I'd like to try to close the loop on this.  I'm hearing pretty broad
agreement here on a few points:

- We should keep the full URL in the agreement field
- The server can update that URL if it doesn't need re-agreement
- The server should indicate the need for agreement with an error

Based on that, I've put together a PR that does the following:

- Add an "agreementRequired" error type
- Require the server to return that error type and the ToS URL when it
requires (re-)agreement
- Allow the server to update the agreement URL if re-agreement is not
required

https://github.com/ietf-wg-acme/acme/pull/182


On Sat, Aug 6, 2016 at 2:30 PM, Jacob Hoffman-Andrews <[email protected]> wrote:

> Let's Encrypt recently did its first update of its Subscriber Agreement,
> and ran into some incompatibility. The current spec makes it seem like
> the client should update the registration object whenever the Subscriber
> Agreement (known in ACME as terms-of-service) changes.
>
> However, early in drafting LE's Subscriber Agreement, we realized that
> if we required human approval of Subscriber Agreement changes, that
> would break auto-renewal. So our Subscriber Agreement says that updates
> automatically apply to existing users after a notice period.*
>
> The existing ACME terms-of-service flow is an awkward hold-over from
> when we treated the new-reg URL as the entry point. Currently you create
> an account, get told the ToS URL, and update the account object with
> that URL. That then gets stored as a property of the registration object
> forever.
>
> Now that we have the directory object, and it contains a
> terms-of-service URL, we can say that for CAs with a terms-of-service
> URL, you must agree before you can create an account. We can have an
> "agree": true field in the new-reg POST to signal agreement to the
> current terms-of-service from the directory object. Then the
> terms-of-service URL doesn't need to be a permanent part of the
> registration object, and we can avoid ambiguity over whether and when
> clients need to update or check it.
>
> What do you think?
>
>
>
>
> *As much as I dislike these types of agreement as a consumer, I think
> it's the only reasonable approach to allow robust automatic issuance
>
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