Get basic user info from Google Oauth V2 api (since google is an extraordinary piece of shit when it comes to documenting their stuff) (or making admin consoles)

Gemfile

gem 'google-api-client'

get_userinfo.rb

require 'google/apis/oauth2_v2'

google = Google::Apis::Oauth2V2::Oauth2Service.new
signet = Signet::OAuth2::Client.new(
  authorization_uri:    'https://accounts.google.com/o/oauth2/auth',
  token_credential_uri: 'https://www.googleapis.com/oauth2/v3/token',
  client_id:            'YOUR_CLIENT_ID',
  # in my case, the code from line 17 is obtained from an android app,
  # therefore the client_secret is an empty string.
  # If you have a client_secret (for example if you have registered your google app as web application),
  # make sure to provide it here.
  client_secret:        '',
  scope:                'email profile', # if you need only the name and gender, feel free to remove the 'email' part
  redirect_uri:         'http://localhost/callback', # it has to match the redirect_uri provided when obtaining the code from line 17
)

signet.code = '4/R0V7NkJ_kD8Mj-MVFjfsTofPbB78oMSEjyTUAoFqpew' # https://developers.google.com/identity/protocols/OAuth2WebServer#handlingresponse - modify the link from section "Sample OAuth 2.0 server response" according to your project, then use the code passed after a redirect
signet.fetch_access_token!

google.authorization = signet
google.get_userinfo_v2
# => #<Google::Apis::Oauth2V2::Userinfoplus:0x007f916603a350 @email="google@is.shit", @family_name="Shit", @gender="male", @given_name="Shitter", @id="696969696969696969", @link="https://plus.google.com/696969696969696969", @locale="pl", @name="Shitter Shit", @picture="https://lh3.googleusercontent.com/-XXXXXXX/AAAAAAAAAAD/XCXCCCCCCC/42954939/photo.jpg", @verified_email=true>

Thank you! Agreed, Google docs is crap, I've been looking for an example like this for weeks...

@Struki84 glad I could’ve helped 🙂