1 files changed, 25 insertions, 0 deletions
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index c709bbd..67d6e08 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -1,5 +1,6 @@
 import type { NDKEvent } from "@nostr-dev-kit/ndk";
 import { nip19 } from "nostr-tools";
+
 export function neventEncode(event: NDKEvent, relays: string[]) {
   return nip19.neventEncode({
     id: event.id,
@@ -81,3 +82,27 @@ export function isElementInViewport(el: string | HTMLElement) {
     rect.right <= (window.innerWidth || document.documentElement.clientWidth)
   );
 }
+
+/**
+ * Removes `kind: 30040` index events that don't comply with the NKBIP-01 specification.
+ * @param events A set of events.
+ * @returns The filtered set of events.
+ */
+export function filterValidIndexEvents(events: Set<NDKEvent>): Set<NDKEvent> {
+  // The filter object supports only limited parameters, so we need to filter out events that
+  // don't respect NKBIP-01.
+  events.forEach(event => {
+    // Index events have no content, and they must have `title`, `d`, and `e` tags.
+    if (
+      event.content != null
+      || event.getMatchingTags('title').length === 0
+      || event.getMatchingTags('d').length === 0
+      || event.getMatchingTags('e').length === 0
+    ) {
+      events.delete(event);
+    }
+  });
+
+  console.debug(`Filtered index events: ${events.size} events remaining.`);
+  return events;
+}