Initial Push

src/Prowlarr.Api.V1/Update/UpdateModule.cs

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+using System.Collections.Generic;
+using System.Linq;
+using NzbDrone.Common.EnvironmentInfo;
+using NzbDrone.Core.Update;
+using Prowlarr.Http;
+
+namespace Prowlarr.Api.V1.Update
+{
+    public class UpdateModule : ProwlarrRestModule<UpdateResource>
+    {
+        private readonly IRecentUpdateProvider _recentUpdateProvider;
+
+        public UpdateModule(IRecentUpdateProvider recentUpdateProvider)
+        {
+            _recentUpdateProvider = recentUpdateProvider;
+            GetResourceAll = GetRecentUpdates;
+        }
+
+        private List<UpdateResource> GetRecentUpdates()
+        {
+            var resources = _recentUpdateProvider.GetRecentUpdatePackages()
+                                                 .OrderByDescending(u => u.Version)
+                                                 .ToResource();
+
+            if (resources.Any())
+            {
+                var first = resources.First();
+                first.Latest = true;
+
+                if (first.Version > BuildInfo.Version)
+                {
+                    first.Installable = true;
+                }
+
+                var installed = resources.SingleOrDefault(r => r.Version == BuildInfo.Version);
+
+                if (installed != null)
+                {
+                    installed.Installed = true;
+                }
+            }
+
+            return resources;
+        }
+    }
+}

src/Prowlarr.Api.V1/Update/UpdateResource.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json;
+using NzbDrone.Core.Update;
+using Prowlarr.Http.REST;
+
+namespace Prowlarr.Api.V1.Update
+{
+    public class UpdateResource : RestResource
+    {
+        [JsonConverter(typeof(Newtonsoft.Json.Converters.VersionConverter))]
+        public Version Version { get; set; }
+
+        public string Branch { get; set; }
+        public DateTime ReleaseDate { get; set; }
+        public string FileName { get; set; }
+        public string Url { get; set; }
+        public bool Installed { get; set; }
+        public bool Installable { get; set; }
+        public bool Latest { get; set; }
+        public UpdateChanges Changes { get; set; }
+        public string Hash { get; set; }
+    }
+
+    public static class UpdateResourceMapper
+    {
+        public static UpdateResource ToResource(this UpdatePackage model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+
+            return new UpdateResource
+            {
+                Version = model.Version,
+
+                Branch = model.Branch,
+                ReleaseDate = model.ReleaseDate,
+                FileName = model.FileName,
+                Url = model.Url,
+
+                //Installed
+                //Installable
+                //Latest
+                Changes = model.Changes,
+                Hash = model.Hash,
+            };
+        }
+
+        public static List<UpdateResource> ToResource(this IEnumerable<UpdatePackage> models)
+        {
+            return models.Select(ToResource).ToList();
+        }
+    }
+}