97 lines
3.3 KiB
Dart
97 lines
3.3 KiB
Dart
// 全局昵称设置
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// 持久化到 SharedPreferences / localStorage，所有工具共享同一个昵称
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// Web 平台自动监听 localStorage 变化 → 跨标签页实时同步
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import 'dart:async';
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import 'dart:html' as html show window, StorageEvent;
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import 'package:flutter/foundation.dart' show kIsWeb;
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import 'package:shared_preferences/shared_preferences.dart';
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const _keyNickname = 'toolbox.nickname';
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const _keyBrowserId = 'toolbox.browser_id';
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class NicknameService {
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NicknameService._();
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static final NicknameService instance = NicknameService._();
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SharedPreferences? _prefs;
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/// 浏览器唯一 ID：同浏览器跨 tab 共享（localStorage 作用域），跨浏览器不同
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/// 用于后端识别"同一个人"，避免昵称冲突时自动改名
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String? _browserId;
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/// 昵称变化广播流：本地 setNickname 触发 + Web 上其他标签页修改也触发
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final _streamController = StreamController<String>.broadcast();
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Stream<String> get onChanged => _streamController.stream;
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StreamSubscription? _webStorageSub;
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Future<void> _ensureInit() async {
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_prefs ??= await SharedPreferences.getInstance();
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// 惰性生成 browserId：首次访问时若没有就生成 uuid 存起来
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if (_browserId == null) {
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final existing = _prefs!.getString(_keyBrowserId);
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if (existing != null && existing.isNotEmpty) {
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_browserId = existing;
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} else {
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_browserId = _genBrowserId();
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await _prefs!.setString(_keyBrowserId, _browserId!);
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}
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}
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}
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/// 获取浏览器 ID（稳定值，同浏览器跨 tab 相同）
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Future<String> get browserId async {
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await _ensureInit();
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return _browserId!;
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}
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/// 生成短 browserId：base62（0-9A-Za-z），去掉特殊字符方便 URL 使用
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/// 12 字符足够唯一（62^12 ≈ 3e21 种可能）
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String _genBrowserId() {
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const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
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final rand = DateTime.now().microsecond.hashCode;
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final buf = StringBuffer();
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int seed = rand ^ DateTime.now().millisecondsSinceEpoch;
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for (int i = 0; i < 12; i++) {
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seed = (seed * 1103515245 + 12345) & 0x7FFFFFFF;
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buf.write(chars[seed % chars.length]);
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}
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return buf.toString();
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}
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/// 开启跨标签页同步（仅 Web 生效；非 Web 空操作）
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/// 在 widget 的 initState 里调用一次即可
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void enableCrossTabSync() {
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if (!kIsWeb || _webStorageSub != null) return;
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_webStorageSub = html.window.onStorage.listen((html.StorageEvent event) async {
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if (event.key == _keyNickname) {
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final n = await nickname;
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_streamController.add(n);
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}
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});
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}
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/// 获取当前昵称，未设置时返回默认昵称
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Future<String> get nickname async {
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await _ensureInit();
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final n = _prefs!.getString(_keyNickname);
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if (n != null && n.trim().isNotEmpty) return n.trim();
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return '用户';
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}
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/// 设置昵称（1-32 字符，过短返回 false）
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Future<bool> setNickname(String value) async {
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final trimmed = value.trim();
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if (trimmed.isEmpty || trimmed.length > 32) return false;
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await _ensureInit();
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await _prefs!.setString(_keyNickname, trimmed);
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_streamController.add(trimmed);
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return true;
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}
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void dispose() {
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_webStorageSub?.cancel();
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_webStorageSub = null;
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}
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}
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