Imports cloud.google.com/go/pubsub cloud.google.com/go/storage github.com/GoogleCloudPlatform/golang-samples/getting-started/bookshelf github.com/gofrs/uuid github.com/gorilla/handlers github.com/gorilla/mux golang.org/x/oauth2 google.golang.org/api/plus/v1 Standard library imports context encoding/gob encoding/json errors fmt html/template io io/ioutil log net/http net/url os path path/filepath strconv