From 47b33828bc32c2ed61dc6d4adecd28a56aba025c Mon Sep 17 00:00:00 2001
From: Tibo-lg <thibaut@cryptogarage.co.jp>
Date: Mon, 9 Nov 2020 09:19:14 +0900
Subject: [PATCH] Add serde macros for public keys

---
 src/key.rs    | 66 +--------------------------------------------
 src/macros.rs | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 65 deletions(-)

diff --git a/src/key.rs b/src/key.rs
index 8d65185..cf72e64 100644
--- a/src/key.rs
+++ b/src/key.rs
@@ -404,71 +404,7 @@ impl From<ffi::PublicKey> for PublicKey {
     }
 }
 
-#[cfg(feature = "serde")]
-impl ::serde::Serialize for PublicKey {
-    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 PublicKey {
-    fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<PublicKey, D::Error> {
-        if d.is_human_readable() {
-            struct HexVisitor;
-
-            impl<'de> ::serde::de::Visitor<'de> for HexVisitor {
-                type Value = PublicKey;
-
-                fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-                    formatter.write_str("an ASCII hex string")
-                }
-
-                fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
-                where
-                    E: ::serde::de::Error,
-                {
-                    if let Ok(hex) = str::from_utf8(v) {
-                        str::FromStr::from_str(hex).map_err(E::custom)
-                    } else {
-                        Err(E::invalid_value(::serde::de::Unexpected::Bytes(v), &self))
-                    }
-                }
-
-                fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-                where
-                    E: ::serde::de::Error,
-                {
-                    str::FromStr::from_str(v).map_err(E::custom)
-                }
-            }
-            d.deserialize_str(HexVisitor)
-        } else {
-            struct BytesVisitor;
-
-            impl<'de> ::serde::de::Visitor<'de> for BytesVisitor {
-                type Value = PublicKey;
-
-                fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-                    formatter.write_str("a bytestring")
-                }
-
-                fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
-                where
-                    E: ::serde::de::Error,
-                {
-                    PublicKey::from_slice(v).map_err(E::custom)
-                }
-            }
-
-            d.deserialize_bytes(BytesVisitor)
-        }
-    }
-}
+serde_impl_from_slice!(PublicKey);
 
 #[cfg(test)]
 mod test {
diff --git a/src/macros.rs b/src/macros.rs
index 9cf9ba6..cafe960 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -87,3 +87,77 @@ macro_rules! serde_impl(
 macro_rules! serde_impl(
     ($t:ident, $len:expr) => ()
 );
+
+#[cfg(feature = "serde")]
+macro_rules! serde_impl_from_slice {
+    ($t: ident) => {
+        impl ::serde::Serialize for $t {
+            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())
+                }
+            }
+        }
+
+        impl<'de> ::serde::Deserialize<'de> for $t {
+            fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<$t, D::Error> {
+                if d.is_human_readable() {
+                    struct HexVisitor;
+
+                    impl<'de> ::serde::de::Visitor<'de> for HexVisitor {
+                        type Value = $t;
+
+                        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                            formatter.write_str("an ASCII hex string")
+                        }
+
+                        fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+                        where
+                            E: ::serde::de::Error,
+                        {
+                            if let Ok(hex) = str::from_utf8(v) {
+                                str::FromStr::from_str(hex).map_err(E::custom)
+                            } else {
+                                Err(E::invalid_value(::serde::de::Unexpected::Bytes(v), &self))
+                            }
+                        }
+
+                        fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+                        where
+                            E: ::serde::de::Error,
+                        {
+                            str::FromStr::from_str(v).map_err(E::custom)
+                        }
+                    }
+                    d.deserialize_str(HexVisitor)
+                } else {
+                    struct BytesVisitor;
+
+                    impl<'de> ::serde::de::Visitor<'de> for BytesVisitor {
+                        type Value = $t;
+
+                        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                            formatter.write_str("a bytestring")
+                        }
+
+                        fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+                        where
+                            E: ::serde::de::Error,
+                        {
+                            $t::from_slice(v).map_err(E::custom)
+                        }
+                    }
+
+                    d.deserialize_bytes(BytesVisitor)
+                }
+            }
+        }
+    };
+}
+
+#[cfg(not(feature = "serde"))]
+macro_rules! serde_impl_from_slice(
+    ($t:ident) => ()
+);