65 lines
1.7 KiB
Dart
65 lines
1.7 KiB
Dart
// lib/metadata/file_provider.dart
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import 'dart:io';
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import 'package:flutter/foundation.dart'; // ⭐ 添加
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import 'package:path_provider/path_provider.dart';
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import 'package:dio/dio.dart';
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import '../services/webdav_service.dart';
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abstract class FileProvider {
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Future<File?> getFile(String url);
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}
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class WebDAVFileProvider implements FileProvider {
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final Dio _dio = Dio();
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@override
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Future<File?> getFile(String url) async {
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try {
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// 1. 获取缓存目录
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final cacheDir = await getTemporaryDirectory();
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final cachePath = '${cacheDir.path}/metadata_${url.hashCode}.tmp';
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final cacheFile = File(cachePath);
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// 2. 如果缓存存在且未过期，直接返回
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if (await cacheFile.exists()) {
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final stat = await cacheFile.stat();
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// 缓存 1 小时内有效（86400 秒）
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if (DateTime.now().difference(stat.modified).inSeconds < 86400) {
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return cacheFile;
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}
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}
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// 3. 获取认证头
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final headers = await WebDAVService.instance.getAuthHeaders();
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if (headers.isEmpty) return null;
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// 4. 只下载前 1MB
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await _dio.download(
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url,
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cachePath,
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options: Options(
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headers: headers,
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receiveTimeout: const Duration(seconds: 10),
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sendTimeout: const Duration(seconds: 10),
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),
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);
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return cacheFile;
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} catch (e) {
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debugPrint('⚠️ [WebDAVFileProvider] download failed: $e');
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return null;
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}
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}
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}
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class LocalFileProvider implements FileProvider {
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@override
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Future<File?> getFile(String url) async {
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final file = File(url);
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if (await file.exists()) {
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return file;
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}
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return null;
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}
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}
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