初始化

2026-09-15 15:44:13 +07:00
commit a23ba685e9
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+import 'dart:io';
+
+import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+import 'package:http/http.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
+
+import '../../config/address.dart';
+import '../../extension/extensions.dart';
+import '../debug_log.dart';
+import '../image/image_data_handle/image_crypto.dart';
+import '../net/load_apk/dio_cli.dart';
+
+class ImageCacheManager extends CacheManager {
+  static const image_key = "customCache";
+
+// 工厂模式
+  factory ImageCacheManager() => _getInstance();
+
+  static ImageCacheManager get instance => _getInstance();
+  static ImageCacheManager? _instance;
+
+  static ImageCacheManager _getInstance() {
+    _instance ??= ImageCacheManager._internal();
+    return _instance!;
+  }
+
+  ImageCacheManager._internal()
+      : super(Config(image_key, maxNrOfCacheObjects: 400, stalePeriod: const Duration(days: 7), fileService: CustomFileRespons()));
+
+  Future<String> getFilePath() async {
+    var directory = await getTemporaryDirectory();
+    return path.join(directory.path, image_key);
+  }
+}
+
+class CustomFileRespons extends HttpFileService {
+  DioCli client = DioCli(
+      options: BaseOptions(
+          connectTimeout: const Duration(milliseconds: 30000),
+          receiveTimeout: const Duration(milliseconds: 30000),
+          sendTimeout: const Duration(milliseconds: 30000),
+          validateStatus: (int? status) {
+            if (status != null) return status < 600;
+            return false;
+          }));
+
+  @override
+  Future<FileServiceResponse> get(String url, {Map<String, String>? headers = const {}}) async {
+    if (!url.startsWith("http") && !url.startsWith("https")) {
+      url = path.join(Address.baseImagePath ?? '', url);
+    }
+
+    if (kDebugMode) {
+      debugLog("image_request", "get()...begin...ulr:$url...");
+    }
+
+    headers?['cache-control'] = 'max-age=31104000';
+
+    final resp = await client.getBytes(url, headers: headers);
+    final statusCode = resp.data?.statusCode ?? HttpStatus.badRequest;
+
+    // 失败 / 非 2xx：直接抛。避免错误响应(空内容、CDN 错误页)被落盘缓存成坏图，
+    // 让 CachedNetworkImage 走 errorWidget；下次能重新请求，而不是一直命中坏缓存。
+    if (resp.err != null || statusCode < 200 || statusCode >= 300) {
+      if (kDebugMode) {
+        debugLog("image_request", "get()...failed...$url...code:($statusCode): ${resp.err}");
+      }
+      throw HttpException("image fetch failed ($statusCode): ${resp.err}", uri: Uri.tryParse(url));
+    }
+
+    // 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。
+    Uint8List bytes;
+    try {
+      final raw = resp.data?.data;
+      final decrypted = raw == null ? null : ImageCrypto.decryptImage(raw is Uint8List ? raw : Uint8List.fromList(raw));
+      if (decrypted == null || decrypted.isEmpty) {
+        throw const FormatException("empty image bytes");
+      }
+      //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
+      bytes = _repairJpegEoiIfNeeded(decrypted);
+    } catch (e) {
+      if (kDebugMode) debugLog("ImageCacheManager", "decrypt failed: $url -> $e");
+      throw HttpException("image decrypt failed: $e", uri: Uri.tryParse(url));
+    }
+
+    final respHeaders = <String, String>{};
+    resp.data?.headers.forEach((key, arrayValue) {
+      if (arrayValue.notEmpty()) respHeaders[key] = arrayValue[0];
+    });
+
+    if (kDebugMode) {
+      debugLog("image_request", "get()...success...$url...code:($statusCode): contentLength:${bytes.length}");
+    }
+
+    return HttpGetResponse(StreamedResponse(
+      Stream.value(bytes),
+      statusCode,
+      contentLength: bytes.length, // 补 EOI 后用真实长度
+      headers: respHeaders,
+    ));
+  }
+}
+
+//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
+Uint8List _repairJpegEoiIfNeeded(Uint8List bytes) {
+  if (bytes.length < 4) return bytes;
+  final isJpeg = bytes[0] == 0xFF && bytes[1] == 0xD8 && bytes[2] == 0xFF;
+  if (!isJpeg) return bytes;
+  final hasEoi = bytes[bytes.length - 2] == 0xFF && bytes[bytes.length - 1] == 0xD9;
+  if (hasEoi) return bytes;
+  final fixed = Uint8List(bytes.length + 2)
+    ..setRange(0, bytes.length, bytes)
+    ..[bytes.length] = 0xFF
+    ..[bytes.length + 1] = 0xD9;
+  return fixed;
+}