/wp-includes/update.php

<?php

/**

 * A simple set of functions to check our version 1.0 update service.

 *

 * @package WordPress

 * @since 2.3.0

 */



/**

 * Check WordPress version against the newest version.

 *

 * The WordPress version, PHP version, and Locale is sent. Checks against the

 * WordPress server at api.wordpress.org server. Will only check if WordPress

 * isn't installing.

 *

 * @package WordPress

 * @since 2.3.0

 * @uses $wp_version Used to check against the newest WordPress version.

 *

 * @return mixed Returns null if update is unsupported. Returns false if check is too soon.

 */

function wp_version_check() {

	if ( defined('WP_INSTALLING') )

		return;



	global $wp_version, $wpdb, $wp_local_package;

	$php_version = phpversion();



	$current = get_site_transient( 'update_core' );

	if ( ! is_object($current) ) {

		$current = new stdClass;

		$current->updates = array();

		$current->version_checked = $wp_version;

	}



	$locale = apply_filters( 'core_version_check_locale', get_locale() );



	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$current->last_checked = time();

	set_site_transient( 'update_core', $current );



	if ( method_exists( $wpdb, 'db_version' ) )

		$mysql_version = preg_replace('/[^0-9.].*/', '', $wpdb->db_version());

	else

		$mysql_version = 'N/A';



	$num_blogs = 1;

	$wp_install = home_url( '/' );

	$multisite_enabled = 0;

	$user_count = count_users( );

	if ( is_multisite( ) ) {

		$num_blogs = get_blog_count( );

		$wp_install = network_site_url( );

		$multisite_enabled = 1;

	}



	$local_package = isset( $wp_local_package )? $wp_local_package : '';

	$url = "http://api.wordpress.org/core/version-check/1.5/?version=$wp_version&php=$php_version&locale=$locale&mysql=$mysql_version&local_package=$local_package&blogs=$num_blogs&users={$user_count['total_users']}&multisite_enabled=$multisite_enabled";



	$options = array(

		'timeout' => ( ( defined('DOING_CRON') && DOING_CRON ) ? 30 : 3 ),

		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),

		'headers' => array(

			'wp_install' => $wp_install,

			'wp_blog' => home_url( '/' )

		)

	);



	$response = wp_remote_get($url, $options);



	if ( is_wp_error( $response ) )

		return false;



	if ( 200 != $response['response']['code'] )

		return false;



	$body = trim( $response['body'] );

	$body = str_replace(array("\r\n", "\r"), "\n", $body);

	$new_options = array();

	foreach ( explode( "\n\n", $body ) as $entry ) {

		$returns = explode("\n", $entry);

		$new_option = new stdClass();

		$new_option->response = esc_attr( $returns[0] );

		if ( isset( $returns[1] ) )

			$new_option->url = esc_url( $returns[1] );

		if ( isset( $returns[2] ) )

			$new_option->package = esc_url( $returns[2] );

		if ( isset( $returns[3] ) )

			$new_option->current = esc_attr( $returns[3] );

		if ( isset( $returns[4] ) )

			$new_option->locale = esc_attr( $returns[4] );

		if ( isset( $returns[5] ) )

			$new_option->php_version = esc_attr( $returns[5] );

		if ( isset( $returns[6] ) )

			$new_option->mysql_version = esc_attr( $returns[6] );

		$new_options[] = $new_option;

	}



	$updates = new stdClass();

	$updates->updates = $new_options;

	$updates->last_checked = time();

	$updates->version_checked = $wp_version;

	set_site_transient( 'update_core',  $updates);

}



/**

 * Check plugin versions against the latest versions hosted on WordPress.org.

 *

 * The WordPress version, PHP version, and Locale is sent along with a list of

 * all plugins installed. Checks against the WordPress server at

 * api.wordpress.org. Will only check if WordPress isn't installing.

 *

 * @package WordPress

 * @since 2.3.0

 * @uses $wp_version Used to notidy the WordPress version.

 *

 * @return mixed Returns null if update is unsupported. Returns false if check is too soon.

 */

function wp_update_plugins() {

	global $wp_version;



	if ( defined('WP_INSTALLING') )

		return false;



	// If running blog-side, bail unless we've not checked in the last 12 hours

	if ( !function_exists( 'get_plugins' ) )

		require_once( ABSPATH . 'wp-admin/includes/plugin.php' );



	$plugins = get_plugins();

	$active  = get_option( 'active_plugins', array() );

	$current = get_site_transient( 'update_plugins' );

	if ( ! is_object($current) )

		$current = new stdClass;



	$new_option = new stdClass;

	$new_option->last_checked = time();

	$timeout = 'load-plugins.php' == current_filter() ? 3600 : 43200; //Check for updated every 60 minutes if hitting the themes page, Else, check every 12 hours

	$time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );



	$plugin_changed = false;

	foreach ( $plugins as $file => $p ) {

		$new_option->checked[ $file ] = $p['Version'];



		if ( !isset( $current->checked[ $file ] ) || strval($current->checked[ $file ]) !== strval($p['Version']) )

			$plugin_changed = true;

	}



	if ( isset ( $current->response ) && is_array( $current->response ) ) {

		foreach ( $current->response as $plugin_file => $update_details ) {

			if ( ! isset($plugins[ $plugin_file ]) ) {

				$plugin_changed = true;

				break;

			}

		}

	}



	// Bail if we've checked in the last 12 hours and if nothing has changed

	if ( $time_not_changed && !$plugin_changed )

		return false;



	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$current->last_checked = time();

	set_site_transient( 'update_plugins', $current );



	$to_send = (object) compact('plugins', 'active');



	$options = array(

		'timeout' => ( ( defined('DOING_CRON') && DOING_CRON ) ? 30 : 3),

		'body' => array( 'plugins' => serialize( $to_send ) ),

		'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);



	$raw_response = wp_remote_post('http://api.wordpress.org/plugins/update-check/1.0/', $options);



	if ( is_wp_error( $raw_response ) )

		return false;



	if ( 200 != $raw_response['response']['code'] )

		return false;



	$response = unserialize( $raw_response['body'] );



	if ( false !== $response )

		$new_option->response = $response;

	else

		$new_option->response = array();



	set_site_transient( 'update_plugins', $new_option );

}



/**

 * Check theme versions against the latest versions hosted on WordPress.org.

 *

 * A list of all themes installed in sent to WP. Checks against the

 * WordPress server at api.wordpress.org. Will only check if WordPress isn't

 * installing.

 *

 * @package WordPress

 * @since 2.7.0

 * @uses $wp_version Used to notidy the WordPress version.

 *

 * @return mixed Returns null if update is unsupported. Returns false if check is too soon.

 */

function wp_update_themes( ) {

	global $wp_version;



	if ( defined( 'WP_INSTALLING' ) )

		return false;



	if ( !function_exists( 'get_themes' ) )

		require_once( ABSPATH . 'wp-includes/theme.php' );



	$installed_themes = get_themes( );

	$current_theme = get_site_transient( 'update_themes' );

	if ( ! is_object($current_theme) )

		$current_theme = new stdClass;



	$new_option = new stdClass;

	$new_option->last_checked = time( );

	$timeout = 'load-themes.php' == current_filter() ? 3600 : 43200; //Check for updated every 60 minutes if hitting the themes page, Else, check every 12 hours

	$time_not_changed = isset( $current_theme->last_checked ) && $timeout > ( time( ) - $current_theme->last_checked );



	$themes = array();

	$checked = array();

	$themes['current_theme'] = (array) $current_theme;

	foreach ( (array) $installed_themes as $theme_title => $theme ) {

		$themes[$theme['Stylesheet']] = array();

		$checked[$theme['Stylesheet']] = $theme['Version'];



		foreach ( (array) $theme as $key => $value )

			$themes[$theme['Stylesheet']][$key] = $value;

	}



	$theme_changed = false;

	foreach ( $checked as $slug => $v ) {

		$new_option->checked[ $slug ] = $v;



		if ( !isset( $current_theme->checked[ $slug ] ) || strval($current_theme->checked[ $slug ]) !== strval($v) )

			$theme_changed = true;

	}



	if ( isset ( $current_theme->response ) && is_array( $current_theme->response ) ) {

		foreach ( $current_theme->response as $slug => $update_details ) {

			if ( ! isset($checked[ $slug ]) ) {

				$theme_changed = true;

				break;

			}

		}

	}



	if ( $time_not_changed && !$theme_changed )

		return false;



	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$current_theme->last_checked = time();

	set_site_transient( 'update_themes', $current_theme );



	$current_theme->template = get_option( 'template' );



	$options = array(

		'timeout' => ( ( defined('DOING_CRON') && DOING_CRON ) ? 30 : 3),

		'body'			=> array( 'themes' => serialize( $themes ) ),

		'user-agent'	=> 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);



	$raw_response = wp_remote_post( 'http://api.wordpress.org/themes/update-check/1.0/', $options );



	if ( is_wp_error( $raw_response ) )

		return false;



	if ( 200 != $raw_response['response']['code'] )

		return false;



	$response = unserialize( $raw_response['body'] );

	if ( $response ) {

		$new_option->checked = $checked;

		$new_option->response = $response;

	}



	set_site_transient( 'update_themes', $new_option );

}



function _maybe_update_core() {

	global $wp_version;



	$current = get_site_transient( 'update_core' );



	if ( isset( $current->last_checked ) &&

		43200 > ( time() - $current->last_checked ) &&

		isset( $current->version_checked ) &&

		$current->version_checked == $wp_version )

		return;



	wp_version_check();

}

/**

 * Check the last time plugins were run before checking plugin versions.

 *

 * This might have been backported to WordPress 2.6.1 for performance reasons.

 * This is used for the wp-admin to check only so often instead of every page

 * load.

 *

 * @since 2.7.0

 * @access private

 */

function _maybe_update_plugins() {

	$current = get_site_transient( 'update_plugins' );

	if ( isset( $current->last_checked ) && 43200 > ( time() - $current->last_checked ) )

		return;

	wp_update_plugins();

}



/**

 * Check themes versions only after a duration of time.

 *

 * This is for performance reasons to make sure that on the theme version

 * checker is not run on every page load.

 *

 * @since 2.7.0

 * @access private

 */

function _maybe_update_themes( ) {

	$current = get_site_transient( 'update_themes' );

	if ( isset( $current->last_checked ) && 43200 > ( time( ) - $current->last_checked ) )

		return;



	wp_update_themes();

}



add_action( 'admin_init', '_maybe_update_core' );

add_action( 'wp_version_check', 'wp_version_check' );



add_action( 'load-plugins.php', 'wp_update_plugins' );

add_action( 'load-update.php', 'wp_update_plugins' );

add_action( 'load-update-core.php', 'wp_update_plugins' );

add_action( 'admin_init', '_maybe_update_plugins' );

add_action( 'wp_update_plugins', 'wp_update_plugins' );



add_action( 'load-themes.php', 'wp_update_themes' );

add_action( 'load-update.php', 'wp_update_themes' );

add_action( 'load-update-core.php', 'wp_update_themes' );

add_action( 'admin_init', '_maybe_update_themes' );

add_action( 'wp_update_themes', 'wp_update_themes' );



if ( !wp_next_scheduled('wp_version_check') && !defined('WP_INSTALLING') )

	wp_schedule_event(time(), 'twicedaily', 'wp_version_check');



if ( !wp_next_scheduled('wp_update_plugins') && !defined('WP_INSTALLING') )

	wp_schedule_event(time(), 'twicedaily', 'wp_update_plugins');



if ( !wp_next_scheduled('wp_update_themes') && !defined('WP_INSTALLING') )

	wp_schedule_event(time(), 'twicedaily', 'wp_update_themes');



?>