feat(content): 添加动态排序功能和token验证接口

- 在BaseQueryDto中新增sortBy和sortDesc字段用于排序控制
- 修改CmsContentMapper.xml实现动态SQL排序功能
- 添加validateToken接口用于验证用户登录状态
- 集成Sa-Token进行token有效性检查
- 提供清晰的排序参数描述和文档注释

src/main/java/com/kexue/skills/controller/LoginController.java

@@ -84,5 +84,22 @@ public class LoginController {
         return CommonResult.success(sysUserService.phoneLogin(phoneLoginDto));
     }
 
+    /**
+     * 验证token是否有效
+     *
+     * @return 验证结果
+     */
+    @PostMapping("/validateToken")
+    @Operation(summary = "验证token是否有效", description = "验证token是否有效")
+    public CommonResult<Object> validateToken() {
+        try {
+            // 使用Sa-Token检查登录状态
+            cn.dev33.satoken.stp.StpUtil.checkLogin();
+            return CommonResult.success(true);
+        } catch (Exception e) {
+            return CommonResult.failed("无效的token，请重新登录");
+        }
+    }
+
 }
 

src/main/java/com/kexue/skills/entity/base/BaseQueryDto.java

@@ -19,4 +19,10 @@ public class BaseQueryDto implements Serializable {
     @Schema(description ="每页数量")
     private Integer pageSize;
 
+    @Schema(description ="排序字段")
+    private String sortBy;
+
+    @Schema(description ="是否降序排序")
+    private Boolean sortDesc;
+
 }

src/main/resources/mapper/CmsContentMapper.xml

@@ -98,7 +98,12 @@
                 and delete_flag = #{deleteFlag}
             </if>
         </where>
-        order by sort asc, create_time desc
+        <if test="sortBy != null and sortBy != ''">
+            order by ${sortBy} ${sortDesc ? 'desc' : 'asc'}
+        </if>
+        <if test="sortBy == null or sortBy == ''">
+            order by sort asc, create_time desc
+        </if>
     </select>
 
     <!--查询列表-->