100 lines
2.3 KiB
Dart
100 lines
2.3 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 letters = 'abcdefghijklmnopqrstuvwxyz';
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static const numbers = '1234567890';
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static const symbols = '_';
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static String getRandomString(
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int length, {
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hasLowercaseLetters = false,
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hasUppercaseLetters = false,
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hasNumbers = false,
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hasSymbols = false,
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isStrict = false,
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}) {
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var chars = '';
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if (hasLowercaseLetters) chars += letters;
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if (hasUppercaseLetters) chars += letters.toUpperCase();
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if (hasNumbers) chars += numbers;
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if (hasSymbols) chars += symbols;
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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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var res = '';
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var 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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var shuffledlist = res.split('')..shuffle();
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return shuffledlist.join();
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}
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static String genString(int length, String chars) {
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return String.fromCharCodes(
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Iterable.generate(
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length,
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(_) => 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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}
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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 dbStorageName = () => getRandomString(
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6,
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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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