<?php

    /**
     * Lightweight Akismet API interface using cURL.
     * Aspektas http://www.aspektas.com/ 2009, some rights reserved. Distribution governed by the 
     * Creative Commons Attribution-Share Alike 3.0 Unported license,
     * http://creativecommons.org/licenses/by-sa/3.0/.
     * This notice must remain intact. That is all.
     */
     
    class Akismet {
    
        private $blog;
        private $api_key;
        private $comment_fields; 
        
        function __construct($blog, $api_key) {
            if (!$this->is_valid_key($blog, $api_key)) throw new Exception("Invalid key.");
            else {
                $this->blog = $blog;
                $this->api_key = $api_key;
                $this->comment_fields['blog'] = $this->blog;
                $this->comment_fields['user_ip'] = $_SERVER['REMOTE_ADDR'];
                $this->comment_fields['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
            }
        }
        
        function is_valid_key($blog, $api_key) {
            $fields = array(
                "key" => $api_key,
                "blog" => $blog
            );
            $result = $this->send($fields, "verify-key");
            if (strpos($result, "invalid") !== false) return false;
            else return true;
        }
        
        function is_spam() {
            $result = $this->send($this->comment_fields);
            if (strpos($result, "true") !== false) return true;
            else return false;
        }
        
        function submit_spam() {
            $this->send($this->comment_fields, "submit-spam");
        }
        
        function submit_ham() {
            $this->send($this->comment_fields, "submit-ham");
        }
        
        function add_field($field, $value) {
            $this->comment_fields[$field] = $value;
        }
        
        function add_fields($array) { //e.g. add_fields($_SERVER)
            foreach ($array as $key => $value) $this->comment_field[$key] = $value;
        }
        
        private function send($fields, $method = "comment-check") {
            $curl = curl_init();
            $url = "http://" . ($method == "verify-key" ? "" : "{$this->api_key}.") . "rest.akismet.com/1.1/$method";
            
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            //curl_setopt($curl, CURLOPT_HEADER, true);
            curl_setopt($curl, CURLOPT_POST, true);
            curl_setopt($curl, CURLOPT_USERAGENT, "Aspektas/5 | Akismet/0.1");
            curl_setopt($curl, CURLOPT_POSTFIELDS, $fields);
            $result = curl_exec($curl);
            return $result;
        }
    }
?>