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Added an endpoint that allows you to check whether an OAE user has made
a change to a pad in the last 15 minutes. Edits are tracked per pad/user
and are periodically cleaned.
That's what the first if clause is for. It's not the greatest security scheme, but since it's only the Hilary nodes that talk to etherpad over private interfaces it's probably ok. If somebody is snooping traffic on our private vlan we have bigger issues.