class Middleman::Sitemap::ProxyResource

def content_type
  mime_type = super
  return mime_type if mime_type
  target_resource.content_type
end

def initialize(store, path, target)
  super(store, path)
  target = ::Middleman::Util.normalize_path(target)
  raise "You can't proxy #{path} to itself!" if target == path
  @target = target
end

def source_file
  target_resource.source_file
end

def target_resource
  resource = @store.find_resource_by_path(@target)
  unless resource
    raise "Path #{path} proxies to unknown file #{@target}:#{@store.resources.map(&:path)}"
  end
  if resource.is_a? ProxyResource
    raise "You can't proxy #{path} to #{@target} which is itself a proxy."
  end
  resource
end