Fixes and a lot of changes

Application/Contracts/Application/IFileData.cs

@@ -0,0 +1,13 @@
+namespace Musify.Application.Contracts.Application
+{
+    public interface IFileData
+    {
+        Stream FileStream { get; }
+
+        string FileName { get; }
+
+        string FileType { get; }
+
+        string ContentType { get; }
+    }
+}

Application/Contracts/Infrastructure/IAudioTranscoderService.cs

@@ -0,0 +1,9 @@
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public interface IAudioTranscoderService
+    {
+        Task<int> TranscodeToDashAsync(Stream audioStream, string destinationPath, CancellationToken cancellationToken);
+
+        Task<bool> IsValidAudioFileAsync(string filePath, CancellationToken cancellationToken);
+    }
+}

Application/Contracts/Infrastructure/IDatabase.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore;
+using Musify.Domain.Entities;
+
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public interface IDatabase
+    {
+        DbSet<User> Users { get; }
+
+        DbSet<PlayList> PlayLists { get; }
+
+        DbSet<Track> Tracks { get; }
+
+        DbSet<UserHasTrack> UserHasTracks { get; }
+
+        DbSet<PlayListHasTrack> PlayListHasTracks { get; }
+
+        DbSet<Upload> Uploads { get; }
+
+        DbSet<UploadIntent> UploadIntents { get; }
+
+        Task<IDatabaseTransaction> BeginTransactionAsync(System.Data.IsolationLevel isolationLevel, CancellationToken cancellationToken);
+
+        Task<int> SaveChangesAsync(CancellationToken cancellationToken);
+    }
+}

Application/Contracts/Infrastructure/IDatabaseTransaction.cs

@@ -0,0 +1,7 @@
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public interface IDatabaseTransaction : IAsyncDisposable
+    {
+        Task CommitAsync(CancellationToken cancellationToken = default);
+    }
+}

Application/Contracts/Infrastructure/IEventBus.cs

@@ -0,0 +1,7 @@
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public interface IEventBus
+    {
+        Task PublishAsync<T>(T message, CancellationToken cancellationToken) where T : class;
+    }
+}

Application/Contracts/Infrastructure/IPictureService.cs

@@ -0,0 +1,7 @@
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public interface IPictureService
+    {
+        Task<Stream> ResizePictureAsWebpAsync(Stream pictureStream, int width, int height, CancellationToken cancellationToken);
+    }
+}

Application/Contracts/Infrastructure/IStorageService.cs

@@ -0,0 +1,30 @@
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public interface IStorageService
+    {
+        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 UploadFileAsync(string filePath, string bucket, string key, CancellationToken cancellationToken);
+
+        Task UploadFileAsync(Stream sourceStream, string contentType, string bucket, string key, CancellationToken cancellationToken);
+
+        Task TransferFilesAsync(string sourceDirectory, string bucket, string route, CancellationToken cancellationToken);
+
+        Task RemoveFileAsync(string bucket, string key, CancellationToken cancellationToken);
+
+        Task CopyFileAsync(string sourceBucket, string sourceKey, string destinationBucket, string destinationKey,
+            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);
+    }
+}

Application/Contracts/Infrastructure/ObjectMetadata.cs

@@ -0,0 +1,4 @@
+namespace Musify.Application.Contracts.Infrastructure
+{
+    public record ObjectMetadata(string ContentType, long ContentLength);
+}