RasaNLU middleware for BotMan

RasaNLU.php

<?php

namespace App\BotMan\Middleware;

use Mpociot\BotMan\Message;
use Mpociot\BotMan\Http\Curl;
use Mpociot\BotMan\Interfaces\HttpInterface;
use Mpociot\BotMan\Interfaces\DriverInterface;
use Mpociot\BotMan\Interfaces\MiddlewareInterface;

class RasaNLU implements MiddlewareInterface
{
    /** @var string */
    protected $token;

    /** @var string */
    protected $apiUrl = 'http://localhost:5000/parse?q=';

    /** @var bool */
    protected $listenForAction = false;

    /**
     * Restrict the middleware to only listen for API.ai actions.
     * @param  bool $listen
     * @return $this
     */
    public function listenForAction($listen = true)
    {
        $this->listenForAction = $listen;

        return $this;
    }

    /**
     * Handle / modify the message.
     *
     * @param Message $message
     * @param DriverInterface $driver
     */
    public function handle(Message &$message, DriverInterface $driver)
    {
        $url = $this->apiUrl . urlencode($message->getMessage());

        $response = json_decode(file_get_contents($url));
        $reply = isset($response->result->speech) ? $response->result->speech : '';
        $action = isset($response->result->action) ? $response->result->action : '';
        $intent = isset($response->result->metadata->intentName) ? $response->result->metadata->intentName : '';
        $parameters = isset($response->result->parameters) ? (array) $response->result->parameters : [];

        $message->addExtras('apiReply', $reply);
        $message->addExtras('apiAction', $intent);
        $message->addExtras('apiIntent', $intent);
        $message->addExtras('apiParameters', $parameters);
    }

    /**
     * @param Message $message
     * @param string $test
     * @param bool $regexMatched
     * @return bool
     * @internal param string $test
     */
    public function isMessageMatching(Message $message, $test, $regexMatched)
    {
        if ($this->listenForAction) {
            $parameters = collect($message->getExtras()['apiParameters']);
            return $message->getExtras()['apiAction'] === $test && $parameters->has('type') && $parameters->has('size');
        }

        return true;
    }
}