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<?php
/**
* This file is part of Google SEO plugin for MyBB.
* Copyright (C) 2008-2011 Andreas Klauer <Andreas.Klauer@metamorpher.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
// Disallow direct access to this file for security reasons
if(!defined("IN_MYBB"))
{
die("Direct initialization of this file is not allowed.<br /><br />
Please make sure IN_MYBB is defined.");
}
/* --- Globals: --- */
global $settings, $google_seo_nofollow, $google_seo_meta;
// Nofollow datetime
if($settings['google_seo_meta_nofollow'])
{
$google_seo_nofollow = (float)$settings['google_seo_meta_nofollow'];
if($google_seo_nofollow > 0)
{
$google_seo_nofollow = TIME_NOW - $google_seo_nofollow*24*60*60;
}
}
/* --- Hooks: --- */
// Generic Hooks
$plugins->add_hook("forumdisplay_end", "google_seo_meta_forum");
$plugins->add_hook("postbit", "google_seo_meta_thread");
$plugins->add_hook("member_profile_end", "google_seo_meta_user");
$plugins->add_hook("postbit_announcement", "google_seo_meta_announcement");
$plugins->add_hook("calendar_event_end", "google_seo_meta_event");
$plugins->add_hook("calendar_end", "google_seo_meta_calendar");
$plugins->add_hook("printthread_post", "google_seo_meta_printthread");
// Archive Hooks
if(defined("IN_ARCHIVE") && $settings['google_seo_meta_archive'])
{
$plugins->add_hook("archive_start", "google_seo_meta_archive_start");
$plugins->add_hook("archive_announcement_end", "google_seo_meta_archive");
$plugins->add_hook("archive_thread_post", "google_seo_meta_archive");
$plugins->add_hook("archive_forum_end", "google_seo_meta_archive");
}
/* --- Functions: --- */
/**
* Clean up a description and append it to google_seo_meta.
*
* @param string The unfiltered description that should be used.
*/
function google_seo_meta_description($description)
{
global $settings, $plugins, $google_seo_meta;
if($settings['google_seo_meta_length'] > 0)
{
$description = strip_tags($description);
$description = str_replace(" ", " ", $description);
$description = preg_replace("/\\[[^\\]]+\\]/u", "", $description);
$description = preg_replace("/\\s+/u", " ", $description);
$description = trim($description);
$description = my_substr($description, 0, $settings['google_seo_meta_length'], true);
$description = trim($description);
if($description)
{
$plugins->add_hook('pre_output_page', 'google_seo_meta_output');
$google_seo_meta = "<meta name=\"description\" content=\"{$description}\" />\n{$google_seo_meta}";
}
}
}
/**
* Append a canonical link to google_seo_meta.
*
* @param string The link that is canonical for this page.
*/
function google_seo_meta_canonical($link)
{
global $settings, $plugins, $google_seo_meta;
$plugins->add_hook('pre_output_page', 'google_seo_meta_output');
$google_seo_meta = "<link rel=\"canonical\" href=\"{$settings['bburl']}/$link\" />\n{$google_seo_meta}";
}
/**
* Initialize a page variable
*/
function google_seo_meta_page($page)
{
global $settings, $lang;
global $google_seo_page;
if($page > 1 && $settings['google_seo_meta_page'])
{
$google_seo_page = google_seo_expand(
$settings['google_seo_meta_page'],
array(
'page' => $lang->googleseo_meta_page,
'number' => (int)$page,
)
);
}
}
/**
* Make a page noindex.
*/
function google_seo_meta_noindex($fid)
{
global $settings, $plugins, $google_seo_meta;
if(strpos("0,{$settings['google_seo_meta_noindex_fids']},", ",{$fid},"))
{
$plugins->add_hook('pre_output_page', 'google_seo_meta_output');
$google_seo_meta = "<meta name=\"robots\" content=\"noindex\" />\n{$google_seo_meta}";
}
}
/**
* Make links in a string nofollow.
*/
function google_seo_meta_nofollow($text)
{
if(is_string($text))
{
$text = str_replace('<a ',
'<a rel="nofollow" ',
$text);
}
return $text;
}
/**
* Generate meta tags for a forum.
*
* @param int Forum-ID
*/
function google_seo_meta_forum()
{
global $settings, $foruminfo, $fid, $page;
// Canonical:
if($settings['google_seo_meta_canonical'] && $fid > 0)
{
if($fid == $settings['google_seo_tweak_index_fid'])
{
$link = "";
if($page > 1)
{
$link = "?page={$page}";
}
}
else if($page > 1)
{
$link = get_forum_link($fid, $page);
}
else
{
$link = get_forum_link($fid);
}
google_seo_meta_canonical($link);
}
// Description:
if($foruminfo)
{
google_seo_meta_description($foruminfo['description']);
}
// Page:
google_seo_meta_page((int)$page);
// Noindex:
google_seo_meta_noindex($fid);
}
/**
* Generate meta tags for a thread.
*
* @param post
*/
function google_seo_meta_thread(&$post)
{
global $settings, $lang, $plugins, $tid, $page, $thread;
global $google_seo_page, $google_seo_nofollow;
// We're only interested in the first post of a page.
$plugins->remove_hook("postbit", "google_seo_meta_thread");
// Canonical:
if($settings['google_seo_meta_canonical'] && $tid > 0)
{
if($page > 1)
{
google_seo_meta_canonical(get_thread_link($tid, $page));
}
else
{
google_seo_meta_canonical(get_thread_link($tid));
}
}
// Description:
if($post)
{
google_seo_meta_description($post['message']);
}
// Page:
google_seo_meta_page((int)$page);
// Noindex:
google_seo_meta_noindex($post['fid']);
// Nofollow:
if($google_seo_nofollow && $thread['lastpost'] > $google_seo_nofollow)
{
// We need to grab the remaining posts as well.
$plugins->add_hook("postbit", "google_seo_meta_posts");
if(defined("IN_ARCHIVE") && $settings['google_seo_meta_archive'])
{
$plugins->add_hook("archive_thread_post", "google_seo_meta_posts");
}
google_seo_meta_posts($post);
}
}
/**
* Nofollow links in posts.
*/
function google_seo_meta_posts(&$mypost)
{
global $post;
global $google_seo_nofollow;
// Archive Post hook doesn't supply us with the post so we have to cheat.
if(defined("IN_ARCHIVE") && !$mypost && $post)
{
$mypost = &$post;
}
if($mypost['dateline'] > $google_seo_nofollow)
{
$mypost['message'] = google_seo_meta_nofollow($mypost['message']);
$mypost['button_www'] = google_seo_meta_nofollow($mypost['button_www']);
$mypost['signature'] = google_seo_meta_nofollow($mypost['signature']);
}
}
/**
* Meta for printthread
*/
function google_seo_meta_printthread()
{
global $plugins, $postrow, $thread;
global $google_seo_nofollow;
$plugins->remove_hook("printthread_post", "google_seo_meta_printthread");
google_seo_meta_thread($postrow);
// Nofollow:
if($google_seo_nofollow && $thread['lastpost'] > $google_seo_nofollow)
{
$plugins->add_hook("printthread_post", "google_seo_meta_printthread_post");
// google_seo_meta_posts already called by google_seo_meta_thread()
}
}
function google_seo_meta_printthread_post()
{
global $postrow;
google_seo_meta_posts($postrow);
}
/**
* Generate meta tags for a user.
*
* @param int User-ID
*/
function google_seo_meta_user()
{
global $settings, $uid, $memprofile, $signature, $website;
global $google_seo_nofollow;
// Canonical:
if($settings['google_seo_meta_canonical'] && $uid > 0)
{
google_seo_meta_canonical(get_profile_link($uid));
}
// Nofollow:
if($memprofile['regdate'] > $google_seo_nofollow)
{
$signature = google_seo_meta_nofollow($signature);
$website = google_seo_meta_nofollow($website);
}
}
/**
* Generate meta tags for an announcement.
*
* @param int Announcement-ID
*/
function google_seo_meta_announcement($post)
{
global $settings, $aid;
// Canonical:
if($settings['google_seo_meta_canonical'] && $aid > 0)
{
google_seo_meta_canonical(get_announcement_link($aid));
}
// Description:
if($post)
{
google_seo_meta_description($post['message']);
}
}
/**
* Generate meta tags for an event.
*
* @param int Event-ID
*/
function google_seo_meta_event($eid)
{
global $settings, $event;
// Canonical:
if($settings['google_seo_meta_canonical'] && $event['eid'] > 0)
{
google_seo_meta_canonical(get_event_link($event['eid']));
}
// Description:
google_seo_meta_description($event['description']);
}
/**
* Generate meta tags for a calendar
*
* @param int Calendar-ID
*/
function google_seo_meta_calendar()
{
global $settings, $calendar;
// Canonical:
if($settings['google_seo_meta_canonical'] && $calendar['cid'] > 0)
{
google_seo_meta_canonical(get_calendar_link($calendar['cid']));
}
// Description:
// not implemented yet
}
/* --- Lite (Archive) Mode --- */
/**
* Build description and canonical for the archive pages.
*
*/
function google_seo_meta_archive()
{
global $plugins, $action;
switch($action)
{
case "announcement":
global $announcement, $aid;
$aid = $announcement['aid'];
google_seo_meta_announcement($announcement);
break;
case "thread":
global $post, $tid;
$plugins->remove_hook("archive_thread_post",
"google_seo_meta_archive");
$tid = $post['tid'];
google_seo_meta_thread($post);
break;
case "forum":
global $forum, $foruminfo, $fid;
$fid = $forum['fid'];
$foruminfo = $forum;
google_seo_meta_forum();
break;
}
}
/**
* Catch the hard coded output using PHP output buffer control.
* This hack is necessary because MyBB's Lite (Archive) Mode is hard coded.
* Thanks to Michael S. for this idea.
*/
function google_seo_meta_archive_start()
{
ob_start('google_seo_meta_output');
}
/**
* Add the tags to the output.
*/
function google_seo_meta_output($string)
{
global $google_seo_meta;
if($google_seo_meta)
{
$pos = strpos($string, '</head>');
if($pos)
{
// Insert google_seo_meta at pos.
$string = substr_replace($string, $google_seo_meta, $pos, 0);
// Just in case.
$google_seo_meta = '';
}
}
return $string;
}
/* --- End of file. --- */
?>