Updated avatar color selection logic (#2151)

* updated avatar color selection logic

* tweaks

* more tweaks

* formatting

src/App/Controls/AccountViewCell/AccountViewCellViewModel.cs

@@ -14,7 +14,7 @@ namespace Bit.App.Controls
         {
             AccountView = accountView;
             AvatarImageSource = ServiceContainer.Resolve<IAvatarImageSourcePool>("avatarImageSourcePool")
-                                                ?.GetOrCreateAvatar(AccountView.Name, AccountView.Email);
+                ?.GetOrCreateAvatar(AccountView.UserId, AccountView.Name, AccountView.Email);
         }
 
         public AccountView AccountView

src/App/Controls/AvatarImageSource.cs

@@ -3,6 +3,7 @@ using System.IO;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using Bit.Core.Utilities;
 using SkiaSharp;
 using Xamarin.Forms;
 
@@ -10,7 +11,8 @@ namespace Bit.App.Controls
 {
     public class AvatarImageSource : StreamImageSource
     {
-        private string _data;
+        private readonly string _text;
+        private readonly string _id;
 
         public override bool Equals(object obj)
         {
@@ -21,20 +23,21 @@ namespace Bit.App.Controls
 
             if (obj is AvatarImageSource avatar)
             {
-                return avatar._data == _data;
+                return avatar._text == _text;
             }
 
             return base.Equals(obj);
         }
 
-        public override int GetHashCode() => _data?.GetHashCode() ?? -1;
+        public override int GetHashCode() => _text?.GetHashCode() ?? -1;
 
-        public AvatarImageSource(string name = null, string email = null)
+        public AvatarImageSource(string userId = null, string name = null, string email = null)
         {
-            _data = name;
-            if (string.IsNullOrWhiteSpace(_data))
+            _id = userId;
+            _text = name;
+            if (string.IsNullOrWhiteSpace(_text))
             {
-                _data = email;
+                _text = email;
             }
         }
 
@@ -52,24 +55,24 @@ namespace Bit.App.Controls
         private Stream Draw()
         {
             string chars;
-            string upperData = null;
+            string upperCaseText = null;
 
-            if (string.IsNullOrEmpty(_data))
+            if (string.IsNullOrEmpty(_text))
             {
                 chars = "..";
             }
-            else if (_data?.Length > 1)
+            else if (_text?.Length > 1)
             {
-                upperData = _data.ToUpper();
-                chars = GetFirstLetters(upperData, 2);
+                upperCaseText = _text.ToUpper();
+                chars = GetFirstLetters(upperCaseText, 2);
             }
             else
             {
-                chars = upperData = _data.ToUpper();
+                chars = upperCaseText = _text.ToUpper();
             }
 
-            var bgColor = StringToColor(upperData);
-            var textColor = Color.White;
+            var bgColor = CoreHelpers.StringToColor(_id ?? upperCaseText, "#33ffffff");
+            var textColor = CoreHelpers.TextColorFromBgColor(bgColor);
             var size = 50;
 
             using (var bitmap = new SKBitmap(size * 2,
@@ -85,7 +88,7 @@ namespace Bit.App.Controls
                         IsAntialias = true,
                         Style = SKPaintStyle.Fill,
                         StrokeJoin = SKStrokeJoin.Miter,
-                        Color = SKColor.Parse(bgColor.ToHex())
+                        Color = SKColor.Parse(bgColor)
                     })
                     {
                         var midX = canvas.LocalClipBounds.Size.ToSizeI().Width / 2;
@@ -97,7 +100,7 @@ namespace Bit.App.Controls
                             IsAntialias = true,
                             Style = SKPaintStyle.Fill,
                             StrokeJoin = SKStrokeJoin.Miter,
-                            Color = SKColor.Parse(bgColor.ToHex())
+                            Color = SKColor.Parse(bgColor)
                         })
                         {
                             canvas.DrawCircle(midX, midY, radius, circlePaint);
@@ -108,7 +111,7 @@ namespace Bit.App.Controls
                             {
                                 IsAntialias = true,
                                 Style = SKPaintStyle.Fill,
-                                Color = SKColor.Parse(textColor.ToHex()),
+                                Color = SKColor.Parse(textColor),
                                 TextSize = textSize,
                                 TextAlign = SKTextAlign.Center,
                                 Typeface = typeface

src/App/Controls/AvatarImageSourcePool.cs

@@ -5,19 +5,19 @@ namespace Bit.App.Controls
 {
     public interface IAvatarImageSourcePool
     {
-        AvatarImageSource GetOrCreateAvatar(string name, string email);
+        AvatarImageSource GetOrCreateAvatar(string userId, string name, string email);
     }
 
     public class AvatarImageSourcePool : IAvatarImageSourcePool
     {
         private readonly ConcurrentDictionary<string, AvatarImageSource> _cache = new ConcurrentDictionary<string, AvatarImageSource>();
 
-        public AvatarImageSource GetOrCreateAvatar(string name, string email)
+        public AvatarImageSource GetOrCreateAvatar(string userId, string name, string email)
         {
-            var key = $"{name}{email}";
+            var key = $"{userId}{name}{email}";
             if (!_cache.TryGetValue(key, out var avatar))
             {
-                avatar = new AvatarImageSource(name, email);
+                avatar = new AvatarImageSource(userId, name, email);
                 if (!_cache.TryAdd(key, avatar)
                     &&
                     !_cache.TryGetValue(key, out avatar)) // If add fails another thread created the avatar in between the first try get and the try add.

src/App/Pages/BaseContentPage.cs

@@ -129,7 +129,8 @@ namespace Bit.App.Pages
         {
             if (useCurrentActiveAccount)
             {
-                return new AvatarImageSource(await _stateService.GetNameAsync(), await _stateService.GetEmailAsync());
+                return new AvatarImageSource(await _stateService.GetActiveUserIdAsync(),
+                    await _stateService.GetNameAsync(), await _stateService.GetEmailAsync());
             }
             return new AvatarImageSource();
         }

src/Core/Utilities/CoreHelpers.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 using System.Linq;
 using System.Text.RegularExpressions;
 using System.Web;
@@ -264,5 +265,36 @@ namespace Bit.Core.Utilities
         {
             return JsonConvert.DeserializeObject<T>(JsonConvert.SerializeObject(obj));
         }
+
+        public static string TextColorFromBgColor(string hexColor, int threshold = 166)
+        {
+            if (new ColorConverter().ConvertFromString(hexColor) is Color bgColor)
+            {
+                var luminance = bgColor.R * 0.299 + bgColor.G * 0.587 + bgColor.B * 0.114;
+                return luminance > threshold ? "#ff000000" : "#ffffffff";
+            }
+
+            return "#ff000000";
+        }
+
+        public static string StringToColor(string str, string fallback)
+        {
+            if (str == null)
+            {
+                return fallback;
+            }
+            var hash = 0;
+            for (var i = 0; i < str.Length; i++)
+            {
+                hash = str[i] + ((hash << 5) - hash);
+            }
+            var color = "#FF";
+            for (var i = 0; i < 3; i++)
+            {
+                var value = (hash >> (i * 8)) & 0xff;
+                color += Convert.ToString(value, 16).PadLeft(2, '0');
+            }
+            return color;
+        }
     }
 }

src/iOS.Core/Utilities/AccountSwitchingOverlayHelper.cs

@@ -32,8 +32,9 @@ namespace Bit.iOS.Core.Utilities
                 {
                     throw new NullReferenceException(nameof(_stateService));
                 }
-                
-                var avatarImageSource = new AvatarImageSource(await _stateService.GetNameAsync(), await _stateService.GetEmailAsync());
+
+                var avatarImageSource = new AvatarImageSource(await _stateService.GetActiveUserIdAsync(),
+                    await _stateService.GetNameAsync(), await _stateService.GetEmailAsync());
                 using (var avatarUIImage = await avatarImageSource.GetNativeImageAsync())
                 {
                     return avatarUIImage?.ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal) ?? UIImage.GetSystemImage(DEFAULT_SYSTEM_AVATAR_IMAGE);