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Editing: placeholder.cls.php
<?php /** * The Placeholder class. * * Handles responsive placeholders (LQIP), admin column rendering, * queueing, and generation logic (local and cloud). * * @since 3.0 * @package LiteSpeed */ namespace LiteSpeed; defined( 'WPINC' ) || exit(); /** * Class Placeholder */ class Placeholder extends Base { /** * Action type: generate. * * @var string */ const TYPE_GENERATE = 'generate'; /** * Action type: clear queue. * * @var string */ const TYPE_CLEAR_Q = 'clear_q'; /** * Whether responsive placeholders are enabled. * * @var bool */ private $_conf_placeholder_resp; /** * SVG template for responsive placeholders. * * @var string */ private $_conf_placeholder_resp_svg; /** * Whether LQIP generation via cloud is enabled. * * @var bool */ private $_conf_lqip; /** * LQIP JPEG quality. * * @var int */ private $_conf_lqip_qual; /** * Minimum width for LQIP generation. * * @var int */ private $_conf_lqip_min_w; /** * Minimum height for LQIP generation. * * @var int */ private $_conf_lqip_min_h; /** * Background color for SVG placeholders. * * @var string */ private $_conf_placeholder_resp_color; /** * Whether LQIP generation is async (queued). * * @var bool */ private $_conf_placeholder_resp_async; /** * Default placeholder data (fallback). * * @var string */ private $_conf_ph_default; /** * In-memory map of generated placeholders for current request. * * @var array<string,string> */ private $_placeholder_resp_dict = []; /** * Keys currently queued within this request. * * @var array<int,string> */ private $_ph_queue = []; /** * Stats & request summary for throttling. * * @var array<string,mixed> */ protected $_summary; /** * Init * * @since 3.0 */ public function __construct() { $this->_conf_placeholder_resp = defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( self::O_MEDIA_PLACEHOLDER_RESP ); $this->_conf_placeholder_resp_svg = $this->conf( self::O_MEDIA_PLACEHOLDER_RESP_SVG ); $this->_conf_lqip = ! defined( 'LITESPEED_GUEST_OPTM' ) && $this->conf( self::O_MEDIA_LQIP ); $this->_conf_lqip_qual = $this->conf( self::O_MEDIA_LQIP_QUAL ); $this->_conf_lqip_min_w = $this->conf( self::O_MEDIA_LQIP_MIN_W ); $this->_conf_lqip_min_h = $this->conf( self::O_MEDIA_LQIP_MIN_H ); $this->_conf_placeholder_resp_async = $this->conf( self::O_MEDIA_PLACEHOLDER_RESP_ASYNC ); $this->_conf_placeholder_resp_color = $this->conf( self::O_MEDIA_PLACEHOLDER_RESP_COLOR ); $this->_conf_ph_default = $this->conf(self::O_MEDIA_LAZY_PLACEHOLDER) ? $this->conf(self::O_MEDIA_LAZY_PLACEHOLDER) : LITESPEED_PLACEHOLDER; $this->_summary = self::get_summary(); } /** * Init Placeholder. */ public function init() { Debug2::debug2( '[LQIP] init' ); add_action( 'litespeed_after_admin_init', [ $this, 'after_admin_init' ] ); } /** * Display column in Media. * * @since 3.0 * @access public */ public function after_admin_init() { if ( $this->_conf_lqip ) { add_filter( 'manage_media_columns', [ $this, 'media_row_title' ] ); add_filter( 'manage_media_custom_column', [ $this, 'media_row_actions' ], 10, 2 ); add_action( 'litespeed_media_row_lqip', [ $this, 'media_row_con' ] ); } } /** * Media Admin Menu -> LQIP column header. * * @since 3.0 * @param array<string,string> $posts_columns Columns. * @return array<string,string> */ public function media_row_title( $posts_columns ) { $posts_columns['lqip'] = __( 'LQIP', 'litespeed-cache' ); return $posts_columns; } /** * Media Admin Menu -> LQIP Column renderer trigger. * * @since 3.0 * @param string $column_name Column name. * @param int $post_id Attachment ID. * @return void */ public function media_row_actions( $column_name, $post_id ) { if ( 'lqip' !== $column_name ) { return; } do_action( 'litespeed_media_row_lqip', $post_id ); } /** * Display LQIP column. * * @since 3.0 * @param int $post_id Attachment ID. * @return void */ public function media_row_con( $post_id ) { $meta_value = wp_get_attachment_metadata( $post_id ); if ( empty( $meta_value['file'] ) ) { return; } $total_files = 0; // List all sizes. $all_sizes = [ $meta_value['file'] ]; $size_path = pathinfo( $meta_value['file'], PATHINFO_DIRNAME ) . '/'; if ( ! empty( $meta_value['sizes'] ) && is_array( $meta_value['sizes'] ) ) { foreach ( $meta_value['sizes'] as $v ) { if ( ! empty( $v['file'] ) ) { $all_sizes[] = $size_path . $v['file']; } } } foreach ( $all_sizes as $short_path ) { $lqip_folder = LITESPEED_STATIC_DIR . '/lqip/' . $short_path; if ( is_dir( $lqip_folder ) ) { Debug2::debug( '[LQIP] Found folder: ' . $short_path ); // List all files. foreach ( scandir( $lqip_folder ) as $v ) { if ( '.' === $v || '..' === $v ) { continue; } if ( 0 === $total_files ) { $file = Str::trim_quotes( File::read( $lqip_folder . '/' . $v ) ); echo '<div class="litespeed-media-lqip"><img src="' . esc_attr( $file ) . '" alt="' . esc_attr( sprintf( __( 'LQIP image preview for size %s', 'litespeed-cache' ), $v ) ) . '"></div>'; } echo '<div class="litespeed-media-size"><a href="' . esc_attr( $file ) . '" target="_blank">' . esc_html( $v ) . '</a></div>'; ++$total_files; } } } if ( 0 === $total_files ) { echo '—'; } } /** * Replace image HTML with placeholder-based lazy version. * * @since 3.0 * @param string $html Original <img> HTML. * @param string $src Image source URL. * @param string $size Requested size (e.g. "300x200"). * @return string Modified HTML. */ public function replace( $html, $src, $size ) { // Check if need to enable responsive placeholder or not. $ph_candidate = $this->_placeholder( $src, $size ); $this_placeholder = $ph_candidate ? $ph_candidate : $this->_conf_ph_default; $additional_attr = ''; if ( $this->_conf_lqip && $this_placeholder !== $this->_conf_ph_default ) { Debug2::debug2( '[LQIP] Use resp LQIP [size] ' . $size ); $additional_attr = ' data-placeholder-resp="' . esc_attr( Str::trim_quotes( $size ) ) . '"'; } $snippet = ( defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( self::O_OPTM_NOSCRIPT_RM ) ) ? '' : '<noscript>' . $html . '</noscript>'; $html = preg_replace( [ '/\s+src=/i', '/\s+srcset=/i', '/\s+sizes=/i', ], [ ' data-src=', ' data-srcset=', ' data-sizes=', ], $html ); $html = preg_replace( '/<img\s+/i', '<img data-lazyloaded="1"' . $additional_attr . ' src="' . Str::trim_quotes($this_placeholder) . '" ', $html ); // $html = str_replace( array( ' src=', ' srcset=', ' sizes=' ), array( ' data-src=', ' data-srcset=', ' data-sizes=' ), $html ); // $html = str_replace( '<img ', '<img data-lazyloaded="1"' . $additional_attr . ' src="' . esc_url( Str::trim_quotes( $this_placeholder ) ) . '" ', $html ); $snippet = $html . $snippet; return $snippet; } /** * Generate responsive placeholder (or schedule generation). * * @since 2.5.1 * @access private * @param string $src Image source URL. * @param string $size Size string "WIDTHxHEIGHT". * @return string|false Data URL placeholder or false. */ private function _placeholder( $src, $size ) { // Low Quality Image Placeholders. if ( ! $size ) { Debug2::debug2( '[LQIP] no size ' . $src ); return false; } if ( ! $this->_conf_placeholder_resp ) { return false; } // If use local generator. if ( ! $this->_conf_lqip || ! $this->_lqip_size_check( $size ) ) { return $this->_generate_placeholder_locally( $size ); } Debug2::debug2( '[LQIP] Resp LQIP process [src] ' . $src . ' [size] ' . $size ); $arr_key = $size . ' ' . $src; // Check if its already in dict or not. if ( ! empty( $this->_placeholder_resp_dict[ $arr_key ] ) ) { Debug2::debug2( '[LQIP] already in dict' ); return $this->_placeholder_resp_dict[ $arr_key ]; } // Need to generate the responsive placeholder. $placeholder_realpath = $this->_placeholder_realpath( $src, $size ); // todo: give offload API. if ( file_exists( $placeholder_realpath ) ) { Debug2::debug2( '[LQIP] file exists' ); $this->_placeholder_resp_dict[ $arr_key ] = File::read( $placeholder_realpath ); return $this->_placeholder_resp_dict[ $arr_key ]; } // Prevent repeated requests in same request. if ( in_array( $arr_key, $this->_ph_queue, true ) ) { Debug2::debug2( '[LQIP] file bypass generating due to in queue' ); return $this->_generate_placeholder_locally( $size ); } $hit = Utility::str_hit_array( $src, $this->conf( self::O_MEDIA_LQIP_EXC ) ); if ( $hit ) { Debug2::debug2( '[LQIP] file bypass generating due to exclude setting [hit] ' . $hit ); return $this->_generate_placeholder_locally( $size ); } $this->_ph_queue[] = $arr_key; // Send request to generate placeholder. if ( ! $this->_conf_placeholder_resp_async ) { // If requested recently, bypass. if ( $this->_summary && ! empty( $this->_summary['curr_request'] ) && ( time() - (int) $this->_summary['curr_request'] ) < 300 ) { Debug2::debug2( '[LQIP] file bypass generating due to interval limit' ); return false; } // Generate immediately. $this->_placeholder_resp_dict[ $arr_key ] = $this->_generate_placeholder( $arr_key ); return $this->_placeholder_resp_dict[ $arr_key ]; } // Prepare default svg placeholder as tmp placeholder. $tmp_placeholder = $this->_generate_placeholder_locally( $size ); // Store it to prepare for cron. $queue = $this->load_queue( 'lqip' ); if ( in_array( $arr_key, $queue, true ) ) { Debug2::debug2( '[LQIP] already in queue' ); return $tmp_placeholder; } if ( count( $queue ) > 500 ) { Debug2::debug2( '[LQIP] queue is full' ); return $tmp_placeholder; } $queue[] = $arr_key; $this->save_queue( 'lqip', $queue ); Debug2::debug( '[LQIP] Added placeholder queue' ); return $tmp_placeholder; } /** * Generate realpath of placeholder file. * * @since 2.5.1 * @access private * @param string $src Image source URL. * @param string $size Size string "WIDTHxHEIGHT". * @return string Absolute file path. */ private function _placeholder_realpath( $src, $size ) { // Use LQIP Cloud generator, each image placeholder will be separately stored. // Compatibility with WebP and AVIF. $src = Utility::drop_webp( $src ); $filepath_prefix = $this->_build_filepath_prefix( 'lqip' ); // External images will use cache folder directly. $domain = wp_parse_url( $src, PHP_URL_HOST ); if ( $domain && ! Utility::internal( $domain ) ) { // todo: need to improve `util:internal()` to include `CDN::internal()` $md5 = md5($src); return LITESPEED_STATIC_DIR . $filepath_prefix . 'remote/' . substr( $md5, 0, 1 ) . '/' . substr( $md5, 1, 1 ) . '/' . $md5 . '.' . $size; } // Drop domain. $short_path = Utility::att_short_path( $src ); return LITESPEED_STATIC_DIR . $filepath_prefix . $short_path . '/' . $size; } /** * Cron placeholder generation. * * @since 2.5.1 * @param bool $do_continue If true, process full queue in one run. * @return void */ public static function cron( $do_continue = false ) { $_instance = self::cls(); $queue = $_instance->load_queue( 'lqip' ); if ( empty( $queue ) ) { return; } // For cron, need to check request interval too. if ( ! $do_continue ) { if ( ! empty( $_instance->_summary['curr_request'] ) && ( time() - (int) $_instance->_summary['curr_request'] ) < 300 ) { Debug2::debug( '[LQIP] Last request not done' ); return; } } foreach ( $queue as $v ) { Debug2::debug( '[LQIP] cron job [size] ' . $v ); $res = $_instance->_generate_placeholder( $v, true ); // Exit queue if out of quota. if ( 'out_of_quota' === $res ) { return; } // Only request first one unless continuing. if ( ! $do_continue ) { return; } } } /** * Generate placeholder locally (SVG). * * @since 3.0 * @access private * @param string $size Size string "WIDTHxHEIGHT". * @return string Data URL for SVG placeholder. */ private function _generate_placeholder_locally( $size ) { Debug2::debug2( '[LQIP] _generate_placeholder local [size] ' . $size ); $size = explode( 'x', $size ); $svg = str_replace( [ '{width}', '{height}', '{color}' ], [ (int) $size[0], (int) $size[1], $this->_conf_placeholder_resp_color ], $this->_conf_placeholder_resp_svg ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode return 'data:image/svg+xml;base64,' . base64_encode( $svg ); } /** * Send to LiteSpeed API to generate placeholder (and persist). * * @since 2.5.1 * @access private * @param string $raw_size_and_src Concatenated "SIZE SRC". * @param bool $from_cron If true, called from cron context. * @return string Data URL placeholder. */ private function _generate_placeholder( $raw_size_and_src, $from_cron = false ) { // Parse containing size and src info. $size_and_src = explode( ' ', $raw_size_and_src, 2 ); $size = $size_and_src[0]; if ( empty( $size_and_src[1] ) ) { $this->_popup_and_save( $raw_size_and_src ); Debug2::debug( '[LQIP] ❌ No src [raw] ' . $raw_size_and_src ); return $this->_generate_placeholder_locally( $size ); } $src = $size_and_src[1]; $file = $this->_placeholder_realpath( $src, $size ); // Local generate SVG to serve (repeated here to clear queue if settings changed). if ( ! $this->_conf_lqip || ! $this->_lqip_size_check( $size ) ) { $data = $this->_generate_placeholder_locally( $size ); } else { $err = false; $allowance = Cloud::cls()->allowance( Cloud::SVC_LQIP, $err ); if ( ! $allowance ) { Debug2::debug( '[LQIP] ❌ No credit: ' . $err ); $err && Admin_Display::error( Error::msg( $err ) ); if ( $from_cron ) { return 'out_of_quota'; } return $this->_generate_placeholder_locally( $size ); } // Generate LQIP. list( $width, $height ) = explode( 'x', $size ); $req_data = [ 'width' => (int) $width, 'height' => (int) $height, 'url' => Utility::drop_webp( $src ), 'quality' => (int) $this->_conf_lqip_qual, ]; // Check if the image is 404 first. if ( File::is_404( $req_data['url'] ) ) { $this->_popup_and_save( $raw_size_and_src, true ); $this->_append_exc( $src ); Debug2::debug( '[LQIP] 404 before request [src] ' . $req_data['url'] ); return $this->_generate_placeholder_locally( $size ); } // Update request status. $this->_summary['curr_request'] = time(); self::save_summary(); $json = Cloud::post( Cloud::SVC_LQIP, $req_data, 120 ); if ( ! is_array( $json ) ) { return $this->_generate_placeholder_locally( $size ); } if ( empty( $json['lqip'] ) || 0 !== strpos( $json['lqip'], 'data:image/svg+xml' ) ) { // Image error, pop up the current queue. $this->_popup_and_save( $raw_size_and_src, true ); $this->_append_exc( $src ); Debug2::debug( '[LQIP] wrong response format', $json ); return $this->_generate_placeholder_locally( $size ); } $data = $json['lqip']; Debug2::debug( '[LQIP] _generate_placeholder LQIP' ); } // Write to file. File::save( $file, $data, true ); // Save summary data. $this->_summary['last_spent'] = time() - (int) $this->_summary['curr_request']; $this->_summary['last_request'] = $this->_summary['curr_request']; $this->_summary['curr_request'] = 0; self::save_summary(); $this->_popup_and_save( $raw_size_and_src ); Debug2::debug( '[LQIP] saved LQIP ' . $file ); return $data; } /** * Check if the size is valid to send LQIP request or not. * * @since 3.0 * @param string $size Size string "WIDTHxHEIGHT". * @return bool True if meets minimums. */ private function _lqip_size_check( $size ) { $size = explode( 'x', $size ); if ( ( (int) $size[0] >= (int) $this->_conf_lqip_min_w ) || ( (int) $size[1] >= (int) $this->_conf_lqip_min_h ) ) { return true; } Debug2::debug2( '[LQIP] Size too small' ); return false; } /** * Add to LQIP exclude list. * * @since 3.4 * @param string $src Image URL. * @return void */ private function _append_exc( $src ) { $val = $this->conf( self::O_MEDIA_LQIP_EXC ); $val[] = $src; $this->cls( 'Conf' )->update( self::O_MEDIA_LQIP_EXC, $val ); Debug2::debug( '[LQIP] Appended to LQIP Excludes [URL] ' . $src ); } /** * Pop up the current request from queue and save. * * @since 3.0 * @param string $raw_size_and_src Concatenated "SIZE SRC". * @param bool $append_to_exc If true, also add to exclusion list. * @return void */ private function _popup_and_save( $raw_size_and_src, $append_to_exc = false ) { $queue = $this->load_queue( 'lqip' ); if ( ! empty( $queue ) && in_array( $raw_size_and_src, $queue, true ) ) { $idx = array_search( $raw_size_and_src, $queue, true ); if ( false !== $idx ) { unset( $queue[ $idx ] ); } } if ( $append_to_exc ) { $size_and_src = explode( ' ', $raw_size_and_src, 2 ); if (isset( $size_and_src[1] ) && $size_and_src[1]) { $this_src = $size_and_src[1]; // Append to lqip exc setting first. $this->_append_exc( $this_src ); // Check if other queues contain this src or not. if ( $queue ) { foreach ( $queue as $k => $raw_item ) { $parsed = explode( ' ', $raw_item, 2 ); if ( empty( $parsed[1] ) ) { continue; } if ( $parsed[1] === $this_src ) { unset( $queue[ $k ] ); } } } } } $this->save_queue( 'lqip', $queue ); } /** * Handle all request actions from main cls. * * @since 2.5.1 * @access public * @return void */ public function handler() { $type = Router::verify_type(); switch ( $type ) { case self::TYPE_GENERATE: self::cron( true ); break; case self::TYPE_CLEAR_Q: $this->clear_q( 'lqip' ); break; default: break; } Admin::redirect(); } }
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