2019-01-06 21:50:43 +01:00
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using System;
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2016-10-29 07:40:15 +02:00
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using System.IO;
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using MediaBrowser.Model.Serialization;
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2017-02-20 21:50:58 +01:00
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namespace Emby.Server.Implementations.AppBase
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2016-10-29 07:40:15 +02:00
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{
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/// <summary>
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2019-10-25 12:47:20 +02:00
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/// Class ConfigurationHelper.
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2016-10-29 07:40:15 +02:00
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/// </summary>
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public static class ConfigurationHelper
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{
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/// <summary>
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/// Reads an xml configuration file from the file system
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2019-10-25 12:47:20 +02:00
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/// It will immediately re-serialize and save if new serialization data is available due to property changes.
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2016-10-29 07:40:15 +02:00
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="path">The path.</param>
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/// <param name="xmlSerializer">The XML serializer.</param>
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/// <returns>System.Object.</returns>
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2019-02-06 20:38:42 +01:00
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public static object GetXmlConfiguration(Type type, string path, IXmlSerializer xmlSerializer)
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{
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object configuration;
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2020-08-07 17:38:01 +02:00
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byte[]? buffer = null;
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2016-10-29 07:40:15 +02:00
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// Use try/catch to avoid the extra file system lookup using File.Exists
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try
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{
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2019-01-26 23:09:07 +01:00
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buffer = File.ReadAllBytes(path);
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2016-10-29 07:40:15 +02:00
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configuration = xmlSerializer.DeserializeFromBytes(type, buffer);
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}
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catch (Exception)
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{
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2021-05-28 14:33:54 +02:00
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// Note: CreateInstance returns null for Nullable<T>, e.g. CreateInstance(typeof(int?)) returns null.
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configuration = Activator.CreateInstance(type)!;
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2016-10-29 07:40:15 +02:00
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}
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2020-08-07 17:38:01 +02:00
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using var stream = new MemoryStream(buffer?.Length ?? 0);
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2020-04-14 21:11:21 +02:00
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xmlSerializer.SerializeToStream(configuration, stream);
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2016-10-29 07:40:15 +02:00
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2020-04-14 21:11:21 +02:00
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// Take the object we just got and serialize it back to bytes
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2021-10-03 19:52:38 +02:00
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Span<byte> newBytes = stream.GetBuffer().AsSpan(0, (int)stream.Length);
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2016-10-29 07:40:15 +02:00
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2020-04-14 21:11:21 +02:00
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// If the file didn't exist before, or if something has changed, re-save
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2022-12-05 15:00:20 +01:00
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if (buffer is null || !newBytes.SequenceEqual(buffer))
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2020-04-14 21:11:21 +02:00
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{
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2020-11-14 02:04:06 +01:00
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var directory = Path.GetDirectoryName(path) ?? throw new ArgumentException($"Provided path ({path}) is not valid.", nameof(path));
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2016-10-29 07:40:15 +02:00
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2020-11-13 17:41:18 +01:00
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Directory.CreateDirectory(directory);
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2021-10-03 19:52:38 +02:00
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2020-04-14 21:11:21 +02:00
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// Save it after load in case we got new items
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2021-03-07 14:43:28 +01:00
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using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None))
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{
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fs.Write(newBytes);
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2020-08-07 17:38:01 +02:00
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}
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2016-10-29 07:40:15 +02:00
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}
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2020-04-14 21:11:21 +02:00
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return configuration;
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2016-10-29 07:40:15 +02:00
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}
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}
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}
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