Let’s implement a simple Telegram API for receiving \/ sending messages.<\/span><\/p>\nusing RestSharp;\r\n\r\n\r\n\r\n\r\nnamespace BotZabbix\r\n\r\n{\r\n\r\nclass TelegramAPI\r\n\r\n{\r\n\r\nconst string API_URL = \"https:\/\/api.telegram.org\/bot\" + AppSettings.BotToken + \"\/\";\r\n\r\n\r\n\r\n\r\npublic string sendAPIRequest(string _apiMethod, string _params)\r\n\r\n{\r\n\r\nRestClient RC = new RestClient();\r\n\r\nvar Url = API_URL + _apiMethod + \"?\" + _params;\r\n\r\nvar Request = new RestRequest(Url);\r\n\r\nvar Response = RC.Get(Request);\r\n\r\n\r\n\r\n\r\nreturn Response.Content;\r\n\r\n}\r\n\r\n}\r\n\r\n\r\n\r\n\r\npublic class APIResult\r\n\r\n{\r\n\r\npublic Update[] Result { get; set; }\r\n\r\n}\r\n\r\n\r\n\r\n\r\npublic class Update\r\n\r\n{\r\n\r\npublic int update_id { get; set; }\r\n\r\npublic Message message { get; set; }\r\n\r\n}\r\n\r\n\r\n\r\n\r\npublic class Message\r\n\r\n{\r\n\r\npublic Chat chat { get; set; }\r\n\r\npublic string text { get; set; }\r\n\r\n}\r\n\r\n\r\n\r\n\r\npublic class Chat\r\n\r\n{\r\n\r\npublic int id { get; set; }\r\n\r\npublic string first_name { get; set; }\r\n\r\npublic string last_name { get; set; }\r\n\r\n}\r\n\r\n}<\/pre>\n <\/p>\n
\u00a0<\/strong><\/p>\nHere AppSettings.BotToken<\/strong> is the token that Telegram issues when creating a bot.<\/span><\/p>\nIf you call the sendAPIRequest method with the following parameters:<\/span><\/p>\nsendAPIRequest(“sendMessage”, $”chat_id={_idChat}&text={BotHelpers.CheckText(_text)}”)<\/strong><\/p>\n\u00a0<\/strong><\/p>\nthen we will send a message to the user with id = _idChat and the text stored in the _text variable.<\/span> To receive messages, you need to call the above method as follows:<\/span><\/p>\nsendAPIRequest(“getUpdates”, $”offset={lastUpdateId}”)<\/strong><\/p>\n\u00a0<\/strong><\/p>\nwhere lastUpdateId is the id of the last received message.<\/span><\/p>\nTo implement the process of receiving email, we will write the following class:<\/span><\/p>\n <\/p>\n
using System;<\/code><\/p>\nusing System.Collections.Generic;<\/code><\/p>\n <\/p>\n
namespace BotZabbix<\/code><\/p>\n{<\/code><\/p>\nclass Email<\/code><\/p>\n{<\/code><\/p>\npublic List<string> GetMail()<\/code><\/p>\n{<\/code><\/p>\nint MailCount = 0;<\/code><\/p>\nList<string> Mails = new List<string>();<\/code><\/p>\n <\/p>\n
try<\/code><\/p>\n{<\/code><\/p>\nusing (AE.Net.Mail.ImapClient ic = new \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0AE.Net.Mail.ImapClient(AppSettings.MailServer,<\/code><\/p>\nAppSettings.MailUser,<\/code><\/p>\nAppSettings.MailPassword, AE.Net.Mail.AuthMethods.Login,<\/code><\/p>\nAppSettings.MailServerPort, true))<\/code><\/p>\n{<\/code><\/p>\nic.SelectMailbox(\"INBOX\");<\/code><\/p>\nAE.Net.Mail.MailMessage[] mm = ic.GetMessages(0, 50, false);<\/code><\/p>\n <\/p>\n
foreach (AE.Net.Mail.MailMessage m in mm)<\/code><\/p>\n{<\/code><\/p>\nMailCount++;<\/code><\/p>\nif (m.From.ToString().Contains(\"Zabbix\"))<\/code><\/p>\n{<\/code><\/p>\nMails.Add(m.Body);<\/code><\/p>\nic.DeleteMessage(m);<\/code><\/p>\n}<\/code><\/p>\nelse<\/code><\/p>\n{<\/code><\/p>\nLogger.Log(m.From.ToString());<\/code><\/p>\nLogger.Log(m.Body.ToString());<\/code><\/p>\nic.DeleteMessage(m);<\/code><\/p>\n}<\/code><\/p>\n}<\/code><\/p>\nLogger.Log($\"::: {DateTime.Now} Mail count: {MailCount}\");<\/code><\/p>\nic.Dispose();<\/code><\/p>\n}<\/code><\/p>\n}<\/code><\/p>\ncatch (Exception _ex)<\/code><\/p>\n{<\/code><\/p>\nLogger.Log($\"::: {DateTime.Now} Error: \" + _ex.Message);<\/code><\/p>\n}<\/code><\/p>\n <\/p>\n
return Mails;<\/code><\/p>\n}<\/code><\/p>\n}<\/code><\/p>\n}<\/code><\/p>\n <\/p>\n
As you can see from the code, the GetMail () method connects to a specific mailbox, searches the Inbox folder for messages from the sender “Zabbix”, returns them as a result of its work and deletes them from the mailbox. The body of the bot receives letters in the Mails variable and sends them to everyone interested in Telegram.<\/p>\n
Only the flight of thought and imagination decides what functionality to give the bot. In my case, the bot lets it in only with a password, logs all its activities, and can receive the ping command for a detailed analysis of the network state.<\/p>\n
The full version of the bot can be viewed on github: https:\/\/github.com\/ishmuratov\/ZabbixBot.<\/p>\n
<\/p>\n
![\"telegram](\"http:\/\/blog.oqtacore.com\/wp-content\/uploads\/2021\/01\/2021-01-12_23-35-47.png\")
<\/strong><\/p>\n