support add/read multiple arbitrary tx data (#189)

* support add/read multiple arbitrary tx  data

* fix clippy errors

* resolve pr issues

coins/monero/src/wallet/extra.rs

@@ -10,6 +10,8 @@ use crate::serialize::{
   write_point, write_vec,
 };
 
+pub const MAX_TX_EXTRA_NONCE_SIZE: usize = 255;
+
 #[derive(Clone, Copy, PartialEq, Eq, Debug, Zeroize)]
 pub(crate) enum PaymentId {
   Unencrypted([u8; 32]),
@@ -91,7 +93,7 @@ impl ExtraField {
       1 => ExtraField::PublicKey(read_point(r)?),
       2 => ExtraField::Nonce({
         let nonce = read_vec(read_byte, r)?;
-        if nonce.len() > 255 {
+        if nonce.len() > MAX_TX_EXTRA_NONCE_SIZE {
           Err(io::Error::new(io::ErrorKind::Other, "too long nonce"))?;
         }
         nonce
@@ -131,8 +133,9 @@ impl Extra {
     None
   }
 
-  pub(crate) fn data(&self) -> Option<Vec<u8>> {
+  pub(crate) fn data(&self) -> Vec<Vec<u8>> {
     let mut first = true;
+    let mut res = vec![];
     for field in &self.0 {
       if let ExtraField::Nonce(data) = field {
         // Skip the first Nonce, which should be the payment ID
@@ -140,10 +143,10 @@ impl Extra {
           first = false;
           continue;
         }
-        return Some(data.clone());
+        res.push(data.clone());
       }
     }
-    None
+    res
   }
 
   pub(crate) fn new(mut keys: Vec<EdwardsPoint>) -> Extra {
@@ -162,15 +165,15 @@ impl Extra {
   }
 
   #[rustfmt::skip]
-  pub(crate) fn fee_weight(outputs: usize, data: Option<&Vec<u8>>) -> usize {
+  pub(crate) fn fee_weight(outputs: usize, data: &[Vec<u8>]) -> usize {
     // PublicKey, key
     (1 + 32) +
     // PublicKeys, length, additional keys
     (1 + 1 + (outputs.saturating_sub(1) * 32)) +
     // PaymentId (Nonce), length, encrypted, ID
     (1 + 1 + 1 + 8) +
-    // Nonce, length, data (if existant)
-    data.map(|v| 1 + varint_len(v.len()) + v.len()).unwrap_or(0)
+    // Nonce, length, data (if existent)
+    data.iter().map(|v| 1 + varint_len(v.len()) + v.len()).sum::<usize>()
   }
 
   pub(crate) fn serialize<W: Write>(&self, w: &mut W) -> io::Result<()> {

coins/monero/src/wallet/scan.rs

@@ -73,7 +73,7 @@ pub struct Metadata {
   // have this making it simplest for it to be as-is.
   pub payment_id: [u8; 8],
   /// Arbitrary data encoded in TX extra.
-  pub arbitrary_data: Option<Vec<u8>>,
+  pub arbitrary_data: Vec<Vec<u8>>,
 }
 
 impl Metadata {
@@ -82,11 +82,11 @@ impl Metadata {
     res.extend(self.subaddress.0.to_le_bytes());
     res.extend(self.subaddress.1.to_le_bytes());
     res.extend(self.payment_id);
-    if let Some(data) = self.arbitrary_data.as_ref() {
-      res.extend([1, u8::try_from(data.len()).unwrap()]);
-      res.extend(data);
-    } else {
-      res.extend([0]);
+
+    res.extend(u32::try_from(self.arbitrary_data.len()).unwrap().to_le_bytes());
+    for part in &self.arbitrary_data {
+      res.extend([u8::try_from(part.len()).unwrap()]);
+      res.extend(part);
     }
     res
   }
@@ -96,12 +96,12 @@ impl Metadata {
       subaddress: (read_u32(r)?, read_u32(r)?),
       payment_id: read_bytes(r)?,
       arbitrary_data: {
-        if read_byte(r)? == 1 {
+        let mut data = vec![];
+        for _ in 0 .. read_u32(r)? {
           let len = read_byte(r)?;
-          Some(read_raw_vec(read_byte, usize::from(len), r)?)
-        } else {
-          None
+          data.push(read_raw_vec(read_byte, usize::from(len), r)?);
         }
+        data
       },
     })
   }
@@ -128,6 +128,10 @@ impl ReceivedOutput {
     self.data.commitment.clone()
   }
 
+  pub fn arbitrary_data(&self) -> &[Vec<u8>] {
+    &self.metadata.arbitrary_data
+  }
+
   pub fn serialize(&self) -> Vec<u8> {
     let mut serialized = self.absolute.serialize();
     serialized.extend(&self.data.serialize());

coins/monero/src/wallet/send/builder.rs

@@ -4,7 +4,10 @@ use zeroize::{Zeroize, ZeroizeOnDrop};
 
 use crate::{
   Protocol,
-  wallet::{address::MoneroAddress, Fee, SpendableOutput, SignableTransaction, TransactionError},
+  wallet::{
+    address::MoneroAddress, Fee, SpendableOutput, SignableTransaction, TransactionError,
+    extra::MAX_TX_EXTRA_NONCE_SIZE,
+  },
 };
 
 #[derive(Clone, PartialEq, Eq, Debug, Zeroize, ZeroizeOnDrop)]
@@ -15,14 +18,14 @@ struct SignableTransactionBuilderInternal {
   inputs: Vec<SpendableOutput>,
   payments: Vec<(MoneroAddress, u64)>,
   change_address: Option<MoneroAddress>,
-  data: Option<Vec<u8>>,
+  data: Vec<Vec<u8>>,
 }
 
 impl SignableTransactionBuilderInternal {
   // Takes in the change address so users don't miss that they have to manually set one
   // If they don't, all leftover funds will become part of the fee
   fn new(protocol: Protocol, fee: Fee, change_address: Option<MoneroAddress>) -> Self {
-    Self { protocol, fee, inputs: vec![], payments: vec![], change_address, data: None }
+    Self { protocol, fee, inputs: vec![], payments: vec![], change_address, data: vec![] }
   }
 
   fn add_input(&mut self, input: SpendableOutput) {
@@ -39,8 +42,8 @@ impl SignableTransactionBuilderInternal {
     self.payments.extend(payments);
   }
 
-  fn set_data(&mut self, data: Vec<u8>) {
-    self.data = Some(data);
+  fn add_data(&mut self, data: Vec<u8>) {
+    self.data.push(data);
   }
 }
 
@@ -100,9 +103,12 @@ impl SignableTransactionBuilder {
     self.shallow_copy()
   }
 
-  pub fn set_data(&mut self, data: Vec<u8>) -> Self {
-    self.0.write().unwrap().set_data(data);
-    self.shallow_copy()
+  pub fn add_data(&mut self, data: Vec<u8>) -> Result<Self, TransactionError> {
+    if data.len() > MAX_TX_EXTRA_NONCE_SIZE {
+      Err(TransactionError::TooMuchData)?;
+    }
+    self.0.write().unwrap().add_data(data);
+    Ok(self.shallow_copy())
   }
 
   pub fn build(self) -> Result<SignableTransaction, TransactionError> {

coins/monero/src/wallet/send/mod.rs

@@ -24,7 +24,7 @@ use crate::{
   rpc::{Rpc, RpcError},
   wallet::{
     address::MoneroAddress, SpendableOutput, Decoys, PaymentId, ExtraField, Extra, key_image_sort,
-    uniqueness, shared_key, commitment_mask, amount_encryption,
+    uniqueness, shared_key, commitment_mask, amount_encryption, extra::MAX_TX_EXTRA_NONCE_SIZE,
   },
 };
 
@@ -177,7 +177,7 @@ pub struct SignableTransaction {
   protocol: Protocol,
   inputs: Vec<SpendableOutput>,
   payments: Vec<(MoneroAddress, u64)>,
-  data: Option<Vec<u8>>,
+  data: Vec<Vec<u8>>,
   fee: u64,
 }
 
@@ -191,7 +191,7 @@ impl SignableTransaction {
     inputs: Vec<SpendableOutput>,
     mut payments: Vec<(MoneroAddress, u64)>,
     change_address: Option<MoneroAddress>,
-    data: Option<Vec<u8>>,
+    data: Vec<Vec<u8>>,
     fee_rate: Fee,
   ) -> Result<SignableTransaction, TransactionError> {
     // Make sure there's only one payment ID
@@ -220,9 +220,11 @@ impl SignableTransaction {
       Err(TransactionError::NoOutputs)?;
     }
 
-    if data.as_ref().map(|v| v.len()).unwrap_or(0) > 255 {
+    for part in &data {
+      if part.len() > MAX_TX_EXTRA_NONCE_SIZE {
         Err(TransactionError::TooMuchData)?;
       }
+    }
 
     // TODO TX MAX SIZE
 
@@ -313,8 +315,8 @@ impl SignableTransaction {
       extra.push(ExtraField::Nonce(id_vec));
 
       // Include data if present
-      if let Some(data) = self.data.take() {
-        extra.push(ExtraField::Nonce(data));
+      for part in self.data.drain(..) {
+        extra.push(ExtraField::Nonce(part));
       }
 
       let mut serialized = Vec::with_capacity(Extra::fee_weight(outputs.len(), self.data.as_ref()));

coins/monero/tests/add_data.rs

@@ -0,0 +1,79 @@
+use monero_serai::{rpc::Rpc, wallet::TransactionError, transaction::Transaction};
+
+mod runner;
+
+test!(
+  add_single_data_less_than_255,
+  (
+    |_, mut builder: Builder, addr| async move {
+      // make a data that is less than 255 bytes
+      let arbitrary_data = Vec::from("this is an arbitrary data less than 255 bytes");
+
+      // make sure we can add to tx
+      let result = builder.add_data(arbitrary_data.clone());
+      assert!(result.is_ok());
+
+      builder.add_payment(addr, 5);
+      (builder.build().unwrap(), (arbitrary_data,))
+    },
+    |rpc: Rpc, signed: Transaction, mut scanner: Scanner, state: (Vec<u8>,)| async move {
+      let tx = rpc.get_transaction(signed.hash()).await.unwrap();
+      let output = scanner.scan_transaction(&tx).not_locked().swap_remove(0);
+      assert_eq!(output.commitment().amount, 5);
+      assert_eq!(output.arbitrary_data()[0], state.0);
+    },
+  ),
+);
+
+test!(
+  add_multiple_data_less_than_255,
+  (
+    |_, mut builder: Builder, addr| async move {
+      // make a data that is less than 255 bytes
+      let arbitrary_data = Vec::from("this is an arbitrary data less than 255 bytes");
+
+      // add tx multiple times
+      for _ in 0 .. 5 {
+        let result = builder.add_data(arbitrary_data.clone());
+        assert!(result.is_ok());
+      }
+
+      builder.add_payment(addr, 5);
+      (builder.build().unwrap(), (arbitrary_data,))
+    },
+    |rpc: Rpc, signed: Transaction, mut scanner: Scanner, state: (Vec<u8>,)| async move {
+      let tx = rpc.get_transaction(signed.hash()).await.unwrap();
+      let output = scanner.scan_transaction(&tx).not_locked().swap_remove(0);
+      assert_eq!(output.commitment().amount, 5);
+      let data = output.arbitrary_data();
+      for i in 0 .. 5 {
+        assert_eq!(data[i], state.0);
+      }
+    },
+  ),
+);
+
+test!(
+  add_single_data_more_than_255,
+  (
+    |_, mut builder: Builder, addr| async move {
+      // make a data that is bigger than 255 bytes
+      let mut arbitrary_data = vec![];
+      for _ in 0 .. 256 {
+        arbitrary_data.push(b'a');
+      }
+
+      // make sure we get an error if we try to add it to tx
+      let mut result = builder.add_payment(addr, 5).add_data(arbitrary_data.clone());
+      assert_eq!(result, Err(TransactionError::TooMuchData));
+
+      // reduce data size and re-try
+      arbitrary_data.swap_remove(0);
+      result = builder.add_data(arbitrary_data);
+
+      assert!(result.is_ok());
+      (builder.build().unwrap(), ())
+    },
+    |_, _, _, _| async move {},
+  ),
+);

processor/src/coin/monero.rs

@@ -178,7 +178,7 @@ impl Coin for Monero {
         inputs.drain(..).map(|input| input.0).collect(),
         payments.to_vec(),
         Some(self.address(spend)),
-        None,
+        vec![],
         fee,
       )
       .map_err(|_| CoinError::ConnectionError)?,
@@ -261,7 +261,7 @@ impl Coin for Monero {
       outputs,
       vec![(address, amount - fee)],
       Some(Self::empty_address()),
-      None,
+      vec![],
       self.rpc.get_fee().await.unwrap(),
     )
     .unwrap()