enostr: rename Event to Note

we will likely replace Note with nostrdb::Note in the future,
this just helps with that transition

Signed-off-by: William Casarin <jb55@jb55.com>

enostr/src/note.rs

@@ -1,3 +1,8 @@
+use crate::{Error, Pubkey};
+
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
+use std::hash::{Hash, Hasher};
+
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
 pub struct NoteId([u8; 32]);
 
@@ -9,4 +14,109 @@ impl NoteId {
     pub fn bytes(&self) -> &[u8; 32] {
         &self.0
     }
+
+    pub fn hex(&self) -> String {
+        hex::encode(self.bytes())
+    }
+
+    pub fn from_hex(hex_str: &str) -> Result<Self, Error> {
+        let evid = NoteId(hex::decode(hex_str)?.as_slice().try_into().unwrap());
+        Ok(evid)
+    }
+}
+
+/// Event is the struct used to represent a Nostr event
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct Note {
+    /// 32-bytes sha256 of the the serialized event data
+    pub id: NoteId,
+    /// 32-bytes hex-encoded public key of the event creator
+    pub pubkey: Pubkey,
+    /// unix timestamp in seconds
+    pub created_at: u64,
+    /// integer
+    /// 0: NostrEvent
+    pub kind: u64,
+    /// Tags
+    pub tags: Vec<Vec<String>>,
+    /// arbitrary string
+    pub content: String,
+    /// 64-bytes signature of the sha256 hash of the serialized event data, which is the same as the "id" field
+    pub sig: String,
+}
+
+// Implement Hash trait
+impl Hash for Note {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.id.0.hash(state);
+    }
+}
+
+impl PartialEq for Note {
+    fn eq(&self, other: &Self) -> bool {
+        self.id == other.id
+    }
+}
+
+impl Eq for Note {}
+
+impl Note {
+    pub fn from_json(s: &str) -> Result<Self, Error> {
+        serde_json::from_str(s).map_err(Into::into)
+    }
+
+    pub fn verify(&self) -> Result<Self, Error> {
+        return Err(Error::InvalidSignature);
+    }
+
+    /// This is just for serde sanity checking
+    #[allow(dead_code)]
+    pub(crate) fn new_dummy(
+        id: &str,
+        pubkey: &str,
+        created_at: u64,
+        kind: u64,
+        tags: Vec<Vec<String>>,
+        content: &str,
+        sig: &str,
+    ) -> Result<Self, Error> {
+        Ok(Note {
+            id: NoteId::from_hex(id)?,
+            pubkey: Pubkey::from_hex(pubkey)?,
+            created_at,
+            kind,
+            tags,
+            content: content.to_string(),
+            sig: sig.to_string(),
+        })
+    }
+}
+
+impl std::str::FromStr for Note {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Error> {
+        Note::from_json(s)
+    }
+}
+
+// Custom serialize function for Pubkey
+impl Serialize for NoteId {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(&self.hex())
+    }
+}
+
+// Custom deserialize function for Pubkey
+impl<'de> Deserialize<'de> for NoteId {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        NoteId::from_hex(&s).map_err(serde::de::Error::custom)
+    }
 }