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Wordpress Reverse Proxy Plugin
<?php
/**
* @package Reverse Proxy
*/
/*
Plugin Name: Reverse Proxy
Plugin URI: https://instrumentalapp.com/
Description: Reverse proxy setup for Instrumental blog
Version: 1.0
Author: James Paden
Author URI: https://instrumentalapp.com
*/
// Change to match the desired subfolder, no leading or tralling slash
define("RP_SUBFOLDER", "blog");
function rp_is_login_page() {
return in_array($GLOBALS['pagenow'], array('wp-login.php', 'wp-register.php'));
}
if ( $_SERVER["REMOTE_ADDR"] != "127.0.0.1" && !is_admin() && !rp_is_login_page() && $_GET["preview"] != "true" ) {
add_action( 'init', function () {
if (!$_SERVER["HTTP_X_IS_REVERSE_PROXY"]) {
//not coming from us, 404 it.
header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
exit;
}
});
//From http://stackoverflow.com/questions/772510/wordpress-filter-to-modify-final-html-output
ob_start();
add_action('shutdown', function() {
$final = '';
$levels = count(ob_get_level());
for ( $i = 0; $i < $levels; $i++ ) {
$final .= ob_get_clean();
}
// Apply any filters to the final output
$final = str_replace("http://" . $_SERVER["HTTP_HOST"], "https://" . $_SERVER["HTTP_X_ORIGINAL_HOST"] . "/" . RP_SUBFOLDER, $final);
echo $final;
}, 0);
}
//This would only be needed if you are using Yoast SEO
add_filter( 'wpseo_canonical', 'lc_persistent_canonical' );
/**
* Make this a universal change since we want this applied everywhere
* even if we aren't viewing view Reverse Proxy.
*
* Replace the "final_url" with the correct Final URL for the site
*
* @param $canonical string
*/
function lc_persistent_canonical( $canonical ) {
$canonical = str_replace( site_url(), RP_FINAL_URL . RP_SUBFOLDER . '/', $canonical );
return $canonical;
}
# Example code for Apache config
# Put this inside the <VirtualHost> directive
<Location /blog>
RequestHeader set X-Is-Reverse=Proxy true
RequestHeader set X-Original-Host yourwebsite.com
ProxyPass http://yourpressableblog.com
ProxyPassReverse http://yourpressableblog.com
</Location>
# Example code for Nginx config
# Put this inside the "server {" section
location /blog/ {
proxy_set_header X-Original-Host $host;
proxy_set_header X-Is-Reverse-Proxy "true";
proxy_pass_header Set-Cookie;
proxy_cookie_path / /blog/;
proxy_pass http://yourpressableblog.com/;
}
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