experimental nip29 support.

event.go

@@ -32,12 +32,22 @@ const (
 	KindDeletion                    int = 5
 	KindRepost                      int = 6
 	KindReaction                    int = 7
+	KindSimpleGroupChatMessage      int = 9
+	KindSimpleGroupThread           int = 11
+	KindSimpleGroupReply            int = 12
 	KindChannelCreation             int = 40
 	KindChannelMetadata             int = 41
 	KindChannelMessage              int = 42
 	KindChannelHideMessage          int = 43
 	KindChannelMuteUser             int = 44
 	KindFileMetadata                int = 1063
+	KindSimpleGroupAddUser          int = 9000
+	KindSimpleGroupRemoveUser       int = 9001
+	KindSimpleGroupEditMetadata     int = 9002
+	KindSimpleGroupAddPermission    int = 9003
+	KindSimpleGroupRemovePermission int = 9004
+	KindSimpleGroupDeleteEvent      int = 9005
+	KindSimpleGroupEditGroupStatus  int = 9006
 	KindZapRequest                  int = 9734
 	KindZap                         int = 9735
 	KindMuteList                    int = 10000
@@ -56,6 +66,9 @@ const (
 	KindProductDefinition           int = 30018
 	KindArticle                     int = 30023
 	KindApplicationSpecificData     int = 30078
+	KindSimpleGroupMetadata         int = 39000
+	KindSimpleGroupAdmins           int = 39001
+	KindSimpleGroupMembers          int = 39002
 )
 
 // Event Stringer interface, just returns the raw JSON as a string.

nip29/group.go

@@ -0,0 +1,86 @@
+package nip29
+
+import (
+	"fmt"
+
+	"github.com/nbd-wtf/go-nostr"
+)
+
+type Group struct {
+	ID      string
+	Name    string
+	Picture string
+	About   string
+	Members map[string]*Role
+	Private bool
+	Closed  bool
+
+	LastMetadataUpdate nostr.Timestamp
+}
+
+func (group Group) ToMetadataEvent() *nostr.Event {
+	evt := &nostr.Event{
+		Kind:      39000,
+		CreatedAt: group.LastMetadataUpdate,
+		Content:   group.About,
+		Tags: nostr.Tags{
+			nostr.Tag{"d", group.ID},
+		},
+	}
+	if group.Name != "" {
+		evt.Tags = append(evt.Tags, nostr.Tag{"name", group.Name})
+	}
+	if group.About != "" {
+		evt.Tags = append(evt.Tags, nostr.Tag{"about", group.Name})
+	}
+	if group.Picture != "" {
+		evt.Tags = append(evt.Tags, nostr.Tag{"picture", group.Picture})
+	}
+
+	// status
+	if group.Private {
+		evt.Tags = append(evt.Tags, nostr.Tag{"private"})
+	} else {
+		evt.Tags = append(evt.Tags, nostr.Tag{"public"})
+	}
+	if group.Closed {
+		evt.Tags = append(evt.Tags, nostr.Tag{"closed"})
+	} else {
+		evt.Tags = append(evt.Tags, nostr.Tag{"open"})
+	}
+
+	return evt
+}
+
+func (group *Group) MergeInMetadataEvent(evt *nostr.Event) error {
+	if evt.Kind != nostr.KindSimpleGroupMetadata {
+		return fmt.Errorf("expected kind %d, got %d", nostr.KindSimpleGroupMetadata, evt.Kind)
+	}
+
+	if evt.CreatedAt <= group.LastMetadataUpdate {
+		return fmt.Errorf("event is older than our last update (%d vs %d)", evt.CreatedAt, group.LastMetadataUpdate)
+	}
+
+	group.LastMetadataUpdate = evt.CreatedAt
+	group.ID = evt.Tags.GetD()
+	group.Name = group.ID
+
+	if tag := evt.Tags.GetFirst([]string{"name", ""}); tag != nil {
+		group.Name = (*tag)[1]
+	}
+	if tag := evt.Tags.GetFirst([]string{"about", ""}); tag != nil {
+		group.About = (*tag)[1]
+	}
+	if tag := evt.Tags.GetFirst([]string{"picture", ""}); tag != nil {
+		group.Picture = (*tag)[1]
+	}
+
+	if tag := evt.Tags.GetFirst([]string{"private"}); tag != nil {
+		group.Private = true
+	}
+	if tag := evt.Tags.GetFirst([]string{"closed"}); tag != nil {
+		group.Closed = true
+	}
+
+	return nil
+}

nip29/nip29.go

@@ -0,0 +1,46 @@
+package nip29
+
+import (
+	"github.com/nbd-wtf/go-nostr"
+	"golang.org/x/exp/slices"
+)
+
+type Role struct {
+	Name        string
+	Permissions map[Permission]struct{}
+}
+
+type Permission = string
+
+const (
+	PermAddUser          Permission = "add-user"
+	PermEditMetadata     Permission = "edit-metadata"
+	PermDeleteEvent      Permission = "delete-event"
+	PermRemoveUser       Permission = "remove-user"
+	PermAddPermission    Permission = "add-permission"
+	PermRemovePermission Permission = "remove-permission"
+	PermEditGroupStatus  Permission = "edit-group-status"
+)
+
+type KindRange []int
+
+var ModerationEventKinds = KindRange{
+	nostr.KindSimpleGroupAddUser,
+	nostr.KindSimpleGroupRemoveUser,
+	nostr.KindSimpleGroupEditMetadata,
+	nostr.KindSimpleGroupAddPermission,
+	nostr.KindSimpleGroupRemovePermission,
+	nostr.KindSimpleGroupDeleteEvent,
+	nostr.KindSimpleGroupEditGroupStatus,
+}
+
+var MetadataEventKinds = KindRange{
+	nostr.KindSimpleGroupMetadata,
+	nostr.KindSimpleGroupAdmins,
+	nostr.KindSimpleGroupMembers,
+}
+
+func (kr KindRange) Includes(kind int) bool {
+	_, ok := slices.BinarySearch(kr, kind)
+	return ok
+}