proxy-aware-https-fix/proxy-aware-https-fix.php at main · bitcryptic-gw/proxy-aware-https-fix · GitHub

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<?php
/**
 * Plugin Name: Proxy-Aware HTTPS Fix
 * Description: Enforces HTTPS detection and correct REST API resolution behind reverse proxies.
 * Version: 1.4.1
 * Author: BitCryptic
 *
 * @package Proxy_Aware_Https_Fix
 */

if ( defined( 'WP_CLI' ) && WP_CLI ) {
	return;
}

add_action(
	'plugins_loaded',
	function () {
		$proto = isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] )
		? sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) )
		: '';

		if (
		( ! isset( $_SERVER['HTTPS'] ) || 'on' !== $_SERVER['HTTPS'] ) &&
		'https' === $proto
		) {
			$_SERVER['HTTPS'] = 'on';
		}
	}
);

add_filter(
	'home_url',
	function ( $url ) {
		if ( ! empty( $_SERVER['HTTPS'] ) && 'on' === $_SERVER['HTTPS'] ) {
			return str_starts_with( $url, 'http:' ) ? 'https:' . substr( $url, 5 ) : $url;
		}
		return $url;
	}
);

add_filter(
	'site_url',
	function ( $url ) {
		if ( ! empty( $_SERVER['HTTPS'] ) && 'on' === $_SERVER['HTTPS'] ) {
			return str_starts_with( $url, 'http:' ) ? 'https:' . substr( $url, 5 ) : $url;
		}
		return $url;
	}
);

add_filter(
	'rank_math/rest_api_url',
	function () {
		return get_site_url( null, '/wp-json/' );
	}
);