feat(trust): trust-gated invites, open-request claim opportunity, claim-author rule (#27)

nestlog.go

@@ -119,6 +119,18 @@ func (s *MessageStore) ByMsgID(msgID string) (Message, bool) {
 	return Message{}, false
 }
 
+// Answered reports whether crow has claimed, delivered or declined the referent.
+func (s *MessageStore) Answered(nestID, referentID, crow string) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, m := range s.log[nestID] {
+		if m.Author == crow && m.RefersTo == referentID && responsiveKind[m.Kind] {
+			return true
+		}
+	}
+	return false
+}
+
 // FirstClaim returns the author of the first claim against a message, and
 // whether any claim exists.
 func (s *MessageStore) FirstClaim(nestID, referentID string) (string, bool) {