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using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Providers.Books.OpenPackagingFormat
{
/// <summary>
/// Provides the primary image for EPUB items that have embedded covers.
/// </summary>
public class EpubImageProvider : IDynamicImageProvider
{
private readonly ILogger<EpubImageProvider> _logger;
/// <summary>
/// Initializes a new instance of the <see cref="EpubImageProvider"/> class.
/// </summary>
/// <param name="logger">Instance of the <see cref="ILogger{EpubImageProvider}"/> interface.</param>
public EpubImageProvider(ILogger<EpubImageProvider> logger)
{
_logger = logger;
}
/// <inheritdoc />
public string Name => "EPUB Metadata";
/// <inheritdoc />
public bool Supports(BaseItem item)
{
return item is Book;
}
/// <inheritdoc />
public IEnumerable<ImageType> GetSupportedImages(BaseItem item)
{
yield return ImageType.Primary;
}
/// <inheritdoc />
public Task<DynamicImageResponse> GetImage(BaseItem item, ImageType type, CancellationToken cancellationToken)
{
if (string.Equals(Path.GetExtension(item.Path), ".epub", StringComparison.OrdinalIgnoreCase))
{
return GetFromZip(item, cancellationToken);
}
return Task.FromResult(new DynamicImageResponse { HasImage = false });
}
private async Task<DynamicImageResponse> LoadCover(ZipArchive epub, XmlDocument opf, string opfRootDirectory, CancellationToken cancellationToken)
{
var utilities = new OpfReader<EpubImageProvider>(opf, _logger);
var coverReference = utilities.ReadCoverPath(opfRootDirectory);
if (coverReference == null)
{
return new DynamicImageResponse { HasImage = false };
}
var cover = coverReference.Value;
var coverFile = epub.GetEntry(cover.Path);
if (coverFile == null)
{
return new DynamicImageResponse { HasImage = false };
}
var memoryStream = new MemoryStream();
var coverStream = await coverFile.OpenAsync(cancellationToken).ConfigureAwait(false);
await using (coverStream.ConfigureAwait(false))
{
await coverStream.CopyToAsync(memoryStream, cancellationToken).ConfigureAwait(false);
}
memoryStream.Position = 0;
var response = new DynamicImageResponse { HasImage = true, Stream = memoryStream };
response.SetFormatFromMimeType(cover.MimeType);
return response;
}
private async Task<DynamicImageResponse> GetFromZip(BaseItem item, CancellationToken cancellationToken)
{
using var epub = await ZipFile.OpenReadAsync(item.Path, cancellationToken).ConfigureAwait(false);
var opfFilePath = EpubUtils.ReadContentFilePath(epub);
if (opfFilePath == null)
{
return new DynamicImageResponse { HasImage = false };
}
var opfRootDirectory = Path.GetDirectoryName(opfFilePath);
if (opfRootDirectory == null)
{
return new DynamicImageResponse { HasImage = false };
}
var opfFile = epub.GetEntry(opfFilePath);
if (opfFile == null)
{
return new DynamicImageResponse { HasImage = false };
}
using var opfStream = await opfFile.OpenAsync(cancellationToken).ConfigureAwait(false);
var opfDocument = new XmlDocument();
opfDocument.Load(opfStream);
return await LoadCover(epub, opfDocument, opfRootDirectory, cancellationToken).ConfigureAwait(false);
}
}
}
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