Viewing file:  BrowserCache.php (10.17 KB) -rw-rw-rw-
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<?php
/**
* W3 ObjectCache plugin
*/
if (!defined('W3TC')) {
die();
}
w3_require_once(W3TC_LIB_W3_DIR . '/Plugin.php');
/**
* Class W3_Plugin_BrowserCache
*/
class W3_Plugin_BrowserCache extends W3_Plugin {
/**
* Runs plugin
*/
function run() {
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 ($this->can_ob()) {
w3tc_add_ob_callback('browsercache', array($this,'ob_callback'));
// modify CDN urls too
add_filter('w3tc_cdn_url', array(
&$this,
'w3tc_cdn_url')
,0, 2);
}
}
/**
* Check if we can start OB
*
* @return boolean
*/
function can_ob() {
/**
* Replace feature should be enabled
*/
if (!$this->_config->get_boolean('browsercache.cssjs.replace') && !$this->_config->get_boolean('browsercache.html.replace') && !$this->_config->get_boolean('browsercache.other.replace')) {
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 ($buffer != '' && w3_is_xml($buffer)) {
$domain_url_regexp = w3_get_domain_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, $url, , , , , $extension) = $matches;
if (!$this->_url_has_to_be_replaced($url, $extension))
return $match;
static $id = null;
if ($id === null)
$id = $this->get_replace_id();
$url = w3_remove_query($url);
$url .= (strstr($url, '?') !== false ? '&' : '?') . $id;
if ($attr != 'w3tc_load_js(')
return sprintf('%s="%s"', $attr, $url);
return sprintf('%s\'%s\'', $attr, $url);
}
/**
* Link replace for CDN url
*
* @param string $matches
* @return string
*/
function w3tc_cdn_url($url, $original_url) {
// decouple extension
$matches = array();
if (!preg_match('/\.([a-zA-Z0-9]+)$/', $original_url, $matches))
return $url;
$extension = $matches[1];
if (!$this->_url_has_to_be_replaced($original_url, $extension))
return $url;
static $id = null;
if ($id === null)
$id = $this->get_replace_id();
$url .= (strstr($url, '?') !== false ? '&' : '?') . $id;
return $url;
}
function _url_has_to_be_replaced($url, $extension) {
static $extensions = null;
if ($extensions === null)
$extensions = $this->get_replace_extensions();
static $exceptions = null;
if ($exceptions === null)
$exceptions = $this->_config->get_array('browsercache.replace.exceptions');
if (!in_array($extension, $extensions))
return false;
$test_url = w3_remove_query($url);
foreach ($exceptions as $exception) {
if (trim($exception) && preg_match('/' . $exception . '/',$test_url))
return false;
}
return true;
}
/**
* Returns replace ID
*
* @return string
*/
function get_replace_id() {
static $cache_id = null;
if ($cache_id === null) {
$keys = array(
'browsercache.cssjs.compression',
'browsercache.cssjs.expires',
'browsercache.cssjs.lifetime',
'browsercache.cssjs.cache.control',
'browsercache.cssjs.cache.policy',
'browsercache.cssjs.etag',
'browsercache.cssjs.w3tc',
'browsercache.html.compression',
'browsercache.html.expires',
'browsercache.html.lifetime',
'browsercache.html.cache.control',
'browsercache.html.cache.policy',
'browsercache.html.etag',
'browsercache.html.w3tc',
'browsercache.other.compression',
'browsercache.other.expires',
'browsercache.other.lifetime',
'browsercache.other.cache.control',
'browsercache.other.cache.policy',
'browsercache.other.etag',
'browsercache.other.w3tc',
'browsercache.timestamp'
);
$values = array();
foreach ($keys as $key) {
$values[] = $this->_config->get($key);
}
$cache_id = substr(md5(implode('', $values)), 0, 6);
}
return $cache_id;
}
/**
* Returns replace extensions
*
* @return array
*/
function get_replace_extensions() {
static $extensions = null;
if ($extensions === null) {
$types = array();
$extensions = array();
if ($this->_config->get_boolean('browsercache.cssjs.replace')) {
$types = array_merge($types, array_keys($this->_get_cssjs_types()));
}
if ($this->_config->get_boolean('browsercache.html.replace')) {
$types = array_merge($types, array_keys($this->_get_html_types()));
}
if ($this->_config->get_boolean('browsercache.other.replace')) {
$types = array_merge($types, array_keys($this->_get_other_types()));
}
foreach ($types as $type) {
$extensions = array_merge($extensions, explode('|', $type));
}
}
return $extensions;
}
/**
* Send headers
*/
function send_headers() {
@header('X-Powered-By: ' . W3TC_POWERED_BY);
}
/**
* Returns CSS/JS mime types
*
* @return array
*/
function _get_cssjs_types() {
$mime_types = include W3TC_INC_DIR . '/mime/cssjs.php';
return $mime_types;
}
/**
* Returns HTML mime types
*
* @return array
*/
function _get_html_types() {
$mime_types = include W3TC_INC_DIR . '/mime/html.php';
return $mime_types;
}
/**
* Returns other mime types
*
* @return array
*/
function _get_other_types() {
$mime_types = include W3TC_INC_DIR . '/mime/other.php';
return $mime_types;
}
/**
* Returns cache config for CDN
*
* @return array
*/
function get_cache_config() {
$config = array();
$e = w3_instance('W3_BrowserCacheAdminEnvironment');
$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 $headers
* @param $wp
* @return
*/
function filter_wp_headers($headers, $wp) {
if (!empty($wp->query_vars['feed']))
unset($headers['ETag']);
return $headers;
}
}
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