From f15f530a1f8a95a74d249a5b88c538d3b2229842 Mon Sep 17 00:00:00 2001
From: Yuki Kishimoto <yukikishimoto@protonmail.com>
Date: Tue, 17 Oct 2023 15:12:02 +0200
Subject: [PATCH] nostr: add `identifier` method to `Event`

---
 crates/nostr/src/event/mod.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/crates/nostr/src/event/mod.rs b/crates/nostr/src/event/mod.rs
index bbd27146a..8dbc378ee 100644
--- a/crates/nostr/src/event/mod.rs
+++ b/crates/nostr/src/event/mod.rs
@@ -223,6 +223,16 @@ impl Event {
     pub fn is_parameterized_replaceable(&self) -> bool {
         self.kind.is_parameterized_replaceable()
     }
+
+    /// Extract identifier (`d` tag), if exists.
+    pub fn identifier(&self) -> Option<&str> {
+        for tag in self.tags.iter() {
+            if let Tag::Identifier(id) = tag {
+                return Some(id);
+            }
+        }
+        None
+    }
 }
 
 impl JsonUtil for Event {