ASP.Net Core Auth Discord API Extention [AspNet.Security.OAuth.Discord]

DiscordApiExtention.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Security.Claims;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication.OAuth;
using Newtonsoft.Json.Linq;

/*
* Credits To HarryET#2954 & https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers/issues/209
*/

namespace Website.Extensions
{
    public static class DiscordApiExtention
    {
        public static async Task<Claim> GetGuildClaims(OAuthCreatingTicketContext context)
        {
            var request = new HttpRequestMessage(HttpMethod.Get, "https://discord.com/api/users/@me/guilds");
            request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", context.AccessToken);

            var response = await context.Backchannel.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, CancellationToken.None);
            if (!response.IsSuccessStatusCode)
            {
                throw new Exception("failed to get guilds");
            }

            var payload = JArray.Parse(await response.Content.ReadAsStringAsync());
            Claim claim = new Claim("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/guilds", payload.ToString(),ClaimValueTypes.String);
            return claim;
        }

        public static async Task<Claim> GetGuildMemberData(OAuthCreatingTicketContext context)
        {
            string BotToken = "BOT_TOKEN";
            string GuildId = "GUILD_ID";
            string MemberId = "";
            foreach (var claim in context.Identity.Claims)
            {
                if (claim.Type == "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier")
                {
                    MemberId = claim.Value;
                }
            }

            var request = new HttpRequestMessage(HttpMethod.Get, $"https://discord.com/api/guilds/{GuildId}/members/{MemberId}");
            request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            request.Headers.Authorization = new AuthenticationHeaderValue("Bot", BotToken);

            var response = await context.Backchannel.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, CancellationToken.None);
            if (!response.IsSuccessStatusCode)
            {
                throw new Exception("failed to get member data");
            }

            var payload = JObject.Parse(await response.Content.ReadAsStringAsync());

            return new Claim("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/guildsMemberData", payload.ToString(), ClaimValueTypes.String);
        }
    }
}

startup.cs

/*
* CODE HERE
*/

.AddDiscord(options =>
{
    options.ClientId = "Client Id";
    options.ClientSecret = "Client Secret";
    options.Scope.Add("guilds");
    options.SaveTokens = true;
    options.Events = new OAuthEvents
    {
        OnCreatingTicket = async context =>
        {
            Claim guildClaim = await DiscordApiExtention.GetGuildClaims(context);
            context.Identity.AddClaim(guildClaim);

            Claim guildMemberData = await DiscordApiExtention.GetGuildMemberData(context);
            context.Identity.AddClaim(guildMemberData);
        }
    };
});

/*
* CODE HERE
*/