<?php

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/**

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* The Placeholder class.

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*

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* Handles responsive placeholders (LQIP), admin column rendering,

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* queueing, and generation logic (local and cloud).

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*

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* @since 3.0

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* @package LiteSpeed

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*/

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namespace LiteSpeed;

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defined( 'WPINC' ) || exit();

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/**

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* Class Placeholder

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*/

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class Placeholder extends Base {

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/**

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* Action type: generate.

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*

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* @var string

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*/

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const TYPE_GENERATE = 'generate';

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/**

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* Action type: clear queue.

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*

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* @var string

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*/

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const TYPE_CLEAR_Q = 'clear_q';

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/**

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* Whether responsive placeholders are enabled.

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*

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* @var bool

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*/

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private $_conf_placeholder_resp;

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/**

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* SVG template for responsive placeholders.

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*

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* @var string

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*/

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private $_conf_placeholder_resp_svg;

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/**

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* Whether LQIP generation via cloud is enabled.

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*

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* @var bool

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*/

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private $_conf_lqip;

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/**

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* LQIP JPEG quality.

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*

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* @var int

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*/

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private $_conf_lqip_qual;

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/**

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* Minimum width for LQIP generation.

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*

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* @var int

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*/

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private $_conf_lqip_min_w;

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/**

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* Minimum height for LQIP generation.

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*

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* @var int

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*/

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private $_conf_lqip_min_h;

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/**

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* Background color for SVG placeholders.

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*

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* @var string

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*/

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private $_conf_placeholder_resp_color;

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/**

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* Whether LQIP generation is async (queued).

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*

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* @var bool

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*/

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private $_conf_placeholder_resp_async;

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/**

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* Default placeholder data (fallback).

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*

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* @var string

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*/

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private $_conf_ph_default;

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/**

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* In-memory map of generated placeholders for current request.

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*

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* @var array<string,string>

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*/

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private $_placeholder_resp_dict = [];

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/**

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* Keys currently queued within this request.

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*

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* @var array<int,string>

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*/

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private $_ph_queue = [];

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/**

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* Stats & request summary for throttling.

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*

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* @var array<string,mixed>

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*/

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protected $_summary;

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/**

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* Init

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*

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* @since 3.0

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*/

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public function __construct() {

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$this->_conf_placeholder_resp = defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( self::O_MEDIA_PLACEHOLDER_RESP );

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$this->_conf_placeholder_resp_svg = $this->conf( self::O_MEDIA_PLACEHOLDER_RESP_SVG );

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$this->_conf_lqip = ! defined( 'LITESPEED_GUEST_OPTM' ) && $this->conf( self::O_MEDIA_LQIP );

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$this->_conf_lqip_qual = $this->conf( self::O_MEDIA_LQIP_QUAL );

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$this->_conf_lqip_min_w = $this->conf( self::O_MEDIA_LQIP_MIN_W );

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$this->_conf_lqip_min_h = $this->conf( self::O_MEDIA_LQIP_MIN_H );

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$this->_conf_placeholder_resp_async = $this->conf( self::O_MEDIA_PLACEHOLDER_RESP_ASYNC );

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$this->_conf_placeholder_resp_color = $this->conf( self::O_MEDIA_PLACEHOLDER_RESP_COLOR );

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$this->_conf_ph_default = $this->conf(self::O_MEDIA_LAZY_PLACEHOLDER) ? $this->conf(self::O_MEDIA_LAZY_PLACEHOLDER) : LITESPEED_PLACEHOLDER;

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$this->_summary = self::get_summary();

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}

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/**

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* Init Placeholder.

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*/

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public function init() {

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Debug2::debug2( '[LQIP] init' );

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add_action( 'litespeed_after_admin_init', [ $this, 'after_admin_init' ] );

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}

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/**

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* Display column in Media.

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*

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* @since 3.0

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* @access public

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*/

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public function after_admin_init() {

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if ( $this->_conf_lqip ) {

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add_filter( 'manage_media_columns', [ $this, 'media_row_title' ] );

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add_filter( 'manage_media_custom_column', [ $this, 'media_row_actions' ], 10, 2 );

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add_action( 'litespeed_media_row_lqip', [ $this, 'media_row_con' ] );

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}

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}

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/**

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* Media Admin Menu -> LQIP column header.

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*

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* @since 3.0

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* @param array<string,string> $posts_columns Columns.

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* @return array<string,string>

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*/

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public function media_row_title( $posts_columns ) {

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$posts_columns['lqip'] = __( 'LQIP', 'litespeed-cache' );

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return $posts_columns;

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}

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/**

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* Media Admin Menu -> LQIP Column renderer trigger.

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*

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* @since 3.0

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* @param string $column_name Column name.

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* @param int $post_id Attachment ID.

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* @return void

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*/

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public function media_row_actions( $column_name, $post_id ) {

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if ( 'lqip' !== $column_name ) {

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return;

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}

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do_action( 'litespeed_media_row_lqip', $post_id );

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}

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/**

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* Display LQIP column.

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*

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* @since 3.0

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* @param int $post_id Attachment ID.

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* @return void

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*/

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public function media_row_con( $post_id ) {

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$meta_value = wp_get_attachment_metadata( $post_id );

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if ( empty( $meta_value['file'] ) ) {

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return;

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}

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$total_files = 0;

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// List all sizes.

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$all_sizes = [ $meta_value['file'] ];

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$size_path = pathinfo( $meta_value['file'], PATHINFO_DIRNAME ) . '/';

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if ( ! empty( $meta_value['sizes'] ) && is_array( $meta_value['sizes'] ) ) {

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foreach ( $meta_value['sizes'] as $v ) {

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if ( ! empty( $v['file'] ) ) {

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$all_sizes[] = $size_path . $v['file'];

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}

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}

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}

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foreach ( $all_sizes as $short_path ) {

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$lqip_folder = LITESPEED_STATIC_DIR . '/lqip/' . $short_path;

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if ( is_dir( $lqip_folder ) ) {

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Debug2::debug( '[LQIP] Found folder: ' . $short_path );

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// List all files.

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foreach ( scandir( $lqip_folder ) as $v ) {

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if ( '.' === $v || '..' === $v ) {

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continue;

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}

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if ( 0 === $total_files ) {

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echo '<div class="litespeed-media-lqip"><img src="' .

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esc_url( Str::trim_quotes( File::read( $lqip_folder . '/' . $v ) ) ) .

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'" alt="' .

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esc_attr( sprintf( __( 'LQIP image preview for size %s', 'litespeed-cache' ), $v ) ) .

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'"></div>';

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}

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echo '<div class="litespeed-media-size"><a href="' . esc_url( Str::trim_quotes( File::read( $lqip_folder . '/' . $v ) ) ) . '" target="_blank">' . esc_html( $v ) . '</a></div>';

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++$total_files;

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}

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}

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}

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if ( 0 === $total_files ) {

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echo '—';

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}

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}

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/**

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* Replace image HTML with placeholder-based lazy version.

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*

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* @since 3.0

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* @param string $html Original <img> HTML.

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* @param string $src Image source URL.

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* @param string $size Requested size (e.g. "300x200").

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* @return string Modified HTML.

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*/

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public function replace( $html, $src, $size ) {

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// Check if need to enable responsive placeholder or not.

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$ph_candidate = $this->_placeholder( $src, $size );

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$this_placeholder = $ph_candidate ? $ph_candidate : $this->_conf_ph_default;

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$additional_attr = '';

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if ( $this->_conf_lqip && $this_placeholder !== $this->_conf_ph_default ) {

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Debug2::debug2( '[LQIP] Use resp LQIP [size] ' . $size );

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$additional_attr = ' data-placeholder-resp="' . esc_attr( Str::trim_quotes( $size ) ) . '"';

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}

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$snippet = ( defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( self::O_OPTM_NOSCRIPT_RM ) ) ? '' : '<noscript>' . $html . '</noscript>';

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$html = preg_replace(

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[

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'/\s+src=/i',

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'/\s+srcset=/i',

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'/\s+sizes=/i',

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],

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[

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' data-src=',

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' data-srcset=',

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' data-sizes=',

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],

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$html

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);

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$html = preg_replace(

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'/<img\s+/i',

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'<img data-lazyloaded="1"' . $additional_attr . ' src="' . Str::trim_quotes($this_placeholder) . '" ',

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$html

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);

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// $html = str_replace( array( ' src=', ' srcset=', ' sizes=' ), array( ' data-src=', ' data-srcset=', ' data-sizes=' ), $html );

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// $html = str_replace( '<img ', '<img data-lazyloaded="1"' . $additional_attr . ' src="' . esc_url( Str::trim_quotes( $this_placeholder ) ) . '" ', $html );

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$snippet = $html . $snippet;

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return $snippet;

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}

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/**

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* Generate responsive placeholder (or schedule generation).

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*

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* @since 2.5.1

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* @access private

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* @param string $src Image source URL.

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* @param string $size Size string "WIDTHxHEIGHT".

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* @return string|false Data URL placeholder or false.

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*/

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private function _placeholder( $src, $size ) {

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// Low Quality Image Placeholders.

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if ( ! $size ) {

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Debug2::debug2( '[LQIP] no size ' . $src );

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return false;

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}

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if ( ! $this->_conf_placeholder_resp ) {

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return false;

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}

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// If use local generator.

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if ( ! $this->_conf_lqip || ! $this->_lqip_size_check( $size ) ) {

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return $this->_generate_placeholder_locally( $size );

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}

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Debug2::debug2( '[LQIP] Resp LQIP process [src] ' . $src . ' [size] ' . $size );

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$arr_key = $size . ' ' . $src;

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// Check if its already in dict or not.

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if ( ! empty( $this->_placeholder_resp_dict[ $arr_key ] ) ) {

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Debug2::debug2( '[LQIP] already in dict' );

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return $this->_placeholder_resp_dict[ $arr_key ];

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}

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// Need to generate the responsive placeholder.

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$placeholder_realpath = $this->_placeholder_realpath( $src, $size ); // todo: give offload API.

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if ( file_exists( $placeholder_realpath ) ) {

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Debug2::debug2( '[LQIP] file exists' );

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$this->_placeholder_resp_dict[ $arr_key ] = File::read( $placeholder_realpath );

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return $this->_placeholder_resp_dict[ $arr_key ];

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}

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// Prevent repeated requests in same request.

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if ( in_array( $arr_key, $this->_ph_queue, true ) ) {

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Debug2::debug2( '[LQIP] file bypass generating due to in queue' );

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return $this->_generate_placeholder_locally( $size );

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}

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$hit = Utility::str_hit_array( $src, $this->conf( self::O_MEDIA_LQIP_EXC ) );

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if ( $hit ) {

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Debug2::debug2( '[LQIP] file bypass generating due to exclude setting [hit] ' . $hit );

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return $this->_generate_placeholder_locally( $size );

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}

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$this->_ph_queue[] = $arr_key;

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// Send request to generate placeholder.

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if ( ! $this->_conf_placeholder_resp_async ) {

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// If requested recently, bypass.

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if ( $this->_summary && ! empty( $this->_summary['curr_request'] ) && ( time() - (int) $this->_summary['curr_request'] ) < 300 ) {

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Debug2::debug2( '[LQIP] file bypass generating due to interval limit' );

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return false;

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}

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// Generate immediately.

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$this->_placeholder_resp_dict[ $arr_key ] = $this->_generate_placeholder( $arr_key );

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return $this->_placeholder_resp_dict[ $arr_key ];

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}

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// Prepare default svg placeholder as tmp placeholder.

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$tmp_placeholder = $this->_generate_placeholder_locally( $size );

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// Store it to prepare for cron.

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$queue = $this->load_queue( 'lqip' );

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if ( in_array( $arr_key, $queue, true ) ) {

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Debug2::debug2( '[LQIP] already in queue' );

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return $tmp_placeholder;

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}

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if ( count( $queue ) > 500 ) {

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Debug2::debug2( '[LQIP] queue is full' );

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return $tmp_placeholder;

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}

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$queue[] = $arr_key;

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$this->save_queue( 'lqip', $queue );

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Debug2::debug( '[LQIP] Added placeholder queue' );

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return $tmp_placeholder;

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}

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/**

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* Generate realpath of placeholder file.

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*

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* @since 2.5.1

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* @access private

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* @param string $src Image source URL.

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* @param string $size Size string "WIDTHxHEIGHT".

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* @return string Absolute file path.

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*/

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private function _placeholder_realpath( $src, $size ) {

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// Use LQIP Cloud generator, each image placeholder will be separately stored.

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// Compatibility with WebP and AVIF.

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$src = Utility::drop_webp( $src );

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$filepath_prefix = $this->_build_filepath_prefix( 'lqip' );

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// External images will use cache folder directly.

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$domain = wp_parse_url( $src, PHP_URL_HOST );

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if ( $domain && ! Utility::internal( $domain ) ) {

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// todo: need to improve `util:internal()` to include `CDN::internal()`

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$md5 = md5($src);

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return LITESPEED_STATIC_DIR . $filepath_prefix . 'remote/' . substr( $md5, 0, 1 ) . '/' . substr( $md5, 1, 1 ) . '/' . $md5 . '.' . $size;

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}

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// Drop domain.

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$short_path = Utility::att_short_path( $src );

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return LITESPEED_STATIC_DIR . $filepath_prefix . $short_path . '/' . $size;

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}

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/**

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* Cron placeholder generation.

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*

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* @since 2.5.1

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* @param bool $do_continue If true, process full queue in one run.

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* @return void

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*/

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public static function cron( $do_continue = false ) {

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$_instance = self::cls();

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$queue = $_instance->load_queue( 'lqip' );

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if ( empty( $queue ) ) {

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return;

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}

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// For cron, need to check request interval too.

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if ( ! $do_continue ) {

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if ( ! empty( $_instance->_summary['curr_request'] ) && ( time() - (int) $_instance->_summary['curr_request'] ) < 300 ) {

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Debug2::debug( '[LQIP] Last request not done' );

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return;

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}

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}

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foreach ( $queue as $v ) {

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Debug2::debug( '[LQIP] cron job [size] ' . $v );

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$res = $_instance->_generate_placeholder( $v, true );

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// Exit queue if out of quota.

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if ( 'out_of_quota' === $res ) {

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return;

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}

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// Only request first one unless continuing.

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if ( ! $do_continue ) {

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return;

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}

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}

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}

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/**

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* Generate placeholder locally (SVG).

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*

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* @since 3.0

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* @access private

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* @param string $size Size string "WIDTHxHEIGHT".

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* @return string Data URL for SVG placeholder.

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*/

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private function _generate_placeholder_locally( $size ) {

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Debug2::debug2( '[LQIP] _generate_placeholder local [size] ' . $size );

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$size = explode( 'x', $size );

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$svg = str_replace(

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[ '{width}', '{height}', '{color}' ],

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[ (int) $size[0], (int) $size[1], $this->_conf_placeholder_resp_color ],

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$this->_conf_placeholder_resp_svg

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);

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// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode

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return 'data:image/svg+xml;base64,' . base64_encode( $svg );

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}

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/**

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* Send to LiteSpeed API to generate placeholder (and persist).

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*

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* @since 2.5.1

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* @access private

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* @param string $raw_size_and_src Concatenated "SIZE SRC".

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* @param bool $from_cron If true, called from cron context.

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* @return string Data URL placeholder.

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*/

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private function _generate_placeholder( $raw_size_and_src, $from_cron = false ) {

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// Parse containing size and src info.

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$size_and_src = explode( ' ', $raw_size_and_src, 2 );

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