mirror of
https://github.com/Yubico/yubioath-flutter.git
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50 lines
1.6 KiB
Dart
Executable File
50 lines
1.6 KiB
Dart
Executable File
/*
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* Copyright (C) 2022 Yubico.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import 'dart:math';
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import '../../widgets/utf8_utils.dart';
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import '../models.dart';
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import '../../core/models.dart';
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/// Calculates the available space for issuer and account name.
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///
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/// Returns a [Pair] of the space available for the issuer and account name,
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/// respectively, based on the current state of the credential.
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Pair<int, int> getRemainingKeySpace(
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{required OathType oathType,
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required int period,
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required String issuer,
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required String name}) {
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int remaining = 64; // The field is 64 bytes in total.
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if (oathType == OathType.totp && period != defaultPeriod) {
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// Non-standard TOTP periods are stored as part of this data, as a "D/"- prefix.
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remaining -= '$period/'.length;
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}
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int issuerSpace = byteLength(issuer);
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if (issuer.isNotEmpty) {
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// Issuer is separated from name with a ":", if present.
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issuerSpace += 1;
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}
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return Pair(
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// Always reserve at least one character for name
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remaining - 1 - max(byteLength(name), 1),
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remaining - issuerSpace,
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);
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}
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