Handle invalid passwords

js/src/api/local/localAccountsMiddleware.js

@@ -170,6 +170,12 @@ export default class LocalAccountsMiddleware extends Middleware {
         account.decryptPrivateKey(password)
       ])
       .then(([nonce, privateKey]) => {
+        if (!privateKey) {
+          transactions.unlock(id);
+
+          throw new Error('Invalid password');
+        }
+
         const tx = new EthereumTx({
           nonce,
           to,

js/src/api/local/transactions.js

@@ -68,6 +68,16 @@ class Transactions {
     state.status = LOCKED;
   }
 
+  unlock (id) {
+    const state = this._states[id];
+
+    if (!state || state.status !== LOCKED) {
+      throw new Error('Trying to unlock an invalid transaction');
+    }
+
+    state.status = AWAITING;
+  }
+
   hash (id) {
     const state = this._states[id];