feat(common): add serde to Timestamp

pubky-common/Cargo.toml

@@ -14,8 +14,19 @@ pkarr = "2.1.0"
 rand = "0.8.5"
 thiserror = "1.0.60"
 postcard = { version = "1.0.8", features = ["alloc"] }
-serde = { version = "1.0.204", features = ["derive"] }
 crypto_secretbox = { version = "0.1.1", features = ["std"] }
 
+serde = { version = "1.0.204", features = ["derive"], optional = true }
+
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 js-sys = "0.3.69"
+
+[dev-dependencies]
+postcard = "1.0.8"
+
+[features]
+
+serde = ["dep:serde", "ed25519-dalek/serde"]
+full = ['serde']
+
+default = ['full']

pubky-common/src/timestamp.rs

@@ -1,5 +1,6 @@
 //! Monotonic unix timestamp in microseconds
 
+use serde::{Deserialize, Serialize};
 use std::fmt::Display;
 use std::{
     ops::{Add, Sub},
@@ -83,6 +84,12 @@ impl Timestamp {
     }
 }
 
+impl Default for Timestamp {
+    fn default() -> Self {
+        Timestamp::now()
+    }
+}
+
 impl Display for Timestamp {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let bytes: [u8; 8] = self.into();
@@ -155,6 +162,26 @@ impl Sub<u64> for &Timestamp {
     }
 }
 
+impl Serialize for Timestamp {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let bytes = self.to_bytes();
+        bytes.serialize(serializer)
+    }
+}
+
+impl<'de> Deserialize<'de> for Timestamp {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let bytes: [u8; 8] = Deserialize::deserialize(deserializer)?;
+        Ok(Timestamp(u64::from_be_bytes(bytes)))
+    }
+}
+
 #[cfg(not(target_arch = "wasm32"))]
 /// Return the number of microseconds since [SystemTime::UNIX_EPOCH]
 fn system_time() -> u64 {
@@ -237,4 +264,17 @@ mod tests {
 
         assert_eq!(decoded, timestamp)
     }
+
+    #[test]
+    fn serde() {
+        let timestamp = Timestamp::now();
+
+        let serialized = postcard::to_allocvec(&timestamp).unwrap();
+
+        assert_eq!(serialized, timestamp.to_bytes());
+
+        let deserialized: Timestamp = postcard::from_bytes(&serialized).unwrap();
+
+        assert_eq!(deserialized, timestamp);
+    }
 }