Keep privateKey out of state and clear it after closing export private key modal.

ui/app/actions.js

@@ -106,6 +106,7 @@ var actions = {
   exportAccount: exportAccount,
   SHOW_PRIVATE_KEY: 'SHOW_PRIVATE_KEY',
   showPrivateKey: showPrivateKey,
+  exportAccountComplete,
   SAVE_ACCOUNT_LABEL: 'SAVE_ACCOUNT_LABEL',
   saveAccountLabel: saveAccountLabel,
   // tx conf screen
@@ -984,27 +985,39 @@ function exportAccount (password, address) {
     dispatch(self.showLoadingIndication())
 
     log.debug(`background.submitPassword`)
+    return new Promise((resolve, reject) => {
       background.submitPassword(password, function (err) {
         if (err) {
           log.error('Error in submiting password.')
           dispatch(self.hideLoadingIndication())
-        return dispatch(self.displayWarning('Incorrect Password.'))
+          dispatch(self.displayWarning('Incorrect Password.'))
+          return reject(err)
         }
         log.debug(`background.exportAccount`)
-      background.exportAccount(address, function (err, result) {
+        return background.exportAccount(address, function (err, result) {
           dispatch(self.hideLoadingIndication())
 
           if (err) {
             log.error(err)
-          return dispatch(self.displayWarning('Had a problem exporting the account.'))
+            dispatch(self.displayWarning('Had a problem exporting the account.'))
+            return reject(err)
           }
 
-        dispatch(self.showPrivateKey(result))
+          dispatch(self.exportAccountComplete())
+
+          return resolve(result)
+        })
       })
     })
   }
 }
 
+function exportAccountComplete() {
+  return {
+    type: actions.EXPORT_ACCOUNT,
+  }
+}
+
 function showPrivateKey (key) {
   return {
     type: actions.SHOW_PRIVATE_KEY,

ui/app/components/modals/export-private-key-modal.js

@@ -31,12 +31,20 @@ function ExportPrivateKeyModal () {
   Component.call(this)
 
   this.state = {
-    password: ''
+    password: '',
+    privateKey: null,
   }
 }
 
 module.exports = connect(mapStateToProps, mapDispatchToProps)(ExportPrivateKeyModal)
 
+ExportPrivateKeyModal.prototype.exportAccountAndGetPrivateKey = function (password, address) {
+  const { exportAccount } = this.props
+
+  exportAccount(password, address)
+    .then(privateKey => this.setState({ privateKey }))
+}
+
 ExportPrivateKeyModal.prototype.renderPasswordLabel = function (privateKey) {
   return h('span.private-key-password-label', privateKey
     ? 'This is your private key (click to copy)'
@@ -68,15 +76,13 @@ ExportPrivateKeyModal.prototype.renderButton = function (className, onClick, lab
   }, label)
 }
 
-ExportPrivateKeyModal.prototype.renderButtons = function (privateKey, password, address) {
+ExportPrivateKeyModal.prototype.renderButtons = function (privateKey, password, address, hideModal) {
-  const { hideModal, exportAccount } = this.props
-
   return h('div.export-private-key-buttons', {}, [
     !privateKey && this.renderButton('btn-clear btn-cancel', () => hideModal(), 'Cancel'),
 
     (privateKey
       ? this.renderButton('btn-clear', () => hideModal(), 'Done')
-      : this.renderButton('btn-clear', () => exportAccount(this.state.password, address), 'Download')
+      : this.renderButton('btn-clear', () => this.exportAccountAndGetPrivateKey(this.state.password, address), 'Download')
     ),
 
   ])
@@ -86,7 +92,6 @@ ExportPrivateKeyModal.prototype.render = function () {
   const {
     selectedIdentity,
     network,
-    privateKey,
     warning,
     showAccountDetailModal,
     hideModal,
@@ -94,6 +99,8 @@ ExportPrivateKeyModal.prototype.render = function () {
   } = this.props
   const { name, address } = selectedIdentity
 
+  const { privateKey } = this.state
+
   return h(AccountModalContainer, {
     showBackButton: previousModalState === 'ACCOUNT_DETAILS',
     backButtonAction: () => showAccountDetailModal(),
@@ -124,7 +131,7 @@ ExportPrivateKeyModal.prototype.render = function () {
         account.`
       ),
 
-      this.renderButtons(privateKey, this.state.password, address),
+      this.renderButtons(privateKey, this.state.password, address, hideModal),
       
   ])
 }