feat: add support for custom emojis (NIP-30) (#63)

Reviewed-on: #63
2026-10-11 13:22:53 +00:00
parent b4ce9368e2
commit 291471075b
16 changed files with 493 additions and 63 deletions
@@ -51,3 +51,53 @@ impl EventExt for UnsignedEvent {
        public_keys.into_iter().unique().sorted().collect()
    }
 }
+
+/// Custom emoji (NIP-30) declared by `emoji` tags, first per shortcode wins
+pub fn emojis_from_tags(tags: &Tags) -> Vec<(String, Url)> {
+    let mut emojis: Vec<(String, Url)> = Vec::new();
+
+    for tag in tags.iter() {
+        let Ok(Nip30Tag::Emoji {
+            shortcode,
+            image_url,
+            ..
+        }) = Nip30Tag::try_from(tag)
+        else {
+            continue;
+        };
+
+        if !emojis.iter().any(|(existing, _)| *existing == shortcode) {
+            emojis.push((shortcode, image_url));
+        }
+    }
+
+    emojis
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn emojis_from_tags_parses_and_deduplicates() {
+        let tags = Tags::from_list(vec![
+            Tag::parse(vec!["emoji", "soapbox", "https://example.com/soapbox.png"]).unwrap(),
+            Tag::parse(vec!["emoji", "soapbox", "https://example.com/other.png"]).unwrap(),
+            Tag::parse(vec![
+                "emoji",
+                "bad shortcode",
+                "https://example.com/bad.png",
+            ])
+            .unwrap(),
+        ]);
+
+        let emojis = emojis_from_tags(&tags);
+
+        assert_eq!(emojis.len(), 1);
+        assert_eq!(emojis[0].0, "soapbox");
+        assert_eq!(
+            emojis[0].1,
+            Url::parse("https://example.com/soapbox.png").unwrap()
+        );
+    }
+}