WP_REST_Attachments_Controller::prepare_items_query( array $prepared_args = array(), WP_REST_Request $request = null ): array

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protected function prepare_items_query( $prepared_args = array(), $request = null ) {
	$query_args = parent::prepare_items_query( $prepared_args, $request );

	if ( empty( $query_args['post_status'] ) ) {
		$query_args['post_status'] = 'inherit';
	}

	$all_mime_types = array();
	$media_types    = $this->get_media_types();

	if ( ! empty( $request['media_type'] ) && is_array( $request['media_type'] ) ) {
		foreach ( $request['media_type'] as $type ) {
			if ( isset( $media_types[ $type ] ) ) {
				$all_mime_types = array_merge( $all_mime_types, $media_types[ $type ] );
			}
		}
	}

	if ( ! empty( $request['mime_type'] ) && is_array( $request['mime_type'] ) ) {
		foreach ( $request['mime_type'] as $mime_type ) {
			$parts = explode( '/', $mime_type );
			if ( isset( $media_types[ $parts[0] ] ) && in_array( $mime_type, $media_types[ $parts[0] ], true ) ) {
				$all_mime_types[] = $mime_type;
			}
		}
	}

	if ( ! empty( $all_mime_types ) ) {
		$query_args['post_mime_type'] = array_values( array_unique( $all_mime_types ) );
	}

	// Filter query clauses to include filenames.
	if ( isset( $query_args['s'] ) ) {
		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
	}

	return $query_args;
}

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