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KretaWeb/Controllers/Logic/SessionHandler.cs

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+using System;
+using System.Runtime.Caching;
+using Kreta.Core;
+using Kreta.Framework;
+using Kreta.Web.Security;
+
+namespace Kreta.Web.Controllers.Logic
+{
+    public class SessionHandler
+    {
+        private static readonly CacheItemPolicy DefaultCacheItemPolicy = new CacheItemPolicy { SlidingExpiration = TimeSpan.FromMinutes(60) };
+
+        private static int sessionTimeOut = 0;
+
+        private static string GetCacheKey(string sessionId)
+        {
+            return $"{nameof(SessionHandler)}_{sessionId}";
+        }
+
+        public static int SessionTimeOut
+        {
+            get
+            {
+                if (sessionTimeOut < 1)
+                {
+                    sessionTimeOut = (SDAServer.Instance.Configuration.SessionTimeout - 1) * 60; // A kérés és válasz alatt a mi számlálónk elcsúszik pár másodperccel és a valódi session hamarabb járna le.
+                    if (sessionTimeOut < 45)
+                    {
+                        sessionTimeOut = 45;
+                    }
+                }
+
+                return sessionTimeOut;
+            }
+        }
+
+        public static void UpdateSessionTime()
+        {
+            string sessionId = ClaimData.SessionId;
+            if (string.IsNullOrWhiteSpace(sessionId))
+            {
+                throw new Exception("Invalid Session key");
+            }
+
+            Cache.Set(GetCacheKey(sessionId), DateTime.Now, DefaultCacheItemPolicy);
+        }
+
+        public static int GetRemainingTime()
+        {
+            string sessionId = ClaimData.SessionId;
+            if (string.IsNullOrWhiteSpace(sessionId))
+            {
+                throw new Exception("Invalid Session key");
+            }
+
+            DateTime lastCallTime = Cache.AddOrGetExisting(GetCacheKey(sessionId), DateTime.Now, DefaultCacheItemPolicy);
+            TimeSpan spendTime = DateTime.Now - lastCallTime;
+            int remainingTime = SessionTimeOut - (spendTime.Minutes * 60 + spendTime.Seconds);
+
+            PingKretaServerSession(sessionId);
+
+            return remainingTime;
+        }
+
+        public static void DropSession(string sessionId)
+        {
+            Cache.Remove(GetCacheKey(sessionId));
+        }
+
+        private static void PingKretaServerSession(string sessionId)
+        {
+            SDAServer.Instance.SessionManager.PingSession(sessionId);
+        }
+    }
+}