam(controllerDataScope.deptAlias(),
                    controllerDataScope.deptField(),
                    currentUser.isAdmin(),
                    currentUser.getDataScope());
            threadLocal.set(dataScopeParam);
            log.debug("currentUser.getDataScope() = {}", currentUser.getDataScope());
        }
    }

    /**
     * 是否存在注解，如果存在就获取
     */
    private DataScope getAnnotationLog(JoinPoint joinPoint) {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();
        if (method != null) {
            return method.getAnnotation(DataScope.class);
        }
        return null;
    }

    /**
     * @param where             原SQL Where 条件表达式
     * @param mappedStatementId Mapper接口方法ID
     * @return
     */
    @SneakyThrows
    @Override
    public Expression getSqlSegment(Expression where, String mappedStatementId) {
        log.debug("DataScopePermissionHandler .getSqlSegment");
        DataScopeParam dataScopeParam = threadLocal.get();
        if(controllerDataScope == null || dataScopeParam == null || dataScopeParam.isAdmin()){
            return where;
        }

        if (where == null) {
            where = new HexValue(" 1 = 1 ");
        }

        String deptSql = "".equals(dataScopeParam.deptAlias) ? dataScopeParam.deptField : dataScopeParam.deptAlias + "." + dataScopeParam.deptField;

        // 把集合转变为JSQLParser需要的元素列表
        ItemsList itemsList;
        if(CollectionUtils.isEmpty(dataScopeParam.secretary)){
        	//如果权限为空，则只能看自己部门的
            itemsList = new ExpressionList(Collections.singletonList(new LongValue(SecurityUtil.getUser().getOrganizeId())));
        }else {
        	//查看权限内的数据
            itemsList = new ExpressionList(dataScopeParam.secretary.stream().map(LongValue::new).collect(Collectors.toList()));
        }
        InExpression inExpression = new InExpression(new Column(deptSql), itemsList);
        log.debug("where = {}", where);
        log.debug("inExpression = {}", inExpression);
        return new AndExpression(where, inExpression);

    }

    /**
     * ThreadLocal存储对象
     */
    @Data
    @AllArgsConstructor
    static class DataScopeParam{
        /**
         * 部门表的别名
         */
        private String deptAlias;

        /**
         * 部门字段名
         */
        private String deptField;
        
        /**
         * 是否是管理员
         */
        private boolean isAdmin;

        /**
         * 数据权限范围
         */
        private Set secretary;
    }
}

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