allow users who are not logged in to submit data first and then log in or register

I have a data submission form that is visible to everyone, but a user
must be registered & logged in before the data can be submitted

I want to allow users who are not logged in to submit data through
the form first, and then ask him to either register or log in. After
the registration/login process is finished, the data submitted by that
user would then be saved to the DB.

What's the best way to achieve that? It doesn't seem like the
@login_required decorator would work because the initial data
submitted by the user wouldn't be preserved by @login_required.

Is there a decorator similar to @login_required but would do what I
want?

Thanks.

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