feat(silentpayments): implement serde::{Serialize,Deserialize} for Label

Author: nymius

src/silentpayments/recipient.rs

@@ -110,6 +110,39 @@ impl core::str::FromStr for Label {
         }
     }
 }
+
+#[cfg(feature = "serde")]
+impl serde::Serialize for Label {
+    fn serialize<S: serde::Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
+        if s.is_human_readable() {
+            s.collect_str(self)
+        } else {
+            s.serialize_bytes(&self.serialize()[..])
+        }
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<'de> serde::Deserialize<'de> for Label {
+    fn deserialize<D: serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
+        if d.is_human_readable() {
+            use crate::serde_util::FromStrVisitor;
+
+            d.deserialize_str(FromStrVisitor::new(
+                "a hex string representing a Silent Payment Label",
+            ))
+        } else {
+            use crate::serde_util::BytesVisitor;
+
+            d.deserialize_bytes(BytesVisitor::new("a raw Silent Payment Label", |slice| {
+                let bytes: &[u8; 33] = slice.try_into().map_err(|_| LabelError::ParseFailure)?;
+
+                Self::parse(bytes)
+            }))
+        }
+    }
+}
+
 /// Label errors.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, PartialOrd, Ord, Hash)]
 pub enum LabelError {