- Renamed NexusAPI to NexusApiClient for to match naming of MegaApi.

- Moved NexusApiClient and all of its Dtos into their own package.
- Moved util methods into a new util class.
- NexusApi no longer creates new HttpClients for each request and uses one internal HttpClient instead.
- Added rudimentary tracking of rate limits.

Wabbajack.sln

@@ -151,8 +151,8 @@ Global
 		{A47FFF32-782B-4D9F-8704-C98FB32FA8CC}.Release|x64.Build.0 = Release|Any CPU
 		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug (no commandargs)|Any CPU.ActiveCfg = Debug|Any CPU
 		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug (no commandargs)|Any CPU.Build.0 = Debug|Any CPU
-		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug (no commandargs)|x64.ActiveCfg = Debug|x64
-		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug (no commandargs)|x64.Build.0 = Debug|x64
+		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug (no commandargs)|x64.ActiveCfg = Debug|Any CPU
+		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug (no commandargs)|x64.Build.0 = Debug|Any CPU
 		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{EB003D18-DFFB-49C7-B054-FB375345AE26}.Debug|x64.ActiveCfg = Debug|Any CPU

Wabbajack/AppState.cs

@@ -12,7 +12,7 @@ using System.Windows.Input;
 using System.Windows.Media.Imaging;
 using System.Windows.Threading;
 using Wabbajack.Common;
-using Wabbajack.Properties;
+using Wabbajack.NexusApi;
 
 namespace Wabbajack
 {
@@ -92,7 +92,7 @@ namespace Wabbajack
 
         private void SetupSlideshow()
         {
-            var files = NexusAPI.CachedSlideShow;
+            var files = NexusApiClient.CachedSlideShow;
             if (files.Any())
             {
                 SlideShowElements = files.ToList();
@@ -100,7 +100,7 @@ namespace Wabbajack
         }
 
         public Random _random = new Random();
-        public List<NexusAPI.SlideShowItem> SlideShowElements = new List<NexusAPI.SlideShowItem>();
+        public List<SlideShowItem> SlideShowElements = new List<SlideShowItem>();
         private DateTime _lastSlideShowUpdate = new DateTime();
 
         public ObservableCollection<string> Log { get; }
@@ -387,11 +387,11 @@ namespace Wabbajack
             HTMLReport = _modList.ReportHTML;
             Location = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
 
-            SlideShowElements = modlist.Archives.OfType<NexusMod>().Select(m => new NexusAPI.SlideShowItem
+            SlideShowElements = modlist.Archives.OfType<NexusMod>().Select(m => new SlideShowItem
             {
-                ModName = NexusAPI.FixupSummary(m.ModName),
-                AuthorName = NexusAPI.FixupSummary(m.Author),
-                ModSummary = NexusAPI.FixupSummary(m.Summary),
+                ModName = NexusApiUtils.FixupSummary(m.ModName),
+                AuthorName = NexusApiUtils.FixupSummary(m.Author),
+                ModSummary = NexusApiUtils.FixupSummary(m.Summary),
                 ImageURL = m.SlideShowPic,
                 ModURL = m.NexusURL,
             }).ToList();

Wabbajack/Compiler.cs

@@ -16,7 +16,7 @@ using K4os.Compression.LZ4.Streams;
 using Newtonsoft.Json;
 using VFS;
 using Wabbajack.Common;
-using static Wabbajack.NexusAPI;
+using Wabbajack.NexusApi;
 using Directory = Alphaleonis.Win32.Filesystem.Directory;
 using File = Alphaleonis.Win32.Filesystem.File;
 using FileInfo = Alphaleonis.Win32.Filesystem.FileInfo;
@@ -67,7 +67,6 @@ namespace Wabbajack
         public string MO2ProfileDir => Path.Combine(MO2Folder, "profiles", MO2Profile);
 
         public List<Directive> InstallDirectives { get; private set; }
-        public string NexusKey { get; private set; }
         internal UserStatus User { get; private set; }
         public List<Archive> SelectedArchives { get; private set; }
         public List<RawSourceFile> AllFiles { get; private set; }
@@ -75,6 +74,17 @@ namespace Wabbajack
         public ConcurrentBag<Directive> ExtraFiles { get; private set; }
         public Dictionary<string, dynamic> ModInis { get; private set; }
 
+        private NexusApiClient _nexusApiClient;
+        private NexusApiClient NexusApiClient {
+            get
+            {
+                if (_nexusApiClient == null)
+                    _nexusApiClient = new NexusApiClient();
+
+                return _nexusApiClient;
+            }
+        }
+
         public VirtualFileSystem VFS => VirtualFileSystem.VFS;
 
         public List<IndexedArchive> IndexedArchives { get; private set; }
@@ -227,9 +237,8 @@ namespace Wabbajack
 
             if (IndexedArchives.Any(a => a.IniData?.General?.gameName != null))
             {
-                NexusKey = GetNexusAPIKey();
-                User = GetUserStatus(NexusKey);
-                if (!User.is_premium) Info($"User {User.name} is not a premium Nexus user, cannot continue");
+                var nexusClient = new NexusApiClient();
+                if (!nexusClient.IsPremium) Info($"User {nexusClient.Username} is not a premium Nexus user, cannot continue");
 
             }
 
@@ -484,13 +493,13 @@ namespace Wabbajack
                         ModID = general.modID,
                         Version = general.version ?? "0.0.0.0"
                     };
-                    var info = GetModInfo(nm, NexusKey);
+                    var info = _nexusApiClient.GetModInfo(nm);
                     nm.Author = info.author;
                     nm.UploadedBy = info.uploaded_by;
                     nm.UploaderProfile = info.uploaded_users_profile_url;
                     nm.ModName = info.name;
                     nm.SlideShowPic = info.picture_url;
-                    nm.NexusURL = NexusAPI.GetModURL(info.game_name, info.mod_id);
+                    nm.NexusURL = NexusApiUtils.GetModURL(info.game_name, info.mod_id);
                     nm.Summary = info.summary;
 
                     result = nm;

Wabbajack/Installer.cs

@@ -14,6 +14,7 @@ using Compression.BSA;
 using K4os.Compression.LZ4.Streams;
 using VFS;
 using Wabbajack.Common;
+using Wabbajack.NexusApi;
 using Directory = Alphaleonis.Win32.Filesystem.Directory;
 using File = Alphaleonis.Win32.Filesystem.File;
 using FileInfo = Alphaleonis.Win32.Filesystem.FileInfo;
@@ -25,6 +26,8 @@ namespace Wabbajack
     {
         private string _downloadsFolder;
 
+        private NexusApiClient _nexusApiClient;
+
         public Installer(ModList mod_list, string output_folder)
         {
             Outputfolder = output_folder;
@@ -44,7 +47,6 @@ namespace Wabbajack
         public ModList ModList { get; }
         public Dictionary<string, string> HashedArchives { get; private set; }
 
-        public string NexusAPIKey { get; set; }
         public bool IgnoreMissingFiles { get; internal set; }
         public string GameFolder { get; set; }
 
@@ -159,7 +161,7 @@ namespace Wabbajack
 
             mods.PMap(mod =>
             {
-                var er = NexusAPI.EndorseMod(mod, NexusAPIKey);
+                var er = _nexusApiClient.EndorseMod(mod);
                 Utils.Log($"Endorsed {mod.GameName} - {mod.ModID} - Result: {er.message}");
             });
             Info("Done! You may now exit the application!");
@@ -402,14 +404,19 @@ namespace Wabbajack
             Info("Getting Nexus API Key, if a browser appears, please accept");
             if (ModList.Archives.OfType<NexusMod>().Any())
             {
-                NexusAPIKey = NexusAPI.GetNexusAPIKey();
+                _nexusApiClient = new NexusApiClient();
 
-                var user_status = NexusAPI.GetUserStatus(NexusAPIKey);
-
-                if (!user_status.is_premium)
+                if (!_nexusApiClient.IsAuthenticated)
                 {
-                    Info(
-                        $"Automated installs with Wabbajack requires a premium nexus account. {user_status.name} is not a premium account");
+                    Error(
+                        $"Authenticating for the Nexus failed. A nexus account is required to automatically download mods.");
+                    return;
+                }
+
+                if (!_nexusApiClient.IsPremium)
+                {
+                    Error(
+                        $"Automated installs with Wabbajack requires a premium nexus account. {_nexusApiClient.Username} is not a premium account.");
                     return;
                 }
             }
@@ -442,7 +449,7 @@ namespace Wabbajack
                         string url;
                         try
                         {
-                            url = NexusAPI.GetNexusDownloadLink(a, NexusAPIKey, !download);
+                            url = _nexusApiClient.GetNexusDownloadLink(a, !download);
                             if (!download) return true;
                         }
                         catch (Exception ex)

Wabbajack/NexusAPI.cs

@@ -1,293 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Linq;
-using System.Net;
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Reflection;
-using System.Reflection.Emit;
-using System.Security.Authentication;
-using System.Threading.Tasks;
-using System.Windows.Media.TextFormatting;
-using Wabbajack.Common;
-using WebSocketSharp;
-
-namespace Wabbajack
-{
-    internal class NexusAPI
-    {
-        public static string GetNexusAPIKey()
-        {
-            var fi = new FileInfo("nexus.key_cache");
-            if (fi.Exists && fi.LastWriteTime > DateTime.Now.AddHours(-72)) return File.ReadAllText("nexus.key_cache");
-
-            var guid = Guid.NewGuid();
-            var _websocket = new WebSocket("wss://sso.nexusmods.com")
-            {
-                SslConfiguration =
-                {
-                    EnabledSslProtocols = SslProtocols.Tls12
-                }
-            };
-
-            var api_key = new TaskCompletionSource<string>();
-            _websocket.OnMessage += (sender, msg) => { api_key.SetResult(msg.Data); };
-
-            _websocket.Connect();
-            _websocket.Send("{\"id\": \"" + guid + "\", \"appid\": \"" + Consts.AppName + "\"}");
-
-            Process.Start($"https://www.nexusmods.com/sso?id={guid}&application=" + Consts.AppName);
-
-            api_key.Task.Wait();
-            var result = api_key.Task.Result;
-            File.WriteAllText("nexus.key_cache", result);
-            return result;
-        }
-
-        private static HttpClient BaseNexusClient(string apikey)
-        {
-            var _baseHttpClient = new HttpClient();
-
-            _baseHttpClient.DefaultRequestHeaders.Add("User-Agent", Consts.UserAgent);
-            _baseHttpClient.DefaultRequestHeaders.Add("apikey", apikey);
-            _baseHttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
-            _baseHttpClient.DefaultRequestHeaders.Add("Application-Name", Consts.AppName);
-            _baseHttpClient.DefaultRequestHeaders.Add("Application-Version",
-                $"{Assembly.GetEntryAssembly().GetName().Version}");
-            return _baseHttpClient;
-        }
-
-        public static string GetNexusDownloadLink(NexusMod archive, string apikey, bool cache = false)
-        {
-            if (cache && TryGetCachedLink(archive, apikey, out var result)) return result;
-
-            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
-            var client = BaseNexusClient(apikey);
-            string url;
-            var get_url_link = string.Format(
-                "https://api.nexusmods.com/v1/games/{0}/mods/{1}/files/{2}/download_link.json",
-                ConvertGameName(archive.GameName), archive.ModID, archive.FileID);
-            using (var s = client.GetStreamSync(get_url_link))
-            {
-                url = s.FromJSON<List<DownloadLink>>().First().URI;
-                return url;
-            }
-        }
-
-        private static bool TryGetCachedLink(NexusMod archive, string apikey, out string result)
-        {
-            if (!Directory.Exists(Consts.NexusCacheDirectory))
-                Directory.CreateDirectory(Consts.NexusCacheDirectory);
-
-
-            var path = Path.Combine(Consts.NexusCacheDirectory,
-                $"link-{archive.GameName}-{archive.ModID}-{archive.FileID}.txt");
-            if (!File.Exists(path) || DateTime.Now - new FileInfo(path).LastWriteTime > new TimeSpan(24, 0, 0))
-            {
-                File.Delete(path);
-                result = GetNexusDownloadLink(archive, apikey);
-                File.WriteAllText(path, result);
-                return true;
-            }
-
-            result = File.ReadAllText(path);
-            return true;
-        }
-
-        public static string ConvertGameName(string gameName)
-        {
-            if (gameName == "SkyrimSE") return "skyrimspecialedition";
-            if (gameName == "FalloutNV") return "newvegas";
-            return gameName.ToLower();
-        }
-
-
-        public static UserStatus GetUserStatus(string apikey)
-        {
-            var url = "https://api.nexusmods.com/v1/users/validate.json";
-            var client = BaseNexusClient(apikey);
-
-            using (var s = client.GetStreamSync(url))
-            {
-                return s.FromJSON<UserStatus>();
-            }
-        }
-
-
-        public static NexusFileInfo GetFileInfo(NexusMod mod, string apikey)
-        {
-            var url =
-                $"https://api.nexusmods.com/v1/games/{ConvertGameName(mod.GameName)}/mods/{mod.ModID}/files/{mod.FileID}.json";
-            var client = BaseNexusClient(apikey);
-
-            using (var s = client.GetStreamSync(url))
-            {
-                return s.FromJSON<NexusFileInfo>();
-            }
-        }
-
-        private const int CACHED_VERSION_NUMBER = 1;
-        public static ModInfo GetModInfo(NexusMod archive, string apikey)
-        {
-            if (!Directory.Exists(Consts.NexusCacheDirectory))
-                Directory.CreateDirectory(Consts.NexusCacheDirectory);
-
-            TOP:
-            var path = Path.Combine(Consts.NexusCacheDirectory, $"mod-info-{archive.GameName}-{archive.ModID}.json");
-            try
-            {
-                if (File.Exists(path))
-                {
-                    var result = path.FromJSON<ModInfo>();
-                    if (result._internal_version != CACHED_VERSION_NUMBER)
-                    {
-                        File.Delete(path);
-                        goto TOP;
-                    }
-
-                    return result;
-                }
-            }
-            catch (Exception)
-            {
-                File.Delete(path);
-            }
-
-
-            var url =
-                $"https://api.nexusmods.com/v1/games/{ConvertGameName(archive.GameName)}/mods/{archive.ModID}.json";
-            var client = BaseNexusClient(apikey);
-
-            using (var s = client.GetStreamSync(url))
-            {
-                var result = s.FromJSON<ModInfo>();
-                result.game_name = archive.GameName;
-                result.mod_id = archive.ModID;
-                result._internal_version = CACHED_VERSION_NUMBER;
-                result.ToJSON(path);
-                return result;
-            }
-        }
-
-
-        public static EndorsementResponse EndorseMod(NexusMod mod, string apikey)
-        {
-            Utils.Status($"Endorsing ${mod.GameName} - ${mod.ModID}");
-            var url =
-                $"https://api.nexusmods.com/v1/games/{ConvertGameName(mod.GameName)}/mods/{mod.ModID}/endorse.json";
-            var client = BaseNexusClient(apikey);
-
-            var content = new FormUrlEncodedContent(new Dictionary<string, string> {{"version", mod.Version}});
-
-            using (var s = client.PostStreamSync(url, content))
-            {
-                return s.FromJSON<EndorsementResponse>();
-            }
-        }
-
-        private class DownloadLink
-        {
-            public string URI { get; set; }
-        }
-
-
-        public class UserStatus
-        {
-            public string email;
-            public bool is_premium;
-            public bool is_supporter;
-            public string key;
-            public string name;
-            public string profile_url;
-            public string user_id;
-        }
-
-        public class NexusFileInfo
-        {
-            public ulong category_id;
-            public string category_name;
-            public string changelog_html;
-            public string description;
-            public string external_virus_scan_url;
-            public ulong file_id;
-            public string file_name;
-            public bool is_primary;
-            public string mod_version;
-            public string name;
-            public ulong size;
-            public ulong size_kb;
-            public DateTime uploaded_time;
-            public ulong uploaded_timestamp;
-            public string version;
-        }
-
-        public class ModInfo
-        {
-            public uint _internal_version;
-            public string game_name;
-            public string mod_id;
-            public string name;
-            public string summary;
-            public string author;
-            public string uploaded_by;
-            public string uploaded_users_profile_url;
-            public string picture_url;
-        }
-
-        public class SlideShowItem
-        {
-            public string ImageURL;
-            public string ModName;
-            public string ModSummary;
-            public string AuthorName;
-            public string ModURL;
-        }
-
-        public static IEnumerable<SlideShowItem> CachedSlideShow
-        {
-            get
-            {
-                if (!Directory.Exists(Consts.NexusCacheDirectory)) return new SlideShowItem[]{};
-
-                return Directory.EnumerateFiles(Consts.NexusCacheDirectory)
-                    .Where(f => f.EndsWith(".json"))
-                    .Select(f => f.FromJSON<ModInfo>())
-                    .Where(m => m._internal_version == CACHED_VERSION_NUMBER && m.picture_url != null)
-                    .Select(m => new SlideShowItem
-                    {
-                        ImageURL =  m.picture_url,
-                        ModName = FixupSummary(m.name),
-                        AuthorName = FixupSummary(m.author),
-                        ModURL = GetModURL(m.game_name, m.mod_id),
-                        ModSummary = FixupSummary(m.summary)
-                    });
-            }
-        }
-
-        public static string GetModURL(string argGameName, string argModId)
-        {
-            return $"https://nexusmods.com/{ConvertGameName(argGameName)}/mods/{argModId}";
-        }
-
-        public static string FixupSummary(string argSummary)
-        {
-            if (argSummary != null)
-            {
-                return argSummary.Replace("&#39;", "'")
-                                 .Replace("<br/>", "\n\n")
-                                 .Replace("<br />", "\n\n")
-                                 .Replace("&#33;", "!");
-            }
-
-            return argSummary;
-        }
-    }
-
-    public class EndorsementResponse
-    {
-        public string message;
-        public string status;
-    }
-}

Wabbajack/NexusApi/Dtos.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Wabbajack.NexusApi
+{
+    public class UserStatus
+    {
+        public string email;
+        public bool is_premium;
+        public bool is_supporter;
+        public string key;
+        public string name;
+        public string profile_url;
+        public string user_id;
+    }
+
+    public class NexusFileInfo
+    {
+        public ulong category_id;
+        public string category_name;
+        public string changelog_html;
+        public string description;
+        public string external_virus_scan_url;
+        public ulong file_id;
+        public string file_name;
+        public bool is_primary;
+        public string mod_version;
+        public string name;
+        public ulong size;
+        public ulong size_kb;
+        public DateTime uploaded_time;
+        public ulong uploaded_timestamp;
+        public string version;
+    }
+
+    public class ModInfo
+    {
+        public uint _internal_version;
+        public string game_name;
+        public string mod_id;
+        public string name;
+        public string summary;
+        public string author;
+        public string uploaded_by;
+        public string uploaded_users_profile_url;
+        public string picture_url;
+    }
+
+    public class SlideShowItem
+    {
+        public string ImageURL;
+        public string ModName;
+        public string ModSummary;
+        public string AuthorName;
+        public string ModURL;
+    }
+
+    public class EndorsementResponse
+    {
+        public string message;
+        public string status;
+    }
+}

Wabbajack/NexusApi/NexusApi.cs

@@ -0,0 +1,290 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Reflection;
+using System.Security.Authentication;
+using System.Threading.Tasks;
+using Wabbajack.Common;
+using static Wabbajack.NexusApi.NexusApiUtils;
+using WebSocketSharp;
+
+namespace Wabbajack.NexusApi
+{
+    internal class NexusApiClient : INotifyPropertyChanged
+    {
+        private static readonly string API_KEY_CACHE_FILE = "nexus.key_cache";
+
+        private static readonly uint CACHED_VERSION_NUMBER = 1;
+
+        
+        private readonly HttpClient _httpClient;
+
+
+        #region Authentication
+
+        private readonly string _apiKey;
+
+        public bool IsAuthenticated => _apiKey != null;
+
+        private UserStatus _userStatus;
+
+        public bool IsPremium => IsAuthenticated && _userStatus.is_premium;
+
+        public string Username => _userStatus?.name;
+
+
+        private static string GetApiKey()
+        {
+            // check if there exists a cached api key
+            var fi = new FileInfo(API_KEY_CACHE_FILE);
+            if (fi.Exists && fi.LastWriteTime > DateTime.Now.AddHours(-72))
+            {
+                return File.ReadAllText(API_KEY_CACHE_FILE);
+            }
+
+            // open a web socket to receive the api key
+            var guid = Guid.NewGuid();
+            var _websocket = new WebSocket("wss://sso.nexusmods.com")
+            {
+                SslConfiguration =
+                {
+                    EnabledSslProtocols = SslProtocols.Tls12
+                }
+            };
+
+            var api_key = new TaskCompletionSource<string>();
+            _websocket.OnMessage += (sender, msg) => { api_key.SetResult(msg.Data); };
+
+            _websocket.Connect();
+            _websocket.Send("{\"id\": \"" + guid + "\", \"appid\": \"" + Consts.AppName + "\"}");
+
+            // open a web browser to get user permission
+            Process.Start($"https://www.nexusmods.com/sso?id={guid}&application=" + Consts.AppName);
+
+            // get the api key from the socket and cache it
+            api_key.Task.Wait();
+            var result = api_key.Task.Result;
+            File.WriteAllText(API_KEY_CACHE_FILE, result);
+
+            return result;
+        }
+
+        private UserStatus GetUserStatus()
+        {
+            var url = "https://api.nexusmods.com/v1/users/validate.json";
+            return Get<UserStatus>(url);
+        }
+
+        #endregion
+
+        #region Rate Tracking
+
+        private readonly object RemainingLock = new object();
+
+        private int _dailyRemaining;
+        public int DailyRemaining
+        {
+            get
+            {
+                lock (RemainingLock)
+                {
+                    return _dailyRemaining;
+                }
+            }
+        }
+
+        private int _hourlyRemaining;
+        public int HourlyRemaining
+        {
+            get
+            {
+                lock (RemainingLock)
+                {
+                    return _hourlyRemaining;
+                }
+            }
+        }
+
+
+        private void UpdateRemaining(HttpResponseMessage response)
+        {
+            int dailyRemaining = int.Parse(response.Headers.GetValues("x-rl-daily-remaining").First());
+            int hourlyRemaining = int.Parse(response.Headers.GetValues("x-rl-hourly-remaining").First());
+
+            lock (RemainingLock)
+            {
+                _dailyRemaining = Math.Min(dailyRemaining, hourlyRemaining);
+                _hourlyRemaining = Math.Min(dailyRemaining, hourlyRemaining);
+
+                OnPropertyChanged(nameof(DailyRemaining));
+                OnPropertyChanged(nameof(HourlyRemaining));
+            }
+        }
+
+        #endregion
+
+
+        public NexusApiClient()
+        {
+            _apiKey = GetApiKey();
+            _httpClient = new HttpClient();
+
+            // set default headers for all requests to the Nexus API
+            var headers = _httpClient.DefaultRequestHeaders;
+            headers.Add("User-Agent", Consts.UserAgent);
+            headers.Add("apikey", _apiKey);
+            headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+            headers.Add("Application-Name", Consts.AppName);
+            headers.Add("Application-Version", $"{Assembly.GetEntryAssembly().GetName().Version}");
+
+            _userStatus = GetUserStatus();
+        }
+        
+        private T Get<T>(string url)
+        {
+            Task<HttpResponseMessage> responseTask = _httpClient.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
+            responseTask.Wait();
+
+            var response = responseTask.Result;
+            UpdateRemaining(response);
+
+            using (var stream = _httpClient.GetStreamSync(url))
+            {
+                return stream.FromJSON<T>();
+            }
+        }
+        
+
+        public string GetNexusDownloadLink(NexusMod archive, bool cache = false)
+        {
+            if (cache && TryGetCachedLink(archive, out var result))
+                return result;
+
+            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
+
+            var url = $"https://api.nexusmods.com/v1/games/{ConvertGameName(archive.GameName)}/mods/{archive.ModID}/files/{archive.FileID}/download_link.json";
+            return Get<List<DownloadLink>>(url).First().URI;
+        }
+
+        private bool TryGetCachedLink(NexusMod archive, out string result)
+        {
+            if (!Directory.Exists(Consts.NexusCacheDirectory))
+                Directory.CreateDirectory(Consts.NexusCacheDirectory);
+
+            var path = Path.Combine(Consts.NexusCacheDirectory, $"link-{archive.GameName}-{archive.ModID}-{archive.FileID}.txt");
+            if (!File.Exists(path) || (DateTime.Now - new FileInfo(path).LastWriteTime).TotalHours > 24)
+            {
+                File.Delete(path);
+                result = GetNexusDownloadLink(archive);
+                File.WriteAllText(path, result);
+                return true;
+            }
+
+            result = File.ReadAllText(path);
+            return true;
+        }
+
+        public NexusFileInfo GetFileInfo(NexusMod mod)
+        {
+            var url = $"https://api.nexusmods.com/v1/games/{ConvertGameName(mod.GameName)}/mods/{mod.ModID}/files/{mod.FileID}.json";
+            return Get<NexusFileInfo>(url);
+        }
+
+        public ModInfo GetModInfo(NexusMod archive)
+        {
+            if (!Directory.Exists(Consts.NexusCacheDirectory))
+                Directory.CreateDirectory(Consts.NexusCacheDirectory);
+
+            ModInfo result = null;
+            TOP:
+            var path = Path.Combine(Consts.NexusCacheDirectory, $"mod-info-{archive.GameName}-{archive.ModID}.json");
+            try
+            {
+                if (File.Exists(path))
+                {
+                    result = path.FromJSON<ModInfo>();
+                    if (result._internal_version != CACHED_VERSION_NUMBER)
+                    {
+                        File.Delete(path);
+                        goto TOP;
+                    }
+
+                    return result;
+                }
+            }
+            catch (Exception)
+            {
+                File.Delete(path);
+            }
+
+            var url = $"https://api.nexusmods.com/v1/games/{ConvertGameName(archive.GameName)}/mods/{archive.ModID}.json";
+            result = Get<ModInfo>(url);
+
+            result.game_name = archive.GameName;
+            result.mod_id = archive.ModID;
+            result._internal_version = CACHED_VERSION_NUMBER;
+            result.ToJSON(path);
+            return result;
+        }
+
+        public EndorsementResponse EndorseMod(NexusMod mod)
+        {
+            Utils.Status($"Endorsing ${mod.GameName} - ${mod.ModID}");
+            var url = $"https://api.nexusmods.com/v1/games/{ConvertGameName(mod.GameName)}/mods/{mod.ModID}/endorse.json";
+
+            var content = new FormUrlEncodedContent(new Dictionary<string, string> {{"version", mod.Version}});
+
+            using (var stream = _httpClient.PostStreamSync(url, content))
+            {
+                return stream.FromJSON<EndorsementResponse>();
+            }
+        }
+
+
+        public static IEnumerable<SlideShowItem> CachedSlideShow
+        {
+            get
+            {
+                if (!Directory.Exists(Consts.NexusCacheDirectory)) return new SlideShowItem[]{};
+
+                return Directory.EnumerateFiles(Consts.NexusCacheDirectory)
+                    .Where(f => f.EndsWith(".json"))
+                    .Select(f => f.FromJSON<ModInfo>())
+                    .Where(m => m._internal_version == CACHED_VERSION_NUMBER && m.picture_url != null)
+                    .Select(m => new SlideShowItem
+                    {
+                        ImageURL =  m.picture_url,
+                        ModName = FixupSummary(m.name),
+                        AuthorName = FixupSummary(m.author),
+                        ModURL = GetModURL(m.game_name, m.mod_id),
+                        ModSummary = FixupSummary(m.summary)
+                    });
+            }
+        }
+
+
+        private class DownloadLink
+        {
+            public string URI { get; set; }
+        }
+
+
+        #region INotifyPropertyChanged
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private void OnPropertyChanged(string name)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+        }
+
+        #endregion
+    }
+
+}

Wabbajack/NexusApi/NexusApiUtils.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Wabbajack.NexusApi
+{
+    public sealed class NexusApiUtils
+    {
+        public static string ConvertGameName(string gameName)
+        {
+            if (gameName == "SkyrimSE") return "skyrimspecialedition";
+            if (gameName == "FalloutNV") return "newvegas";
+            return gameName.ToLower();
+        }
+
+        public static string GetModURL(string argGameName, string argModId)
+        {
+            return $"https://nexusmods.com/{ConvertGameName(argGameName)}/mods/{argModId}";
+        }
+
+        public static string FixupSummary(string argSummary)
+        {
+            if (argSummary != null)
+            {
+                return argSummary.Replace("'", "'")
+                                 .Replace("<br/>", "\n\n")
+                                 .Replace("<br />", "\n\n")
+                                 .Replace("&#33;", "!");
+            }
+
+            return argSummary;
+        }
+    }
+}

Wabbajack/ReportBuilder.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using Wabbajack.Common;
+using Wabbajack.NexusApi;
 
 namespace Wabbajack
 {
@@ -51,9 +52,9 @@ namespace Wabbajack
                 {
                     case NexusMod m:
                         var profile = m.UploaderProfile.Replace("/games/",
-                            "/" + NexusAPI.ConvertGameName(m.GameName).ToLower() + "/");
+                            "/" + NexusApiUtils.ConvertGameName(m.GameName).ToLower() + "/");
                         NoWrapText(
-                            $"* [{m.Name}](http://nexusmods.com/{NexusAPI.ConvertGameName(m.GameName)}/mods/{m.ModID})");
+                            $"* [{m.Name}](http://nexusmods.com/{NexusApiUtils.ConvertGameName(m.GameName)}/mods/{m.ModID})");
                         NoWrapText($"    * Author : [{m.UploadedBy}]({profile})");
                         NoWrapText($"    * Version : {m.Version}");
                         break;

Wabbajack/Wabbajack.csproj

@@ -182,6 +182,8 @@
     </ApplicationDefinition>
     <Compile Include="Data.cs" />
     <Compile Include="LambdaCommand.cs" />
+    <Compile Include="NexusApi\Dtos.cs" />
+    <Compile Include="NexusApi\NexusApiUtils.cs" />
     <Compile Include="ModeSelectionWindow.xaml.cs">
       <DependentUpon>ModeSelectionWindow.xaml</DependentUpon>
     </Compile>
@@ -216,7 +218,7 @@
     </Page>
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="NexusAPI.cs" />
+    <Compile Include="NexusApi\NexusApi.cs" />
     <Compile Include="Properties\AssemblyInfo.cs">
       <SubType>Code</SubType>
     </Compile>