nip29: bring in helpers for managing groups to be used on the relay side.

nip29/group.go

@@ -16,11 +16,13 @@ type Group struct {
 	Closed  bool
 
 	LastMetadataUpdate nostr.Timestamp
+	LastAdminsUpdate   nostr.Timestamp
+	LastMembersUpdate  nostr.Timestamp
 }
 
 func (group Group) ToMetadataEvent() *nostr.Event {
 	evt := &nostr.Event{
-		Kind:      39000,
+		Kind:      nostr.KindSimpleGroupMetadata,
 		CreatedAt: group.LastMetadataUpdate,
 		Content:   group.About,
 		Tags: nostr.Tags{
@@ -52,6 +54,47 @@ func (group Group) ToMetadataEvent() *nostr.Event {
 	return evt
 }
 
+func (group Group) ToAdminsEvent() *nostr.Event {
+	evt := &nostr.Event{
+		Kind:      nostr.KindSimpleGroupAdmins,
+		CreatedAt: group.LastAdminsUpdate,
+		Tags:      make(nostr.Tags, 1, 1+len(group.Members)/3),
+	}
+	evt.Tags[0] = nostr.Tag{"d", group.ID}
+
+	for member, role := range group.Members {
+		if role != nil {
+			// is an admin
+			tag := make([]string, 0, 3+len(role.Permissions))
+			tag[0] = "p"
+			tag[1] = member
+			tag[2] = role.Name
+			for perm := range role.Permissions {
+				tag = append(tag, string(perm))
+			}
+			evt.Tags = append(evt.Tags, tag)
+		}
+	}
+
+	return evt
+}
+
+func (group Group) ToMembersEvent() *nostr.Event {
+	evt := &nostr.Event{
+		Kind:      nostr.KindSimpleGroupMembers,
+		CreatedAt: group.LastMembersUpdate,
+		Tags:      make(nostr.Tags, 1, 1+len(group.Members)),
+	}
+	evt.Tags[0] = nostr.Tag{"d", group.ID}
+
+	for member := range group.Members {
+		// include both admins and normal members
+		evt.Tags = append(evt.Tags, nostr.Tag{"p", member})
+	}
+
+	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)
@@ -84,3 +127,53 @@ func (group *Group) MergeInMetadataEvent(evt *nostr.Event) error {
 
 	return nil
 }
+
+func (group *Group) MergeInAdminsEvent(evt *nostr.Event) error {
+	if evt.Kind != nostr.KindSimpleGroupAdmins {
+		return fmt.Errorf("expected kind %d, got %d", nostr.KindSimpleGroupAdmins, evt.Kind)
+	}
+
+	if evt.CreatedAt <= group.LastAdminsUpdate {
+		return fmt.Errorf("event is older than our last update (%d vs %d)", evt.CreatedAt, group.LastAdminsUpdate)
+	}
+
+	group.LastAdminsUpdate = evt.CreatedAt
+	for _, tag := range evt.Tags {
+		if len(tag) < 3 {
+			continue
+		}
+		if tag[0] != "p" {
+			continue
+		}
+		if !nostr.IsValidPublicKeyHex(tag[1]) {
+			continue
+		}
+	}
+
+	return nil
+}
+
+func (group *Group) MergeInMembersEvent(evt *nostr.Event) error {
+	if evt.Kind != nostr.KindSimpleGroupMembers {
+		return fmt.Errorf("expected kind %d, got %d", nostr.KindSimpleGroupMembers, evt.Kind)
+	}
+
+	if evt.CreatedAt <= group.LastMembersUpdate {
+		return fmt.Errorf("event is older than our last update (%d vs %d)", evt.CreatedAt, group.LastMembersUpdate)
+	}
+
+	group.LastMembersUpdate = evt.CreatedAt
+	for _, tag := range evt.Tags {
+		if len(tag) < 2 {
+			continue
+		}
+		if tag[0] != "p" {
+			continue
+		}
+		if !nostr.IsValidPublicKeyHex(tag[1]) {
+			continue
+		}
+	}
+
+	return nil
+}