LibHac/build/RepackNuget.cs

using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Xml.Linq;
using ICSharpCode.SharpZipLib.Zip;
using Nuke.Common.Tools.NuGet;
using static Nuke.Common.IO.FileSystemTasks;
using static Nuke.Common.IO.PathConstruction;

namespace LibHacBuild
{
    public partial class Build
    {
        public void RepackNugetPackage(string path)
        {
            AbsolutePath tempDir = TempDirectory / Path.GetFileName(path);
            AbsolutePath libDir = tempDir / "lib";
            AbsolutePath relsFile = tempDir / "_rels" / ".rels";

            try
            {
                EnsureCleanDirectory(tempDir);
                List<string> fileList = UnzipPackage(path, tempDir);

                string newPsmdcpName = CalcPsmdcpName(libDir);
                string newPsmdcpPath = RenamePsmdcp(tempDir, newPsmdcpName);
                EditManifestRelationships(relsFile, newPsmdcpPath);

                int index = fileList.FindIndex(x => x.Contains(".psmdcp"));
                fileList[index] = newPsmdcpPath;

                IEnumerable<string> files = Directory.EnumerateFiles(tempDir, "*.json", SearchOption.AllDirectories)
                    .Concat(Directory.EnumerateFiles(tempDir, "*.xml", SearchOption.AllDirectories))
                    .Concat(Directory.EnumerateFiles(tempDir, "*.rels", SearchOption.AllDirectories))
                    .Concat(Directory.EnumerateFiles(tempDir, "*.psmdcp", SearchOption.AllDirectories))
                    .Concat(Directory.EnumerateFiles(tempDir, "*.nuspec", SearchOption.AllDirectories));

                foreach (string filename in files)
                {
                    Console.WriteLine(filename);
                    ReplaceLineEndings(filename);
                }

                ZipDirectory(path, tempDir, fileList);
            }
            finally
            {
                Directory.Delete(tempDir, true);
            }
        }

        public List<string> UnzipPackage(string package, string dest)
        {
            var fileList = new List<string>();

            UnzipFiles(package, dest);

            using (var s = new ZipInputStream(File.OpenRead(package)))
            {
                ZipEntry entry;
                while ((entry = s.GetNextEntry()) != null)
                {
                    fileList.Add(entry.Name);
                }
            }

            return fileList;
        }

        public static string CalcPsmdcpName(string libDir)
        {
            using (SHA256 sha = SHA256.Create())
            {
                foreach (string file in Directory.EnumerateFiles(libDir))
                {
                    byte[] data = File.ReadAllBytes(file);
                    sha.TransformBlock(data, 0, data.Length, data, 0);
                }

                sha.TransformFinalBlock(new byte[0], 0, 0);

                return ToHexString(sha.Hash).ToLower().Substring(0, 32);
            }
        }

        public static string RenamePsmdcp(string packageDir, string name)
        {
            string fileName = Directory.EnumerateFiles(packageDir, "*.psmdcp", SearchOption.AllDirectories).Single();
            string newFileName = Path.Combine(Path.GetDirectoryName(fileName), name + ".psmdcp");
            Directory.Move(fileName, newFileName);

            return Path.GetRelativePath(packageDir, newFileName).Replace('\\', '/');
        }

        [SuppressMessage("ReSharper", "PossibleNullReferenceException")]
        public void EditManifestRelationships(string path, string psmdcpPath)
        {
            XDocument doc = XDocument.Load(path);
            XNamespace ns = doc.Root.GetDefaultNamespace();

            foreach (XElement rs in doc.Root.Elements(ns + "Relationship"))
            {
                using (SHA256 sha = SHA256.Create())
                {
                    if (rs.Attribute("Target").Value.Contains(".psmdcp"))
                    {
                        rs.Attribute("Target").Value = "/" + psmdcpPath;
                    }

                    string s = "/" + psmdcpPath + rs.Attribute("Target").Value;
                    byte[] hash = sha.ComputeHash(Encoding.UTF8.GetBytes(s));
                    string id = "R" + ToHexString(hash).Substring(0, 16);
                    rs.Attribute("Id").Value = id;
                }
            }

            doc.Save(path);
        }

        public void SignNupkg(string pkgPath, string password)
        {
            NuGetTasks.NuGet(
                $"sign \"{pkgPath}\" -CertificatePath cert.pfx -CertificatePassword {password} -Timestamper http://timestamp.digicert.com",
                outputFilter: x => x.Replace(password, "hunter2"));
        }

        public static string ToHexString(byte[] arr)
        {
            return BitConverter.ToString(arr).ToLower().Replace("-", "");
        }
    }
}