FIX: weird import screen scan qr code behaviour

BlueComponents.js

@@ -2088,7 +2088,7 @@ export class BlueAddressInput extends Component {
         <TouchableOpacity
           disabled={this.props.isLoading}
           onPress={() => {
-            NavigationService.navigate('ScanQrAddress', { onBarScanned: this.props.onBarScanned, launchedBy: this.props.launchedBy });
+            NavigationService.navigate('ScanQRCode', { onBarScanned: this.props.onBarScanned, launchedBy: this.props.launchedBy });
             Keyboard.dismiss();
           }}
           style={{

MainBottomTabs.js

@@ -35,7 +35,7 @@ import rbfCancel from './screen/transactions/RBFCancel';
 import receiveDetails from './screen/receive/details';
 
 import sendDetails from './screen/send/details';
-import ScanQRCode from './screen/send/scanQrAddress';
+import ScanQRCode from './screen/send/ScanQRCode';
 import sendCreate from './screen/send/create';
 import Confirm from './screen/send/confirm';
 import PsbtWithHardwareWallet from './screen/send/psbtWithHardwareWallet';
@@ -251,7 +251,7 @@ const HandleOffchainAndOnChainStackNavigator = createStackNavigator(
         header: null,
       },
     },
-    ScanQrAddress: {
+    ScanQRCode: {
       screen: ScanQRCode,
     },
     SendDetails: {
@@ -322,7 +322,7 @@ const MainBottomTabs = createStackNavigator(
         header: null,
       },
     },
-    ScanQrAddress: {
+    ScanQRCode: {
       screen: ScanQRCode,
     },
     LappBrowser: {

screen/lnd/lndCreateInvoice.js

@@ -209,7 +209,7 @@ export default class LNDCreateInvoice extends Component {
       <TouchableOpacity
         disabled={this.state.isLoading}
         onPress={() => {
-          NavigationService.navigate('ScanQrAddress', {
+          NavigationService.navigate('ScanQRCode', {
             onBarScanned: this.processLnurl,
             launchedBy: this.props.navigation.state.routeName,
           });

screen/send/ScanQRCode.js

@@ -9,6 +9,7 @@ import { useNavigationParam, useNavigation } from 'react-navigation-hooks';
 import DocumentPicker from 'react-native-document-picker';
 import RNFS from 'react-native-fs';
 const LocalQRCode = require('@remobile/react-native-qrcode-local-image');
+const createHash = require('create-hash');
 
 const ScanQRCode = ({
   onBarScanned = useNavigationParam('onBarScanned'),
@@ -21,7 +22,23 @@ const ScanQRCode = ({
   const [isLoading, setIsLoading] = useState(false);
   const { navigate, goBack } = useNavigation();
 
+  const scannedCache = {};
+
+  const HashIt = function(s) {
+    return createHash('sha256')
+      .update(s)
+      .digest()
+      .toString('hex');
+  };
+
   const onBarCodeRead = ret => {
+    const h = HashIt(ret.data);
+    if (scannedCache[h]) {
+      // this QR was already scanned by this ScanQRCode, lets prevent firing duplicate callbacks
+      return;
+    }
+    scannedCache[h] = +new Date();
+
     if (!isLoading && !cameraPreviewIsPaused) {
       setIsLoading(true);
       try {

screen/wallets/import.js

@@ -120,7 +120,7 @@ const WalletsImport = () => {
         <BlueButtonLink
           title={loc.wallets.import.scan_qr}
           onPress={() => {
-            navigate('ScanQrAddress', { launchedBy: 'ImportWallet', onBarScanned, showFileImportButton: true });
+            navigate('ScanQRCode', { launchedBy: 'ImportWallet', onBarScanned, showFileImportButton: true });
           }}
         />
       </View>

screen/wallets/list.js

@@ -19,7 +19,7 @@ import PropTypes from 'prop-types';
 import { PlaceholderWallet } from '../../class';
 import WalletImport from '../../class/walletImport';
 import Swiper from 'react-native-swiper';
-import ScanQRCode from '../send/scanQrAddress';
+import ScanQRCode from '../send/ScanQRCode';
 import DeeplinkSchemaMatch from '../../class/deeplinkSchemaMatch';
 let EV = require('../../events');
 let A = require('../../analytics');