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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE extension SYSTEM "ext-1.0.dtd">

<!--
/**
 * ChatLite: Adds a javascript chat to the forum.
 * Please note the licence DOES NOT apply to prototype's framework supplied with this extension. 
 *
 * @author Neck - http://www.eikylon.net
 * @license Creative Commons Attribution 3.0 Unported - http://creativecommons.org/licenses/by/3.0/
 * @package ek_chatlite 
 */
-->

<extension engine="1.0">
    <id>ek_chatlite</id>
    <title>ChatLite</title>
    <version>0.5.1</version>
    <description>Adds a javascript chat to the forum index.</description>
    <author>Neck - http://www.eikylon.net</author>
    <minversion>1.3</minversion>
    <maxtestedon>1.3.2</maxtestedon>

    <install><![CDATA[

// check the PHP version
if(version_compare(PHP_VERSION, '5.2.1') === -1) {
    $notices[] = '<strong>ERROR !</strong> PHP 5.2.1 or superior required ('.PHP_VERSION.' found). This extension cannot be run on your server, please uninstall it.';
}
// check write access on some files
if(!is_writable($ext_info['path'].'/data/chat.dat') || !is_writable($ext_info['path'].'/data/.htaccess')) {
    $notices[] = '<strong>WARNING !</strong> Write access needed. Please give php the permission to write in <em>ek_chatlite/data/chat.dat</em> and <em>ek_chatlite/data/.htaccess</em> before running the chat.';
}

    ]]></install>

    <hooks>
        <hook id="hd_head" priority="4"><![CDATA[

// add javascript and style files on the Index

// The following line is commented out to add the chatbox to every page (including admin pages). Uncomment it (and the ending bracket) to put it back to only the index page
// if(FORUM_PAGE === 'index') {
if(!$forum_user['is_guest']) { // this will remove the chat for users that aren't logged in
    if($forum_user['g_id'] != $forum_config['o_default_user_group']) { // this removes the chat for the default group, but leaves it for every other group
        $forum_head['prototypejs'] = '<script type="text/javascript" src="'.$ext_info['url'].'/media/js/prototype.js"></script>';
        $forum_head['ek_chatlitejs'] = '<script type="text/javascript" src="'.$ext_info['url'].'/media/js/chat.js?logged='.(($forum_user['is_guest']) ? 0 :(($forum_user['is_admmod']) ? 2 : 1)).'&baseUri='.$base_url.'/&extUri='.$ext_info['url'].'/"></script>';

        if (file_exists($ext_info['path'].'/media/js/lang/'.$forum_user['language'].'.js')) {
            $forum_head['ek_chatlitelangjs'] = '<script type="text/javascript" src="'.$ext_info['url'].'/media/js/lang/'.$forum_user['language'].'.js"></script>';
        } else {
            $forum_head['ek_chatlitelangjs'] = '<script type="text/javascript" src="'.$ext_info['url'].'/media/js/lang/English.js"></script>';
        }

        $ek_chatlite_css = (file_exists($ext_info['path'].'/media/css/'.$forum_user['style'].'.css')) ? $forum_user['style'] : 'default';
        $forum_head['style_ek_chatlite'] = '<link rel="stylesheet" type="text/css" media="screen" href="'.$ext_info['url'].'/media/css/'.$ek_chatlite_css.'.css" />';
    } // comment out this bracket if you remove the default group portion above
} // comment out this bracket if you remove the guest (users not logged in) portion above
// } // removed to add chat to every page
        ]]></hook>
        
        <hook id="mi_new_action"><![CDATA[
        

if ($action == 'ek_chatlite') {
    // the file we work on
    $chatFile = $ext_info['path'].'/data/chat.dat';

    $do = (isset($_POST['do'])) ? $_POST['do'] : null;
    if($do === 'post') {
        date_default_timezone_set('UTC');
        $message = (isset($_POST['message'])) ? forum_trim($_POST['message']) : null;
    
        // check for guests or empty messages
        if($forum_user['is_guest'] == true) {
            header('HTTP/1.x 401 Unauthorized');
            exit();
        } else if (empty($message)) {
            header('HTTP/1.x 404 Not Found');
            exit();
        } else {
            // read chat's content
            $content = file_get_contents($chatFile);
            $content = (empty($content)) ? array() : json_decode($content);

            // prepare values
            $user = htmlspecialchars($forum_user['username']);
            $message = str_replace("\n", '<br />', htmlspecialchars($message));

            // check double message
            $last = end($content);
            if(!empty($last) && $last[1]===$user && $last[3]===$message) {
                header('HTTP/1.x 403 Forbidden');
                exit();
            }

            // add the new message
            $content[] = array(
                md5(uniqid(rand(), true)),
                $user,
                date('r'),
                $message
            );

            // remove if there's more than 50 messages
            while(count($content) >= 50) {
                array_shift($content);
            }

            // encode and write
            $content = json_encode($content);
            file_put_contents($chatFile, $content);
            // push the checksum
            $check = md5($content);
            $htaccess = file_get_contents($ext_info['path'].'/data/.htaccess');
            $htaccess = preg_replace('`X-json "\\\"\w{32}\\\""`', 'X-json "\"'.$check.'\""', $htaccess);
            file_put_contents($ext_info['path'].'/data/.htaccess', $htaccess);
        }
    } else if ($do === 'del') {
        // admins/mods only
        if($forum_user['is_admmod'] != true) {
            header('HTTP/1.x 401 Unauthorized');
            exit();
        }

        // get and validate message id
        $msgId = (isset($_POST['msgId'])) ? $_POST['msgId'] : null;
        if(preg_match('`\w{32}`A', $msgId) == 0) {
            header('HTTP/1.x 404 Not Found');
            exit();
        }

        // get content, seek for the message and delete it
        $found = false;
        $content = file_get_contents($chatFile);
        $content = (empty($content)) ? array() : json_decode($content);
        foreach($content as $i=>$msg) {
            if($msg[0] === $msgId) {
                array_splice($content, $i, 1);
                $found = true;
                break;
            }
        }

        // return new content or an error
        if($found) {
            // encode and write
            $content = json_encode($content);
            file_put_contents($chatFile, $content);
            // push the checksum
            $check = md5($content);
            $htaccess = file_get_contents($ext_info['path'].'/data/.htaccess');
            $htaccess = preg_replace('`X-json "\\\"\w{32}\\\""`', 'X-json "\"'.$check.'\""', $htaccess);
            file_put_contents($ext_info['path'].'/data/.htaccess', $htaccess);
            
        } else {
            header('HTTP/1.x 404 Not Found');
            exit();
        }
    } else {
        $content = file_get_contents($ext_info['path'].'/data/chat.dat');
        $check = md5($content);
    }

    // return chat content
    header('X-json: "'.$check.'"');
    echo $content;
    exit();
}

        ]]></hook>

        <hook id="co_modify_url_scheme"><![CDATA[

// disable token validation for chat submit
if(get_current_url() === $base_url.'/misc.php?action=ek_chatlite') {
    $_POST['csrf_token'] = generate_form_token($base_url.'/misc.php?action=ek_chatlite');
}
        ]]></hook>
    </hooks>
</extension>