rewrite hostname in sub_filter!

[shahzaib mushtaq]

Hi,

We've running nginx as reverse proxy for backend domain named "mydomain.com".
On proxy server we've setup vhost that covers domain and all subdomains *.
mydomain.com.

What we need is that if user request to any subdomain like work.mydomain.com,
he should be proxied to single backend mydomain.com but all underline links
e.g css/js should be changed to *work-mydomain-com.newdomain.com
<http://work-mydomain-com.newdomain.com>* . If second user requests
nginx.mydomain.com, he should be proxied back to single backend *mydomain.com
<http://mydomain.com>* while underline links css/js should be changed
to *nginx-mydomain-com.newdomain.com
<http://nginx-mydomain-com.newdomain.com>.*

As you can see we want all dots in domain/subdomain to be changed to hyphen
(-).

I am able to change css/js links using sub_filter to
work.mydomain.com.newdomain.com by making use of $host param but i am
struggling on changing it to hyphens.

Please check this nginx config and advise on how to change hostname from
dots to hyphen in sub_filter e.g:

mydomain.com ==> mydomain-com.newdomain.com
work.mydomain.com ==> work-mydomain-com.newdomain.com
nginx.mydomain.com ==> nginx-mydomain-com.newdomain.com

====================================================

upstream server {
        server 10.10.10.10:443;

}
server {
    listen      80;
    listen 443 ssl http2;
    ssl_certificate /etc/ssl/certs/mydomain/mydomain.crt;
    ssl_certificate_key /etc/ssl/certs/mydomain/privkey1.pem;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers
'ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4';
    ssl_prefer_server_ciphers on;
    server_name mydomain.com *.mydomain.com;



    location / {

        proxy_set_header Accept-Encoding "";
        #subs_filter_types text/css text/xml text/css;
        sub_filter "https://mydomain.com" "https://$host.newdomain.com";

        sub_filter_once off;
        proxy_pass https://server;
        proxy_set_header HOST mydomain.com;
    }
}
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