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filter.go
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filter.go
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package nostr
import (
"encoding/json"
"slices"
"github.com/mailru/easyjson"
)
type Filters []Filter
type Filter struct {
IDs []string
Kinds []int
Authors []string
Tags TagMap
Since *Timestamp
Until *Timestamp
Limit int
Search string
// LimitZero is or must be set when there is a "limit":0 in the filter, and not when "limit" is just omitted
LimitZero bool `json:"-"`
}
type TagMap map[string][]string
func (eff Filters) String() string {
j, _ := json.Marshal(eff)
return string(j)
}
func (eff Filters) Match(event *Event) bool {
for _, filter := range eff {
if filter.Matches(event) {
return true
}
}
return false
}
func (eff Filters) MatchIgnoringTimestampConstraints(event *Event) bool {
for _, filter := range eff {
if filter.MatchesIgnoringTimestampConstraints(event) {
return true
}
}
return false
}
func (ef Filter) String() string {
j, _ := easyjson.Marshal(ef)
return string(j)
}
func (ef Filter) Matches(event *Event) bool {
if !ef.MatchesIgnoringTimestampConstraints(event) {
return false
}
if ef.Since != nil && event.CreatedAt < *ef.Since {
return false
}
if ef.Until != nil && event.CreatedAt > *ef.Until {
return false
}
return true
}
func (ef Filter) MatchesIgnoringTimestampConstraints(event *Event) bool {
if event == nil {
return false
}
if ef.IDs != nil && !slices.Contains(ef.IDs, event.ID) {
return false
}
if ef.Kinds != nil && !slices.Contains(ef.Kinds, event.Kind) {
return false
}
if ef.Authors != nil && !slices.Contains(ef.Authors, event.PubKey) {
return false
}
for f, v := range ef.Tags {
if v != nil && !event.Tags.ContainsAny(f, v) {
return false
}
}
return true
}
func FilterEqual(a Filter, b Filter) bool {
if !similar(a.Kinds, b.Kinds) {
return false
}
if !similar(a.IDs, b.IDs) {
return false
}
if !similar(a.Authors, b.Authors) {
return false
}
if len(a.Tags) != len(b.Tags) {
return false
}
for f, av := range a.Tags {
if bv, ok := b.Tags[f]; !ok {
return false
} else {
if !similar(av, bv) {
return false
}
}
}
if !arePointerValuesEqual(a.Since, b.Since) {
return false
}
if !arePointerValuesEqual(a.Until, b.Until) {
return false
}
if a.Search != b.Search {
return false
}
if a.LimitZero != b.LimitZero {
return false
}
return true
}
func (ef Filter) Clone() Filter {
clone := Filter{
IDs: slices.Clone(ef.IDs),
Authors: slices.Clone(ef.Authors),
Kinds: slices.Clone(ef.Kinds),
Limit: ef.Limit,
Search: ef.Search,
LimitZero: ef.LimitZero,
}
if ef.Tags != nil {
clone.Tags = make(TagMap, len(ef.Tags))
for k, v := range ef.Tags {
clone.Tags[k] = slices.Clone(v)
}
}
if ef.Since != nil {
since := *ef.Since
clone.Since = &since
}
if ef.Until != nil {
until := *ef.Until
clone.Until = &until
}
return clone
}