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<?php
/*
Plugin Name: Login Logo
Description: Drop a PNG file named <code>login-logo.png</code> into your <code>wp-content</code> directory. This simple plugin takes care of the rest, with zero configuration. Transparent backgrounds work best. Crop it tight, with a width of 312 pixels, for best results.
Version: 0.10.2
License: GPL
Plugin URI: https://txfx.net/wordpress-plugins/login-logo/
Author: Mark Jaquith
Author URI: https://coveredweb.com/
==========================================================================
Copyright (c) 2011-2022 Mark Jaquith (email: mark@jaquith.me)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
class CWS_Login_Logo_Plugin {
public static $instance;
const CUTOFF = 312;
public $logo_locations;
public $logo_location;
public $width = 0;
public $height = 0;
public $original_width;
public $original_height;
public $logo_size;
public $logo_file_exists;
public function __construct() {
self::$instance = $this;
add_action('login_head', array( $this, 'login_head' ));
}
public function init() {
global $blog_id;
$this->logo_locations = array();
if ( is_multisite() && function_exists('get_current_site') ) {
// First, see if there is one for this specific site (blog)
$this->logo_locations['site'] = array(
'path' => WP_CONTENT_DIR . '/login-logo-site-' . $blog_id . '.png',
'url' => $this->maybe_ssl(content_url('login-logo-site-' . $blog_id . '.png'))
);
// Next, we see if there is one for this specific network
$site = get_current_site(); // Site = Network? Ugh.
if ($site && isset($site->id)) {
$this->logo_locations['network'] = array(
'path' => WP_CONTENT_DIR . '/login-logo-network-' . $site->id . '.png',
'url' => $this->maybe_ssl(content_url('login-logo-network-' . $site->id . '.png'))
);
}
}
// Finally, we do a global lookup
$this->logo_locations['global'] = array(
'path' => WP_CONTENT_DIR . '/login-logo.png',
'url' => $this->maybe_ssl(content_url('login-logo.png'))
);
}
private function maybe_ssl($url) {
if ( is_ssl() ) {
$url = preg_replace('#^http://#', 'https://', $url);
}
return $url;
}
private function logo_file_exists() {
if ( !isset( $this->logo_file_exists ) ) {
foreach ( $this->logo_locations as $location ) {
if ( file_exists( $location['path'] ) ) {
$this->logo_file_exists = true;
$this->logo_location = $location;
break;
} else {
$this->logo_file_exists = false;
}
}
}
return !! $this->logo_file_exists;
}
private function get_location($what = '') {
if ($this->logo_file_exists()) {
if ('path' == $what) {
return $this->logo_location[$what];
} elseif ('url' == $what) {
return $this->logo_location[$what] . '?v=' . filemtime($this->logo_location['path']);
} else {
return $this->logo_location;
}
}
return false;
}
private function get_width() {
$this->get_logo_size();
return absint($this->width);
}
private function get_height() {
$this->get_logo_size();
return absint($this->height);
}
private function get_original_width() {
$this->get_logo_size();
return absint($this->original_width);
}
private function get_original_height() {
$this->get_logo_size();
return absint($this->original_height);
}
private function get_logo_size() {
if (!$this->logo_file_exists()) {
return false;
}
if (!$this->logo_size) {
if ($sizes = getimagesize($this->get_location('path'))) {
$this->logo_size = $sizes;
$this->width = $sizes[0];
$this->height = $sizes[1];
$this->original_height = $this->height;
$this->original_width = $this->width;
if ($this->width > self::CUTOFF) {
// Use CSS 3 scaling
$ratio = $this->height / $this->width;
$this->height = ceil($ratio * self::CUTOFF);
$this->width = self::CUTOFF;
}
} else {
$this->logo_file_exists = false;
}
}
return array( $this->width, $this->height );
}
private function css3($rule, $value) {
foreach (array( '', '-o-', '-webkit-', '-khtml-', '-moz-', '-ms-' ) as $prefix) {
echo $prefix . $rule . ': ' . $value . '; ';
}
}
public function login_headerurl() {
return esc_url(trailingslashit(get_bloginfo('url')));
}
public function login_headertitle() {
return esc_attr(get_bloginfo('name'));
}
public function login_head() {
$this->init();
if (!$this->logo_file_exists()) {
return;
}
add_filter('login_headerurl', array( $this, 'login_headerurl' ));
add_filter(
version_compare(get_bloginfo('version'), '5.2', '>=') ? 'login_headertext' : 'login_headertitle',
array( $this, 'login_headertitle' )
);
?>
<!-- Login Logo plugin for WordPress: https://txfx.net/wordpress-plugins/login-logo/ -->
<style>
.login h1 a {
background: url(<?php echo esc_url_raw($this->get_location('url')); ?>) no-repeat top center;
width: <?php echo self::CUTOFF; ?>px;
height: <?php echo $this->get_height(); ?>px;
margin-left: 8px;
padding-bottom: 16px;
<?php
if (self::CUTOFF < $this->get_original_width()) {
$this->css3('background-size', 'contain');
} else {
$this->css3('background-size', 'auto');
}
?>
}
</style>
<?php if (self::CUTOFF < $this->get_width()) { ?>
<!--[if lt IE 9]>
<style>
height: <?php echo $this->get_original_height() + 3; ?>px;
</style>
<![endif]-->
<?php
}
}
}
// Bootstrap
new CWS_Login_Logo_Plugin;