Add Koreader API endpoints

API/Services/KoreaderService.cs

@@ -0,0 +1,82 @@
+using System.Threading.Tasks;
+using API.Data;
+using API.DTOs.Koreader;
+using API.DTOs.Progress;
+using API.Helpers;
+using API.Helpers.Builders;
+using Microsoft.Extensions.Logging;
+
+namespace API.Services;
+
+#nullable enable
+
+public interface IKoreaderService
+{
+    Task SaveProgress(KoreaderBookDto koreaderBookDto, int userId);
+    Task<KoreaderBookDto> GetProgress(string bookHash, int userId);
+}
+
+public class KoreaderService : IKoreaderService
+{
+    private readonly IReaderService _readerService;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly ILogger<KoreaderService> _logger;
+
+    public KoreaderService(IReaderService readerService, IUnitOfWork unitOfWork, ILogger<KoreaderService> logger)
+    {
+        _readerService = readerService;
+        _unitOfWork = unitOfWork;
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Given a Koreader hash, locate the underlying file and generate/update a progress event.
+    /// </summary>
+    /// <param name="koreaderBookDto"></param>
+    /// <param name="userId"></param>
+    public async Task SaveProgress(KoreaderBookDto koreaderBookDto, int userId)
+    {
+        _logger.LogDebug("Saving Koreader progress for {UserId}: {KoreaderProgress}", userId, koreaderBookDto.Progress);
+        var file = await _unitOfWork.MangaFileRepository.GetByKoreaderHash(koreaderBookDto.Document);
+        if (file == null) return;
+
+        var userProgressDto = await _unitOfWork.AppUserProgressRepository.GetUserProgressDtoAsync(file.ChapterId, userId);
+        if (userProgressDto == null)
+        {
+            // TODO: Handle this case
+            userProgressDto = new ProgressDto()
+            {
+                ChapterId = file.ChapterId,
+            };
+        }
+        // Update the bookScrollId if possible
+        KoreaderHelper.UpdateProgressDto(userProgressDto, koreaderBookDto.Progress);
+
+        await _readerService.SaveReadingProgress(userProgressDto, userId);
+    }
+
+    /// <summary>
+    /// Returns a Koreader Dto representing current book and the progress within
+    /// </summary>
+    /// <param name="bookHash"></param>
+    /// <param name="userId"></param>
+    /// <returns></returns>
+    public async Task<KoreaderBookDto> GetProgress(string bookHash, int userId)
+    {
+        var settingsDto = await _unitOfWork.SettingsRepository.GetSettingsDtoAsync();
+        var builder = new KoreaderBookDtoBuilder(bookHash);
+
+        var file = await _unitOfWork.MangaFileRepository.GetByKoreaderHash(bookHash);
+
+        // TODO: How do we handle when file isn't found by hash?
+        if (file == null) return builder.Build();
+
+        var progressDto = await _unitOfWork.AppUserProgressRepository.GetUserProgressDtoAsync(file.ChapterId, userId);
+        var koreaderProgress = KoreaderHelper.GetKoreaderPosition(progressDto);
+
+        return builder.WithProgress(koreaderProgress)
+            .WithPercentage(progressDto?.PageNum, file.Pages)
+            .WithDeviceId(settingsDto.InstallId, userId) // TODO: Should we generate a hash for UserId + InstallId so that this DeviceId is unique to the user on the server?
+            .Build();
+    }
+}