Findings from a review of the earlier commits.
A key rotation dropped the device key pairs along with the wrapped user
keys, so the devices listed in `/devices/update-trust` could never be
trusted again and silently lost their trust on every rotation. Those key
pairs are wrapped with the device key, which a rotation does not touch, so
they now stay and the re-wrap works. The invalidation also moved ahead of
the new user key: failing after it had been written left devices handing
out a key that no longer opens the vault.
The three key blobs are now checked against the shape of an `EncString`
instead of only for emptiness, as upstream does, which also keeps
multi-megabyte values out of those columns.
`/auth-requests/admin-request` is rate limited and reuses the open request
of a device instead of adding one per attempt, which mailed every
administrator again each time. Only confirmed memberships are asked, and
answered: an invitation that was never accepted is not a membership yet, a
revoked one is not one anymore, and neither should learn the address, the
IP and the device of the asker. `UserDecryptionOptions` reports the same
condition, so no way out is announced that would be refused when taken.
The bulk endpoints skip what they cannot answer rather than failing the
whole call after having answered everything before it, matching upstream,
and are bounded. The purge does its work per type in the database instead
of reading the table and deleting row by row, with indexes to go with it.
Also: approving an auth request is limited to the newest one of a device,
`GET /auth-requests/<id>` refuses an expired request like the anonymous
lookup already did, the approval notification addresses the device that
asked rather than the administrator's, and accepting an invitation while
enrolling is tied to the trusted device flow it was meant for.
tom27052006
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