update metadata editor

MediaBrowser.MediaEncoding/Encoder/FontConfigLoader.cs

@@ -0,0 +1,179 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using CommonIO;
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.Net;
+using MediaBrowser.Model.IO;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.Net;
+
+namespace MediaBrowser.MediaEncoding.Encoder
+{
+    public class FontConfigLoader
+    {
+        private readonly IHttpClient _httpClient;
+        private readonly IApplicationPaths _appPaths;
+        private readonly ILogger _logger;
+        private readonly IZipClient _zipClient;
+        private readonly IFileSystem _fileSystem;
+
+        private readonly string[] _fontUrls =
+        {
+            "https://github.com/MediaBrowser/MediaBrowser.Resources/raw/master/ffmpeg/ARIALUNI.7z"
+        };
+
+        public FontConfigLoader(IHttpClient httpClient, IApplicationPaths appPaths, ILogger logger, IZipClient zipClient, IFileSystem fileSystem)
+        {
+            _httpClient = httpClient;
+            _appPaths = appPaths;
+            _logger = logger;
+            _zipClient = zipClient;
+            _fileSystem = fileSystem;
+        }
+
+        /// <summary>
+        /// Extracts the fonts.
+        /// </summary>
+        /// <param name="targetPath">The target path.</param>
+        /// <returns>Task.</returns>
+        public async Task DownloadFonts(string targetPath)
+        {
+            try
+            {
+                var fontsDirectory = Path.Combine(targetPath, "fonts");
+
+                _fileSystem.CreateDirectory(fontsDirectory);
+
+                const string fontFilename = "ARIALUNI.TTF";
+
+                var fontFile = Path.Combine(fontsDirectory, fontFilename);
+
+                if (_fileSystem.FileExists(fontFile))
+                {
+                    await WriteFontConfigFile(fontsDirectory).ConfigureAwait(false);
+                }
+                else
+                {
+                    // Kick this off, but no need to wait on it
+                    Task.Run(async () =>
+                    {
+                        await DownloadFontFile(fontsDirectory, fontFilename, new Progress<double>()).ConfigureAwait(false);
+
+                        await WriteFontConfigFile(fontsDirectory).ConfigureAwait(false);
+                    });
+                }
+            }
+            catch (HttpException ex)
+            {
+                // Don't let the server crash because of this
+                _logger.ErrorException("Error downloading ffmpeg font files", ex);
+            }
+            catch (Exception ex)
+            {
+                // Don't let the server crash because of this
+                _logger.ErrorException("Error writing ffmpeg font files", ex);
+            }
+        }
+
+        /// <summary>
+        /// Downloads the font file.
+        /// </summary>
+        /// <param name="fontsDirectory">The fonts directory.</param>
+        /// <param name="fontFilename">The font filename.</param>
+        /// <returns>Task.</returns>
+        private async Task DownloadFontFile(string fontsDirectory, string fontFilename, IProgress<double> progress)
+        {
+            var existingFile = Directory
+                .EnumerateFiles(_appPaths.ProgramDataPath, fontFilename, SearchOption.AllDirectories)
+                .FirstOrDefault();
+
+            if (existingFile != null)
+            {
+                try
+                {
+                    _fileSystem.CopyFile(existingFile, Path.Combine(fontsDirectory, fontFilename), true);
+                    return;
+                }
+                catch (IOException ex)
+                {
+                    // Log this, but don't let it fail the operation
+                    _logger.ErrorException("Error copying file", ex);
+                }
+            }
+
+            string tempFile = null;
+
+            foreach (var url in _fontUrls)
+            {
+                progress.Report(0);
+
+                try
+                {
+                    tempFile = await _httpClient.GetTempFile(new HttpRequestOptions
+                    {
+                        Url = url,
+                        Progress = progress
+
+                    }).ConfigureAwait(false);
+
+                    break;
+                }
+                catch (Exception ex)
+                {
+                    // The core can function without the font file, so handle this
+                    _logger.ErrorException("Failed to download ffmpeg font file from {0}", ex, url);
+                }
+            }
+
+            if (string.IsNullOrEmpty(tempFile))
+            {
+                return;
+            }
+
+            Extract7zArchive(tempFile, fontsDirectory);
+
+            try
+            {
+                _fileSystem.DeleteFile(tempFile);
+            }
+            catch (IOException ex)
+            {
+                // Log this, but don't let it fail the operation
+                _logger.ErrorException("Error deleting temp file {0}", ex, tempFile);
+            }
+        }
+        private void Extract7zArchive(string archivePath, string targetPath)
+        {
+            _logger.Info("Extracting {0} to {1}", archivePath, targetPath);
+
+            _zipClient.ExtractAllFrom7z(archivePath, targetPath, true);
+        }
+
+        /// <summary>
+        /// Writes the font config file.
+        /// </summary>
+        /// <param name="fontsDirectory">The fonts directory.</param>
+        /// <returns>Task.</returns>
+        private async Task WriteFontConfigFile(string fontsDirectory)
+        {
+            const string fontConfigFilename = "fonts.conf";
+            var fontConfigFile = Path.Combine(fontsDirectory, fontConfigFilename);
+
+            if (!_fileSystem.FileExists(fontConfigFile))
+            {
+                var contents = string.Format("<?xml version=\"1.0\"?><fontconfig><dir>{0}</dir><alias><family>Arial</family><prefer>Arial Unicode MS</prefer></alias></fontconfig>", fontsDirectory);
+
+                var bytes = Encoding.UTF8.GetBytes(contents);
+
+                using (var fileStream = _fileSystem.GetFileStream(fontConfigFile, FileMode.Create, FileAccess.Write,
+                                                    FileShare.Read, true))
+                {
+                    await fileStream.WriteAsync(bytes, 0, bytes.Length);
+                }
+            }
+        }
+    }
+}