NGINX Rewrite rules for WordPress Multisite in a subfolder - wordpress

Question

I have a unique setup with a WordPress install in the main root and a second WordPress install (multisite) in a sub folder.
/sites/example.com/files/[WP Site example.com]
/sites/example.com/files/demo [WP Multisite example.com/demo]
The main site is working well but the multisite isn't.
When I request a multisite (example.com/demo/site1) it I get 404's in the console (example.com/demo/site1/style.css = 404)
Here is my conf.
map $uri $blogname{
~^(?P<blogpath>/[^/]+/)files/(.*) $blogpath ;
}
map $blogname $blogid{
default -999;
}
server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name example.com;
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
root /sites/example.com/files/;
index index.html index.php;
access_log /sites/example.com/logs/access.log;
error_log /sites/example.com/logs/error.log;
# MIME sniffing prevention
add_header X-Content-Type-Options "nosniff";
# Enable cross-site scripting filter in supported browsers.
add_header X-Xss-Protection "1; mode=block";
# WP Multisite start
location ~ ^(/[^/]+)?/files/(.+) {
try_files /wp-content/blogs.dir/$blogid/files/$2 /wp-includes/ms-files.php?file=$2 ;
access_log off; log_not_found off; expires max;
}
#avoid php readfile()
location ^~ /blogs.dir {
internal;
alias /sites/example.com/files/demo/wp-content/blogs.dir ;
access_log off; log_not_found off; expires max;
}
if (!-e $request_filename) {
rewrite /wp-admin$ $scheme://$host$uri/ permanent;
rewrite ^(/[^/]+)?(/wp-.*) $2 last;
rewrite ^(/[^/]+)?(/.*\.php) $2 last;
}
location /demo {
#alias /sites/example.com/files/demo/;
try_files $uri $uri/ /demo/index.php?$args;
}
# WP Multisite end
# Prevent access to hidden files
location ~* /\.(?!well-known\/) {
deny all;
}
# Prevent access to certain file extensions
location ~\.(ini|log|conf|blade.php)$ {
deny all;
}
location / {
try_files $uri $uri/ /index.php?$args;
}
location ~ \.php$ {
try_files $uri =404;
include fastcgi.conf;
fastcgi_pass unix:/run/php/php8.0-example.sock;
}
}
Any advice would be greatly appreciated. I've been trying to solve this for about a week.
I've been using this as a guide:
https://www.nginx.com/resources/wiki/start/topics/recipes/wordpress/#rewrite-rules-for-multisite
Thank you!

Answer 1

I commented above and left the link that was helpful in answering my question.
Here is my final nginx config that is working.
map $uri $blogname{
~^(?P<blogpath>/[^/]+/)files/(.*) $blogpath ;
}
map $blogname $blogid{
default -999;
#Ref: http://wordpress.org/extend/plugins/nginx-helper/
#include /var/www/wordpress/wp-content/plugins/nginx-helper/map.conf ;
}
server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name example.com;
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
root /sites/example.com/files/;
index index.html index.php;
access_log /sites/example.com/logs/access.log;
error_log /sites/example.com/logs/error.log;
# MIME sniffing prevention
add_header X-Content-Type-Options "nosniff";
# Enable cross-site scripting filter in supported browsers.
add_header X-Xss-Protection "1; mode=block";
# WP Multisite start
location ~ ^(/[^/]+)?/files/(.+) {
try_files /wp-content/blogs.dir/$blogid/files/$2 /wp-includes/ms-files.php?file=$2 ;
access_log off; log_not_found off; expires max;
}
#avoid php readfile()
location ^~ /blogs.dir {
internal;
alias /sites/example.com/files/demo/wp-content/blogs.dir ;
access_log off; log_not_found off; expires max;
}
# Rewrite multisite '.../wp-.*' and '.../*.php'.
if (!-e $request_filename) {
rewrite /wp-admin$ $scheme://$host$uri/ permanent;
rewrite ^/demo(/[^/]+)?(/wp-.*) /demo$2 last;
rewrite ^/demo(/[^/]+)?(/.*\.php)$ /demo$2 last;
}
location /demo {
#alias /sites/example.com/files/demo/;
try_files $uri $uri/ /demo/index.php?$args;
}
# WP Multisite end
# Prevent access to hidden files
location ~* /\.(?!well-known\/) {
deny all;
}
# Prevent access to certain file extensions
location ~\.(ini|log|conf|blade.php)$ {
deny all;
}
location / {
try_files $uri $uri/ /index.php?$args;
}
location ~ \.php$ {
try_files $uri =404;
include fastcgi.conf;
fastcgi_pass unix:/run/php/php8.0-example.sock;
}
}