Uber OAuth2.0 credentials retrieval

ubercreds.go

package main

import (
	"encoding/json"
	"log"
	"os"
	"path/filepath"

	"github.com/orijtech/uber/oauth2"
)

func main() {
	// Make log not print out time info in its prefix.
	log.SetFlags(0)

	uberCredsDirPath := os.ExpandEnv("$HOME/.uber")
	if err := os.MkdirAll(uberCredsDirPath, 0777); err != nil {
		log.Fatal(err)
	}

	scopes := []string{
		oauth2.ScopeProfile, oauth2.ScopeRequest,
		oauth2.ScopeHistory, oauth2.ScopePlaces,
		oauth2.ScopeRequestReceipt,
	}

	token, err := oauth2.AuthorizeByEnvApp(scopes...)
	if err != nil {
		log.Fatal(err)
	}

	blob, err := json.Marshal(token)
	if err != nil {
		log.Fatal(err)
	}

	credsPath := filepath.Join(uberCredsDirPath, "credentials.json")
	f, err := os.Create(credsPath)
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	f.Write(blob)
	log.Printf("Successfully saved your OAuth2.0 token to %q", credsPath)
}