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update-notifier.php
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update-notifier.php
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<?php
/**************************************************************
* *
* Provides a notification to the user everytime *
* your WordPress theme is updated *
* *
* by Joao Araujo http://themeforest.net/user/unisphere *
* Twitter: http://twitter.com/unispheredesign *
* *
**************************************************************/
// Constants for the theme name, folder and remote XML url
define( 'NOTIFIER_THEME_NAME', 'Touchfolio' ); // The theme name
define( 'NOTIFIER_THEME_FOLDER_NAME', 'touchfolio' ); // The theme folder name
define( 'NOTIFIER_XML_FILE', 'http://dimsemenov.com/themes/touchfolio/notifier.xml' ); // The remote notifier XML file containing the latest version of the theme and changelog
define( 'NOTIFIER_CACHE_INTERVAL', 30 ); // The time interval for the remote XML cache in the database (21600 seconds = 6 hours)
// Adds an update notification to the WordPress Dashboard menu
function update_notifier_menu() {
if (function_exists('simplexml_load_string')) { // Stop if simplexml_load_string funtion isn't available
$xml = get_latest_theme_version(NOTIFIER_CACHE_INTERVAL); // Get the latest remote XML file on our server
$theme_data = wp_get_theme(); // Read theme current version from the style.css
if( (float)$xml->latest > (float)$theme_data->Version) { // Compare current theme version with the remote XML version
add_dashboard_page( NOTIFIER_THEME_NAME . ' Theme Updates', NOTIFIER_THEME_NAME . ' <span class="update-plugins count-1"><span class="update-count">New Updates</span></span>', 'administrator', 'theme-update-notifier', 'update_notifier');
}
}
}
add_action('admin_menu', 'update_notifier_menu');
// Adds an update notification to the WordPress 3.1+ Admin Bar
function update_notifier_bar_menu() {
if (function_exists('simplexml_load_string')) { // Stop if simplexml_load_string funtion isn't available
global $wp_admin_bar, $wpdb;
if ( !is_super_admin() || !is_admin_bar_showing() ) // Don't display notification in admin bar if it's disabled or the current user isn't an administrator
return;
$xml = get_latest_theme_version(NOTIFIER_CACHE_INTERVAL); // Get the latest remote XML file on our server
$theme_data = wp_get_theme(); // Read theme current version from the style.css
if( (float)$xml->latest > (float)$theme_data->Version) { // Compare current theme version with the remote XML version
$wp_admin_bar->add_menu( array( 'id' => 'update_notifier', 'title' => '<span>' . NOTIFIER_THEME_NAME . ' <span id="ab-updates">New Updates</span></span>', 'href' => get_admin_url() . 'index.php?page=theme-update-notifier' ) );
}
}
}
add_action( 'admin_bar_menu', 'update_notifier_bar_menu', 1000 );
// The notifier page
function update_notifier() {
$xml = get_latest_theme_version(NOTIFIER_CACHE_INTERVAL); // Get the latest remote XML file on our server
$theme_data = wp_get_theme(); // Read theme current version from the style.css ?>
<style>
.update-nag { display: none; }
#instructions {max-width: 670px;}
h3.title {margin: 30px 0 0 0; padding: 30px 0 0 0; border-top: 1px solid #ddd;}
</style>
<div class="wrap">
<div id="icon-tools" class="icon32"></div>
<h2><?php _e('Touchfolio Theme Update', 'dsframework'); ?></h2>
<div id="message" class="updated below-h2"><p><?php _e('<strong>There is a new version of Touchfolio theme available.</strong> Visit <a style="text-decoration:underline;" href="http://dimsemenov.com/themes/touchfolio/changelog.html">changelog page</a> to see what\'s new and how to update.', 'dsframework'); ?></p></div>
<div id="instructions">
<p><?php _e('<strong>Please note:</strong> make a backup of Touchfolio theme inside your WordPress installation folder <strong>', 'dsframework'); ?>/wp-content/themes/<?php echo NOTIFIER_THEME_FOLDER_NAME; ?>/</strong> before updating.</p>
</div>
</div>
<?php }
// Get the remote XML file contents and return its data (Version and Changelog)
// Uses the cached version if available and inside the time interval defined
function get_latest_theme_version($interval) {
$notifier_file_url = NOTIFIER_XML_FILE;
$db_cache_field = 'notifier-cache';
$db_cache_field_last_updated = 'notifier-cache-last-updated';
$last = get_option( $db_cache_field_last_updated );
$now = time();
// check the cache
if ( !$last || (( $now - $last ) > $interval) ) {
// cache doesn't exist, or is old, so refresh it
if( function_exists('curl_init') ) { // if cURL is available, use it...
$ch = curl_init($notifier_file_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$cache = curl_exec($ch);
curl_close($ch);
} else {
$cache = file_get_contents($notifier_file_url); // ...if not, use the common file_get_contents()
}
if ($cache) {
// we got good results
update_option( $db_cache_field, $cache );
update_option( $db_cache_field_last_updated, time() );
}
// read from the cache file
$notifier_data = get_option( $db_cache_field );
}
else {
// cache file is fresh enough, so read from it
$notifier_data = get_option( $db_cache_field );
}
// Let's see if the $xml data was returned as we expected it to.
// If it didn't, use the default 1.0 as the latest version so that we don't have problems when the remote server hosting the XML file is down
if( strpos((string)$notifier_data, '<notifier>') === false ) {
$notifier_data = '<?xml version="1.0" encoding="UTF-8"?><notifier><latest>1.0</latest><changelog></changelog></notifier>';
}
// Load the remote XML data into a variable and return it
$xml = simplexml_load_string($notifier_data);
return $xml;
}
?>