oauth_echo_example.rb

def _authenticate_oauth_echo
  require 'httparty'
  # header auth only for now; also lock down the auth provider endpoint so we can't spoof
  if(request.env["HTTP_X_AUTH_SERVICE_PROVIDER"] != 'https://api.twitter.com/1/account/verify_credentials.json' || request.env["HTTP_X_AUTH_SERVICE_PROVIDER"].blank?)
    return false
  else
    auth_service_provider = request.env["HTTP_X_AUTH_SERVICE_PROVIDER"]
    verify_credentials_authorization = request.env["HTTP_X_VERIFY_CREDENTIALS_AUTHORIZATION"]
  end
  
  auth_response = HTTParty.get(auth_service_provider, :format => :json, :headers => {'Authorization' => verify_credentials_authorization}) rescue nil
  if !auth_response['screen_name'].blank?
    current_user = User.find(:first, :conditions => {:login => auth_response['screen_name']})
    return current_user
  end
  logger.info(auth_response)
  return false
end