sharp-chat/SharpChat/Flashii/FlashiiBump.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace SharpChat.Flashii {
    public class FlashiiBump {
        [JsonPropertyName(@"id")]
        public long UserId { get; set; }

        [JsonPropertyName(@"ip")]
        public string UserIP { get; set; }

        public static async Task SubmitAsync(HttpClient httpClient, IEnumerable<ChatUser> users) {
            FlashiiBump[] bups = users.Where(u => u.HasSessions).Select(x => new FlashiiBump {
                UserId = x.UserId,
                UserIP = x.RemoteAddresses.First().ToString()
            }).ToArray();

            if(bups.Any())
                await SubmitAsync(httpClient, bups);
        }

        public static async Task SubmitAsync(HttpClient httpClient, IEnumerable<FlashiiBump> users) {
            if(httpClient == null)
                throw new ArgumentNullException(nameof(httpClient));
            if(users == null)
                throw new ArgumentNullException(nameof(users));
            if(!users.Any())
                return;

            byte[] data = JsonSerializer.SerializeToUtf8Bytes(users);

            HttpRequestMessage request = new(HttpMethod.Post, FlashiiUrls.BumpURL) {
                Content = new ByteArrayContent(data),
                Headers = {
                    { @"X-SharpChat-Signature", data.GetSignedHash() },
                }
            };

            await httpClient.SendAsync(request);
        }
    }
}