internal static bool IsNuGetAssembly(AssemblyReference assemblyReference)
{
var assemblyName = assemblyReference.GetAssemblyName();
var isNuGetAssembly = assemblyName.Name == null || NuGetAssembly.MatchesName(assemblyName.Name);
// Originally I wanted to also check the strong name token, to reduce the risk that someone compiled their
// code against a custom NuGet assembly with APIs that we don't ship. However, JetBrains compiled their
// products against custom NuGet assemblies with a different public token, so we can't do that check if we
// want to find out which APIs they're using.
return(isNuGetAssembly);
}
internal static bool HasReferenceToNuGetAssembly(MetadataReader metadata)
{
foreach (var assemblyReferenceHandle in metadata.AssemblyReferences)
{
var assemblyReference = metadata.GetAssemblyReference(assemblyReferenceHandle);
if (NuGetAssembly.IsNuGetAssembly(assemblyReference))
{
return(true);
}
}
return(false);
}
private static UsageInformation?GetApisUsedByAssembly(string file)
{
// Skip NuGet's own assemblies
string filename = Path.GetFileNameWithoutExtension(file);
if (NuGetAssembly.MatchesName(filename) ||
filename.Equals("NuGet.Core", StringComparison.OrdinalIgnoreCase))
{
return(null);
}
if (filename.StartsWith("NuGet.", StringComparison.OrdinalIgnoreCase))
{
Console.Error.WriteLine("Suspicious assembly name: " + file);
}
using var fileStream = File.OpenRead(file);
using var peReader = new PEReader(fileStream);
MetadataReader metadata;
try
{
metadata = peReader.GetMetadataReader();
}
catch (InvalidOperationException)
{
// Not a .NET assembly
return(null);
}
if (!AssemblyAnalyser.HasReferenceToNuGetAssembly(metadata))
{
return(null);
}
UsageInformation usedNuGetApis = AssemblyAnalyser.FindUsedNuGetApis(metadata);
return(usedNuGetApis);
}
internal static UsageInformation FindUsedNuGetApis(MetadataReader metadata)
{
var result = new UsageInformation();
void AddMember(string assembly, string member)
{
if (!result.MemberReferences.TryGetValue(assembly, out HashSet <string>?apis))
{
apis = new HashSet <string>();
result.MemberReferences[assembly] = apis;
}
apis.Add(member);
}
foreach (var memberReferenceHandle in metadata.MemberReferences)
{
var memberReference = metadata.GetMemberReference(memberReferenceHandle);
var foundAssemblyReference = TryFindAssemblyReference(memberReferenceHandle, metadata, out var assemblyReference);
if (foundAssemblyReference && NuGetAssembly.IsNuGetAssembly(assemblyReference))
{
var assemblyName = assemblyReference.GetAssemblyName();
var version = assemblyName.Version?.ToString();
if (version != null)
{
result.Versions.Add(version);
}
var kind = memberReference.GetKind();
switch (kind)
{
case MemberReferenceKind.Method:
{
var(assembly, member) = TypeNameGenerator.GetFullName(memberReferenceHandle, metadata);
var sig = memberReference.DecodeMethodSignature(MethodSignatureDecoder.Default, null);
var methodSignature = GetMethodSignature(member, sig);
AddMember(assembly, methodSignature);
}
break;
case MemberReferenceKind.Field:
{
var(assembly, member) = TypeNameGenerator.GetFullName(memberReferenceHandle, metadata);
AddMember(assembly, member);
}
break;
default:
throw new NotImplementedException(kind.ToString());
}
}
}
if (result.MemberReferences.SelectMany(r => r.Value).Any())
{
if (TryGetTargetFramework(metadata, out string?targetFramework))
{
result.TargetFrameworks.Add(targetFramework);
}
}
return(result);
}
