From 0816e89b32e7149ea51e49957595e3c9d031ce98 Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Fri, 25 Jul 2025 09:50:00 -0300
Subject: [PATCH] nip65 helpers.

---
 nip65/nip65.go | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 nip65/nip65.go

diff --git a/nip65/nip65.go b/nip65/nip65.go
new file mode 100644
index 0000000..bc8c447
--- /dev/null
+++ b/nip65/nip65.go
@@ -0,0 +1,34 @@
+package nip65
+
+import "fiatjaf.com/nostr"
+
+// ParseRelayList parses a NIP-65 relay list event (kind 10002) and returns
+// separate lists of read and write relays based on the "r" tags.
+func ParseRelayList(event nostr.Event) (readRelays []string, writeRelays []string) {
+	for tag := range event.Tags.FindAll("r") {
+		if len(tag) < 2 {
+			continue
+		}
+
+		relayURL := tag[1]
+		if !nostr.IsValidRelayURL(relayURL) {
+			continue
+		}
+
+		normalizedURL := nostr.NormalizeURL(relayURL)
+		var marker string
+		if len(tag) > 2 {
+			marker = tag[2]
+		}
+
+		if marker == "" || marker == "read" {
+			readRelays = append(readRelays, normalizedURL)
+		}
+		if marker == "" || marker == "write" {
+			writeRelays = append(writeRelays, normalizedURL)
+		}
+	}
+
+	return readRelays, writeRelays
+}
+