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package khatru
import (
"context"
"errors"
"fmt"
"github.com/fiatjaf/eventstore"
"github.com/nbd-wtf/go-nostr"
)
// AddEvent sends an event through then normal add pipeline, as if it was received from a websocket.
func (rl *Relay) AddEvent(ctx context.Context, evt *nostr.Event) (skipBroadcast bool, writeError error) {
if evt == nil {
return false, errors.New("error: event is nil")
}
if nostr.IsEphemeralKind(evt.Kind) {
return false, rl.handleEphemeral(ctx, evt)
} else {
return rl.handleNormal(ctx, evt)
}
}
func (rl *Relay) handleNormal(ctx context.Context, evt *nostr.Event) (skipBroadcast bool, writeError error) {
for _, reject := range rl.RejectEvent {
if reject, msg := reject(ctx, evt); reject {
if msg == "" {
return true, errors.New("blocked: no reason")
} else {
return true, errors.New(nostr.NormalizeOKMessage(msg, "blocked"))
}
}
}
// Check to see if the event has been deleted by ID
for _, query := range rl.QueryEvents {
ch, err := query(ctx, nostr.Filter{
Kinds: []int{5},
Tags: nostr.TagMap{"#e": []string{evt.ID}},
})
if err != nil {
continue
}
target := <-ch
if target == nil {
continue
}
return true, errors.New("blocked: this event has been deleted")
}
// will store
// regular kinds are just saved directly
if nostr.IsRegularKind(evt.Kind) {
for _, store := range rl.StoreEvent {
if err := store(ctx, evt); err != nil {
switch err {
case eventstore.ErrDupEvent:
return true, nil
default:
return false, fmt.Errorf("%s", nostr.NormalizeOKMessage(err.Error(), "error"))
}
}
}
} else {
// Check to see if the event has been deleted by address
for _, query := range rl.QueryEvents {
dTagValue := ""
for _, tag := range evt.Tags {
if len(tag) > 0 && tag[0] == "d" {
dTagValue = tag[1]
break
}
}
address := fmt.Sprintf("%d:%s:%s", evt.Kind, evt.PubKey, dTagValue)
ch, err := query(ctx, nostr.Filter{
Kinds: []int{5},
Since: &evt.CreatedAt,
Tags: nostr.TagMap{"#a": []string{address}},
})
if err != nil {
continue
}
target := <-ch
if target == nil {
continue
}
return true, errors.New("blocked: this event has been deleted")
}
// otherwise it's a replaceable -- so we'll use the replacer functions if we have any
if len(rl.ReplaceEvent) > 0 {
for _, repl := range rl.ReplaceEvent {
if err := repl(ctx, evt); err != nil {
switch err {
case eventstore.ErrDupEvent:
return true, nil
default:
return false, fmt.Errorf("%s", nostr.NormalizeOKMessage(err.Error(), "error"))
}
}
}
} else {
// otherwise do it the manual way
filter := nostr.Filter{Limit: 1, Kinds: []int{evt.Kind}, Authors: []string{evt.PubKey}}
if nostr.IsAddressableKind(evt.Kind) {
// when addressable, add the "d" tag to the filter
filter.Tags = nostr.TagMap{"d": []string{evt.Tags.GetD()}}
}
// now we fetch old events and delete them
shouldStore := true
for _, query := range rl.QueryEvents {
ch, err := query(ctx, filter)
if err != nil {
continue
}
for previous := range ch {
if isOlder(previous, evt) {
for _, del := range rl.DeleteEvent {
del(ctx, previous)
}
} else {
// we found a more recent event, so we won't delete it and also will not store this new one
shouldStore = false
}
}
}
// store
if shouldStore {
for _, store := range rl.StoreEvent {
if saveErr := store(ctx, evt); saveErr != nil {
switch saveErr {
case eventstore.ErrDupEvent:
return true, nil
default:
return false, fmt.Errorf("%s", nostr.NormalizeOKMessage(saveErr.Error(), "error"))
}
}
}
}
}
}
for _, ons := range rl.OnEventSaved {
ons(ctx, evt)
}
// track event expiration if applicable
rl.expirationManager.trackEvent(evt)
return false, nil
}