Logic block in Grails URLMappings - grails

Question

My site has urls like 'http://someRandomUsername.mysite.com'.
Sometimes users will try urls like
'http://www.someRandomeUsername.mysite.com'. I'd like to have some
logic in my url mappings to deal with this.
With the mappings below when I hit the page , with or without the
unneeded www, I get:
2012-03-01 14:52:16,014 [http-8080-5] ERROR [localhost].[/ambit] -
Unhandled exception occurred whilst decorating page
java.lang.IllegalArgumentException: URL mapping must either provide a
controller or view name to map to!
Any idea how to accomplish this? The mapping is below.
Thanks!
Jason
static mappings = {
name publicMap: "/$action?/$id?" {
def ret = UrlMappings.check(request)
controller = ret.controller
userName = ret.userName
}
}
static check =
{ request ->
def tokens = request?.serverName?.split(/\./) as List ?: []
def ret = [controller:'info']
if(tokens.size() > 3 && token[0] == 'www')
{
ret.userName = tokens[1]
ret.controller = 'redirect'
ret.action = 'removeWWW'
}
else if(tokens.size() == 3)
{
ret.userName = tokens[0]
ret.controller = 'info'
}
return ret
}

Answer 1

Honestly, like DmitryB said, the best way to do this is via the web server, whether it's IIS, Apache, or Tomcat.
Having said that, I feel the best way to accomplish this in Grails would be using filters.
You could create something like this in your ~/conf directory:
public class StripFilters {
def filters = {
stripWWWFilter(controller: '*', action: '*') {
before = {
def tokens = request.serverName.tokenize(/\./) ?: []
if(tokens.size() > 3 && tokens[0] == 'www') {
def url = request.request.requestURL.toString().replace('www.', '')
redirect([url:url, params: [userName: tokens[1]], permanent: true])
return false
}
}
}
}
}
This should do the trick.