simple Symfony 2.8 service integrating BlogSpam.net free spam filter API

BlogSpam.php

<?php
/**
 * Description of BlogSpam.net, Detection for Blog & Forum SPAM free API (v2.0)
 * @see https://blogspam.net/api/2.0/
 * @note The BlogsSapm.net API supports only HTTP queries.
 *
 * @version 1.0.2
 *
 * @requires Buzz HTTP library. https://github.com/sensiolabs/SensioBuzzBundle
 * and cUrl (php5-curl), etc.
 *
 * @author Mikel Fernández <mikel.fernandez (at) owasys.com>
 * @copy (C) 2017 Owasys (https://www.owasys.com)
 * @license MIT
 */
namespace MyApp\MyBundleBundle\Services;

use Symfony\Component\DependencyInjection\ContainerInterface as Container;
use Symfony\Component\HttpFoundation\Request as Request;

/**
 * BlogSpam class
 */
class BlogSpam {
   
   /// BlogSpam Account: the URL of *our* site

   /**
    * URL of the action to test a comment for spam
    * @see https://blogspam.net/api/2.0/testComment.html
    */
   const TEST_COMMENT_URL = "http://test.blogspam.net:9999/";

   /**
    * URL of the action to train the spam rejection plugins
    * @see https://blogspam.net/api/2.0/classify.html
    */
   const RECLASSIFY_COMMENT_URL = "http://test.blogspam.net:9999/classify";

   private $logger;
   private $container;
   private $enabled;

   public function __construct($logger, Container $container, $useSpamFilter = TRUE) {
      $this->logger = $logger;
      $this->container = $container;
      $this->enabled = $useSpamFilter;
   }

   /**
    * Composes a JSON-encoded string with a valid BlogSpam.net API request
    * for both testComment and classifyComment actions
    * @param Request $request
    * @param string $train
    * @return string
    */
   private function composeBlogSpamRequest(Request $request, $train = null) {
      $toBeSent = array(
          'site' => $request->getSchemeAndHttpHost(),
          'comment' => $request->request->get('message'),
          'email' => $request->request->get('email'),
          'name' => $request->request->get('name'),
          'agent' => $request->server->get('HTTP_USER_AGENT'),
          'ip' => $request->getClientIp()
      );
      if ($train) { // composing request for reclassify action
         if ($train === 'spam' || $train === 'ok') {
            $toBeSent['train'] = $train;
         }
      }
      $this->logger->debug('BlogSpam.net service request:'.json_encode($toBeSent));
      return json_encode($toBeSent);
   }

   /**
    * Test comment or contact request form spam with BlogSpam.net API before processing a form
    * @param Request $request
    * @return
    */
   private function testComment(Request $request) {
      $buzz = $this->container->get('buzz');
      $headers = ['Content-Type', 'application/json'];
      $response = $buzz->post(
              BlogSpam::TEST_COMMENT_URL,
              $headers,
              $this->composeBlogSpamRequest($request)
      );
      return json_decode($response->getContent());
   }

   /**
    * Test comment or contact request form spam with BlogSpam.net API before processing a form
    * Log the failed attempts in standard Symfony log
    * @param Request $request
    * @return boolean
    */
   public function isSpam(Request $request) {
      $clientIp = $request->getClientIp();
      //$this->logger->debug('before check: '.$request);
      if ($this->enabled) {
         $resp = $this->testComment($request);
         if ($resp && $resp->result) {
            $this->logger->info('BlogSpam.net service : '.json_encode($resp).' :: client IP ' . $clientIp . ' host ' . $request->server->get('HTTP_HOST') . ' :: UA ' . $request->server->get('HTTP_USER_AGENT') . ' :: lang: ' . $request->server->get('HTTP_ACCEPT_LANGUAGE'));
            return ($resp->result === 'SPAM');
         }
         else {
            $this->logger->error('BlogSpam.net service Connection ERROR :: client IP ' . $clientIp . ' :: host ' . $request->server->get('HTTP_HOST') . ' :: UA ' . $request->server->get('HTTP_USER_AGENT') . ' :: lang: ' . $request->server->get('HTTP_ACCEPT_LANGUAGE'));
            return false; //we do not know whether the message is spam
         }
      }
//      else {
//         $this->logger->warn('BlogSpam.net service DISABLED :: client IP ' . $clientIp . ' :: host ' . $request->server->get('HTTP_HOST') . ' :: UA ' . $request->server->get('HTTP_USER_AGENT') . ' :: lang: ' . $request->server->get('HTTP_ACCEPT_LANGUAGE'));
//      }
      return false;
   }

}