class ActionDispatch::RemoteIp

def call(env)
  env["action_dispatch.remote_ip"] = RemoteIpGetter.new(env, @check_ip_spoofing, @trusted_proxies)
  @app.call(env)
end

def initialize(app, check_ip_spoofing = true, trusted_proxies = nil)
  @app = app
  @check_ip_spoofing = check_ip_spoofing
  regex = '(^127\.0\.0\.1$|^(10|172\.(1[6-9]|2[0-9]|30|31)|192\.168)\.)'
  regex << "|(#{trusted_proxies})" if trusted_proxies
  @trusted_proxies = Regexp.new(regex, "i")
end