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<?php
/**
* The class to operate media data.
*
* @package LiteSpeed
* @since 1.4
*/
namespace LiteSpeed;
defined( 'WPINC' ) || exit();
/**
* Class Media
*
* Handles media-related optimizations like lazy loading, next-gen image replacement, and admin UI.
*/
class Media extends Root {
const LOG_TAG = '📺';
const LIB_FILE_IMG_LAZYLOAD = 'assets/js/lazyload.min.js';
/**
* Current page buffer content.
*
* @var string
*/
private $content;
/**
* WordPress uploads directory info.
*
* @var array
*/
private $_wp_upload_dir;
/**
* List of VPI (viewport images) to preload in <head>.
*
* @var array
*/
private $_vpi_preload_list = [];
/**
* The user-level next-gen format supported (''|webp|avif).
*
* @var string
*/
private $_format = '';
/**
* The system-level chosen next-gen format (webp|avif).
*
* @var string
*/
private $_sys_format = '';
/**
* Init.
*
* @since 1.4
*/
public function __construct() {
self::debug2( 'init' );
$this->_wp_upload_dir = wp_upload_dir();
if ( $this->conf( Base::O_IMG_OPTM_WEBP ) ) {
$this->_sys_format = 'webp';
$this->_format = 'webp';
if ( 2 === $this->conf( Base::O_IMG_OPTM_WEBP ) ) {
$this->_sys_format = 'avif';
$this->_format = 'avif';
}
if ( ! $this->_browser_support_next_gen() ) {
$this->_format = '';
}
$this->_format = apply_filters( 'litespeed_next_gen_format', $this->_format );
}
}
/**
* Hooks after user init.
*
* @since 7.2
* @since 7.4 Add media replace original with scaled.
* @return void
*/
public function after_user_init() {
// Hook to attachment delete action (PR#844, Issue#841) for AJAX del compatibility.
add_action( 'delete_attachment', array( $this, 'delete_attachment' ), 11, 2 );
// For big images, allow to replace original with scaled image.
if ( $this->conf( Base::O_MEDIA_AUTO_RESCALE_ORI ) ) {
// Added priority 9 to happen before other functions added.
add_filter( 'wp_update_attachment_metadata', array( $this, 'rescale_ori' ), 9, 2 );
}
}
/**
* Init optm features.
*
* @since 3.0
* @access public
* @return void
*/
public function init() {
if ( is_admin() ) {
return;
}
// Due to ajax call doesn't send correct accept header, have to limit webp to HTML only.
if ( $this->webp_support() ) {
// Hook to srcset.
if ( function_exists( 'wp_calculate_image_srcset' ) ) {
add_filter( 'wp_calculate_image_srcset', array( $this, 'webp_srcset' ), 988 );
}
// Hook to mime icon
// add_filter( 'wp_get_attachment_image_src', array( $this, 'webp_attach_img_src' ), 988 );// todo: need to check why not
// add_filter( 'wp_get_attachment_url', array( $this, 'webp_url' ), 988 ); // disabled to avoid wp-admin display
}
if ( $this->conf( Base::O_MEDIA_LAZY ) && ! $this->cls( 'Metabox' )->setting( 'litespeed_no_image_lazy' ) ) {
self::debug( 'Suppress default WP lazyload' );
add_filter( 'wp_lazy_loading_enabled', '__return_false' );
}
/**
* Replace gravatar.
*
* @since 3.0
*/
$this->cls( 'Avatar' );
add_filter( 'litespeed_buffer_finalize', array( $this, 'finalize' ), 4 );
add_filter( 'litespeed_optm_html_head', array( $this, 'finalize_head' ) );
}
/**
* Handle attachment create (rescale original).
*
* @param array $metadata Current meta array.
* @param int $attachment_id Attachment ID.
* @return array Modified metadata.
* @since 7.4
*/
public function rescale_ori( $metadata, $attachment_id ) {
// Test if create and image was resized.
if ( $metadata && isset( $metadata['original_image'], $metadata['file'] ) && false !== strpos( $metadata['file'], '-scaled' ) ) {
// Get rescaled file name.
$path_exploded = explode( '/', strrev( $metadata['file'] ), 2 );
$rescaled_file_name = strrev( $path_exploded[0] );
// Create paths for images: resized and original.
$base_path = $this->_wp_upload_dir['basedir'] . $this->_wp_upload_dir['subdir'] . '/';
$rescaled_path = $base_path . $rescaled_file_name;
$new_path = $base_path . $metadata['original_image'];
// Change array file key.
$metadata['file'] = $this->_wp_upload_dir['subdir'] . '/' . $metadata['original_image'];
if ( 0 === strpos( $metadata['file'], '/' ) ) {
$metadata['file'] = substr( $metadata['file'], 1 );
}
// Delete array "original_image" key.
unset( $metadata['original_image'] );
if ( file_exists( $rescaled_path ) && file_exists( $new_path ) ) {
// Move rescaled to original using WP_Filesystem.
global $wp_filesystem;
if ( ! $wp_filesystem ) {
require_once ABSPATH . '/wp-admin/includes/file.php';
\WP_Filesystem();
}
if ( $wp_filesystem ) {
$wp_filesystem->move( $rescaled_path, $new_path, true );
}
// Update meta "_wp_attached_file".
update_post_meta( $attachment_id, '_wp_attached_file', $metadata['file'] );
}
}
return $metadata;
}
/**
* Add featured image and VPI preloads to head.
*
* @param string $content Current head HTML.
* @return string Modified head HTML.
*/
public function finalize_head( $content ) {
// <link rel="preload" as="image" href="xx">
if ( $this->_vpi_preload_list ) {
foreach ( $this->_vpi_preload_list as $v ) {
$content .= '<link rel="preload" as="image" href="' . esc_url( Str::trim_quotes( $v ) ) . '">';
}
}
return $content;
}
/**
* Adjust WP default JPG quality.
*
* @since 3.0
* @access public
*
* @param int $quality Current quality.
* @return int Adjusted quality.
*/
public function adjust_jpg_quality( $quality ) {
$v = $this->conf( Base::O_IMG_OPTM_JPG_QUALITY );
if ( $v ) {
return $v;
}
return $quality;
}
/**
* Register admin menu.
*
* @since 1.6.3
* @access public
* @return void
*/
public function after_admin_init() {
/**
* JPG quality control.
*
* @since 3.0
*/
add_filter( 'jpeg_quality', array( $this, 'adjust_jpg_quality' ) );
add_filter( 'manage_media_columns', array( $this, 'media_row_title' ) );
add_filter( 'manage_media_custom_column', array( $this, 'media_row_actions' ), 10, 2 );
add_action( 'litespeed_media_row', array( $this, 'media_row_con' ) );
}
/**
* Media delete action hook.
*
* @since 2.4.3
* @access public
*
* @param int $post_id Post ID.
* @return void
*/
public static function delete_attachment( $post_id ) {
self::debug( 'delete_attachment [pid] ' . $post_id );
Img_Optm::cls()->reset_row( $post_id );
}
/**
* Return media file info if exists.
*
* This is for remote attachment plugins.
*
* @since 2.9.8
* @access public
*
* @param string $short_file_path Relative file path under uploads.
* @param int $post_id Post ID.
* @return array|false Array( url, md5, size ) or false.
*/
public function info( $short_file_path, $post_id ) {
$short_file_path = wp_normalize_path( $short_file_path );
$basedir = $this->_wp_upload_dir['basedir'] . '/';
if ( 0 === strpos( $short_file_path, $basedir ) ) {
$short_file_path = substr( $short_file_path, strlen( $basedir ) );
}
$real_file = $basedir . $short_file_path;
if ( file_exists( $real_file ) ) {
return array(
'url' => $this->_wp_upload_dir['baseurl'] . '/' . $short_file_path,
'md5' => md5_file( $real_file ),
'size' => filesize( $real_file ),
);
}
/**
* WP Stateless compatibility #143 https://github.com/litespeedtech/lscache_wp/issues/143
*
* @since 2.9.8
* Should return array( 'url', 'md5', 'size' ).
*/
$info = apply_filters( 'litespeed_media_info', [], $short_file_path, $post_id );
if ( ! empty( $info['url'] ) && ! empty( $info['md5'] ) && ! empty( $info['size'] ) ) {
return $info;
}
return false;
}
/**
* Delete media file.
*
* @since 2.9.8
* @access public
*
* @param string $short_file_path Relative file path under uploads.
* @param int $post_id Post ID.
* @return void
*/
public function del( $short_file_path, $post_id ) {
$real_file = $this->_wp_upload_dir['basedir'] . '/' . $short_file_path;
if ( file_exists( $real_file ) ) {
wp_delete_file( $real_file );
self::debug( 'deleted ' . $real_file );
}
do_action( 'litespeed_media_del', $short_file_path, $post_id );
}
/**
* Rename media file.
*
* @since 2.9.8
* @access public
*
* @param string $short_file_path Old relative path.
* @param string $short_file_path_new New relative path.
* @param int $post_id Post ID.
* @return void
*/
public function rename( $short_file_path, $short_file_path_new, $post_id ) {
$real_file = $this->_wp_upload_dir['basedir'] . '/' . $short_file_path;
$real_file_new = $this->_wp_upload_dir['basedir'] . '/' . $short_file_path_new;
if ( file_exists( $real_file ) ) {
global $wp_filesystem;
if ( ! $wp_filesystem ) {
require_once ABSPATH . '/wp-admin/includes/file.php';
\WP_Filesystem();
}
if ( $wp_filesystem ) {
$wp_filesystem->move( $real_file, $real_file_new, true );
}
self::debug( 'renamed ' . $real_file . ' to ' . $real_file_new );
}
do_action( 'litespeed_media_rename', $short_file_path, $short_file_path_new, $post_id );
}
/**
* Media Admin Menu -> Image Optimization Column Title.
*
* @since 1.6.3
* @access public
*
* @param array $posts_columns Existing columns.
* @return array Modified columns.
*/
public function media_row_title( $posts_columns ) {
$posts_columns['imgoptm'] = esc_html__( 'LiteSpeed Optimization', 'litespeed-cache' );
return $posts_columns;
}
/**
* Media Admin Menu -> Image Optimization Column.
*
* @since 1.6.2
* @access public
*
* @param string $column_name Current column name.
* @param int $post_id Post ID.
* @return void
*/
public function media_row_actions( $column_name, $post_id ) {
if ( 'imgoptm' !== $column_name ) {
return;
}
do_action( 'litespeed_media_row', $post_id );
}
/**
* Display image optimization info in the media list row.
*
* @since 3.0
*
* @param int $post_id Attachment post ID.
* @return void
*/
public function media_row_con( $post_id ) {
$att_info = wp_get_attachment_metadata( $post_id );
if ( empty( $att_info['file'] ) ) {
return;
}
$short_path = $att_info['file'];
$size_meta = get_post_meta( $post_id, Img_Optm::DB_SIZE, true );
echo '<p>';
// Original image info.
if ( $size_meta && ! empty( $size_meta['ori_saved'] ) ) {
$percent = (int) ceil( ( (int) $size_meta['ori_saved'] * 100 ) / max( 1, (int) $size_meta['ori_total'] ) );
$extension = pathinfo( $short_path, PATHINFO_EXTENSION );
$bk_file = substr( $short_path, 0, -strlen( $extension ) ) . 'bk.' . $extension;
$bk_optm_file = substr( $short_path, 0, -strlen( $extension ) ) . 'bk.optm.' . $extension;
$link = Utility::build_url( Router::ACTION_IMG_OPTM, 'orig' . $post_id );
$desc = false;
$cls = '';
if ( $this->info( $bk_file, $post_id ) ) {
$curr_status = esc_html__( '(optm)', 'litespeed-cache' );
$desc = esc_attr__( 'Currently using optimized version of file.', 'litespeed-cache' ) . ' ' . esc_attr__( 'Click to switch to original (unoptimized) version.', 'litespeed-cache' );
} elseif ( $this->info( $bk_optm_file, $post_id ) ) {
$cls .= ' litespeed-warning';
$curr_status = esc_html__( '(non-optm)', 'litespeed-cache' );
$desc = esc_attr__( 'Currently using original (unoptimized) version of file.', 'litespeed-cache' ) . ' ' . esc_attr__( 'Click to switch to optimized version.', 'litespeed-cache' );
}
echo wp_kses_post(
GUI::pie_tiny(
$percent,
24,
sprintf(
esc_html__( 'Original file reduced by %1$s (%2$s)', 'litespeed-cache' ),
$percent . '%',
Utility::real_size( $size_meta['ori_saved'] )
),
'left'
)
);
printf(
esc_html__( 'Orig saved %s', 'litespeed-cache' ),
(int) $percent . '%'
);
if ( $desc ) {
printf(
' <a href="%1$s" class="litespeed-media-href %2$s" data-balloon-pos="left" data-balloon-break aria-label="%3$s">%4$s</a>',
esc_url( $link ),
esc_attr( $cls ),
wp_kses_post( $desc ),
esc_html( $curr_status )
);
} else {
printf(
' <span class="litespeed-desc" data-balloon-pos="left" data-balloon-break aria-label="%1$s">%2$s</span>',
esc_attr__( 'Using optimized version of file. ', 'litespeed-cache' ) . ' ' . esc_attr__( 'No backup of original file exists.', 'litespeed-cache' ),
esc_html__( '(optm)', 'litespeed-cache' )
);
}
} elseif ( $size_meta && 0 === (int) $size_meta['ori_saved'] ) {
echo wp_kses_post( GUI::pie_tiny( 0, 24, esc_html__( 'Congratulation! Your file was already optimized', 'litespeed-cache' ), 'left' ) );
printf(
esc_html__( 'Orig %s', 'litespeed-cache' ),
'<span class="litespeed-desc">' . esc_html__( '(no savings)', 'litespeed-cache' ) . '</span>'
);
} else {
echo esc_html__( 'Orig', 'litespeed-cache' ) . '<span class="litespeed-left10">—</span>';
}
echo '</p>';
echo '<p>';
// WebP/AVIF info.
if ( $size_meta && $this->webp_support( true ) && ! empty( $size_meta[ $this->_sys_format . '_saved' ] ) ) {
$is_avif = 'avif' === $this->_sys_format;
$size_meta_saved = $size_meta[ $this->_sys_format . '_saved' ];
$size_meta_total = $size_meta[ $this->_sys_format . '_total' ];
$percent = ceil( ( $size_meta_saved * 100 ) / max( 1, $size_meta_total ) );
$link = Utility::build_url( Router::ACTION_IMG_OPTM, $this->_sys_format . $post_id );
$desc = false;
$cls = '';
if ( $this->info( $short_path . '.' . $this->_sys_format, $post_id ) ) {
$curr_status = esc_html__( '(optm)', 'litespeed-cache' );
$desc = $is_avif
? esc_attr__( 'Currently using optimized version of AVIF file.', 'litespeed-cache' )
: esc_attr__( 'Currently using optimized version of WebP file.', 'litespeed-cache' );
$desc .= ' ' . esc_attr__( 'Click to switch to original (unoptimized) version.', 'litespeed-cache' );
} elseif ( $this->info( $short_path . '.optm.' . $this->_sys_format, $post_id ) ) {
$cls .= ' litespeed-warning';
$curr_status = esc_html__( '(non-optm)', 'litespeed-cache' );
$desc = $is_avif
? esc_attr__( 'Currently using original (unoptimized) version of AVIF file.', 'litespeed-cache' )
: esc_attr__( 'Currently using original (unoptimized) version of WebP file.', 'litespeed-cache' );
$desc .= ' ' . esc_attr__( 'Click to switch to optimized version.', 'litespeed-cache' );
}
echo wp_kses_post(
GUI::pie_tiny(
$percent,
24,
sprintf(
$is_avif ? esc_html__( 'AVIF file reduced by %1$s (%2$s)', 'litespeed-cache' ) : esc_html__( 'WebP file reduced by %1$s (%2$s)', 'litespeed-cache' ),
$percent . '%',
Utility::real_size( $size_meta_saved )
),
'left'
)
);
printf(
$is_avif ? esc_html__( 'AVIF saved %s', 'litespeed-cache' ) : esc_html__( 'WebP saved %s', 'litespeed-cache' ),
'<span>' . esc_html( $percent ) . '%</span>'
);
if ( $desc ) {
printf(
' <a href="%1$s" class="litespeed-media-href %2$s" data-balloon-pos="left" data-balloon-break aria-label="%3$s">%4$s</a>',
esc_url( $link ),
esc_attr( $cls ),
wp_kses_post( $desc ),
esc_html( $curr_status )
);
} else {
printf(
' <span class="litespeed-desc" data-balloon-pos="left" data-balloon-break aria-label="%1$s %2$s">%3$s</span>',
esc_attr__( 'Using optimized version of file. ', 'litespeed-cache' ),
$is_avif ? esc_attr__( 'No backup of unoptimized AVIF file exists.', 'litespeed-cache' ) : esc_attr__( 'No backup of unoptimized WebP file exists.', 'litespeed-cache' ),
esc_html__( '(optm)', 'litespeed-cache' )
);
}
} else {
echo esc_html( $this->next_gen_image_title() ) . '<span class="litespeed-left10">—</span>';
}
echo '</p>';
// Delete row btn.
if ( $size_meta ) {
printf(
'<div class="row-actions"><span class="delete"><a href="%1$s" class="">%2$s</a></span></div>',
esc_url( Utility::build_url( Router::ACTION_IMG_OPTM, Img_Optm::TYPE_RESET_ROW, false, null, array( 'id' => $post_id ) ) ),
esc_html__( 'Restore from backup', 'litespeed-cache' )
);
echo '</div>';
}
}
/**
* Get wp size info.
*
* NOTE: this is not used because it has to be after admin_init.
*
* @since 1.6.2
* @return array $sizes Data for all currently-registered image sizes.
*/
public function get_image_sizes() {
global $_wp_additional_image_sizes;
$sizes = [];
foreach ( get_intermediate_image_sizes() as $_size ) {
if ( in_array( $_size, array( 'thumbnail', 'medium', 'medium_large', 'large' ), true ) ) {
$sizes[ $_size ]['width'] = get_option( $_size . '_size_w' );
$sizes[ $_size ]['height'] = get_option( $_size . '_size_h' );
$sizes[ $_size ]['crop'] = (bool) get_option( $_size . '_crop' );
} elseif ( isset( $_wp_additional_image_sizes[ $_size ] ) ) {
$sizes[ $_size ] = array(
'width' => $_wp_additional_image_sizes[ $_size ]['width'],
'height' => $_wp_additional_image_sizes[ $_size ]['height'],
'crop' => $_wp_additional_image_sizes[ $_size ]['crop'],
);
}
}
return $sizes;
}
/**
* Exclude role from optimization filter.
*
* @since 1.6.2
* @access public
*
* @param bool $sys_level Return system-level format if true.
* @return string Next-gen format name or empty string.
*/
public function webp_support( $sys_level = false ) {
if ( $sys_level ) {
return $this->_sys_format;
}
return $this->_format; // User level next gen support.
}
/**
* Detect if browser supports next-gen format.
*
* @return bool
*/
private function _browser_support_next_gen() {
$accept = isset( $_SERVER['HTTP_ACCEPT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_ACCEPT'] ) ) : '';
if ( $accept ) {
if ( false !== strpos( $accept, 'image/' . $this->_sys_format ) ) {
return true;
}
}
$ua = isset( $_SERVER['HTTP_USER_AGENT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ) : '';
if ( $ua ) {
$user_agents = array( 'chrome-lighthouse', 'googlebot', 'page speed' );
foreach ( $user_agents as $user_agent ) {
if ( false !== stripos( $ua, $user_agent ) ) {
return true;
}
}
if ( preg_match( '/iPhone OS (\d+)_/i', $ua, $matches ) ) {
if ( $matches[1] >= 14 ) {
return true;
}
}
if ( preg_match( '/Firefox\/(\d+)/i', $ua, $matches ) ) {
if ( $matches[1] >= 65 ) {
return true;
}
}
}
return false;
}
/**
* Get next gen image title.
*
* @since 7.0
* @return string
*/
public function next_gen_image_title() {
$next_gen_img = 'WebP';
if ( 2 === $this->conf( Base::O_IMG_OPTM_WEBP ) ) {
$next_gen_img = 'AVIF';
}
return $next_gen_img;
}
/**
* Run lazy load process.
* NOTE: As this is after cache finalized, can NOT set any cache control anymore.
*
* Only do for main page. Do NOT do for esi or dynamic content.
*
* @since 1.4
* @access public
*
* @param string $content Final buffer.
* @return string The buffer.
*/
public function finalize( $content ) {
if ( defined( 'LITESPEED_NO_LAZY' ) ) {
self::debug2( 'bypass: NO_LAZY const' );
return $content;
}
if ( ! defined( 'LITESPEED_IS_HTML' ) ) {
self::debug2( 'bypass: Not frontend HTML type' );
return $content;
}
if ( ! Control::is_cacheable() ) {
self::debug( 'bypass: Not cacheable' );
return $content;
}
self::debug( 'finalize' );
$this->content = $content;
$this->_finalize();
return $this->content;
}
/**
* Run lazyload replacement for images in buffer.
*
* @since 1.4
* @access private
* @return void
*/
private function _finalize() {
/**
* Use webp for optimized images.
*
* @since 1.6.2
*/
if ( $this->webp_support() ) {
$this->content = $this->_replace_buffer_img_webp( $this->content );
}
/**
* Check if URI is excluded.
*
* @since 3.0
*/
$excludes = $this->conf( Base::O_MEDIA_LAZY_URI_EXC );
if ( ! defined( 'LITESPEED_GUEST_OPTM' ) ) {
$request_uri = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
$result = $request_uri ? Utility::str_hit_array( $request_uri, $excludes ) : false;
if ( $result ) {
self::debug( 'bypass lazyload: hit URI Excludes setting: ' . $result );
return;
}
}
$cfg_lazy = ( defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_MEDIA_LAZY ) ) && ! $this->cls( 'Metabox' )->setting( 'litespeed_no_image_lazy' );
$cfg_iframe_lazy = defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_MEDIA_IFRAME_LAZY );
$cfg_js_delay = defined( 'LITESPEED_GUEST_OPTM' ) || 2 === $this->conf( Base::O_OPTM_JS_DEFER );
$cfg_trim_noscript = defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_OPTM_NOSCRIPT_RM );
$cfg_vpi = defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_MEDIA_VPI );
// Preload VPI.
if ( $cfg_vpi ) {
$this->_parse_img_for_preload();
}
if ( $cfg_lazy ) {
if ( $cfg_vpi ) {
add_filter( 'litespeed_media_lazy_img_excludes', array( $this->cls( 'Metabox' ), 'lazy_img_excludes' ) );
}
list( $src_list, $html_list, $placeholder_list ) = $this->_parse_img();
$html_list_ori = $html_list;
} else {
self::debug( 'lazyload disabled' );
}
// image lazy load.
if ( $cfg_lazy ) {
$__placeholder = Placeholder::cls();
foreach ( $html_list as $k => $v ) {
$size = $placeholder_list[ $k ];
$src = $src_list[ $k ];
$html_list[ $k ] = $__placeholder->replace( $v, $src, $size );
}
}
if ( $cfg_lazy ) {
$this->content = str_replace( $html_list_ori, $html_list, $this->content );
}
// iframe lazy load.
if ( $cfg_iframe_lazy ) {
$html_list = $this->_parse_iframe();
$html_list_ori = $html_list;
foreach ( $html_list as $k => $v ) {
$snippet = $cfg_trim_noscript ? '' : '<noscript>' . $v . '</noscript>';
if ( $cfg_js_delay ) {
$v = str_replace( ' src=', ' data-litespeed-src=', $v );
} else {
$v = str_replace( ' src=', ' data-src=', $v );
}
$v = str_replace( '<iframe ', '<iframe data-lazyloaded="1" src="about:blank" ', $v );
$snippet = $v . $snippet;
$html_list[ $k ] = $snippet;
}
$this->content = str_replace( $html_list_ori, $html_list, $this->content );
}
// Include lazyload lib js and init lazyload.
if ( $cfg_lazy || $cfg_iframe_lazy ) {
$lazy_lib = '<script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:' . apply_filters( 'litespeed_lazyload_threshold', 300 ) . '},window.lazyLoadOptions||{});' . File::read( LSCWP_DIR . self::LIB_FILE_IMG_LAZYLOAD ) . '</script>';
if ( $cfg_js_delay ) {
// Load JS delay lib.
if ( ! defined( 'LITESPEED_JS_DELAY_LIB_LOADED' ) ) {
define( 'LITESPEED_JS_DELAY_LIB_LOADED', true );
$lazy_lib .= '<script data-no-optimize="1">' . File::read( LSCWP_DIR . Optimize::LIB_FILE_JS_DELAY ) . '</script>';
}
}
$this->content = str_replace( '</body>', $lazy_lib . '</body>', $this->content );
}
}
/**
* Parse img src for VPI preload only.
* Note: Didn't reuse the _parse_img() because it contains replacement logic which is not needed for preload.
*
* @since 6.2
* @since 7.6 - Added attributes fetchpriority="high" and decode="sync" for VPI images.
* @return void
*/
private function _parse_img_for_preload() {
// Load VPI setting.
$is_mobile = $this->_separate_mobile();
$vpi_files = $this->cls( 'Metabox' )->setting( $is_mobile ? VPI::POST_META_MOBILE : VPI::POST_META );
if ( $vpi_files ) {
$vpi_files = Utility::sanitize_lines( $vpi_files, 'basename' );
}
if ( ! $vpi_files ) {
return;
}
if ( ! $this->content ) {
return;
}
$content = preg_replace( array( '#<!--.*-->#sU', '#<noscript([^>]*)>.*</noscript>#isU' ), '', $this->content );
if ( ! $content ) {
return;
}
$vpi_fp_search = [];
$vpi_fp_replace = [];
preg_match_all('#<img\s+([^>]+)/?>#isU', $content, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$attrs = Utility::parse_attr($match[1]);
if ( empty( $attrs['src'] ) ) {
continue;
}
if ( false !== strpos( $attrs['src'], 'base64' ) || 0 === strpos( $attrs['src'], 'data:' ) ) {
self::debug2( 'lazyload bypassed base64 img' );
continue;
}
if ( false !== strpos( $attrs['src'], '{' ) ) {
self::debug2( 'image src has {} ' . $attrs['src'] );
continue;
}
// If the src contains VPI filename, then preload it.
if ( ! Utility::str_hit_array( $attrs['src'], $vpi_files ) ) {
continue;
}
self::debug2( 'VPI preload found and matched: ' . $attrs['src'] );
$this->_vpi_preload_list[] = $attrs['src'];
// Add attributes fetchpriority="high" and decode="sync"
// after WP 6.3.0 use: wp_img_tag_add_loading_optimization_attrs().
$new_html = [];
$attrs[ 'fetchpriority' ] = 'high';
$attrs[ 'decoding' ] = 'sync';
// create html with new attributes.
foreach ( $attrs as $k => $attr ) {
$new_html[] = $k . '="' . $attr . '"';
}
if ( $new_html ) {
$vpi_fp_search[] = $match[1];
$vpi_fp_replace[] = implode( ' ', $new_html);
}
}
// if VPI fetchpriority changes, do the replacement
if ( $vpi_fp_search && $vpi_fp_replace ) {
$this->content = str_replace( $vpi_fp_search, $vpi_fp_replace, $this->content );
}
unset( $vpi_fp_search );
unset( $vpi_fp_replace );
}
/**
* Parse img src.
*
* @since 1.4
* @access private
* @return array{0:array,1:array,2:array} All the src & related raw html list with placeholders.
*/
private function _parse_img() {
/**
* Exclude list.
*
* @since 1.5
* @since 2.7.1 Changed to array.
*/
$excludes = apply_filters( 'litespeed_media_lazy_img_excludes', $this->conf( Base::O_MEDIA_LAZY_EXC ) );
$cls_excludes = apply_filters( 'litespeed_media_lazy_img_cls_excludes', $this->conf( Base::O_MEDIA_LAZY_CLS_EXC ) );
$cls_excludes[] = 'skip-lazy'; // https://core.trac.wordpress.org/ticket/44427
$src_list = [];
$html_list = [];
$placeholder_list = [];
$content = preg_replace(
array(
'#<!--.*-->#sU',
'#<noscript([^>]*)>.*</noscript>#isU',
'#<script([^>]*)>.*</script>#isU', // Remove script to avoid false matches and warnings, when image size detection is turned ON.
),
'',
$this->content
);
/**
* Exclude parent classes.
*
* @since 3.0
*/
$parent_cls_exc = apply_filters( 'litespeed_media_lazy_img_parent_cls_excludes', $this->conf( Base::O_MEDIA_LAZY_PARENT_CLS_EXC ) );
if ( $parent_cls_exc ) {
self::debug2( 'Lazyload Class excludes', $parent_cls_exc );
foreach ( $parent_cls_exc as $v ) {
$content = preg_replace('#<(\w+) [^>]*class=(\'|")[^\'"]*' . preg_quote($v, '#') . '[^\'"]*\2[^>]*>.*</\1>#sU', '', $content);
}
}
preg_match_all( '#<img\s+([^>]+)/?>#isU', $content, $matches, PREG_SET_ORDER );
foreach ( $matches as $match ) {
$attrs = Utility::parse_attr( $match[1] );
if ( empty( $attrs['src'] ) ) {
continue;
}
/**
* Add src validation to bypass base64 img src.
*
* @since 1.6
*/
if ( false !== strpos( $attrs['src'], 'base64' ) || 0 === strpos( $attrs['src'], 'data:' ) ) {
self::debug2( 'lazyload bypassed base64 img' );
continue;
}
self::debug2( 'lazyload found: ' . $attrs['src'] );
if (
! empty( $attrs['data-no-lazy'] ) ||
! empty( $attrs['data-skip-lazy'] ) ||
! empty( $attrs['data-lazyloaded'] ) ||
! empty( $attrs['data-src'] ) ||
! empty( $attrs['data-srcset'] )
) {
self::debug2( 'bypassed' );
continue;
}
$hit = ! empty( $attrs['class'] ) ? Utility::str_hit_array( $attrs['class'], $cls_excludes ) : false;
if ( $hit ) {
self::debug2( 'lazyload image cls excludes [hit] ' . $hit );
continue;
}
/**
* Exclude from lazyload by setting.
*
* @since 1.5
*/
if ( $excludes && Utility::str_hit_array( $attrs['src'], $excludes ) ) {
self::debug2( 'lazyload image exclude ' . $attrs['src'] );
continue;
}
/**
* Excludes invalid image src from buddypress avatar crop.
*
* @see https://wordpress.org/support/topic/lazy-load-breaking-buddypress-upload-avatar-feature
* @since 3.0
*/
if ( false !== strpos( $attrs['src'], '{' ) ) {
self::debug2( 'image src has {} ' . $attrs['src'] );
continue;
}
// to avoid multiple replacement.
if ( in_array( $match[0], $html_list, true ) ) {
continue;
}
// Add missing dimensions.
if ( defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_MEDIA_ADD_MISSING_SIZES ) ) {
if ( ! apply_filters( 'litespeed_media_add_missing_sizes', true ) ) {
self::debug2( 'add_missing_sizes bypassed via litespeed_media_add_missing_sizes filter' );
} elseif ( empty( $attrs['width'] ) || 'auto' === $attrs['width'] || empty( $attrs['height'] ) || 'auto' === $attrs['height'] ) {
self::debug( '⚠️ Missing sizes for image [src] ' . $attrs['src'] );
$dimensions = $this->_detect_dimensions( $attrs['src'] );
if ( $dimensions ) {
$ori_width = $dimensions[0];
$ori_height = $dimensions[1];
// Calculate height based on width.
if ( ! empty( $attrs['width'] ) && 'auto' !== $attrs['width'] ) {
$ori_height = (int) ( ( $ori_height * (int) $attrs['width'] ) / max( 1, $ori_width ) );
} elseif ( ! empty( $attrs['height'] ) && 'auto' !== $attrs['height'] ) {
$ori_width = (int) ( ( $ori_width * (int) $attrs['height'] ) / max( 1, $ori_height ) );
}
$attrs['width'] = $ori_width;
$attrs['height'] = $ori_height;
$new_html = preg_replace( '#\s+(width|height)=(["\'])[^\2]*?\2#', '', $match[0] );
$new_html = preg_replace(
'#<img\s+#i',
'<img width="' . Str::trim_quotes( $attrs['width'] ) . '" height="' . Str::trim_quotes( $attrs['height'] ) . '" ',
$new_html
);
self::debug( 'Add missing sizes ' . $attrs['width'] . 'x' . $attrs['height'] . ' to ' . $attrs['src'] );
$this->content = str_replace( $match[0], $new_html, $this->content );
$match[0] = $new_html;
}
}
}
$placeholder = false;
if ( ! empty( $attrs['width'] ) && 'auto' !== $attrs['width'] && ! empty( $attrs['height'] ) && 'auto' !== $attrs['height'] ) {
$placeholder = (int) $attrs['width'] . 'x' . (int) $attrs['height'];
}
$src_list[] = $attrs['src'];
$html_list[] = $match[0];
$placeholder_list[] = $placeholder;
}
return array( $src_list, $html_list, $placeholder_list );
}
/**
* Detect the original sizes.
*
* @since 4.0
*
* @param string $src Source URL/path.
* @return array|false getimagesize array or false.
*/
private function _detect_dimensions( $src ) {
$pathinfo = Utility::is_internal_file( $src );
if ( $pathinfo ) {
$src = $pathinfo[0];
} elseif ( apply_filters( 'litespeed_media_ignore_remote_missing_sizes', false ) ) {
return false;
}
if ( 0 === strpos( $src, '//' ) ) {
$src = 'https:' . $src;
}
try {
$sizes = getimagesize( $src );
} catch ( \Exception $e ) {
return false;
}
if ( ! empty( $sizes[0] ) && ! empty( $sizes[1] ) ) {
return $sizes;
}
return false;
}
/**
* Parse iframe src.
*
* @since 1.4
* @access private
* @return array All the related raw html list (full <iframe> tags).
*/
private function _parse_iframe() {
$cls_excludes = apply_filters( 'litespeed_media_iframe_lazy_cls_excludes', $this->conf( Base::O_MEDIA_IFRAME_LAZY_CLS_EXC ) );
$cls_excludes[] = 'skip-lazy'; // https://core.trac.wordpress.org/ticket/44427
$html_list = [];
$content = preg_replace( '#<!--.*-->#sU', '', $this->content );
/**
* Exclude parent classes.
*
* @since 3.0
*/
$parent_cls_exc = apply_filters( 'litespeed_media_iframe_lazy_parent_cls_excludes', $this->conf( Base::O_MEDIA_IFRAME_LAZY_PARENT_CLS_EXC ) );
if ( $parent_cls_exc ) {
self::debug2( 'Iframe Lazyload Class excludes', $parent_cls_exc );
foreach ( $parent_cls_exc as $v ) {
$content = preg_replace('#<(\w+) [^>]*class=(\'|")[^\'"]*' . preg_quote($v, '#') . '[^\'"]*\2[^>]*>.*</\1>#sU', '', $content);
}
}
preg_match_all( '#<iframe \s*([^>]+)></iframe>#isU', $content, $matches, PREG_SET_ORDER );
foreach ( $matches as $match ) {
$attrs = Utility::parse_attr( $match[1] );
if ( empty( $attrs['src'] ) ) {
continue;
}
self::debug2( 'found iframe: ' . $attrs['src'] );
if ( ! empty( $attrs['data-no-lazy'] ) || ! empty( $attrs['data-skip-lazy'] ) || ! empty( $attrs['data-lazyloaded'] ) || ! empty( $attrs['data-src'] ) ) {
self::debug2( 'bypassed' );
continue;
}
$hit = ! empty( $attrs['class'] ) ? Utility::str_hit_array( $attrs['class'], $cls_excludes ) : false;
if ( $hit ) {
self::debug2( 'iframe lazyload cls excludes [hit] ' . $hit );
continue;
}
if ( apply_filters( 'litespeed_iframe_lazyload_exc', false, $attrs['src'] ) ) {
self::debug2( 'bypassed by filter' );
continue;
}
// to avoid multiple replacement.
if ( in_array( $match[0], $html_list, true ) ) {
continue;
}
$html_list[] = $match[0];
}
return $html_list;
}
/**
* Replace image src to webp/avif in buffer.
*
* @since 1.6.2
* @access private
*
* @param string $content HTML content.
* @return string Modified content.
*/
private function _replace_buffer_img_webp( $content ) {
/**
* Added custom element & attribute support.
*
* @since 2.2.2
*/
$webp_ele_to_check = $this->conf( Base::O_IMG_OPTM_WEBP_ATTR );
foreach ( $webp_ele_to_check as $v ) {
if ( ! $v || false === strpos( $v, '.' ) ) {
self::debug2( 'buffer_webp no . attribute ' . $v );
continue;
}
self::debug2( 'buffer_webp attribute ' . $v );
$v = explode( '.', $v );
$attr = preg_quote( $v[1], '#' );
if ( $v[0] ) {
$pattern = '#<' . preg_quote( $v[0], '#' ) . '([^>]+)' . $attr . '=([\'"])(.+)\2#iU';
} else {
$pattern = '# ' . $attr . '=([\'"])(.+)\1#iU';
}
preg_match_all( $pattern, $content, $matches );
foreach ( $matches[ $v[0] ? 3 : 2 ] as $k2 => $url ) {
// Check if is a DATA-URI.
if ( false !== strpos( $url, 'data:image' ) ) {
continue;
}
$url2 = $this->replace_webp( $url );
if ( ! $url2 ) {
continue;
}
if ( $v[0] ) {
$html_snippet = sprintf( '<' . $v[0] . '%1$s' . $v[1] . '=%2$s', $matches[1][ $k2 ], $matches[2][ $k2 ] . $url2 . $matches[2][ $k2 ] );
} else {
$html_snippet = sprintf( ' ' . $v[1] . '=%1$s', $matches[1][ $k2 ] . $url2 . $matches[1][ $k2 ] );
}
$content = str_replace( $matches[0][ $k2 ], $html_snippet, $content );
}
}
// parse srcset.
// todo: should apply this to cdn too.
if ( ( defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_IMG_OPTM_WEBP_REPLACE_SRCSET ) ) && $this->webp_support() ) {
$content = Utility::srcset_replace( $content, array( $this, 'replace_webp' ) );
}
// Replace background-image.
if ( ( defined( 'LITESPEED_GUEST_OPTM' ) || $this->conf( Base::O_IMG_OPTM_WEBP ) ) && $this->webp_support() ) {
$content = $this->replace_background_webp( $content );
}
return $content;
}
/**
* Replace background image in inline styles and JSON blobs.
*
* @since 4.0
*
* @param string $content HTML content.
* @return string Modified content.
*/
public function replace_background_webp( $content ) {
self::debug2( 'Start replacing background WebP/AVIF.' );
// Handle Elementor's data-settings JSON encoded background-images.
$content = $this->replace_urls_in_json( $content );
preg_match_all( '#url\(([^)]+)\)#iU', $content, $matches );
foreach ( $matches[1] as $k => $url ) {
// Check if is a DATA-URI.
if ( false !== strpos( $url, 'data:image' ) ) {
continue;
}
/**
* Support quotes in src `background-image: url('src')`.
*
* @since 2.9.3
*/
$url = trim( $url, '\'"' );
// Fix Elementor's Slideshow unusual background images like style="background-image: url("https://xxxx.png");"
if ( 0 === strpos( $url, '"' ) && '"' === substr( $url, -6 ) ) {
$url = substr( $url, 6, -6 );
}
$url2 = $this->replace_webp( $url );
if ( ! $url2 ) {
continue;
}
$html_snippet = str_replace( $url, $url2, $matches[0][ $k ] );
$content = str_replace( $matches[0][ $k ], $html_snippet, $content );
}
return $content;
}
/**
* Replace images in json data settings attributes.
*
* @since 6.2
*
* @param string $content HTML content to scan and modify.
* @return string Modified content with replaced URLs inside JSON attributes.
*/
public function replace_urls_in_json( $content ) {
$pattern = '/data-settings="(.*?)"/i';
$parent_class = $this;
preg_match_all( $pattern, $content, $matches, PREG_SET_ORDER );
foreach ( $matches as $match ) {
// Check if the string contains HTML entities.
$is_encoded = preg_match( '/"|<|>|&|'/', $match[1] );
// Decode HTML entities in the JSON string.
$json_string = html_entity_decode( $match[1] );
$json_data = \json_decode( $json_string, true );
if ( JSON_ERROR_NONE === json_last_error() && is_array( $json_data ) ) {
$did_webp_replace = false;
array_walk_recursive(
$json_data,
/**
* Replace URLs in JSON data recursively.
*
* @param mixed $item Value (modified in place).
* @param string $key Array key.
*/
function ( &$item, $key ) use ( &$did_webp_replace, $parent_class ) {
if ( 'url' === $key ) {
$item_image = $parent_class->replace_webp( $item );
if ( $item_image ) {
$item = $item_image;
$did_webp_replace = true;
}
}
}
);
if ( $did_webp_replace ) {
// Re-encode the modified array back to a JSON string.
$new_json_string = wp_json_encode( $json_data );
// Re-encode the JSON string to HTML entities only if it was originally encoded.
if ( $is_encoded ) {
$new_json_string = htmlspecialchars( $new_json_string, ENT_QUOTES | 0 ); // ENT_HTML401 for PHP>=5.4.
}
// Replace the old JSON string in the content with the new, modified JSON string.
$content = str_replace( $match[1], $new_json_string, $content );
}
}
}
return $content;
}
/**
* Replace internal image src to webp or avif.
*
* @since 1.6.2
* @access public
*
* @param string $url Image URL.
* @return string|false Replaced URL or false if not applicable.
*/
public function replace_webp( $url ) {
if ( ! $this->webp_support() ) {
self::debug2( 'No next generation format chosen in setting, bypassed' );
return false;
}
self::debug2( $this->_sys_format . ' replacing: ' . substr( $url, 0, 200 ) );
if ( substr( $url, -5 ) === '.' . $this->_sys_format ) {
self::debug2( 'already ' . $this->_sys_format );
return false;
}
/**
* WebP/AVIF API hook.
* NOTE: As $url may contain query strings, check filters which may parse_url before appending format.
*
* @since 2.9.5
* @see #751737 - API docs for WebP generation
*/
$ori_check = apply_filters( 'litespeed_media_check_ori', Utility::is_internal_file( $url ), $url );
if ( $ori_check ) {
// check if has webp/avif file.
$has_next = apply_filters( 'litespeed_media_check_webp', Utility::is_internal_file( $url, $this->_sys_format ), $url );
if ( $has_next ) {
$url .= '.' . $this->_sys_format;
} else {
self::debug2( '-no WebP or AVIF file, bypassed' );
return false;
}
} else {
self::debug2( '-no file, bypassed' );
return false;
}
self::debug2( '- replaced to: ' . $url );
return $url;
}
/**
* Hook to wp_get_attachment_image_src.
*
* @since 1.6.2
* @access public
*
* @param array $img The URL, width, height array.
* @return array
*/
public function webp_attach_img_src( $img ) {
self::debug2( 'changing attach src: ' . $img[0] );
$url = $img ? $this->replace_webp( $img[0] ) : false;
if ( $url ) {
$img[0] = $url;
}
return $img;
}
/**
* Try to replace img url.
*
* @since 1.6.2
* @access public
*
* @param string $url Image URL.
* @return string
*/
public function webp_url( $url ) {
$url2 = $url ? $this->replace_webp( $url ) : false;
if ( $url2 ) {
$url = $url2;
}
return $url;
}
/**
* Hook to replace WP responsive images.
*
* @since 1.6.2
* @access public
*
* @param array $srcs Srcset array.
* @return array
*/
public function webp_srcset( $srcs ) {
if ( $srcs ) {
foreach ( $srcs as $w => $data ) {
$url = $this->replace_webp( $data['url'] );
if ( ! $url ) {
continue;
}
$srcs[ $w ]['url'] = $url;
}
}
return $srcs;
}
}