serverguard-slack-proxy.php

<?php declare(strict_types=1);
/**
 * @author hollodotme
 * This script receives a POST request from www.serverguard24.de 
 * and transforms it to a POST request to a slack webhook URL with JSON payload
 * 1. Configure a slack webhook URL and paste it here in line 75
 * 2. Put this script on a server an make it accessible via http
 * 3. Add a contact at serverguard24.de and paste the URL to this script in HTTP Push URL field
 * 4. Add the contact to your server guard checks
 * NOTE: Script is written for PHP >= 7.1
 */

namespace YourVendor\YourProject;

header('Conent-Type: text/plain; charset=utf-8', true, 200);

if ($_SERVER['REQUEST_METHOD'] !== 'POST') die('Nope');

final class PostRequest 
{
	private const SERVER_NAME = 'server_name';
	private const SERVER_ADDRESS = 'server_address';
	private const SERVICE_NAME = 'service_name';
	private const SERVICE_SHORTNAME = 'service_shortname';
	private const CHECK_RESULT = 'check_result';
	private const CHECK_OUTPUT = 'check_output';
	private const NOTIFICATION_TIME = 'notification_time';
	
	/** @var array */
	private $data;
	
	public function __construct( array $data )
	{
		$this->data = $data;
	}
	
	public function getServerName() : string
	{
		return (string)$this->data[self::SERVER_NAME];
	}
	
	public function getServerAddress() : string
	{
		return (string)$this->data[self::SERVER_ADDRESS];
	}
	
	public function getServiceName() : string
	{
		return (string)$this->data[self::SERVICE_NAME];
	}
	
	public function getServiceShortname() : string
	{
		return (string)$this->data[self::SERVICE_SHORTNAME];
	}
	
	public function getCheckResult() : string
	{
		return (string)$this->data[self::CHECK_RESULT];
	}
	
	public function getCheckOutput() : string
	{
		return (string)$this->data[self::CHECK_OUTPUT];
	}
	
	public function getNotificationTime() : string
	{
		return (string)$this->data[self::NOTIFICATION_TIME];
	}
}

final class SlackPusher
{
	private const WEBHOOK_URL = '<YOUR SLACK WEBHOOK URL HERE>';
	
	/** @var PostRequest */
	private $request;
	
	public function __construct(PostRequest $request)
	{
		$this->request = $request;
	}
	
	public function pushMessage() : void
	{
		$payload = $this->buildPayload();
		
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, self::WEBHOOK_URL);
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_POSTFIELDS, ['payload' => $payload]);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		
		$result    = curl_exec($ch);
		$curlInfo  = curl_getinfo($ch);
		$curlError = curl_error($ch);
		
		curl_close($ch);
	}
	
	private function buildPayload() : string
	{
		$payload = [
			'attachments' => [
				[
					"fallback" => "Server-Check für {$this->request->getServerName()} - {$this->request->getServiceName()}",
					"pretext" => "Server-Check für {$this->request->getServerName()} - {$this->request->getServiceName()}",
					"color" => ($this->request->getCheckResult() == "OK") ? "#249c1e" : "#d60a0a",
					"fields" => [
						[
							"title" => $this->request->getCheckResult(),
							"value" => $this->request->getCheckOutput() . " - " . $this->request->getNotificationTime(),
							"short" => false,
						],
					],
				],
			],
		];
		
		return json_encode($payload, JSON_PRETTY_PRINT);
	}
}

$request = new PostRequest($_POST);
$slackPusher = new SlackPusher($request);

$slackPusher->pushMessage();

die('OK');