token_request method in oauth gem

gistfile1.txt

# in ~/.gem/ruby/1.8/gems/oauth-0.4.4/lib/oauth/consumer.rb:196
def token_request(http_method, path, token = nil, request_options = {}, *arguments)
  response = request(http_method, path, token, request_options, *arguments)
  case response.code.to_i

  when (200..299)
    if block_given?
      yield response.body
    else
      # symbolize keys
      # TODO this could be considered unexpected behavior; symbols or not?
      # TODO this also drops subsequent values from multi-valued keys
      CGI.parse(response.body).inject({}) do |h,(k,v)|
        h[k.strip.to_sym] = v.first
        h[k.strip]        = v.first
        h
      end
    end
  when (300..399)
    # this is a redirect
    response.error!
  when (400..499)
    raise OAuth::Unauthorized, response
  else
    response.error!
  end
end