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Nginx Replace characters in hostname

I have urls like this:

And I want nginx to replace dots "." characters in the subdomain part of the hostname by dashes "-", so this would result in :

I already have a server block that catches the urls with dots in the "prefix" variable, but I could not find any documentation on how to rewrite url so that is replaces characters in "prefix" without using lua/…:

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name "~^(?<prefix>[w.]+).somedomain.com$";

    rewrite 302 "$scheme://What do i put in here?.somedomain.com$request_uri";
}

A big thanks for people that will try to help on this!

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2

Answers


  1. 0

    You could capture both sides of the . with separate captures, for example:

    server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name ~^([^.]+).([^.]+).([^.]+).example.com$;

    ...

    return 302 $scheme://$1-$2-$3.example.com$request_uri;
}
server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name ~^([^.]+).([^.]+).example.com$;

    ...

    return 302 $scheme://$1-$2.example.com$request_uri;
}
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  2. 0

    Use a map to capture the subdomains:

    map $host $resub {
    ~^([^.]+).([^.]+).somedomain.com$ $1-$2;
    ~^([^.]+).([^.]+).([^.]+).somedomain.com$ $1-$2-$3;
    ~^([^.]+).([^.]+).([^.]+).([^.]+).somedomain.com$ $1-$2-$3-$4;
    ~^([^.]+).([^.]+).([^.]+).([^.]+).([^.]+).somedomain.com$ $1-$2-$3-$4-$5;
    # etc.
}

server {
    server_name  *.somedomain.com;

    if ($resub) {
        return 302 $scheme://$resub.somedomain.com$request_uri;
    }
}
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