code: def oauth_required(f):
          
          @wraps(f)
          def decorated_function(*args, **kwargs):
              if 'oauth_user_uri' not in session or session['oauth_user_uri'] is None:
                  return redirect(url_for('.r_oauth_login', next=request.url))
              return f(*args,**kwargs)
          return decorated_function
docs: decorator to add to a view to require an oauth user
          :return: decorated function