Add conditions to the signature to reject duplicates

src/accountant.rs

@@ -118,6 +118,7 @@ impl Accountant {
 
         if !tr.if_all.is_empty() {
             self.pending.insert(tr.sig, tr.clone());
+            return Ok(());
         }
 
         if self.balances.contains_key(&tr.to) {

src/transaction.rs

@@ -60,7 +60,14 @@ impl<T: Serialize> Transaction<T> {
     }
 
     fn get_sign_data(&self) -> Vec<u8> {
-        serialize(&(&self.from, &self.to, &self.asset, &self.last_id)).unwrap()
+        serialize(&(
+            &self.from,
+            &self.to,
+            &self.if_all,
+            &self.unless_any,
+            &self.asset,
+            &self.last_id,
+        )).unwrap()
     }
 
     pub fn sign(&mut self, keypair: &KeyPair) {