wabbajack/Wabbajack.CLI/Verbs/Decrypt.cs

using System.CommandLine;
using System.CommandLine.Invocation;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Wabbajack.Paths;
using Wabbajack.Paths.IO;
using Wabbajack.Services.OSIntegrated;

namespace Wabbajack.CLI.Verbs
{
    public class Decrypt : IVerb
    {
        private readonly ILogger<Decrypt> _logger;

        public Decrypt(ILogger<Decrypt> logger)
        {
            _logger = logger;
        }
        
        public Command MakeCommand()
        {
            var command = new Command("decrypt");
            command.Add(new Option<AbsolutePath>(new[] { "-o", "-output" }, "Output file path"));
            command.Add(new Option<string>(new[] { "-n", "-name" }, "Name of the key to load data from"));
            command.Description = "Decrypts a file from the Wabbajack encrypted storage";
            command.Handler = CommandHandler.Create(Run);
            return command;
        }
        
        public async Task<int> Run(AbsolutePath output, string name)
        {
            var data = await name.ToRelativePath()
                .RelativeTo(KnownFolders.WabbajackAppLocal.Combine("encrypted"))
                .FromEncryptedDataFile();
            _logger.LogInformation("Decrypting {bytes} bytes into `{key}`", data.Length, name);
            await output.WriteAllBytesAsync(data);

            return 0;
        }
    }
}