Bulk regenerate download permissions

add_action( 'wp_ajax_ccom_regenerate', function() {

	$offset = empty( $_POST['offset'] )
		? 0 : intval( $_POST['offset'] );
	$args = [
		'status' => [ 'wc-completed' ],
		'limit' => 100,
		'offset' => $offset,
		'type' => 'shop_order',
	];
    $orders = wc_get_orders( $args );

	if( ! $orders ) {
		wp_die();
	}

	foreach( $orders as $order ) {
		echo '.';
		if( ! $order->has_downloadable_item() ) {
			continue;
		}
		$data_store = WC_Data_Store::load( 'customer-download' );
		$data_store->delete_by_order_id( $order->get_id() );
		wc_downloadable_product_permissions( $order->get_id(), true );
	}

	wp_die();

} );

add_action( 'admin_notices', function() {

	echo '
		<div class="notice notice-info is-dismissible" id="ccom_regenerate">
			<p>
				<a href="#" id="ccom_regenerate_button">
					Regenerate Download Permissions
				</a>
			</p>
		</div>
	';

} );

add_action( 'admin_enqueue_scripts', function() {

	wp_enqueue_script( 'jquery' );

	wp_add_inline_script( 'jquery', '

		var ccom_regenerate_offset = 0;
		jQuery( document ).ready( function( $ ) {
			$( "#ccom_regenerate_button" ).click( function() {
				ccom_regenerate( $ );
			} );
		} );

		function ccom_regenerate( $ ) {

			var data = {
				"action": "ccom_regenerate",
				"offset": ccom_regenerate_offset
			};
			$.post( ajaxurl, data, function( response ) {

				// Handle EOF Or Error
				if( response == "" ) { return; }

				// Display Page Processed
				$( "div#ccom_regenerate" )
					.append( " [offset:" + ccom_regenerate_offset + "] " );

				// Advance
				ccom_regenerate_offset += 100;
				ccom_regenerate( $ );

			} );

		}

	', 'after' );

} );