yubioath-flutter/lib/oath/icon_provider/icon_cache.dart
Adam Velebil 9b39b5c391
use join
2023-02-23 16:38:03 +01:00

102 lines
3.0 KiB
Dart

/*
* Copyright (C) 2023 Yubico.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:logging/logging.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
import 'package:yubico_authenticator/app/logging.dart';
final _log = Logger('icon_cache');
class IconCacheFs {
Future<ByteData?> read(String fileName) async {
final file = await _getFile(fileName);
final exists = await file.exists();
if (exists) {
_log.debug('File $fileName exists in cache');
} else {
_log.debug('File $fileName does not exist in cache');
}
return exists ? (await file.readAsBytes()).buffer.asByteData() : null;
}
Future<void> write(String fileName, Uint8List data) async {
_log.debug('Writing $fileName to cache');
final file = await _getFile(fileName);
if (!await file.exists()) {
await file.create(recursive: true, exclusive: false);
}
await file.writeAsBytes(data, flush: true);
}
Future<void> clear() async {
final cacheDirectory = await _cacheDirectory;
if (await cacheDirectory.exists()) {
try {
await cacheDirectory.delete(recursive: true);
} catch (e) {
_log.error(
'Failed to delete cache directory ${cacheDirectory.path}', e);
}
}
}
String _buildCacheDirectoryPath(String supportDirectory) =>
join(supportDirectory, 'issuer_icons_cache');
Future<Directory> get _cacheDirectory async {
final supportDirectory = await getApplicationSupportDirectory();
return Directory(_buildCacheDirectoryPath(supportDirectory.path));
}
Future<File> _getFile(String fileName) async {
final supportDirectory = await getApplicationSupportDirectory();
final cacheDirectoryPath = _buildCacheDirectoryPath(supportDirectory.path);
return File(
join(cacheDirectoryPath, '${basenameWithoutExtension(fileName)}.dat'));
}
}
class IconCacheMem {
final _cache = <String, ByteData>{};
ByteData? read(String fileName) {
return _cache[fileName];
}
void write(String fileName, Uint8List data) {
_cache.putIfAbsent(fileName, () => data.buffer.asByteData());
}
void clear() async {
_cache.clear();
}
}
class IconCache {
final IconCacheMem memCache;
final IconCacheFs fsCache;
const IconCache(this.memCache, this.fsCache);
}
final iconCacheProvider =
Provider<IconCache>((ref) => IconCache(IconCacheMem(), IconCacheFs()));