76 lines
2.8 KiB
C#
76 lines
2.8 KiB
C#
using System;
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using System.IO;
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using System.Threading.Tasks;
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using FileManager;
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using DataLayer;
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using Dinah.Core.ErrorHandling;
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namespace FileLiberator
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{
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/// <summary>
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/// Download DRM book and decrypt audiobook files.
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///
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/// Processes:
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/// Download: download aax file: the DRM encrypted audiobook
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/// Decrypt: remove DRM encryption from audiobook. Store final book
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/// Backup: perform all steps (downloaded, decrypt) still needed to get final book
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/// </summary>
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public class DownloadBook : DownloadableBase
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{
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public override async Task<bool> ValidateAsync(LibraryBook libraryBook)
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=> !await AudibleFileStorage.Audio.ExistsAsync(libraryBook.Book.AudibleProductId)
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&& !await AudibleFileStorage.AAX.ExistsAsync(libraryBook.Book.AudibleProductId);
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public override async Task<StatusHandler> ProcessItemAsync(LibraryBook libraryBook)
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{
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var tempAaxFilename = FileUtility.GetValidFilename(
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AudibleFileStorage.DownloadsInProgress,
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libraryBook.Book.Title,
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"aax",
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libraryBook.Book.AudibleProductId);
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// if getting from full title:
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// '?' is allowed
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// colons are inconsistent but not problematic to just leave them
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// - 1 colon: sometimes full title is used. sometimes only the part before the colon is used
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// - multple colons: only the part before the final colon is used
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// e.g. Alien: Out of the Shadows: An Audible Original Drama => Alien: Out of the Shadows
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// in cases where title includes '&', just use everything before the '&' and ignore the rest
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//// var adhTitle = product.Title.Split('&')[0]
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// new/api method
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tempAaxFilename = await performApiDownloadAsync(libraryBook, tempAaxFilename);
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// move
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var aaxFilename = FileUtility.GetValidFilename(
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AudibleFileStorage.DownloadsFinal,
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libraryBook.Book.Title,
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"aax",
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libraryBook.Book.AudibleProductId);
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File.Move(tempAaxFilename, aaxFilename);
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var statusHandler = new StatusHandler();
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var isDownloaded = await AudibleFileStorage.AAX.ExistsAsync(libraryBook.Book.AudibleProductId);
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if (isDownloaded)
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Invoke_StatusUpdate($"Downloaded: {aaxFilename}");
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else
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statusHandler.AddError("Downloaded AAX file cannot be found");
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return statusHandler;
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}
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private async Task<string> performApiDownloadAsync(LibraryBook libraryBook, string tempAaxFilename)
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{
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var api = await AudibleApi.EzApiCreator.GetApiAsync(AudibleApiStorage.IdentityTokensFile);
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var progress = new Progress<Dinah.Core.Net.Http.DownloadProgress>();
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progress.ProgressChanged += (_, e) => Invoke_DownloadProgressChanged(this, e);
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Invoke_DownloadBegin(tempAaxFilename);
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var actualFilePath = await api.DownloadAaxWorkaroundAsync(libraryBook.Book.AudibleProductId, tempAaxFilename, progress);
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Invoke_DownloadCompleted(this, $"Completed: {actualFilePath}");
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return actualFilePath;
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}
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}
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}
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