VEU.WathBody/3-app/1-lib/Kit.Helpers/HttpContext.cs

using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Primitives;
using System;
using System.Linq;

namespace Kit.Helpers
{
    public static class HttpContextCore
    {
        private static IServiceProvider _serviceProvider;
        private static bool _notWebApp;

        public static void Configure(IServiceProvider serviceProvider)
        {
            _serviceProvider = serviceProvider;
            _notWebApp = false;
        }

        public static void ConfigureNotWebApp()
        {
            _notWebApp = true;
        }

        public static HttpContext Current
        {
            get
            {
                if (_notWebApp)
                {
                    return null;
                }
                object factory = _serviceProvider.GetService(typeof(IHttpContextAccessor));

                HttpContext context = ((HttpContextAccessor)factory).HttpContext;

                return context;
            }
        }

        private static readonly string _contextHostUrl = "HostUrl";

        public static string GetHostUrl(this HttpContext context)
        {
            context.Items[_contextHostUrl] = context.Items[_contextHostUrl] as string ?? context.GenerateHostUrl();
            return context.Items[_contextHostUrl]!.ToString()!;
        }

        public static string GetRootUrl(this HttpContext context)
        {
            return $"{GetHostUrl(context)}{context.Request.PathBase}{context.Request.Path}";
        }

        private static string GenerateHostUrl(this HttpContext context)
        {
            HttpRequest request = context.Request;

            // Формируем RootUrl
            string scheme = request.Scheme;

            if (request.Headers.TryGetValue("X-Forwarded-Proto", out StringValues forwardedProtoValues) && forwardedProtoValues.Count > 0)
            {
                scheme = forwardedProtoValues.First();
            }

            return $"{scheme}://{request.Host}";
        }
    }
}