From 9e1d1752faa51482e7114f0824827173bdf47980 Mon Sep 17 00:00:00 2001
From: Chernykh Aleksandr <dernet4@gmail.com>
Date: Sat, 28 Feb 2026 23:00:35 +0300
Subject: [PATCH] added logic of password security

---
 src/KeyKeeper/Views/EntryEditWindow.axaml.cs | 87 +++++++++++++++++---
 1 file changed, 77 insertions(+), 10 deletions(-)

diff --git a/src/KeyKeeper/Views/EntryEditWindow.axaml.cs b/src/KeyKeeper/Views/EntryEditWindow.axaml.cs
index 65cb607..bf46683 100644
--- a/src/KeyKeeper/Views/EntryEditWindow.axaml.cs
+++ b/src/KeyKeeper/Views/EntryEditWindow.axaml.cs
@@ -1,33 +1,100 @@
 using System;
+using System.Text.RegularExpressions;
 using Avalonia.Controls;
 using Avalonia.Interactivity;
+using Avalonia.Media;
 using KeyKeeper.PasswordStore;
 using static KeyKeeper.PasswordStore.FileFormatConstants;
 
 namespace KeyKeeper.Views;
 
-public partial class EntryEditWindow: Window
+public partial class EntryEditWindow : Window
 {
     public PassStoreEntryPassword? EditedEntry;
 
     public EntryEditWindow()
     {
         InitializeComponent();
+        if (PasswordEdit != null)
+        {
+            PasswordEdit.TextChanged += PasswordTextChanged;
+        }
+    }
+
+    private void PasswordTextChanged(object? sender, TextChangedEventArgs e)
+    {
+        string password = PasswordEdit?.Text ?? "";
+        UpdatePasswordStrengthIndicator(password);
+    }
+
+    private void UpdatePasswordStrengthIndicator(string password)
+    {
+        if (PasswordStrengthFill == null || PasswordStrengthIndicator == null)
+            return;
+
+        if (string.IsNullOrEmpty(password))
+        {
+            PasswordStrengthFill.Width = 0;
+            return;
+        }
+
+        int strength = CalculatePasswordStrength(password);
+
+        double maxWidth = PasswordStrengthIndicator.Bounds.Width;
+        if (maxWidth <= 0) maxWidth = 200; 
+
+        PasswordStrengthFill.Width = (strength / 100.0) * maxWidth;
+
+        if (strength < 30)
+        {
+            PasswordStrengthFill.Background = new SolidColorBrush(Colors.Red);
+        }
+        else if (strength < 60)
+        {
+            PasswordStrengthFill.Background = new SolidColorBrush(Colors.Orange);
+        }
+        else if (strength < 80)
+        {
+            PasswordStrengthFill.Background = new SolidColorBrush(Colors.Gold);
+        }
+        else
+        {
+            PasswordStrengthFill.Background = new SolidColorBrush(Colors.Green);
+        }
+    }
+
+    private int CalculatePasswordStrength(string password)
+    {
+        int score = 0;
+
+        if (password.Length >= 8) score += 10;
+        if (password.Length >= 12) score += 10;
+        if (password.Length >= 16) score += 5;
+
+        if (Regex.IsMatch(password, @"\d")) score += 10;
+
+        if (Regex.IsMatch(password, @"[a-z]")) score += 10;
+
+        if (Regex.IsMatch(password, @"[A-Z]")) score += 15;
+
+        if (Regex.IsMatch(password, @"[!@#$%^&*()_+\-=\[\]{};':""\\|,.<>\/?]")) score += 20;
+
+        var uniqueChars = new System.Collections.Generic.HashSet<char>(password).Count;
+        score += Math.Min(20, uniqueChars * 2);
+
+        return Math.Min(100, score);
     }
 
     private void AddButton_Click(object sender, RoutedEventArgs args)
     {
-        string name = EntryNameEdit.Text ?? "";
-        name = name.Trim();
-        if (name.Length == 0) return;
+        string name = EntryNameEdit?.Text?.Trim() ?? "";
+        if (string.IsNullOrEmpty(name)) return;
 
-        string username = UsernameEdit.Text ?? "";
-        username = username.Trim();
-        if (username.Length == 0) return;
+        string username = UsernameEdit?.Text?.Trim() ?? "";
+        if (string.IsNullOrEmpty(username)) return;
 
-        string password = PasswordEdit.Text ?? "";
-        password = password.Trim();
-        if (password.Length == 0) return;
+        string password = PasswordEdit?.Text ?? "";
+        if (string.IsNullOrEmpty(password)) return;
 
         EditedEntry = new PassStoreEntryPassword(
             Guid.NewGuid(),