Pull in security objects from external assembly

MediaBrowser.Common.Implementations/Security/MBLicenseFile.cs

@@ -0,0 +1,106 @@
+using MediaBrowser.Common.Configuration;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Mediabrowser.Common.Implementations.Security
+{
+    internal class MBLicenseFile
+    {
+        private readonly IApplicationPaths _appPaths;
+
+        private readonly string _filename;
+        public string RegKey
+        {
+            get { return _regKey; }
+            set
+            {
+                if (value != _regKey)
+                {
+                    //if key is changed - clear out our saved validations
+                    UpdateRecords.Clear();
+                    _regKey = value;
+                }
+            }
+        }
+
+        public string LegacyKey { get; set; }
+        private Dictionary<Guid, DateTime> UpdateRecords { get; set; }
+        private readonly object _lck = new object();
+        private string _regKey;
+
+        public MBLicenseFile(IApplicationPaths appPaths)
+        {
+            _appPaths = appPaths;
+
+            _filename = Path.Combine(_appPaths.ConfigurationDirectoryPath, "mb.lic");
+
+            UpdateRecords = new Dictionary<Guid, DateTime>();
+            Load();
+        }
+
+        public void AddRegCheck(string featureId)
+        {
+            using (var provider = new MD5CryptoServiceProvider())
+            {
+                UpdateRecords[new Guid(provider.ComputeHash(Encoding.Unicode.GetBytes(featureId)))] = DateTime.UtcNow;
+                Save();
+            }
+
+        }
+
+        public DateTime LastChecked(string featureId)
+        {
+            using (var provider = new MD5CryptoServiceProvider())
+            {
+                DateTime last;
+                lock(_lck) UpdateRecords.TryGetValue(new Guid(provider.ComputeHash(Encoding.Unicode.GetBytes(featureId))), out last);
+                return last < DateTime.UtcNow ? last : DateTime.MinValue;  // guard agains people just putting a large number in the file
+            }
+        }
+
+        private void Load()
+        {
+            string[] contents = null;
+            lock (_lck)
+            {
+                try
+                {
+                    contents = File.ReadAllLines(_filename);
+                }
+                catch (FileNotFoundException)
+                {
+                    (File.Create(_filename)).Close();
+                }
+            }
+            if (contents != null && contents.Length > 0)
+            {
+                //first line is reg key
+                RegKey = contents[0];
+                //next is legacy key
+                if (contents.Length > 1) LegacyKey = contents[1];
+                //the rest of the lines should be pairs of features and timestamps
+                for (var i = 2; i < contents.Length; i = i + 2)
+                {
+                    var feat = Guid.Parse(contents[i]);
+                    UpdateRecords[feat] = new DateTime(Convert.ToInt64(contents[i + 1]));
+                }
+            }
+        }
+
+        public void Save()
+        {
+            //build our array
+            var lines = new List<string> {RegKey, LegacyKey};
+            foreach (var pair in UpdateRecords)
+            {
+                lines.Add(pair.Key.ToString());
+                lines.Add(pair.Value.Ticks.ToString());
+            }
+
+            lock(_lck) File.WriteAllLines(_filename, lines);
+        }
+    }
+}