start working on custom chat handlers

CustomChatAddOns/CustomChatAddOns.cs

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+using Kruzya.TelegramBot.Core;
+using Kruzya.TelegramBot.Core.Extensions;
+using Kruzya.TelegramBot.CustomChatAddOns.Options;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns
+{
+    public class CustomChatAddOns : Module
+    {
+        public CustomChatAddOns(Core.Core core) : base(core)
+        {
+        }
+
+        public override void ConfigureServices(IServiceCollection services)
+        {
+            services.AddOption<CustomChatHandler>();
+        }
+    }
+}

CustomChatAddOns/CustomChatAddOns.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+	  <AssemblyName>TelegramBot.CustomChatAddOns</AssemblyName>
+	  <RootNamespace>Kruzya.TelegramBot.CustomChatAddOns</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Core\Core.csproj" />
+  </ItemGroup>
+
+</Project>

CustomChatAddOns/Data/Ping.cs

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+using Kruzya.TelegramBot.Core.Attributes;
+using Newtonsoft.Json;
+using Telegram.Bot.Types;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns.Data
+{
+    [AllowedSerializableType("ping")]
+    public class Ping
+    {
+        [JsonProperty("chat_id")]
+        public long ChatId { get; set; }
+
+        [JsonProperty("user_id")]
+        public long UserId { get; set; }
+
+        [JsonProperty("confirmation")]
+        public string Confirmation { get; set; } = Guid.NewGuid().ToString();
+
+        public Ping From(Message message) => new() {
+            ChatId = message.Chat.Id,
+            UserId = message.From!.Id
+        };
+    }
+}

CustomChatAddOns/Data/Pong.cs

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+using Kruzya.TelegramBot.Core.Attributes;
+using Newtonsoft.Json;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns.Data
+{
+    [AllowedSerializableType("pong")]
+    public class Pong
+    {
+        [JsonProperty("confirmation")]
+        public string Confirmation { get; set; } = Guid.NewGuid().ToString();
+    }
+}

CustomChatAddOns/Handler/Config.cs

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+using BotFramework.Attributes;
+using Kruzya.TelegramBot.Core.Data;
+using Kruzya.TelegramBot.Core.Extensions;
+using Kruzya.TelegramBot.Core.Handler;
+using Kruzya.TelegramBot.Core.Service;
+using Kruzya.TelegramBot.CustomChatAddOns.Options;
+using Telegram.Bot.Types.Enums;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns.Handler
+{
+    public class Config : CommonHandler
+    {
+        private readonly CustomChatHandler _option;
+        private readonly UserService _userService;
+
+        public Config(CustomChatHandler option, UserService userService, CoreContext db) : base(db)
+        {
+            _option = option;
+            _userService = userService;
+            
+        }
+
+        private bool IsAllowedChatType(ChatType chatType)
+        {
+            // TODO: move to class constant.
+            var allowedChatTypes = new[] { ChatType.Supergroup, ChatType.Group, ChatType.Channel };
+            return allowedChatTypes.Contains(chatType);
+        }
+
+        [ParametrizedCommand("set_custom_handler")]
+        public async Task Handle(Uri endpoint)
+        {
+            if (!IsAllowedChatType(Chat.Type))
+            {
+                return;
+            }
+
+            if (!await Bot.IsUserAdminAsync(Chat, From))
+            {
+                await Reply("Sorry, you cannot do this");
+                return;
+            }
+
+            // URLs to somewhere in local bot network should be allowed for using only super-admins.
+            // It may be bypassed via using, for example, "kitties" instead of "kitties.bot.svc.cluster.local". Maybe check resulting IP?
+            if (endpoint.Host.EndsWith(".local") && !_userService.IsUserSuper(From.Id))
+            {
+                await Reply("Sorry, you cannot do this");
+                return;
+            }
+
+            // TODO: perform a "ping" request to endpoint. "Ping" should contain chat id and user id who performs this action.
+            await _option.SetValueAsync(Chat.Id, endpoint.ToString());
+            await Reply("Done, configured");
+        }
+    }
+}

CustomChatAddOns/Options/CustomChatHandler.cs

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+using Kruzya.TelegramBot.Core.Options;
+
+namespace Kruzya.TelegramBot.CustomChatAddOns.Options
+{
+    public class CustomChatHandler : AbstractOption<CustomChatHandler, string>
+    {
+        public CustomChatHandler(IOptionProvider optionProvider) : base(optionProvider)
+        {
+        }
+
+        public override string OptionId => "customChatHandlerUrl";
+
+        public override string OptionName => "Custom Chat Handler";
+
+        public override OptionType OptionType => OptionType.Hidden;
+
+        public override string DefaultValue => "";
+    }
+}