自定义线路与线路优化

lib/services/download_service.dart

@@ -7,6 +7,7 @@ import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
 import '../core/constants/storage_keys.dart';
 import '../data/models/download_task_model.dart';
+import 'custom_line_service.dart';
 import 'file_service.dart';
 import 'storage_service.dart';
 import '../core/utils/app_logger.dart';
@@ -261,7 +262,14 @@ class DownloadService {
         await file.delete();
       }
 
-      return _startBdDownload(task, url, dir);
+      final route = await CustomLineService.instance.routeDownloadUrl(url);
+      if (route.changed) {
+        AppLogger.d(
+          '自定义线路下载代理已应用: node=${route.nodeName}, host=${route.originalHost}, proxy=${route.proxy?.proxyUri}',
+        );
+      }
+
+      return _startBdDownload(task, route.url, dir, headers: route.headers);
     } catch (e) {
       AppLogger.d('下载失败: $e');
       rethrow;
@@ -272,12 +280,15 @@ class DownloadService {
   Future<String?> _startBdDownload(
     DownloadTaskModel task,
     String url,
-    Directory dir,
-  ) async {
+    Directory dir, {
+    Map<String, String> headers = const {},
+  }) async {
+    await _configureCustomLineProxy();
     final wifiOnly = await isWifiOnlyEnabled();
     final retries = await getRetries();
     final bdTask = bd.DownloadTask(
       url: url,
+      headers: headers,
       filename: task.fileName,
       directory: dir.path,
       baseDirectory: bd.BaseDirectory.root,
@@ -340,10 +351,19 @@ class DownloadService {
       }
 
       // 恢复任务：不删除部分文件，使用 resume 方式重建 bdTask
+      final route = await CustomLineService.instance.routeDownloadUrl(url);
+      if (route.changed) {
+        AppLogger.d(
+          '自定义线路下载代理已应用: node=${route.nodeName}, host=${route.originalHost}, proxy=${route.proxy?.proxyUri}',
+        );
+      }
+
+      await _configureCustomLineProxy();
       final wifiOnly = await isWifiOnlyEnabled();
       final retries = await getRetries();
       final bdTask = bd.DownloadTask(
-        url: url,
+        url: route.url,
+        headers: route.headers,
         filename: task.fileName,
         directory: dir.path,
         baseDirectory: bd.BaseDirectory.root,
@@ -382,6 +402,14 @@ class DownloadService {
     }
   }
 
+  Future<void> _configureCustomLineProxy() async {
+    final endpoint = CustomLineService.instance.currentProxyEndpoint;
+    final config = endpoint == null ? false : (endpoint.host, endpoint.port);
+    await bd.FileDownloader().configure(
+      globalConfig: (bd.Config.proxy, config),
+    );
+  }
+
   /// 暂停下载
   Future<void> pauseDownload(String taskId) async {
     final bdTask = _bdTasks[taskId];