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Starlette OAuth2

A Startlette middleware for authentication and authorization through oauth2.

This middleware is intented to be used when the application relies on an external tenant (e.g. Microsoft AD) for authentication, and the organization's user groups (externally administred) for authorization.

It assumes that a user that is not authenticated is not authorized to do anything.

Check example/ for a concrete implementation.

How to run the example

This guide uses Microsoft (Azure AD) as the tenant. Refer to your tenant for details.

The values in capital such as CLIENT_ID are to be replaced in example/.venv.

  1. Generate a secret and write its value on SECRET_KEY

  2. Go to Azure AD, create an app registration (app registrations), give it a name, and add http://localhost:5001/authorized as a Redirect URI.

    • replace the value on CLIENT_ID by the value on Application (client) ID
    • replace the value on TENANT_ID by the value on Directory (tenant) ID
  3. In Certificates & secrets, create a new client secret.

    • replace the value on CLIENT_SECRET by the value of the key you just created under Client secrets
  4. Go to Azure AD groups and create a new group.

    • replace the value on USER_GROUP_ID by the Object ID of that group.
  5. Install dependencies and run:

cd examples
python -m venv venv
venv/bin/pip install -r requirements.txt
python -m app

When you visit http://localhost:5001, you will be redirected to your tenant, to authorize access. Once authorized, you will be redirected back to http://localhost:5001, and your email will appear. If you try http://localhost:5001/private, you will get a message that you are not authorized to see that.

If you add yourself to the group created in step 3, you are now authorized to see http://localhost:5001/private.

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