cleaned up app update

NzbDrone.Core/Update/AvailableUpdateService.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using NzbDrone.Common;
+using NzbDrone.Core.Configuration;
+
+namespace NzbDrone.Core.Update
+{
+    public interface IAvailableUpdateService
+    {
+        IEnumerable<UpdatePackage> GetAvailablePackages();
+    }
+
+    public class AvailableUpdateService : IAvailableUpdateService
+    {
+        private readonly IConfigService _configService;
+        private readonly IHttpProvider _httpProvider;
+
+        private static readonly Regex ParseRegex = new Regex(@"(?:\>)(?<filename>NzbDrone.+?(?<version>\d+\.\d+\.\d+\.\d+).+?)(?:\<\/A\>)", RegexOptions.IgnoreCase);
+
+        public AvailableUpdateService(IConfigService configService, IHttpProvider httpProvider)
+        {
+            _configService = configService;
+            _httpProvider = httpProvider;
+        }
+
+        public IEnumerable<UpdatePackage> GetAvailablePackages()
+        {
+            var updateList = new List<UpdatePackage>();
+            var updateUrl = _configService.UpdateUrl;
+            var rawUpdateList = _httpProvider.DownloadString(updateUrl);
+            var matches = ParseRegex.Matches(rawUpdateList);
+
+            foreach (Match match in matches)
+            {
+                var updatePackage = new UpdatePackage();
+                updatePackage.FileName = match.Groups["filename"].Value;
+                updatePackage.Url = updateUrl + updatePackage.FileName;
+                updatePackage.Version = new Version(match.Groups["version"].Value);
+                updateList.Add(updatePackage);
+            }
+
+            return updateList;
+        }
+    }
+}