.htaccess for domain change with subdomains - apache + plesk - apache

Question

We're using a plesk based system and just recently changed domain names. I'd like to redirect all requests coming in to the old domain to the new. There are many question asked in a similar fashion but mine is a bit different. I'd like to ensure that all subdomains get routed to the same subdoamin on the new domain. I set up a generic htaccess in the docroot but for some reason it is also applying to all subdomains.
RewriteCond %{HTTP_HOST} !newdomain.com$ [NC]
RewriteRule ^(.*)$ http://newdomain.com/$1 [L,R=301]
How can I make this more general so that subdomains also appropriately get routed? For bonus points, how can I route https requests to https and http to http.
I'd like to add that the rule transforms the first url to the second which is not desirable:
http://SUBDOMAIN.olddomain.com/somepath/somefile.php
http://newdomain.com/subdomains/SUBDOMAIN/httpdocs/somepath/somefile.php
The proper transform should create the following url:
http://SUBDOMAIN.newdomain.com/somepath/somefile.php
Lastly, this should work with wildcard subdomains.
Thanks in advanced!

Answer 1

Try:
# ignore "www."
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteCond %{HTTP_HOST} ^([^.]+)\.olddomain.com$ [NC]
RewriteRule ^(.*)$ http://%1.newdomain.com/$1 [L,R=301]
You'd want this before the rule that you already have.
And since you've edited your question, you want an additional internal rewrite for handling subdomains in general on your new site, this has nothing to do with the redirect. This is brand new functionality that is outside of the scope of a 301 redirect. You're going to need special rules to handle internal routing of subdomains:
RewriteCond %{REQUEST_URI} !^/subdomains/
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteCond %{HTTP_HOST} ^([^.]+)\.newdomain.com$ [NC]
RewriteRule ^(.*)$ /subdomains/%1/httpdocs/$1 [L]