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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Core.ExtensibilityServices
{
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using WixToolset.Data;
using WixToolset.Extensibility;
using WixToolset.Extensibility.Services;
internal class ExtensionManager : IExtensionManager
{
private List<IExtensionFactory> extensionFactories = new List<IExtensionFactory>();
private Dictionary<Type, List<object>> loadedExtensionsByType = new Dictionary<Type, List<object>>();
public ExtensionManager(IWixToolsetCoreServiceProvider serviceProvider)
{
this.ServiceProvider = serviceProvider;
}
private IWixToolsetCoreServiceProvider ServiceProvider { get; }
public void Add(Assembly extensionAssembly)
{
var types = extensionAssembly.GetTypes().Where(t => !t.IsAbstract && !t.IsInterface && typeof(IExtensionFactory).IsAssignableFrom(t));
var factories = types.Select(this.CreateExtensionFactory).ToList();
if (!factories.Any())
{
var path = Path.GetFullPath(new Uri(extensionAssembly.CodeBase).LocalPath);
throw new WixException(ErrorMessages.InvalidExtension(path, "The extension does not implement IExtensionFactory. All extensions must have at least one implementation of IExtensionFactory."));
}
this.extensionFactories.AddRange(factories);
}
public void Load(string extensionPath)
{
var checkPath = extensionPath;
var checkedPaths = new List<string> { checkPath };
try
{
if (!TryLoadFromPath(checkPath, out var assembly) && !Path.IsPathRooted(extensionPath))
{
if (TryParseExtensionReference(extensionPath, out var extensionId, out var extensionVersion))
{
foreach (var cachePath in this.CacheLocations())
{
var extensionFolder = Path.Combine(cachePath, extensionId);
var versionFolder = extensionVersion;
if (String.IsNullOrEmpty(versionFolder) && !TryFindLatestVersionInFolder(extensionFolder, out versionFolder))
{
checkedPaths.Add(extensionFolder);
continue;
}
checkPath = Path.Combine(extensionFolder, versionFolder, "tools", extensionId + ".dll");
checkedPaths.Add(checkPath);
if (TryLoadFromPath(checkPath, out assembly))
{
break;
}
}
}
}
if (assembly == null)
{
throw new WixException(ErrorMessages.CouldNotFindExtensionInPaths(extensionPath, checkedPaths));
}
this.Add(assembly);
}
catch (ReflectionTypeLoadException rtle)
{
throw new WixException(ErrorMessages.InvalidExtension(checkPath, String.Join(Environment.NewLine, rtle.LoaderExceptions.Select(le => le.ToString()))));
}
catch (WixException)
{
throw;
}
catch (Exception e)
{
throw new WixException(ErrorMessages.InvalidExtension(checkPath, e.Message), e);
}
}
public IEnumerable<T> GetServices<T>() where T : class
{
if (!this.loadedExtensionsByType.TryGetValue(typeof(T), out var extensions))
{
extensions = new List<object>();
foreach (var factory in this.extensionFactories)
{
if (factory.TryCreateExtension(typeof(T), out var obj) && obj is T extension)
{
extensions.Add(extension);
}
}
this.loadedExtensionsByType.Add(typeof(T), extensions);
}
return extensions.Cast<T>().ToList();
}
private IExtensionFactory CreateExtensionFactory(Type type)
{
var constructor = type.GetConstructor(new[] { typeof(IWixToolsetCoreServiceProvider) });
if (constructor != null)
{
return (IExtensionFactory)constructor.Invoke(new[] { this.ServiceProvider });
}
return (IExtensionFactory)Activator.CreateInstance(type);
}
private IEnumerable<string> CacheLocations()
{
var path = Path.Combine(Environment.CurrentDirectory, ".wix", "extensions");
if (Directory.Exists(path))
{
yield return path;
}
path = Environment.GetEnvironmentVariable("WIX_EXTENSIONS") ?? Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
path = Path.Combine(path, ".wix", "extensions");
if (Directory.Exists(path))
{
yield return path;
}
if (Environment.Is64BitOperatingSystem)
{
path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonProgramFiles), @"WixToolset\extensions\");
if (Directory.Exists(path))
{
yield return path;
}
}
path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonProgramFilesX86), @"WixToolset\extensions\");
if (Directory.Exists(path))
{
yield return path;
}
path = Path.Combine(Path.GetDirectoryName(new Uri(Assembly.GetCallingAssembly().CodeBase).LocalPath), @"extensions\");
if (Directory.Exists(path))
{
yield return path;
}
}
private static bool TryParseExtensionReference(string extensionReference, out string extensionId, out string extensionVersion)
{
extensionId = extensionReference ?? String.Empty;
extensionVersion = String.Empty;
var index = extensionId.LastIndexOf('/');
if (index > 0)
{
extensionVersion = extensionReference.Substring(index + 1);
extensionId = extensionReference.Substring(0, index);
if (!NuGet.Versioning.NuGetVersion.TryParse(extensionVersion, out _))
{
return false;
}
if (String.IsNullOrEmpty(extensionId))
{
return false;
}
}
return true;
}
private static bool TryFindLatestVersionInFolder(string basePath, out string foundVersionFolder)
{
foundVersionFolder = null;
try
{
NuGet.Versioning.NuGetVersion version = null;
foreach (var versionPath in Directory.GetDirectories(basePath))
{
var versionFolder = Path.GetFileName(versionPath);
if (NuGet.Versioning.NuGetVersion.TryParse(versionFolder, out var checkVersion) &&
(version == null || version < checkVersion))
{
foundVersionFolder = versionFolder;
version = checkVersion;
}
}
}
catch (IOException)
{
}
return !String.IsNullOrEmpty(foundVersionFolder);
}
private static bool TryLoadFromPath(string extensionPath, out Assembly assembly)
{
try
{
if (File.Exists(extensionPath))
{
assembly = Assembly.LoadFrom(extensionPath);
return true;
}
}
catch (IOException e) when (e is FileLoadException || e is FileNotFoundException)
{
}
assembly = null;
return false;
}
}
}
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