Implemented cooldown before User is able to resend confirmation code for 2fa

frontend/pweb/lib/providers/two_factor.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 import 'package:logging/logging.dart';
@@ -14,15 +16,21 @@ class TwoFactorProvider extends ChangeNotifier {
   TwoFactorProvider();
 
   bool _isSubmitting = false;
+  bool _isResending = false;
   bool _hasError = false;
   bool _verificationSuccess = false;
   String? _errorMessage;
   String? _currentPendingToken;
+  Timer? _cooldownTimer;
+  int _cooldownRemainingSeconds = 0;
 
   bool get isSubmitting => _isSubmitting;
+  bool get isResending => _isResending;
   bool get hasError => _hasError;
   bool get verificationSuccess => _verificationSuccess;
   String? get errorMessage => _errorMessage;
+  int get cooldownRemainingSeconds => _cooldownRemainingSeconds;
+  bool get isCooldownActive => _cooldownRemainingSeconds > 0;
   PendingLogin? get pendingLogin => _accountProvider.pendingLogin;
 
   void update(AccountProvider accountProvider) {
@@ -33,6 +41,7 @@ class TwoFactorProvider extends ChangeNotifier {
       _resetState();
       _currentPendingToken = token;
     }
+    _syncCooldown(pending);
   }
 
   Future<void> submitCode(String code) async {
@@ -70,12 +79,23 @@ class TwoFactorProvider extends ChangeNotifier {
       _logger.warning('No pending login to resend code for');
       return;
     }
+    if (_isResending || isCooldownActive) return;
+
+    _isResending = true;
+    _hasError = false;
+    _errorMessage = null;
+    notifyListeners();
+
     try {
-      await VerificationService.resendLoginCode(pending);
+      final confirmation = await VerificationService.resendLoginCode(pending);
+      _accountProvider.updatePendingLogin(confirmation);
+      _startCooldown(confirmation.cooldownSeconds);
     } catch (e) {
       _logger.warning('Failed to resend login code', e);
       _hasError = true;
       _errorMessage = e.toString();
+    } finally {
+      _isResending = false;
       notifyListeners();
     }
   }
@@ -87,9 +107,71 @@ class TwoFactorProvider extends ChangeNotifier {
 
   void _resetState() {
     _isSubmitting = false;
+    _isResending = false;
     _hasError = false;
     _errorMessage = null;
     _verificationSuccess = false;
+    _stopCooldown();
     notifyListeners();
   }
+
+  void _syncCooldown(PendingLogin? pending) {
+    if (pending == null) {
+      _stopCooldown(notify: _cooldownRemainingSeconds != 0);
+      return;
+    }
+
+    final remaining = pending.cooldownRemainingSeconds;
+    if (remaining <= 0) {
+      _stopCooldown(notify: _cooldownRemainingSeconds != 0);
+      return;
+    }
+
+    if (_cooldownRemainingSeconds != remaining) {
+      _startCooldown(remaining);
+    }
+  }
+
+  void _startCooldown(int seconds) {
+    _cooldownTimer?.cancel();
+    _cooldownRemainingSeconds = seconds;
+
+    if (_cooldownRemainingSeconds <= 0) {
+      _cooldownTimer = null;
+      notifyListeners();
+      return;
+    }
+
+    _cooldownTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
+      if (_cooldownRemainingSeconds <= 1) {
+        _cooldownRemainingSeconds = 0;
+        _cooldownTimer?.cancel();
+        _cooldownTimer = null;
+        notifyListeners();
+        return;
+      }
+
+      _cooldownRemainingSeconds -= 1;
+      notifyListeners();
+    });
+
+    notifyListeners();
+  }
+
+  void _stopCooldown({bool notify = false}) {
+    _cooldownTimer?.cancel();
+    _cooldownTimer = null;
+    final hadCooldown = _cooldownRemainingSeconds != 0;
+    _cooldownRemainingSeconds = 0;
+
+    if (notify && hadCooldown) {
+      notifyListeners();
+    }
+  }
+
+  @override
+  void dispose() {
+    _stopCooldown();
+    super.dispose();
+  }
 }