Change Image Block Attributes with Default Overrides

change-image-block-attributes-block-editor.php

<?php
/**
 * Plugin Name:       DLX Change Image Attributes
 * Plugin URI:        https://dlxplugins.com
 * Description:       Change the align and default link settings for an image.
 * Version:           1.0.0
 * Requires at least: 6.0
 * Requires PHP:      7.3
 * Author:            Ronald Huereca
 * Author URI:        https://mediaron.com
 * License:           GPL v2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 *
 * @package DLXChangeImageAttributes
 */

namespace DLXPlugins\DLXChangeImageAttributes;

add_filter( 'block_type_metadata', __NAMESPACE__ . '\modify_image_attributes', 10, 1 );

/**
 * Set Image Block defaults.
 *
 * @param array $metadata {
 *    An array of arguments.
 *
 *    @type string $name       Block name.
 *    @type array  $attributes Block attributes.
 * }
 */
function modify_image_attributes( $metadata ) {
	// Check the block type.
	if ( 'core/image' !== $metadata['name'] ) {
		return $metadata;
	}

	$metadata['attributes']['align']['default']           = 'center';
	$metadata['attributes']['linkDestination']['default'] = 'media';

	// Return the metadata.
	return $metadata;
}