Merge pull request 'add basic download caching' (#10) from waffle.lord/SPT-AKI-Installer:master into master

Reviewed-on: CWX/SPT-AKI-Installer#10

Aki.Core/Tasks/DownloadTask.cs

@@ -20,22 +20,20 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
 
         private async Task<GenericResult> BuildMirrorList()
         {
-            var mirrorListInfo = new FileInfo(Path.Join(_data.TargetInstallPath, "mirrors.json"));
-
             SetStatus("Downloading Mirror List", false);
 
             var progress = new Progress<double>((d) => { Progress = (int)Math.Floor(d); });
 
-            var downloadResult = await DownloadHelper.DownloadFile(mirrorListInfo, _data.PatcherMirrorsLink, progress);
+            var file = await DownloadCacheHelper.GetOrDownloadFileAsync("mirrors.json", _data.PatcherMirrorsLink, progress);
 
-            if (!downloadResult.Succeeded)
+            if (file == null)
             {
-                return downloadResult;
+                return GenericResult.FromError("Failed to download mirror list");
             }
 
-            var blah = JsonConvert.DeserializeObject<List<DownloadMirror>>(File.ReadAllText(mirrorListInfo.FullName));
+            var mirrorsList = JsonConvert.DeserializeObject<List<DownloadMirror>>(File.ReadAllText(file.FullName));
 
-            if (blah is List<DownloadMirror> mirrors)
+            if (mirrorsList is List<DownloadMirror> mirrors)
             {
                 _data.PatcherReleaseMirrors = mirrors;
 
@@ -63,30 +61,26 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
                     try
                     {
                         using var megaDownloadStream = await megaClient.DownloadAsync(new Uri(mirror.Link), progress);
-                        using var patcherFileStream = _data.PatcherZipInfo.Open(FileMode.Create);
-                        {
-                            await megaDownloadStream.CopyToAsync(patcherFileStream);
-                        }
 
-                        patcherFileStream.Close();
+                        _data.PatcherZipInfo = await DownloadCacheHelper.GetOrDownloadFileAsync("patcher.zip", megaDownloadStream, mirror.Hash);
 
-                        if(!DownloadHelper.FileHashCheck(_data.PatcherZipInfo, mirror.Hash))
+                        if(_data.PatcherZipInfo == null)
                         {
-                            return GenericResult.FromError("Hash mismatch");
+                            continue;
                         }
 
                         return GenericResult.FromSuccess();
                     }
-                    catch (Exception)
+                    catch
                     {
                         //most likely a 509 (Bandwidth limit exceeded) due to mega's user quotas.
                         continue;
                     }
                 }
 
-                var result = await DownloadHelper.DownloadFile(_data.PatcherZipInfo, mirror.Link, progress, mirror.Hash);
+                _data.PatcherZipInfo = await DownloadCacheHelper.GetOrDownloadFileAsync("patcher.zip", mirror.Link, progress, mirror.Hash);
 
-                if (result.Succeeded)
+                if (_data.PatcherZipInfo != null)
                 {
                     return GenericResult.FromSuccess();
                 }
@@ -97,13 +91,8 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
 
         public override async Task<GenericResult> RunAsync()
         {
-            _data.PatcherZipInfo = new FileInfo(Path.Join(_data.TargetInstallPath, "patcher.zip"));
-            _data.AkiZipInfo = new FileInfo(Path.Join(_data.TargetInstallPath, "sptaki.zip"));
-
             if (_data.PatchNeeded)
             {
-                if (_data.PatcherZipInfo.Exists) _data.PatcherZipInfo.Delete();
-
                 var buildResult = await BuildMirrorList();
 
                 if (!buildResult.Succeeded)
@@ -122,19 +111,17 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
                 }
             }
 
-            if (_data.AkiZipInfo.Exists) _data.AkiZipInfo.Delete();
-
             SetStatus("Downloading SPT-AKI", false);
 
             Progress = 0;
 
             var akiProgress = new Progress<double>((d) => { Progress = (int)Math.Floor(d); });
 
-            var releaseDownloadResult = await DownloadHelper.DownloadFile(_data.AkiZipInfo, _data.AkiReleaseDownloadLink, akiProgress);
+            _data.AkiZipInfo = await DownloadCacheHelper.GetOrDownloadFileAsync("sptaki.zip", _data.AkiReleaseDownloadLink, akiProgress);
 
-            if (!releaseDownloadResult.Succeeded)
+            if (_data.AkiZipInfo == null)
             {
-                return releaseDownloadResult;
+                return GenericResult.FromError("Failed to download spt-aki");
             }
 
             return GenericResult.FromSuccess();

Aki.Core/Tasks/SetupClientTask.cs

@@ -31,8 +31,6 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
 
                 var extractPatcherProgress = new Progress<double>((d) => { Progress = (int)Math.Floor(d); });
 
-                
-
                 var extractPatcherResult = ZipHelper.Decompress(_data.PatcherZipInfo, patcherOutputDir, extractPatcherProgress);
 
                 if (!extractPatcherResult.Succeeded)
@@ -65,7 +63,6 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
                 {
                     return patchingResult;
                 }
-
             }
 
             
@@ -92,9 +89,6 @@ namespace SPT_AKI_Installer.Aki.Core.Tasks
                 patcherOutputDir.Delete(true);
                 patcherEXE.Delete();
             }
-            
-            _data.PatcherZipInfo.Delete();
-            _data.AkiZipInfo.Delete();
 
             return GenericResult.FromSuccess("SPT is Setup. Happy Playing!");
         }

Aki.Helper/DownloadCacheHelper.cs

@@ -0,0 +1,140 @@
+using HttpClientProgress;
+using SPT_AKI_Installer.Aki.Core.Model;
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace SPT_AKI_Installer.Aki.Helper
+{
+    public static class DownloadCacheHelper
+    {
+        private static HttpClient _httpClient = new HttpClient() { Timeout = TimeSpan.FromHours(1) };
+
+        private static string _cachePath = Path.Join(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "spt-installer/cache");
+
+        private static async Task<GenericResult> DownloadFile(FileInfo outputFile, string targetLink, IProgress<double> progress, string expectedHash = null)
+        {
+            try
+            {
+                // Use the provided extension method
+                using (var file = new FileStream(outputFile.FullName, FileMode.Create, FileAccess.Write, FileShare.None))
+                    await _httpClient.DownloadDataAsync(targetLink, file, progress);
+
+                outputFile.Refresh();
+
+                if (!outputFile.Exists)
+                {
+                    return GenericResult.FromError($"Failed to download {outputFile.Name}");
+                }
+
+                if (expectedHash != null && !FileHashHelper.CheckHash(outputFile, expectedHash))
+                {
+                    return GenericResult.FromError("Hash mismatch");
+                }
+
+                return GenericResult.FromSuccess();
+            }
+            catch (Exception ex)
+            {
+                return GenericResult.FromError(ex.Message);
+            }
+        }
+
+        private static async Task<GenericResult> ProcessInboundStreamAsync(FileInfo cacheFile, Stream downloadStream, string expectedHash = null)
+        {
+            try
+            {
+                cacheFile.Refresh();
+                Directory.CreateDirectory(_cachePath);
+
+                if (cacheFile.Exists)
+                {
+                    if (expectedHash != null && FileHashHelper.CheckHash(cacheFile, expectedHash))
+                    {
+                        return GenericResult.FromSuccess();
+                    }
+
+                    cacheFile.Delete();
+                    cacheFile.Refresh();
+                }
+
+                using var patcherFileStream = cacheFile.Open(FileMode.Create);
+                {
+                    await downloadStream.CopyToAsync(patcherFileStream);
+                }
+
+                patcherFileStream.Close();
+
+                if (expectedHash != null && !FileHashHelper.CheckHash(cacheFile, expectedHash))
+                {
+                    return GenericResult.FromError("Hash mismatch");
+                }
+
+                return GenericResult.FromSuccess();
+            }
+            catch(Exception ex)
+            {
+                return GenericResult.FromError(ex.Message);
+            }
+        }
+
+        private static async Task<GenericResult> ProcessInboundFileAsync(FileInfo cacheFile, string targetLink, IProgress<double> progress, string expectedHash = null)
+        {
+            try
+            {
+                cacheFile.Refresh();
+                Directory.CreateDirectory(_cachePath);
+
+                if (cacheFile.Exists)
+                {
+                    if (expectedHash != null && FileHashHelper.CheckHash(cacheFile, expectedHash))
+                    {
+                        return GenericResult.FromSuccess();
+                    }
+
+                    cacheFile.Delete();
+                    cacheFile.Refresh();
+                }
+
+                return await DownloadFile(cacheFile, targetLink, progress, expectedHash);
+            }
+            catch(Exception ex)
+            {
+                return GenericResult.FromError(ex.Message);
+            }
+        }
+
+        public static async Task<FileInfo> GetOrDownloadFileAsync(string fileName, string targetLink, IProgress<double> progress, string expectedHash = null)
+        {
+            FileInfo cacheFile = new FileInfo(Path.Join(_cachePath, fileName));
+
+            try
+            {
+                var result = await ProcessInboundFileAsync(cacheFile, targetLink, progress, expectedHash);
+
+                return result.Succeeded ? cacheFile : null;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        public static async Task<FileInfo> GetOrDownloadFileAsync(string fileName, Stream fileDownloadStream, string expectedHash = null)
+        {
+            FileInfo cacheFile = new FileInfo(Path.Join(_cachePath, fileName));
+
+            try
+            {
+                var result = await ProcessInboundStreamAsync(cacheFile, fileDownloadStream, expectedHash);
+
+                return result.Succeeded ? cacheFile : null;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+    }
+}

Aki.Helper/DownloadHelper.cs

@@ -1,63 +0,0 @@
-using HttpClientProgress;
-using SPT_AKI_Installer.Aki.Core.Model;
-using System;
-using System.IO;
-using System.Linq;
-using System.Net.Http;
-using System.Security.Cryptography;
-using System.Threading.Tasks;
-
-namespace SPT_AKI_Installer.Aki.Helper
-{
-    public static class DownloadHelper
-    {
-        private static HttpClient _httpClient = new HttpClient() { Timeout = TimeSpan.FromHours(1) };
-
-        public static bool FileHashCheck(FileInfo file, string expectedHash)
-        {
-            using (MD5 md5Service = MD5.Create())
-            using (var sourceStream = file.OpenRead())
-            {
-                byte[] sourceHash = md5Service.ComputeHash(sourceStream);
-                byte[] expectedHashBytes = Convert.FromBase64String(expectedHash);
-
-                bool matched = Enumerable.SequenceEqual(sourceHash, expectedHashBytes);
-
-                return matched;
-            }
-        }
-
-
-        public static async Task<GenericResult> DownloadFile(FileInfo outputFile, string targetLink, IProgress<double> progress, string expectedHash = null)
-        {
-            try
-            {
-                outputFile.Refresh();
-
-                if (outputFile.Exists) outputFile.Delete();
-
-                // Use the provided extension method
-                using (var file = new FileStream(outputFile.FullName, FileMode.Create, FileAccess.Write, FileShare.None))
-                    await _httpClient.DownloadDataAsync(targetLink, file, progress);
-
-                outputFile.Refresh();
-
-                if (!outputFile.Exists)
-                {
-                    return GenericResult.FromError($"Failed to download {outputFile.Name}");
-                }
-
-                if (expectedHash != null && !FileHashCheck(outputFile, expectedHash))
-                {
-                    return GenericResult.FromError("Hash mismatch");
-                }
-
-                return GenericResult.FromSuccess();
-            }
-            catch (Exception ex)
-            {
-                return GenericResult.FromError(ex.Message);
-            }
-        }
-    }
-}

Aki.Helper/FileHashHelper.cs

@@ -0,0 +1,24 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+
+namespace SPT_AKI_Installer.Aki.Helper
+{
+    public static class FileHashHelper
+    {
+        public static bool CheckHash(FileInfo file, string expectedHash)
+        {
+            using (MD5 md5Service = MD5.Create())
+            using (var sourceStream = file.OpenRead())
+            {
+                byte[] sourceHash = md5Service.ComputeHash(sourceStream);
+                byte[] expectedHashBytes = Convert.FromBase64String(expectedHash);
+
+                bool matched = Enumerable.SequenceEqual(sourceHash, expectedHashBytes);
+
+                return matched;
+            }
+        }
+    }
+}