annotations/Azaion.CommonSecurity/Services/ResourceLoader.cs

using Azaion.CommonSecurity.DTO;

namespace Azaion.CommonSecurity.Services;

public interface IResourceLoader
{
    Task<MemoryStream> Load(string fileName, CancellationToken cancellationToken = default);
}

public class ResourceLoader(AzaionApiClient api, ApiCredentials credentials) : IResourceLoader
{
    public async Task<MemoryStream> Load(string fileName, CancellationToken cancellationToken = default)
    {
        var hardwareService = new HardwareService();
        var hardwareInfo = hardwareService.GetHardware();

        var encryptedStream = Task.Run(() => api.GetResource(fileName, credentials.Password, hardwareInfo), cancellationToken).Result;

        var key = Security.MakeEncryptionKey(credentials.Email, credentials.Password, hardwareInfo.Hash);
        var stream = new MemoryStream();
        await encryptedStream.DecryptTo(stream, key, cancellationToken);
        stream.Seek(0, SeekOrigin.Begin);
        return stream;
    }
}