server {
    server_name ~^([a\.]+)\.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.ga$;
    root /aaa;

    location ~ / {
        try_files $uri /aaaaa.txt;
    }
}

server {
    server_name ~^(?P<aaaa>.*\.)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.ga$;

    rewrite_by_lua '
        local a, aa, aaa = ngx.re.gsub(ngx.var.aaaa, "[^a\\\\.]", "a", "i")
        return ngx.redirect("http://" .. a .. "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.ga/")
    ';
}

server {
    server_name aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.ga;

    rewrite_by_lua '
        function aa() return string.rep("a", math.random(4, 0x41) - 2) end
        function aaa(a) return ((math.random(0, 0x7f) < 0x41) and (a .. "." .. aa()) or a) end
        return ngx.redirect("http://" .. aaa(aaa(aa())) .. ".aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.ga/")
    ';
}