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86 lines
2.5 KiB
86 lines
2.5 KiB
import 'dart:convert';
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import 'dart:math';
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import 'package:cryptography/cryptography.dart';
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import 'package:flutter_dotenv/flutter_dotenv.dart';
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import '../../data/models/appconfig.dart';
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/// 生成加密评论页 URL（与 App Comment 服务端 SIGN_SECRET 一致）
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///
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/// [userId]、[packageName]、[appName]、[appVersion] 必填；[userName]、[lang] 可选。
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Future<String> buildCommentUrl({
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required String userId,
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String? userName,
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required String packageName,
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required String appName,
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required String appVersion,
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String lang = 'en',
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}) async {
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final signSecret = _commentSignSecret();
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var commentServer = _commentServerUrl();
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if (signSecret.isEmpty || commentServer.isEmpty) {
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throw Exception(
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'COMMENT_SIGN_SECRET / COMMENT_SERVER_URL 未配置：'
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'请在 getAppConfig 的 env 中下发，或在 .env 中填写（本地调试）',
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);
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}
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commentServer = commentServer.trim().replaceAll(RegExp(r'/$'), '');
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final payload = {
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'userId': userId,
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'userName': userName ?? userId,
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'packageName': packageName,
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'appName': appName,
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'appVersion': appVersion,
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'lang': lang,
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'ts': DateTime.now().millisecondsSinceEpoch ~/ 1000,
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'nonce': _randomHex(8),
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};
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final algo = AesGcm.with256bits();
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final key = await algo.newSecretKeyFromBytes(_hexDecode(signSecret));
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final nonce = algo.newNonce();
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final box = await algo.encrypt(
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utf8.encode(jsonEncode(payload)),
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secretKey: key,
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nonce: nonce,
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);
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// 格式: iv(12 bytes) + tag(16 bytes) + ciphertext
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final blob = <int>[...nonce, ...box.mac.bytes, ...box.cipherText];
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final token = base64Url.encode(blob).replaceAll('=', '');
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return '$commentServer/?d=$token';
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}
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/// 优先使用服务端 [getAppConfig] 下发的 `env`，否则回退 `.env`（本地调试）。
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String _commentSignSecret() {
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if (AppConfig.isInitialized()) {
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final v = AppConfig.env('COMMENT_SIGN_SECRET');
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if (v != null && v.isNotEmpty) return v;
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}
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return dotenv.env['COMMENT_SIGN_SECRET'] ?? '';
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}
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String _commentServerUrl() {
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if (AppConfig.isInitialized()) {
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final v = AppConfig.env('COMMENT_SERVER_URL');
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if (v != null && v.isNotEmpty) return v;
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}
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return dotenv.env['COMMENT_SERVER_URL'] ?? '';
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}
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List<int> _hexDecode(String hex) => List.generate(
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hex.length ~/ 2,
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(i) => int.parse(hex.substring(i * 2, i * 2 + 2), radix: 16),
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);
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String _randomHex(int byteLen) {
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final r = Random.secure();
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return List.generate(
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byteLen,
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(_) => r.nextInt(256).toRadixString(16).padLeft(2, '0'),
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).join();
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}
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