FileFlowsPlugins/Telegram/Communication/Telegram.cs

namespace FileFlows.Telegram.Communication;

/// <summary>
/// A Telegram flow element that sends a message
/// </summary>
public class Telegram: Node
{
    /// <summary>
    /// Gets the number of inputs to this flow element
    /// </summary>
    public override int Inputs => 1;
    /// <summary>
    /// Gets the number of outputs to this flow element
    /// </summary>
    public override int Outputs => 2;
    /// <summary>
    /// Gets the type of flow element
    /// </summary>
    public override FlowElementType Type => FlowElementType.Communication;
    /// <summary>
    /// Gets the icon for this flow element
    /// </summary>
    public override string Icon => "fas fa-bell";
    /// <summary>
    /// Gets if this can be used in a failure flow
    /// </summary>
    public override bool FailureNode => true;
    
    /// <summary>
    /// Gets the Help URL
    /// </summary>
    public override string HelpUrl => "https://fileflows.com/docs/plugins/telegram";

    /// <summary>
    /// Gets or sets the message to send
    /// </summary>
    [Required]
    [TextVariable(1)]
    public string Message { get; set; }

    /// <summary>
    /// Sends a telegram message
    /// </summary>
    /// <param name="botToken">the bot token</param>
    /// <param name="chatId">the chat id</param>
    /// <param name="message">the message to send</param>
    /// <returns>true if successful, otherwise false</returns>
    internal static bool SendMessage(string botToken, string chatId, string message)
    {
        using (HttpClient client = new HttpClient())
        {
            string apiUrl = $"https://api.telegram.org/bot{botToken}/sendMessage";
            
            var content = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("chat_id", chatId),
                new KeyValuePair<string, string>("text", message)
            });

            var response = client.PostAsync(apiUrl, content).Result;
            return response.IsSuccessStatusCode;
        }
    }

    /// <summary>
    /// Executes the flow element
    /// </summary>
    /// <param name="args">the node parameters</param>
    /// <returns>the output to call next</returns>
    public override int Execute(NodeParameters args)
    {
        try
        {
            var settings = args.GetPluginSettings<PluginSettings>();

            if (settings == null)
            {
                args.Logger?.ILog("Failed to load plugin settings");
                return 2;
            }

            if (string.IsNullOrWhiteSpace(settings?.BotToken))
            {
                args.Logger?.WLog("No Bot Token set");
                return 2;
            }

            if (string.IsNullOrWhiteSpace(settings?.ChatId))
            {
                args.Logger?.WLog("No Chat ID set");
                return 2;
            }

            var message = args.ReplaceVariables(Message);

            var result = SendMessage(settings.BotToken, settings.ChatId, message);

            return result ? 1 : 2;
        }
        catch (Exception ex)
        {
            args.Logger?.WLog("Error sending message: " + ex.Message);
            return 2;
        } 
    }
}