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

Project Description
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[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: with a limited feature set
* extensible: with event hooks and overrideable templates
* performant: minimising db queries

# Features

If you install the package and include it in your Pyramid application, it will
lock down your application and expose views at:

* /auth/signup
* /auth/login
* /auth/authenticate (login via AJAX)
* /auth/logout
* /auth/change\_username
* /auth/change\_password
* /auth/confirm (email confirmation)
* /auth/prefer\_email (set email as the user's preferred email)

You get a `user` instance and an `is_authenticated` flag added to the `request`:

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

Plus `UserSignedUp`, `UserloggedIn`, `UserLoggedOut`, `UserChangedPassword`,
`UserChangedUsername`, `EmailPreferred` and `EmailAddressConfirmed` events to
subscribe to:

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

Flags at `request.is_post_login` and `request.is_post_signup`, stored in the session,
that allow you to test whether the current request is immediately after a login or
signup event. And a `request.user_json` property (useful to write into a template
to pass data to the client side).

`model.get_confirmation_link(request, email)` returns a `confirmation_link`
that will be accepted by `/auth/confirm` and that can typically be included in
an email sent to a user who wish to validate an email address.

The `EmailAddressConfirmed` and `EmailPreferred` events give you access to the
`Email` object as `['email']`, eg:

def email_address_confirmed(event):
email_address =['email'].address
session = event.request.session
session.flash("%s has been confirmed successfully" % email_address)

# Install

Install using `pip` or `easy_install`, e.g.:

pip install pyramid_simpleauth

# Configure

Include the package 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`.

# Either include `pyramid_tm` or deal with committing transactions yourself.

# 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.

# Include the package.

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
<link href="my_great.css" rel="stylesheet" type="text/css" />
<div class="my-great-markup">

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


Or you can nuke the signup and login templates directly, e.g.:


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

# defaults to 'auth', resulting in urls that start with `/auth/...`
simpleauth.url_prefix = 'another'

You can also specify where to redirect to after signup, login, logout, username
change, password change, email confirmation or preferred email selection. These
are all configured using *route names*, with the route being provided the
additional traversal information of the user's username and an optional view
name. (This means you can expose a simple named route, or a hybrid route, as
you prefer. The hybrid route will attempt traversal on the username).

To redirect to a different named route after signup / login or logout use:

simpleauth.after_signup_route = 'another' # defaults to 'users'
simpleauth.after_login_route = 'another' # defaults to 'index'
simpleauth.after_logout_route = 'another' # defaults to 'index'

Note that a `next` parameter passed to the login page, password
change page, username change page, email confirmation page or preferred email
selection page will take precedence over the specific routes.

To redirect to a different route and view after login, password change, username
change, email confirmation or preferred email selection, use configuration
directives such as:

simpleauth.after_confirm_email_route = 'basepath' # defaults to 'users'
simpleauth.after_confirm_email_view = 'viewname', # defaults to 'account'

This would redirect user bob to `/basepath/bob/viewname`. Redirect configuration
directives for each of those views are named following the patterns
`simpleauth.after_<view_name>_route` and `simpleauth.after_<view_name>_view`,
where `<view_name>` can be any of `login`, `change_username`,
`change_password`, `confirm_email` and `prefer_email`.

Be careful in the case of username change because if your `next` URL contains a
username, it won't be valid anymore after the username has changed, eg. if you
instruct the username change page to redirect to `/basepath/bob/viewname` but
the username changes to become alice, the redirect will cause a "page not found"
error. In this case, if you want to include a username in your custom redirect,
you should use the configuration-based redirect location will take into account
the new username.

By default the app redirects after signup to a route named 'users'. This is
not exposed by `pyramid_simpleauth` by default but the package does provide a
`.tree.UserRoot` root factory that looks up `.model.User`s by username and a
default `__acl__` property on the `.model.User` class. These are entirely
optional: you can choose instead to use a different named route, or expose
a simple named route using, e.g.:

config.add_route('users', 'some/path')

However, if you want to use the machinery provided, with the baked in security
and traversal, you can expose a user profile view, or perhaps a welcome page at
`/users/:username` using, e.g.:

config.add_route('users', 'users/*traverse', factory=UserRoot,

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% 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


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