<?php
/**
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <gohr@cosmocode.de>
 */

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once(DOKU_PLUGIN.'action.php');

class action_plugin_akismet extends DokuWiki_Action_Plugin {

    /**
     * return some info
     */
    function getInfo(){
        return array(
            'author' => 'Andreas Gohr',
            'email'  => 'andi@splitbrain.org',
            'date'   => '2006-11-09',
            'name'   => 'Akismet Plugin',
            'desc'   => 'Use the Wordpress Akismet webservice to protect the Wiki against spam',
            'url'    => 'http://wiki:splitbrain.org/plugin:akismet',
        );
    }

    /**
     * register the eventhandlers
     */
    function register(&$controller){
        $controller->register_hook('ACTION_ACT_PREPROCESS',
                                   'BEFORE',
                                   $this,
                                   'handle_act_preprocess',
                                   array());
    }

    /**
     * Will intercept the 'save' action and check for Spam first.
     */
    function handle_act_preprocess(&$event, $param){
        if('save' != act_clean($event->data)) return; // nothing to do for us
        if(!$this->getConf('apikey')) return; // we need an API key

        // preprocess all available data
        global $ID;
        global $PRE;
        global $TEXT;
        global $SUF;
        global $INFO;

        $data = array();
        $data['blog']                 = DOKU_URL;
        $data['user_ip']              = $_SERVER['REMOTE_ADDR'];
        $data['user_agent']           = $_SERVER['HTTP_USER_AGENT'];
        $data['referrer']             = $_SERVER['HTTP_REFERER'];
        $data['permalink']            = wl($ID,'',true,'&');
        $data['comment_type']         = 'wikipageedit';

        $data['comment_author']       = $INFO['userinfo']['name'];
        $data['comment_author_email'] = $INFO['userinfo']['email'];
        $data['comment_content']      = con($PRE,$TEXT,$SUF,1);

        // check for spam an return if negative
        if(!$this->_checkForSpam($data)) return;

        // send mail if wanted
        if($this->getConf('notify')){
            $mail = "The Akismet plugin blocked the saving of the page ".$ID."\n\n";
            $mail .= $data['comment_content'];
            mail_send($this->getConf('notify'),'DokuWiki Akismet: blocked save',$mail);
        }

        // now block if configured
        if(!$this->getConf('dryrun')) $event->data = 'wordblock';
    }

    /**
     * Submit the data to the Akismet webservice and return the result
     */
    function _checkForSpam($data){
        $info = $this->getInfo();
        $http = new DokuHTTPClient();
        // The Aksimet guys ask for a verbose UserAgent:
        $http->agent = 'DokuWiki/'.getVersion().' | '.$info['name'].'/'.$info['date'];
        $http->timeout = 5;
        $resp = $http->post('http://'.$this->getConf('apikey').'.rest.akismet.com/1.1/comment-check',$data);

        if($resp == 'true') return true;
        return false;
    }

}