Flask extension for CAS

Flask-CAS is available on PyPI! You can install it with pip.

pip install Flask-CAS

If you want to do it the hard way you can clone the repository and install Flask-CAS in a virtualenv.

1. Clone it git clone [email protected]:cameronbwhite/Flask-CAS.git
2. Enter it cd Flask-CAS
3. Create a virtualenv and enter it (Optional) virtualenv venv && source venv/bin/activate
4. Install it python setup.py install

After Flask-CAS is installed you will be able to import the flask_cas packages. There is only one thing you care about inside the package which is the CAS class.

from flask_cas import CAS

There are two ways to use the CAS class.

1. Add the application object at construction time

   app = Flask(__name__)
   CAS(app)

2. Or initialize the application with CAS.init_app

   cas = CAS()
   app = Flask(__name__)
   cas.init_app(app)

The CAS class will add two routes /login/ and /logout/. You can prefix these routes if you pass a second argument to the CAS constructor or init_app depending on the method you choose.

The /login/ route will redirect the user to the CAS specified by the CAS_SERVER configuration value. If login is successful the user will be redirect to the endpoint specified by the CAS_AFTER_LOGIN configuration value, and the logged in user's username will be store in the session under the key specified by the CAS_USERNAME_SESSION_KEY configuration value.

The /logout/ route will redirect the user to the CAS logout page and the username will be removed from the session.

import flask
from flask import Flask

import flask_cas

app = Flask(__name__)
flask_cas.CAS(app, '/cas')
app.config['CAS_SERVER'] = 'https://sso.pdx.edu' 
app.config['CAS_AFTER_LOGIN'] = 'route_root'

@app.route('/')
def route_root():
    return flask.render_template(
        'layout.html',
        username = flask.session.get(app.config['CAS_USERNAME_SESSION_KEY'], None),
    )