module Proximity

# File lib/proximity.rb, line 12
def self.included(base)
  base.extend ClassMethods
end

# File lib/proximity.rb, line 22
def call(env)
  route_env(env)
  super
rescue RoutingError => e
  headers = {'Content-Type' => 'text/plain', 'Content-Length' => e.message.length}
  [404, headers, [e.message]]
end

# File lib/proximity.rb, line 43
def route(env)
  match = router.match(env)

  if match
    uri = URI.parse(match.target)
    [uri.host, uri.path]
  else
    raise RoutingError.new("The path: #{env['PATH_INFO']} does not match any proxy routes.")
  end
end

# File lib/proximity.rb, line 30
def route_env(env)
  host, path = route(env)
  env.tap { |e|
    e['SCRIPT_NAME']  = ''
    e['HTTP_HOST']    = host
    e['PATH_INFO']    = path
  }
end

# File lib/proximity.rb, line 39
def router
  self.class.routes.router
end