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using System;
using System.IO.Compression;
using System.Threading;
using System.Threading.Tasks;
using System.Xml.Linq;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.IO;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Providers.Books.ComicInfo;
/// <summary>
/// Handles metadata for comics which is saved as an XML document inside the comic itself.
/// </summary>
public class InternalComicInfoProvider : IComicProvider
{
private readonly IFileSystem _fileSystem;
private readonly ILogger<InternalComicInfoProvider> _logger;
/// <summary>
/// Initializes a new instance of the <see cref="InternalComicInfoProvider"/> class.
/// </summary>
/// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
/// <param name="logger">Instance of the <see cref="ILogger{InternalComicInfoProvider}"/> interface.</param>
public InternalComicInfoProvider(IFileSystem fileSystem, ILogger<InternalComicInfoProvider> logger)
{
_logger = logger;
_fileSystem = fileSystem;
}
/// <inheritdoc />
public async ValueTask<MetadataResult<Book>> ReadMetadata(ItemInfo info, IDirectoryService directoryService, CancellationToken cancellationToken)
{
var comicInfoXml = await LoadXml(info, cancellationToken).ConfigureAwait(false);
if (comicInfoXml is null)
{
_logger.LogInformation("Could not load ComicInfo metadata for {Path} from XML file. No internal XML in comic archive.", info.Path);
return new MetadataResult<Book> { HasMetadata = false };
}
var book = ComicInfoReader.ReadComicBookMetadata(comicInfoXml);
if (book is null)
{
return new MetadataResult<Book> { HasMetadata = false };
}
var metadataResult = new MetadataResult<Book> { Item = book, HasMetadata = true };
ComicInfoReader.ReadPeopleMetadata(comicInfoXml, metadataResult);
ComicInfoReader.ReadCultureInfoInto(comicInfoXml, "ComicInfo/LanguageISO", cultureInfo => metadataResult.ResultLanguage = cultureInfo.ThreeLetterISOLanguageName);
return metadataResult;
}
/// <inheritdoc />
public bool HasItemChanged(BaseItem item)
{
var file = GetComicBookFile(item.Path);
if (file is null)
{
return false;
}
return file.Exists && _fileSystem.GetLastWriteTimeUtc(file) > item.DateLastSaved;
}
private async Task<XDocument?> LoadXml(ItemInfo info, CancellationToken cancellationToken)
{
var path = GetComicBookFile(info.Path)?.FullName;
if (path is null)
{
return null;
}
try
{
// open the comic archive and try to get the ComicInfo.xml entry
using var comicBookFile = await ZipFile.OpenReadAsync(path, cancellationToken).ConfigureAwait(false);
var container = comicBookFile.GetEntry(ComicInfoReader.ComicRackMetaFile);
if (container is null)
{
return null;
}
using var containerStream = await container.OpenAsync(cancellationToken).ConfigureAwait(false);
var comicInfoXml = XDocument.LoadAsync(containerStream, LoadOptions.None, cancellationToken);
return await comicInfoXml.ConfigureAwait(false);
}
catch (Exception e)
{
_logger.LogError(e, "could not load internal XML from {Path}", path);
return null;
}
}
private FileSystemMetadata? GetComicBookFile(string path)
{
var fileInfo = _fileSystem.GetFileSystemInfo(path);
if (fileInfo.IsDirectory)
{
return null;
}
// only parse files that are known to have internal metadata
if (!string.Equals(fileInfo.Extension, ".cbz", StringComparison.OrdinalIgnoreCase))
{
return null;
}
return fileInfo;
}
}
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