92 lines
2.4 KiB
Dart
92 lines
2.4 KiB
Dart
// ignore_for_file: constant_identifier_names
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import 'dart:convert';
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import 'dart:math';
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import 'package:flutter/material.dart';
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class IdUtils {
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static const String TABLE =
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'fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF';
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static const List<int> S = [11, 10, 3, 8, 4, 6]; // 位置编码表
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static const int XOR = 177451812; // 固定异或值
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static const int ADD = 8728348608; // 固定加法值
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static const List<String> r = [
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'B',
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'V',
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'1',
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'',
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'',
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'4',
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'',
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'1',
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'',
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'7',
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'',
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''
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];
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/// av转bv
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static String av2bv(int av) {
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int x_ = (av ^ XOR) + ADD;
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List<String> newR = [];
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newR.addAll(r);
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for (int i = 0; i < S.length; i++) {
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newR[S[i]] =
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TABLE.characters.elementAt((x_ / pow(58, i).toInt() % 58).toInt());
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}
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return newR.join();
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}
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/// bv转bv
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static int bv2av(String bv) {
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int r = 0;
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for (int i = 0; i < S.length; i++) {
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r += (TABLE.indexOf(bv.characters.elementAt(S[i])).toInt()) *
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pow(58, i).toInt();
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}
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return (r - ADD) ^ XOR;
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}
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// 匹配
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static Map<String, dynamic> matchAvorBv({String? input}) {
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final Map<String, dynamic> result = {};
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if (input == null || input.isEmpty) {
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return result;
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}
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final RegExp bvRegex = RegExp(r'BV[0-9A-Za-z]{10}', caseSensitive: false);
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final RegExp avRegex = RegExp(r'AV\d+', caseSensitive: false);
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final Iterable<Match> bvMatches = bvRegex.allMatches(input);
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final Iterable<Match> avMatches = avRegex.allMatches(input);
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final List<String> bvs =
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bvMatches.map((Match match) => match.group(0)!).toList();
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final List<String> avs =
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avMatches.map((Match match) => match.group(0)!).toList();
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if (bvs.isNotEmpty) {
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result['BV'] = bvs[0].substring(0, 2).toUpperCase() + bvs[0].substring(2);
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}
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if (avs.isNotEmpty) {
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result['AV'] = int.parse(avs[0].substring(2));
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}
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return result;
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}
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// eid生成
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static String? genAuroraEid(int uid) {
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if (uid == 0) {
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return null;
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}
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String uidString = uid.toString();
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List<int> resultBytes = List.generate(
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uidString.length,
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(i) => uidString.codeUnitAt(i) ^ "ad1va46a7lza".codeUnitAt(i % 12),
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);
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String auroraEid = base64Url.encode(resultBytes);
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auroraEid = auroraEid.replaceAll(RegExp(r'=*$', multiLine: true), '');
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return auroraEid;
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}
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}
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