151 lines
3.4 KiB
Dart
151 lines
3.4 KiB
Dart
/// OSS配置提供者接口
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///
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/// 定义获取OSS配置信息的标准接口，支持动态配置和静态配置
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abstract class ConfigProvider {
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/// 获取OSS端点
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Future<String> getEndpoint();
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/// 获取存储桶名称
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Future<String> getBucketName();
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/// 获取上传目录前缀
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Future<String> getDirectory();
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/// 获取访问域名
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/// 如果为null，则使用默认的 https://{bucket}.{endpoint}
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Future<String?> getDomain();
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/// 获取配置信息是否有效
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Future<bool> isValid();
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/// 刷新配置信息
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Future<void> refresh();
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}
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/// 静态配置提供者
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/// 使用固定的配置信息
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class StaticConfigProvider implements ConfigProvider {
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final String endpoint;
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final String bucketName;
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final String directory;
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final String? domain;
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const StaticConfigProvider({
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required this.endpoint,
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required this.bucketName,
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this.directory = 'uploads',
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this.domain,
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});
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@override
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Future<String> getEndpoint() async => endpoint;
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@override
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Future<String> getBucketName() async => bucketName;
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@override
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Future<String> getDirectory() async => directory;
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@override
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Future<String?> getDomain() async => domain;
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@override
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Future<bool> isValid() async => true;
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@override
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Future<void> refresh() async {
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// 静态配置不需要刷新
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}
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}
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/// 动态配置提供者
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/// 支持从服务端动态获取配置信息
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class DynamicConfigProvider implements ConfigProvider {
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OSSConfig? _config;
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DateTime? _lastUpdate;
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final Duration _cacheTimeout;
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final Future<OSSConfig> Function() _configGetter;
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DynamicConfigProvider({
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required Future<OSSConfig> Function() configGetter,
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Duration cacheTimeout = const Duration(hours: 1),
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}) : _configGetter = configGetter,
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_cacheTimeout = cacheTimeout;
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@override
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Future<String> getEndpoint() async {
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await _ensureConfig();
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return _config!.endpoint;
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}
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@override
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Future<String> getBucketName() async {
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await _ensureConfig();
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return _config!.bucketName;
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}
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@override
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Future<String> getDirectory() async {
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await _ensureConfig();
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return _config!.directory;
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}
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@override
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Future<String?> getDomain() async {
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await _ensureConfig();
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return _config!.domain;
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}
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@override
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Future<bool> isValid() async {
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if (_config == null || _lastUpdate == null) return false;
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return DateTime.now().difference(_lastUpdate!) < _cacheTimeout;
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}
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@override
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Future<void> refresh() async {
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_config = await _configGetter();
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_lastUpdate = DateTime.now();
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}
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/// 确保配置信息有效
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Future<void> _ensureConfig() async {
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if (!await isValid()) {
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await refresh();
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}
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}
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}
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/// OSS配置模型
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class OSSConfig {
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final String endpoint;
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final String bucketName;
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final String directory;
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final String? domain;
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const OSSConfig({
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required this.endpoint,
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required this.bucketName,
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this.directory = 'uploads',
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this.domain,
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});
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factory OSSConfig.fromJson(Map<String, dynamic> json) {
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return OSSConfig(
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endpoint: json['endpoint'] as String,
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bucketName: json['bucketName'] as String,
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directory: json['directory'] as String? ?? 'uploads',
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domain: json['domain'] as String?,
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);
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}
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Map<String, dynamic> toJson() {
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return {
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'endpoint': endpoint,
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'bucketName': bucketName,
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'directory': directory,
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if (domain != null) 'domain': domain,
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};
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}
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}
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