1 files changed, 94 insertions, 0 deletions
diff --git a/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfProvider.cs b/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfProvider.cs
new file mode 100644
index 000000000..6e678802c
--- /dev/null
+++ b/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfProvider.cs
@@ -0,0 +1,94 @@
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Xml;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.IO;
+using Microsoft.Extensions.Logging;
+
+namespace MediaBrowser.Providers.Books.OpenPackagingFormat
+{
+    /// <summary>
+    /// Provides metadata for book items that have an OPF file in the same directory. Supports the standard
+    /// content.opf filename, bespoke metadata.opf name from Calibre libraries, and OPF files that have the
+    /// same name as their respective books for directories with several books.
+    /// </summary>
+    public class OpfProvider : ILocalMetadataProvider<Book>, IHasItemChangeMonitor
+    {
+        private const string StandardOpfFile = "content.opf";
+        private const string CalibreOpfFile = "metadata.opf";
+
+        private readonly IFileSystem _fileSystem;
+
+        private readonly ILogger<OpfProvider> _logger;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="OpfProvider"/> class.
+        /// </summary>
+        /// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
+        /// <param name="logger">Instance of the <see cref="ILogger{OpfProvider}"/> interface.</param>
+        public OpfProvider(IFileSystem fileSystem, ILogger<OpfProvider> logger)
+        {
+            _fileSystem = fileSystem;
+            _logger = logger;
+        }
+
+        /// <inheritdoc />
+        public string Name => "Open Packaging Format";
+
+        /// <inheritdoc />
+        public bool HasChanged(BaseItem item, IDirectoryService directoryService)
+        {
+            var file = GetXmlFile(item.Path);
+
+            return file.Exists && _fileSystem.GetLastWriteTimeUtc(file) > item.DateLastSaved;
+        }
+
+        /// <inheritdoc />
+        public Task<MetadataResult<Book>> GetMetadata(ItemInfo info, IDirectoryService directoryService, CancellationToken cancellationToken)
+        {
+            var path = GetXmlFile(info.Path).FullName;
+
+            try
+            {
+                return Task.FromResult(ReadOpfData(path, cancellationToken));
+            }
+            catch (FileNotFoundException)
+            {
+                return Task.FromResult(new MetadataResult<Book> { HasMetadata = false });
+            }
+        }
+
+        private FileSystemMetadata GetXmlFile(string path)
+        {
+            var fileInfo = _fileSystem.GetFileSystemInfo(path);
+            var directoryInfo = fileInfo.IsDirectory ? fileInfo : _fileSystem.GetDirectoryInfo(Path.GetDirectoryName(path)!);
+
+            // check for OPF with matching name first since it's the most specific filename
+            var specificFile = Path.Combine(directoryInfo.FullName, Path.GetFileNameWithoutExtension(path) + ".opf");
+            var file = _fileSystem.GetFileInfo(specificFile);
+
+            if (file.Exists)
+            {
+                return file;
+            }
+
+            file = _fileSystem.GetFileInfo(Path.Combine(directoryInfo.FullName, StandardOpfFile));
+
+            // check metadata.opf last since it's really only used by Calibre
+            return file.Exists ? file : _fileSystem.GetFileInfo(Path.Combine(directoryInfo.FullName, CalibreOpfFile));
+        }
+
+        private MetadataResult<Book> ReadOpfData(string file, CancellationToken cancellationToken)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            var doc = new XmlDocument();
+            doc.Load(file);
+
+            var utilities = new OpfReader<OpfProvider>(doc, _logger);
+            return utilities.ReadOpfData(cancellationToken);
+        }
+    }
+}