Created: 2012-03-24 18:52
Updated: 2015-08-17 19:40


This module contains some standard web framework functionality intended to integrate with the Aspen web framework. Aspen does not currently include these features, so I've created basic implementations of them:

  • Sessions
  • Single Request Messages
  • Authentication

The session and auth implementations use mongo_engine for storage. To use them, ensure trembling is on your path and make your Aspen hooks.conf look something like this:

# Startup Hooks

# Inbound Early Hooks

# Inbound Late Hooks

# Outbound Early hooks

# Outbound Late Hooks

# Shutdown Hooks

This assumes your project has a .aspen/ (you can change the startup hook if you prefer a different filename) to configure the database. At a bare minimum it'll look something like this:

from mongoengine import connect

def startup(website):
    website.db = connect("MY_DB_NAME")


There is a trembling.auth.User mongoengine document that you can use to access user data. The auth module also contains login, logout, and login_required methods. Call them from your simplate as

  • login(request, username, password)
  • logout(request)
  • login_required(request, "/login/page.html")

The latter will raise an appropriate redirect response if the user is not authenticated. If you do not specify a redirect url, it will redirect to trembling.auth.LOGIN_URL. This defaults to /account/login.html, or you can set it to a string of your choice in an aspen startup hook.

For an example of how these modules can be used in practice, see Todoy


If you put something in request.session['messages'] it will automatically be popped and submitted as request.messages in the following request. Note that it doesn't currently do any handling of combining multiple messages into a list or anything like that.


Testing requires py.test, and optionally, for code coverage, and pytest-cov. I have the following in my .bashrc:

py.test --cov=. --cov-report=html --cov-config=coveragerc


I'd like to remove the dependency on mongoengine by creating a pluggable session backend engine as is used in Django.

I'm not sure how secure this code is. I took and Django as input, but I've only implemented the bare minimum.

Pull requests are always welcome!

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