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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.");
}
/**
* Hooks are called too late, so this is done before hooks:
*
* Define NO_ONLINE if it looks like we're going to show an 404 error,
* unless the user explicitely wants these errors to show in the WOL.
*/
global $mybb;
if(THIS_SCRIPT == "misc.php"
&& $mybb->input['google_seo_error'] == "404")
{
if($mybb->settings['google_seo_404_wol_show'])
{
// Set the 404 error location
$location = 'misc.php?google_seo_error=404';
if($mybb->settings['google_seo_404_wol_show'] == 2)
{
// Include the URI for debugging purposes
$location .= '&uri='.urlencode($_SERVER['REQUEST_URI']);
}
$location = substr($location, 0, 150);
global $google_seo_location;
$google_seo_location = $location;
}
else
{
@define("NO_ONLINE", 1);
}
}
/* --- Hooks: --- */
// Set HTTP 404 status code, add widget to error pages:
$plugins->add_hook("error", "google_seo_404");
$plugins->add_hook("no_permission", "google_seo_404_no_permission");
// Custom 404 error page:
$plugins->add_hook("misc_start", "google_seo_404_page");
// WOL extension for custom page:
$plugins->add_hook("build_friendly_wol_location_end", "google_seo_404_wol");
/* --- 404 helpers: --- */
/**
* Sort function: longest strings first, patterns last
*/
function google_seo_404_status_cmp($a, $b)
{
return strlen($b) - strlen($a);
}
/**
* Parse the 404 status setting
*/
function google_seo_404_status($label)
{
global $settings;
$patterns = array('*' => '404 Not Found');
if(is_string($settings['google_seo_404_status']))
{
$lines = explode("\n", $settings['google_seo_404_status']);
foreach($lines as $line)
{
$fields = explode("=", $line);
if(count($fields) == 2)
{
$status = trim($fields[0]);
$values = explode(",", $fields[1]);
if(strpos($status, (int)$status.' ') === 0)
{
foreach($values as $value)
{
$value = trim($value);
if($value === $label)
{
return $status;
}
else if(strpos($value, '*') !== false)
{
$patterns[$value] = $status;
}
}
}
}
}
}
// Sort patterns by length.
uksort($patterns, 'google_seo_404_status_cmp');
// Find the first matching pattern
foreach($patterns as $pattern => $status)
{
$pattern = preg_quote($pattern, '#');
$pattern = str_replace('\\*', '.*', $pattern);
if(preg_match("#^{$pattern}\$#", $label))
{
return $status;
}
}
}
/* --- 404 error handling: --- */
/**
* Set the 404 header, add Google 404 widget, if enabled.
*
* @param string Error message, which may be modified.
*/
function google_seo_404(&$error)
{
global $mybb, $lang, $settings;
global $google_seo_404_label;
if($mybb->input['ajax'])
{
// don't mess with ajax
return;
}
// Reverse language lookup hack. Might fail for dynamic {1} elements.
// Thanks to Cayo / HTTP Status plugin for this idea.
$keys = array_keys((array)$lang, $error);
if(count($keys) > 0)
{
sort($keys); // try to be deterministic in case of dupes
$label = $keys[0];
// Most labels start with error_, shorten it.
if(strpos($label, "error_") === 0)
{
$label = substr($label, 6);
}
}
else if($google_seo_404_label)
{
$label = $google_seo_404_label;
}
else
{
$label = 'NULL';
}
if($label && $settings['google_seo_404_debug'])
{
$label = htmlspecialchars($label);
$error .= "<p>(Error label: '<b>{$label}</b>')</p>";
}
$status = google_seo_404_status($label);
if($status)
{
@header("HTTP/1.1 {$status}");
if($status[0] == '4' && $settings['google_seo_404_widget'])
{
$error .= $lang->sprintf($lang->googleseo_404_widget,
$settings['bburl']);
}
}
}
function google_seo_404_no_permission()
{
global $google_seo_404_label;
$google_seo_404_label = "no_permission";
}
/* --- Custom 404 error page --- */
/**
* Create a custom 404 error page for errors that occur outside of MyBB.
*
*/
function google_seo_404_page()
{
global $mybb, $lang;
if($mybb->input['google_seo_error'] == 404)
{
error($lang->googleseo_404_notfound);
}
}
/* --- WOL --- */
/**
* Extend WOL for users on the 404 page.
*
*/
function google_seo_404_wol(&$p)
{
global $lang, $user, $settings;
// Check if this user is on a 404 page.
if(strpos($p['user_activity']['location'], "misc.php?google_seo_error=404") === 0)
{
$p['user_activity']['activity'] = 'google_seo_404';
$location = $p['user_activity']['location'];
$p['location_name'] = $lang->sprintf($lang->googleseo_404_wol,
$location);
}
}
/* --- End of file. --- */
?>