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<?php |
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/** |
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* CDN functionalities |
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* |
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* @package PoweredCache |
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*/ |
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|
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namespace PoweredCache; |
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|
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use \DOMDocument as DOMDocument; |
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use function PoweredCache\Utils\cdn_addresses; |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* Class CDN |
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*/ |
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class CDN { |
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|
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/** |
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* Return an instance of the current class |
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* |
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* @return CDN |
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* @since 1.0 |
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*/ |
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public static function factory() { |
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static $instance = false; |
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|
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if ( ! $instance ) { |
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$instance = new self(); |
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$instance->setup(); |
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} |
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|
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return $instance; |
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} |
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|
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/** |
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* Setup hooks |
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* |
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* @since 1.0 |
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*/ |
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public function setup() { |
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$settings = \PoweredCache\Utils\get_settings(); |
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|
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if ( ! $settings['enable_cdn'] ) { |
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return; |
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} |
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|
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/** |
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* Filters CDN integration |
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* |
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* @hook powered_cache_cdn_disable |
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* |
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* @param {boolean} False by default. |
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* |
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* @return {boolean} New value. |
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* @since 2.1 |
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*/ |
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$disable_cdn = apply_filters( 'powered_cache_cdn_disable', false ); |
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|
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if ( $disable_cdn ) { |
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return; |
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} |
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|
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add_action( 'setup_theme', [ $this, 'start_buffer' ] ); |
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add_filter( 'powered_cache_fo_optimized_url', array( $this, 'cdn_optimizer_url' ), 9999, 2 ); |
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|
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/** |
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* Fires after setup CDN hooks. |
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* |
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* @hook powered_cache_cdn_setup |
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* |
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* @since 1.0 |
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*/ |
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do_action( 'powered_cache_cdn_setup' ); |
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} |
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|
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/** |
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* Start output buffering |
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* |
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* @since 2.2 |
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*/ |
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public function start_buffer() { |
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ob_start( 'self::end_buffering' ); |
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} |
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|
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/** |
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* Replace origin URLs with CDN. |
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* |
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* @param string $contents Output buffer. |
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* @param int $phase Bitmask of PHP_OUTPUT_HANDLER_* constants. |
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* |
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* @return string|string[]|null |
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* @since 2.2 |
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*/ |
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private static function end_buffering( $contents, $phase ) { |
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if ( $phase & PHP_OUTPUT_HANDLER_FINAL || $phase & PHP_OUTPUT_HANDLER_END ) { |
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|
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if ( ! self::skip_cdn_integration() ) { |
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$rewritten_contents = self::rewriter( $contents ); |
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|
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return $rewritten_contents; |
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} |
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} |
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|
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return $contents; |
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} |
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|
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/** |
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* Whether integrate or not integrate CDN. |
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* |
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* @return bool |
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* @since 2.2 |
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*/ |
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private static function skip_cdn_integration() { |
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// check request method |
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if ( ! isset( $_SERVER['REQUEST_METHOD'] ) || 'GET' !== $_SERVER['REQUEST_METHOD'] ) { |
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return true; |
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} |
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|
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// check conditional tags |
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if ( is_admin() || is_trackback() || is_robots() || is_preview() ) { |
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return true; |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Rewrite contents |
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* |
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* @param string $contents HTML Output. |
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* |
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* @return string|string[]|null |
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* @since 2.2 |
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*/ |
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public static function rewriter( $contents ) { |
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// check rewrite requirements |
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if ( ! is_string( $contents ) || empty( self::get_file_extensions() ) ) { |
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return $contents; |
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} |
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|
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$included_file_extensions_regex = quotemeta( implode( '|', self::get_file_extensions() ) ); |
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$urls_regex = '#(?:(?:[\"\'\s=>,;]|url\()\K|^)[^\"\'\s(=>,;]+(' . $included_file_extensions_regex . ')(\?[^\/?\\\"\'\s)>,]+)?(?:(?=\/?[?\\\"\'\s)>,&])|$)#i'; |
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$rewritten_contents = preg_replace_callback( $urls_regex, 'self::rewrite_url', $contents ); |
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|
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return $rewritten_contents; |
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} |
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|
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/** |
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* Rewrite the matched url. |
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* |
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* @param array $matches Matched part of content. |
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* |
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* @return mixed|string |
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* @since 2.2 |
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*/ |
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private static function rewrite_url( $matches ) { |
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$file_url = $matches[0]; |
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$site_hostname = ( ! empty( $_SERVER['HTTP_HOST'] ) ) ? $_SERVER['HTTP_HOST'] : wp_parse_url( home_url(), PHP_URL_HOST ); |
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|
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/** |
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* Filters site hostname(s). |
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* |
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* @hook powered_cache_cdn_site_hostnames |
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* |
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* @param {array} Site hostnames for CDN replacement. |
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* |
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* @return {array} New value. |
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* |
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* @since 2.2 |
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*/ |
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$site_hostnames = (array) apply_filters( 'powered_cache_cdn_site_hostnames', array( $site_hostname ) ); |
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|
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$zone = self::get_zone_by_ext( $matches[1] ); |
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$cdn_hostname = self::get_best_possible_cdn_host( $zone ); |
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if ( empty( $cdn_hostname ) ) { |
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return $file_url; |
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} |
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|
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// if excluded or already using CDN hostname |
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if ( self::is_excluded( $file_url ) || false !== stripos( $file_url, $cdn_hostname ) ) { |
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return $file_url; |
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} |
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|
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// rewrite full URL (e.g. https://www.example.com/wp..., https:\/\/www.example.com\/wp..., or //www.example.com/wp...) |
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foreach ( $site_hostnames as $site_hostname ) { |
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if ( stripos( $file_url, '//' . $site_hostname ) !== false || stripos( $file_url, '\/\/' . $site_hostname ) !== false ) { |
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return substr_replace( $file_url, $cdn_hostname, stripos( $file_url, $site_hostname ), strlen( $site_hostname ) ); |
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} |
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} |
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|
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/** |
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* Filters whether relative urls needs to rewritten or not |
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* |
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* @hook powered_cache_cdn_rewrite_relative_urls |
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* |
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* @param {boolean} true to automatic update. |
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* |
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* @return {boolean} New value. |
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* |
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* @since 2.2 |
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*/ |
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if ( apply_filters( 'powered_cache_cdn_rewrite_relative_urls', true ) ) { // rewrite relative URLs hook |
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// rewrite relative URL (e.g. /wp-content/uploads/example.jpg) |
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if ( strpos( $file_url, '//' ) !== 0 && strpos( $file_url, '/' ) === 0 ) { |
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return '//' . $cdn_hostname . $file_url; |
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} |
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|
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// rewrite escaped relative URL (e.g. \/wp-content\/uploads\/example.jpg) |
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if ( strpos( $file_url, '\/\/' ) !== 0 && strpos( $file_url, '\/' ) === 0 ) { |
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return '\/\/' . $cdn_hostname . $file_url; |
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} |
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} |
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|
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return $file_url; |
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} |
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|
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/** |
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* Check whether given url excluded or not. |
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* |
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* @param string $file_url File URL. |
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* |
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* @return bool |
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* @since 2.2 |
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*/ |
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private static function is_excluded( $file_url ) { |
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$settings = \PoweredCache\Utils\get_settings(); |
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|
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// rejected file |
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if ( ! empty( $settings['cdn_rejected_files'] ) ) { |
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$cdn_rejected_files = preg_split( '#(\r\n|\r|\n)#', $settings['cdn_rejected_files'], - 1, PREG_SPLIT_NO_EMPTY ); |
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$cdn_rejected_files = implode( '|', $cdn_rejected_files ); |
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|
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if ( preg_match( '#(' . $cdn_rejected_files . ')#', $file_url ) ) { |
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return true; |
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} |
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} |
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|
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// don't replace for base64 encoded images |
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if ( false !== strpos( $file_url, 'data:image' ) ) { |
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return true; |
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} |
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|
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return false; |
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} |
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|
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/** |
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* CDN hostname replacement for optimized URLs |
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* |
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* @param string $optimized_url Optimized assets URL |
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* @param string $path rel path of the files |
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* |
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* @return mixed |
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*/ |
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public function cdn_optimizer_url( $optimized_url, $path ) { |
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if ( '-' === $path[0] ) { |
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$path = @gzuncompress( base64_decode( substr( $path, 1 ) ) ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged,WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode |
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} |
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|
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$zone = 'all'; |
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if ( $path && false !== strpos( $path, '.css' ) ) { |
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$zone = 'css'; |
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} elseif ( $path && false !== strpos( $path, '.js' ) ) { |
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$zone = 'js'; |
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} |
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|
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$cdn_hostname = self::get_best_possible_cdn_host( $zone ); |
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$cdn_url = '//' . $cdn_hostname; |
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|
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$optimized_url = str_replace( home_url(), $cdn_url, $optimized_url ); |
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|
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return $optimized_url; |
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} |
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|
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|
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/** |
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* try to catch best cdn address to given zone |
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* |
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* @param string $zone keys of Powered_Cache_Admin_Helper::cdn_zones |
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* |
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* @return mixed string | false |
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*/ |
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public static function get_best_possible_cdn_host( $zone = 'all' ) { |
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global $powered_cache_cdn_addresses; |
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|
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if ( ! isset( $powered_cache_cdn_addresses ) ) { |
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$powered_cache_cdn_addresses = cdn_addresses(); |
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} |
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|
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if ( isset( $powered_cache_cdn_addresses[ $zone ] ) && is_array( $powered_cache_cdn_addresses[ $zone ] ) ) { |
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// if we have multiple host for the same resource get randomly |
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$random_key = array_rand( $powered_cache_cdn_addresses[ $zone ] ); |
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|
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return $powered_cache_cdn_addresses[ $zone ][ $random_key ]; |
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} |
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|
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// fallback to primary host |
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if ( isset( $powered_cache_cdn_addresses['all'] ) && is_array( $powered_cache_cdn_addresses['all'] ) ) { |
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$random_key = array_rand( $powered_cache_cdn_addresses['all'] ); |
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|
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return $powered_cache_cdn_addresses['all'][ $random_key ]; |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Get CDN zone by given extension. |
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* |
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* @param string $ext File extensions. Eg: .jpg, .gif, .mp3... |
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* |
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* @return string |
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* @since 2.2 |
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*/ |
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private static function get_zone_by_ext( $ext ) { |
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$zone = 'all'; |
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|
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/* documented in get_file_extensions */ |
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$image_extensions = apply_filters( 'powered_cache_cdn_image_extensions', array( 'jpg', 'jpeg', 'gif', 'png', 'bmp', 'ico', 'webp', 'avif', 'svg' ) ); |
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$image_extensions = array_map( |
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function ( $ext ) { |
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return '.' . $ext; |
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}, |
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$image_extensions |
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); |
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|
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if ( in_array( $ext, $image_extensions, true ) ) { |
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$zone = 'image'; |
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} elseif ( '.css' === $ext ) { |
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$zone = 'css'; |
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} elseif ( '.js' === $ext ) { |
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$zone = 'js'; |
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} |
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|
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return $zone; |
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} |
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|
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/** |
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* Get the list of supported file extensions for CDN integration. |
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* |
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* @return array|mixed|void |
| 345 |
* @since 2.2 |
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*/ |
| 347 |
public static function get_file_extensions() { |
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/** |
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* Filters supported image extensions. |
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* |
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* @hook powered_cache_cdn_image_extensions |
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* |
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* @param {array} $image_extensions Supported image extensions. |
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* |
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* @return {array} New value. |
| 356 |
* @deprecated since 2.2. Use powered_cache_cdn_extensions instead. |
| 357 |
* @since 1.0 |
| 358 |
*/ |
| 359 |
$image_extensions = apply_filters( 'powered_cache_cdn_image_extensions', array( 'jpg', 'jpeg', 'gif', 'png', 'bmp', 'ico', 'webp', 'avif', 'svg' ) ); |
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|
| 361 |
$extensions = [ 'css', 'js', 'pdf', 'mp3', 'mp4', 'woff2', 'woff', 'ttf', 'otf' ]; |
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|
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$file_extensions = array_map( |
| 364 |
function ( $ext ) { |
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return '.' . $ext; |
| 366 |
}, |
| 367 |
array_merge( $image_extensions, $extensions ) |
| 368 |
); |
| 369 |
|
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/** |
| 371 |
* Filters supported file extensions. |
| 372 |
* |
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* @hook powered_cache_cdn_extensions |
| 374 |
* |
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* @param {array} $file_extensions Supported file extensions. |
| 376 |
* |
| 377 |
* @return {array} New value. |
| 378 |
* @since 2.2 |
| 379 |
*/ |
| 380 |
$file_extensions = apply_filters( 'powered_cache_cdn_extensions', $file_extensions ); |
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|
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return $file_extensions; |
| 383 |
} |
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|
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} |
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|
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|
