Fixing hash deserialisation (#1674)

rpc/src/v1/tests/mocked/eth.rs

@@ -608,6 +608,28 @@ fn rpc_eth_send_transaction() {
 
 	assert_eq!(tester.io.handle_request(&request), Some(response));
 }
+#[test]
+fn rpc_eth_send_transaction_with_bad_to() {
+	let tester = EthTester::default();
+	let address = tester.accounts_provider.new_account("").unwrap();
+	let request = r#"{
+		"jsonrpc": "2.0",
+		"method": "eth_sendTransaction",
+		"params": [{
+			"from": ""#.to_owned() + format!("0x{:?}", address).as_ref() + r#"",
+			"to": "",
+			"gas": "0x76c0",
+			"gasPrice": "0x9184e72a000",
+			"value": "0x9184e72a"
+		}],
+		"id": 1
+	}"#;
+
+	let response = r#"{"jsonrpc":"2.0","error":{"code":-32602,"message":"Invalid params","data":null},"id":1}"#;
+
+	assert_eq!(tester.io.handle_request(&request), Some(response.into()));
+}
+
 
 #[test]
 fn rpc_eth_send_transaction_error() {

rpc/src/v1/types/hash.rs

@@ -116,13 +116,17 @@ macro_rules! impl_hash {
 					type Value = $name;
 
 					fn visit_str<E>(&mut self, value: &str) -> Result<Self::Value, E> where E: serde::Error {
+
+						if value.len() != 2 + $size * 2 {
+							return Err(serde::Error::custom("Invalid length."));
+						}
+
 						match value[2..].from_hex() {
-							Ok(ref v) if v.len() == $size => {
+							Ok(ref v) => {
 								let mut result = [0u8; $size];
 								result.copy_from_slice(v);
 								Ok($name(result))
 							},
-							Ok(_) => Err(serde::Error::custom("Invalid length.")),
 							_ => Err(serde::Error::custom("Invalid hex value."))
 						}
 					}

rpc/src/v1/types/transaction_request.rs

@@ -188,6 +188,22 @@ mod tests {
 		});
 	}
 
+
+	#[test]
+	fn transaction_request_deserialize_error() {
+		let s = r#"{
+			"from":"0xb5f7502a2807cb23615c7456055e1d65b2508625",
+			"to":"",
+			"data":"0x8595bab1",
+			"gas":"0x2fd618",
+			"gasPrice":"0x0ba43b7400"
+		}"#;
+
+		let deserialized = serde_json::from_str::<TransactionRequest>(s);
+
+		assert!(deserialized.is_err(), "Should be error because to is empty");
+	}
+
 	#[test]
 	fn should_deserialize_modification() {
 		// given