Imports golang.org/x/oauth2 github.com/gorilla/sessions gopkg.in/yaml.v2 github.com/lestrrat/go-server-starter/listener github.com/sirupsen/logrus Standard library imports context crypto/rand encoding/base64 encoding/gob encoding/json errors flag fmt io/ioutil math/rand net net/http net/url os os/signal strconv syscall time