yaflay.ru/Pages/Authorize.cshtml

@page "{code}"
@model yawaflua.ru.Pages.AuthorizeModel
@using System.Text.Json.Nodes
@using Newtonsoft.Json
@{
    string path = $"{Request.Method}//{Request.Host}";
    ViewData["Title"] = "Authorize";
    string authorizationUrl = $"https://discord.com/api/oauth2/authorize?client_id={Startup.clientId}&response_type=code&redirect_uri={Startup.redirectUrl}&scope=identify";
    <p style="display:none;">Data: @Startup.clientId @Startup.redirectUrl [@String.Join(",", Startup.ownerId)] @Model.code</p>
    if (Model.code == null)
    {
        if (Request.Cookies["melon"]?.ToString() == null)
        {
            <a href="@authorizationUrl">Login while Discord</a>
        }
        else
        {
            HttpResponseMessage message;
            using (var requestMessage =
                new HttpRequestMessage(HttpMethod.Get, "https://discordapp.com/api/oauth2/@me"))
            {
                requestMessage.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", Request.Cookies["melon"]); ;
                message = await Startup.client.SendAsync(requestMessage);
            }
            string responseBody = await message.Content.ReadAsStringAsync();
            JsonNode response = JsonNode.Parse(responseBody);
            if (response["user"] != null)
            {
                <h4>Вы авторизованы!</h4>
                <a href="/AdminPanel"> Админка </a>
                
            }
            else
            {
                <h4>
                    Токен авторизации неправильный! Попробуйте <a href="@authorizationUrl">заново</a>
                </h4>
            }

        }
    }
    else
    {

        HttpResponseMessage message;
        using (var requestMessage =
            new HttpRequestMessage(HttpMethod.Post, "https://discordapp.com/api/oauth2/token"))
        {
            requestMessage.Content = new StringContent(
                @$"grant_type=authorization_code&code={Model.code}&client_id={Startup.clientId}&client_secret={Startup.clientSecret}&scope=identify&redirect_uri={Startup.redirectUrl}", 
                new System.Net.Http.Headers.MediaTypeHeaderValue("application/x-www-form-urlencoded")
                );
            message = await Startup.client.SendAsync(requestMessage);
        }
        string responseBody = await message.Content.ReadAsStringAsync();
        JsonNode body = JsonNode.Parse(responseBody);
        if (body["access_token"]?.ToString() == null)
        {
            <h4>Ошибка! Попробуй авторизоваться заново</h4>

            Console.Error.WriteLine("debug: START \\/ \ninfo: Don't worry, this message is not bad as you think");
            Console.Error.WriteLine("error: DiscordAuthorize is not worked");
            Console.Error.WriteLine($"debug: Body from discord: {body}\ndebug: Sended data to discord: {message.Content.ReadAsStringAsync().Result}");
            Console.Error.WriteLine($"info: Check environment data: \n  ClientId={Startup.clientId}\n   ClientSecret={Startup.clientSecret}\n   RedirectUrl={Startup.redirectUrl}\n OwnerId={String.Join(",", Startup.ownerId)} ");
            Console.Error.WriteLine("info: If any data is null and you set data in environment or appsettings.json, please create issue with this debug messages ");
            Console.Error.WriteLine("debug: END /\\");
        }
        else
        {
            Response.Cookies.Append("melon", body["access_token"].ToString());
            Response.Cookies.Append("watermelon", body["refresh_token"].ToString());
            try
            {
                HttpContent bodytoApi;
                bodytoApi = new StringContent(JsonConvert.SerializeObject(new yawaflua.ru.Controllers.ApiController.authorizeBody()
                    {
                        discordId = body["user"]["id"].ToString(),
                        melon = body["access_token"].ToString(),
                        type = Auth.ApiKeyTypes.Public,
                        watermelon = body["watermelon"].ToString()
                    }));
                var req = await Startup.client.PostAsync(path + "/api/authorize", bodytoApi);
            }
            catch(Exception ex)
            {
                Console.WriteLine(body);
                Console.WriteLine(ex.Message);
            }
            
            Response.Redirect("/authorize", true);
        }
    }
}