selfprivacy.org.app/lib/utils/password_generator.dart

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