| Current File : /home/aventura/www/site/wp-content/plugins/w3-total-cache/BrowserCache_Plugin.php |
<?php
namespace W3TC;
/**
* W3 ObjectCache plugin
*/
class BrowserCache_Plugin {
private $_config = null;
private $browsercache_rewrite;
function __construct() {
$this->_config = Dispatcher::config();
}
/**
* Runs plugin
*/
function run() {
add_filter( 'w3tc_admin_bar_menu',
array( $this, 'w3tc_admin_bar_menu' ) );
if ( $this->_config->get_boolean( 'browsercache.html.w3tc' ) ) {
add_action( 'send_headers',
array( $this, 'send_headers' ) );
}
if ( !$this->_config->get_boolean( 'browsercache.html.etag' ) ) {
add_filter( 'wp_headers',
array( $this, 'filter_wp_headers' ),
0, 2 );
}
if ( $this->can_ob() ) {
$this->browsercache_rewrite =
$this->_config->get_boolean( 'browsercache.rewrite' );
Util_Bus::add_ob_callback( 'browsercache', array( $this, 'ob_callback' ) );
// modify CDN urls too
add_filter( 'w3tc_cdn_url',
array( $this, 'w3tc_cdn_url' ),
0, 3 );
}
}
/**
* Check if we can start OB
*
* @return boolean
*/
function can_ob() {
/**
* Replace feature should be enabled
*/
if ( !$this->_config->get_boolean( 'browsercache.cssjs.replace' ) &&
!$this->_config->get_boolean( 'browsercache.html.replace' ) &&
!$this->_config->get_boolean( 'browsercache.other.replace' ) &&
!$this->_config->get_boolean( 'browsercache.cssjs.querystring' ) &&
!$this->_config->get_boolean( 'browsercache.html.querystring' ) &&
!$this->_config->get_boolean( 'browsercache.other.querystring' )) {
return false;
}
/**
* Skip if admin
*/
if ( defined( 'WP_ADMIN' ) ) {
return false;
}
/**
* Skip if doing AJAX
*/
if ( defined( 'DOING_AJAX' ) ) {
return false;
}
/**
* Skip if doing cron
*/
if ( defined( 'DOING_CRON' ) ) {
return false;
}
/**
* Skip if APP request
*/
if ( defined( 'APP_REQUEST' ) ) {
return false;
}
/**
* Skip if XMLRPC request
*/
if ( defined( 'XMLRPC_REQUEST' ) ) {
return false;
}
/**
* Check for WPMU's and WP's 3.0 short init
*/
if ( defined( 'SHORTINIT' ) && SHORTINIT ) {
return false;
}
/**
* Check User Agent
*/
if ( isset( $_SERVER['HTTP_USER_AGENT'] ) &&
stristr( $_SERVER['HTTP_USER_AGENT'], W3TC_POWERED_BY ) !== false ) {
return false;
}
return true;
}
/**
* Output buffer callback
*
* @param string $buffer
* @return mixed
*/
function ob_callback( $buffer ) {
if ( $buffer != '' && Util_Content::is_html_xml( $buffer ) ) {
$domain_url_regexp = Util_Environment::home_domain_root_url_regexp();
$buffer = preg_replace_callback(
'~(href|src|action|extsrc|asyncsrc|w3tc_load_js\()=?([\'"])((' .
$domain_url_regexp .
')?(/[^\'"/][^\'"]*\.([a-z-_]+)([\?#][^\'"]*)?))[\'"]~Ui', array(
$this,
'link_replace_callback'
), $buffer );
}
return $buffer;
}
/**
* Link replace callback
*
* @param string $matches
* @return string
*/
function link_replace_callback( $matches ) {
list ( $match, $attr, $quote, $url, , , , , $extension ) = $matches;
$ops = $this->_get_url_mutation_operations( $url, $extension );
if ( is_null( $ops ) )
return $match;
$url = $this->mutate_url( $url, $ops, !$this->browsercache_rewrite );
if ( $attr != 'w3tc_load_js(' )
return $attr . '=' . $quote . $url . $quote;
return sprintf( '%s\'%s\'', $attr, $url );
}
/**
* Link replace for CDN url
*
* @param string $matches
* @return string
*/
function w3tc_cdn_url( $url, $original_url, $is_cdn_mirror ) {
// decouple extension
$matches = array();
if ( !preg_match( '/\.([a-zA-Z0-9]+)($|[\?])/', $original_url, $matches ) )
return $url;
$extension = $matches[1];
$ops = $this->_get_url_mutation_operations( $original_url, $extension );
if ( is_null( $ops ) )
return $url;
// for push cdns each flush would require manual reupload of files
$mutate_by_querystring = !$this->browsercache_rewrite || !$is_cdn_mirror;
$url = $this->mutate_url( $url, $ops, $mutate_by_querystring );
return $url;
}
private function mutate_url( $url, $ops, $mutate_by_querystring ) {
$query_pos = strpos( $url, '?' );
if ( isset( $ops['querystring'] ) && $query_pos !== false ) {
$url = substr( $url, 0, $query_pos );
$query_pos = false;
}
if ( isset( $ops['replace'] ) ) {
$id = $this->get_filename_uniqualizator();
if ( $mutate_by_querystring ) {
if ( $query_pos !== false ) {
$url = substr( $url, 0, $query_pos + 1 ) . $id . '&' .
substr( $url, $query_pos + 1 );
} else {
$tag_pos = strpos( $url, '#' );
if ( $tag_pos === false ) {
$url .= '?' . $id;
} else {
$url = substr( $url, 0, $tag_pos ) . '?' . $id .
substr( $url, $tag_pos );
}
}
} else {
// add $id to url before extension
$url_query = '';
if ( $query_pos !== false ) {
$url_query = substr( $url, $query_pos );
$url = substr( $url, 0, $query_pos );
}
$ext_pos = strrpos( $url, '.' );
$extension = substr( $url, $ext_pos );
$url = substr( $url, 0, strlen( $url ) - strlen( $extension ) ) .
'.' . $id . $extension . $url_query;
}
}
return $url;
}
function _get_url_mutation_operations( $url, $extension ) {
static $extensions = null;
if ( $extensions === null ) {
$core = Dispatcher::component( 'BrowserCache_Core' );
$extensions = $core->get_replace_querystring_extensions( $this->_config );
}
static $exceptions = null;
if ( $exceptions === null )
$exceptions = $this->_config->get_array( 'browsercache.replace.exceptions' );
if ( !isset( $extensions[$extension] ) )
return null;
$test_url = Util_Environment::remove_query( $url );
foreach ( $exceptions as $exception ) {
$escaped = str_replace( '~', '\~', $exception );
if ( trim( $exception ) && preg_match( '~' . $escaped . '~', $test_url ) )
return null;
}
return $extensions[$extension];
}
/**
* Returns replace ID
*
* @return string
*/
function get_filename_uniqualizator() {
static $cache_id = null;
if ( $cache_id === null ) {
$value = get_option( 'w3tc_browsercache_flush_timestamp' );
if ( empty( $value ) ) {
$value = rand( 10000, 99999 ) . '';
update_option( 'w3tc_browsercache_flush_timestamp', $value );
}
$cache_id = substr( $value, 0, 5 );
}
return 'x' . $cache_id;
}
public function w3tc_admin_bar_menu( $menu_items ) {
$browsercache_update_media_qs =
( $this->_config->get_boolean( 'browsercache.cssjs.replace' ) ||
$this->_config->get_boolean( 'browsercache.other.replace' ) );
if ( $browsercache_update_media_qs ) {
$menu_items['20190.browsercache'] = array(
'id' => 'w3tc_flush_browsercache',
'parent' => 'w3tc_flush',
'title' => __( 'Browser Cache: Update Media Query String', 'w3-total-cache' ),
'href' => wp_nonce_url( network_admin_url(
'admin.php?page=w3tc_dashboard&w3tc_flush_browser_cache' ),
'w3tc' )
);
}
return $menu_items;
}
/**
* Send headers
*/
function send_headers() {
@header( 'X-Powered-By: ' . Util_Environment::w3tc_header() );
}
/**
* Returns cache config for CDN
*
* @return array
*/
function get_cache_config() {
$config = array();
$e = Dispatcher::component( 'BrowserCache_Environment' );
$mime_types = $e->get_mime_types();
foreach ( $mime_types as $type => $extensions )
$this->_get_cache_config( $config, $extensions, $type );
return $config;
}
/**
* Writes cache config
*
* @param string $config
* @param array $mime_types
* @param array $section
* @return void
*/
function _get_cache_config( &$config, $mime_types, $section ) {
$expires = $this->_config->get_boolean( 'browsercache.' . $section . '.expires' );
$lifetime = $this->_config->get_integer( 'browsercache.' . $section . '.lifetime' );
$cache_control = $this->_config->get_boolean( 'browsercache.' . $section . '.cache.control' );
$cache_policy = $this->_config->get_string( 'browsercache.' . $section . '.cache.policy' );
$etag = $this->_config->get_boolean( 'browsercache.' . $section . '.etag' );
$w3tc = $this->_config->get_boolean( 'browsercache.' . $section . '.w3tc' );
foreach ( $mime_types as $mime_type ) {
if ( is_array( $mime_type ) ) {
foreach ( $mime_type as $mime_type2 )
$config[$mime_type2] = array(
'etag' => $etag,
'w3tc' => $w3tc,
'lifetime' => $lifetime,
'expires' => $expires,
'cache_control' => ( $cache_control ? $cache_policy : false )
);
} else
$config[$mime_type] = array(
'etag' => $etag,
'w3tc' => $w3tc,
'lifetime' => $lifetime,
'expires' => $expires,
'cache_control' => ( $cache_control ? $cache_policy : false )
);
}
}
/**
* Filters headers set by WordPress
*
* @param unknown $headers
* @param unknown $wp
* @return
*/
function filter_wp_headers( $headers, $wp ) {
if ( !empty( $wp->query_vars['feed'] ) )
unset( $headers['ETag'] );
return $headers;
}
}