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FAQ's

Where can I get my API key?

Get your API key at https://code.google.com/apis/console/

Where is the omniauth path to start the oauth2 handshake?

auth/google_oauth2

What does a response from google look like during the handshake?

{
  "provider" => "google_oauth2",
  "uid" => "100000000000000000000",
  "info" => {
    "name" => "John Smith",
    "email" => "[email protected]",
    "first_name" => "John",
    "last_name" => "Smith",
    "image" => "https://lh4.googleusercontent.com/photo.jpg",
    "urls" => {
      "google" => "https://plus.google.com/+JohnSmith"
    }
  },
  "credentials" => {
    "token" => "TOKEN",
    "refresh_token" => "REFRESH_TOKEN",
    "expires_at" => 1496120719,
    "expires" => true
  },
  "extra" => {
    "id_token" => "ID_TOKEN",
    "id_info" => {
      "azp" => "APP_ID",
      "aud" => "APP_ID",
      "sub" => "100000000000000000000",
      "email" => "[email protected]",
      "email_verified" => true,
      "at_hash" => "HK6E_P6Dh8Y93mRNtsDB1Q",
      "iss" => "accounts.google.com",
      "iat" => 1496117119,
      "exp" => 1496120719
    },
    "raw_info" => {
      "kind" => "plus#personOpenIdConnect",
      "gender" => "male",
      "sub" => "100000000000000000000",
      "name" => "John Smith",
      "given_name" => "John",
      "family_name" => "Smith",
      "profile" => "https://plus.google.com/+JohnSmith",
      "picture" => "https://lh4.googleusercontent.com/photo.jpg?sz=50",
      "email" => "[email protected]",
      "email_verified" => "true",
      "locale" => "en",
      "hd" => "company.com"
    }
  }
}

Tips on the scope parameter

• You don't need the https://www.googleapis.com/auth/ prefix.
• You provide a comma separated list, without spaces.

How to limit domains allowed for google at request time

As part of configuring the provider you can statically declare hd in order to limit the domains that can be requested from google.

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :google_oauth2, ENV['GOOGLE_CLIENT_ID'], ENV['GOOGLE_CLIENT_SECRET'], { hd: 'example.com' } 
end

To do this at runtime, the best way that i have found is to request to the authorize_path with the parameters you would like to inject.

# in rails link
Rails.application.routes.url_helpers.user_google_oauth2_omniauth_authorize_path({ hd: 'example.com' })