GoogleAPI利用のためにOAuth2.0を使う（Using OAuth 2.0 for Installed Applications） - レベルエンター山本大のブログ問題に直面しているため、 「https://developers.google.com/accounts/docs/OAuth2InstalledApp」 を意訳。 The Google OAuth 2.0 endpoint supports applications that are installed on a device (e.g. Mobile, Mac, PC). These applications are distributed to individual machines, and it is assumed that these applications cannot keep secrets. These applications may access a Google API while the user is present at the application
