msm-sitemap-private-blog-render.php

<?php
/**
 * Enable msm-sitemap plugin sitemap rendering on non-production environments
 * by overriding blog_public to 1 on the pre_option hook.
 *
 * @param mixed $pre_option Value of an existing option.
 *
 * @return mixed
 */
function vip_enable_non_prod_sitemap_rendering( $pre_option ) {
	// Return early and leave blog_public option as is on production.
	if ( defined( 'VIP_GO_APP_ENVIRONMENT' ) && 'production' === VIP_GO_APP_ENVIRONMENT ) {
		return $pre_option;
	}

	// Support both /sitemap.xml and /sitemap.xml?yyyy=2024&mm=10&dd=14 type variations.
	$request_uri = strval( filter_var( $_SERVER['REQUEST_URI'] ?? '', FILTER_SANITIZE_URL ) );
	$parsed_url  = parse_url( $request_uri );

	// Check if the path is `/sitemap.xml` and make blog_public option true.
	if ( isset( $parsed_url['path'] ) && $parsed_url['path'] === '/sitemap.xml' ) {
		return 1;
	}

	// Fallback to return default value.
	return $pre_option;
}

add_filter( 'pre_option_blog_public', 'vip_enable_non_prod_sitemap_rendering' );