nip65 helpers.

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
+}
+