TF-3349 Escape messages when forward and reply email

model/lib/extensions/email_address_extension.dart

@@ -27,6 +27,17 @@ extension EmailAddressExtension on EmailAddress {
     return '';
   }
 
+  String asFullStringWithLtGtCharacter() {
+    if (displayName.isNotEmpty && emailAddress.isNotEmpty) {
+      return '${displayName.capitalizeFirstEach} <$emailAddress>';
+    } else if (displayName.isNotEmpty) {
+      return displayName.capitalizeFirstEach;
+    } else if (emailAddress.isNotEmpty) {
+      return '<$emailAddress>';
+    }
+    return '';
+  }
+
   String get emailAddress => email ?? '';
 
   String get displayName => name ?? '';

model/lib/extensions/list_email_address_extension.dart

@@ -1,3 +1,4 @@
+import 'package:core/presentation/extensions/html_extension.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:model/mailbox/expand_mode.dart';
 import 'package:model/extensions/email_address_extension.dart';
@@ -27,6 +28,18 @@ extension SetEmailAddressExtension on Set<EmailAddress>? {
     return listEmail.isNotEmpty ? listEmail.join(', ') : '';
   }
 
+  String toEscapeHtmlString(String separator) {
+    if (this?.isNotEmpty != true) return '';
+
+    final listEmail = this
+      !.map((emailAddress) => emailAddress.asFullStringWithLtGtCharacter().escapeLtGtHtmlString())
+      .toList();
+
+    return listEmail.isNotEmpty ? listEmail.join(separator) : '';
+  }
+
+  String toEscapeHtmlStringUseCommaSeparator() => toEscapeHtmlString(', ');
+
   int numberEmailAddress() => this != null ? this!.length : 0;
 
   List<EmailAddress> filterEmailAddress(String emailAddressNotExist) {

model/test/extensions/email_address_extension_test.dart

@@ -0,0 +1,39 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
+import 'package:model/extensions/email_address_extension.dart';
+
+void main() {
+  group('EmailAddressExtension::asFullStringWithLtGtCharacter::', () {
+    test('Should returns displayName and emailAddress formatted correctly', () {
+      final emailAddress = EmailAddress(
+        'john doe',
+        'john.doe@example.com',
+      );
+      expect(
+        emailAddress.asFullStringWithLtGtCharacter(),
+        'John Doe <john.doe@example.com>',
+      );
+    });
+
+    test('Should returns displayName capitalized when emailAddress is empty', () {
+      final emailAddress = EmailAddress(
+        'jane doe',
+        '',
+      );
+      expect(emailAddress.asFullStringWithLtGtCharacter(), 'Jane Doe');
+    });
+
+    test('Should returns emailAddress enclosed in <> when displayName is empty', () {
+      final emailAddress = EmailAddress(
+        '',
+        'jane.doe@example.com',
+      );
+      expect(emailAddress.asFullStringWithLtGtCharacter(), '<jane.doe@example.com>');
+    });
+
+    test('Should returns an empty string when both displayName and emailAddress are empty', () {
+      final emailAddress = EmailAddress('', '');
+      expect(emailAddress.asFullStringWithLtGtCharacter(), '');
+    });
+  });
+}

model/test/extensions/list_email_address_extension_test.dart

@@ -0,0 +1,46 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
+import 'package:model/extensions/list_email_address_extension.dart';
+
+void main() {
+  group('ListEmailAddressExtension::toEscapeHtmlString::', () {
+    test('Should returns empty string for null or empty list', () {
+      expect((<EmailAddress>{}).toEscapeHtmlString(', '), '');
+
+      Set<EmailAddress>? listEmails;
+      expect(listEmails.toEscapeHtmlString(', '), '');
+    });
+
+    test('Should returns joined HTML strings with separator', () {
+      final emails = {
+        EmailAddress('John Doe', 'john@example.com'),
+        EmailAddress('Jane Smith', 'jane@example.com'),
+      };
+      final result = emails.toEscapeHtmlString(' | ');
+
+      expect(result, 'John Doe &lt;john@example.com&gt; | Jane Smith &lt;jane@example.com&gt;');
+    });
+
+    test('Should handles displayName-only or email-only cases', () {
+      final emails = {
+        EmailAddress('John Doe', ''),
+        EmailAddress('', 'jane@example.com'),
+      };
+      final result = emails.toEscapeHtmlString(', ');
+
+      expect(result, 'John Doe, &lt;jane@example.com&gt;');
+    });
+  });
+
+  group('ListEmailAddressExtension::toEscapeHtmlStringUseCommaSeparator::', () {
+    test('Should uses ", " as separator', () {
+      final emails = {
+        EmailAddress('John Doe', 'john@example.com'),
+        EmailAddress('Jane Smith', 'jane@example.com'),
+      };
+      final result = emails.toEscapeHtmlStringUseCommaSeparator();
+
+      expect(result, 'John Doe &lt;john@example.com&gt;, Jane Smith &lt;jane@example.com&gt;');
+    });
+  });
+}