FormBuilder: settings for token timeout and redirection url

[colemanw]

Overview

Allow authentication token validity period to be set on form and redirect to an alternative URL if authentication token fails.

Rebase of PR #26983 with additional unit tests added to address feedback from that PR.

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[aydun]

Thanks for resurrecting this one @colemanw

[mattwire]

@colemanw So if you later change the timeout/expiry on the form it will apply retrospectively? That seems like a good idea as it effectively gives you a revocation path.

[colemanw]

No, it will not apply retrospectively.
When Tokens::createUrl() generates the token URL (_aff=Bearer <jwt>), the expiration timestamp (exp) is calculated at the moment of URL creation (time() + (timeout * 86400)) and signed inside the JWT payload.