Geting new access token using refresh token - Google oauth2

oauth2-google-refresh-token

### Method 1

gem install oauth2

require 'oauth2'

client = OAuth2::Client.new(GOOGLE_KEY, GOOGLE_SECRET, {:site => 'https://accounts.google.com', :authorize_url => "/o/oauth2/auth", :token_url => "/o/oauth2/token"})

response = OAuth2::AccessToken.from_hash(client, :refresh_token => REFRESH_TOKEN).refresh!

puts response.token
puts response.expires_at

### Methdo 2

gem install rest-client

## http://stackoverflow.com/questions/12572723/rails-google-client-api-unable-to-exchange-a-refresh-token-for-access-token
def refresh_token
  data = {
    :client_id => GOOGLE_KEY,
    :client_secret => GOOGLE_SECRET,
    :refresh_token => REFRESH_TOKEN,
    :grant_type => "refresh_token"
  }
  response = ActiveSupport::JSON.decode(RestClient.post "https://accounts.google.com/o/oauth2/token", data)
  if response["access_token"].present?
    # Save your token
  else
    # No Token
  end
rescue RestClient::BadRequest => e
  # Bad request
rescue
  # Something else bad happened
end

Thanks a lot for making this public! Very useful!