107 lines
2.8 KiB
Dart
107 lines
2.8 KiB
Dart
// ignore_for_file: constant_identifier_names, non_constant_identifier_names
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import 'dart:convert';
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class IdUtils {
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static final XOR_CODE = BigInt.parse('23442827791579');
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static final MASK_CODE = BigInt.parse('2251799813685247');
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static final MAX_AID = BigInt.one << (BigInt.from(51)).toInt();
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static final BASE = BigInt.from(58);
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static const data =
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'FcwAPNKTMug3GV5Lj7EJnHpWsx4tb8haYeviqBz6rkCy12mUSDQX9RdoZf';
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/// av转bv
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static String av2bv(int aid) {
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List<String> bytes = [
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'B',
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'V',
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'1',
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'0',
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'0',
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'0',
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'0',
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'0',
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'0',
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'0',
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'0',
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'0'
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];
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int bvIndex = bytes.length - 1;
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BigInt tmp = (MAX_AID | BigInt.from(aid)) ^ XOR_CODE;
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while (tmp > BigInt.zero) {
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bytes[bvIndex] = data[(tmp % BASE).toInt()];
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tmp = tmp ~/ BASE;
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bvIndex -= 1;
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}
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String tmpSwap = bytes[3];
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bytes[3] = bytes[9];
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bytes[9] = tmpSwap;
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tmpSwap = bytes[4];
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bytes[4] = bytes[7];
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bytes[7] = tmpSwap;
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return bytes.join();
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}
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/// bv转av
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static int bv2av(String bvid) {
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List<String> bvidArr = bvid.split('');
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final tmpValue = bvidArr[3];
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bvidArr[3] = bvidArr[9];
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bvidArr[9] = tmpValue;
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final tmpValue2 = bvidArr[4];
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bvidArr[4] = bvidArr[7];
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bvidArr[7] = tmpValue2;
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bvidArr.removeRange(0, 3);
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BigInt tmp = bvidArr.fold(BigInt.zero,
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(pre, bvidChar) => pre * BASE + BigInt.from(data.indexOf(bvidChar)));
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return ((tmp & MASK_CODE) ^ XOR_CODE).toInt();
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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 =
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RegExp(r'[bB][vV][0-9A-Za-z]{10}', caseSensitive: false);
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final RegExp avRegex = RegExp(r'[aA][vV]\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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