Rails 4 - Parse URL

Question

I'm parsing a URL in my Rails application. I want to get the domain example.com stripped of any protocol, subdomain, directories, etc.

My method:

def clean_host(url)
  uri = URI.parse(url)
  return uri
end

What I actually get for example.com/ is:

scheme: 
user:
password:
host:
port:
path: example.com/
query:
opaque:
registry:
fragment:
parser:

What I eventually want is to get the domain example.com stripped of any protocol, subdomain, directories, etc.

I've looked into domainatrix but it wont bundle with my project. Is there a way to do this with Ruby's URI.parse? Or will I have to look into other avenues?

Answer 1

The problem is that example.com/ isn't a full URL. URI rightly assumes it's a path. If it were me and you're going to have a lot of these fragments I'd just brute force it.

 > "example.com/".sub(%r{^.*?://}, '').sub(%r{/.*$}, '')
 => "example.com"

> "http://subdomain.example.com/path/here".sub(%r{^.*?://}, '').sub(%r{/.*$}, '')
 => "subdomain.example.com"

Stripping the subdomain off is another ball of wax as you'd need to example the TLD to determine what is appropriate so you don't end up with say "com.uk"

Answer 2

You should just be able to do request.domain assuming you are doing this in a controller.

You can also use request.path and request.subdomain

For example: http://www.domain.com/users/123

request.subdomain => 'www'
request.domain => 'domain.com'
request.path => '/users/123'