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simplify RestrictToSpecifiedKinds()

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fiatjaf
2024-05-12 20:54:53 -03:00
parent f8afb51ee9
commit 81ad56e85c
1 changed files with 0 additions and 21 deletions
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21
policies/events.go
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@@ -67,31 +67,10 @@ func PreventLargeTags(maxTagValueLen int) func(context.Context, *nostr.Event) (b
// RestrictToSpecifiedKinds returns a function that can be used as a RejectFilter that will reject
// any events with kinds different than the specified ones.
func RestrictToSpecifiedKinds(kinds ...uint16) func(context.Context, *nostr.Event) (bool, string) {
max := 0
min := 0
for _, kind := range kinds {
if int(kind) > max {
max = int(kind)
}
if int(kind) < min {
min = int(kind)
}
}
// sort the kinds in increasing order
slices.Sort(kinds)
return func(ctx context.Context, event *nostr.Event) (reject bool, msg string) {
// these are cheap and very questionable optimizations, but they exist for a reason:
// we would have to ensure that the kind number is within the bounds of a uint16 anyway
if event.Kind > max {
return true, fmt.Sprintf("event kind not allowed (it should be lower than %d)", max)
}
if event.Kind < min {
return true, fmt.Sprintf("event kind not allowed (it should be higher than %d)", min)
}
// hopefully this map of uint16s is very fast
if _, allowed := slices.BinarySearch(kinds, uint16(event.Kind)); allowed {
return false, ""
}