Optimised UploadFileAsync()

Implemented and tested DeleteFileAsync()

LiteCharms.Features/Extensions/Hash.cs

@@ -2,6 +2,12 @@
 
 public static class Hash
 {
-    public static Func<string?, string?> GenerateSha256HashString = (input) => 
+    public static Func<string?, string?> StringToSha256Hash = (input) => 
         Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(input!)));
+
+    public static Func<Stream, string?> StreamToSha256Hash = (stream) =>
+        Convert.ToHexString(SHA256.HashData(stream));
+
+    public static Func<byte[], string?> BytesToSha256Hash = (bytes) =>
+        Convert.ToHexString(SHA256.HashData(bytes));
 }

LiteCharms.Features/S3/Abstractions/IS3Service.cs

@@ -3,4 +3,5 @@
 public interface IS3Service
 {
     Task<Result<string>> UploadFileAsync(string fileName, Stream fileStream, string contentType, CancellationToken cancellationToken = default);
+    Task<Result> DeleteFileAsync(string fileKey, CancellationToken cancellationToken = default);
 }

LiteCharms.Features/S3/Abstractions/S3ServiceBase.cs

@@ -1,4 +1,6 @@
-namespace LiteCharms.Features.S3.Abstractions;
+using static LiteCharms.Features.Extensions.Hash;
+
+namespace LiteCharms.Features.S3.Abstractions;
 
 public abstract class S3ServiceBase(IAmazonS3 amazonS3)
 {
@@ -17,17 +19,31 @@ public abstract class S3ServiceBase(IAmazonS3 amazonS3)
             if (string.IsNullOrWhiteSpace(CdnBaseUrl))
                 return Result.Fail<string>("CDN base URL is not configured.");
 
-            var fileKey = $"{Guid.NewGuid():N}{Path.GetExtension(fileName)}";
+            using var stream = new MemoryStream();
+
+            await fileStream.CopyToAsync(stream, cancellationToken);
+            await fileStream.DisposeAsync();
+
+            stream.Seek(0, SeekOrigin.Begin);
+
+            var fileHash = StreamToSha256Hash(stream);
+
+            if(string.IsNullOrWhiteSpace(fileHash))
+                return Result.Fail<string>("Failed to compute file hash.");
+
+            var fileKey = $"{fileHash.ToLower()}{Path.GetExtension(fileName)}";
 
             var putRequest = new PutObjectRequest
             {
                 BucketName = BucketName,
                 Key = fileKey,
-                InputStream = fileStream,
+                InputStream = stream,
                 ContentType = contentType,
                 UseChunkEncoding = false
             };
 
+            stream.Seek(0, SeekOrigin.Begin);
+
             var response = await Client.PutObjectAsync(putRequest, cancellationToken);
 
             return response.HttpStatusCode != System.Net.HttpStatusCode.OK
@@ -39,4 +55,29 @@ public abstract class S3ServiceBase(IAmazonS3 amazonS3)
             return Result.Fail<string>(new Error($"Error uploading {fileName} to S3: {ex.Message}").CausedBy(ex));
         }
     }
+
+    public virtual async Task<Result> DeleteFileAsync(string fileKey, CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            if (string.IsNullOrWhiteSpace(BucketName))
+                return Result.Fail("Bucket name is not configured.");
+
+            var deleteRequest = new DeleteObjectRequest
+            {
+                BucketName = BucketName,
+                Key = fileKey
+            };
+
+            var response = await Client.DeleteObjectAsync(deleteRequest, cancellationToken);
+
+            return response.HttpStatusCode != System.Net.HttpStatusCode.NoContent
+                ? Result.Fail($"Failed to delete {fileKey} from S3.")
+                : Result.Ok();
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail(new Error($"Error deleting {fileKey} from S3: {ex.Message}").CausedBy(ex));
+        }
+    }
 }

LiteCharms.Features/Shop/Leads/LeadService.cs

@@ -28,7 +28,7 @@ public class LeadService(IDbContextFactory<ShopDbContext> contextFactory)
                 FeedItemId = request.FeedItemId,
                 Status = LeadStatus.New,
                 TargetId = request.TargetId,
-                AttributionHash = GenerateSha256HashString.Invoke($"{request.ClickId}{request.AppClickId}{request.WebClickId}")
+                AttributionHash = StringToSha256Hash.Invoke($"{request.ClickId}{request.AppClickId}{request.WebClickId}")
             });
 
             return await context.SaveChangesAsync(cancellationToken) > 0