79 lines
2.3 KiB
Dart
79 lines
2.3 KiB
Dart
// ignore: avoid_web_libraries_in_flutter
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import 'dart:convert';
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// ignore: avoid_web_libraries_in_flutter
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import 'dart:html' as html;
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import 'package:crypto/crypto.dart';
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import 'package:analytics_sdk/utils/uuid_util.dart';
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const _kFingerprintKey = 'analytics_fp';
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/// Web 平台设备指纹生成
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///
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/// **生成规则**
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/// 1. 收集宿主 App 传入字段（device、deviceBrand、deviceModel、systemName、
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/// systemVersion、userAgent）及浏览器环境信息（屏幕分辨率、语言、时区），
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/// 过滤空值后用 `|` 拼接，做 SHA-256 生成指纹。
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/// 2. 若所有因子均为空，降级生成 UUID v4 并写入 localStorage，后续复用。
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///
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/// 任何异常均返回空字符串，不影响正常上报。
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Future<String> generateOrLoadFingerprint({
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String deviceId = '',
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String device = '',
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String deviceBrand = '',
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String deviceModel = '',
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String systemName = '',
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String systemVersion = '',
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String userAgent = '',
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}) async {
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try {
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final envFactors = _collectBrowserEnv();
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final factors = [
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device, deviceBrand, deviceModel,
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systemName, systemVersion,
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userAgent,
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...envFactors,
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].where((f) => f.isNotEmpty).toList();
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if (factors.isNotEmpty) {
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final digest = sha256.convert(utf8.encode(factors.join('|')));
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return digest.toString();
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}
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// 所有因子为空时降级为持久化 UUID v4
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final storage = html.window.localStorage;
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final existing = storage[_kFingerprintKey] ?? '';
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if (existing.isNotEmpty) return existing;
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final fp = generateUuidV4();
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storage[_kFingerprintKey] = fp;
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return fp;
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} catch (_) {
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return '';
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}
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}
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/// 收集浏览器环境因子：屏幕分辨率、语言、时区
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List<String> _collectBrowserEnv() {
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final factors = <String>[];
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try {
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final screen = html.window.screen;
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if (screen != null) {
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final w = screen.width;
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final h = screen.height;
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if (w != null && h != null && w > 0 && h > 0) {
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factors.add('${w}x$h');
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}
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}
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} catch (_) {}
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try {
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final lang = html.window.navigator.language;
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if (lang.isNotEmpty) factors.add(lang);
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} catch (_) {}
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try {
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final tz = DateTime.now().timeZoneName;
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if (tz.isNotEmpty) factors.add(tz);
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} catch (_) {}
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return factors;
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}
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