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TelegramConnection.cs
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TelegramConnection.cs
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using SpeechToText.ViewModels;
using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.Text.Encodings.Web;
using System.Web;
using Telegram.Bot;
using Telegram.Bot.Exceptions;
using Telegram.Bot.Polling;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;
using System.Threading;
namespace SpeechToText
{
public class TelegramConnection
{
internal string Token => Settings.Instance.TelegramToken;
private static string ChatId => Settings.Instance.TelegramGroup;
private readonly TelegramBotClient _client;
public TelegramConnection()
{
// Create client
if (_client != null)
return;
_client = new TelegramBotClient(Settings.Instance.TelegramToken);
// Subscribe to messages
ReceiverOptions receiverOptions = new()
{
AllowedUpdates = Array.Empty<UpdateType>()
};
using CancellationTokenSource cts = new();
_client.StartReceiving(
updateHandler: HandleMessage,
pollingErrorHandler: HandlePollingError,
receiverOptions: receiverOptions,
cancellationToken: cts.Token
);
Logging.Log("Started listening to telegram updates");
}
private async Task HandleMessage(ITelegramBotClient bot, Update update, CancellationToken cancelToken)
{
if (update.Message == null)
return;
string id = update.Message.Chat.Id.ToString();
string text = update.Message.Text ?? "null";
Logging.Log($"Telegram message received from {id}: " + text);
// Only react to messages from these two sources
if (id != Settings.Instance.TelegramGroup && id != Settings.Instance.TelegramDebugGroup)
{
Logging.Log("Ignoring message from unauthorized user or group");
return;
}
// Handle commands, send confirmations
if (text.StartsWith("/starttranslation"))
{
Logging.Log("Received /starttranslation");
bool success = PlaystateViewModel.ChangeFromTelegramCommand(translate: true);
if (success)
await Send("Starting translation");
else
await Send("Translation is already in progress");
}
else if (text.StartsWith("/stoptranslation"))
{
Logging.Log("Received /stoptranslation");
bool success = PlaystateViewModel.ChangeFromTelegramCommand(translate: false);
if (success)
await Send("Stopping translation");
else
await Send("Translation is already stopped");
}
else if (text.StartsWith("/ping"))
{
await Send("Pong!", id);
}
}
private Task HandlePollingError(ITelegramBotClient botClient, Exception exception, CancellationToken cancellationToken)
{
string error = exception switch
{
ApiRequestException apiRequestException
=> $"Telegram API Error: {apiRequestException.ErrorCode}: {apiRequestException.Message}",
_ => exception.ToString()
};
Logging.Log(error, LogLevel.Exception);
return Task.CompletedTask;
}
/// <summary>
/// Send a message to <see cref="ChatId"/> if <see cref="PlaystateViewModel.Instance.IsPosting"/> is true
/// </summary>
public async Task Send(string text)
{
if (string.IsNullOrEmpty(Token) || string.IsNullOrEmpty(ChatId) || !PlaystateViewModel.Instance.IsPosting)
return;
await _client.SendTextMessageAsync(ChatId, text);
}
/// <summary>
/// Send a message to <paramref name="chatId"/>
/// </summary>
public async Task Send(string text, string chatId)
{
await _client.SendTextMessageAsync(chatId, text);
}
}
}