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<?php declare(strict_types=1); namespace WP_Rocket\Engine\Media\AboveTheFold\Frontend; use WP_Filesystem_Direct; use WP_Rocket\Admin\Options_Data; use WP_Rocket\Engine\Media\AboveTheFold\Database\Queries\AboveTheFold as ATFQuery; use WP_Rocket\Engine\Media\AboveTheFold\Context\Context; use WP_Rocket\Engine\Optimization\RegexTrait; use WP_Rocket\Engine\Optimization\UrlTrait; class Controller { use RegexTrait; use UrlTrait; /** * Options instance * * @var Options_Data / private $options; /* * Queries instance * * @var ATFQuery / private $query; /* * Context instance. * * @var Context / private $context; /* * WordPress filesystem. * * @var WP_Filesystem_Direct / protected $filesystem; /* * Constructor * * @param Options_Data $options Options instance. * @param ATFQuery $query Queries instance. * @param Context $context Context instance. * @param WP_Filesystem_Direct\|null $filesystem WordPress filesystem. / public function __construct( Options_Data $options, ATFQuery $query, Context $context, WP_Filesystem_Direct $filesystem = null ) { $this->options = $options; $this->query = $query; $this->context = $context; $this->filesystem = $filesystem ?: rocket_direct_filesystem(); } /* * Optimize the LCP image * * @param string $html HTML content. * * @return string / public function lcp( $html ): string { if ( ! $this->context->is_allowed() ) { return $html; } global $wp; $url = untrailingslashit( home_url( add_query_arg( [], $wp->request ) ) ); $is_mobile = $this->is_mobile(); $row = $this->query->get_row( $url, $is_mobile ); if ( empty( $row ) ) { return $this->inject_beacon( $html, $url, $is_mobile ); } if ( ! $row->has_lcp() ) { return $html; } return $this->preload_lcp( $html, $row ); } /* * Preload the LCP image * * @param string $html HTML content. * @param object $row Corresponding DB row. * * @return string / private function preload_lcp( $html, $row ) { if ( rocket_bypass() ) { // Bail out if rocket_bypass() returns true. return $html; } if ( ! preg_match( '#</title\s>#', $html, $matches ) ) { return $html; } $title = $matches[0]; $preload = $title; $lcp = json_decode( $row->lcp ); $preload .= $this->preload_tag( $lcp ); $replace = preg_replace( '#' . $title . '#', $preload, $html, 1 ); if ( null === $replace ) { return $html; } $replace = $this->set_fetchpriority( $lcp, $replace ); return $replace; } /** * Builds the preload tag * * @param object $lcp LCP object. * * @return string / private function preload_tag( $lcp ): string { $tags = $this->generate_lcp_link_tag_with_sources( $lcp ); return $tags['tags']; } /* * Alters the preload element tag (img\|img-srcset) * * @param object $lcp LCP object. * @param string $html HTML content. * @return string / private function set_fetchpriority( $lcp, string $html ): string { $allowed_types = [ 'img', 'img-srcset', 'picture', ]; if ( empty( $lcp ) \|\| empty( $lcp->type ) \|\| ! in_array( $lcp->type, $allowed_types, true ) ) { return $html; } $html = $this->replace_html_comments( $html ); $url = urldecode( preg_quote( $lcp->src, '/' ) ); $pattern = '#<img(?:[^>]?\s+)?src=["\']' . $url . '["\'](?:\s+[^>]?)?>#'; if ( wp_http_validate_url( $lcp->src ) && ! $this->is_external_file( $lcp->src ) ) { $url = preg_quote( wp_parse_url( $lcp->src, PHP_URL_PATH ), '/' ); $pattern = '#<img(?:[^>]?\s+)?src\s=\s["\'](?:https?:)?(?:\/\/(?:[^\/]+)\/?)?\/?' . $url . '["\'](?:\s+[^>]?)?>#i'; } $html = preg_replace_callback( $pattern, function ( $matches ) { // Check if the fetchpriority attribute already exists. if ( preg_match( '/<img[^>]\sfetchpriority(?:\s=\s["\'][^"\']["\'])?[^>]>/i', $matches[0] ) ) { // If it exists, don't modify the tag. return $matches[0]; } // If it doesn't exist, add the fetchpriority attribute. $replace = preg_replace( '/<img/', '<img fetchpriority="high"', $matches[0] ); if ( null === $replace ) { return $matches[0]; } return $replace; }, $html, 1 ); return $this->restore_html_comments( $html ); } /** * Add above the fold images to lazyload exclusions * * @param array $exclusions Array of excluded patterns. * * @return array / public function add_exclusions( $exclusions ): array { if ( ! $this->context->is_allowed() ) { return $exclusions; } list($atf, $lcp) = [ [], [] ]; global $wp; $url = untrailingslashit( home_url( add_query_arg( [], $wp->request ) ) ); $row = $this->query->get_row( $url, $this->is_mobile() ); if ( ! $row ) { return $exclusions; } if ( $row->lcp && 'not found' !== $row->lcp ) { $lcp = $this->generate_lcp_link_tag_with_sources( json_decode( $row->lcp ) ); $lcp = $lcp['sources']; $lcp = $this->get_path_for_exclusion( $lcp ); } if ( $row->viewport && 'not found' !== $row->viewport ) { $atf = $this->get_atf_sources( json_decode( $row->viewport ) ); $atf = $this->get_path_for_exclusion( $atf ); } $exclusions = array_merge( $exclusions, $lcp, $atf ); // Remove lcp candidate from the atf array. $exclusions = array_unique( $exclusions ); return $exclusions; } /* * Get only the url path to exclude. * * @param array $exclusions Array of exclusions. * @return array / private function get_path_for_exclusion( array $exclusions ): array { $exclusions = array_map( function ( $exclusion ) { $exclusion = wp_parse_url( $exclusion ); return ltrim( $exclusion['path'], '/' ); }, $exclusions ); return $exclusions; } /* * Generate preload link tags with sources for LCP. * * @param object $lcp LCP Object. * @return array / private function generate_lcp_link_tag_with_sources( $lcp ): array { $pairs = [ 'tags' => '', 'sources' => [], ]; if ( ! $lcp && ! is_object( $lcp ) ) { return $pairs; } $tag = ''; $start_tag = '<link rel="preload" data-rocket-preload as="image" '; $end_tag = ' fetchpriority="high">'; $sources = []; switch ( $lcp->type ) { case 'img': $sources[] = $lcp->src; $tag .= $start_tag . 'href="' . ( $this->is_relative( $lcp->src ) ? esc_attr( $lcp->src ) : esc_url( $lcp->src ) ) . '"' . $end_tag; break; case 'img-srcset': $sources[] = $lcp->src; $tag .= $start_tag . 'href="' . ( $this->is_relative( $lcp->src ) ? esc_attr( $lcp->src ) : esc_url( $lcp->src ) ) . '" imagesrcset="' . esc_attr( $lcp->srcset ) . '" imagesizes="' . esc_attr( $lcp->sizes ) . '"' . $end_tag; break; case 'bg-img-set': foreach ( $lcp->bg_set as $set ) { $sources[] = $set->src; } $tag .= $start_tag . 'imagesrcset="' . esc_attr( implode( ',', $sources ) ) . '"' . $end_tag; break; case 'bg-img': foreach ( $lcp->bg_set as $set ) { $sources[] = $set->src; $tag .= $start_tag . 'href="' . ( $this->is_relative( $set->src ) ? esc_attr( $set->src ) : esc_url( $set->src ) ) . '"' . $end_tag; } break; case 'picture': $result = $this->generate_source_tags( $lcp, $start_tag, $end_tag ); $sources = $result['sources']; $tag .= $result['tag']; break; } $pairs['tags'] = $tag; $pairs['sources'] = $sources; return $pairs; } /* * Get above the fold images sources. * * @param array $atfs Above the fold object. * @return array / private function get_atf_sources( array $atfs ): array { if ( ! $atfs && ! is_array( $atfs ) ) { return []; } $sources = []; foreach ( $atfs as $atf ) { switch ( $atf->type ) { case 'img': case 'img-srcset': $sources[] = $atf->src; break; case 'bg-img-set': case 'bg-img': foreach ( $atf->bg_set as $set ) { $sources[] = $set->src; } break; case 'picture': if ( ! empty( $atf->sources ) ) { foreach ( $atf->sources as $source ) { $sources[] = $source->srcset; } } $sources[] = $atf->src; break; } } return $sources; } /* * Determines if the page is mobile and separate cache for mobile files is enabled. * * @return bool / private function is_mobile(): bool { return $this->options->get( 'cache_mobile', 0 ) && $this->options->get( 'do_caching_mobile_files', 0 ) && wp_is_mobile(); } /* * The `inject_beacon` function is used to inject a JavaScript beacon into the HTML content. * * @param string $html The HTML content where the beacon will be injected. * @param string $url The current URL. * @param bool $is_mobile True for mobile device, false otherwise. * * @return string The modified HTML content with the beacon script injected just before the closing body tag. / public function inject_beacon( $html, $url, $is_mobile ): string { $min = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min'; if ( ! $this->filesystem->exists( rocket_get_constant( 'WP_ROCKET_ASSETS_JS_PATH' ) . 'lcp-beacon' . $min . '.js' ) ) { return $html; } $default_width_threshold = $is_mobile ? 393 : 1600; $default_height_threshold = $is_mobile ? 830 : 700; /* * Filters the width threshold for the LCP beacon. * * @param int $width_threshold The width threshold. Default is 393 for mobile and 1920 for others. * @param bool $is_mobile True if the current device is mobile, false otherwise. * @param string $url The current URL. * * @return int The filtered width threshold. / $width_threshold = apply_filters( 'rocket_lcp_width_threshold', $default_width_threshold, $is_mobile, $url ); /* * Filters the height threshold for the LCP beacon. * * @param int $height_threshold The height threshold. Default is 830 for mobile and 1080 for others. * @param bool $is_mobile True if the current device is mobile, false otherwise. * @param string $url The current URL. * * @return int The filtered height threshold. / $height_threshold = apply_filters( 'rocket_lcp_height_threshold', $default_height_threshold, $is_mobile, $url ); if ( ! is_int( $width_threshold ) ) { $width_threshold = $default_width_threshold; } if ( ! is_int( $height_threshold ) ) { $height_threshold = $default_height_threshold; } $default_delay = 500; /* * Filters the delay before the LCP beacon is triggered. * * @param int $delay The delay in milliseconds. Default is 500. / $delay = apply_filters( 'rocket_lcp_delay', $default_delay ); if ( ! is_int( $delay ) ) { $delay = $default_delay; } $data = [ 'ajax_url' => admin_url( 'admin-ajax.php' ), 'nonce' => wp_create_nonce( 'rocket_lcp' ), 'url' => $url, 'is_mobile' => $is_mobile, 'elements' => $this->lcp_atf_elements(), 'width_threshold' => $width_threshold, 'height_threshold' => $height_threshold, 'delay' => $delay, 'debug' => rocket_get_constant( 'WP_ROCKET_DEBUG' ), ]; $inline_script = '<script>var rocket_lcp_data = ' . wp_json_encode( $data ) . '</script>'; // Get the URL of the script. $script_url = rocket_get_constant( 'WP_ROCKET_ASSETS_JS_URL' ) . 'lcp-beacon' . $min . '.js'; // Create the script tag. $script_tag = "<script data-name=\"wpr-lcp-beacon\" src='{$script_url}' async></script>"; // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript // Append the script tag just before the closing body tag. return str_replace( '</body>', $inline_script . $script_tag . '</body>', $html ); } /* * Generates the source tags for the given LCP object. * * This method is used to generate the source tags for the given LCP object. It iterates over the sources of the LCP object, * and for each source, it generates a media query and adds the source to the sources array. It also constructs a tag string * with the source and media query. If a previous max-width is found, it is used to update the media query. The method also * handles the case where a max-width is found in the source's media attribute. * * @param object $lcp The LCP object containing the sources. * @param string $start_tag The starting tag for each source. * @param string $end_tag The ending tag for each source. * * @return array An associative array containing the sources array and the tag string. / private function generate_source_tags( $lcp, $start_tag, $end_tag ) { $prev_max_width = null; $sources = []; $tag = ''; $prev_type = null; // Iterate over the sources in the LCP object. foreach ( $lcp->sources as $i => $source ) { // If the type of the previous source is not equal to the type of the current source, break the loop. if ( ! empty( $source->type ) && $prev_type !== $source->type && null !== $prev_type ) { break; } $media = ! empty( $source->media ) ? $source->media : ''; // If a previous max-width is found, update the media query. if ( null !== $prev_max_width && false === strpos( $media, 'min-width' ) ) { $media = '(min-width: ' . ( $prev_max_width + 0.1 ) . 'px) and ' . $media; } // Add the media attribute to the media string. $media = ! empty( $media ) ? ' media="' . $media . '"' : ''; $sources[] = $source->srcset; // Get the sizes attribute of the source, if it exists. $sizes = ! empty( $source->sizes ) ? ' imagesizes="' . $source->sizes . '"' : ''; // Determine whether to use 'href' or 'imagesrcset' based on the srcset attribute. $link_attribute = ( substr_count( $source->srcset, ',' ) > 0 ) ? 'imagesrcset' : 'href'; // Append the source and media query to the tag string. $tag .= $start_tag . $link_attribute . '="' . $source->srcset . '"' . ( $media ?? '' ) . $sizes . $end_tag; // If a max-width is found in the source's media attribute, update the previous max-width. if ( preg_match( '/$max-width: (\d+(\.\d+)?)px$/', $source->media, $matches ) ) { $prev_max_width = floatval( $matches[1] ); } $prev_type = $source->type; } // If a previous max-width is found, update the media query and add the LCP source to the sources array and the tag string. if ( null !== $prev_max_width ) { $media = ' media="(min-width: ' . ( $prev_max_width + 0.1 ) . 'px)"'; $sources[] = $lcp->src; $tag .= $start_tag . 'href="' . $lcp->src . '"' . $media . $end_tag; } // Return an associative array containing the sources array and the tag string. return [ 'sources' => $sources, 'tag' => $tag, ]; } /* * Returns a comma-separated list of elements to be considered for the lcp/above-the-fold optimization. * * @return string / private function lcp_atf_elements(): string { $elements = [ 'img', 'video', 'picture', 'p', 'main', 'div', 'li', 'svg', 'section', 'header', ]; $default_elements = $elements; /* * Filters the array of elements * * @since 3.16 * * @param array $formats Array of elements */ $elements = apply_filters( 'rocket_atf_elements', $elements ); if ( ! is_array( $elements ) ) { $elements = $default_elements; } $elements = array_filter( $elements, 'is_string' ); return implode( ', ', $elements ); } }

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