scan page

src/App/App.csproj

@@ -64,6 +64,9 @@
     <Compile Update="Pages\Vault\CollectionsPage.xaml.cs">
       <DependentUpon>CollectionsPage.xaml</DependentUpon>
     </Compile>
+    <Compile Update="Pages\Vault\ScanPage.xaml.cs">
+      <DependentUpon>ScanPage.xaml</DependentUpon>
+    </Compile>
     <Compile Update="Pages\Vault\SharePage.xaml.cs">
       <DependentUpon>SharePage.xaml</DependentUpon>
     </Compile>

src/App/Pages/Vault/ScanPage.xaml

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<pages:BaseContentPage 
+    xmlns="http://xamarin.com/schemas/2014/forms"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="Bit.App.Pages.ScanPage"
+    xmlns:pages="clr-namespace:Bit.App.Pages"
+    xmlns:u="clr-namespace:Bit.App.Utilities"
+    xmlns:zxing="clr-namespace:ZXing.Net.Mobile.Forms;assembly=ZXing.Net.Mobile.Forms"
+    x:Name="_page"
+    Title="{u:I18n ScanQrTitle}">
+
+    <Grid
+        VerticalOptions="FillAndExpand"
+        HorizontalOptions="FillAndExpand">
+
+        <zxing:ZXingScannerView
+            x:Name="_zxing"
+            HorizontalOptions="FillAndExpand"
+            VerticalOptions="FillAndExpand"
+            AutomationId="zxingScannerView"
+            OnScanResult="OnScanResult">
+        </zxing:ZXingScannerView>
+
+        <Grid
+            VerticalOptions="FillAndExpand"
+            HorizontalOptions="FillAndExpand"
+            AutomationId="zxingDefaultOverlay">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="*" />
+                <RowDefinition Height="*" />
+                <RowDefinition Height="*" />
+            </Grid.RowDefinitions>
+
+            <BoxView
+                Grid.Column="0"
+                Grid.Row="0"
+                VerticalOptions="Fill"
+                HorizontalOptions="FillAndExpand"
+                BackgroundColor="Black"
+                Opacity="0.7" />
+
+            <Label
+                Text="{u:I18n CameraInstructionTop}"
+                AutomationId="zxingDefaultOverlay_TopTextLabel"
+                Grid.Column="0"
+                Grid.Row="0"
+                VerticalOptions="Center"
+                HorizontalOptions="Center"
+                BackgroundColor="White" />
+
+            <BoxView
+                Grid.Column="0"
+                Grid.Row="1"
+                VerticalOptions="Fill"
+                HorizontalOptions="FillAndExpand"
+                BackgroundColor="Transparent" />
+
+            <BoxView
+                Grid.Column="0"
+                Grid.Row="2"
+                VerticalOptions="Fill"
+                HorizontalOptions="FillAndExpand"
+                BackgroundColor="Black"
+                Opacity="0.7" />
+
+            <Label
+                Text="{u:I18n CameraInstructionBottom}"
+                AutomationId="zxingDefaultOverlay_BottomTextLabel"
+                Grid.Column="0"
+                Grid.Row="2"
+                VerticalOptions="Center"
+                HorizontalOptions="Center"
+                BackgroundColor="White" />
+        </Grid>
+
+    </Grid>
+
+</pages:BaseContentPage>

src/App/Pages/Vault/ScanPage.xaml.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using Xamarin.Forms;
+
+namespace Bit.App.Pages
+{
+    public partial class ScanPage : BaseContentPage
+    {
+        private readonly Action<string> _callback;
+
+        private DateTime? _timerStarted = null;
+        private TimeSpan _timerMaxLength = TimeSpan.FromMinutes(3);
+
+        public ScanPage(Action<string> callback)
+        {
+            _callback = callback;
+            _zxing.Options = new ZXing.Mobile.MobileBarcodeScanningOptions
+            {
+                UseNativeScanning = true,
+                PossibleFormats = new List<ZXing.BarcodeFormat> { ZXing.BarcodeFormat.QR_CODE },
+                AutoRotate = false,
+            };
+            InitializeComponent();
+        }
+
+        protected override void OnAppearing()
+        {
+            base.OnAppearing();
+            _zxing.IsScanning = true;
+            _timerStarted = DateTime.Now;
+            Device.StartTimer(new TimeSpan(0, 0, 2), () =>
+            {
+                if(_timerStarted == null || (DateTime.Now - _timerStarted) > _timerMaxLength)
+                {
+                    return false;
+                }
+                _zxing.AutoFocus();
+                return true;
+            });
+        }
+
+        protected override void OnDisappearing()
+        {
+            _timerStarted = null;
+            _zxing.IsScanning = false;
+            base.OnDisappearing();
+        }
+
+        private void OnScanResult(ZXing.Result result)
+        {
+            // Stop analysis until we navigate away so we don't keep reading barcodes
+            _zxing.IsAnalyzing = false;
+            _zxing.IsScanning = false;
+            if(!string.IsNullOrWhiteSpace(result?.Text) &&
+                Uri.TryCreate(result.Text, UriKind.Absolute, out Uri uri) &&
+                !string.IsNullOrWhiteSpace(uri?.Query))
+            {
+                var queryParts = uri.Query.Substring(1).ToLowerInvariant().Split('&');
+                foreach(var part in queryParts)
+                {
+                    if(part.StartsWith("secret="))
+                    {
+                        _callback(part.Substring(7)?.ToUpperInvariant());
+                        return;
+                    }
+                }
+            }
+            _callback(null);
+        }
+    }
+}