<?php declare(strict_types=1);
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Monolog\Handler;
use RuntimeException;
use Monolog\Level;
use Monolog\Utils;
use Monolog\LogRecord;
/**
* Handler sends logs to Telegram using Telegram Bot API.
*
* How to use:
* 1) Create a Telegram bot with https://telegram.me/BotFather;
* 2) Create a Telegram channel or a group where logs will be recorded;
* 3) Add the created bot from step 1 to the created channel/group from step 2.
*
* In order to create an instance of TelegramBotHandler use
* 1. The Telegram bot API key from step 1
* 2. The channel name with the `@` prefix if you created a public channel (e.g. `@my_public_channel`),
* or the channel ID with the `-100` prefix if you created a private channel (e.g. `-1001234567890`),
* or the group ID from step 2 (e.g. `-1234567890`).
*
* @link https://core.telegram.org/bots/api
*
* @author Mazur Alexandr <alexandrmazur96@gmail.com>
*/
class TelegramBotHandler extends AbstractProcessingHandler
{
private const BOT_API = 'https://api.telegram.org/bot';
/**
* The available values of parseMode according to the Telegram api documentation
*/
private const AVAILABLE_PARSE_MODES = [
'HTML',
'MarkdownV2',
'Markdown', // legacy mode without underline and strikethrough, use MarkdownV2 instead
];
/**
* The maximum number of characters allowed in a message according to the Telegram api documentation
*/
private const MAX_MESSAGE_LENGTH = 4096;
/**
* Telegram bot access token provided by BotFather.
* Create telegram bot with https://telegram.me/BotFather and use access token from it.
*/
private string $apiKey;
/**
* Telegram channel name.
* Since to start with '@' symbol as prefix.
*/
private string $channel;
/**
* The kind of formatting that is used for the message.
* See available options at https://core.telegram.org/bots/api#formatting-options
* or in AVAILABLE_PARSE_MODES
*/
private string|null $parseMode;
/**
* Disables link previews for links in the message.
*/
private bool|null $disableWebPagePreview;
/**
* Sends the message silently. Users will receive a notification with no sound.
*/
private bool|null $disableNotification;
/**
* True - split a message longer than MAX_MESSAGE_LENGTH into parts and send in multiple messages.
* False - truncates a message that is too long.
*/
private bool $splitLongMessages;
/**
* Adds 1-second delay between sending a split message (according to Telegram API to avoid 429 Too Many Requests).
*/
private bool $delayBetweenMessages;
/**
* Telegram message thread id, unique identifier for the target message thread (topic) of the forum; for forum supergroups only
* See how to get the `message_thread_id` https://stackoverflow.com/a/75178418
*/
private int|null $topic;
/**
* @param string $apiKey Telegram bot access token provided by BotFather
* @param string $channel Telegram channel name
* @param bool $splitLongMessages Split a message longer than MAX_MESSAGE_LENGTH into parts and send in multiple messages
* @param bool $delayBetweenMessages Adds delay between sending a split message according to Telegram API
* @param int $topic Telegram message thread id, unique identifier for the target message thread (topic) of the forum
* @throws MissingExtensionException If the curl extension is missing
*/
public function __construct(
string $apiKey,
string $channel,
$level = Level::Debug,
bool $bubble = true,
?string $parseMode = null,
?bool $disableWebPagePreview = null,
?bool $disableNotification = null,
bool $splitLongMessages = false,
bool $delayBetweenMessages = false,
?int $topic = null
) {
if (!\extension_loaded('curl')) {
throw new MissingExtensionException('The curl extension is needed to use the TelegramBotHandler');
}
parent::__construct($level, $bubble);
$this->apiKey = $apiKey;
$this->channel = $channel;
$this->setParseMode($parseMode);
$this->disableWebPagePreview($disableWebPagePreview);
$this->disableNotification($disableNotification);
$this->splitLongMessages($splitLongMessages);
$this->delayBetweenMessages($delayBetweenMessages);
$this->setTopic($topic);
}
/**
* @return $this
*/
public function setParseMode(string|null $parseMode = null): self
{
if ($parseMode !== null && !\in_array($parseMode, self::AVAILABLE_PARSE_MODES, true)) {
throw new \InvalidArgumentException('Unknown parseMode, use one of these: ' . implode(', ', self::AVAILABLE_PARSE_MODES) . '.');
}
$this->parseMode = $parseMode;
return $this;
}
/**
* @return $this
*/
public function disableWebPagePreview(bool|null $disableWebPagePreview = null): self
{
$this->disableWebPagePreview = $disableWebPagePreview;
return $this;
}
/**
* @return $this
*/
public function disableNotification(bool|null $disableNotification = null): self
{
$this->disableNotification = $disableNotification;
return $this;
}
/**
* True - split a message longer than MAX_MESSAGE_LENGTH into parts and send in multiple messages.
* False - truncates a message that is too long.
*
* @return $this
*/
public function splitLongMessages(bool $splitLongMessages = false): self
{
$this->splitLongMessages = $splitLongMessages;
return $this;
}
/**
* Adds 1-second delay between sending a split message (according to Telegram API to avoid 429 Too Many Requests).
*
* @return $this
*/
public function delayBetweenMessages(bool $delayBetweenMessages = false): self
{
$this->delayBetweenMessages = $delayBetweenMessages;
return $this;
}
/**
* @return $this
*/
public function setTopic(?int $topic = null): self
{
$this->topic = $topic;
return $this;
}
/**
* @inheritDoc
*/
public function handleBatch(array $records): void
{
$messages = [];
foreach ($records as $record) {
if (!$this->isHandling($record)) {
continue;
}
if (\count($this->processors) > 0) {
$record = $this->processRecord($record);
}
$messages[] = $record;
}
if (\count($messages) > 0) {
$this->send((string) $this->getFormatter()->formatBatch($messages));
}
}
/**
* @inheritDoc
*/
protected function write(LogRecord $record): void
{
$this->send($record->formatted);
}
/**
* Send request to @link https://api.telegram.org/bot on SendMessage action.
*/
protected function send(string $message): void
{
$messages = $this->handleMessageLength($message);
foreach ($messages as $key => $msg) {
if ($this->delayBetweenMessages && $key > 0) {
sleep(1);
}
$this->sendCurl($msg);
}
}
protected function sendCurl(string $message): void
{
$ch = curl_init();
$url = self::BOT_API . $this->apiKey . '/SendMessage';
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
$params = [
'text' => $message,
'chat_id' => $this->channel,
'parse_mode' => $this->parseMode,
'disable_web_page_preview' => $this->disableWebPagePreview,
'disable_notification' => $this->disableNotification,
];
if ($this->topic !== null) {
$params['message_thread_id'] = $this->topic;
}
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
$result = Curl\Util::execute($ch);
if (!\is_string($result)) {
throw new RuntimeException('Telegram API error. Description: No response');
}
$result = json_decode($result, true);
if ($result['ok'] === false) {
throw new RuntimeException('Telegram API error. Description: ' . $result['description']);
}
}
/**
* Handle a message that is too long: truncates or splits into several
* @return string[]
*/
private function handleMessageLength(string $message): array
{
$truncatedMarker = ' (...truncated)';
if (!$this->splitLongMessages && \strlen($message) > self::MAX_MESSAGE_LENGTH) {
return [Utils::substr($message, 0, self::MAX_MESSAGE_LENGTH - \strlen($truncatedMarker)) . $truncatedMarker];
}
return str_split($message, self::MAX_MESSAGE_LENGTH);
}
}
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