Refactor common code between add and rename accounts.

lib/core/models.dart

@@ -18,3 +18,8 @@ class Version with _$Version {
     return '$major.$minor.$patch';
   }
 }
+
+@freezed
+class Pair<T1, T2> with _$Pair<T1, T2> {
+  factory Pair(T1 first, T2 second) = _Pair<T1, T2>;
+}

lib/core/models.freezed.dart

@@ -168,3 +168,147 @@ abstract class _Version extends Version {
   _$VersionCopyWith<_Version> get copyWith =>
       throw _privateConstructorUsedError;
 }
+
+/// @nodoc
+class _$PairTearOff {
+  const _$PairTearOff();
+
+  _Pair<T1, T2> call<T1, T2>(T1 first, T2 second) {
+    return _Pair<T1, T2>(
+      first,
+      second,
+    );
+  }
+}
+
+/// @nodoc
+const $Pair = _$PairTearOff();
+
+/// @nodoc
+mixin _$Pair<T1, T2> {
+  T1 get first => throw _privateConstructorUsedError;
+  T2 get second => throw _privateConstructorUsedError;
+
+  @JsonKey(ignore: true)
+  $PairCopyWith<T1, T2, Pair<T1, T2>> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $PairCopyWith<T1, T2, $Res> {
+  factory $PairCopyWith(Pair<T1, T2> value, $Res Function(Pair<T1, T2>) then) =
+      _$PairCopyWithImpl<T1, T2, $Res>;
+  $Res call({T1 first, T2 second});
+}
+
+/// @nodoc
+class _$PairCopyWithImpl<T1, T2, $Res> implements $PairCopyWith<T1, T2, $Res> {
+  _$PairCopyWithImpl(this._value, this._then);
+
+  final Pair<T1, T2> _value;
+  // ignore: unused_field
+  final $Res Function(Pair<T1, T2>) _then;
+
+  @override
+  $Res call({
+    Object? first = freezed,
+    Object? second = freezed,
+  }) {
+    return _then(_value.copyWith(
+      first: first == freezed
+          ? _value.first
+          : first // ignore: cast_nullable_to_non_nullable
+              as T1,
+      second: second == freezed
+          ? _value.second
+          : second // ignore: cast_nullable_to_non_nullable
+              as T2,
+    ));
+  }
+}
+
+/// @nodoc
+abstract class _$PairCopyWith<T1, T2, $Res>
+    implements $PairCopyWith<T1, T2, $Res> {
+  factory _$PairCopyWith(
+          _Pair<T1, T2> value, $Res Function(_Pair<T1, T2>) then) =
+      __$PairCopyWithImpl<T1, T2, $Res>;
+  @override
+  $Res call({T1 first, T2 second});
+}
+
+/// @nodoc
+class __$PairCopyWithImpl<T1, T2, $Res> extends _$PairCopyWithImpl<T1, T2, $Res>
+    implements _$PairCopyWith<T1, T2, $Res> {
+  __$PairCopyWithImpl(_Pair<T1, T2> _value, $Res Function(_Pair<T1, T2>) _then)
+      : super(_value, (v) => _then(v as _Pair<T1, T2>));
+
+  @override
+  _Pair<T1, T2> get _value => super._value as _Pair<T1, T2>;
+
+  @override
+  $Res call({
+    Object? first = freezed,
+    Object? second = freezed,
+  }) {
+    return _then(_Pair<T1, T2>(
+      first == freezed
+          ? _value.first
+          : first // ignore: cast_nullable_to_non_nullable
+              as T1,
+      second == freezed
+          ? _value.second
+          : second // ignore: cast_nullable_to_non_nullable
+              as T2,
+    ));
+  }
+}
+
+/// @nodoc
+
+class _$_Pair<T1, T2> implements _Pair<T1, T2> {
+  _$_Pair(this.first, this.second);
+
+  @override
+  final T1 first;
+  @override
+  final T2 second;
+
+  @override
+  String toString() {
+    return 'Pair<$T1, $T2>(first: $first, second: $second)';
+  }
+
+  @override
+  bool operator ==(dynamic other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _Pair<T1, T2> &&
+            const DeepCollectionEquality().equals(other.first, first) &&
+            const DeepCollectionEquality().equals(other.second, second));
+  }
+
+  @override
+  int get hashCode => Object.hash(
+      runtimeType,
+      const DeepCollectionEquality().hash(first),
+      const DeepCollectionEquality().hash(second));
+
+  @JsonKey(ignore: true)
+  @override
+  _$PairCopyWith<T1, T2, _Pair<T1, T2>> get copyWith =>
+      __$PairCopyWithImpl<T1, T2, _Pair<T1, T2>>(this, _$identity);
+}
+
+abstract class _Pair<T1, T2> implements Pair<T1, T2> {
+  factory _Pair(T1 first, T2 second) = _$_Pair<T1, T2>;
+
+  @override
+  T1 get first;
+  @override
+  T2 get second;
+  @override
+  @JsonKey(ignore: true)
+  _$PairCopyWith<T1, T2, _Pair<T1, T2>> get copyWith =>
+      throw _privateConstructorUsedError;
+}

lib/oath/models.freezed.dart

@@ -837,11 +837,11 @@ class _$CredentialDataTearOff {
       {String? issuer,
       required String name,
       required String secret,
-      OathType oathType = OathType.totp,
-      HashAlgorithm hashAlgorithm = HashAlgorithm.sha1,
-      int digits = 6,
-      int period = 30,
-      int counter = 0}) {
+      OathType oathType = defaultOathType,
+      HashAlgorithm hashAlgorithm = defaultHashAlgorithm,
+      int digits = defaultDigits,
+      int period = defaultPeriod,
+      int counter = defaultCounter}) {
     return _CredentialData(
       issuer: issuer,
       name: name,
@@ -1036,11 +1036,11 @@ class _$_CredentialData extends _CredentialData {
       {this.issuer,
       required this.name,
       required this.secret,
-      this.oathType = OathType.totp,
-      this.hashAlgorithm = HashAlgorithm.sha1,
-      this.digits = 6,
-      this.period = 30,
-      this.counter = 0})
+      this.oathType = defaultOathType,
+      this.hashAlgorithm = defaultHashAlgorithm,
+      this.digits = defaultDigits,
+      this.period = defaultPeriod,
+      this.counter = defaultCounter})
       : super._();
 
   factory _$_CredentialData.fromJson(Map<String, dynamic> json) =>

lib/oath/models.g.dart

@@ -65,13 +65,13 @@ _$_CredentialData _$$_CredentialDataFromJson(Map<String, dynamic> json) =>
       name: json['name'] as String,
       secret: json['secret'] as String,
       oathType: $enumDecodeNullable(_$OathTypeEnumMap, json['oath_type']) ??
-          OathType.totp,
+          defaultOathType,
       hashAlgorithm:
           $enumDecodeNullable(_$HashAlgorithmEnumMap, json['hash_algorithm']) ??
-              HashAlgorithm.sha1,
-      digits: json['digits'] as int? ?? 6,
-      period: json['period'] as int? ?? 30,
-      counter: json['counter'] as int? ?? 0,
+              defaultHashAlgorithm,
+      digits: json['digits'] as int? ?? defaultDigits,
+      period: json['period'] as int? ?? defaultPeriod,
+      counter: json['counter'] as int? ?? defaultCounter,
     );
 
 Map<String, dynamic> _$$_CredentialDataToJson(_$_CredentialData instance) =>

lib/oath/views/add_account_page.dart

@@ -8,6 +8,7 @@ import 'package:yubico_authenticator/oath/models.dart';
 import '../../app/state.dart';
 import '../../app/models.dart';
 import '../state.dart';
+import 'utils.dart';
 
 final _secretFormatterPattern =
     RegExp('[abcdefghijklmnopqrstuvwxyz234567 ]', caseSensitive: false);
@@ -33,17 +34,14 @@ class _AddAccountFormState extends State<AddAccountForm> {
 
   @override
   Widget build(BuildContext context) {
-    int remaining = 64; // 64 bytes are shared between issuer and name.
-    if (_oathType == OathType.totp && _period != defaultPeriod) {
-      // Non-standard periods are stored as part of this data, as a "D/"- prefix.
-      remaining -= '$_period/'.length;
-    }
-    if (_issuer.isNotEmpty) {
-      // Issuer is separated from name with a ":", if present.
-      remaining -= 1;
-    }
-    final issuerRemaining = remaining - max<int>(_account.length, 1);
-    final nameRemaining = remaining - _issuer.length;
+    final remaining = getRemainingKeySpace(
+      oathType: _oathType,
+      period: _period,
+      issuer: _issuer,
+      name: _account,
+    );
+    final issuerRemaining = remaining.first;
+    final nameRemaining = remaining.second;
 
     final secretValid = _secret.length * 5 % 8 < 5;
     final isValid =
@@ -57,7 +55,7 @@ class _AddAccountFormState extends State<AddAccountForm> {
             children: [
               TextField(
                 enabled: issuerRemaining > 0,
-                maxLength: issuerRemaining > 0 ? issuerRemaining : null,
+                maxLength: max(issuerRemaining, 1),
                 decoration: const InputDecoration(
                   labelText: 'Issuer (optional)',
                   helperText:
@@ -65,13 +63,12 @@ class _AddAccountFormState extends State<AddAccountForm> {
                 ),
                 onChanged: (value) {
                   setState(() {
-                    _issuer = value;
+                    _issuer = value.trim();
                   });
                 },
               ),
-              TextFormField(
-                enabled: nameRemaining > 0,
-                maxLength: nameRemaining > 0 ? nameRemaining : null,
+              TextField(
+                maxLength: nameRemaining,
                 decoration: const InputDecoration(
                   labelText: 'Account name',
                   helperText:
@@ -79,11 +76,11 @@ class _AddAccountFormState extends State<AddAccountForm> {
                 ),
                 onChanged: (value) {
                   setState(() {
-                    _account = value;
+                    _account = value.trim();
                   });
                 },
               ),
-              TextFormField(
+              TextField(
                 inputFormatters: <TextInputFormatter>[
                   FilteringTextInputFormatter.allow(_secretFormatterPattern)
                 ],

lib/oath/views/rename_account_dialog.dart

@@ -1,5 +1,3 @@
-import 'dart:math';
-
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
@@ -7,6 +5,7 @@ import '../models.dart';
 import '../state.dart';
 import '../../app/models.dart';
 import '../../app/state.dart';
+import 'utils.dart';
 
 class RenameAccountDialog extends ConsumerStatefulWidget {
   final DeviceNode device;
@@ -20,16 +19,15 @@ class RenameAccountDialog extends ConsumerStatefulWidget {
 }
 
 class _RenameAccountDialogState extends ConsumerState<RenameAccountDialog> {
-  late TextEditingController _issuerController;
-  late TextEditingController _nameController;
+  late String _issuer;
+  late String _account;
   _RenameAccountDialogState();
 
   @override
   void initState() {
     super.initState();
-    _issuerController =
-        TextEditingController(text: widget.credential.issuer ?? '');
-    _nameController = TextEditingController(text: widget.credential.name);
+    _issuer = widget.credential.issuer ?? '';
+    _account = widget.credential.name;
   }
 
   @override
@@ -45,20 +43,15 @@ class _RenameAccountDialogState extends ConsumerState<RenameAccountDialog> {
         ? '${credential.issuer} (${credential.name})'
         : credential.name;
 
-    int remaining = 64; // 64 bytes are shared between issuer and name.
-    if (credential.oathType == OathType.totp &&
-        credential.period != defaultPeriod) {
-      // Non-standard periods are stored as part of this data, as a "D/"- prefix.
-      remaining -= '${credential.period}/'.length;
-    }
-    if (_issuerController.text.isNotEmpty) {
-      // Issuer is separated from name with a ":", if present.
-      remaining -= 1;
-    }
-    final issuerRemaining =
-        remaining - max<int>(_nameController.text.length, 1);
-    final nameRemaining = remaining - _issuerController.text.length;
-    final isValid = _nameController.text.trim().isNotEmpty;
+    final remaining = getRemainingKeySpace(
+      oathType: credential.oathType,
+      period: credential.period,
+      issuer: _issuer,
+      name: _account,
+    );
+    final issuerRemaining = remaining.first;
+    final nameRemaining = remaining.second;
+    final isValid = _account.isNotEmpty;
 
     return AlertDialog(
       title: Text('Rename $label?'),
@@ -67,29 +60,32 @@ class _RenameAccountDialogState extends ConsumerState<RenameAccountDialog> {
         children: [
           const Text(
               'This will change how the account is displayed in the list.'),
-          TextField(
-            controller: _issuerController,
+          TextFormField(
+            initialValue: _issuer,
             enabled: issuerRemaining > 0,
             maxLength: issuerRemaining > 0 ? issuerRemaining : null,
             decoration: const InputDecoration(
-              labelText: 'Issuer',
+              labelText: 'Issuer (optional)',
               helperText: '', // Prevents dialog resizing when enabled = false
             ),
             onChanged: (value) {
-              setState(() {}); // Update maxLength
+              setState(() {
+                _issuer = value.trim();
+              });
             },
           ),
-          TextField(
-            controller: _nameController,
-            enabled: nameRemaining > 0,
-            maxLength: nameRemaining > 0 ? nameRemaining : null,
+          TextFormField(
+            initialValue: _account,
+            maxLength: nameRemaining,
             decoration: InputDecoration(
-              labelText: 'Account name *',
+              labelText: 'Account name',
               helperText: '', // Prevents dialog resizing when enabled = false
               errorText: isValid ? null : 'Your account must have a name',
             ),
             onChanged: (value) {
-              setState(() {}); // Update maxLength, isValid
+              setState(() {
+                _account = value.trim();
+              });
             },
           ),
         ],
@@ -104,12 +100,10 @@ class _RenameAccountDialogState extends ConsumerState<RenameAccountDialog> {
         ElevatedButton(
           onPressed: isValid
               ? () async {
-                  final issuer = _issuerController.text.trim();
-                  final name = _nameController.text.trim();
                   await ref
                       .read(credentialListProvider(widget.device.path).notifier)
-                      .renameAccount(
-                          credential, issuer.isNotEmpty ? issuer : null, name);
+                      .renameAccount(credential,
+                          _issuer.isNotEmpty ? _issuer : null, _account);
                   Navigator.of(context).pop();
                   ScaffoldMessenger.of(context).showSnackBar(
                     const SnackBar(

lib/oath/views/utils.dart

@@ -0,0 +1,32 @@
+import 'dart:math';
+
+import '../models.dart';
+import '../../core/models.dart';
+
+/// Calculates the available space for issuer and account name.
+///
+/// Returns a [Pair] of the space available for the issuer and account name,
+/// respectively, based on the current state of the credential.
+Pair<int, int> getRemainingKeySpace(
+    {required OathType oathType,
+    required int period,
+    required String issuer,
+    required String name}) {
+  int remaining = 64; // The field is 64 bytes in total.
+
+  if (oathType == OathType.totp && period != defaultPeriod) {
+    // Non-standard TOTP periods are stored as part of this data, as a "D/"- prefix.
+    remaining -= '$period/'.length;
+  }
+  int issuerSpace = issuer.length;
+  if (issuer.isNotEmpty) {
+    // Issuer is separated from name with a ":", if present.
+    issuerSpace += 1;
+  }
+
+  return Pair(
+    // Always reserve at least one character for name
+    remaining - 1 - max(name.length, 1),
+    remaining - issuerSpace,
+  );
+}