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Session based authentication and role based security for a Pyramid web application.

Project description

[pyramid_simpleauth][] is a package that implements session based authentication
and role based security for a [Pyramid][] web application.

There are many other auth implementations for Pyramid, including [apex][] and
[pyramid_signup][] and you can, of course, easily roll your own, for example
following the excellent [pyramid_auth_demo][]. This package aims to be:

* relatively simple, targeting a limited set of features
* extensible, with event hooks and overrideable templates
* performant, with, by default, one sql query per authenticated request

# Usage

Include the package (e.g. in your main application factory) along with a session
factory, `pyramid_tm` and `pyramid_basemodel` in the configuration portion of
your Pyramid app:

# Configure a session factory, here, we're using `pyramid_beaker`.
config.include('pyramid_beaker')
config.set_session_factory(session_factory_from_settings(settings))

# Either include `pyramid_tm` or deal with commiting transactions yourself.
config.include('pyramid_tm')

# Either include `pyramid_basemodel` and provide an `sqlalchemy.url` in your
# `.ini` settings, or bind the SQLAlchemy models and scoped `Session` to a
# database engine yourself.
config.include('pyramid_basemodel')

# Include the package.
config.include('pyramid_simpleauth')

Once that's done, the package locks down your application, exposes views at:

* /auth/signup
* /auth/login
* /auth/authenticate (login via AJAX)
* /auth/logout

Adds a `user` property to the current `request`:

# e.g.: in a view callable
if request.is_authenticated:
display = request.user.username

And provides `UserSignedUp`, `UserloggedIn` and `UserLoggedOut` events:

@subscriber(UserSignedUp)
def my_event_handler(event):
request = event.request
user = event.user
# e.g.: send confirmation email

# Templates

The signup and login forms inherit from a base layout template. You can override
this base layout template by writing your own, e.g.:

# my_package:my_templates/layout.mako
<!DOCTYPE HTML>
<html>
<head>
<title>${self.subtitle()}</title>
<link href="my_great.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="my-great-markup">
${next.body()}
</duv>
</body>
</html>

Then in your main app factory / package configuration use, e.g.:

config.override_asset(to_override='pyramid_simpleauth:templates/layout.mako',
override_with='my_package:my_templates/layout.mako')

Or you can override the signup and login templates individually, e.g.:

config.override_asset(to_override='pyramid_simpleauth:templates/signup.mako',
override_with='my_package:my_templates/foo.mako')
config.override_asset(to_override='pyramid_simpleauth:templates/login.mako',
override_with='my_package:my_templates/bar.mako')

# Settings

To change the url path for the authentication views, specify a
`simpleauth.url_prefix` in your application's `.ini` configuration:

# defaults to 'auth'
simpleauth.url_prefix = 'another'

To change where to redirect to after login (when a `next` parameter is not passed
to the login page) and after logout:

simpleauth.default_after_login_url = '/welcome/back'
simpleauth.after_logout_url = '/come/again'

To avoid configuring the authorisation and authentication policies (e.g.: if you're
going to set these up yourself) use:

simpleauth.set_auth_policies = false

To avoid locking down your app to require a 'view' permission for all views by
default (secure but perhaps draconian):

simpleauth.set_default_permission = False

# Tests

I've only tested the package under Python 2.6 and 2.7 atm. It should work under
Python 3 but I have problems installing the `passlib` dependency (or any decent
password encryption library) under Python 3.

You'll need `nose`, `coverage`, `mock` and `WebTest`. Then, e.g.:

$ nosetests --cover-package=pyramid_simpleauth --cover-tests --with-doctest --with-coverage
..........................................
Name Stmts Miss Cover Missing
---------------------------------------------------------
pyramid_simpleauth 19 0 100%
pyramid_simpleauth.events 26 0 100%
pyramid_simpleauth.hooks 13 0 100%
pyramid_simpleauth.model 56 0 100%
pyramid_simpleauth.schema 83 0 100%
pyramid_simpleauth.tests 197 0 100%
pyramid_simpleauth.tree 18 0 100%
pyramid_simpleauth.view 76 0 100%
---------------------------------------------------------
TOTAL 488 0 100%
----------------------------------------------------------------------
Ran 42 tests in 16.408s

OK

[apex]: https://github.com/cd34/apex
[pyramid]: http://pyramid.readthedocs.org
[pyramid_auth_demo]: https://github.com/mmerickel/pyramid_auth_demo
[pyramid_signup]: https://github.com/sontek/pyramid_signup
[pyramid_simpleauth]: http://github.com/thruflo/pyramid_simpleauth

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