66 lines
2.4 KiB
C#
66 lines
2.4 KiB
C#
#nullable enable
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using System;
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using System.IO;
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using System.Linq;
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using MediaBrowser.Model.Serialization;
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namespace Emby.Server.Implementations.AppBase
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{
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/// <summary>
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/// Class ConfigurationHelper.
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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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/// It will immediately re-serialize and save if new serialization data is available due to property changes.
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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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public static object GetXmlConfiguration(Type type, string path, IXmlSerializer xmlSerializer)
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{
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object configuration;
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byte[]? buffer = null;
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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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buffer = File.ReadAllBytes(path);
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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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configuration = Activator.CreateInstance(type) ?? throw new ArgumentException($"Provided path ({type}) is not valid.", nameof(type));
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}
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using var stream = new MemoryStream(buffer?.Length ?? 0);
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xmlSerializer.SerializeToStream(configuration, stream);
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// Take the object we just got and serialize it back to bytes
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byte[] newBytes = stream.GetBuffer();
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int newBytesLen = (int)stream.Length;
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// If the file didn't exist before, or if something has changed, re-save
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if (buffer == null || !newBytes.AsSpan(0, newBytesLen).SequenceEqual(buffer))
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{
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var directory = Path.GetDirectoryName(path) ?? throw new ArgumentException($"Provided path ({path}) is not valid.", nameof(path));
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Directory.CreateDirectory(directory);
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// Save it after load in case we got new items
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// use FileShare.None as this bypasses dotnet bug dotnet/runtime#42790 .
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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, 0, newBytesLen);
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}
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}
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return configuration;
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}
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}
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}
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