118 lines
2.7 KiB
Dart
118 lines
2.7 KiB
Dart
import 'dart:math';
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Random _rnd = Random();
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typedef StringGeneratorFunction = String Function();
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class StringGenerators {
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static const String letters = 'abcdefghijklmnopqrstuvwxyz';
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static const String numbers = '1234567890';
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static const String symbols = '_';
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static String getRandomString(
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final int length, {
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final hasLowercaseLetters = false,
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final hasUppercaseLetters = false,
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final hasNumbers = false,
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final hasSymbols = false,
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final isStrict = false,
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}) {
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String chars = '';
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if (hasLowercaseLetters) {
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chars += letters;
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}
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if (hasUppercaseLetters) {
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chars += letters.toUpperCase();
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}
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if (hasNumbers) {
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chars += numbers;
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}
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if (hasSymbols) {
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chars += symbols;
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}
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assert(chars.isNotEmpty, 'chart empty');
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if (!isStrict) {
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return genString(length, chars);
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}
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String res = '';
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int loose = length;
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if (hasLowercaseLetters) {
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loose -= 1;
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res += genString(1, letters);
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}
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if (hasUppercaseLetters) {
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loose -= 1;
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res += genString(1, letters.toUpperCase());
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}
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if (hasNumbers) {
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loose -= 1;
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res += genString(1, numbers.toUpperCase());
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}
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if (hasSymbols) {
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loose -= 1;
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res += genString(1, symbols);
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}
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res += genString(loose, chars);
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final List<String> shuffledlist = res.split('')..shuffle();
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return shuffledlist.join();
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}
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static String genString(final int length, final String chars) =>
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String.fromCharCodes(
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Iterable.generate(
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length,
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(final _) => chars.codeUnitAt(
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_rnd.nextInt(chars.length),
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),
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),
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);
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static StringGeneratorFunction userPassword = () => getRandomString(
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8,
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hasLowercaseLetters: true,
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hasUppercaseLetters: true,
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hasNumbers: true,
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isStrict: true,
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);
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static StringGeneratorFunction passwordSalt = () => getRandomString(
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8,
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hasLowercaseLetters: true,
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);
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static StringGeneratorFunction simpleId = () => getRandomString(
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5,
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hasLowercaseLetters: true,
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);
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static StringGeneratorFunction dbPassword = () => getRandomString(
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40,
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hasLowercaseLetters: true,
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hasUppercaseLetters: true,
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hasNumbers: true,
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hasSymbols: true,
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);
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static StringGeneratorFunction storageName = () => getRandomString(
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6,
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hasLowercaseLetters: true,
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hasUppercaseLetters: false,
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hasNumbers: true,
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);
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static StringGeneratorFunction apiToken = () => getRandomString(
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64,
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hasLowercaseLetters: true,
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hasUppercaseLetters: true,
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hasNumbers: true,
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);
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}
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