Apple OAuth2 example doesn't work

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Prerequisites

• [X] I have written a descriptive issue title
• [X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.26.1

Plugin version

7.8.0

Node.js version

v20.6.1

Operating system

Windows

Operating system version (i.e. 20.04, 11.3, 10)

10

Description

I created the issue, so that it clarifies the issue or helps other people.

I had to make changes to make the example work. examples/apple.js

Explicitly setting scope to empty (otherwise undefined error) scope: [], //'name', 'email' , when I set scope apple returns POST form-urlencoded. That is documented in the example and Github issues. It might be nice to provide an example for that case as well.

const { code, state, error, user } = request.query instead of request.body

Wher does Error.CancelledAuth comes from? It is undefined so it has wrong logic when error is also undefined.

The part I didn't understand: request.cookies['oauth2-redirect-state'] this is empty, however the cookie is set in browser dev tools.

Readme states, "Since v7.2.0, @fastify/oauth2 requires the use of cookies to securely implement the OAuth2 exchange." It is after this example is updated on the repo.

Steps to Reproduce

Create a new project npm init fastify and try examples/apple.js example

Expected Behavior

No response