Check for clock skew on login

ios/edge/Info.plist

@@ -68,6 +68,13 @@
 	<dict>
 		<key>NSExceptionDomains</key>
 		<dict>
+			<key>worldtimeapi.org</key>
+			<dict>
+				<key>NSIncludesSubdomains</key>
+				<true/>
+				<key>NSExceptionAllowsInsecureHTTPLoads</key>
+				<true/>
+			</dict>
 			<key>localhost</key>
 			<dict>
 				<key>NSExceptionAllowsInsecureHTTPLoads</key>

src/constants/IconConstants.js

@@ -22,6 +22,7 @@ export const CUSTOM_FEES_ICON = 'wpexplorer'
 export const EXCHANGE_ICON = 'exchange'
 export const QUESTION_ICON = 'question'
 export const FA_MONEY_ICON = 'money'
+export const CLOCK = 'clock-o'
 
 // Feather
 export const FEATHER_ICONS = 'featherIcons'

src/locales/en_US.js

@@ -491,7 +491,10 @@ const strings = {
   alert_deep_link_no_wallet: 'No wallets exist that support %1$s. You can create a wallet for %2$s by tapping + on the Wallet List screen.',
   load_plugin: 'Load Plugin',
   plugin_url: 'Plugin URL',
-  choose_your_wallet: 'Choose Your Wallet'
+  choose_your_wallet: 'Choose Your Wallet',
+  clock_skew_modal_title: 'Clock skew detected',
+  clock_skew_modal_message:
+    'Your device clock is off by more than 30 seconds from the correct time. This can cause issues logging into your account. Please correct the time skew on your device.'
 }
 
 // export default strings

src/locales/strings/enUS.json

@@ -455,5 +455,7 @@
   "alert_deep_link_no_wallet": "No wallets exist that support %1$s. You can create a wallet for %2$s by tapping + on the Wallet List screen.",
   "load_plugin": "Load Plugin",
   "plugin_url": "Plugin URL",
-  "choose_your_wallet": "Choose Your Wallet"
+  "choose_your_wallet": "Choose Your Wallet",
+  "clock_skew_modal_title": "Clock skew detected",
+  "clock_skew_modal_message": "Your device clock is off by more than 30 seconds from the correct time. This can cause issues logging into your account. Please correct the time skew on your device."
 }

src/modules/Login/action.js

@@ -1,6 +1,8 @@
 // @flow
 
+import { createSimpleConfirmModal, showModal } from 'edge-components'
 import type { EdgeAccount } from 'edge-core-js'
+import React from 'react'
 import { Platform } from 'react-native'
 import Locale from 'react-native-locale'
 import PushNotification from 'react-native-push-notification'
@@ -29,6 +31,7 @@ import {
 import * as CORE_SELECTORS from '../Core/selectors'
 import { updateWalletsRequest } from '../Core/Wallets/action.js'
 import type { Dispatch, GetState } from '../ReduxTypes'
+import { Icon } from '../UI/components/Icon/Icon.ui.js'
 
 const localeInfo = Locale.constants() // should likely be moved to login system and inserted into Redux
 
@@ -180,6 +183,30 @@ export const initializeAccount = (account: EdgeAccount, touchIdInfo: Object) =>
     accountInitObject.pinMode = coreFinal.pinMode
     accountInitObject.otpMode = coreFinal.otpMode
 
+    // Check clock skew against atomic time
+    try {
+      const remoteTime = await fetch('http://worldtimeapi.org/api/timezone/Etc/GMT')
+      const body = await remoteTime.json()
+      const remoteSecondsSinceEpoch = body.unixtime
+
+      const localSecondsSinceEpoch = Date.now() / 1000
+
+      const clockSkew = Math.abs(localSecondsSinceEpoch - remoteSecondsSinceEpoch)
+
+      if (clockSkew > 30) {
+        const modal = createSimpleConfirmModal({
+          title: s.strings.clock_skew_modal_title,
+          message: s.strings.clock_skew_modal_message,
+          icon: <Icon type={Constants.FONT_AWESOME} name={Constants.CLOCK} size={35} />,
+          buttonText: s.strings.string_ok
+        })
+
+        showModal(modal)
+      }
+    } catch (e) {
+      console.log('Time check error: ', e)
+    }
+
     dispatch({
       type: 'ACCOUNT_INIT_COMPLETE',
       data: { ...accountInitObject }