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#nullable disable
#pragma warning disable SA1649 // File name should match first type name
using System;
using System.IO;
using System.Runtime.InteropServices;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Model.Plugins;
using MediaBrowser.Model.Serialization;
namespace MediaBrowser.Common.Plugins
{
/// <summary>
/// Provides a common base class for all plugins.
/// </summary>
/// <typeparam name="TConfigurationType">The type of the T configuration type.</typeparam>
public abstract class BasePlugin<TConfigurationType> : BasePlugin, IHasPluginConfiguration
where TConfigurationType : BasePluginConfiguration
{
/// <summary>
/// The configuration sync lock.
/// </summary>
private readonly object _configurationSyncLock = new object();
/// <summary>
/// The configuration save lock.
/// </summary>
private readonly object _configurationSaveLock = new object();
/// <summary>
/// The configuration.
/// </summary>
private TConfigurationType _configuration;
/// <summary>
/// Initializes a new instance of the <see cref="BasePlugin{TConfigurationType}" /> class.
/// </summary>
/// <param name="applicationPaths">The application paths.</param>
/// <param name="xmlSerializer">The XML serializer.</param>
protected BasePlugin(IApplicationPaths applicationPaths, IXmlSerializer xmlSerializer)
{
ApplicationPaths = applicationPaths;
XmlSerializer = xmlSerializer;
var assembly = GetType().Assembly;
var assemblyName = assembly.GetName();
var assemblyFilePath = assembly.Location;
var dataFolderPath = Path.Combine(ApplicationPaths.PluginsPath, Path.GetFileNameWithoutExtension(assemblyFilePath));
if (Version is not null && !Directory.Exists(dataFolderPath))
{
// Try again with the version number appended to the folder name.
dataFolderPath += "_" + Version;
}
SetAttributes(assemblyFilePath, dataFolderPath, assemblyName.Version);
var idAttributes = assembly.GetCustomAttributes(typeof(GuidAttribute), true);
if (idAttributes.Length > 0)
{
var attribute = (GuidAttribute)idAttributes[0];
var assemblyId = new Guid(attribute.Value);
SetId(assemblyId);
}
}
/// <summary>
/// Gets the application paths.
/// </summary>
/// <value>The application paths.</value>
protected IApplicationPaths ApplicationPaths { get; private set; }
/// <summary>
/// Gets the XML serializer.
/// </summary>
/// <value>The XML serializer.</value>
protected IXmlSerializer XmlSerializer { get; private set; }
/// <summary>
/// Gets the type of configuration this plugin uses.
/// </summary>
/// <value>The type of the configuration.</value>
public Type ConfigurationType => typeof(TConfigurationType);
/// <summary>
/// Gets or sets the event handler that is triggered when this configuration changes.
/// </summary>
public EventHandler<BasePluginConfiguration> ConfigurationChanged { get; set; }
/// <summary>
/// Gets the name the assembly file.
/// </summary>
/// <value>The name of the assembly file.</value>
protected string AssemblyFileName => Path.GetFileName(AssemblyFilePath);
/// <summary>
/// Gets or sets the plugin configuration.
/// </summary>
/// <value>The configuration.</value>
public TConfigurationType Configuration
{
get
{
// Lazy load
if (_configuration is null)
{
lock (_configurationSyncLock)
{
_configuration ??= LoadConfiguration();
}
}
return _configuration;
}
protected set => _configuration = value;
}
/// <summary>
/// Gets the name of the configuration file. Subclasses should override.
/// </summary>
/// <value>The name of the configuration file.</value>
public virtual string ConfigurationFileName => Path.ChangeExtension(AssemblyFileName, ".xml");
/// <summary>
/// Gets the full path to the configuration file.
/// </summary>
/// <value>The configuration file path.</value>
public string ConfigurationFilePath => Path.Combine(ApplicationPaths.PluginConfigurationsPath, ConfigurationFileName);
/// <summary>
/// Gets the plugin configuration.
/// </summary>
/// <value>The configuration.</value>
BasePluginConfiguration IHasPluginConfiguration.Configuration => Configuration;
/// <summary>
/// Saves the current configuration to the file system.
/// </summary>
/// <param name="config">Configuration to save.</param>
public virtual void SaveConfiguration(TConfigurationType config)
{
lock (_configurationSaveLock)
{
var folder = Path.GetDirectoryName(ConfigurationFilePath);
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
XmlSerializer.SerializeToFile(config, ConfigurationFilePath);
}
}
/// <summary>
/// Saves the current configuration to the file system.
/// </summary>
public virtual void SaveConfiguration()
{
SaveConfiguration(Configuration);
}
/// <inheritdoc />
public virtual void UpdateConfiguration(BasePluginConfiguration configuration)
{
ArgumentNullException.ThrowIfNull(configuration);
Configuration = (TConfigurationType)configuration;
SaveConfiguration(Configuration);
ConfigurationChanged?.Invoke(this, configuration);
}
/// <inheritdoc />
public override PluginInfo GetPluginInfo()
{
var info = base.GetPluginInfo();
info.ConfigurationFileName = ConfigurationFileName;
return info;
}
private TConfigurationType LoadConfiguration()
{
var path = ConfigurationFilePath;
try
{
return (TConfigurationType)XmlSerializer.DeserializeFromFile(typeof(TConfigurationType), path);
}
catch
{
var config = Activator.CreateInstance<TConfigurationType>();
SaveConfiguration(config);
return config;
}
}
}
}
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