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<?php
/**
* File: Dispatcher.php
*
* @package W3TC
*/
namespace W3TC;
/**
* Class Dispatcher
*
* Interplugin communication
*
* phpcs:disable WordPress.PHP.NoSilencedErrors.Discouraged
* phpcs:disable WordPress.WP.AlternativeFunctions
*/
class Dispatcher {
/**
* Instances
*
* @var array
*/
private static $instances = array();
/**
* Retrieves a component instance by class name.
*
* @param string $class_name The class name of the component to retrieve.
*
* @return object The requested component instance.
*/
public static function component( $class_name ) {
if ( ! isset( self::$instances[ $class_name ] ) ) {
$full_class = '\\W3TC\\' . $class_name;
self::$instances[ $class_name ] = new $full_class();
}
$v = self::$instances[ $class_name ]; // Don't return reference.
return $v;
}
/**
* Retrieves the configuration component.
*
* @return object The configuration component instance.
*/
public static function config() {
return self::component( 'Config' );
}
/**
* Resets the configuration component.
*
* @return void
*/
public static function reset_config() {
unset( self::$instances['Config'] );
}
/**
* Retrieves the master configuration instance.
*
* @return object The master configuration instance.
*/
public static function config_master() {
static $config_master = null;
if ( is_null( $config_master ) ) {
$config_master = new Config( 0 );
}
return $config_master;
}
/**
* Retrieves the state-specific configuration instance.
*
* @return object The state-specific configuration instance.
*/
public static function config_state() {
if ( Util_Environment::blog_id() <= 0 ) {
return self::config_state_master();
}
static $config_state = null;
if ( is_null( $config_state ) ) {
$config_state = new ConfigState( false );
}
return $config_state;
}
/**
* Retrieves the master state configuration instance.
*
* @return object The master state configuration instance.
*/
public static function config_state_master() {
static $config_state = null;
if ( is_null( $config_state ) ) {
$config_state = new ConfigState( true );
}
return $config_state;
}
/**
* Retrieves the configuration state note instance.
*
* @return object The configuration state note instance.
*/
public static function config_state_note() {
static $o = null;
if ( is_null( $o ) ) {
$o = new ConfigStateNote( self::config_state_master(), self::config_state() );
}
return $o;
}
/**
* Checks if a given URL has been uploaded to the CDN.
*
* @param string $url The URL to check.
*
* @return bool True if the URL is uploaded to the CDN, false otherwise.
*/
public static function is_url_cdn_uploaded( $url ) {
$minify_enabled = self::config()->get_boolean( 'minify.enabled' );
if ( $minify_enabled ) {
$minify = self::component( 'Minify_MinifiedFileRequestHandler' );
$data = $minify->get_url_custom_data( $url );
if ( is_array( $data ) && isset( $data['cdn.status'] ) && 'uploaded' === $data['cdn.status'] ) {
return true;
}
}
// supported only for minify-based urls, futher is not needed now.
return false;
}
/**
* Creates a file for CDN processing.
*
* @param string $filename The name of the file to create.
*
* @return void
*/
public static function create_file_for_cdn( $filename ) {
$minify_enabled = self::config()->get_boolean( 'minify.enabled' );
if ( $minify_enabled ) {
$minify_document_root = Util_Environment::cache_blog_dir( 'minify' ) . '/';
if ( ! substr( $filename, 0, strlen( $minify_document_root ) ) === $minify_document_root ) {
// unexpected file name.
return;
}
$short_filename = substr( $filename, strlen( $minify_document_root ) );
$minify = self::component( 'Minify_MinifiedFileRequestHandler' );
$data = $minify->process( $short_filename, true );
if ( ! file_exists( $filename ) && isset( $data['content'] ) ) {
if ( ! file_exists( dirname( $filename ) ) ) {
Util_File::mkdir_from_safe( dirname( $filename ), W3TC_CACHE_DIR );
}
}
@file_put_contents( $filename, $data['content'] );
}
}
/**
* Marks a file as uploaded to the CDN.
*
* @param string $file_name The name of the file.
*
* @return void
*/
public static function on_cdn_file_upload( $file_name ) {
$minify_enabled = self::config()->get_boolean( 'minify.enabled' );
if ( $minify_enabled ) {
$minify_document_root = Util_Environment::cache_blog_dir( 'minify' ) . '/';
if ( ! substr( $file_name, 0, strlen( $minify_document_root ) ) === $minify_document_root ) {
// unexpected file name.
return;
}
$short_file_name = substr( $file_name, strlen( $minify_document_root ) );
$minify = self::component( 'Minify_MinifiedFileRequestHandler' );
$minify->set_file_custom_data( $short_file_name, array( 'cdn.status' => 'uploaded' ) );
}
}
/**
* Generates Nginx rules for a browser cache section.
*
* @todo change to filters, like litespeed does
*
* @param object $config The configuration object.
* @param string $section The specific section for which to generate rules.
* @param bool $extra_add_headers_set Whether additional headers are included.
*
* @return array The generated Nginx rules.
*/
public static function nginx_rules_for_browsercache_section( $config, $section, $extra_add_headers_set = false ) {
$rules = array(
'other' => array(),
'add_header' => array(),
);
if ( $config->get_boolean( 'browsercache.enabled' ) ) {
$o = new BrowserCache_Environment_Nginx( $config );
$rules = $o->section_rules( $section, $extra_add_headers_set );
}
if ( ! empty( $rules['add_header'] ) && $config->get_boolean( 'cdn.enabled' ) ) {
$o = new Cdn_Environment_Nginx( $config );
$rule = $o->generate_canonical();
if ( ! empty( $rule ) ) {
$rules['add_header'][] = $rule;
}
}
return array_merge( $rules['other'], $rules['add_header'] );
}
/**
* Retrieves the minify filename requested.
*
* @param object $config The configuration object.
* @param string $file The file name.
*
* @return string The processed file name.
*/
public static function requested_minify_filename( $config, $file ) {
// browsercache may alter filestructure, allow it to remove its uniqualizator.
if ( $config->get_boolean( 'browsercache.enabled' ) &&
$config->get_boolean( 'browsercache.rewrite' ) ) {
if ( preg_match( '~(.+)\.([0-9a-z]+)(\.[^.]+)$~', $file, $m ) ) {
$file = $m[1] . $m[3];
}
}
return $file;
}
/**
* Retrieves the cache instance for usage statistics.
*
* @return object The cache instance for usage statistics.
*/
public static function get_usage_statistics_cache() {
static $cache = null;
if ( is_null( $cache ) ) {
$c = self::config();
$engine_config = null;
if ( $c->getf_boolean( 'objectcache.enabled' ) ) {
$provider = self::component( 'ObjectCache_WpObjectCache_Regular' );
} elseif ( $c->get_boolean( 'dbcache.enabled' ) ) {
$provider = self::component( 'DbCache_Core' );
} elseif ( $c->get_boolean( 'pgcache.enabled' ) ) {
$provider = self::component( 'PgCache_ContentGrabber' );
} elseif ( $c->get_boolean( 'minify.enabled' ) ) {
$provider = self::component( 'Minify_Core' );
} else {
$engine_config = array( 'engine' => 'file' );
}
if ( is_null( $engine_config ) ) {
$engine_config = $provider->get_usage_statistics_cache_config();
}
$engine_config['module'] = 'stats';
$engine_config['blog_id'] = 0; // count wpmu-wide stats.
if ( 'file' === $engine_config['engine'] ) {
$engine_config['cache_dir'] = Util_Environment::cache_dir( 'stats' );
}
$cache = Cache::instance( $engine_config['engine'], $engine_config );
}
return $cache;
}
/**
* Applies usage statistics metrics before initialization and exits.
*
* @param callable $metrics_function The metrics function to apply.
*
* @return void
*/
public static function usage_statistics_apply_before_init_and_exit( $metrics_function ) {
$c = self::config();
if ( ! $c->get_boolean( 'stats.enabled' ) ) {
exit();
}
$core = self::component( 'UsageStatistics_Core' );
$core->apply_metrics_before_init_and_exit( $metrics_function );
}
}