Script for read google drive

gistfile1.rb

require 'google_drive'

client = Google::APIClient.new(application_name: 'Google Drive Ruby test', application_version: '0.0.1')
key = Google::APIClient::KeyUtils.load_from_pkcs12(
    'path to your p12 key file (all the path with file name)',
    'your secret here given at download file it seems to be always the same: notasecret')

asserter = Google::APIClient::JWTAsserter.new(
    'service account - email address - here',
    ['https://www.googleapis.com/auth/drive'],
    key
)
client.authorization = asserter.authorize
session = GoogleDrive.login_with_oauth(client.authorization.access_token)

# access data
# all files shared with the 'email address' at asserter
session.files { |file| puts file }

# some spreadsheet
spreadsheet = session.spreadsheet_by_key('the alpha key at the link')