Bot Framework

framework.php

<?php
header('Content-Type: application/json');

class Bot {
    const xrayUrl = ''; // host your own XRay!
    const logfile = 'log.txt';

    const names = [
      // add names for your bot here, so it can ignore itself
      // IMPORTANT! because it will loop and flood if you're not careful
    ];

    protected $message;
    protected $http_code;
    protected $error;

    public function __construct()
    {
        $this->message = json_decode(file_get_contents("php://input"));
    }

    public function respond($message, $ignoreSelf = true)
    {
        if($ignoreSelf) $this->ignoreSelf();

        if(is_array($message)) {
            $message = $message[mt_rand(0, count($message) - 1)];
        }

        echo json_encode([
          'content' => substr($message,0,255),
        ]);
    }

    public function message()
    {
        return $this->message->content;
    }

    public function getMatch($number = 0)
    {
        return isset($this->message->match[$number]) ? $this->message->match[$number] : null;
    }

    public function ignoreSelf()
    {
        if (in_array($this->message->author->uid, self::names)) exit();
    }

    public function lookup($url)
    {
        return json_decode($this->get(self::xrayUrl . urlencode($url)));
    }

    public function last_http_code()
    {
        return $this->http_code;
    }

    public function last_error()
    {
        return $this->error;
    }

    public function get($url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        $body = curl_exec($ch);
        $this->http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if(!$body) {
            $this->error = curl_error($ch);
        }

        curl_close($ch);

        return $body;
    }

    public function post($url, $fields, $bearer = null)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        if ($bearer) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, ['Authorization: Bearer '.$bearer]);
        }

        $body = http_build_query($fields);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $body);

        $resp = curl_exec($ch);
        $this->http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if(!$resp) {
            $this->error = curl_error($ch);
        }

        curl_close($ch);

        return $resp;
    }

    public function logMessage()
    {
        $log = json_encode([$this->message], JSON_PRETTY_PRINT);

        file_put_contents(self::logfile, strftime('%T')."\n\n".$log."\n\n".$this->message->response_url);
    }
}

$bot = new Bot;