fix: contract creation on trezor (#695)

* fix contract creation on trezor

* handle when _to_ param is an empty string

* return TrezorError when receiving an ENS name

* fix typo

ethers-signers/src/trezor/app.rs

@@ -264,13 +264,34 @@ mod tests {
     #[tokio::test]
     #[ignore]
     async fn test_sign_empty_txes() {
+        // Contract creation (empty `to`), requires data.
+        // To test without the data field, we need to specify a `to` address.
         let trezor = TrezorEthereum::new(DerivationType::TrezorLive(0), 1).await.unwrap();
         {
-            let tx_req = Eip1559TransactionRequest::new().into();
+            let tx_req = Eip1559TransactionRequest::new()
+                .to("2ed7afa17473e17ac59908f088b4371d28585476".parse::<Address>().unwrap())
+                .into();
             let tx = trezor.sign_transaction(&tx_req).await.unwrap();
         }
         {
-            let tx_req = TransactionRequest::new().into();
+            let tx_req = TransactionRequest::new()
+                .to("2ed7afa17473e17ac59908f088b4371d28585476".parse::<Address>().unwrap())
+                .into();
+            let tx = trezor.sign_transaction(&tx_req).await.unwrap();
+        }
+
+        let data = hex::decode("095ea7b30000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap();
+
+        // Contract creation (empty `to`, with data) should show on the trezor device as:
+        //  ` "0 Wei ETH
+        //  ` new contract?"
+        let trezor = TrezorEthereum::new(DerivationType::TrezorLive(0), 1).await.unwrap();
+        {
+            let tx_req = Eip1559TransactionRequest::new().data(data.clone()).into();
+            let tx = trezor.sign_transaction(&tx_req).await.unwrap();
+        }
+        {
+            let tx_req = TransactionRequest::new().data(data.clone()).into();
             let tx = trezor.sign_transaction(&tx_req).await.unwrap();
         }
     }

ethers-signers/src/trezor/types.rs

@@ -4,7 +4,7 @@
 use std::fmt;
 use thiserror::Error;
 
-use ethers_core::types::{transaction::eip2718::TypedTransaction, NameOrAddress, H160, U256};
+use ethers_core::types::{transaction::eip2718::TypedTransaction, NameOrAddress, U256};
 use trezor_client::client::AccessListItem as Trezor_AccessListItem;
 
 #[derive(Clone, Debug)]
@@ -49,6 +49,8 @@ pub enum TrezorError {
     /// Error when signing EIP712 struct with not compatible Trezor ETH app
     #[error("Trezor ethereum app requires at least version: {0:?}")]
     UnsupportedFirmwareVersion(String),
+    #[error("Does not support ENS.")]
+    NoENSSupport,
 }
 
 /// Trezor Transaction Struct
@@ -72,9 +74,13 @@ impl TrezorTransaction {
     }
 
     pub fn load(tx: &TypedTransaction) -> Result<Self, TrezorError> {
-        let to: String = match tx.to().unwrap_or(&NameOrAddress::Address(H160::from(&[0; 20]))) {
-            NameOrAddress::Name(_) => unimplemented!(),
-            NameOrAddress::Address(value) => format!("0x{}", hex::encode(value)),
+        let to: String = match tx.to() {
+            Some(v) => match v {
+                NameOrAddress::Name(_) => return Err(TrezorError::NoENSSupport),
+                NameOrAddress::Address(value) => format!("0x{}", hex::encode(value)),
+            },
+            // Contract Creation
+            None => "".to_string(),
         };
 
         let nonce = tx.nonce().map_or(vec![], Self::to_trimmed_big_endian);