Book Image

Mastering Flask Web Development - Second Edition

By : Daniel Gaspar, Jack Stouffer
Book Image

Mastering Flask Web Development - Second Edition

By: Daniel Gaspar, Jack Stouffer

Overview of this book

Flask is a popular Python framework known for its lightweight and modular design. Mastering Flask Web Development will take you on a complete tour of the Flask environment and teach you how to build a production-ready application. You'll begin by learning about the installation of Flask and basic concepts such as MVC and accessing a database using an ORM. You will learn how to structure your application so that it can scale to any size with the help of Flask Blueprints. You'll then learn how to use Jinja2 templates with a high level of expertise. You will also learn how to develop with SQL or NoSQL databases, and how to develop REST APIs and JWT authentication. Next, you'll move on to build role-based access security and authentication using LDAP, OAuth, OpenID, and database. Also learn how to create asynchronous tasks that can scale to any load using Celery and RabbitMQ or Redis. You will also be introduced to a wide range of Flask extensions to leverage technologies such as cache, localization, and debugging. You will learn how to build your own Flask extensions, how to write tests, and how to get test coverage reports. Finally, you will learn how to deploy your application on Heroku and AWS using various technologies, such as Docker, CloudFormation, and Elastic Beanstalk, and will also learn how to develop Jenkins pipelines to build, test, and deploy applications.
Table of Contents (15 chapters)

Flask-Login overview

Flask-Login is a popular Flask extension for handling the process of logging users in and out, properly handling cookie sessions, and even using basic authentication with HTTP headers. It will set up callbacks for user loading, header authentication, logging in, logging out, unauthorized events, and so on.

To start using Flask-Login, we first need to declare it as a dependency on our requirements.txt, as shown in the following code:

...
Flask-Login
...

Then, we need to update our Python virtual environment as follows:

$ source venv/bin/activate
$ pip install -r requirements.txt
If you have executed the provided init.sh script, then there is no need to update the virtualenv. All the required dependencies for this chapter are already installed.

To use the session and login flow implemented by Flask-Login, we will need to do the following:

  • Change the user model...