add some APIs

Server/Controller/UserApiController.cs

@@ -103,6 +103,44 @@ public partial class UserApiController : BaseController
         return NoContent();
     }
 
+    /// <summary>
+    /// 判断当前会话是否有效
+    /// </summary>
+    /// <remarks>
+    /// 请求示例：
+    /// 
+    ///     GET /api/user/validation
+    ///     Authorization: authorization id
+    /// 
+    /// </remarks>
+    /// <returns>会话有效则返回会话对象</returns>
+    /// <response code="200">返回会话对象</response>
+    /// <response code="401">认证失败</response>
+    [Route("validation", Name = "validation")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
+    [ProducesErrorResponseType(typeof(ErrorResponse))]
+    [HttpGet]
+    [ResponseCache(NoStore = true, Location = ResponseCacheLocation.None)]
+    public ActionResult<TokenItem> Validation()
+    {
+        var (result, token) = CheckToken();
+        if (result != null)
+        {
+            return result;
+        }
+        if (token == null)
+        {
+            return Unauthorized();
+        }
+
+        // update last active time
+        SaveDatabase();
+
+        return Ok(token);
+    }
+
     /// <summary>
     /// 注销当前登录会话
     /// </summary>