Add menu command

Common.Configurations.targets

@@ -30,5 +30,6 @@
     <PackageReference Include="LTDO.Kernel.EFSupport" Version="1.0.8" />
     <PackageReference Include="LTDO.Kernel.RedisSupport" Version="1.0.15" />
     <PackageReference Include="LTDO.Models" Version="1.0.59" />
+    <PackageReference Include="Telegram.Bot" Version="19.0.0" />
   </ItemGroup>
 </Project>

src/TelegramService.Broker/Configurations/TelegramBotConfig.cs

@@ -0,0 +1,9 @@
+namespace LT.DigitalOffice.TelegramService.Broker.Configurations;
+
+public class TelegramBotConfig
+{
+  public string BotToken { get; set; }
+  public string BotSecretToken { get; set; }
+  public string BotHostAddress { get; set; }
+  public string BotRoute { get; set; }
+}

src/TelegramService.Business/Features/Bot/Resources/BotResources.resx

@@ -0,0 +1,136 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="EventsCalendarOption" xml:space="preserve">
+    <value>Календарь событий</value>
+  </data>
+  <data name="BookingOption" xml:space="preserve">
+    <value>Бронирование</value>
+  </data>
+  <data name="SurveysOption" xml:space="preserve">
+    <value>Опросы</value>
+  </data>
+  <data name="UsageMessage" xml:space="preserve">
+    <value>Использование: 
+/menu - меню</value>
+  </data>
+  <data name="MenuMessage" xml:space="preserve">
+    <value>Главное меню:</value>
+  </data>
+</root>

src/TelegramService.Business/Features/Bot/UpdateHandler.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using LT.DigitalOffice.TelegramService.Business.Features.Bot.Resources;
+using Microsoft.Extensions.Logging;
+using Telegram.Bot;
+using Telegram.Bot.Exceptions;
+using Telegram.Bot.Types;
+using Telegram.Bot.Types.ReplyMarkups;
+
+namespace LT.DigitalOffice.TelegramService.Business.Features.Bot;
+
+public class UpdateHandler
+{
+  private readonly ITelegramBotClient _botClient;
+  private readonly ILogger<UpdateHandler> _logger;
+
+  public UpdateHandler(ITelegramBotClient botClient, ILogger<UpdateHandler> logger)
+  {
+    _botClient = botClient;
+    _logger = logger;
+  }
+
+  public Task HandleErrorAsync(Exception exception, CancellationToken ct)
+  {
+    var errorMessage = exception switch
+    {
+      ApiRequestException apiRequestException => $"Telegram API Error:\n[{apiRequestException.ErrorCode}]\n{apiRequestException.Message}",
+      _ => exception.ToString()
+    };
+
+    _logger.LogInformation("HandleError: {ErrorMessage}", errorMessage);
+    return Task.CompletedTask;
+  }
+
+  public async Task HandleUpdateAsync(Update update, CancellationToken ct)
+  {
+    var handler = update switch
+    {
+      { Message: { } message } => MessageReceivedAsync(message, ct),
+      _ => UnknownUpdateReceivedAsync(update)
+    };
+
+    await handler;
+  }
+
+  private async Task MessageReceivedAsync(Message message, CancellationToken ct)
+  {
+    _logger.LogInformation("Receive message type: {MessageType}", message.Type);
+    if (message.Text is not { } messageText)
+      return;
+
+    var action = messageText.Split(' ')[0] switch
+    {
+      "/menu" => SendMenuAsync(_botClient, message, ct),
+      _ => SendUsageAsync(_botClient, message, ct)
+    };
+    Message sentMessage = await action;
+    _logger.LogInformation("The message was sent with id: {SentMessageId}", sentMessage.MessageId);
+  }
+
+  private async Task<Message> SendMenuAsync(ITelegramBotClient botClient, Message message, CancellationToken ct)
+  {
+    InlineKeyboardMarkup inlineKeyboard = new(
+      new[]
+      {
+        new []
+        {
+          InlineKeyboardButton.WithCallbackData(BotResources.EventsCalendarOption, "1")
+        },
+        new []
+        {
+          InlineKeyboardButton.WithCallbackData(BotResources.BookingOption, "2"),
+          InlineKeyboardButton.WithCallbackData(BotResources.SurveysOption, "3"),
+        },
+      });
+
+    return await botClient.SendTextMessageAsync(
+      chatId: message.Chat.Id,
+      text: BotResources.MenuMessage,
+      replyMarkup: inlineKeyboard,
+      cancellationToken: ct);
+  }
+
+  private async Task<Message> SendUsageAsync(ITelegramBotClient botClient, Message message, CancellationToken ct)
+  {
+    return await botClient.SendTextMessageAsync(
+      chatId: message.Chat.Id,
+      text: BotResources.UsageMessage,
+      replyMarkup: new ReplyKeyboardRemove(),
+      cancellationToken: ct);
+  }
+
+  private Task UnknownUpdateReceivedAsync(Update update)
+  {
+    _logger.LogInformation("Unknown update type: {UpdateType}", update.Type);
+    return Task.CompletedTask;
+  }
+}