Pyramid Google Login

Pyramid authentication policy for Google login (OAuth2 server-side flow)

This extension doesn't configure any authentication policy. You are responsible of setting the proper security configuration in your Pyramid application. When authenticated by Google, this extension calls the method pyramid.security.remember and assume the authentication policy will remember the user identity.

• PyPI: https://pypi.python.org/pypi/pyramid_google_login
• Code: https://github.com/ludia/pyramid_google_login
• Tests:

Installation

Install using setuptools, e.g. (within a virtualenv):

$ pip install pyramid_google_login

Setup: Application

Once pyramid_google_login is installed, you must use the config.include mechanism to include it into your Pyramid project's configuration. In your Pyramid project's __init__.py:

config = Configurator(.....)
config.include('pyramid_google_login')

Alternately you can use the pyramid.includes configuration value in your .ini file:

[app:myapp]
pyramid.includes = pyramid_google_login

Setup: settings

Mandatory settings:

security.google_login.client_id = xxxxxxx.apps.googleusercontent.com
security.google_login.client_secret = xxxxxxxxxxxxxxxxxxxxxxxxx

Optional settings:

# List of Google scopes (``email`` is automatically included)
security.google_login.scopes = email

# Set the access type to ``offline`` to get a refresh_token (default: online)
security.google_login.access_type = online

# Field used to extract the userid (generally ``email`` or ``id``)
security.google_login.user_id_field = email

# Restrict authentication to a Google Apps domain
security.google_login.hosted_domain = example.net

# Redirect destination for logged in user.
security.google_login.landing_url = /
security.google_login.landing_route = my_frontend_route
security.google_login.landing_route = mymodule:static/

# Add a banner on the sign in page
security.google_login.signin_banner = Welcome on Project Euler

# Add an advice on the sign in page
security.google_login.signin_advice = Ask Dilbert for access

Setup: Google project

• Create a project on https://console.developers.google.com

• Create a OAuth Client ID

  • Choose a Web Application application type

  • Add all variants of your host in Javascript Origins

    • Secure and non secure url are differentiated
    • Optionally include your development host with http://localhost:6543 rather than an http://127.0.0.1:6543 (it would be refused)

Notes:

• No Permissions are needed by pyramid_google_login itself.
• Client ID parameters are heavily cached. In development, re-creating a client id is often the best idea.

General Usage

When a user must be authenticated by Google, he must be sent to the auth_signin route url. The helper method pyramid_google_login.redirect_to_signin redirect the user to the sign in page. This helper is handy to specify the next url and an optional message.

@forbidden_view_config()
def unauthenticated(context, request):
    return redirect_to_signin(request, url=request.path_qs)

Once the user is authenticated, the UserLoggedIn pyramid event is broadcasted. The application can perform subsequent validations, create the user profile or update it.

After that, the pyramid.security.remember helper is called.

Then, the user will be redirected to an url specified by:

• query parameter (signin page): url
• setting: security.google_login.landing_url
• fallback: /

When a user must be logged out, he must be directed on the auth_logout route url. Once logged out, he will be redirected back to the sign in page.

Offline Usage

If you want to call the Google APIs on behalf of the user, you must store the OAuth2 tokens provided in the UserLoggedIn event. The access_token is usable for an expires_in period. Then the refresh_token must be used to refresh the access_token. This refresh_token is valide until the user revoke the application permissions.

By default, the only scope requested is email to identify the user. To call other Google APIs, you must add the related scopes as this:

[app:myapp]

security.google_login.scopes =
    email
    https://www.googleapis.com/auth/admin.directory.user.readonly

Events

UserLoggedIn

The user has logged in by Google.

Properties:

• userid
• oauth2_token
  • access_token
  • expires_in
  • refresh_token
• user_info
  • Google user_info properties...

UserLoggedOut

The user has logged out.

Properties:

• userid

Development

This project supports Dad (https://github.com/pior/dad).

Running tests:

$ pip install -r requirements.txt
$ nosetests

Running pylama (linters):

$ pylama

Create a new release:

$ dad release 1.0