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AssemblyResolver.cs
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AssemblyResolver.cs
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
namespace Microsoft.VisualStudio.TestPlatform.Common.Utilities
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using Microsoft.VisualStudio.TestPlatform.ObjectModel;
using Microsoft.VisualStudio.TestPlatform.PlatformAbstractions;
using Microsoft.VisualStudio.TestPlatform.PlatformAbstractions.Interfaces;
internal class AssemblyResolver : IDisposable
{
/// <summary>
/// The directories to look for assemblies to resolve.
/// </summary>
private HashSet<string> searchDirectories;
/// <summary>
/// Dictionary of Assemblies discovered to date. Must be locked as it may
/// be accessed in a multi-threaded context.
/// </summary>
private Dictionary<string, Assembly> resolvedAssemblies;
/// <summary>
/// Specifies whether the resolver is disposed or not
/// </summary>
private bool isDisposed;
/// <summary>
/// Assembly resolver for platform
/// </summary>
private IAssemblyResolver platformAssemblyResolver;
private IAssemblyLoadContext platformAssemblyLoadContext;
private static readonly string[] SupportedFileExtensions = new string[] { ".dll", ".exe" };
/// <summary>
/// Initializes a new instance of the <see cref="AssemblyResolver"/> class.
/// </summary>
/// <param name="directories"> The search directories. </param>
[System.Security.SecurityCritical]
public AssemblyResolver(IEnumerable<string> directories)
{
this.resolvedAssemblies = new Dictionary<string, Assembly>();
if (directories == null || !directories.Any())
{
this.searchDirectories = new HashSet<string>();
}
else
{
this.searchDirectories = new HashSet<string>(directories);
}
this.platformAssemblyResolver = new PlatformAssemblyResolver();
this.platformAssemblyLoadContext = new PlatformAssemblyLoadContext();
this.platformAssemblyResolver.AssemblyResolve += this.OnResolve;
}
/// <summary>
/// Set the directories from which assemblies should be searched
/// </summary>
/// <param name="directories"> The search directories. </param>
[System.Security.SecurityCritical]
internal void AddSearchDirectories(IEnumerable<string> directories)
{
foreach (var directory in directories)
{
this.searchDirectories.Add(directory);
}
}
/// <summary>
/// Assembly Resolve event handler for App Domain - called when CLR loader cannot resolve assembly.
/// </summary>
/// <returns>
/// The <see cref="Assembly"/>.
/// </returns>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods", MessageId = "System.Reflection.Assembly.LoadFrom")]
private Assembly OnResolve(object sender, AssemblyResolveEventArgs args)
{
if (string.IsNullOrEmpty(args?.Name))
{
Debug.Assert(false, "AssemblyResolver.OnResolve: args.Name is null or empty.");
return null;
}
if (this.searchDirectories == null || this.searchDirectories.Count == 0)
{
return null;
}
EqtTrace.Info("AssemblyResolver: {0}: Resolving assembly.", args.Name);
// args.Name is like: "Microsoft.VisualStudio.TestTools.Common, Version=[VersionMajor].0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
lock (this.resolvedAssemblies)
{
Assembly assembly;
if (this.resolvedAssemblies.TryGetValue(args.Name, out assembly))
{
EqtTrace.Info("AssemblyResolver: {0}: Resolved from cache.", args.Name);
return (assembly);
}
AssemblyName requestedName = null;
try
{
// Can throw ArgumentException, FileLoadException if arg is empty/wrong format, etc. Should not return null.
requestedName = new AssemblyName(args.Name);
}
catch (Exception ex)
{
if (EqtTrace.IsInfoEnabled)
{
EqtTrace.Info("AssemblyResolver: {0}: Failed to create assemblyName. Reason:{1} ", args.Name, ex);
}
return null;
}
Debug.Assert(requestedName != null && !string.IsNullOrEmpty(requestedName.Name), "AssemblyResolver.OnResolve: requested is null or name is empty!");
foreach (var dir in this.searchDirectories)
{
if (string.IsNullOrEmpty(dir))
{
continue;
}
foreach (var extension in SupportedFileExtensions)
{
var assemblyPath = Path.Combine(dir, requestedName.Name + extension);
try
{
if (!File.Exists(assemblyPath))
{
continue;
}
AssemblyName foundName = this.platformAssemblyLoadContext.GetAssemblyNameFromPath(assemblyPath);
if (!this.RequestedAssemblyNameMatchesFound(requestedName, foundName))
{
continue; // File exists but version/public key is wrong. Try next extension.
}
assembly = this.platformAssemblyLoadContext.LoadAssemblyFromPath(assemblyPath);
this.resolvedAssemblies[args.Name] = assembly;
EqtTrace.Info("AssemblyResolver: {0}: Resolved assembly. ", args.Name);
return assembly;
}
catch (FileLoadException ex)
{
EqtTrace.Info("AssemblyResolver: {0}: Failed to load assembly. Reason:{1} ", args.Name, ex);
// Rethrow FileLoadException, because this exception means that the assembly
// was found, but could not be loaded. This will allow us to report a more
// specific error message to the user for things like access denied.
throw;
}
catch (Exception ex)
{
// For all other exceptions, try the next extension.
EqtTrace.Info("AssemblyResolver: {0}: Failed to load assembly. Reason:{1} ", args.Name, ex);
}
}
}
}
return null;
}
/// <summary>
/// Verifies that found assembly name matches requested to avoid security issues.
/// Looks only at PublicKeyToken and Version, empty matches anything.
/// VSWhidbey 415774.
/// </summary>
/// <returns>
/// The <see cref="bool"/>.
/// </returns>
private bool RequestedAssemblyNameMatchesFound(AssemblyName requestedName, AssemblyName foundName)
{
Debug.Assert(requestedName != null);
Debug.Assert(foundName != null);
var requestedPublicKey = requestedName.GetPublicKeyToken();
if (requestedPublicKey != null)
{
var foundPublicKey = foundName.GetPublicKeyToken();
if (foundPublicKey == null)
{
return false;
}
for (var index = 0; index < requestedPublicKey.Length; ++index)
{
if (requestedPublicKey[index] != foundPublicKey[index])
{
return false;
}
}
}
if (requestedName.Version != null)
{
return requestedName.Version.Equals(foundName.Version);
}
return true;
}
~AssemblyResolver()
{
this.Dispose(false);
}
public void Dispose()
{
this.Dispose(true);
// Use SupressFinalize in case a subclass
// of this type implements a finalizer.
GC.SuppressFinalize(this);
}
[System.Security.SecurityCritical]
protected virtual void Dispose(bool disposing)
{
if (!this.isDisposed)
{
if (disposing)
{
this.platformAssemblyResolver.AssemblyResolve -= this.OnResolve;
this.platformAssemblyResolver.Dispose();
}
this.isDisposed = true;
}
}
}
}