PreventOverwrite

Application/Contracts/IStorageService.cs

@@ -4,12 +4,11 @@ namespace Musify.Application.Contracts
     {
         Task<Stream> GetFileAsync(string bucket, string key, CancellationToken cancellationToken);
 
-        // Returns null if the object does not exist
         Task<ObjectMetaData?> HeadObjectAsync(string bucket, string key, CancellationToken cancellationToken);
 
         Task<string> GetUrlAsync(string bucket, string key, TimeSpan ExpirationTime, CancellationToken cancellationToken);
 
-        Task<string> GetUploadUrlAsync(string bucket, string key, string contentType, TimeSpan expirationTime, CancellationToken cancellationToken);
+        Task<string> GetUploadUrlAsync(string bucket, string key, string contentType, TimeSpan expirationTime, CancellationToken cancellationToken, bool preventOverwrite = true);
 
         Task UploadFileAsync(string filePath, string bucket, string key, CancellationToken cancellationToken);
 
@@ -23,8 +22,7 @@ namespace Musify.Application.Contracts
             CancellationToken cancellationToken);
 
         Task RemoveFolderAsync(string bucket, string folderKey, CancellationToken cancellationToken);
-
+        
-        // Returns (key, lastModifiedUtc) for all objects under the given prefix
         IAsyncEnumerable<(string Key, DateTime LastModifiedUtc)> ListObjectsAsync(string bucket, string prefix, CancellationToken cancellationToken);
     }
 }

Infrastructure/Services/StorageService.cs

@@ -55,7 +55,8 @@ namespace Musify.Infrastructure.Services
             string key,
             string contentType,
             TimeSpan expirationTime,
-            CancellationToken cancellationToken)
+            CancellationToken cancellationToken,
+            bool preventOverwrite = true)
         {
             var request = new GetPreSignedUrlRequest
             {
@@ -67,6 +68,9 @@ namespace Musify.Infrastructure.Services
                 ContentType = contentType
             };
 
+            if (preventOverwrite)
+                request.Headers["If-None-Match"] = "*";
+
             logger.LogDebug("Generating pre-signed upload URL for {Bucket}/{Key}", bucket, key);
             return await amazonS3.GetPreSignedURLAsync(request);
         }