Fix broken LoginManager

[lukasjuhrich]

The custom LoginManager implementation has two problems:

• It somehow causes the user information to be loaded on the /static endpoint. This is a performance problem, because it means an API call for every time a logged in user visits one of these endpoints.
• It does not cause any user loading to be disabled in the /documents endpoint because the disable_user_loading endpoint has never been set.

sipa/sipa/login_manager.py

Lines 9 to 54 in b8d1188

	class SipaLoginManager(LoginManager):
	def __init__(self, *a, **kw):
	super().__init__(*a, **kw)
	self.localize_callback = gettext
	self.login_message = "Bitte melde Dich an, um die Seite zu sehen."
	self.ignored_endpoints = set()
	self._wrapped_user_callback = None
	def ignore_endpoint(self, endpoint_name):
	self.ignored_endpoints.add(endpoint_name)
	def disable_user_loading(self, bp=None):
	"""The decorator version of :py:meth:`ignore_endpoint`
	Use as `@login_manager.disable_user_loading()` or
	`@login_manager.disable_user_loading(bp)`.
	"""
	if bp is None:
	def endpoint_name(f):
	return f.__name__
	else:
	if not isinstance(bp, Blueprint):
	raise TypeError("Must call `disable_user_loading`"
	" with instance of `Blueprint`")
	def endpoint_name(f):
	return "{}.{}".format(bp.name, f.__name__)
	def decorate(f):
	self.ignore_endpoint(endpoint_name(f))
	return f
	return decorate
	@property
	def user_callback(self):
	return self._wrapped_user_callback
	@user_callback.setter
	def user_callback(self, f):
	@wraps(f)
	def wrapped_user_callback(user_id):
	if request.endpoint in self.ignored_endpoints:
	return self.anonymous_user()
	return f(user_id)
	self._wrapped_user_callback = wrapped_user_callback