120 lines
4.4 KiB
Dart
120 lines
4.4 KiB
Dart
import 'dart:io';
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import 'package:dio/dio.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter_cache_manager/flutter_cache_manager.dart';
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import 'package:http/http.dart';
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import 'package:path/path.dart' as path;
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import 'package:path_provider/path_provider.dart';
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import '../../config/address.dart';
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import '../../extension/extensions.dart';
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import '../debug_log.dart';
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import '../image/image_data_handle/image_crypto.dart';
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import '../net/load_apk/dio_cli.dart';
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class ImageCacheManager extends CacheManager {
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static const image_key = "customCache";
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// 工厂模式
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factory ImageCacheManager() => _getInstance();
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static ImageCacheManager get instance => _getInstance();
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static ImageCacheManager? _instance;
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static ImageCacheManager _getInstance() {
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_instance ??= ImageCacheManager._internal();
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return _instance!;
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}
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ImageCacheManager._internal()
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: super(Config(image_key, maxNrOfCacheObjects: 400, stalePeriod: const Duration(days: 7), fileService: CustomFileRespons()));
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Future<String> getFilePath() async {
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var directory = await getTemporaryDirectory();
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return path.join(directory.path, image_key);
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}
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}
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class CustomFileRespons extends HttpFileService {
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DioCli client = DioCli(
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options: BaseOptions(
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connectTimeout: const Duration(milliseconds: 30000),
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receiveTimeout: const Duration(milliseconds: 30000),
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sendTimeout: const Duration(milliseconds: 30000),
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validateStatus: (int? status) {
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if (status != null) return status < 600;
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return false;
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}));
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@override
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Future<FileServiceResponse> get(String url, {Map<String, String>? headers = const {}}) async {
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if (!url.startsWith("http") && !url.startsWith("https")) {
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url = path.join(Address.baseImagePath ?? '', url);
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}
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if (kDebugMode) {
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debugLog("image_request", "get()...begin...ulr:$url...");
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}
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headers?['cache-control'] = 'max-age=31104000';
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final resp = await client.getBytes(url, headers: headers);
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final statusCode = resp.data?.statusCode ?? HttpStatus.badRequest;
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// 失败 / 非 2xx：直接抛。避免错误响应(空内容、CDN 错误页)被落盘缓存成坏图，
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// 让 CachedNetworkImage 走 errorWidget；下次能重新请求，而不是一直命中坏缓存。
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if (resp.err != null || statusCode < 200 || statusCode >= 300) {
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if (kDebugMode) {
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debugLog("image_request", "get()...failed...$url...code:($statusCode): ${resp.err}");
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}
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throw HttpException("image fetch failed ($statusCode): ${resp.err}", uri: Uri.tryParse(url));
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}
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// 解密(Dio 不同版本 bytes 返回 List<int> 或 Uint8List)。解密失败 / 空字节同样抛出，不缓存坏图。
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Uint8List bytes;
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try {
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final raw = resp.data?.data;
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final decrypted = raw == null ? null : ImageCrypto.decryptImage(raw is Uint8List ? raw : Uint8List.fromList(raw));
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if (decrypted == null || decrypted.isEmpty) {
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throw const FormatException("empty image bytes");
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}
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//部分 CDN 返回的加密 JPEG 缺末尾 EOI(FF D9)，Skia 严格 decoder 会拒；补 EOI 让标准 decoder 也能解
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bytes = _repairJpegEoiIfNeeded(decrypted);
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} catch (e) {
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if (kDebugMode) debugLog("ImageCacheManager", "decrypt failed: $url -> $e");
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throw HttpException("image decrypt failed: $e", uri: Uri.tryParse(url));
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}
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final respHeaders = <String, String>{};
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resp.data?.headers.forEach((key, arrayValue) {
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if (arrayValue.notEmpty()) respHeaders[key] = arrayValue[0];
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});
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if (kDebugMode) {
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debugLog("image_request", "get()...success...$url...code:($statusCode): contentLength:${bytes.length}");
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}
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return HttpGetResponse(StreamedResponse(
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Stream.value(bytes),
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statusCode,
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contentLength: bytes.length, // 补 EOI 后用真实长度
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headers: respHeaders,
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));
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}
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}
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//判断是 jpeg 头但无 FF D9 结尾时补 EOI；其他格式 / 已完整 jpeg 原样返回
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Uint8List _repairJpegEoiIfNeeded(Uint8List bytes) {
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if (bytes.length < 4) return bytes;
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final isJpeg = bytes[0] == 0xFF && bytes[1] == 0xD8 && bytes[2] == 0xFF;
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if (!isJpeg) return bytes;
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final hasEoi = bytes[bytes.length - 2] == 0xFF && bytes[bytes.length - 1] == 0xD9;
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if (hasEoi) return bytes;
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final fixed = Uint8List(bytes.length + 2)
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..setRange(0, bytes.length, bytes)
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..[bytes.length] = 0xFF
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..[bytes.length + 1] = 0xD9;
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return fixed;
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}
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