♻️ Refactored files service

DysonNetwork.Drive/Storage/CloudFileUnusedRecyclingJob.cs

@@ -6,7 +6,6 @@ namespace DysonNetwork.Drive.Storage;
 
 public class CloudFileUnusedRecyclingJob(
     AppDatabase db,
-    FileReferenceService fileRefService,
     ILogger<CloudFileUnusedRecyclingJob> logger,
     IConfiguration configuration
 )
@@ -80,15 +79,15 @@ public class CloudFileUnusedRecyclingJob(
             processedCount += fileBatch.Count;
             lastProcessedId = fileBatch.Last();
 
-            // Get all relevant file references for this batch
-            var fileReferences = await fileRefService.GetReferencesAsync(fileBatch);
-
-            // Filter to find files that have no references or all expired references
-            var filesToMark = fileBatch.Where(fileId =>
-                !fileReferences.TryGetValue(fileId, out var references) ||
-                references.Count == 0 ||
-                references.All(r => r.ExpiredAt.HasValue && r.ExpiredAt.Value <= now)
-            ).ToList();
+            // Optimized query: Find files that have no references OR all references are expired
+            // This replaces the memory-intensive approach of loading all references
+            var filesToMark = await db.Files
+                .Where(f => fileBatch.Contains(f.Id))
+                .Where(f => !db.FileReferences.Any(r => r.FileId == f.Id) || // No references at all
+                           !db.FileReferences.Any(r => r.FileId == f.Id && // OR has references but all are expired
+                                                     (r.ExpiredAt == null || r.ExpiredAt > now)))
+                .Select(f => f.Id)
+                .ToListAsync();
 
             if (filesToMark.Count > 0)
             {

DysonNetwork.Drive/Storage/FileController.cs

@@ -29,37 +29,53 @@ public class FileController(
         [FromQuery] string? passcode = null
     )
     {
-        // Support the file extension for client side data recognize
-        string? fileExtension = null;
-        if (id.Contains('.'))
-        {
-            var splitId = id.Split('.');
-            id = splitId.First();
-            fileExtension = splitId.Last();
-        }
-
-        var file = await fs.GetFileAsync(id);
+        var (fileId, fileExtension) = ParseFileId(id);
+        var file = await fs.GetFileAsync(fileId);
         if (file is null) return NotFound("File not found.");
 
+        var accessResult = await ValidateFileAccess(file, passcode);
+        if (accessResult is not null) return accessResult;
+
+        // Handle direct storage URL redirect
+        if (!string.IsNullOrWhiteSpace(file.StorageUrl))
+            return Redirect(file.StorageUrl);
+
+        // Handle files not yet uploaded to remote storage
+        if (file.UploadedAt is null)
+            return await ServeLocalFile(file);
+
+        // Handle uploaded files
+        return await ServeRemoteFile(file, fileExtension, download, original, thumbnail, overrideMimeType);
+    }
+
+    private (string fileId, string? extension) ParseFileId(string id)
+    {
+        if (!id.Contains('.')) return (id, null);
+
+        var parts = id.Split('.');
+        return (parts.First(), parts.Last());
+    }
+
+    private async Task<ActionResult?> ValidateFileAccess(SnCloudFile file, string? passcode)
+    {
         if (file.Bundle is not null && !file.Bundle.VerifyPasscode(passcode))
             return StatusCode(StatusCodes.Status403Forbidden, "The passcode is incorrect.");
+        return null;
+    }
 
-        if (!string.IsNullOrWhiteSpace(file.StorageUrl)) return Redirect(file.StorageUrl);
-
-        if (file.UploadedAt is null)
+    private async Task<ActionResult> ServeLocalFile(SnCloudFile file)
     {
-            // File is not yet uploaded to remote storage. Try to serve from local temp storage.
+        // Try temp storage first
         var tempFilePath = Path.Combine(Path.GetTempPath(), file.Id);
         if (System.IO.File.Exists(tempFilePath))
         {
             if (file.IsEncrypted)
-                {
                 return StatusCode(StatusCodes.Status403Forbidden, "Encrypted files cannot be accessed before they are processed and stored.");
-                }
+
             return PhysicalFile(tempFilePath, file.MimeType ?? "application/octet-stream", file.Name, enableRangeProcessing: true);
         }
 
-            // Fallback for tus uploads that are not processed yet.
+        // Fallback for tus uploads
         var tusStorePath = configuration.GetValue<string>("Tus:StorePath");
         if (!string.IsNullOrEmpty(tusStorePath))
         {
@@ -73,81 +89,98 @@ public class FileController(
         return StatusCode(StatusCodes.Status400BadRequest, "File is being processed. Please try again later.");
     }
 
+    private async Task<ActionResult> ServeRemoteFile(
+        SnCloudFile file,
+        string? fileExtension,
+        bool download,
+        bool original,
+        bool thumbnail,
+        string? overrideMimeType
+    )
+    {
         if (!file.PoolId.HasValue)
             return StatusCode(StatusCodes.Status500InternalServerError, "File is in an inconsistent state: uploaded but no pool ID.");
 
         var pool = await fs.GetPoolAsync(file.PoolId.Value);
         if (pool is null)
             return StatusCode(StatusCodes.Status410Gone, "The pool of the file no longer exists or not accessible.");
-        var dest = pool.StorageConfig;
 
-        if (!pool.PolicyConfig.AllowAnonymous)
-            if (HttpContext.Items["CurrentUser"] is not Account currentUser)
+        if (!pool.PolicyConfig.AllowAnonymous && HttpContext.Items["CurrentUser"] is not Account)
             return Unauthorized();
-        // TODO: Provide ability to add access log
 
-        var fileName = string.IsNullOrWhiteSpace(file.StorageId) ? file.Id : file.StorageId;
+        var dest = pool.StorageConfig;
+        var fileName = BuildRemoteFileName(file, original, thumbnail);
 
-        switch (thumbnail)
-        {
-            case true when file.HasThumbnail:
-                fileName += ".thumbnail";
-                break;
-            case true when !file.HasThumbnail:
-                return NotFound();
+        // Try proxy redirects first
+        var proxyResult = TryProxyRedirect(file, dest, fileName);
+        if (proxyResult is not null) return proxyResult;
+
+        // Handle signed URLs
+        if (dest.EnableSigned)
+            return await CreateSignedUrl(file, dest, fileName, fileExtension, download, overrideMimeType);
+
+        // Fallback to direct S3 endpoint
+        var protocol = dest.EnableSsl ? "https" : "http";
+        return Redirect($"{protocol}://{dest.Endpoint}/{dest.Bucket}/{fileName}");
     }
 
-        if (!original && file.HasCompression)
-            fileName += ".compressed";
+    private string BuildRemoteFileName(SnCloudFile file, bool original, bool thumbnail)
+    {
+        var fileName = string.IsNullOrWhiteSpace(file.StorageId) ? file.Id : file.StorageId;
 
+        if (thumbnail)
+        {
+            if (!file.HasThumbnail) throw new InvalidOperationException("Thumbnail not available");
+            fileName += ".thumbnail";
+        }
+        else if (!original && file.HasCompression)
+        {
+            fileName += ".compressed";
+        }
+
+        return fileName;
+    }
+
+    private ActionResult? TryProxyRedirect(SnCloudFile file, RemoteStorageConfig dest, string fileName)
+    {
         if (dest.ImageProxy is not null && (file.MimeType?.StartsWith("image/") ?? false))
         {
-            var proxyUrl = dest.ImageProxy;
-            var baseUri = new Uri(proxyUrl.EndsWith('/') ? proxyUrl : $"{proxyUrl}/");
-            var fullUri = new Uri(baseUri, fileName);
-            return Redirect(fullUri.ToString());
+            return Redirect(BuildProxyUrl(dest.ImageProxy, fileName));
         }
 
         if (dest.AccessProxy is not null)
         {
-            var proxyUrl = dest.AccessProxy;
-            var baseUri = new Uri(proxyUrl.EndsWith('/') ? proxyUrl : $"{proxyUrl}/");
-            var fullUri = new Uri(baseUri, fileName);
-            return Redirect(fullUri.ToString());
+            return Redirect(BuildProxyUrl(dest.AccessProxy, fileName));
         }
 
-        if (dest.EnableSigned)
+        return null;
+    }
+
+    private string BuildProxyUrl(string proxyUrl, string fileName)
+    {
+        var baseUri = new Uri(proxyUrl.EndsWith('/') ? proxyUrl : $"{proxyUrl}/");
+        var fullUri = new Uri(baseUri, fileName);
+        return fullUri.ToString();
+    }
+
+    private async Task<ActionResult> CreateSignedUrl(
+        SnCloudFile file,
+        RemoteStorageConfig dest,
+        string fileName,
+        string? fileExtension,
+        bool download,
+        string? overrideMimeType
+    )
     {
         var client = fs.CreateMinioClient(dest);
         if (client is null)
-                return BadRequest(
-                    "Failed to configure client for remote destination, file got an invalid storage remote."
-                );
+            return BadRequest("Failed to configure client for remote destination, file got an invalid storage remote.");
 
-            var headers = new Dictionary<string, string>();
-            if (fileExtension is not null)
-            {
-                if (MimeTypes.TryGetMimeType(fileExtension, out var mimeType))
-                    headers.Add("Response-Content-Type", mimeType);
-            }
-            else if (overrideMimeType is not null)
-            {
-                headers.Add("Response-Content-Type", overrideMimeType);
-            }
-            else if (file.MimeType is not null && !file.MimeType!.EndsWith("unknown"))
-            {
-                headers.Add("Response-Content-Type", file.MimeType);
-            }
+        var headers = BuildSignedUrlHeaders(file, fileExtension, overrideMimeType, download);
 
-            if (download)
-            {
-                headers.Add("Response-Content-Disposition", $"attachment; filename=\"{file.Name}\"");
-            }
-
-            var bucket = dest.Bucket;
         var openUrl = await client.PresignedGetObjectAsync(
             new PresignedGetObjectArgs()
-                    .WithBucket(bucket)
+                .WithBucket(dest.Bucket)
                 .WithObject(fileName)
                 .WithExpiry(3600)
                 .WithHeaders(headers)
@@ -156,10 +189,40 @@ public class FileController(
         return Redirect(openUrl);
     }
 
-        // Fallback redirect to the S3 endpoint (public read)
-        var protocol = dest.EnableSsl ? "https" : "http";
-        // Use the path bucket lookup mode
-        return Redirect($"{protocol}://{dest.Endpoint}/{dest.Bucket}/{fileName}");
+    private Dictionary<string, string> BuildSignedUrlHeaders(
+        SnCloudFile file,
+        string? fileExtension,
+        string? overrideMimeType,
+        bool download
+    )
+    {
+        var headers = new Dictionary<string, string>();
+
+        string? contentType = null;
+        if (fileExtension is not null && MimeTypes.TryGetMimeType(fileExtension, out var mimeType))
+        {
+            contentType = mimeType;
+        }
+        else if (overrideMimeType is not null)
+        {
+            contentType = overrideMimeType;
+        }
+        else if (file.MimeType is not null && !file.MimeType.EndsWith("unknown"))
+        {
+            contentType = file.MimeType;
+        }
+
+        if (contentType is not null)
+        {
+            headers.Add("Response-Content-Type", contentType);
+        }
+
+        if (download)
+        {
+            headers.Add("Response-Content-Disposition", $"attachment; filename=\"{file.Name}\"");
+        }
+
+        return headers;
     }
 
     [HttpGet("{id}/info")]
@@ -175,14 +238,7 @@ public class FileController(
     [HttpPatch("{id}/name")]
     public async Task<ActionResult<SnCloudFile>> UpdateFileName(string id, [FromBody] string name)
     {
-        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
-        var accountId = Guid.Parse(currentUser.Id);
-        var file = await db.Files.FirstOrDefaultAsync(f => f.Id == id && f.AccountId == accountId);
-        if (file is null) return NotFound();
-        file.Name = name;
-        await db.SaveChangesAsync();
-        await fs._PurgeCacheAsync(file.Id);
-        return file;
+        return await UpdateFileProperty(id, file => file.Name = name);
     }
 
     public class MarkFileRequest
@@ -194,27 +250,28 @@ public class FileController(
     [HttpPut("{id}/marks")]
     public async Task<ActionResult<SnCloudFile>> MarkFile(string id, [FromBody] MarkFileRequest request)
     {
-        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
-        var accountId = Guid.Parse(currentUser.Id);
-        var file = await db.Files.FirstOrDefaultAsync(f => f.Id == id && f.AccountId == accountId);
-        if (file is null) return NotFound();
-        file.SensitiveMarks = request.SensitiveMarks;
-        await db.SaveChangesAsync();
-        await fs._PurgeCacheAsync(file.Id);
-        return file;
+        return await UpdateFileProperty(id, file => file.SensitiveMarks = request.SensitiveMarks);
     }
 
     [Authorize]
     [HttpPut("{id}/meta")]
     public async Task<ActionResult<SnCloudFile>> UpdateFileMeta(string id, [FromBody] Dictionary<string, object?> meta)
+    {
+        return await UpdateFileProperty(id, file => file.UserMeta = meta);
+    }
+
+    private async Task<ActionResult<SnCloudFile>> UpdateFileProperty(string fileId, Action<SnCloudFile> updateAction)
     {
         if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
         var accountId = Guid.Parse(currentUser.Id);
-        var file = await db.Files.FirstOrDefaultAsync(f => f.Id == id && f.AccountId == accountId);
+
+        var file = await db.Files.FirstOrDefaultAsync(f => f.Id == fileId && f.AccountId == accountId);
         if (file is null) return NotFound();
-        file.UserMeta = meta;
+
+        updateAction(file);
         await db.SaveChangesAsync();
         await fs._PurgeCacheAsync(file.Id);
+
         return file;
     }
 

DysonNetwork.Drive/Storage/FileExpirationJob.cs

@@ -14,49 +14,55 @@ public class FileExpirationJob(AppDatabase db, FileService fileService, ILogger<
         var now = SystemClock.Instance.GetCurrentInstant();
         logger.LogInformation("Running file reference expiration job at {now}", now);
 
-        // Find all expired references
-        var expiredReferences = await db.FileReferences
+        // Delete expired references in bulk and get affected file IDs
+        var affectedFileIds = await db.FileReferences
             .Where(r => r.ExpiredAt < now && r.ExpiredAt != null)
+            .Select(r => r.FileId)
+            .Distinct()
             .ToListAsync();
 
-        if (!expiredReferences.Any())
+        if (!affectedFileIds.Any())
         {
             logger.LogInformation("No expired file references found");
             return;
         }
 
-        logger.LogInformation("Found {count} expired file references", expiredReferences.Count);
+        logger.LogInformation("Found expired references for {count} files", affectedFileIds.Count);
 
-        // Get unique file IDs
-        var fileIds = expiredReferences.Select(r => r.FileId).Distinct().ToList();
-        var filesAndReferenceCount = new Dictionary<string, int>();
+        // Delete expired references in bulk
+        var deletedReferencesCount = await db.FileReferences
+            .Where(r => r.ExpiredAt < now && r.ExpiredAt != null)
+            .ExecuteDeleteAsync();
 
-        // Delete expired references
-        db.FileReferences.RemoveRange(expiredReferences);
-        await db.SaveChangesAsync();
+        logger.LogInformation("Deleted {count} expired file references", deletedReferencesCount);
 
-        // Check remaining references for each file
-        foreach (var fileId in fileIds)
+        // Find files that now have no remaining references (bulk operation)
+        var filesToDelete = await db.Files
+            .Where(f => affectedFileIds.Contains(f.Id))
+            .Where(f => !db.FileReferences.Any(r => r.FileId == f.Id))
+            .Select(f => f.Id)
+            .ToListAsync();
+
+        if (filesToDelete.Any())
         {
-            var remainingReferences = await db.FileReferences
-                .Where(r => r.FileId == fileId)
-                .CountAsync();
+            logger.LogInformation("Deleting {count} files that have no remaining references", filesToDelete.Count);
 
-            filesAndReferenceCount[fileId] = remainingReferences;
+            // Get files for deletion
+            var files = await db.Files
+                .Where(f => filesToDelete.Contains(f.Id))
+                .ToListAsync();
 
-            // If no references remain, delete the file
-            if (remainingReferences == 0)
-            {
-                var file = await db.Files.FirstOrDefaultAsync(f => f.Id == fileId);
-                if (file == null) continue;
-                logger.LogInformation("Deleting file {fileId} as all references have expired", fileId);
-                await fileService.DeleteFileAsync(file);
+            // Delete files and their data in parallel
+            var deleteTasks = files.Select(f => fileService.DeleteFileAsync(f));
+            await Task.WhenAll(deleteTasks);
         }
-            else
+
+        // Purge cache for files that still have references
+        var filesWithRemainingRefs = affectedFileIds.Except(filesToDelete).ToList();
+        if (filesWithRemainingRefs.Any())
         {
-                // Just purge the cache
-                await fileService._PurgeCacheAsync(fileId);
-            }
+            var cachePurgeTasks = filesWithRemainingRefs.Select(fileService._PurgeCacheAsync);
+            await Task.WhenAll(cachePurgeTasks);
         }
 
         logger.LogInformation("Completed file reference expiration job");

DysonNetwork.Drive/Storage/FileReferenceService.cs

@@ -90,13 +90,45 @@ public class FileReferenceService(AppDatabase db, FileService fileService, ICach
         return references;
     }
 
-    public async Task<Dictionary<string, List<CloudFileReference>>> GetReferencesAsync(IEnumerable<string> fileId)
+    public async Task<Dictionary<string, List<CloudFileReference>>> GetReferencesAsync(IEnumerable<string> fileIds)
     {
-        var references = await db.FileReferences
-            .Where(r => fileId.Contains(r.FileId))
+        var fileIdList = fileIds.ToList();
+        var result = new Dictionary<string, List<CloudFileReference>>();
+
+        // Check cache for each file ID
+        var uncachedFileIds = new List<string>();
+        foreach (var fileId in fileIdList)
+        {
+            var cacheKey = $"{CacheKeyPrefix}list:{fileId}";
+            var cachedReferences = await cache.GetAsync<List<CloudFileReference>>(cacheKey);
+            if (cachedReferences is not null)
+            {
+                result[fileId] = cachedReferences;
+            }
+            else
+            {
+                uncachedFileIds.Add(fileId);
+            }
+        }
+
+        // Fetch uncached references from database
+        if (uncachedFileIds.Any())
+        {
+            var dbReferences = await db.FileReferences
+                .Where(r => uncachedFileIds.Contains(r.FileId))
                 .GroupBy(r => r.FileId)
                 .ToDictionaryAsync(r => r.Key, r => r.ToList());
-        return references;
+
+            // Cache the results
+            foreach (var kvp in dbReferences)
+            {
+                var cacheKey = $"{CacheKeyPrefix}list:{kvp.Key}";
+                await cache.SetAsync(cacheKey, kvp.Value, CacheDuration);
+                result[kvp.Key] = kvp.Value;
+            }
+        }
+
+        return result;
     }
 
     /// <summary>
@@ -150,9 +182,19 @@ public class FileReferenceService(AppDatabase db, FileService fileService, ICach
     /// <returns>A list of file references with the specified usage</returns>
     public async Task<List<CloudFileReference>> GetUsageReferencesAsync(string usage)
     {
-        return await db.FileReferences
+        var cacheKey = $"{CacheKeyPrefix}usage:{usage}";
+
+        var cachedReferences = await cache.GetAsync<List<CloudFileReference>>(cacheKey);
+        if (cachedReferences is not null)
+            return cachedReferences;
+
+        var references = await db.FileReferences
             .Where(r => r.Usage == usage)
             .ToListAsync();
+
+        await cache.SetAsync(cacheKey, references, CacheDuration);
+
+        return references;
     }
 
     /// <summary>
@@ -209,8 +251,9 @@ public class FileReferenceService(AppDatabase db, FileService fileService, ICach
     
     public async Task<int> DeleteResourceReferencesBatchAsync(IEnumerable<string> resourceIds, string? usage = null)
     {
+        var resourceIdList = resourceIds.ToList();
         var references = await db.FileReferences
-            .Where(r => resourceIds.Contains(r.ResourceId))
+            .Where(r => resourceIdList.Contains(r.ResourceId))
             .If(usage != null, q => q.Where(q => q.Usage == usage))
             .ToListAsync();
 
@@ -222,8 +265,9 @@ public class FileReferenceService(AppDatabase db, FileService fileService, ICach
         db.FileReferences.RemoveRange(references);
         var deletedCount = await db.SaveChangesAsync();
 
-        // Purge caches
+        // Purge caches for files and resources
         var tasks = fileIds.Select(fileService._PurgeCacheAsync).ToList();
+        tasks.AddRange(resourceIdList.Select(PurgeCacheForResourceAsync));
         await Task.WhenAll(tasks);
 
         return deletedCount;

DysonNetwork.Drive/Storage/FileService.cs

@@ -99,30 +99,75 @@ public class FileService(
     )
     {
         var accountId = Guid.Parse(account.Id);
+        var pool = await ValidateAndGetPoolAsync(filePool);
+        var bundle = await ValidateAndGetBundleAsync(fileBundleId, accountId);
+        var finalExpiredAt = CalculateFinalExpiration(expiredAt, pool, bundle);
 
+        var (managedTempPath, fileSize, finalContentType) = await PrepareFileAsync(fileId, filePath, fileName, contentType);
+
+        var file = CreateFileObject(fileId, fileName, finalContentType, fileSize, finalExpiredAt, bundle, accountId);
+
+        if (!pool.PolicyConfig.NoMetadata)
+        {
+            await ExtractMetadataAsync(file, managedTempPath);
+        }
+
+        var (processingPath, isTempFile) = await ProcessEncryptionAsync(fileId, managedTempPath, encryptPassword, pool, file);
+
+        file.Hash = await HashFileAsync(processingPath);
+
+        await SaveFileToDatabaseAsync(file);
+
+        await PublishFileUploadedEventAsync(file, pool, processingPath, isTempFile);
+
+        return file;
+    }
+
+    private async Task<FilePool> ValidateAndGetPoolAsync(string filePool)
+    {
         var pool = await GetPoolAsync(Guid.Parse(filePool));
         if (pool is null) throw new InvalidOperationException("Pool not found");
+        return pool;
+    }
 
+    private async Task<SnFileBundle?> ValidateAndGetBundleAsync(string? fileBundleId, Guid accountId)
+    {
+        if (fileBundleId is null) return null;
+
+        var bundle = await GetBundleAsync(Guid.Parse(fileBundleId), accountId);
+        if (bundle is null) throw new InvalidOperationException("Bundle not found");
+
+        return bundle;
+    }
+
+    private Instant? CalculateFinalExpiration(Instant? expiredAt, FilePool pool, SnFileBundle? bundle)
+    {
+        var finalExpiredAt = expiredAt;
+
+        // Apply pool expiration policy
         if (pool.StorageConfig.Expiration is not null && expiredAt.HasValue)
         {
             var expectedExpiration = SystemClock.Instance.GetCurrentInstant() - expiredAt.Value;
             var effectiveExpiration = pool.StorageConfig.Expiration < expectedExpiration
                 ? pool.StorageConfig.Expiration
                 : expectedExpiration;
-            expiredAt = SystemClock.Instance.GetCurrentInstant() + effectiveExpiration;
-        }
-
-        var bundle = fileBundleId is not null
-            ? await GetBundleAsync(Guid.Parse(fileBundleId), accountId)
-            : null;
-        if (fileBundleId is not null && bundle is null)
-        {
-            throw new InvalidOperationException("Bundle not found");
+            finalExpiredAt = SystemClock.Instance.GetCurrentInstant() + effectiveExpiration;
         }
 
+        // Bundle expiration takes precedence
         if (bundle?.ExpiredAt != null)
-            expiredAt = bundle.ExpiredAt.Value;
+            finalExpiredAt = bundle.ExpiredAt.Value;
 
+        return finalExpiredAt;
+    }
+
+    private async Task<(string tempPath, long fileSize, string contentType)> PrepareFileAsync(
+        string fileId,
+        string filePath,
+        string fileName,
+        string? contentType
+    )
+    {
         var managedTempPath = Path.Combine(Path.GetTempPath(), fileId);
         File.Copy(filePath, managedTempPath, true);
 
@@ -131,27 +176,42 @@ public class FileService(
         var finalContentType = contentType ??
                                (!fileName.Contains('.') ? "application/octet-stream" : MimeTypes.GetMimeType(fileName));
 
-        var file = new SnCloudFile
+        return (managedTempPath, fileSize, finalContentType);
+    }
+
+    private SnCloudFile CreateFileObject(
+        string fileId,
+        string fileName,
+        string contentType,
+        long fileSize,
+        Instant? expiredAt,
+        SnFileBundle? bundle,
+        Guid accountId
+    )
+    {
+        return new SnCloudFile
         {
             Id = fileId,
             Name = fileName,
-            MimeType = finalContentType,
+            MimeType = contentType,
             Size = fileSize,
             ExpiredAt = expiredAt,
             BundleId = bundle?.Id,
-            AccountId = Guid.Parse(account.Id),
+            AccountId = accountId,
         };
-
-        if (!pool.PolicyConfig.NoMetadata)
-        {
-            await ExtractMetadataAsync(file, managedTempPath);
     }
 
-        string processingPath = managedTempPath;
-        bool isTempFile = true;
-
-        if (!string.IsNullOrWhiteSpace(encryptPassword))
+    private async Task<(string processingPath, bool isTempFile)> ProcessEncryptionAsync(
+        string fileId,
+        string managedTempPath,
+        string? encryptPassword,
+        FilePool pool,
+        SnCloudFile file
+    )
     {
+        if (string.IsNullOrWhiteSpace(encryptPassword))
+            return (managedTempPath, true);
+
         if (!pool.PolicyConfig.AllowEncryption)
             throw new InvalidOperationException("Encryption is not allowed in this pool");
 
@@ -160,20 +220,22 @@ public class FileService(
 
         File.Delete(managedTempPath);
 
-            processingPath = encryptedPath;
-
         file.IsEncrypted = true;
         file.MimeType = "application/octet-stream";
-            file.Size = new FileInfo(processingPath).Length;
+        file.Size = new FileInfo(encryptedPath).Length;
+
+        return (encryptedPath, true);
     }
 
-        file.Hash = await HashFileAsync(processingPath);
-
+    private async Task SaveFileToDatabaseAsync(SnCloudFile file)
+    {
         db.Files.Add(file);
         await db.SaveChangesAsync();
-
         file.StorageId ??= file.Id;
+    }
 
+    private async Task PublishFileUploadedEventAsync(SnCloudFile file, FilePool pool, string processingPath, bool isTempFile)
+    {
         var js = nats.CreateJetStreamContext();
         await js.PublishAsync(
             FileUploadedEvent.Type,
@@ -186,8 +248,6 @@ public class FileService(
                 isTempFile)
             ).ToByteArray()
         );
-
-        return file;
     }
 
     private async Task ExtractMetadataAsync(SnCloudFile file, string filePath)

DysonNetwork.Drive/Storage/FileUploadController.cs

@@ -4,6 +4,7 @@ using DysonNetwork.Drive.Billing;
 using DysonNetwork.Drive.Storage.Model;
 using DysonNetwork.Shared.Auth;
 using DysonNetwork.Shared.Http;
+using DysonNetwork.Shared.Models;
 using DysonNetwork.Shared.Proto;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -32,46 +33,82 @@ public class FileUploadController(
     [HttpPost("create")]
     public async Task<IActionResult> CreateUploadTask([FromBody] CreateUploadTaskRequest request)
     {
-        if (HttpContext.Items["CurrentUser"] is not Account currentUser)
-        {
+        var currentUser = HttpContext.Items["CurrentUser"] as Account;
+        if (currentUser is null)
             return new ObjectResult(ApiError.Unauthorized()) { StatusCode = 401 };
-        }
 
-        if (!currentUser.IsSuperuser)
-        {
-            var allowed = await permission.HasPermissionAsync(new HasPermissionRequest
-            { Actor = $"user:{currentUser.Id}", Area = "global", Key = "files.create" });
-            if (!allowed.HasPermission)
-            {
-                return new ObjectResult(ApiError.Unauthorized(forbidden: true)) { StatusCode = 403 };
-            }
-        }
+        var permissionCheck = await ValidateUserPermissions(currentUser);
+        if (permissionCheck is not null) return permissionCheck;
 
         request.PoolId ??= Guid.Parse(configuration["Storage:PreferredRemote"]!);
 
         var pool = await fileService.GetPoolAsync(request.PoolId.Value);
         if (pool is null)
-        {
             return new ObjectResult(ApiError.NotFound("Pool")) { StatusCode = 404 };
+
+        var poolValidation = await ValidatePoolAccess(currentUser, pool, request);
+        if (poolValidation is not null) return poolValidation;
+
+        var policyValidation = ValidatePoolPolicy(pool.PolicyConfig, request);
+        if (policyValidation is not null) return policyValidation;
+
+        var quotaValidation = await ValidateQuota(currentUser, pool, request.FileSize);
+        if (quotaValidation is not null) return quotaValidation;
+
+        EnsureTempDirectoryExists();
+
+        // Check if a file with the same hash already exists
+        var existingFile = await db.Files.FirstOrDefaultAsync(f => f.Hash == request.Hash);
+        if (existingFile != null)
+        {
+            return Ok(new CreateUploadTaskResponse
+            {
+                FileExists = true,
+                File = existingFile
+            });
         }
 
-        if (pool.PolicyConfig.RequirePrivilege is > 0)
+        var (taskId, task) = await CreateUploadTaskInternal(request);
+        return Ok(new CreateUploadTaskResponse
         {
-            var privilege =
-                currentUser.PerkSubscription is null ? 0 :
+            FileExists = false,
+            TaskId = taskId,
+            ChunkSize = task.ChunkSize,
+            ChunksCount = task.ChunksCount
+        });
+    }
+
+    private async Task<IActionResult?> ValidateUserPermissions(Account currentUser)
+    {
+        if (currentUser.IsSuperuser) return null;
+
+        var allowed = await permission.HasPermissionAsync(new HasPermissionRequest
+        { Actor = $"user:{currentUser.Id}", Area = "global", Key = "files.create" });
+
+        return allowed.HasPermission ? null :
+            new ObjectResult(ApiError.Unauthorized(forbidden: true)) { StatusCode = 403 };
+    }
+
+    private async Task<IActionResult?> ValidatePoolAccess(Account currentUser, FilePool pool, CreateUploadTaskRequest request)
+    {
+        if (pool.PolicyConfig.RequirePrivilege <= 0) return null;
+
+        var privilege = currentUser.PerkSubscription is null ? 0 :
             PerkSubscriptionPrivilege.GetPrivilegeFromIdentifier(currentUser.PerkSubscription.Identifier);
+
         if (privilege < pool.PolicyConfig.RequirePrivilege)
         {
             return new ObjectResult(ApiError.Unauthorized(
                 $"You need Stellar Program tier {pool.PolicyConfig.RequirePrivilege} to use pool {pool.Name}, you are tier {privilege}",
                 forbidden: true))
-                {
-                    StatusCode = 403
-                };
-            }
+            { StatusCode = 403 };
         }
 
-        var policy = pool.PolicyConfig;
+        return null;
+    }
+
+    private IActionResult? ValidatePoolPolicy(PolicyConfig policy, CreateUploadTaskRequest request)
+    {
         if (!policy.AllowEncryption && !string.IsNullOrEmpty(request.EncryptPassword))
         {
             return new ObjectResult(ApiError.Unauthorized("File encryption is not allowed in this pool", true))
@@ -103,8 +140,7 @@ public class FileUploadController(
             if (!foundMatch)
             {
                 return new ObjectResult(
-                    ApiError.Unauthorized($"Content type {request.ContentType} is not allowed by the pool's policy",
-                        true))
+                    ApiError.Unauthorized($"Content type {request.ContentType} is not allowed by the pool's policy", true))
                 { StatusCode = 403 };
             }
         }
@@ -112,42 +148,41 @@ public class FileUploadController(
         if (policy.MaxFileSize is not null && request.FileSize > policy.MaxFileSize)
         {
             return new ObjectResult(ApiError.Unauthorized(
-                $"File size {request.FileSize} is larger than the pool's maximum file size {policy.MaxFileSize}",
-                true))
-            {
-                StatusCode = 403
-            };
-        }
-
-        var (ok, billableUnit, quota) = await quotaService.IsFileAcceptable(
-            Guid.Parse(currentUser.Id),
-            pool.BillingConfig.CostMultiplier ?? 1.0,
-            request.FileSize
-        );
-        if (!ok)
-        {
-            return new ObjectResult(
-                ApiError.Unauthorized($"File size {billableUnit} MiB is exceeded the user's quota {quota} MiB",
-                    true))
+                $"File size {request.FileSize} is larger than the pool's maximum file size {policy.MaxFileSize}", true))
             { StatusCode = 403 };
         }
 
+        return null;
+    }
+
+    private async Task<IActionResult?> ValidateQuota(Account currentUser, FilePool pool, long fileSize)
+    {
+        var (ok, billableUnit, quota) = await quotaService.IsFileAcceptable(
+            Guid.Parse(currentUser.Id),
+            pool.BillingConfig.CostMultiplier ?? 1.0,
+            fileSize
+        );
+
+        if (!ok)
+        {
+            return new ObjectResult(
+                ApiError.Unauthorized($"File size {billableUnit} MiB is exceeded the user's quota {quota} MiB", true))
+            { StatusCode = 403 };
+        }
+
+        return null;
+    }
+
+    private void EnsureTempDirectoryExists()
+    {
         if (!Directory.Exists(_tempPath))
         {
             Directory.CreateDirectory(_tempPath);
         }
-
-        // Check if a file with the same hash already exists
-        var existingFile = await db.Files.FirstOrDefaultAsync(f => f.Hash == request.Hash);
-        if (existingFile != null)
-        {
-            return Ok(new CreateUploadTaskResponse
-            {
-                FileExists = true,
-                File = existingFile
-            });
     }
 
+    private async Task<(string taskId, UploadTask task)> CreateUploadTaskInternal(CreateUploadTaskRequest request)
+    {
         var taskId = await Nanoid.GenerateAsync();
         var taskPath = Path.Combine(_tempPath, taskId);
         Directory.CreateDirectory(taskPath);
@@ -171,14 +206,7 @@ public class FileUploadController(
         };
 
         await System.IO.File.WriteAllTextAsync(Path.Combine(taskPath, "task.json"), JsonSerializer.Serialize(task));
-
-        return Ok(new CreateUploadTaskResponse
-        {
-            FileExists = false,
-            TaskId = taskId,
-            ChunkSize = chunkSize,
-            ChunksCount = chunksCount
-        });
+        return (taskId, task);
     }
 
     public class UploadChunkRequest
@@ -211,52 +239,28 @@ public class FileUploadController(
     {
         var taskPath = Path.Combine(_tempPath, taskId);
         if (!Directory.Exists(taskPath))
-        {
             return new ObjectResult(ApiError.NotFound("Upload task")) { StatusCode = 404 };
-        }
 
         var taskJsonPath = Path.Combine(taskPath, "task.json");
         if (!System.IO.File.Exists(taskJsonPath))
-        {
             return new ObjectResult(ApiError.NotFound("Upload task metadata")) { StatusCode = 404 };
-        }
 
         var task = JsonSerializer.Deserialize<UploadTask>(await System.IO.File.ReadAllTextAsync(taskJsonPath));
         if (task == null)
-        {
             return new ObjectResult(new ApiError { Code = "BAD_REQUEST", Message = "Invalid task metadata.", Status = 400 })
             { StatusCode = 400 };
-        }
+
+        var currentUser = HttpContext.Items["CurrentUser"] as Account;
+        if (currentUser is null)
+            return new ObjectResult(ApiError.Unauthorized()) { StatusCode = 401 };
 
         var mergedFilePath = Path.Combine(_tempPath, taskId + ".tmp");
-        await using (var mergedStream = new FileStream(mergedFilePath, FileMode.Create))
-        {
-            for (var i = 0; i < task.ChunksCount; i++)
-            {
-                var chunkPath = Path.Combine(taskPath, $"{i}.chunk");
-                if (!System.IO.File.Exists(chunkPath))
-                {
-                    // Clean up partially uploaded file
-                    mergedStream.Close();
-                    System.IO.File.Delete(mergedFilePath);
-                    Directory.Delete(taskPath, true);
-                    return new ObjectResult(new ApiError
-                    { Code = "CHUNK_MISSING", Message = $"Chunk {i} is missing.", Status = 400 })
-                    { StatusCode = 400 };
-                }
 
-                await using var chunkStream = new FileStream(chunkPath, FileMode.Open);
-                await chunkStream.CopyToAsync(mergedStream);
-            }
-        }
-
-        if (HttpContext.Items["CurrentUser"] is not Account currentUser)
+        try
         {
-            return new ObjectResult(ApiError.Unauthorized()) { StatusCode = 401 };
-        }
+            await MergeChunks(taskPath, mergedFilePath, task.ChunksCount);
 
             var fileId = await Nanoid.GenerateAsync();
-
             var cloudFile = await fileService.ProcessNewFileAsync(
                 currentUser,
                 fileId,
@@ -269,10 +273,57 @@ public class FileUploadController(
                 task.ExpiredAt
             );
 
-        // Clean up
-        Directory.Delete(taskPath, true);
-        System.IO.File.Delete(mergedFilePath);
-
             return Ok(cloudFile);
         }
+        catch (Exception)
+        {
+            // Log the error and clean up
+            // (Assuming you have a logger - you might want to inject ILogger)
+            await CleanupTempFiles(taskPath, mergedFilePath);
+            return new ObjectResult(new ApiError
+            {
+                Code = "UPLOAD_FAILED",
+                Message = "Failed to complete file upload.",
+                Status = 500
+            }) { StatusCode = 500 };
+        }
+        finally
+        {
+            // Always clean up temp files
+            await CleanupTempFiles(taskPath, mergedFilePath);
+        }
+    }
+
+    private async Task MergeChunks(string taskPath, string mergedFilePath, int chunksCount)
+    {
+        await using var mergedStream = new FileStream(mergedFilePath, FileMode.Create);
+
+        for (var i = 0; i < chunksCount; i++)
+        {
+            var chunkPath = Path.Combine(taskPath, $"{i}.chunk");
+            if (!System.IO.File.Exists(chunkPath))
+            {
+                throw new InvalidOperationException($"Chunk {i} is missing.");
+            }
+
+            await using var chunkStream = new FileStream(chunkPath, FileMode.Open);
+            await chunkStream.CopyToAsync(mergedStream);
+        }
+    }
+
+    private async Task CleanupTempFiles(string taskPath, string mergedFilePath)
+    {
+        try
+        {
+            if (Directory.Exists(taskPath))
+                Directory.Delete(taskPath, true);
+
+            if (System.IO.File.Exists(mergedFilePath))
+                System.IO.File.Delete(mergedFilePath);
+        }
+        catch
+        {
+            // Ignore cleanup errors to avoid masking the original exception
+        }
+    }
 }