2.1 KiB
NIP-22
Event created_at Limits
draft optional author:jeffthibault
Relays may define both upper and lower limits for which they will consider an event's created_at time to be acceptable if it is within those limits. Both the upper and lower limits MUST be unix timestamps to match the format of the event's created_at field. The upper limit restricts how far into the future an event's created_at time can be set to and the lower limit restricts how far into the past an event's created_at time can be set to.
If a relay supports this NIP, the relay SHOULD send the client a NOTICE message saying the event was not stored when the created_at time is not within the upper and lower limits.
Client Behavior
Clients SHOULD use the supported_nips field to learn if a relay uses event created_at time limits as defined by this NIP.
Motivation
The motivation for this NIP is to formalize a way for relays to restrict event timestamps to times they deem to be acceptable and allow clients to be aware of relays that have these restrictions.
The event created_at field is just a unix timestamp and can be set to a time in the past or future. For example, the created_at field can be set to a time 20 years ago even though it was created today and still be a valid event. It can also be set to a time 20 years in the future and still be a valid event. This NIP aims to define a way for relays that do not want to store events with any timestamp to set their own restrictions.
A wide adoption of this could create a better UX on clients as well because it would decrease the likelihood of the user seeing events from dates such as 1984 or 2084, which could be confusing.
Python Example
import time
UPPER_LIMIT = int(time.now) + 900 # Define upper limit as 15 minutes into the future
LOWER_LIMIT = int(time.now) - 86400 # Define lower limit as 1 day into the past
if event.created_at < LOWER_LIMIT or event.created_at > UPPER_LIMIT:
ws.send('["NOTICE", "The event created_at field is out of the acceptable range for this relay and was not stored."]')