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Description:

random string generator

random_string_generator #

An easy to use, customizable and secure random string generator.
Can also be used as a password generator by using the following option:
mustHaveAtLeastOneOfEach = true
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NEW (2.0.0) > PasswordStrengthChecker, an util to check how strong a password generated with RandomStringGenerator is. The checkStrength static function will return one of the 4 enum values available: VERY_WEAK, WEAK, GOOD and STRONG, based on the RegEx patterns provided to it.
Usage #
Basic usage #
var generator = RandomStringGenerator(
fixedLength: 10,
);

print(generator.generate());
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This will generate a random string of length 10 which contains:

random uppercase and lowercase alpha characters
random digits
random symbols

You can change the properties on the generator object #
var generator = RandomStringGenerator(
fixedLength: 10,
);
generator.fixedLength = 5;

print(generator.generate());
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WARNING: The call to .generate() will throw RandomStringGeneratorException with a String message property when the parameters are logically wrong! You should try-catch and print the message to see what was wrong. #
Examples when it will throw: #

If you set minLength > maxLength.
If you set only minLength or maxLength, but you do not set the other one.
If you set both fixedLength and minLength + maxLength.
If you set hasDigits = true, hasSymbols = true and mustHaveAtLeastOneOfEach = true, but you set the length to be 1 instead of minimum 2.

Advanced usage #
var generator = RandomStringGenerator(
hasAlpha: true,
alphaCase: AlphaCase.UPPERCASE_ONLY,
hasDigits: false,
hasSymbols: true,
minLength: 10,
maxLength: 25,
mustHaveAtLeastOneOfEach: true,
);

print(generator.generate());
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This will generate a random string of length between 10 (included) and 25 (included) which is guaranteed to contain at least one of below:

random uppercase-only alpha characters
random digits
random symbols

Note: In order for the at least one of each feature to work, you must provide a minimum length at least equal to the sum of the true boolean values (hasAlpha, hasDigits, hasSymbols) and the alphaCase. #
Examples, assuming mustHaveAtLeastOneOfEach = true: #

If hasAlpha, hasDigits, hasSymbols are all set to true and alphaCase is set to AlphaCase.LOWERCASE_ONLY, the total length must be 3 in order to cover all cases.

If hasAlpha, hasDigits, hasSymbols are all set to true and alphaCase is set to AlphaCase.MIXED_CASE, the total length must be (3 + 1 from MIXED_CASE, which means both lower and upper) = 4 in order to cover all cases.

You can also provide custom lists of characters #
var generator = RandomStringGenerator(
hasAlpha: true,
alphaCase: AlphaCase.MIXED_CASE,
hasDigits: true,
hasSymbols: false,
minLength: 5,
maxLength: 10,
mustHaveAtLeastOneOfEach: false,
customUpperAlphabet = ['A', 'B', 'X', 'Z'],
customLowerAlphabet = ['w', 'n', 'h'],
customDigits = ['1', '2', '3'], // digits as String
customSymbols = ['?', '@'],
);

print(generator.generate());
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For more information, please see the documentation.

License #
MIT