module Excon

def stub(request_params, response_params = nil)
  if url = request_params.delete(:url)
    uri = URI.parse(url)
    request_params.update(
      :host              => uri.host,
      :path              => uri.path,
      :port              => uri.port.to_s,
      :query             => uri.query,
      :scheme            => uri.scheme
    )
    if uri.user || uri.password
      request_params[:headers] ||= {}
      request_params[:headers]['Authorization'] ||= 'Basic ' << ['' << uri.user.to_s << ':' << uri.password.to_s].pack('m').delete(Excon::CR_NL)
    end
  end
  if block_given?
    if response_params
      raise(ArgumentError.new("stub requires either response_params OR a block"))
    else
      stub = [request_params, Proc.new]
    end
  elsif response_params
    stub = [request_params, response_params]
  else
    raise(ArgumentError.new("stub requires either response_params OR a block"))
  end
  stubs.unshift(stub)
  stub
end