/**
* Regenerate Thumbnails: Attachment regenerator class
*
* @package RegenerateThumbnails
* @since 3.0.0
*/
/**
* Regenerates the thumbnails for a given attachment.
*
* @since 3.0.0
*/
class RegenerateThumbnails_Regenerator {
/**
* The WP_Post object for the attachment that is being operated on.
*
* @since 3.0.0
*
* @var WP_Post
*/
public $attachment;
/**
* The full path to the original image so that it can be passed between methods.
*
* @since 3.0.0
*
* @var string
*/
public $fullsizepath;
/**
* An array of thumbnail size(s) that were skipped during regeneration due to already existing.
* A class variable is used so that the data can later be used to merge the size(s) back in.
*
* @since 3.0.0
*
* @var array
*/
public $skipped_thumbnails = array();
/**
* Generates an instance of this class after doing some setup.
*
* MIME type is purposefully not validated in order to be more future proof and
* to avoid duplicating a ton of logic that already exists in WordPress core.
*
* @since 3.0.0
*
* @param int $attachment_id Attachment ID to process.
*
* @return RegenerateThumbnails_Regenerator|WP_Error A new instance of RegenerateThumbnails_Regenerator on success, or WP_Error on error.
*/
public static function get_instance( $attachment_id ) {
$attachment = get_post( $attachment_id );
if ( ! $attachment ) {
return new WP_Error(
'regenerate_thumbnails_regenerator_attachment_doesnt_exist',
__( 'No attachment exists with that ID.', 'regenerate-thumbnails' ),
array(
'status' => 404,
)
);
}
// We can only regenerate thumbnails for attachments.
if ( 'attachment' !== get_post_type( $attachment ) ) {
return new WP_Error(
'regenerate_thumbnails_regenerator_not_attachment',
__( 'This item is not an attachment.', 'regenerate-thumbnails' ),
array(
'status' => 400,
)
);
}
// Don't touch any attachments that are being used as a site icon. Their thumbnails are usually custom cropped.
if ( self::is_site_icon( $attachment ) ) {
return new WP_Error(
'regenerate_thumbnails_regenerator_is_site_icon',
__( "This attachment is a site icon and therefore the thumbnails shouldn't be touched.", 'regenerate-thumbnails' ),
array(
'status' => 415,
'attachment' => $attachment,
)
);
}
return new RegenerateThumbnails_Regenerator( $attachment );
}
/**
* The constructor for this class. Don't call this directly, see get_instance() instead.
* This is done so that WP_Error objects can be returned during class initiation.
*
* @since 3.0.0
*
* @param WP_Post $attachment The WP_Post object for the attachment that is being operated on.
*/
private function __construct( WP_Post $attachment ) {
$this->attachment = $attachment;
}
/**
* Returns whether the attachment is or was a site icon.
*
* @since 3.0.0
*
* @param WP_Post $attachment The WP_Post object for the attachment that is being operated on.
*
* @return bool Whether the attachment is or was a site icon.
*/
public static function is_site_icon( WP_Post $attachment ) {
return ( 'site-icon' === get_post_meta( $attachment->ID, '_wp_attachment_context', true ) );
}
/**
* Get the path to the fullsize attachment.
*
* @return string|WP_Error The path to the fullsize attachment, or a WP_Error object on error.
*/
public function get_fullsizepath() {
if ( $this->fullsizepath ) {
return $this->fullsizepath;
}
if ( function_exists( 'wp_get_original_image_path' ) ) {
$this->fullsizepath = wp_get_original_image_path( $this->attachment->ID );
} else {
$this->fullsizepath = get_attached_file( $this->attachment->ID );
}
if ( false === $this->fullsizepath || ! file_exists( $this->fullsizepath ) ) {
$error = new WP_Error(
'regenerate_thumbnails_regenerator_file_not_found',
sprintf(
/* translators: The relative upload path to the attachment. */
__( "The fullsize image file cannot be found in your uploads directory at %s. Without it, new thumbnail images can't be generated.", 'regenerate-thumbnails' ),
_wp_relative_upload_path( $this->fullsizepath )
),
array(
'status' => 404,
'fullsizepath' => _wp_relative_upload_path( $this->fullsizepath ),
'attachment' => $this->attachment,
)
);
$this->fullsizepath = $error;
}
return $this->fullsizepath;
}
/**
* Regenerate the thumbnails for this instance's attachment.
*
* @since 3.0.0
*
* @param array|string $args {
* Optional. Array or string of arguments for thumbnail regeneration.
*
* @type bool $only_regenerate_missing_thumbnails Skip regenerating existing thumbnail files. Default true.
* @type bool $delete_unregistered_thumbnail_files Delete any thumbnail sizes that are no longer registered. Default false.
* }
*
* @return mixed|WP_Error Metadata for attachment (see wp_generate_attachment_metadata()), or WP_Error on error.
*/
public function regenerate( $args = array() ) {
global $wpdb;
$args = wp_parse_args( $args, array(
'only_regenerate_missing_thumbnails' => true,
'delete_unregistered_thumbnail_files' => false,
) );
$fullsizepath = $this->get_fullsizepath();
if ( is_wp_error( $fullsizepath ) ) {
$fullsizepath->add_data( array( 'attachment' => $this->attachment ) );
return $fullsizepath;
}
$old_metadata = wp_get_attachment_metadata( $this->attachment->ID );
if ( $args['only_regenerate_missing_thumbnails'] ) {
add_filter( 'intermediate_image_sizes_advanced', array( $this, 'filter_image_sizes_to_only_missing_thumbnails' ), 10, 2 );
}
require_once( ABSPATH . 'wp-admin/includes/admin.php' );
$new_metadata = wp_generate_attachment_metadata( $this->attachment->ID, $fullsizepath );
if ( $args['only_regenerate_missing_thumbnails'] ) {
// Thumbnail sizes that existed were removed and need to be added back to the metadata.
foreach ( $this->skipped_thumbnails as $skipped_thumbnail ) {
if ( ! empty( $old_metadata['sizes'][ $skipped_thumbnail ] ) ) {
$new_metadata['sizes'][ $skipped_thumbnail ] = $old_metadata['sizes'][ $skipped_thumbnail ];
}
}
$this->skipped_thumbnails = array();
remove_filter( 'intermediate_image_sizes_advanced', array( $this, 'filter_image_sizes_to_only_missing_thumbnails' ), 10 );
}
$wp_upload_dir = dirname( $fullsizepath ) . DIRECTORY_SEPARATOR;
if ( $args['delete_unregistered_thumbnail_files'] ) {
// Delete old sizes that are still in the metadata.
$intermediate_image_sizes = get_intermediate_image_sizes();
foreach ( $old_metadata['sizes'] as $old_size => $old_size_data ) {
if ( in_array( $old_size, $intermediate_image_sizes ) ) {
continue;
}
wp_delete_file( $wp_upload_dir . $old_size_data['file'] );
unset( $new_metadata['sizes'][ $old_size ] );
}
$relative_path = dirname( $new_metadata['file'] ) . DIRECTORY_SEPARATOR;
// It's possible to upload an image with a filename like image-123x456.jpg and it shouldn't be deleted.
$whitelist = $wpdb->get_col( $wpdb->prepare( "
SELECT
meta_value
FROM
{$wpdb->postmeta}
WHERE
meta_key = '_wp_attached_file'
AND meta_value REGEXP %s
/* Regenerate Thumbnails */
",
'^' . preg_quote( $relative_path ) . '[^' . preg_quote( DIRECTORY_SEPARATOR ) . ']+-[0-9]+x[0-9]+\.'
) );
$whitelist = array_map( 'basename', $whitelist );
$filelist = array();
foreach ( scandir( $wp_upload_dir ) as $file ) {
if ( '.' == $file || '..' == $file || ! is_file( $wp_upload_dir . $file ) ) {
continue;
}
$filelist[] = $file;
}
$registered_thumbnails = array();
foreach ( $new_metadata['sizes'] as $size ) {
$registered_thumbnails[] = $size['file'];
}
$fullsize_parts = pathinfo( $fullsizepath );
foreach ( $filelist as $file ) {
if ( in_array( $file, $whitelist ) || in_array( $file, $registered_thumbnails ) ) {
continue;
}
if ( ! preg_match( '#^' . preg_quote( $fullsize_parts['filename'], '#' ) . '-[0-9]+x[0-9]+\.' . preg_quote( $fullsize_parts['extension'], '#' ) . '$#', $file ) ) {
continue;
}
wp_delete_file( $wp_upload_dir . $file );
}
} elseif ( ! empty( $old_metadata ) && ! empty( $old_metadata['sizes'] ) && is_array( $old_metadata['sizes'] ) ) {
// If not deleting, rename any size conflicts to avoid them being lost if the file still exists.
foreach ( $old_metadata['sizes'] as $old_size => $old_size_data ) {
if ( empty( $new_metadata['sizes'][ $old_size ] ) ) {
$new_metadata['sizes'][ $old_size ] = $old_metadata['sizes'][ $old_size ];
continue;
}
$new_size_data = $new_metadata['sizes'][ $old_size ];
if (
$new_size_data['width'] !== $old_size_data['width']
&& $new_size_data['height'] !== $old_size_data['height']
&& file_exists( $wp_upload_dir . $old_size_data['file'] )
) {
$new_metadata['sizes'][ $old_size . '_old_' . $old_size_data['width'] . 'x' . $old_size_data['height'] ] = $old_size_data;
}
}
}
wp_update_attachment_metadata( $this->attachment->ID, $new_metadata );
return $new_metadata;
}
/**
* Filters the list of thumbnail sizes to only include those which have missing files.
*
* @since 3.0.0
*
* @param array $sizes An associative array of registered thumbnail image sizes.
* @param array $fullsize_metadata An associative array of fullsize image metadata: width, height, file.
*
* @return array An associative array of image sizes.
*/
public function filter_image_sizes_to_only_missing_thumbnails( $sizes, $fullsize_metadata ) {
if ( ! $sizes ) {
return $sizes;
}
$fullsizepath = $this->get_fullsizepath();
if ( is_wp_error( $fullsizepath ) ) {
return $sizes;
}
$editor = wp_get_image_editor( $fullsizepath );
if ( is_wp_error( $editor ) ) {
return $sizes;
}
$metadata = wp_get_attachment_metadata( $this->attachment->ID );
// This is based on WP_Image_Editor_GD::multi_resize() and others.
foreach ( $sizes as $size => $size_data ) {
if ( empty( $metadata['sizes'][ $size ] ) ) {
continue;
}
if ( ! isset( $size_data['width'] ) && ! isset( $size_data['height'] ) ) {
continue;
}
if ( ! isset( $size_data['width'] ) ) {
$size_data['width'] = null;
}
if ( ! isset( $size_data['height'] ) ) {
$size_data['height'] = null;
}
if ( ! isset( $size_data['crop'] ) ) {
$size_data['crop'] = false;
}
$thumbnail = $this->get_thumbnail(
$editor,
$fullsize_metadata['width'],
$fullsize_metadata['height'],
$size_data['width'],
$size_data['height'],
$size_data['crop']
);
// The false check filters out thumbnails that would be larger than the fullsize image.
// The size comparison makes sure that the size is also correct.
if (
false === $thumbnail
|| (
$thumbnail['width'] === $metadata['sizes'][ $size ]['width']
&& $thumbnail['height'] === $metadata['sizes'][ $size ]['height']
&& file_exists( $thumbnail['filename'] )
)
) {
$this->skipped_thumbnails[] = $size;
unset( $sizes[ $size ] );
}
}
/**
* Filters the list of missing thumbnail sizes if you want to add/remove any.
*
* @since 3.1.0
*
* @param array $sizes An associative array of image sizes that are missing.
* @param array $fullsize_metadata An associative array of fullsize image metadata: width, height, file.
* @param object $this The current instance of this class.
*
* @return array An associative array of image sizes.
*/
return apply_filters( 'regenerate_thumbnails_missing_thumbnails', $sizes, $fullsize_metadata, $this );
}
/**
* Generate the thumbnail filename and dimensions for a given set of constraint dimensions.
*
* @since 3.0.0
*
* @param WP_Image_Editor|WP_Error $editor An instance of WP_Image_Editor, as returned by wp_get_image_editor().
* @param int $fullsize_width The width of the fullsize image.
* @param int $fullsize_height The height of the fullsize image.
* @param int $thumbnail_width The width of the thumbnail.
* @param int $thumbnail_height The height of the thumbnail.
* @param bool $crop Whether to crop or not.
*
* @return array|false An array of the filename, thumbnail width, and thumbnail height,
* or false on failure to resize such as the thumbnail being larger than the fullsize image.
*/
public function get_thumbnail( $editor, $fullsize_width, $fullsize_height, $thumbnail_width, $thumbnail_height, $crop ) {
$dims = image_resize_dimensions( $fullsize_width, $fullsize_height, $thumbnail_width, $thumbnail_height, $crop );
if ( ! $dims ) {
return false;
}
list( , , , , $dst_w, $dst_h ) = $dims;
$suffix = "{$dst_w}x{$dst_h}";
$file_ext = strtolower( pathinfo( $this->get_fullsizepath(), PATHINFO_EXTENSION ) );
return array(
'filename' => $editor->generate_filename( $suffix, null, $file_ext ),
'width' => $dst_w,
'height' => $dst_h,
);
}
/**
* Update the post content of any public post types (posts and pages by default)
* that make use of this attachment.
*
* @since 3.0.0
*
* @param array|string $args {
* Optional. Array or string of arguments for controlling the updating.
*
* @type array $post_type The post types to update. Defaults to public post types (posts and pages by default).
* @type array $post_ids Specific post IDs to update as opposed to any that uses the attachment.
* @type int $posts_per_loop How many posts to query at a time to keep memory usage down. You shouldn't need to modify this.
* }
*
* @return array|WP_Error List of post IDs that were modified. The key is the post ID and the value is either the post ID again or a WP_Error object if wp_update_post() failed.
*/
public function update_usages_in_posts( $args = array() ) {
// Temporarily disabled until it can be even better tested for edge cases
return array();
$args = wp_parse_args( $args, array(
'post_type' => array(),
'post_ids' => array(),
'posts_per_loop' => 10,
) );
if ( empty( $args['post_type'] ) ) {
$args['post_type'] = array_values( get_post_types( array( 'public' => true ) ) );
unset( $args['post_type']['attachment'] );
}
$offset = 0;
$posts_updated = array();
while ( true ) {
$posts = get_posts( array(
'numberposts' => $args['posts_per_loop'],
'offset' => $offset,
'orderby' => 'ID',
'order' => 'ASC',
'include' => $args['post_ids'],
'post_type' => $args['post_type'],
's' => 'wp-image-' . $this->attachment->ID,
// For faster queries.
'update_post_meta_cache' => false,
'update_post_term_cache' => false,
) );
if ( ! $posts ) {
break;
}
$offset += $args['posts_per_loop'];
foreach ( $posts as $post ) {
$content = $post->post_content;
$search = array();
$replace = array();
// Find all ![]()
tags for this attachment and update them.
preg_match_all(
'#![]()
]+wp-image-' . $this->attachment->ID . '[^>]+/>#i',
$content,
$matches,
PREG_SET_ORDER
);
if ( $matches ) {
foreach ( $matches as $img_tag ) {
preg_match( '# class="([^"]+)?size-([^" ]+)#i', $img_tag[0], $thumbnail_size );
if ( $thumbnail_size ) {
$thumbnail = image_downsize( $this->attachment->ID, $thumbnail_size[2] );
if ( ! $thumbnail ) {
continue;
}
$search[] = $img_tag[0];
$img_tag[0] = preg_replace( '# src="[^"]+"#i', ' src="' . esc_url( $thumbnail[0] ) . '"', $img_tag[0] );
$img_tag[0] = preg_replace(
'# width="[^"]+" height="[^"]+"#i',
' width="' . esc_attr( $thumbnail[1] ) . '" height="' . esc_attr( $thumbnail[2] ) . '"',
$img_tag[0]
);
$replace[] = $img_tag[0];
}
}
}
$content = str_replace( $search, $replace, $content );
$search = array();
$replace = array();
// Update the width in any [caption] shortcodes.
preg_match_all(
'#\[caption id="attachment_' . $this->attachment->ID . '"([^\]]+)? width="[^"]+"\]([^\[]+)size-([^" ]+)([^\[]+)\[\/caption\]#i',
$content,
$matches,
PREG_SET_ORDER
);
if ( $matches ) {
foreach ( $matches as $match ) {
$thumbnail = image_downsize( $this->attachment->ID, $match[3] );
if ( ! $thumbnail ) {
continue;
}
$search[] = $match[0];
$replace[] = '[caption id="attachment_' . $this->attachment->ID . '"' . $match[1] . ' width="' . esc_attr( $thumbnail[1] ) . '"]' . $match[2] . 'size-' . $match[3] . $match[4] . '[/caption]';
}
}
$content = str_replace( $search, $replace, $content );
$updated_post_object = (object) array(
'ID' => $post->ID,
'post_content' => $content,
);
$posts_updated[ $post->ID ] = wp_update_post( $updated_post_object, true );
}
}
return $posts_updated;
}
/**
* Returns information about the current attachment for use in the REST API.
*
* @since 3.0.0
*
* @return array|WP_Error The attachment name, fullsize URL, registered thumbnail size status, and any unregistered sizes, or WP_Error on error.
*/
public function get_attachment_info() {
$fullsizepath = $this->get_fullsizepath();
if ( is_wp_error( $fullsizepath ) ) {
$fullsizepath->add_data( array( 'attachment' => $this->attachment ) );
return $fullsizepath;
}
$editor = wp_get_image_editor( $fullsizepath );
if ( is_wp_error( $editor ) ) {
// Display a more helpful error message.
if ( 'image_no_editor' === $editor->get_error_code() ) {
$editor = new WP_Error( 'image_no_editor', __( 'The current image editor cannot process this file type.', 'regenerate-thumbnails' ) );
}
$editor->add_data( array(
'attachment' => $this->attachment,
'status' => 415,
) );
return $editor;
}
$metadata = wp_get_attachment_metadata( $this->attachment->ID );
if ( false === $metadata || ! is_array( $metadata ) ) {
return new WP_Error(
'regenerate_thumbnails_regenerator_no_metadata',
__( 'Unable to load the metadata for this attachment.', 'regenerate-thumbnails' ),
array(
'status' => 404,
'attachment' => $this->attachment,
)
);
}
if ( ! isset( $metadata['sizes'] ) ) {
$metadata['sizes'] = array();
}
// PDFs don't have width/height set.
$width = ( isset( $metadata['width'] ) ) ? $metadata['width'] : null;
$height = ( isset( $metadata['height'] ) ) ? $metadata['height'] : null;
require_once( ABSPATH . '/wp-admin/includes/image.php' );
$preview = false;
if ( file_is_displayable_image( $fullsizepath ) ) {
$preview = wp_get_attachment_url( $this->attachment->ID );
} elseif (
is_array( $metadata['sizes'] ) &&
is_array( $metadata['sizes']['full'] ) &&
! empty( $metadata['sizes']['full']['file'] )
) {
$preview = str_replace(
wp_basename( $fullsizepath ),
$metadata['sizes']['full']['file'],
wp_get_attachment_url( $this->attachment->ID )
);
if ( ! file_exists( $preview ) ) {
$preview = false;
}
}
$response = array(
'name' => ( $this->attachment->post_title ) ? $this->attachment->post_title : sprintf( __( 'Attachment %d', 'regenerate-thumbnails' ), $this->attachment->ID ),
'preview' => $preview,
'relative_path' => _wp_get_attachment_relative_path( $fullsizepath ) . DIRECTORY_SEPARATOR . wp_basename( $fullsizepath ),
'edit_url' => get_edit_post_link( $this->attachment->ID, 'raw' ),
'width' => $width,
'height' => $height,
'registered_sizes' => array(),
'unregistered_sizes' => array(),
);
$wp_upload_dir = dirname( $fullsizepath ) . DIRECTORY_SEPARATOR;
$registered_sizes = RegenerateThumbnails()->get_thumbnail_sizes();
if ( 'application/pdf' === get_post_mime_type( $this->attachment ) ) {
$registered_sizes = array_intersect_key(
$registered_sizes,
array(
'thumbnail' => true,
'medium' => true,
'large' => true,
)
);
}
// Check the status of all currently registered sizes.
foreach ( $registered_sizes as $size ) {
// Width and height are needed to generate the thumbnail filename.
if ( $width && $height ) {
$thumbnail = $this->get_thumbnail( $editor, $width, $height, $size['width'], $size['height'], $size['crop'] );
if ( $thumbnail ) {
$size['filename'] = wp_basename( $thumbnail['filename'] );
$size['fileexists'] = file_exists( $thumbnail['filename'] );
} else {
$size['filename'] = false;
$size['fileexists'] = false;
}
} elseif ( ! empty( $metadata['sizes'][ $size['label'] ]['file'] ) ) {
$size['filename'] = wp_basename( $metadata['sizes'][ $size['label'] ]['file'] );
$size['fileexists'] = file_exists( $wp_upload_dir . $metadata['sizes'][ $size['label'] ]['file'] );
} else {
$size['filename'] = false;
$size['fileexists'] = false;
}
$response['registered_sizes'][] = $size;
}
if ( ! $width && ! $height && is_array( $metadata['sizes']['full'] ) ) {
$response['registered_sizes'][] = array(
'label' => 'full',
'width' => $metadata['sizes']['full']['width'],
'height' => $metadata['sizes']['full']['height'],
'filename' => $metadata['sizes']['full']['file'],
'fileexists' => file_exists( $wp_upload_dir . $metadata['sizes']['full']['file'] ),
);
}
// Look at the attachment metadata and see if we have any extra files from sizes that are no longer registered.
foreach ( $metadata['sizes'] as $label => $size ) {
if ( ! file_exists( $wp_upload_dir . $size['file'] ) ) {
continue;
}
// An unregistered size could match a registered size's dimensions. Ignore these.
foreach ( $response['registered_sizes'] as $registered_size ) {
if ( $size['file'] === $registered_size['filename'] ) {
continue 2;
}
}
if ( ! empty( $registered_sizes[ $label ] ) ) {
/* translators: Used for listing old sizes of currently registered thumbnails */
$label = sprintf( __( '%s (old)', 'regenerate-thumbnails' ), $label );
}
$response['unregistered_sizes'][] = array(
'label' => $label,
'width' => $size['width'],
'height' => $size['height'],
'filename' => $size['file'],
'fileexists' => true,
);
}
return $response;
}
}
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