From 3bbeb113a78b36bfd76ab5fd7e534d45400edd98 Mon Sep 17 00:00:00 2001
From: Danny Morabito <danny@arx-ccn.com>
Date: Tue, 26 Nov 2024 21:21:32 +0100
Subject: [PATCH] add utilities to convert nostr npubs to and from hex strings

---
 src/nostr.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/nostr.ts b/src/nostr.ts
index 4b4cd80..af68454 100644
--- a/src/nostr.ts
+++ b/src/nostr.ts
@@ -1,6 +1,7 @@
 import NDK, {NDKEvent, NDKPrivateKeySigner, NDKUser} from "@nostr-dev-kit/ndk";
 import {generateSecretKey} from "nostr-tools";
 import {randomTimeUpTo2DaysInThePast} from "./general.ts";
+import {decode as nip19Decode, npubEncode} from "nostr-tools/nip19";
 
 export async function encryptEventForRecipient(
   ndk: NDK,
@@ -25,3 +26,14 @@ export async function encryptEventForRecipient(
   giftWrap.ndk = ndk;
   return giftWrap;
 }
+
+export function npubToPubKeyString(npub: string) {
+  const decoded = nip19Decode(npub);
+  if (decoded.type !== 'npub')
+    throw new Error('Invalid npub');
+  return decoded.data;
+}
+
+export function pubKeyStringToNpub(pubKey: string) {
+  return npubEncode(pubKey);
+}