From 840324666bc64f3eefbe6d92568abe24ccaae14f Mon Sep 17 00:00:00 2001
From: reya <reya@lume.nu>
Date: Sat, 9 Nov 2024 13:47:01 +0700
Subject: [PATCH] feat: support tag standard for q tag

---
 .../src/protocol/event/tag/standard.rs        | 24 +++++++++++++++
 crates/nostr/src/event/tag/kind.rs            |  8 +++++
 crates/nostr/src/event/tag/standard.rs        | 29 +++++++++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/bindings/nostr-sdk-ffi/src/protocol/event/tag/standard.rs b/bindings/nostr-sdk-ffi/src/protocol/event/tag/standard.rs
index 79fa27a0d..abce1cc7b 100644
--- a/bindings/nostr-sdk-ffi/src/protocol/event/tag/standard.rs
+++ b/bindings/nostr-sdk-ffi/src/protocol/event/tag/standard.rs
@@ -40,6 +40,12 @@ pub enum TagStandard {
         /// Whether the e tag is an uppercase E or not
         uppercase: bool,
     },
+    Quote {
+        event_id: Arc<EventId>,
+        relay_url: Option<String>,
+        /// Should be the public key of the author of the referenced event
+        public_key: Option<Arc<PublicKey>>,
+    },
     /// Git clone (`clone` tag)
     ///
     /// <https://github.com/nostr-protocol/nips/blob/master/34.md>
@@ -295,6 +301,15 @@ impl From<tag::TagStandard> for TagStandard {
                 public_key: public_key.map(|p| Arc::new(p.into())),
                 uppercase,
             },
+            tag::TagStandard::Quote {
+                event_id,
+                relay_url,
+                public_key,
+            } => Self::Quote {
+                event_id: Arc::new(event_id.into()),
+                relay_url: relay_url.map(|u| u.to_string()),
+                public_key: public_key.map(|p| Arc::new(p.into())),
+            },
             tag::TagStandard::GitClone(urls) => Self::GitClone {
                 urls: urls.into_iter().map(|r| r.to_string()).collect(),
             },
@@ -502,6 +517,15 @@ impl TryFrom<TagStandard> for tag::TagStandard {
                 public_key: public_key.map(|p| **p),
                 uppercase,
             }),
+            TagStandard::Quote {
+                event_id,
+                relay_url,
+                public_key,
+            } => Ok(Self::Quote {
+                event_id: **event_id,
+                relay_url: relay_url.map(UncheckedUrl::from),
+                public_key: public_key.map(|p| **p),
+            }),
             TagStandard::GitClone { urls } => {
                 let mut parsed_urls: Vec<Url> = Vec::with_capacity(urls.len());
                 for url in urls.into_iter() {
diff --git a/crates/nostr/src/event/tag/kind.rs b/crates/nostr/src/event/tag/kind.rs
index 9ae9c453a..5f656d800 100644
--- a/crates/nostr/src/event/tag/kind.rs
+++ b/crates/nostr/src/event/tag/kind.rs
@@ -166,6 +166,14 @@ impl<'a> TagKind<'a> {
         Self::SingleLetter(SingleLetterTag::lowercase(Alphabet::T))
     }
 
+    /// Construct `q` kind
+    ///
+    /// Shorthand for `TagKind::SingleLetter(SingleLetterTag::lowercase(Alphabet::Q))`.
+    #[inline]
+    pub fn q() -> Self {
+        Self::SingleLetter(SingleLetterTag::lowercase(Alphabet::Q))
+    }
+
     /// Construct [`TagKind::Custom`]
     ///
     /// Shorthand for `TagKind::Custom(Cow::from(...))`.
diff --git a/crates/nostr/src/event/tag/standard.rs b/crates/nostr/src/event/tag/standard.rs
index 60abdb776..802bf6182 100644
--- a/crates/nostr/src/event/tag/standard.rs
+++ b/crates/nostr/src/event/tag/standard.rs
@@ -47,6 +47,15 @@ pub enum TagStandard {
         /// Whether the e tag is an uppercase E or not
         uppercase: bool,
     },
+    /// Quote
+    ///
+    /// <https://github.com/nostr-protocol/nips/blob/master/18.md>
+    Quote {
+        event_id: EventId,
+        relay_url: Option<UncheckedUrl>,
+        /// Should be the public key of the author of the referenced event
+        public_key: Option<PublicKey>,
+    },
     /// Report event
     ///
     /// <https://github.com/nostr-protocol/nips/blob/master/56.md>
@@ -468,6 +477,10 @@ impl TagStandard {
                 character: Alphabet::E,
                 uppercase: *uppercase,
             }),
+            Self::Quote { .. } => TagKind::SingleLetter(SingleLetterTag {
+                character: Alphabet::E,
+                uppercase: false,
+            }),
             Self::EventReport(..) => TagKind::SingleLetter(SingleLetterTag::lowercase(Alphabet::E)),
             Self::GitClone(..) => TagKind::Clone,
             Self::GitCommit(..) => TagKind::Commit,
@@ -617,6 +630,22 @@ impl From<TagStandard> for Vec<String> {
                 }
                 tag
             }
+            TagStandard::Quote {
+                event_id,
+                relay_url,
+                public_key,
+                ..
+            } => {
+                let mut tag = vec![tag_kind, event_id.to_hex()];
+                if let Some(relay_url) = relay_url {
+                    tag.push(relay_url.to_string());
+                }
+                if let Some(public_key) = public_key {
+                    tag.resize_with(3, String::new);
+                    tag.push(public_key.to_string());
+                }
+                tag
+            }
             TagStandard::PublicKey {
                 public_key,
                 relay_url,