QingTing-Player/lib/services/webdav_service.dart

import 'dart:convert';
import 'package:dio/dio.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:xml/xml.dart';

class WebDAVService {
  static const String _keyBaseUrl = 'webdav_base_url';
  static const String _keyUsername = 'webdav_username';
  static const String _keyPassword = 'webdav_password';

  static WebDAVService? _instance;
  static WebDAVService get instance => _instance ??= WebDAVService._();

  WebDAVService._();

  Dio? _dio;
  String? _baseUrl;
  String? _username;

  bool get isConnected => _dio != null;
  String? get baseUrl => _baseUrl;
  String? get username => _username;

  // 保存凭据
  Future<void> saveCredentials(
      String baseUrl, String username, String password) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_keyBaseUrl, baseUrl);
    await prefs.setString(_keyUsername, username);
    await prefs.setString(_keyPassword, password);

    _baseUrl = baseUrl;
    _username = username;
    _dio = Dio(BaseOptions(
      baseUrl: baseUrl,
      headers: {
        'Authorization':
            'Basic ${base64Encode(utf8.encode('$username:$password'))}',
      },
    ));
  }

  // 加载已保存的凭据
  Future<bool> loadCredentials() async {
    final prefs = await SharedPreferences.getInstance();
    final baseUrl = prefs.getString(_keyBaseUrl);
    final username = prefs.getString(_keyUsername);
    final password = prefs.getString(_keyPassword);

    if (baseUrl != null && username != null && password != null) {
      _baseUrl = baseUrl;
      _username = username;
      _dio = Dio(BaseOptions(
        baseUrl: baseUrl,
        headers: {
          'Authorization':
              'Basic ${base64Encode(utf8.encode('$username:$password'))}',
        },
      ));
      return true;
    }
    return false;
  }

  // 清除凭据
  Future<void> clearCredentials() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove(_keyBaseUrl);
    await prefs.remove(_keyUsername);
    await prefs.remove(_keyPassword);
    _dio = null;
    _baseUrl = null;
    _username = null;
  }

  // 获取音乐文件列表（通过 PROPFIND）
  Future<List<WebDAVFileItem>> getMusicFiles({String path = '/'}) async {
    if (_dio == null) throw Exception('WebDAV 未连接');

    // PROPFIND 请求体（Depth: 1 表示获取子项）
    final body = '''
<?xml version="1.0" encoding="utf-8"?>
<propfind xmlns="DAV:">
  <prop>
    <resourcetype/>
    <getcontentlength/>
    <getlastmodified/>
  </prop>
</propfind>
    ''';

    final response = await _dio!.request(
      path,
      options: Options(
        method: 'PROPFIND',
        headers: {
          'Depth': '1',
          'Content-Type': 'application/xml; charset=utf-8',
        },
      ),
      data: body,
    );

    if (response.statusCode != 207) {
      throw Exception('WebDAV 响应异常: ${response.statusCode}');
    }

    final xml = XmlDocument.parse(response.data as String);
    final musicExtensions = ['.mp3', '.flac', '.m4a', '.ape', '.wav', '.opus'];

    final items = <WebDAVFileItem>[];

    // 查找所有响应项
    for (final responseNode in xml.findAllElements('response')) {
      final hrefNode = responseNode.findElements('href').firstOrNull;
      if (hrefNode == null) continue;

      String fullPath = Uri.decodeComponent(hrefNode.text.trim());
      // 去掉 baseUrl 前缀，得到相对路径
      String relativePath = fullPath;
      if (_baseUrl != null) {
        final baseUri = Uri.parse(_baseUrl!);
        final fullUri = Uri.parse(fullPath);
        relativePath = fullUri.path;
        if (baseUri.path.isNotEmpty && relativePath.startsWith(baseUri.path)) {
          relativePath = relativePath.substring(baseUri.path.length);
        }
      }
      if (relativePath.isEmpty || relativePath == '/') continue;

      // 检查是否是文件（非集合）
      final resTypeNode = responseNode.findElements('resourcetype').firstOrNull;
      final isCollection =
          resTypeNode?.findElements('collection').isNotEmpty ?? false;
      if (isCollection) continue;

      // 检查扩展名
      final fileName = relativePath.split('/').last;
      if (!musicExtensions.any((ext) => fileName.toLowerCase().endsWith(ext)))
        continue;

      // 获取文件大小和修改时间
      int? size;
      DateTime? modified;
      final sizeNode =
          responseNode.findElements('getcontentlength').firstOrNull;
      if (sizeNode != null) {
        size = int.tryParse(sizeNode.text);
      }
      final modifiedNode =
          responseNode.findElements('getlastmodified').firstOrNull;
      if (modifiedNode != null) {
        try {
          modified = DateTime.parse(modifiedNode.text);
        } catch (_) {}
      }

      items.add(WebDAVFileItem(
        path: relativePath,
        name: fileName,
        size: size,
        modified: modified,
      ));
    }

    return items;
  }

  // 获取文件的完整 URL
  String getFileUrl(String path) {
    if (_baseUrl == null) throw Exception('WebDAV 未配置');
    final base = _baseUrl!.endsWith('/') ? _baseUrl! : '$_baseUrl/';
    final cleanPath = path.startsWith('/') ? path.substring(1) : path;
    return '$base$cleanPath';
  }
}

class WebDAVFileItem {
  final String path;
  final String name;
  final int? size;
  final DateTime? modified;

  WebDAVFileItem({
    required this.path,
    required this.name,
    this.size,
    this.modified,
  });
}