# gutenberg/23.6.2/lib/media/class-gutenberg-rest-attachments-controller.php

Gutenberg, version 23.6.2. 1,343 lines.

- Page: https://pluginprobe.com/plugins/gutenberg/23.6.2/code/lib/media/class-gutenberg-rest-attachments-controller.php
- Raw: https://pluginprobe.com/plugins/gutenberg/23.6.2/raw/lib/media/class-gutenberg-rest-attachments-controller.php
- Modified: 2026-07-22T11:19:40+00:00

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```php
<?php
/**
 * Class Gutenberg_REST_Attachments_Controller.
 *
 * @package gutenberg
 */

/**
 * REST API controller for media attachments.
 *
 * Extends the core attachments controller to add client-side media processing
 * functionality including sideload support and sub-size generation control.
 */
class Gutenberg_REST_Attachments_Controller extends WP_REST_Attachments_Controller {
	/**
	 * Image size token for the source-format original preserved alongside a
	 * client-generated derivative (e.g. the HEIC file kept next to its JPEG).
	 *
	 * Used both in the `/sideload` route schema and when dispatching the
	 * sideloaded file to its metadata key, so the two never drift apart.
	 *
	 * @var string
	 */
	const IMAGE_SIZE_SOURCE_ORIGINAL = 'source_original';

	/**
	 * Metadata key holding the basename of the source-format original.
	 *
	 * Deliberately specific so it never collides with the generic `original`
	 * or `original_image` keys other flows write to.
	 *
	 * @var string
	 */
	const META_KEY_SOURCE_IMAGE = 'source_image';

	/**
	 * Image size token for the video transcoded from an animated GIF, sideloaded
	 * as a companion of the GIF attachment.
	 *
	 * Paired with META_KEY_ANIMATED_VIDEO: used both in the `/sideload` route
	 * and when writing the sideloaded file to its metadata key. Both use the
	 * underscore convention so the size token and meta key stay consistent.
	 *
	 * @var string
	 */
	const IMAGE_SIZE_ANIMATED_VIDEO = 'animated_video';

	/**
	 * Image size token for the static first-frame poster of a converted GIF.
	 *
	 * @var string
	 */
	const IMAGE_SIZE_ANIMATED_VIDEO_POSTER = 'animated_video_poster';

	/**
	 * Metadata key holding the basename of the converted animated-GIF video.
	 *
	 * @var string
	 */
	const META_KEY_ANIMATED_VIDEO = 'animated_video';

	/**
	 * Metadata key holding the basename of the converted GIF's poster image.
	 *
	 * @var string
	 */
	const META_KEY_ANIMATED_VIDEO_POSTER = 'animated_video_poster';

	/**
	 * Registers the routes for attachments.
	 *
	 * @see register_rest_route()
	 */
	public function register_routes(): void {
		parent::register_routes();

		register_rest_route(
			$this->namespace,
			'/' . $this->rest_base . '/(?P<id>[\d]+)/sideload',
			array(
				array(
					'methods'             => WP_REST_Server::CREATABLE,
					'callback'            => array( $this, 'sideload_item' ),
					'permission_callback' => array( $this, 'sideload_item_permissions_check' ),
					'args'                => array(
						'id'             => array(
							'description' => __( 'Unique identifier for the attachment.', 'gutenberg' ),
							'type'        => 'integer',
						),
						'image_size'     => array(
							'description'       => __( 'Image size. Can be a single size name or an array of size names to register the same file under multiple sizes.', 'gutenberg' ),
							'type'              => array( 'string', 'array' ),
							'items'             => array(
								'type' => 'string',
							),
							'required'          => true,
							// A custom callback is used instead of the default `rest_validate_request_arg`
							// because WordPress's `rest_is_array()` treats scalar strings as single-element
							// lists (via wp_parse_list), so a oneOf with both a string and array schema
							// matches a plain string twice and validation fails with "matches more than one
							// of the expected formats". The callback validates the enum per-item using the
							// current list of registered sizes, which reflects any sizes added after the
							// route was registered (e.g. via add_image_size() in tests).
							'validate_callback' => static function ( $value, $request, $param ) {
								$valid_sizes   = array_keys( wp_get_registered_image_subsizes() );
								$valid_sizes[] = 'original';
								$valid_sizes[] = self::IMAGE_SIZE_SOURCE_ORIGINAL;
								$valid_sizes[] = self::IMAGE_SIZE_ANIMATED_VIDEO;
								$valid_sizes[] = self::IMAGE_SIZE_ANIMATED_VIDEO_POSTER;
								$valid_sizes[] = 'scaled';
								$valid_sizes[] = 'full';

								$items = is_string( $value ) ? array( $value ) : ( is_array( $value ) ? $value : null );
								if ( null === $items ) {
									return new WP_Error(
										'rest_invalid_type',
										/* translators: %s: Parameter name. */
										sprintf( __( '%s must be a string or an array of strings.', 'gutenberg' ), $param )
									);
								}

								foreach ( $items as $item ) {
									if ( ! is_string( $item ) || ! in_array( $item, $valid_sizes, true ) ) {
										return new WP_Error(
											'rest_not_in_enum',
											/* translators: %s: Parameter name. */
											sprintf( __( '%s contains an invalid image size.', 'gutenberg' ), $param )
										);
									}
								}

								return true;
							},
						),
						'convert_format' => array(
							'description' => __( 'Whether to convert image formats.', 'gutenberg' ),
							'type'        => 'boolean',
							'default'     => true,
						),
					),
				),
				'allow_batch' => $this->allow_batch,
				'schema'      => array( $this, 'get_public_item_schema' ),
			),
			true // Override core's route so 'scaled' is included in the enum.
		);

		register_rest_route(
			$this->namespace,
			'/' . $this->rest_base . '/(?P<id>[\d]+)/finalize',
			array(
				array(
					'methods'             => WP_REST_Server::CREATABLE,
					'callback'            => array( $this, 'finalize_item' ),
					'permission_callback' => array( $this, 'edit_media_item_permissions_check' ),
					'args'                => array(
						'id'        => array(
							'description' => __( 'Unique identifier for the attachment.', 'gutenberg' ),
							'type'        => 'integer',
						),
						'sub_sizes' => array(
							'description' => __( 'Array of sub-size metadata collected from sideload responses.', 'gutenberg' ),
							'type'        => 'array',
							'default'     => array(),
							'items'       => array(
								'type'       => 'object',
								'properties' => array(
									'image_size'     => array(
										// Uses a multi-type schema instead of `oneOf` because WordPress's
										// `rest_is_array()` treats scalar strings as single-element lists,
										// so both a `{type: string}` and `{type: array}` oneOf schema would
										// match a plain string and trigger a "matches more than one"
										// validation error.
										'description' => __( 'Size name, or an array of size names when a single file is registered under multiple sizes with matching dimensions.', 'gutenberg' ),
										'type'        => array( 'string', 'array' ),
										'items'       => array(
											'type' => 'string',
										),
										'required'    => true,
									),
									'width'          => array(
										'type'    => 'integer',
										'minimum' => 1,
									),
									'height'         => array(
										'type'    => 'integer',
										'minimum' => 1,
									),
									'file'           => array(
										'type'      => 'string',
										'minLength' => 1,
									),
									'mime_type'      => array(
										'type'    => 'string',
										'pattern' => '^image/.*',
									),
									'filesize'       => array(
										'type'    => 'integer',
										'minimum' => 1,
									),
									'original_image' => array(
										'type'      => 'string',
										'minLength' => 1,
									),
								),
							),
						),
					),
				),
				'allow_batch' => $this->allow_batch,
				'schema'      => array( $this, 'get_public_item_schema' ),
			)
		);
	}

	/**
	 * Checks if a given request has access to create an attachment.
	 *
	 * Skips the server-side image type support check when the client
	 * will handle image processing (generate_sub_sizes is false). Still
	 * HEIC/HEIF uploads always skip the check, since the browser's canvas
	 * fallback can decode them even when the server cannot.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has access to create items, WP_Error object otherwise.
	 */
	public function create_item_permissions_check( $request ) {
		$bypass_mime_check = false === $request['generate_sub_sizes'];

		/*
		 * Always allow still HEIC/HEIF uploads through even if the server's
		 * image editor doesn't support them. The client-side canvas fallback
		 * handles processing using the browser's native HEVC decoder.
		 *
		 * The '-sequence' variants (multi-frame Live Photos) are deliberately
		 * excluded: neither the server nor the browser fallback can process
		 * them yet, so they should fall through to the standard unsupported
		 * mime-type error rather than be stored unprocessable.
		 */
		if ( ! $bypass_mime_check ) {
			$still_heic_mime_types = array( 'image/heic', 'image/heif' );
			$files                 = $request->get_file_params();

			if (
				! empty( $files['file']['type'] ) &&
				in_array( $files['file']['type'], $still_heic_mime_types, true )
			) {
				$bypass_mime_check = true;
			}
		}

		if ( $bypass_mime_check ) {
			add_filter( 'wp_prevent_unsupported_mime_type_uploads', '__return_false' );
		}

		$result = parent::create_item_permissions_check( $request );

		if ( $bypass_mime_check ) {
			remove_filter( 'wp_prevent_unsupported_mime_type_uploads', '__return_false' );
		}

		return $result;
	}

	/**
	 * Retrieves an array of endpoint arguments from the item schema for the controller.
	 *
	 * @param string $method Optional. HTTP method of the request. The arguments for `CREATABLE` requests are
	 *                       checked for required values and may fall-back to a given default, this is not done
	 *                       on `EDITABLE` requests. Default WP_REST_Server::CREATABLE.
	 * @return array<string, array<string, mixed>> Endpoint arguments keyed by argument name.
	 */
	public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
		$args = rest_get_endpoint_args_for_schema( $this->get_item_schema(), $method );

		if ( WP_REST_Server::CREATABLE === $method ) {
			$args['generate_sub_sizes'] = array(
				'type'        => 'boolean',
				'default'     => true,
				'description' => __( 'Whether to generate image sub sizes.', 'gutenberg' ),
			);
			$args['convert_format']     = array(
				'type'        => 'boolean',
				'default'     => true,
				'description' => __( 'Whether to convert image formats.', 'gutenberg' ),
			);
			$args['url']                = array(
				'type'              => 'string',
				'format'            => 'uri',
				'description'       => __( 'URL of an external image to sideload into the media library, instead of uploading a file.', 'gutenberg' ),
				'sanitize_callback' => 'sanitize_url',
				'validate_callback' => static function ( $url, WP_REST_Request $request, string $param ) {
					/*
					 * A custom validate_callback replaces the default
					 * rest_validate_request_arg(), so re-apply it first to keep
					 * the schema checks (string type, uri format) enforced.
					 */
					$valid = rest_validate_request_arg( $url, $request, $param );
					if ( is_wp_error( $valid ) ) {
						return $valid;
					}
					/** @var non-empty-string $url */

					/*
					 * Reject URLs that are not safe to request server-side. wp_http_validate_url()
					 * enforces an HTTP(S) scheme and blocks private, local, and otherwise
					 * disallowed hosts, guarding the sideload against SSRF.
					 */
					if ( false === wp_http_validate_url( $url ) ) {
						return new WP_Error(
							'rest_invalid_url',
							__( 'Invalid URL. Provide a valid, publicly reachable HTTP or HTTPS image URL.', 'gutenberg' ),
							array( 'status' => 400 )
						);
					}

					return true;
				},
			);
		}

		return $args;
	}

	/**
	 * Retrieves the attachment's schema, conforming to JSON Schema.
	 *
	 * Adds exif_orientation field to the schema.
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		$schema = parent::get_item_schema();

		$schema['properties']['exif_orientation'] = array(
			'description' => __( 'EXIF orientation value from the original image. Values 1-8 follow the EXIF specification. A value other than 1 indicates the image needs rotation.', 'gutenberg' ),
			'type'        => 'integer',
			'context'     => array( 'edit' ),
			'readonly'    => true,
		);

		$schema['properties']['image_output_format'] = array(
			'description' => __( 'The output MIME type this image should be converted to, based on the image_editor_output_format filter. Null if no conversion is needed.', 'gutenberg' ),
			'type'        => array( 'string', 'null' ),
			'context'     => array( 'edit' ),
			'readonly'    => true,
		);

		$schema['properties']['image_save_progressive'] = array(
			'description' => __( 'Whether to use progressive/interlaced encoding when saving this image.', 'gutenberg' ),
			'type'        => 'boolean',
			'context'     => array( 'edit' ),
			'readonly'    => true,
		);

		// Enumerate the registered sub-sizes so the schema documents exactly which
		// keys may appear under "sizes".
		$size_quality_properties = array();
		foreach ( array_keys( wp_get_registered_image_subsizes() ) as $size_name ) {
			$size_quality_properties[ $size_name ] = array(
				'type'    => 'integer',
				'minimum' => 1,
				'maximum' => 100,
			);
		}

		$schema['properties']['image_quality'] = array(
			'description' => __( 'Encode quality (1-100) from the wp_editor_set_quality filter, resolved against the output MIME type. "default" applies to the full-size image; "sizes" lists per-registered-size overrides where the filtered value differs from "default".', 'gutenberg' ),
			'type'        => 'object',
			'context'     => array( 'edit' ),
			'readonly'    => true,
			'properties'  => array(
				'default' => array(
					'type'    => 'integer',
					'minimum' => 1,
					'maximum' => 100,
				),
				'sizes'   => array(
					'type'       => 'object',
					'properties' => $size_quality_properties,
				),
			),
		);

		return $schema;
	}

	/**
	 * Prepares a single attachment output for response.
	 *
	 * Ensures 'missing_image_sizes' is set for PDFs and not just images.
	 * Adds 'exif_orientation' for images that need client-side rotation.
	 *
	 * @param WP_Post         $item    Attachment object.
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $item, $request ): WP_REST_Response {
		$response = parent::prepare_item_for_response( $item, $request );

		$data = $response->get_data();

		$fields = $this->get_fields_for_response( $request );

		// Add EXIF orientation for images.
		if ( rest_is_field_included( 'exif_orientation', $fields ) ) {
			if ( wp_attachment_is_image( $item ) ) {
				$metadata = wp_get_attachment_metadata( $item->ID, true );

				// Get the EXIF orientation from the image metadata.
				// This is stored by wp_read_image_metadata() during upload.
				// Values:
				//   0 = undefined (no EXIF data), treat as no rotation needed
				//   1 = normal (no rotation needed)
				//   2-8 = various rotations/flips needed
				$orientation = 1; // Default: no rotation needed.
				if (
					is_array( $metadata ) &&
					isset( $metadata['image_meta']['orientation'] ) &&
					(int) $metadata['image_meta']['orientation'] > 0
				) {
					$orientation = (int) $metadata['image_meta']['orientation'];
				}

				$data['exif_orientation'] = $orientation;
			}
		}

		// Add per-file output format for images.
		if ( rest_is_field_included( 'image_output_format', $fields ) ) {
			if ( wp_attachment_is_image( $item ) ) {
				$mime_type = get_post_mime_type( $item );
				$filename  = get_attached_file( $item->ID );

				/** This filter is documented in wp-includes/class-wp-image-editor.php */
				$output_formats = apply_filters(
					'image_editor_output_format', // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
					array( $mime_type => $mime_type ),
					$filename ? $filename : '',
					$mime_type
				);

				$output_mime                 = $output_formats[ $mime_type ] ?? $mime_type;
				$data['image_output_format'] = ( $output_mime !== $mime_type ) ? $output_mime : null;
			}
		}

		// Add progressive/interlaced encoding setting for images.
		if ( rest_is_field_included( 'image_save_progressive', $fields ) ) {
			if ( wp_attachment_is_image( $item ) ) {
				$mime_type = get_post_mime_type( $item );

				/** This filter is documented in wp-includes/class-wp-image-editor-imagick.php */
				$data['image_save_progressive'] = (bool) apply_filters(
					'image_save_progressive', // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
					false,
					$mime_type
				);
			}
		}

		// Add per-file, size-aware encode quality for images.
		if ( rest_is_field_included( 'image_quality', $fields ) ) {
			if ( wp_attachment_is_image( $item ) ) {
				$mime_type = (string) get_post_mime_type( $item );
				$filename  = get_attached_file( $item->ID );

				// Resolve the output MIME type the same way core's
				// WP_Image_Editor::set_quality() does: quality is filtered
				// against the format the file will actually be saved as.
				/** This filter is documented in wp-includes/class-wp-image-editor.php */
				$output_formats = apply_filters(
					'image_editor_output_format', // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
					array( $mime_type => $mime_type ),
					$filename ? $filename : '',
					$mime_type
				);
				$output_mime    = $output_formats[ $mime_type ] ?? $mime_type;

				$metadata    = wp_get_attachment_metadata( $item->ID, true );
				$full_width  = max( 0, ( is_array( $metadata ) && isset( $metadata['width'] ) ) ? (int) $metadata['width'] : 0 );
				$full_height = max( 0, ( is_array( $metadata ) && isset( $metadata['height'] ) ) ? (int) $metadata['height'] : 0 );

				$full_quality = $this->get_image_encode_quality(
					$output_mime,
					array(
						'width'  => $full_width,
						'height' => $full_height,
					)
				);

				$size_quality = array();
				foreach ( wp_get_registered_image_subsizes() as $size_name => $size_data ) {
					$quality = $this->get_image_encode_quality(
						$output_mime,
						array(
							'width'  => (int) $size_data['width'],
							'height' => (int) $size_data['height'],
						)
					);

					// Only report sizes that diverge from the full-size value
					// to keep the response payload small.
					if ( $quality !== $full_quality ) {
						$size_quality[ $size_name ] = $quality;
					}
				}

				$data['image_quality'] = array(
					'default' => $full_quality,
					'sizes'   => $size_quality,
				);
			}
		}

		if (
			rest_is_field_included( 'missing_image_sizes', $fields ) &&
			empty( $data['missing_image_sizes'] )
		) {
			$mime_type = get_post_mime_type( $item );

			if ( 'application/pdf' === $mime_type ) {
				$metadata = wp_get_attachment_metadata( $item->ID, true );

				if ( ! is_array( $metadata ) ) {
					$metadata = array();
				}

				$metadata['sizes'] = $metadata['sizes'] ?? array();

				$fallback_sizes = array(
					'thumbnail',
					'medium',
					'large',
				);

				// The filter might have been added by ::create_item().
				remove_filter( 'fallback_intermediate_image_sizes', '__return_empty_array', 100 );

				/** This filter is documented in wp-admin/includes/image.php */
				$fallback_sizes = apply_filters( 'fallback_intermediate_image_sizes', $fallback_sizes, $metadata ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound

				$registered_sizes = wp_get_registered_image_subsizes();
				$merged_sizes     = array_keys( array_intersect_key( $registered_sizes, array_flip( $fallback_sizes ) ) );

				$missing_image_sizes         = array_diff( $merged_sizes, array_keys( $metadata['sizes'] ) );
				$data['missing_image_sizes'] = $missing_image_sizes;
			}
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		$links = $response->get_links();

		$response = rest_ensure_response( $data );

		foreach ( $links as $rel => $rel_links ) {
			foreach ( $rel_links as $link ) {
				$response->add_link( $rel, $link['href'], $link['attributes'] );
			}
		}

		return $response;
	}

	/**
	 * Creates a single attachment.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
	 */
	public function create_item( $request ) {
		if ( ! $request['generate_sub_sizes'] ) {
			add_filter( 'intermediate_image_sizes_advanced', '__return_empty_array', 100 );
			add_filter( 'fallback_intermediate_image_sizes', '__return_empty_array', 100 );
			// Disable server-side EXIF rotation so the client can handle it.
			// This preserves the original orientation value in the metadata.
			add_filter( 'wp_image_maybe_exif_rotate', '__return_false', 100 );
			// Disable server-side big image scaling since the client handles it.
			add_filter( 'big_image_size_threshold', '__return_zero', 100 );
		}

		if ( ! $request['convert_format'] ) {
			add_filter( 'image_editor_output_format', '__return_empty_array', 100 );
		}

		/*
		 * When a URL is supplied instead of an uploaded file, sideload the
		 * remote image on the server. This avoids a cross-origin browser fetch,
		 * which fails under cross-origin isolation. The sub-size and scaling
		 * filters applied above still govern whether derivatives are generated.
		 */
		if ( ! empty( $request['url'] ) ) {
			$response = $this->create_item_from_url( $request );
		} else {
			$response = parent::create_item( $request );
		}

		remove_filter( 'intermediate_image_sizes_advanced', '__return_empty_array', 100 );
		remove_filter( 'fallback_intermediate_image_sizes', '__return_empty_array', 100 );
		remove_filter( 'wp_image_maybe_exif_rotate', '__return_false', 100 );
		remove_filter( 'big_image_size_threshold', '__return_zero', 100 );
		remove_filter( 'image_editor_output_format', '__return_empty_array', 100 );

		// Recompute image_output_format now that __return_empty_array is removed.
		if ( ! is_wp_error( $response ) ) {
			$data = $response->get_data();
			if ( ! empty( $data['id'] ) && wp_attachment_is_image( $data['id'] ) ) {
				$mime_type = get_post_mime_type( $data['id'] );
				$filename  = get_attached_file( $data['id'] );

				/** This filter is documented in wp-includes/class-wp-image-editor.php */
				$output_formats = apply_filters(
					'image_editor_output_format', // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
					array( $mime_type => $mime_type ),
					$filename ? $filename : '',
					$mime_type
				);

				$output_mime                 = $output_formats[ $mime_type ] ?? $mime_type;
				$data['image_output_format'] = ( $output_mime !== $mime_type ) ? $output_mime : null;

				/** This filter is documented in wp-includes/class-wp-image-editor-imagick.php */
				$data['image_save_progressive'] = (bool) apply_filters(
					'image_save_progressive', // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
					false,
					$mime_type
				);

				$response->set_data( $data );
			}
		}

		return $response;
	}

	/**
	 * Sideloads an external image from a URL into the media library.
	 *
	 * Downloads the remote file on the server, avoiding a cross-origin browser
	 * fetch that fails under cross-origin isolation. Whether sub-sizes are
	 * generated is governed by the filters applied in create_item().
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
	 */
	protected function create_item_from_url( $request ) {
		// Sideloading downloads and stores a file, so require the upload capability.
		if ( ! current_user_can( 'upload_files' ) ) {
			return new WP_Error(
				'rest_cannot_create',
				__( 'Sorry, you are not allowed to upload media on this site.', 'gutenberg' ),
				array( 'status' => rest_authorization_required_code() )
			);
		}

		require_once ABSPATH . 'wp-admin/includes/file.php';
		require_once ABSPATH . 'wp-admin/includes/media.php';
		require_once ABSPATH . 'wp-admin/includes/image.php';

		$url     = $request['url'];
		$post_id = ! empty( $request['post'] ) ? (int) $request['post'] : 0;

		// Derive the filename from the URL path before downloading anything.
		$url_path = wp_parse_url( $url, PHP_URL_PATH );
		$filename = $url_path ? wp_basename( $url_path ) : '';
		if ( '' === $filename ) {
			return new WP_Error(
				'rest_invalid_url',
				__( 'Could not determine a filename from the provided URL.', 'gutenberg' ),
				array( 'status' => 400 )
			);
		}

		/*
		 * Only download URLs whose extension maps to an allowed image MIME type.
		 * The sideload handler would reject other types anyway (via
		 * wp_check_filetype_and_ext()), but checking first avoids downloading
		 * files that can never be accepted, such as PHP scripts.
		 */
		$filetype = wp_check_filetype( $filename );
		if ( ! $filetype['type'] || ! str_starts_with( $filetype['type'], 'image/' ) ) {
			return new WP_Error(
				'rest_invalid_url',
				__( 'The provided URL does not point to a supported image file.', 'gutenberg' ),
				array( 'status' => 400 )
			);
		}

		/*
		 * Download the remote file with WordPress's HTTP API, which validates
		 * the host and blocks requests to private or local addresses. This is
		 * the same primitive core's media_sideload_image() relies on.
		 */
		$tmp_file = download_url( $url );
		if ( is_wp_error( $tmp_file ) ) {
			return $tmp_file;
		}

		$file_array = array(
			'name'     => $filename,
			'tmp_name' => $tmp_file,
		);

		$attachment_id = media_handle_sideload( $file_array, $post_id );

		if ( is_wp_error( $attachment_id ) ) {
			/*
			 * media_handle_sideload() deletes the temp file on success; remove
			 * it explicitly when the sideload fails.
			 */
			if ( file_exists( $tmp_file ) ) {
				wp_delete_file( $tmp_file );
			}
			return $attachment_id;
		}

		$attachment = get_post( $attachment_id );

		$request->set_param( 'context', 'edit' );

		/*
		 * media_handle_sideload() fires the standard insert hooks (including
		 * wp_after_insert_post), but not the REST-specific action, so fire it
		 * here for parity with the uploaded-file path in create_item().
		 */
		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php */
		do_action( 'rest_after_insert_attachment', $attachment, $request, true );

		$response = $this->prepare_item_for_response( $attachment, $request );
		$response->set_status( 201 );
		$response->header( 'Location', rest_url( rest_get_route_for_post( $attachment_id ) ) );

		return $response;
	}

	/**
	 * Finalizes an attachment after client-side media processing.
	 *
	 * Triggers the {@see 'wp_generate_attachment_metadata'} filter so that
	 * server-side plugins can process the attachment after all client-side
	 * operations (upload, thumbnail generation, sideloads) are complete.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
	 */
	public function finalize_item( WP_REST_Request $request ) {
		$attachment_id = $request['id'];

		$post = $this->get_post( $attachment_id );

		if ( is_wp_error( $post ) ) {
			return $post;
		}

		$metadata = wp_get_attachment_metadata( $attachment_id );

		if ( ! is_array( $metadata ) ) {
			$metadata = array();
		}

		// Apply all sub-size metadata collected from sideload responses.
		$sub_sizes = $request['sub_sizes'] ?? array();

		foreach ( $sub_sizes as $sub_size ) {
			$image_size = $sub_size['image_size'];

			// When multiple size names share identical dimensions the client
			// sends a single sub-size entry with an array of names. Register the
			// same file under each name. Arrays only contain regular sizes.
			if ( is_array( $image_size ) ) {
				$metadata['sizes'] = $metadata['sizes'] ?? array();

				foreach ( $image_size as $name ) {
					$metadata['sizes'][ $name ] = array(
						'width'     => $sub_size['width'] ?? 0,
						'height'    => $sub_size['height'] ?? 0,
						'file'      => $sub_size['file'] ?? '',
						'mime-type' => $sub_size['mime_type'] ?? '',
						'filesize'  => $sub_size['filesize'] ?? 0,
					);
				}
				continue;
			}

			if ( 'original' === $image_size || 'scaled' === $image_size ) {
				// Skip malformed entries so a bad payload cannot blank out the
				// main file metadata.
				if ( empty( $sub_size['file'] ) ) {
					continue;
				}

				// Record the supplied full-size image (from sideload_item()) as
				// the main file, keeping the current attached file as
				// `original_image`. A 'scaled' image is downsized and an
				// 'original' image is rotated; both have any EXIF orientation
				// already applied by the client.
				if ( ! empty( $sub_size['original_image'] ) ) {
					$metadata['original_image'] = $sub_size['original_image'];
				}
				$metadata['width']    = $sub_size['width'] ?? 0;
				$metadata['height']   = $sub_size['height'] ?? 0;
				$metadata['filesize'] = $sub_size['filesize'] ?? 0;
				$metadata['file']     = $sub_size['file'];

				// The supplied image has its orientation applied already, so
				// reset the stored value (from the upload) to 1, as
				// wp_create_image_subsizes() does for both its scale and rotate
				// paths. Otherwise exif_orientation would still report the
				// pre-rotation value and the client would rotate the image
				// again on a re-fetch.
				if ( ! empty( $metadata['image_meta']['orientation'] ) ) {
					$metadata['image_meta']['orientation'] = 1;
				}
			} elseif ( self::IMAGE_SIZE_SOURCE_ORIGINAL === $image_size ) {
				// Source-format original: stored under its own meta key so the
				// scaled-sideload flow (which writes 'original_image') cannot
				// clobber it. 'original_image' keeps pointing at the
				// web-viewable JPEG derivative. Cleanup on attachment delete
				// is handled by a delete_attachment hook that reads this key.
				$metadata[ self::META_KEY_SOURCE_IMAGE ] = $sub_size['file'];
			} elseif ( self::IMAGE_SIZE_ANIMATED_VIDEO === $image_size ) {
				// Converted video companion of an animated GIF. Stored
				// under its own key; the GIF stays the attachment. The
				// editor reads this key to switch the block to a video;
				// companion cleanup lives in lib/media/animated-gif-to-video.php.
				$metadata[ self::META_KEY_ANIMATED_VIDEO ] = $sub_size['file'];
			} elseif ( self::IMAGE_SIZE_ANIMATED_VIDEO_POSTER === $image_size ) {
				// Static first-frame poster for the converted video. Used as
				// the video block's poster and deleted alongside the video.
				// See lib/media/animated-gif-to-video.php.
				$metadata[ self::META_KEY_ANIMATED_VIDEO_POSTER ] = $sub_size['file'];
			} else {
				$metadata['sizes'] = $metadata['sizes'] ?? array();

				$metadata['sizes'][ $image_size ] = array(
					'width'     => $sub_size['width'] ?? 0,
					'height'    => $sub_size['height'] ?? 0,
					'file'      => $sub_size['file'] ?? '',
					'mime-type' => $sub_size['mime_type'] ?? '',
					'filesize'  => $sub_size['filesize'] ?? 0,
				);
			}
		}

		/**
		 * Filters the attachment metadata after client-side processing.
		 *
		 * This re-applies the wp_generate_attachment_metadata filter so that
		 * server-side plugins (e.g. those adding custom image sizes or
		 * processing metadata) can run after client-side uploads are complete.
		 *
		 * @param array  $metadata      Attachment metadata.
		 * @param int    $attachment_id Attachment ID.
		 * @param string $context       Context: 'create' or 'update'.
		 */
		// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
		$metadata = apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'update' );

		wp_update_attachment_metadata( $attachment_id, $metadata );

		$response_request = new WP_REST_Request(
			WP_REST_Server::READABLE,
			rest_get_route_for_post( $attachment_id )
		);

		$response_request['context'] = 'edit';

		if ( isset( $request['_fields'] ) ) {
			$response_request['_fields'] = $request['_fields'];
		}

		return $this->prepare_item_for_response( get_post( $attachment_id ), $response_request );
	}

	/**
	 * Checks if a given request has access to sideload a file.
	 *
	 * Sideloading a file for an existing attachment
	 * requires both update and create permissions.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has access to update the item, WP_Error object otherwise.
	 */
	public function sideload_item_permissions_check( $request ) {
		return $this->edit_media_item_permissions_check( $request );
	}

	/**
	 * Filters {@see 'wp_unique_filename'} during sideloads.
	 *
	 * {@see wp_unique_filename()} will always add numeric suffix if the name looks like a sub-size to avoid conflicts.
	 *
	 * Adding this closure to the filter helps work around this safeguard.
	 *
	 * Example: when uploading myphoto.jpeg, WordPress normally creates myphoto-150x150.jpeg,
	 * and when uploading myphoto-150x150.jpeg, it will be renamed to myphoto-150x150-1.jpeg
	 * However, here it is desired not to add the suffix in order to maintain the same
	 * naming convention as if the file was uploaded regularly.
	 *
	 * @link https://github.com/WordPress/wordpress-develop/blob/30954f7ac0840cfdad464928021d7f380940c347/src/wp-includes/functions.php#L2576-L2582
	 *
	 * @param string     $filename            Unique file name.
	 * @param string     $dir                 Directory path.
	 * @param int|string $number              The highest number that was used to make the file name unique
	 *                                        or an empty string if unused.
	 * @param string     $attachment_filename Original attachment file name.
	 * @return string Filtered file name.
	 */
	private static function filter_wp_unique_filename( $filename, $dir, $number, $attachment_filename ) {
		if ( empty( $number ) || ! $attachment_filename ) {
			return $filename;
		}

		$ext       = pathinfo( $filename, PATHINFO_EXTENSION );
		$name      = pathinfo( $filename, PATHINFO_FILENAME );
		$orig_name = pathinfo( $attachment_filename, PATHINFO_FILENAME );

		if ( ! $ext || ! $name ) {
			return $filename;
		}

		$matches = array();
		if ( preg_match( '/(.*)(-\d+x\d+|-scaled)-' . $number . '$/', $name, $matches ) ) {
			$filename_without_suffix = $matches[1] . $matches[2] . ".$ext";
			if ( $matches[1] === $orig_name ) {
				return $filename_without_suffix;
			}
		}

		return $filename;
	}

	/**
	 * Validates that uploaded image dimensions are appropriate for the specified image size.
	 *
	 * @param int          $width         Uploaded image width.
	 * @param int          $height        Uploaded image height.
	 * @param string|array $image_size    The target image size name, or an array
	 *                                    of names that share the same dimensions.
	 * @param int          $attachment_id The attachment ID.
	 * @return true|WP_Error True if valid, WP_Error if invalid.
	 */
	private function validate_image_dimensions( int $width, int $height, $image_size, int $attachment_id ) {
		// 'animated_video' companion file: video, not an image. Skip *all*
		// dimension checks (the caller passes (0, 0) for this case so the
		// positive-dimension assertion below would otherwise fire).
		if ( self::IMAGE_SIZE_ANIMATED_VIDEO === $image_size ) {
			return true;
		}

		// Source-format original companion file: no dimension constraint, and
		// the caller passes (0, 0) because the source format (e.g. HEIC) may
		// not be readable by wp_getimagesize() at all.
		if ( self::IMAGE_SIZE_SOURCE_ORIGINAL === $image_size ) {
			return true;
		}

		// Dimensions must be positive for all sizes.
		if ( $width <= 0 || $height <= 0 ) {
			return new WP_Error(
				'rest_upload_invalid_dimensions',
				__( 'Uploaded image must have positive dimensions.', 'gutenberg' ),
				array( 'status' => 400 )
			);
		}

		// Arrays only contain regular sub-size names that share dimensions.
		// Validate each one against its registered constraints.
		if ( is_array( $image_size ) ) {
			foreach ( $image_size as $name ) {
				$result = $this->validate_image_dimensions( $width, $height, $name, $attachment_id );
				if ( is_wp_error( $result ) ) {
					return $result;
				}
			}
			return true;
		}

		// 'animated_video_poster' companion: a static poster image for the
		// converted video. It is a real image (so it has positive dimensions)
		// but is not a registered sub-size, so it has no dimension constraint.
		if ( self::IMAGE_SIZE_ANIMATED_VIDEO_POSTER === $image_size ) {
			return true;
		}

		// 'original' size: the full-size image that replaces the main file (see
		// sideload_item()/finalize_item()). The endpoint expects any EXIF
		// orientation to be applied to the image already, which can swap width
		// and height, so the dimensions must match the stored dimensions or be
		// their transpose.
		if ( 'original' === $image_size ) {
			$metadata = wp_get_attachment_metadata( $attachment_id, true );
			if ( is_array( $metadata ) && isset( $metadata['width'], $metadata['height'] ) ) {
				$expected_width  = (int) $metadata['width'];
				$expected_height = (int) $metadata['height'];

				$matches_dimensions    = $width === $expected_width && $height === $expected_height;
				$transposes_dimensions = $width === $expected_height && $height === $expected_width;

				if ( ! $matches_dimensions && ! $transposes_dimensions ) {
					return new WP_Error(
						'rest_upload_dimension_mismatch',
						sprintf(
							/* translators: 1: actual width, 2: actual height, 3: expected width, 4: expected height */
							__( 'Uploaded image dimensions (%1$dx%2$d) do not match original image dimensions (%3$dx%4$d).', 'gutenberg' ),
							$width,
							$height,
							$expected_width,
							$expected_height
						),
						array( 'status' => 400 )
					);
				}
			}
			return true;
		}

		// 'full' size (PDF thumbnails) and 'scaled': no further constraints.
		if ( 'full' === $image_size || 'scaled' === $image_size ) {
			return true;
		}

		// Regular image sizes: validate against registered size constraints.
		$registered_sizes = wp_get_registered_image_subsizes();

		if ( ! isset( $registered_sizes[ $image_size ] ) ) {
			return new WP_Error(
				'rest_upload_unknown_size',
				__( 'Unknown image size.', 'gutenberg' ),
				array( 'status' => 400 )
			);
		}

		$size_data  = $registered_sizes[ $image_size ];
		$max_width  = (int) $size_data['width'];
		$max_height = (int) $size_data['height'];

		// Validate dimensions don't exceed the registered size maximums.
		// Allow 1px tolerance for rounding differences.
		$tolerance = 1;

		if ( $max_width > 0 && $width > $max_width + $tolerance ) {
			return new WP_Error(
				'rest_upload_dimension_mismatch',
				sprintf(
					/* translators: 1: image size name, 2: max width, 3: actual width */
					__( 'Uploaded image width (%3$d) exceeds maximum for "%1$s" size (%2$d).', 'gutenberg' ),
					$image_size,
					$max_width,
					$width
				),
				array( 'status' => 400 )
			);
		}

		if ( $max_height > 0 && $height > $max_height + $tolerance ) {
			return new WP_Error(
				'rest_upload_dimension_mismatch',
				sprintf(
					/* translators: 1: image size name, 2: max height, 3: actual height */
					__( 'Uploaded image height (%3$d) exceeds maximum for "%1$s" size (%2$d).', 'gutenberg' ),
					$image_size,
					$max_height,
					$height
				),
				array( 'status' => 400 )
			);
		}

		return true;
	}

	/**
	 * Side-loads a media file without creating an attachment.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, WP_Error object on failure.
	 */
	public function sideload_item( WP_REST_Request $request ) {
		$attachment_id = $request['id'];

		$post = $this->get_post( $attachment_id );

		if ( is_wp_error( $post ) ) {
			return $post;
		}

		if (
			! wp_attachment_is_image( $post ) &&
			! wp_attachment_is( 'pdf', $post )
		) {
			return new WP_Error(
				'rest_post_invalid_id',
				__( 'Invalid post ID, only images and PDFs can be sideloaded.', 'gutenberg' ),
				array( 'status' => 400 )
			);
		}

		if ( ! $request['convert_format'] ) {
			// Prevent image conversion as that is done client-side.
			add_filter( 'image_editor_output_format', '__return_empty_array', 100 );
		}

		// Get the file via $_FILES or raw data.
		$files   = $request->get_file_params();
		$headers = $request->get_headers();

		/*
		 * wp_unique_filename() will always add numeric suffix if the name looks like a sub-size to avoid conflicts.
		 * See https://github.com/WordPress/wordpress-develop/blob/30954f7ac0840cfdad464928021d7f380940c347/src/wp-includes/functions.php#L2576-L2582
		 * With the following filter we can work around this safeguard.
		 */

		$attachment_filename = get_attached_file( $attachment_id, true );
		$attachment_filename = $attachment_filename ? wp_basename( $attachment_filename ) : null;

		/**
		 * @param string        $filename                 Unique file name.
		 * @param string        $ext                      File extension. Example: ".png".
		 * @param string        $dir                      Directory path.
		 * @param callable|null $unique_filename_callback Callback function that generates the unique file name.
		 * @param string[]      $alt_filenames            Array of alternate file names that were checked for collisions.
		 * @param int|string    $number                   The highest number that was used to make the file name unique
		 *                                                or an empty string if unused.
		 * @return string Filtered file name.
		 */
		$filter_filename = static function ( $filename, $ext, $dir, $unique_filename_callback, $alt_filenames, $number ) use ( $attachment_filename ) {
			return self::filter_wp_unique_filename( $filename, $dir, $number, $attachment_filename );
		};

		add_filter( 'wp_unique_filename', $filter_filename, 10, 6 );

		$parent_post = get_post_parent( $attachment_id );

		$time = null;

		// Matches logic in media_handle_upload().
		// The post date doesn't usually matter for pages, so don't backdate this upload.
		if ( $parent_post && 'page' !== $parent_post->post_type && substr( $parent_post->post_date, 0, 4 ) > 0 ) {
			$time = $parent_post->post_date;
		}

		if ( ! empty( $files ) ) {
			$file = $this->upload_from_file( $files, $headers, $time );
		} else {
			$file = $this->upload_from_data( $request->get_body(), $headers, $time );
		}

		remove_filter( 'wp_unique_filename', $filter_filename );
		remove_filter( 'image_editor_output_format', '__return_empty_array', 100 );

		if ( is_wp_error( $file ) ) {
			return $file;
		}

		$type = $file['type'];
		$path = $file['file'];

		$image_size = $request['image_size'];

		// Read dimensions once up-front. Needed both for early-error handling
		// (corrupted/unsupported files) and for populating the sub-size payload
		// below. 'original' and 'scaled' both replace the main file, so their
		// dimensions are written to metadata; 'original' is additionally
		// validated against the stored attachment size (it must match it or be
		// its transpose).
		//
		// 'animated_video' companions are video files (MP4/WebM); the image
		// helpers can't read their dimensions and would falsely report the
		// upload as "corrupted or unsupported". Source-format originals
		// ('source_original', e.g. the HEIC kept next to its JPEG derivative)
		// are exempt for the same reason: their dimensions are neither
		// validated nor recorded, and wp_getimagesize() may not be able to
		// read the source format at all on servers without HEIC/HEIF support.
		// Skip the read for both cases; validate_image_dimensions() also
		// short-circuits them below.
		$skip_dimension_read =
			self::IMAGE_SIZE_ANIMATED_VIDEO === $image_size ||
			self::IMAGE_SIZE_SOURCE_ORIGINAL === $image_size;

		$size = $skip_dimension_read ? array( 0, 0 ) : wp_getimagesize( $path );

		if ( ! $size ) {
			// Could not determine dimensions (corrupted file, unsupported format).
			wp_delete_file( $path );
			return new WP_Error(
				'rest_upload_invalid_image',
				__( 'Could not read image dimensions. The file may be corrupted or an unsupported format.', 'gutenberg' ),
				array( 'status' => 400 )
			);
		}

		$validation = $this->validate_image_dimensions( $size[0], $size[1], $image_size, $attachment_id );
		if ( is_wp_error( $validation ) ) {
			// Clean up the uploaded file.
			wp_delete_file( $path );
			return $validation;
		}

		// Build sub-size data to return to the client.
		// The client accumulates these and sends them all to the finalize endpoint.
		// `image_size` may be a single string or an array of names that share the
		// same dimensions and therefore reuse a single sideloaded file. Arrays
		// only carry regular sub-sizes; the special keys below ('original',
		// 'scaled', and the source-format original) are always scalar strings.
		$sub_size_data = array(
			'image_size' => $image_size,
		);

		if ( is_array( $image_size ) ) {
			$sub_size_data['width']     = $size[0];
			$sub_size_data['height']    = $size[1];
			$sub_size_data['file']      = wp_basename( $path );
			$sub_size_data['mime_type'] = $type;
			$sub_size_data['filesize']  = wp_filesize( $path );
		} elseif ( self::IMAGE_SIZE_SOURCE_ORIGINAL === $image_size ) {
			// Source-format original. finalize_item() writes the filename to
			// $metadata[ self::META_KEY_SOURCE_IMAGE ] (separate from
			// 'original_image', which the scaled-sideload flow owns). Cleanup on
			// attachment delete is handled by a delete_attachment hook that reads
			// this key.
			$sub_size_data['file'] = wp_basename( $path );
		} elseif ( self::IMAGE_SIZE_ANIMATED_VIDEO === $image_size ) {
			// Converted animated-GIF video companion. finalize_item()
			// writes the filename to $metadata['animated_video']; the editor
			// reads it to switch the block to a video, and a delete_attachment
			// hook removes it. See lib/media/animated-gif-to-video.php.
			$sub_size_data['file'] = wp_basename( $path );
		} elseif ( self::IMAGE_SIZE_ANIMATED_VIDEO_POSTER === $image_size ) {
			// Static poster for the converted video. finalize_item() writes
			// the filename to $metadata['animated_video_poster']; used as the
			// video block's poster and deleted with the video.
			$sub_size_data['file'] = wp_basename( $path );
		} elseif ( 'scaled' === $image_size || 'original' === $image_size ) {
			// 'scaled' and 'original' both replace the attachment's main file
			// with the supplied image and keep the file being replaced as
			// `original_image`, which is the untouched upload. A 'scaled' image is
			// downsized and an 'original' image has any EXIF orientation already
			// applied. This is the same swap WordPress makes when it scales or
			// rotates an image on upload. See core's _wp_image_meta_replace_original().
			$current_file = get_attached_file( $attachment_id, true );

			if ( ! $current_file ) {
				return new WP_Error(
					'rest_sideload_no_attached_file',
					__( 'Unable to retrieve the attached file for this attachment.', 'gutenberg' ),
					array( 'status' => 404 )
				);
			}

			$sub_size_data['original_image'] = wp_basename( $current_file );

			// Update the attached file to point to the supplied image.
			// This writes to _wp_attached_file meta, not _wp_attachment_metadata.
			// Guard against a failed update so a stale original is not recorded.
			if (
				get_attached_file( $attachment_id, true ) !== $path &&
				! update_attached_file( $attachment_id, $path )
			) {
				return new WP_Error(
					'rest_sideload_update_attached_file_failed',
					__( 'Unable to update the attached file for this attachment.', 'gutenberg' ),
					array( 'status' => 500 )
				);
			}

			$sub_size_data['width']    = $size[0];
			$sub_size_data['height']   = $size[1];
			$sub_size_data['filesize'] = wp_filesize( $path );
			$sub_size_data['file']     = _wp_relative_upload_path( $path );
		} else {
			$sub_size_data['width']     = $size[0];
			$sub_size_data['height']    = $size[1];
			$sub_size_data['file']      = wp_basename( $path );
			$sub_size_data['mime_type'] = $type;
			$sub_size_data['filesize']  = wp_filesize( $path );
		}

		return rest_ensure_response( $sub_size_data );
	}

	/**
	 * Resolves the encode quality WordPress would use for an image.
	 *
	 * Prefers the core wp_get_image_encode_quality() helper when available, and
	 * otherwise mirrors WP_Image_Editor::set_quality() inline for WordPress
	 * versions that predate it: per-format default, the wp_editor_set_quality
	 * filter, the jpeg_quality filter for JPEG output, then resets non-numeric
	 * or out-of-range values to the default and squashes 0 to 1.
	 *
	 * wp_get_image_encode_quality() is proposed for WordPress core in
	 * https://github.com/WordPress/wordpress-develop/pull/11856; until it lands
	 * the function_exists() guard falls back to the inline implementation below.
	 *
	 * @param non-empty-string $mime_type The output image MIME type, e.g. 'image/jpeg'.
	 * @param array{ width?: non-negative-int, height?: non-negative-int } $size Dimensions ('width', 'height') for the wp_editor_set_quality filter.
	 * @return int<1, 100> Encode quality between 1 and 100.
	 */
	private function get_image_encode_quality( string $mime_type, array $size = array() ): int {
		if ( function_exists( 'wp_get_image_encode_quality' ) ) {
			return wp_get_image_encode_quality( $mime_type, $size );
		}

		// Mirror WP_Image_Editor::get_default_quality(): WebP defaults to 86,
		// everything else to 82.
		$default_quality = ( 'image/webp' === $mime_type ) ? 86 : 82;

		/** This filter is documented in wp-includes/class-wp-image-editor.php */
		$quality = apply_filters(
			'wp_editor_set_quality', // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
			$default_quality,
			$mime_type,
			$size
		);

		if ( 'image/jpeg' === $mime_type ) {
			/** This filter is documented in wp-includes/class-wp-image-editor.php */
			$quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound
		}

		if ( ! is_numeric( $quality ) ) {
			$quality = $default_quality;
		} else {
			$quality = (int) $quality;
		}

		// Reset out-of-range values to the default, matching WP_Image_Editor::set_quality().
		if ( $quality < 0 || $quality > 100 ) {
			$quality = $default_quality;
		}

		// Allow 0, but squash to 1, matching WP_Image_Editor::set_quality().
		if ( 0 === $quality ) {
			$quality = 1;
		}

		return $quality;
	}
}

```