Python API: Authorization

View on Github

Python API: Authorization

Gravatar for
By Luciano Balmaceda

This tutorial demonstrates how to add authorization to a Python API built with Flask. We recommend you to Log in to follow this quickstart with examples configured for your account.


I want to explore a sample app

2 minutes

Get a sample configured with your account settings or check it out on Github.

View on Github
System requirements: python 2.7, 3.3 and up | flask 0.11.1 | python-jose-cryptodome 1.3.2 | flask-cors 3.0.2 | six 1.10.0

New to Auth0? Learn how Auth0 works and read about implementing API authentication and authorization using the OAuth 2.0 framework.

Keep reading

Configure Auth0 APIs

Create an API

In the APIs section of the Auth0 dashboard, click Create API. Provide a name and an identifier for your API, for example https://quickstarts/api. You will use the identifier as an audience later, when you are configuring the Access Token verification. Leave the Signing Algorithm as RS256.

Create API

By default, your API uses RS256 as the algorithm for signing tokens. Since RS256 uses a private/public keypair, it verifies the tokens against the public key for your Auth0 account. The public key is in the JSON Web Key Set (JWKS) format, and can be accessed here.

Define Permissions

Permissions let you define how resources can be accessed on behalf of the user with a given access token. For example, you might choose to grant read access to the messages resource if users have the manager access level, and a write access to that resource if they have the administrator access level.

You can define allowed permissions in the Permissions tab of the Auth0 Dashboard's APIs section.

Configure Permissions

This example uses the read:messages scope.

This example demonstrates:

  • How to check for a JSON Web Token (JWT) in the Authorization header of an incoming HTTP request.

  • How to check if the token is valid, using the JSON Web Key Set (JWKS) for your Auth0 account. To learn more about validating Access Tokens, read the Validate an Access Token tutorial.

Validate Access Tokens

Install dependencies

Add the following dependencies to your requirements.txt:

Create a Flask application

Create a file and initialize the Flask application. Set the domain, audience and the error handling.

Create the JWT validation decorator

Add a decorator which verifies the Access Token against your JWKS.

Validate scopes

Individual routes can be configured to look for a particular scope in the Access Token by using the following:

Protect API Endpoints

The routes shown below are available for the following requests:

  • GET /api/public: available for non-authenticated requests
  • GET /api/private: available for authenticated requests containing an Access Token with no additional scopes
  • GET /api/private-scoped: available for authenticated requests containing an Access Token with the read:messages scope granted

You can use the decorators and functions define above in the corresponding endpoints.

Use Auth0 for FREE