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<?php
namespace W3TC;
// To support legacy updates with old add-ins
if ( class_exists( 'PgCache_ContentGrabber' ) )
return;
/**
* W3 PgCache
*/
/**
* class PgCache
*/
class PgCache_ContentGrabber {
/**
* Advanced cache config
*/
var $_config = null;
/**
* Caching flag
*
* @var boolean
*/
var $_caching = false;
/**
* Time start
*
* @var double
*/
var $_time_start = 0;
/**
* Lifetime
*
* @var integer
*/
var $_lifetime = 0;
/**
* Enhanced mode flag
*
* @var boolean
*/
var $_enhanced_mode = false;
/**
* Debug flag
*
* @var boolean
*/
var $_debug = false;
/**
* Request host
*
* @var string
*/
var $_request_host = '';
/**
* Request URI
*
* @var string
*/
var $_request_uri = '';
/**
* Page key
*
* @var string
*/
var $_page_key = '';
private $_page_key_extension;
/**
* Shutdown buffer
*
* @var string
*/
var $_shutdown_buffer = '';
/**
* Mobile object
*
* @var W3_Mobile
*/
var $_mobile = null;
/**
* Referrer object
*
* @var W3_Referrer
*/
var $_referrer = null;
/**
* Cache reject reason
*
* @var string
*/
var $cache_reject_reason = '';
/**
*
*
* @var If sitemap was matched
*/
var $_sitemap_matched;
/**
*
*
* @var bool If cached page should be displayed after init
*/
var $_late_init = false;
var $_cached_data = null;
var $_old_exists = false;
/**
* PHP5 Constructor
*/
function __construct() {
$this->_config = Dispatcher::config();
$this->_debug = $this->_config->get_boolean( 'pgcache.debug' );
$request_host = Util_Environment::host();
$this->_request_host = $request_host;
$this->_request_uri = $_SERVER['REQUEST_URI'];
$this->_lifetime = $this->_config->get_integer( 'pgcache.lifetime' );
$this->_late_init = $this->_config->get_boolean( 'pgcache.late_init' );
$this->_late_caching = $this->_config->get_boolean( 'pgcache.late_caching' );
$this->_enhanced_mode = ( $this->_config->get_string( 'pgcache.engine' ) == 'file_generic' );
if ( $this->_config->get_boolean( 'mobile.enabled' ) ) {
$this->_mobile = Dispatcher::component( 'Mobile_UserAgent' );
}
if ( $this->_config->get_boolean( 'referrer.enabled' ) ) {
$this->_referrer = Dispatcher::component( 'Mobile_Referrer' );
}
}
/**
* Do cache logic
*/
function process() {
/**
* Skip caching for some pages
*/
switch ( true ) {
case defined( 'DONOTCACHEPAGE' ):
if ( $this->_debug ) {
self::log( 'skip processing because of DONOTCACHEPAGE constant' );
}
return;
case defined( 'DOING_AJAX' ):
case defined( 'DOING_CRON' ):
case defined( 'APP_REQUEST' ):
case defined( 'XMLRPC_REQUEST' ):
case defined( 'WP_ADMIN' ):
case ( defined( 'SHORTINIT' ) && SHORTINIT ):
if ( $this->_debug ) {
self::log( 'skip processing because of generic constant' );
}
return;
}
/**
* Do page cache logic
*/
if ( $this->_debug ) {
$this->_time_start = Util_Debug::microtime();
}
$this->_caching = $this->_can_cache();
global $w3_late_init;
if ( $this->_debug ) {
self::log( 'start, can_cache: ' .
( $this->_caching ? 'true' : 'false' ) );
}
$this->_page_key_extension = $this->_get_key_extension();
if ( !$this->_page_key_extension['cache'] ) {
$this->_caching = false;
$this->cache_reject_reason =
$this->_page_key_extension['cache_reject_reason'];
}
if ( $this->_caching && !$this->_late_caching ) {
$this->_cached_data = $this->_extract_cached_page( false );
if ( $this->_cached_data ) {
if ( $this->_late_init ) {
$w3_late_init = true;
return;
} else {
$this->process_cached_page_and_exit( $this->_cached_data );
// if is passes here - exit is not possible now and
// will happen on init
return;
}
} else
$this->_late_init = false;
} else {
$this->_late_init = false;
}
$w3_late_init = $this->_late_init;
/**
* Start output buffering
*/
Util_Bus::add_ob_callback( 'pagecache', array( $this, 'ob_callback' ) );
}
/**
* Extracts page from cache
*
* @return boolean
*/
function _extract_cached_page( $with_filter ) {
$cache = $this->_get_cache();
$mobile_group = $this->_page_key_extension['useragent'];
$referrer_group = $this->_page_key_extension['referrer'];
$encryption = $this->_page_key_extension['encryption'];
$compression = $this->_page_key_extension['compression'];
$group = '';
$sitemap_regex = $this->_config->get_string( 'pgcache.purge.sitemap_regex' );
if ( $sitemap_regex && preg_match( '/' . $sitemap_regex . '/', basename( $this->_request_uri ) ) ) {
$group = 'sitemaps';
$this->_sitemap_matched = true;
} else {
$this->_sitemap_matched = false;
}
/**
* Check if page is cached
*/
if ( !$this->_set_extract_page_key( $this->_page_key_extension, $with_filter ) ) {
$data = null;
} else {
$data = $cache->get_with_old( $this->_page_key, $group );
list( $data, $this->_old_exists ) = $data;
}
/**
* Try to get uncompressed version of cache
*/
if ( $compression && !$data ) {
if ( !$this->_set_extract_page_key(
array_merge( $this->_page_key_extension,
array( 'compression' => '') ), $with_filter ) ) {
$data = null;
} else {
$data = $cache->get_with_old( $this->_page_key, $group );
list( $data, $this->_old_exists ) = $data;
$compression = false;
}
}
if ( !$data ) {
if ( $this->_debug ) {
self::log( 'no cache entry for ' . $this->_page_key );
}
return null;
}
$data['compression'] = $compression;
return $data;
}
private function _set_extract_page_key( $page_key_extension, $with_filter ) {
$this->_page_key = $this->_get_page_key( $page_key_extension );
if ( $with_filter ) {
// return empty value if caching should not happen
$this->_page_key = apply_filters( 'w3tc_page_extract_key',
$this->_page_key,
$page_key_extension['useragent'],
$page_key_extension['referrer'],
$page_key_extension['encryption'],
$page_key_extension['compression'],
$page_key_extension['content_type'],
$this->_request_host . $this->_request_uri,
$page_key_extension );
}
if ( !empty( $this->_page_key ) )
return true;
$this->caching = false;
$this->cache_reject_reason =
'w3tc_page_extract_key filter result forced not to cache';
return false;
}
/**
* Process extracted cached pages
*
* @param unknown $data
*/
private function process_cached_page_and_exit( $data ) {
/**
* Do Bad Behavior check
*/
$this->_bad_behavior();
$is_404 = $data['404'];
$headers = $data['headers'];
$content = $data['content'];
$has_dynamic = isset( $data['has_dynamic'] ) && $data['has_dynamic'];
$etag = md5( $content );
if ( $has_dynamic ) {
// its last modification date is now, and any compression
// browser wants cant be used, since its compressed now
$time = time();
$compression = $this->_page_key_extension['compression'];
} else {
$time = $data['time'];
$compression = $data['compression'];
}
/**
* Send headers
*/
$this->_send_headers( $is_404, $time, $etag, $compression, $headers );
if ( isset( $_SERVER['REQUEST_METHOD'] ) && $_SERVER['REQUEST_METHOD'] == 'HEAD' )
return;
// parse dynamic content and compress if it's dynamic page with mfuncs
if ( $has_dynamic ) {
$content = $this->_parse_dynamic( $content );
$content = $this->_compress( $content, $compression );
}
echo $content;
Dispatcher::usage_statistics_apply_before_init_and_exit( array( $this,
'w3tc_usage_statistics_of_request' ) );
}
/**
* Output buffering callback
*
* @param string $buffer
* @return string
*/
function ob_callback( $buffer ) {
if ( !$this->_is_cacheable_content_type() ) {
if ( $this->_debug )
self::log( 'storing cached page - not a cached content' );
return $buffer;
}
$compression = false;
$has_dynamic = $this->_has_dynamic( $buffer );
$original_can_cache = $this->_can_cache2( $buffer );
$can_cache = apply_filters( 'w3tc_can_cache', $original_can_cache, $this, $buffer );
if ( $can_cache != $original_can_cache )
$this->cache_reject_reason = 'Third-party plugin has modified caching activity';
if ( $this->_debug ) {
self::log( 'storing cached page: ' .
( $can_cache ? 'true' : 'false' ) .
' original ' . ( $this->_caching ? ' true' : 'false' ) .
' reason ' . $this->cache_reject_reason );
}
$buffer = str_replace('{w3tc_pagecache_reject_reason}',
( $this->cache_reject_reason != '' ? sprintf( ' (%s)', $this->cache_reject_reason )
: '' ),
$buffer );
if ( $can_cache ) {
$buffer = $this->_maybe_save_cached_result( $buffer, $has_dynamic );
} else {
if ( $has_dynamic ) {
// send common headers since output will be compressed
$compression_header = $this->_page_key_extension['compression'];
if ( defined( 'W3TC_PAGECACHE_OUTPUT_COMPRESSION_OFF' ) )
$compression_header = false;
$headers = $this->_get_common_headers( $compression_header );
$this->_headers( $headers );
}
// remove cached entries if its not cached anymore
if ( $this->cache_reject_reason ) {
if ( $this->_old_exists ) {
$cache = $this->_get_cache();
$mobile_group = $this->_page_key_extension['useragent'];
$referrer_group = $this->_page_key_extension['referrer'];
$encryption = $this->_page_key_extension['encryption'];
$compressions_to_store = $this->_get_compressions();
foreach ( $compressions_to_store as $_compression ) {
$_page_key = $this->_get_page_key(
array_merge( $this->_page_key_extension,
array( 'compression' => $_compression ) ) );
$cache->hard_delete( $_page_key );
}
}
}
}
/**
* We can't capture output in ob_callback
* so we use shutdown function
*/
if ( $has_dynamic ) {
$this->_shutdown_buffer = $buffer;
$buffer = '';
register_shutdown_function( array(
$this,
'shutdown'
) );
}
return $buffer;
}
/**
* Shutdown callback
*
* @return void
*/
public function shutdown() {
$compression = $this->_page_key_extension['compression'];
// Parse dynamic content
$buffer = $this->_parse_dynamic( $this->_shutdown_buffer );
// Compress page according to headers already set
echo $this->_compress( $buffer, $compression );
}
/**
* Checks if can we do cache logic
*
* @return boolean
*/
private function _can_cache() {
/**
* Don't cache in console mode
*/
if ( PHP_SAPI === 'cli' ) {
$this->cache_reject_reason = 'Console mode';
return false;
}
/**
* Skip if session defined
*/
if ( defined( 'SID' ) && SID != '' ) {
$this->cache_reject_reason = 'Session started';
return false;
}
if ( !$this->_config->get_boolean('pgcache.cache.ssl') && Util_Environment::is_https() ) {
$this->cache_reject_reason = 'SSL caching disabled';
return false;
}
/**
* Skip if posting
*/
if ( isset( $_SERVER['REQUEST_METHOD'] ) && in_array( strtoupper( $_SERVER['REQUEST_METHOD'] ), array( 'DELETE', 'PUT', 'OPTIONS', 'TRACE', 'CONNECT', 'POST' ) ) ) {
$this->cache_reject_reason = sprintf( 'Requested method is %s', $_SERVER['REQUEST_METHOD'] );
return false;
}
/**
* Skip if HEAD request
*/
if ( isset( $_SERVER['REQUEST_METHOD'] ) && strtoupper( $_SERVER['REQUEST_METHOD'] ) == 'HEAD' &&
( $this->_enhanced_mode || $this->_config->get_boolean( 'pgcache.reject.request_head' ) ) ) {
$this->cache_reject_reason = 'Requested method is HEAD';
return false;
}
/**
* Skip if there is query in the request uri
*/
if ( !$this->_check_query_string() &&
( !$this->_config->get_boolean( 'pgcache.cache.query' ) ||
$this->_config->get_string( 'pgcache.engine' ) == 'file_generic' ) &&
strstr( $this->_request_uri, '?' ) !== false ) {
$this->cache_reject_reason = 'Requested URI contains query';
return false;
}
/**
* Check request URI
*/
if ( !$this->_passed_accept_files() && !$this->_passed_reject_uri() ) {
$this->cache_reject_reason = 'Requested URI is rejected';
return false;
}
/**
* Check User Agent
*/
if ( !$this->_check_ua() ) {
$this->cache_reject_reason = 'User agent is rejected';
return false;
}
/**
* Check WordPress cookies
*/
if ( !$this->_check_cookies() ) {
$this->cache_reject_reason = 'Cookie is rejected';
return false;
}
/**
* Skip if user is logged in or user role is logged in
*/
if ( $this->_config->get_boolean( 'pgcache.reject.logged' ) ) {
if ( !$this->_check_logged_in() ) {
$this->cache_reject_reason = 'User is logged in';
return false;
}
} else {
if ( !$this->_check_logged_in_role_allowed() ) {
$this->cache_reject_reason = 'Rejected user role is logged in';
return false;
}
}
return true;
}
/**
* Checks if can we do cache logic
*
* @param string $buffer
* @return boolean
*/
private function _can_cache2( $buffer ) {
/**
* Skip if caching is disabled
*/
if ( !$this->_caching ) {
return false;
}
/**
* Check for database error
*/
if ( Util_Content::is_database_error( $buffer ) ) {
$this->cache_reject_reason = 'Database error occurred';
return false;
}
/**
* Check for DONOTCACHEPAGE constant
*/
if ( defined( 'DONOTCACHEPAGE' ) && DONOTCACHEPAGE ) {
$this->cache_reject_reason = 'DONOTCACHEPAGE constant is defined';
return false;
}
/**
* Don't cache 404 pages
*/
if ( !$this->_config->get_boolean( 'pgcache.cache.404' ) && function_exists( 'is_404' ) && is_404() ) {
$this->cache_reject_reason = 'Page is 404';
return false;
}
/**
* Don't cache homepage
*/
if ( !$this->_config->get_boolean( 'pgcache.cache.home' ) && function_exists( 'is_home' ) && is_home() ) {
$this->cache_reject_reason = is_front_page() && is_home() ? 'Page is front page' : 'Page is posts page';
return false;
}
/**
* Don't cache front page
*/
if ( $this->_config->get_boolean( 'pgcache.reject.front_page' ) && function_exists( 'is_front_page' ) && is_front_page() && !is_home() ) {
$this->cache_reject_reason = 'Page is front page';
return false;
}
/**
* Don't cache feed
*/
if ( !$this->_config->get_boolean( 'pgcache.cache.feed' ) && function_exists( 'is_feed' ) && is_feed() ) {
$this->cache_reject_reason = 'Page is feed';
return false;
}
/**
* Check if page contains dynamic tags
*/
if ( $this->_enhanced_mode && $this->_has_dynamic( $buffer ) ) {
$this->cache_reject_reason = 'Page contains dynamic tags (mfunc or mclude) can not be cached in enhanced mode';
return false;
}
if ( !$this->_passed_accept_files() ) {
if ( is_single() ) {
/**
* Don't cache pages associated with categories
*/
if ( $this->_passed_reject_categories() ) {
$this->cache_reject_reason = 'Page associated with a rejected category';
return false;
}
/**
* Don't cache pages that use tags
*/
if ( $this->_passed_reject_tags() ) {
$this->cache_reject_reason = 'Page using a rejected tag';
return false;
}
}
/**
* Don't cache pages by these authors
*/
if ( $this->_passed_reject_authors() ) {
$this->cache_reject_reason = 'Page written by a rejected author';
return false;
}
/**
* Don't cache pages using custom fields
*/
if ( $this->_passed_reject_custom_fields() ) {
$this->cache_reject_reason = 'Page using a rejected custom field';
return false;
}
}
return true;
}
public function get_cache_stats_size( $timeout_time ) {
$cache = $this->_get_cache();
if ( method_exists( $cache, 'get_stats_size' ) )
return $cache->get_stats_size( $timeout_time );
return null;
}
public function get_usage_statistics_cache_config() {
$engine = $this->_config->get_string( 'pgcache.engine' );
switch ( $engine ) {
case 'memcached':
$engineConfig = array(
'servers' => $this->_config->get_array( 'pgcache.memcached.servers' ),
'persistent' => $this->_config->get_boolean( 'pgcache.memcached.persistent' ),
'aws_autodiscovery' => $this->_config->get_boolean( 'pgcache.memcached.aws_autodiscovery' ),
'username' => $this->_config->get_string( 'pgcache.memcached.username' ),
'password' => $this->_config->get_string( 'pgcache.memcached.password' )
);
break;
case 'redis':
$engineConfig = array(
'servers' => $this->_config->get_array( 'pgcache.redis.servers' ),
'persistent' => $this->_config->get_boolean( 'pgcache.redis.persistent' ),
'dbid' => $this->_config->get_integer( 'pgcache.redis.dbid' ),
'password' => $this->_config->get_string( 'pgcache.redis.password' )
);
break;
case 'file_generic':
$engine = 'file';
break;
default:
$engineConfig = array();
}
$engineConfig['engine'] = $engine;
return $engineConfig;
}
/**
* Returns cache object
*
* @return W3_Cache_Base
*/
function _get_cache() {
static $cache = null;
if ( is_null( $cache ) ) {
$engine = $this->_config->get_string( 'pgcache.engine' );
switch ( $engine ) {
case 'memcached':
$engineConfig = array(
'servers' => $this->_config->get_array( 'pgcache.memcached.servers' ),
'persistent' => $this->_config->get_boolean( 'pgcache.memcached.persistent' ),
'aws_autodiscovery' => $this->_config->get_boolean( 'pgcache.memcached.aws_autodiscovery' ),
'username' => $this->_config->get_string( 'pgcache.memcached.username' ),
'password' => $this->_config->get_string( 'pgcache.memcached.password' )
);
break;
case 'redis':
$engineConfig = array(
'servers' => $this->_config->get_array( 'pgcache.redis.servers' ),
'persistent' => $this->_config->get_boolean( 'pgcache.redis.persistent' ),
'dbid' => $this->_config->get_integer( 'pgcache.redis.dbid' ),
'password' => $this->_config->get_string( 'pgcache.redis.password' )
);
break;
case 'file':
$engineConfig = array(
'section' => 'page',
'flush_parent' => ( Util_Environment::blog_id() == 0 ),
'locking' => $this->_config->get_boolean( 'pgcache.file.locking' ),
'flush_timelimit' => $this->_config->get_integer( 'timelimit.cache_flush' )
);
break;
case 'file_generic':
if ( Util_Environment::blog_id() == 0 )
$flush_dir = W3TC_CACHE_PAGE_ENHANCED_DIR;
else
$flush_dir = W3TC_CACHE_PAGE_ENHANCED_DIR . '/' . Util_Environment::host();
$engineConfig = array(
'exclude' => array(
'.htaccess'
),
'expire' => $this->_lifetime,
'cache_dir' => W3TC_CACHE_PAGE_ENHANCED_DIR,
'locking' => $this->_config->get_boolean( 'pgcache.file.locking' ),
'flush_timelimit' => $this->_config->get_integer( 'timelimit.cache_flush' ),
'flush_dir' => $flush_dir,
);
break;
default:
$engineConfig = array();
}
$engineConfig['use_expired_data'] = true;
$engineConfig['module'] = 'pgcache';
$engineConfig['host'] = ''; // host is always put to a key
$engineConfig['instance_id'] = Util_Environment::instance_id();
$cache = Cache::instance( $engine, $engineConfig );
}
return $cache;
}
/**
* Checks request URI
*
* @return boolean
*/
function _passed_reject_uri() {
$auto_reject_uri = array(
'wp-login',
'wp-register'
);
foreach ( $auto_reject_uri as $uri ) {
if ( strstr( $this->_request_uri, $uri ) !== false ) {
return false;
}
}
$reject_uri = $this->_config->get_array( 'pgcache.reject.uri' );
$reject_uri = array_map( array( '\W3TC\Util_Environment', 'parse_path' ), $reject_uri );
foreach ( $reject_uri as $expr ) {
$expr = trim( $expr );
if ( $expr != '' && preg_match( '~' . $expr . '~i', $this->_request_uri ) ) {
return false;
}
}
return true;
}
/**
* Check if in the cache exception list
*
* @return boolean
*/
function _passed_accept_files() {
$accept_uri = $this->_config->get_array( 'pgcache.accept.files' );
$accept_uri = array_map( array( '\W3TC\Util_Environment', 'parse_path' ), $accept_uri );
foreach ( $accept_uri as &$val ) $val = trim( str_replace( "~", "\~", $val ) );
$accept_uri = array_filter( $accept_uri, function( $val ){ return $val != ""; } );
if ( !empty( $accept_uri ) && @preg_match( '~' . implode( "|", $accept_uri ) . '~i', $this->_request_uri ) ) {
return true;
}
return false;
}
/**
* Checks page against rejected categories
*
* @return boolean
*/
function _passed_reject_categories() {
$reject_categories = $this->_config->get_array( 'pgcache.reject.categories' );
if ( !empty( $reject_categories ) ) {
if ( $cats = get_the_category() ) {
foreach( $cats as $cat ) {
if ( in_array( $cat->slug, $reject_categories ) ) {
return true;
}
}
}
}
return false;
}
/**
* Checks page against rejected tags
*
* @return boolean
*/
function _passed_reject_tags() {
$reject_tags = $this->_config->get_array( 'pgcache.reject.tags' );
if ( !empty( $reject_tags ) ) {
if ( $tags = get_the_tags() ) {
foreach( $tags as $tag ) {
if ( in_array( $tag->slug,$reject_tags ) ) {
return true;
}
}
}
}
return false;
}
/**
* Checks page against rejected authors
*
* @return boolean
*/
function _passed_reject_authors() {
$reject_authors = $this->_config->get_array( 'pgcache.reject.authors' );
if ( !empty( $reject_authors ) ) {
if ( $author = get_the_author_meta( 'user_login' ) ) {
if ( in_array( $author, $reject_authors ) ) {
return true;
}
}
}
return false;
}
/**
* Checks page against rejected custom fields
*
* @return boolean
*/
function _passed_reject_custom_fields() {
$reject_custom = $this->_config->get_array( 'pgcache.reject.custom' );
if ( empty( $reject_custom ) )
return false;
foreach ( $reject_custom as &$val ) {
$val = preg_quote( trim( $val ), '~' );
}
$reject_custom = implode( '|', array_filter( $reject_custom ) );
if ( !empty( $reject_custom ) ) {
if ( $customs = get_post_custom() ) {
foreach ( $customs as $key => $value ) {
if ( @preg_match( '~' . $reject_custom . '~i', $key . ( isset( $value[0] ) ? "={$value[0]}" : "" ) ) ) {
return true;
}
}
}
}
return false;
}
/**
* Checks User Agent
*
* @return boolean
*/
function _check_ua() {
$uas = $this->_config->get_array( 'pgcache.reject.ua' );
$uas = array_merge( $uas, array( W3TC_POWERED_BY ) );
foreach ( $uas as $ua ) {
if ( !empty( $ua ) ) {
if ( isset( $_SERVER['HTTP_USER_AGENT'] ) &&
stristr( $_SERVER['HTTP_USER_AGENT'], $ua ) !== false )
return false;
}
}
return true;
}
/**
* Checks WordPress cookies
*
* @return boolean
*/
function _check_cookies() {
foreach ( array_keys( $_COOKIE ) as $cookie_name ) {
if ( $cookie_name == 'wordpress_test_cookie' ) {
continue;
}
if ( preg_match( '/^(wp-postpass|comment_author)/', $cookie_name ) ) {
return false;
}
}
foreach ( $this->_config->get_array( 'pgcache.reject.cookie' ) as $reject_cookie ) {
if ( !empty( $reject_cookie ) ) {
foreach ( array_keys( $_COOKIE ) as $cookie_name ) {
if ( strstr( $cookie_name, $reject_cookie ) !== false ) {
return false;
}
}
}
}
return true;
}
/**
* Check if user is logged in
*
* @return boolean
*/
function _check_logged_in() {
foreach ( array_keys( $_COOKIE ) as $cookie_name ) {
if ( strpos( $cookie_name, 'wordpress_logged_in' ) === 0 )
return false;
}
return true;
}
/**
* Check if logged in user role is allwed to be cached
*
* @return boolean
*/
function _check_logged_in_role_allowed() {
if ( !$this->_config->get_boolean( 'pgcache.reject.logged_roles' ) )
return true;
$roles = $this->_config->get_array( 'pgcache.reject.roles' );
if ( empty( $roles ) )
return true;
foreach ( array_keys( $_COOKIE ) as $cookie_name ) {
if ( strpos( $cookie_name, 'w3tc_logged_' ) === 0 ) {
foreach ( $roles as $role ) {
if ( strstr( $cookie_name, md5( NONCE_KEY . $role ) ) )
return false;
}
}
}
return true;
}
/**
* Checks if rules file present and creates it if not
*/
function _check_rules_present() {
if ( Util_Environment::is_nginx() )
return; // nginx store it in a single file
$filename = Util_Rule::get_pgcache_rules_cache_path();
if ( file_exists( $filename ) )
return;
// we call it as little times as possible
// its expensive, but have to restore lost .htaccess file
$e = Dispatcher::component( 'PgCache_Environment' );
try {
$e->fix_on_wpadmin_request( $this->_config, true );
} catch ( \Exception $ex ) {
}
}
/**
* Compress data
*
* @param string $data
* @param string $compression
* @return string
*/
function _compress( $data, $compression ) {
switch ( $compression ) {
case 'gzip':
$data = gzencode( $data );
break;
case 'deflate':
$data = gzdeflate( $data );
break;
}
return $data;
}
/**
* Returns page key extension for current request
*
* @return string
*/
private function _get_key_extension() {
$extension = array(
'useragent' => '',
'referrer' => '',
'cookie' => '',
'encryption' => '',
'compression' => $this->_get_compression(),
'content_type' => '',
'cache' => true,
'cache_reject_reason' => '',
);
if ( $this->_mobile )
$extension['useragent'] = $this->_mobile->get_group();
if ( $this->_referrer )
$extension['referrer'] = $this->_referrer->get_group();
if ( Util_Environment::is_https() )
$extension['encryption'] = 'ssl';
$this->_fill_key_extension_cookie( $extension );
return $extension;
}
private function _fill_key_extension_cookie( &$extension ) {
if ( !$this->_config->get_boolean( 'pgcache.cookiegroups.enabled' ) )
return;
$groups = $this->_config->get_array( 'pgcache.cookiegroups.groups' );
foreach ( $groups as $group_name => $g ) {
if ( isset( $g['enabled'] ) && $g['enabled'] ) {
$cookies = array();
foreach ($g['cookies'] as $cookie ) {
$cookie = trim( $cookie );
if ( !empty( $cookie ) ) {
$cookie = str_replace( '+', ' ', $cookie );
$cookie = Util_Environment::preg_quote( $cookie );
if ( strpos( $cookie, '=') === false )
$cookie .= '=.*';
$cookies[] = $cookie;
}
}
if ( count( $cookies ) > 0 ) {
$cookies_regexp = '~^(' . implode( '|', $cookies ) . ')$~i';
foreach ( $_COOKIE as $key => $value ) {
if ( @preg_match( $cookies_regexp, $key . '=' . $value ) ) {
$extension['cookie'] = $group_name;
if ( !$g['cache'] ) {
$extension['cache'] = false;
$extension['cache_reject_reason'] = 'cookiegroup ' . $group_name;
}
return;
}
}
}
}
}
}
/**
* Returns current compression
*
* @return boolean
*/
function _get_compression() {
if ( $this->_debug ) // cannt generate/use compressed files during debug mode
return '';
if ( !Util_Environment::is_zlib_enabled() && !$this->_is_buggy_ie() ) {
$compressions = $this->_get_compressions();
foreach ( $compressions as $compression ) {
if ( is_string( $compression ) &&
isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) &&
stristr( $_SERVER['HTTP_ACCEPT_ENCODING'], $compression ) !== false ) {
return $compression;
}
}
}
return '';
}
/**
* Returns array of compressions
*
* @return array
*/
function _get_compressions() {
$compressions = array(
false
);
if ( $this->_config->get_boolean( 'browsercache.enabled' ) &&
$this->_config->get_boolean( 'browsercache.html.compression' ) &&
function_exists( 'gzencode' ) ) {
$compressions[] = 'gzip';
}
return $compressions;
}
/**
* Returns array of response headers
*
* @return array
*/
function _get_response_headers() {
$headers_kv = array();
$headers_plain = array();
if ( function_exists( 'headers_list' ) ) {
$headers_list = headers_list();
if ( $headers_list ) {
foreach ( $headers_list as $header ) {
$pos = strpos( $header, ':' );
if ( $pos ) {
$header_name = substr( $header, 0, $pos );
$header_value = substr( $header, $pos + 1 );
} else {
$header_name = $header;
$header_value = '';
}
$headers_kv[$header_name] = $header_value;
$headers_plain[] = array(
'name' => $header_name,
'value' => $header_value
);
}
}
}
return array(
'kv' => $headers_kv,
'plain' => $headers_plain
);
}
/**
* Checks for buggy IE6 that doesn't support compression
*
* @return boolean
*/
function _is_buggy_ie() {
if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
$ua = $_SERVER['HTTP_USER_AGENT'];
if ( strpos( $ua, 'Mozilla/4.0 (compatible; MSIE ' ) === 0 && strpos( $ua, 'Opera' ) === false ) {
$version = (float) substr( $ua, 30 );
return $version < 6 || ( $version == 6 && strpos( $ua, 'SV1' ) === false );
}
}
return false;
}
/**
* Returns array of data headers
*
* @return array
*/
function _get_cached_headers( $response_headers ) {
$data_headers = array();
$cache_headers = array_merge(
array( 'Location' ),
$this->_config->get_array( 'pgcache.cache.headers' )
);
if ( function_exists( 'http_response_code' ) ) { // php5.3 compatibility
$data_headers['Status-Code'] = http_response_code();
}
$repeating_headers = array(
'link',
'cookie',
'set-cookie'
);
$repeating_headers = apply_filters( 'w3tc_repeating_headers',
$repeating_headers );
foreach ( $response_headers as $i ) {
$header_name = $i['name'];
$header_value = $i['value'];
foreach ( $cache_headers as $cache_header_name ) {
if ( strcasecmp( $header_name, $cache_header_name ) == 0 ) {
$header_name_lo = strtolower( $header_name );
if ( in_array($header_name_lo, $repeating_headers) ) {
// headers may repeat
$data_headers[] = array(
'n' => $header_name,
'v' => $header_value
);
} else {
$data_headers[$header_name] = $header_value;
}
}
}
}
return $data_headers;
}
/**
* Returns page key
*
* @return string
*/
function _get_page_key( $page_key_extension, $request_url = '' ) {
if ( $request_url ) {
$parts = parse_url( $request_url );
$key = $parts['host'] .
( isset( $parts['path'] ) ? $parts['path'] : '' ) .
( isset( $parts['query'] ) ? '?' . $parts['query'] : '' );
} else
$key = $this->_request_host . $this->_request_uri;
// replace fragment
$key = preg_replace( '~#.*$~', '', $key );
$key = strtolower( $key ); // host/uri in different cases means the same page in wp
if ( $this->_enhanced_mode ) {
// URL decode
$key = urldecode( $key );
// replace double slashes
$key = preg_replace( '~[/\\\]+~', '/', $key );
// replace query string
$key = preg_replace( '~\?.*$~', '', $key );
// replace index.php
$key = str_replace( '/index.php', '/', $key );
// trim slash
$key = ltrim( $key, '/' );
if ( $key && substr( $key, -1 ) != '/' ) {
$key .= '/';
}
$key .= '_index';
} else {
if ( $this->_check_query_string() )
// replace query string
$key = preg_replace( '~\?.*$~', '', $key );
$key = md5( $key );
}
/**
* Append extensions
*/
if ( !empty( $page_key_extension['useragent'] ) )
$key .= '_' . $page_key_extension['useragent'];
if ( !empty( $page_key_extension['referrer'] ) )
$key .= '_' . $page_key_extension['referrer'];
if ( !empty( $page_key_extension['cookie'] ) )
$key .= '_' . $page_key_extension['cookie'];
if ( !empty( $page_key_extension['encryption'] ) )
$key .= '_' . $page_key_extension['encryption'];
if ( Util_Environment::is_preview_mode() )
$key .= '_preview';
if ( $this->_enhanced_mode ) {
$key_postfix = '.html';
if ( $this->_config->get_boolean( 'pgcache.cache.nginx_handle_xml' ) ) {
$content_type = isset( $page_key_extension['content_type'] ) ?
$page_key_extension['content_type'] : '';
if ( @preg_match( "~(text/xml|text/xsl|application/rdf\+xml|application/rss\+xml|application/atom\+xml)~i", $content_type ) ||
strpos( $this->_request_uri, "/feed/" ) !== false ||
strpos( $this->_request_uri, ".xsl" ) !== false ) {
$key_postfix = '.xml';
}
}
$key .= $key_postfix;
}
/**
* Append compression
*/
if ( $page_key_extension['compression'] )
$key .= '_' . $page_key_extension['compression'];
return $key;
}
/**
* Returns debug info
*
* @param boolean $cache
* @param string $reason
* @param boolean $status
* @param double $time
* @return string
*/
public function w3tc_footer_comment( $strings ) {
$strings[] = sprintf(
__( 'Page Caching using %s%s%s', 'w3-total-cache' ),
Cache::engine_name( $this->_config->get_string( 'pgcache.engine' ) ),
'{w3tc_pagecache_reject_reason}',
isset($this->_page_key_extension['cookie']) ? ' ' . $this->_page_key_extension['cookie'] : '' );
if ( $this->_debug ) {
$time_total = Util_Debug::microtime() - $this->_time_start;
$engine = $this->_config->get_string( 'pgcache.engine' );
$strings[] = '';
$strings[] = 'Page cache debug info:';
$strings[] = sprintf( "%s%s", str_pad( 'Engine: ', 20 ), Cache::engine_name( $engine ) );
$strings[] = sprintf( "%s%s", str_pad( 'Cache key: ', 20 ), $this->_page_key );
$strings[] = sprintf( "%s%.3fs", str_pad( 'Creation Time: ', 20 ), time() );
$headers = $this->_get_response_headers();
if ( count( $headers['plain'] ) ) {
$strings[] = "Header info:";
foreach ( $headers['plain'] as $i ) {
$strings[] = sprintf( "%s%s",
str_pad( $i['name'] . ': ', 20 ),
Util_Content::escape_comment( $i['value'] ) );
}
}
$strings[] = '';
}
return $strings;
}
/**
* Sends headers
*
* @param array $headers
* @return boolean
*/
function _headers( $headers ) {
if ( headers_sent() )
return false;
$repeating = array();
// headers are sent as name->value and array(n=>, v=>)
// to support repeating headers
foreach ( $headers as $name0 => $value0 ) {
if ( is_array( $value0 ) && isset( $value0['n'] ) ) {
$name = $value0['n'];
$value = $value0['v'];
} else {
$name = $name0;
$value = $value0;
}
if ( $name == 'Status' ) {
@header( $headers['Status'] );
} elseif ( $name == 'Status-Code' ) {
if ( function_exists( 'http_response_code' ) ) // php5.3 compatibility)
@http_response_code( $headers['Status-Code'] );
} elseif ( !empty( $name ) && !empty( $value ) ) {
@header( $name . ': ' . $value, !isset( $repeating[$name] ) );
$repeating[$name] = true;
}
}
return true;
}
/**
* Sends headers
*
* @param boolean $is_404
* @param string $etag
* @param integer $time
* @param string $compression
* @param array $custom_headers
* @return boolean
*/
function _send_headers( $is_404, $time, $etag, $compression, $custom_headers = array() ) {
$exit = false;
$headers = ( is_array( $custom_headers ) ? $custom_headers : array() );
$curr_time = time();
$bc_lifetime = $this->_config->get_integer(
'browsercache.html.lifetime' );
$expires = ( is_null( $time ) ? $curr_time : $time ) + $bc_lifetime;
$max_age = ( $expires > $curr_time ? $expires - $curr_time : 0 );
if ( $is_404 ) {
/**
* Add 404 header
*/
$headers['Status'] = 'HTTP/1.1 404 Not Found';
} elseif ( ( !is_null( $time ) && $this->_check_modified_since( $time ) ) || $this->_check_match( $etag ) ) {
/**
* Add 304 header
*/
$headers['Status'] = 'HTTP/1.1 304 Not Modified';
/**
* Don't send content if it isn't modified
*/
$exit = true;
}
if ( $this->_config->get_boolean( 'browsercache.enabled' ) ) {
if ( $this->_config->get_boolean( 'browsercache.html.last_modified' ) ) {
$headers['Last-Modified'] = Util_Content::http_date( $time );
}
if ( $this->_config->get_boolean( 'browsercache.html.expires' ) ) {
$headers['Expires'] = Util_Content::http_date( $expires );
}
if ( $this->_config->get_boolean( 'browsercache.html.cache.control' ) ) {
switch ( $this->_config->get_string( 'browsercache.html.cache.policy' ) ) {
case 'cache':
$headers['Pragma'] = 'public';
$headers['Cache-Control'] = 'public';
break;
case 'cache_public_maxage':
$headers['Pragma'] = 'public';
$headers['Cache-Control'] = sprintf( 'max-age=%d, public', $max_age );
break;
case 'cache_validation':
$headers['Pragma'] = 'public';
$headers['Cache-Control'] = 'public, must-revalidate, proxy-revalidate';
break;
case 'cache_noproxy':
$headers['Pragma'] = 'public';
$headers['Cache-Control'] = 'private, must-revalidate';
break;
case 'cache_maxage':
$headers['Pragma'] = 'public';
$headers['Cache-Control'] = sprintf( 'max-age=%d, public, must-revalidate, proxy-revalidate', $max_age );
break;
case 'no_cache':
$headers['Pragma'] = 'no-cache';
$headers['Cache-Control'] = 'max-age=0, private, no-store, no-cache, must-revalidate';
break;
}
}
if ( $this->_config->get_boolean( 'browsercache.html.etag' ) ) {
$headers['ETag'] = '"' . $etag . '"';
}
}
$headers = array_merge( $headers,
$this->_get_common_headers( $compression ) );
/**
* Send headers to client
*/
$result = $this->_headers( $headers );
if ( $exit )
exit();
return $result;
}
/**
* Returns headers to send regardless is page caching is active
*/
function _get_common_headers( $compression ) {
$headers = array();
if ( $this->_config->get_boolean( 'browsercache.enabled' ) ) {
if ( $this->_config->get_boolean( 'browsercache.html.w3tc' ) ) {
$headers['X-Powered-By'] = Util_Environment::w3tc_header();
}
}
$vary = '';
//compressed && UAG
if ( $compression && $this->_page_key_extension['useragent'] ) {
$vary = 'Accept-Encoding,User-Agent,Cookie';
$headers['Content-Encoding'] = $compression;
//compressed
} elseif ( $compression ) {
$vary = 'Accept-Encoding';
$headers['Content-Encoding'] = $compression;
//uncompressed && UAG
} elseif ( $this->_page_key_extension['useragent'] ) {
$vary = 'User-Agent,Cookie';
}
//Add Cookie to vary if user logged in and not previously set
if ( !$this->_check_logged_in() && strpos( $vary, 'Cookie' ) === false ) {
if ( $vary )
$vary .= ',Cookie';
else
$vary = 'Cookie';
}
/**
* Add vary header
*/
if ( $vary )
$headers['Vary'] = $vary;
/**
* Disable caching for preview mode
*/
if ( Util_Environment::is_preview_mode() ) {
$headers['Pragma'] = 'private';
$headers['Cache-Control'] = 'private';
}
return $headers;
}
/**
* Check if content was modified by time
*
* @param integer $time
* @return boolean
*/
function _check_modified_since( $time ) {
if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
$if_modified_since = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
// IE has tacked on extra data to this header, strip it
if ( ( $semicolon = strrpos( $if_modified_since, ';' ) ) !== false ) {
$if_modified_since = substr( $if_modified_since, 0, $semicolon );
}
return $time == strtotime( $if_modified_since );
}
return false;
}
/**
* Check if content was modified by etag
*
* @param string $etag
* @return boolean
*/
function _check_match( $etag ) {
if ( !empty( $_SERVER['HTTP_IF_NONE_MATCH'] ) ) {
$if_none_match = ( get_magic_quotes_gpc() ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : $_SERVER['HTTP_IF_NONE_MATCH'] );
$client_etags = explode( ',', $if_none_match );
foreach ( $client_etags as $client_etag ) {
$client_etag = trim( $client_etag );
if ( $etag == $client_etag ) {
return true;
}
}
}
return false;
}
/**
* Bad Behavior support
*
* @return void
*/
function _bad_behavior() {
$bb_file = $this->_config->get_string( 'pgcache.bad_behavior_path' );
if ( $bb_file != '' )
require_once $bb_file;
}
/**
* Parses dynamic tags
*/
function _parse_dynamic( $buffer ) {
if ( !defined( 'W3TC_DYNAMIC_SECURITY' ) )
return $buffer;
$buffer = preg_replace_callback( '~<!--\s*mfunc\s*' . W3TC_DYNAMIC_SECURITY . '(.*)-->(.*)<!--\s*/mfunc\s*' . W3TC_DYNAMIC_SECURITY . '\s*-->~Uis', array(
$this,
'_parse_dynamic_mfunc'
), $buffer );
$buffer = preg_replace_callback( '~<!--\s*mclude\s*' . W3TC_DYNAMIC_SECURITY . '(.*)-->(.*)<!--\s*/mclude\s*' . W3TC_DYNAMIC_SECURITY . '\s*-->~Uis', array(
$this,
'_parse_dynamic_mclude'
), $buffer );
return $buffer;
}
/**
* Parse dynamic mfunc callback
*
* @param array $matches
* @return string
*/
function _parse_dynamic_mfunc( $matches ) {
$code1 = trim( $matches[1] );
$code2 = trim( $matches[2] );
$code = ( $code1 ? $code1 : $code2 );
if ( $code ) {
$code = trim( $code, ';' ) . ';';
try {
ob_start();
$result = eval( $code );
$output = ob_get_contents();
ob_end_clean();
} catch ( \Exception $ex ) {
$result = false;
}
if ( $result === false ) {
$output = sprintf( 'Unable to execute code: %s', htmlspecialchars( $code ) );
}
} else {
$output = htmlspecialchars( 'Invalid mfunc tag syntax. The correct format is: <!-- W3TC_DYNAMIC_SECURITY mfunc PHP code --><!-- /mfunc W3TC_DYNAMIC_SECURITY --> or <!-- W3TC_DYNAMIC_SECURITY mfunc -->PHP code<!-- /mfunc W3TC_DYNAMIC_SECURITY -->.' );
}
return $output;
}
/**
* Parse dynamic mclude callback
*
* @param array $matches
* @return string
*/
function _parse_dynamic_mclude( $matches ) {
$file1 = trim( $matches[1] );
$file2 = trim( $matches[2] );
$file = ( $file1 ? $file1 : $file2 );
if ( $file ) {
$file = ABSPATH . $file;
if ( file_exists( $file ) && is_readable( $file ) ) {
ob_start();
include $file;
$output = ob_get_contents();
ob_end_clean();
} else {
$output = sprintf( 'Unable to open file: %s', htmlspecialchars( $file ) );
}
} else {
$output = htmlspecialchars( 'Incorrect mclude tag syntax. The correct format is: <!-- mclude W3TC_DYNAMIC_SECURITY path/to/file.php --><!-- /mclude W3TC_DYNAMIC_SECURITY --> or <!-- mclude W3TC_DYNAMIC_SECURITY -->path/to/file.php<!-- /mclude W3TC_DYNAMIC_SECURITY -->.' );
}
return $output;
}
/**
* Checks if buffer has dynamic tags
*
* @param string $buffer
* @return boolean
*/
function _has_dynamic( $buffer ) {
if ( !defined( 'W3TC_DYNAMIC_SECURITY' ) )
return false;
return preg_match( '~<!--\s*m(func|clude)\s*' . W3TC_DYNAMIC_SECURITY . '(.*)-->(.*)<!--\s*/m(func|clude)\s*' . W3TC_DYNAMIC_SECURITY . '\s*-->~Uis', $buffer );
}
/**
* Check whether requested page has content type that can be cached
*
* @return bool
*/
private function _is_cacheable_content_type() {
$content_type = '';
$headers = headers_list();
foreach ( $headers as $header ) {
$header = strtolower( $header );
$m = null;
if ( preg_match( '~\s*content-type\s*:([^;]+)~', $header, $m ) ) {
$content_type = trim( $m[1] );
}
}
$cache_headers = apply_filters( 'w3tc_is_cacheable_content_type',
array(
'' /* redirects, they have only Location header set */,
'application/json', 'text/html', 'text/xml', 'text/xsl',
'application/xhtml+xml', 'application/rss+xml',
'application/atom+xml', 'application/rdf+xml'
)
);
return in_array( $content_type, $cache_headers );
}
private function _check_query_string() {
$accept_qs = $this->_config->get_array( 'pgcache.accept.qs' );
Util_Rule::array_trim( $accept_qs );
if ( empty( $accept_qs) ) {
return false;
}
foreach ( $accept_qs as &$val ) {
$val = Util_Environment::preg_quote( str_replace( "+", " ", $val ) );
$val .= ( strpos( $val, '=' ) === false ? '=.*?' : '' );
}
$accept_qs = implode( '|', $accept_qs );
foreach ( $_GET as $key => $value ) {
if ( !@preg_match( '~^(' . $accept_qs . ')$~i', $key . "=$value" ) ) {
return false;
}
}
return true;
}
/**
*
*/
public function delayed_cache_print() {
if ( $this->_late_caching && $this->_caching ) {
$this->_cached_data = $this->_extract_cached_page( true );
if ( $this->_cached_data ) {
global $w3_late_caching_succeeded;
$w3_late_caching_succeeded = true;
$this->process_cached_page_and_exit( $this->_cached_data );
// if is passes here - exit is not possible now and
// will happen on init
return;
}
}
if ( $this->_late_init && $this->_caching ) {
$this->process_cached_page_and_exit( $this->_cached_data );
// if is passes here - exit is not possible now and
// will happen on init
return;
}
}
/**
*
*
* @param unknown $buffer
* @param unknown $has_dynamic
* @return array
*/
private function _maybe_save_cached_result( $buffer, $has_dynamic ) {
if ( empty( $buffer ) ) {
$this->cache_reject_reason = 'Empty response';
return $buffer;
}
$mobile_group = $this->_page_key_extension['useragent'];
$referrer_group = $this->_page_key_extension['referrer'];
$encryption = $this->_page_key_extension['encryption'];
$compression_header = $this->_page_key_extension['compression'];
$compressions_to_store = $this->_get_compressions();
/**
* Don't compress here for debug mode or dynamic tags
* because we need to modify buffer before send it to client
*/
if ( $this->_debug || $has_dynamic ) {
$compressions_to_store = array( false );
}
// right now dont return compressed buffer if we are dynamic,
// that will happen on shutdown after processing dynamic stuff
$compression_of_returned_content =
( $has_dynamic ? false : $compression_header );
$is_404 = ( function_exists( 'is_404' ) ? is_404() : false );
$response_headers = $this->_get_response_headers();
$headers = $this->_get_cached_headers( $response_headers['plain'] );
if ( !empty( $response_headers['kv']['Content-Encoding'] ) ) {
$this->cache_reject_reason = 'Response is compressed';
return $buffer;
}
if ( $this->_enhanced_mode ) {
// redirect issued, if we have some old cache entries
// they will be turned into fresh files and catch further requests
if ( isset( $response_headers['kv']['Location'] ) ) {
foreach ( $compressions_to_store as $_compression ) {
$_page_key = $this->_get_page_key(
array_merge( $this->_page_key_extension,
array( 'compression' => $_compression ) ) );
$cache = $this->_get_cache();
$cache->hard_delete( $_page_key );
}
return $buffer;
}
}
$content_type = '';
if ( $this->_enhanced_mode && !$this->_late_init ) {
register_shutdown_function( array(
$this,
'_check_rules_present'
) );
if ( isset( $response_headers['kv']['Content-Type'] ) )
$content_type = $response_headers['kv']['Content-Type'];
}
$time = time();
$cache = $this->_get_cache();
/**
* Store different versions of cache
*/
$buffers = array();
$group = '';
if ( !isset( $this->_sitemap_matched ) ) {
$sitemap_regex =
$this->_config->get_string( 'pgcache.purge.sitemap_regex' );
if ( $sitemap_regex && preg_match( '/' . $sitemap_regex . '/', basename( $this->_request_uri ) ) ) {
$group = 'sitemaps';
$this->_sitemap_matched = true;
}
} elseif ( $this->_sitemap_matched )
$group = 'sitemaps';
foreach ( $compressions_to_store as $_compression ) {
$this->_set_extract_page_key(
array_merge( $this->_page_key_extension,
array(
'compression' => $_compression,
'content_type' => $content_type ) ), true );
if ( empty( $this->_page_key ) )
continue;
// Compress content
$buffers[$_compression] = $this->_compress( $buffer, $_compression );
// Store cache data
$_data = array(
'404' => $is_404,
'headers' => $headers,
'time' => $time,
'content' => $buffers[$_compression]
);
if ( $has_dynamic )
$_data['has_dynamic'] = true;
$_data = apply_filters( 'w3tc_pagecache_set', $_data, $this->_page_key );
if ( !empty( $_data ) )
$cache->set( $this->_page_key, $_data, $this->_lifetime, $group );
}
// Change buffer if using compression
if ( defined( 'W3TC_PAGECACHE_OUTPUT_COMPRESSION_OFF' ) ) {
$compression_header = false;
} elseif ( $compression_of_returned_content &&
isset( $buffers[$compression_of_returned_content] ) ) {
$buffer = $buffers[$compression_of_returned_content];
}
// Calculate content etag
$etag = md5( $buffer );
// Send headers
$this->_send_headers( $is_404, $time, $etag, $compression_header,
$headers );
return $buffer;
}
public function w3tc_usage_statistics_of_request( $storage ) {
$storage->counter_add( 'pagecache_requests_total', 1 );
if ( $this->_cached_data )
$storage->counter_add( 'pagecache_requests_hits', 1 );
global $w3tc_start_microtime;
if ( !empty( $w3tc_start_microtime ) ) {
$ms10 = (int)( ( microtime( true ) - $w3tc_start_microtime ) * 100 );
$storage->counter_add( 'pagecache_requests_time_10ms', $ms10 );
}
}
/**
* Log
*/
static private function log( $msg ) {
$data = sprintf( "[%s] [%s] [%s] %s\n", date( 'r' ),
$_SERVER['REQUEST_URI'],
( !empty( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : '-' ),
$msg );
$data = strtr( $data, '<>', '..' );
$filename = Util_Debug::log_filename( 'pagecache' );
return @file_put_contents( $filename, $data, FILE_APPEND );
}
}