From 705e5ce9a821e76769e9fe58040cb262ce84e18c Mon Sep 17 00:00:00 2001
From: andrea <andrea@iflabs.network>
Date: Thu, 14 Nov 2024 15:05:59 -0800
Subject: [PATCH] WASM: expose the `Transaction` type

---
 ironfish-rust-wasm/src/transaction/mod.rs | 166 ++++++++++++++++++++++
 1 file changed, 166 insertions(+)

diff --git a/ironfish-rust-wasm/src/transaction/mod.rs b/ironfish-rust-wasm/src/transaction/mod.rs
index 3d0fd2a72d..18d2d0b65a 100644
--- a/ironfish-rust-wasm/src/transaction/mod.rs
+++ b/ironfish-rust-wasm/src/transaction/mod.rs
@@ -7,7 +7,173 @@ mod mints;
 mod outputs;
 mod spends;
 
+use crate::{errors::IronfishError, primitives::PublicKey};
+use wasm_bindgen::prelude::*;
+
 pub use burns::BurnDescription;
 pub use mints::MintDescription;
 pub use outputs::OutputDescription;
 pub use spends::SpendDescription;
+
+#[wasm_bindgen]
+#[derive(Clone, Debug)]
+pub struct Transaction(ironfish::Transaction);
+
+#[wasm_bindgen]
+impl Transaction {
+    #[wasm_bindgen(constructor)]
+    pub fn deserialize(bytes: &[u8]) -> Result<Transaction, IronfishError> {
+        Ok(Self(ironfish::Transaction::read(bytes)?))
+    }
+
+    #[wasm_bindgen]
+    pub fn serialize(&self) -> Vec<u8> {
+        let mut buf = Vec::new();
+        self.0
+            .write(&mut buf)
+            .expect("failed to serialize transaction");
+        buf
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn fee(&self) -> i64 {
+        self.0.fee()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn expiration(&self) -> u32 {
+        self.0.expiration()
+    }
+
+    #[wasm_bindgen(getter, js_name = randomizedPublicKey)]
+    pub fn randomized_public_key(&self) -> PublicKey {
+        self.0.randomized_public_key().clone().into()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn spends(&self) -> Vec<SpendDescription> {
+        self.0
+            .spends()
+            .iter()
+            .cloned()
+            .map(SpendDescription::from)
+            .collect()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn outputs(&self) -> Vec<OutputDescription> {
+        self.0
+            .outputs()
+            .iter()
+            .cloned()
+            .map(OutputDescription::from)
+            .collect()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn mints(&self) -> Vec<MintDescription> {
+        self.0
+            .mints()
+            .iter()
+            .cloned()
+            .map(MintDescription::from)
+            .collect()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn burns(&self) -> Vec<BurnDescription> {
+        self.0
+            .burns()
+            .iter()
+            .cloned()
+            .map(BurnDescription::from)
+            .collect()
+    }
+
+    #[wasm_bindgen(js_name = transactionSignatureHash)]
+    pub fn transaction_signature_hash(&self) -> Result<Vec<u8>, IronfishError> {
+        self.0
+            .transaction_signature_hash()
+            .map(|hash| hash.to_vec())
+            .map_err(|err| err.into())
+    }
+}
+
+impl From<ironfish::Transaction> for Transaction {
+    fn from(t: ironfish::Transaction) -> Self {
+        Self(t)
+    }
+}
+
+impl AsRef<ironfish::Transaction> for Transaction {
+    fn as_ref(&self) -> &ironfish::Transaction {
+        &self.0
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Transaction;
+    use hex_literal::hex;
+    use wasm_bindgen_test::wasm_bindgen_test;
+
+    // Transaction copied from one of the fixtures in the `ironfish` NodeJS package
+    const TEST_TRANSACTION_BYTES: [u8; 661] = hex!(
+        "010000000000000000010000000000000000000000000000000000000000000000006cca88ffffffff00000000\
+        5e0c3088ca0767097b456c190416cc9ec82a296d5500876ce394218cde263c3e987762affaec55596ab06f7d7f4\
+        6dd949762f7705fc4978e64842242c59ff99e4dab95eaa46384f3e2e2705732db4d458bb3146e28620273558cc6\
+        e31d2c4f5127d0e787468e5a56ca0d0a30b0434e22b2438e9d026f63be9dac46500671cb67197dd654f3e8fe68a\
+        e3abca0fcc50009a89751a2f179c7470888f8a107492606cd30103a72870af2f87adf8210a2cb3d8d73f1150d99\
+        e0dfbbb9daaba03e7daf24e26dd468b572b3dded502311ab83c17b87eb3db1a1bb8f7a3c5af0d40035d11b15a3c\
+        e6f235138b2ef5f9853a01d61b9a9e549290618fbd697330380b9f0712e1d926b454b7a4cb7ddad47220bbaae68\
+        34ab67e0b42d6dd13b70d5ffb49c7067da8db3832b9f444990950bc25d7741a7ccb236b6a2eb346cfe8e02a34e6\
+        b2f2993889cd256f9eb4cd2eebdc2bfdb9805e60730c92581fa4fea090f7baafcb8bf18a233ab150764bb76285b\
+        22b0f16831b8a3f47b4d41e96ab00a30e86994b4fb7b5a49d3ef8d37cce7035e741d1eacf649356f61169b06490\
+        d702e34033d35f446864085f51315048de2e827746928492ef8cdec5c4faadf5bc82877462291118b643f44da99\
+        e82335717cf1da9f149cc556100c4bd76c49726f6e2046697368206e6f746520656e6372797074696f6e206d696\
+        e6572206b6579303030303030303030303030303030303030303030303030303030303030303030303030303030\
+        303030303030be04297828e5177a3ac901e89a7224a7e8f760a4377fc46b46384f3ef90a0c38e95fa386d2306f9\
+        8aeddeb6532ef022fb13e3b695d6df812587cd5eda684e502"
+    );
+
+    #[test]
+    #[wasm_bindgen_test]
+    fn deserialize() {
+        let tx = Transaction::deserialize(TEST_TRANSACTION_BYTES.as_slice())
+            .expect("reading transaction should have succeeded");
+
+        assert_eq!(tx.fee(), -2_000_000_000);
+        assert_eq!(tx.expiration(), 0);
+        assert_eq!(
+            tx.randomized_public_key().serialize(),
+            hex!("5e0c3088ca0767097b456c190416cc9ec82a296d5500876ce394218cde263c3e")
+        );
+
+        assert_eq!(tx.spends().len(), 0);
+        assert_eq!(tx.outputs().len(), 1);
+        assert_eq!(tx.mints().len(), 0);
+        assert_eq!(tx.burns().len(), 0);
+
+        let [output] = &tx.outputs()[..] else {
+            panic!("expected exactly one output")
+        };
+        output
+            .partial_verify()
+            .expect("output verification should have succeeded");
+        assert_eq!(
+            output.merkle_note().merkle_hash().serialize(),
+            hex!("2e1d926b454b7a4cb7ddad47220bbaae6834ab67e0b42d6dd13b70d5ffb49c70")
+        );
+
+        assert_eq!(
+            tx.transaction_signature_hash().unwrap(),
+            hex!("2ab1daec6bbb764e4247d3d82f1aa6da9eb71b98ac9e0dfc61e1d8aec487c9d2")
+        );
+    }
+
+    #[test]
+    #[wasm_bindgen_test]
+    fn deserialize_failure() {
+        Transaction::deserialize(b"abc").expect_err("reading transaction should have failed");
+    }
+}