功能更新

ShrlAlgoStudio/TimeHelper.cs

@@ -0,0 +1,48 @@
+using System.Globalization;
+using System.IO;
+using System.Net;
+
+namespace KeyGen
+{
+    internal static class TimeHelper
+    {
+        public static DateTime GetTrustedTime()
+        {
+            // 1. 尝试网络时间 (3秒超时)
+            try
+            {
+                var request = WebRequest.Create("http://www.baidu.com"); // 或 microsoft.com
+                request.Method = "HEAD";
+                request.Timeout = 3000;
+                using (var response = request.GetResponse())
+                {
+                    string dateStr = response.Headers["Date"];
+                    if (DateTime.TryParseExact(dateStr, "ddd, dd MMM yyyy HH:mm:ss 'GMT'",
+                            CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out DateTime netTime))
+                        return netTime.ToLocalTime();
+                }
+            }
+            catch { }
+
+            // 2. 尝试文件系统痕迹校验 (防断网改时间)
+            DateTime localNow = DateTime.Now;
+            try
+            {
+                // 获取系统目录和临时目录的最后修改时间
+                DateTime t1 = new DirectoryInfo(Environment.SystemDirectory).LastWriteTime;
+                DateTime t2 = new DirectoryInfo(Path.GetTempPath()).LastWriteTime;
+                DateTime latestFileTime = t1 > t2 ? t1 : t2;
+
+                // 如果本地时间比系统文件时间还要早超过24小时，判定为作弊
+                if (localNow < latestFileTime.AddHours(-24))
+                {
+                    return latestFileTime; // 强制使用文件时间
+                }
+            }
+            catch { }
+
+            // 3. 兜底
+            return localNow;
+        }
+    }
+}