authenticate.rb

require 'base64'

def authenticate
  if ENV['ANALYTICS_DATA_CREDENTIALS']
    # If ANALYTICS_DATA_CREDENTIALS is already set, assume it's pointing to a local file
    puts "Using local credentials from ANALYTICS_DATA_CREDENTIALS."
  else
    if ENV['HEROKU_ANALYTICS_DATA_CREDENTIALS']
      # Decode the service account JSON from the HEROKU_ANALYTICS_DATA_CREDENTIALS environment variable
      service_account_json = Base64.decode64(ENV['HEROKU_ANALYTICS_DATA_CREDENTIALS'])

      # Determine the path to key_temp.py in the same directory as the current script
      current_directory = File.dirname(__FILE__)
      service_account_file_path = File.join(current_directory, 'key_temp.json')

      # Write the decoded JSON to key_temp.py, overriding the file if it already exists
      File.open(service_account_file_path, 'w') do |file|
        file.write(service_account_json)
      end

      # Set the environment variable to the path of the file
      ENV['ANALYTICS_DATA_CREDENTIALS'] = service_account_file_path

      puts "Using credentials from HEROKU_ANALYTICS_DATA_CREDENTIALS and writing to key_temp.json."
    else
      raise "HEROKU_ANALYTICS_DATA_CREDENTIALS environment variable is not set."
    end
  end
end