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using MediaBrowser.Common.Logging;
using MediaBrowser.Common.Plugins;
using MediaBrowser.Common.Serialization;
using MediaBrowser.Model.DTO;
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
namespace MediaBrowser.UI.Controller
{
/// <summary>
/// This keeps ui plugin assemblies in sync with plugins installed on the server
/// </summary>
public class PluginUpdater
{
/// <summary>
/// Gets the list of currently installed UI plugins
/// </summary>
[ImportMany(typeof(BasePlugin))]
private IEnumerable<BasePlugin> CurrentPlugins { get; set; }
private CompositionContainer CompositionContainer { get; set; }
public async Task<PluginUpdateResult> UpdatePlugins()
{
// First load the plugins that are currently installed
ReloadComposableParts();
Logger.LogInfo("Downloading list of installed plugins");
PluginInfo[] allInstalledPlugins = await UIKernel.Instance.ApiClient.GetInstalledPluginsAsync().ConfigureAwait(false);
IEnumerable<PluginInfo> uiPlugins = allInstalledPlugins.Where(p => p.DownloadToUI);
PluginUpdateResult result = new PluginUpdateResult();
result.DeletedPlugins = DeleteUninstalledPlugins(uiPlugins);
await DownloadPluginAssemblies(uiPlugins, result).ConfigureAwait(false);
// If any new assemblies were downloaded we'll have to reload the CurrentPlugins list
if (result.NewlyInstalledPlugins.Any())
{
ReloadComposableParts();
}
result.UpdatedConfigurations = await DownloadPluginConfigurations(uiPlugins).ConfigureAwait(false);
CompositionContainer.Dispose();
return result;
}
/// <summary>
/// Downloads plugin assemblies from the server, if they need to be installed or updated.
/// </summary>
private async Task DownloadPluginAssemblies(IEnumerable<PluginInfo> uiPlugins, PluginUpdateResult result)
{
List<PluginInfo> newlyInstalledPlugins = new List<PluginInfo>();
List<PluginInfo> updatedPlugins = new List<PluginInfo>();
// Loop through the list of plugins that are on the server
foreach (PluginInfo pluginInfo in uiPlugins)
{
// See if it is already installed in the UI
BasePlugin installedPlugin = CurrentPlugins.FirstOrDefault(p => p.AssemblyFileName.Equals(pluginInfo.AssemblyFileName, StringComparison.OrdinalIgnoreCase));
// Download the plugin if it is not present, or if the current version is out of date
bool downloadPlugin = installedPlugin == null;
if (installedPlugin != null)
{
Version serverVersion = Version.Parse(pluginInfo.Version);
downloadPlugin = serverVersion > installedPlugin.Version;
}
if (downloadPlugin)
{
await DownloadPlugin(pluginInfo).ConfigureAwait(false);
if (installedPlugin == null)
{
newlyInstalledPlugins.Add(pluginInfo);
}
else
{
updatedPlugins.Add(pluginInfo);
}
}
}
result.NewlyInstalledPlugins = newlyInstalledPlugins;
result.UpdatedPlugins = updatedPlugins;
}
/// <summary>
/// Downloads plugin configurations from the server.
/// </summary>
private async Task<List<PluginInfo>> DownloadPluginConfigurations(IEnumerable<PluginInfo> uiPlugins)
{
List<PluginInfo> updatedPlugins = new List<PluginInfo>();
// Loop through the list of plugins that are on the server
foreach (PluginInfo pluginInfo in uiPlugins)
{
// See if it is already installed in the UI
BasePlugin installedPlugin = CurrentPlugins.First(p => p.AssemblyFileName.Equals(pluginInfo.AssemblyFileName, StringComparison.OrdinalIgnoreCase));
if (installedPlugin.ConfigurationDateLastModified < pluginInfo.ConfigurationDateLastModified)
{
await DownloadPluginConfiguration(installedPlugin, pluginInfo).ConfigureAwait(false);
updatedPlugins.Add(pluginInfo);
}
}
return updatedPlugins;
}
/// <summary>
/// Downloads a plugin assembly from the server
/// </summary>
private async Task DownloadPlugin(PluginInfo plugin)
{
Logger.LogInfo("Downloading {0} Plugin", plugin.Name);
string path = Path.Combine(UIKernel.Instance.ApplicationPaths.PluginsPath, plugin.AssemblyFileName);
// First download to a MemoryStream. This way if the download is cut off, we won't be left with a partial file
using (MemoryStream memoryStream = new MemoryStream())
{
Stream assemblyStream = await UIKernel.Instance.ApiClient.GetPluginAssemblyAsync(plugin).ConfigureAwait(false);
await assemblyStream.CopyToAsync(memoryStream).ConfigureAwait(false);
memoryStream.Position = 0;
using (FileStream fileStream = new FileStream(path, FileMode.Create))
{
await memoryStream.CopyToAsync(fileStream).ConfigureAwait(false);
}
}
}
/// <summary>
/// Downloads the latest configuration for a plugin
/// </summary>
private async Task DownloadPluginConfiguration(BasePlugin plugin, PluginInfo pluginInfo)
{
Logger.LogInfo("Downloading {0} Configuration", plugin.Name);
object config = await UIKernel.Instance.ApiClient.GetPluginConfigurationAsync(pluginInfo, plugin.ConfigurationType).ConfigureAwait(false);
XmlSerializer.SerializeToFile(config, plugin.ConfigurationFilePath);
File.SetLastWriteTimeUtc(plugin.ConfigurationFilePath, pluginInfo.ConfigurationDateLastModified);
}
/// <summary>
/// Deletes any plugins that have been uninstalled from the server
/// </summary>
private IEnumerable<string> DeleteUninstalledPlugins(IEnumerable<PluginInfo> uiPlugins)
{
var deletedPlugins = new List<string>();
foreach (BasePlugin plugin in CurrentPlugins)
{
PluginInfo latest = uiPlugins.FirstOrDefault(p => p.AssemblyFileName.Equals(plugin.AssemblyFileName, StringComparison.OrdinalIgnoreCase));
if (latest == null)
{
DeletePlugin(plugin);
deletedPlugins.Add(plugin.Name);
}
}
return deletedPlugins;
}
/// <summary>
/// Deletes an installed ui plugin.
/// Leaves config and data behind in the event it is later re-installed
/// </summary>
private void DeletePlugin(BasePlugin plugin)
{
Logger.LogInfo("Deleting {0} Plugin", plugin.Name);
string path = plugin.AssemblyFilePath;
if (File.Exists(path))
{
File.Delete(path);
}
}
/// <summary>
/// Re-uses MEF within the kernel to discover installed plugins
/// </summary>
private void ReloadComposableParts()
{
if (CompositionContainer != null)
{
CompositionContainer.Dispose();
}
CompositionContainer = UIKernel.Instance.GetCompositionContainer();
CompositionContainer.ComposeParts(this);
CompositionContainer.Catalog.Dispose();
foreach (BasePlugin plugin in CurrentPlugins)
{
plugin.Initialize(UIKernel.Instance, false);
}
}
}
public class PluginUpdateResult
{
public IEnumerable<string> DeletedPlugins { get; set; }
public IEnumerable<PluginInfo> NewlyInstalledPlugins { get; set; }
public IEnumerable<PluginInfo> UpdatedPlugins { get; set; }
public IEnumerable<PluginInfo> UpdatedConfigurations { get; set; }
}
}
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