/// <summary>
/// Generates a Random Password
/// respecting the given strength requirements.
/// </summary>
/// <param name="opts">A valid PasswordOptions object
/// containing the password strength requirements.</param>
/// <returns>A random password</returns>
public static string GenerateRandomPassword(FWPasswordOptions opts = null)
{
if (opts == null)
{
opts = new FWPasswordOptions();
}
string[] randomChars = new[] {
"ABCDEFGHJKLMNPQRSTUVWXYZ", // uppercase
"abcdefghijkmnpqrstuvwxyz", // lowercase
"123456789", // digits
"@$?_-" // non-alphanumeric
};
Random rand = new Random(Environment.TickCount);
List <char> chars = new List <char>();
if (opts.RequireUppercase)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[0][rand.Next(0, randomChars[0].Length)]);
}
if (opts.RequireLowercase)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[1][rand.Next(0, randomChars[1].Length)]);
}
if (opts.RequireDigit)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[2][rand.Next(0, randomChars[2].Length)]);
}
if (opts.RequireNonAlphanumeric)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[3][rand.Next(0, randomChars[3].Length)]);
}
for (int i = chars.Count; i < opts.RequiredLength ||
chars.Distinct().Count() < opts.RequiredUniqueChars; i++)
{
string rcs = randomChars[rand.Next(0, randomChars.Length)];
chars.Insert(rand.Next(0, chars.Count),
rcs[rand.Next(0, rcs.Length)]);
}
return(new string(chars.ToArray()));
}
/// <summary>
/// Checks if a password meets the minimum requirements to be valid.
/// </summary>
/// <param name="password">The password to validate.</param>
/// <param name="opts">The password requirements options.</param>
/// <returns></returns>
public static (bool Valid, List <string> Errors) ValidatePasswordStrength(string password, FWPasswordOptions opts = null)
{
if (opts == null)
{
opts = new FWPasswordOptions();
}
var errors = new List <string>();
// Checks the password length
if (password.Length < opts.RequiredLength)
{
errors.Add(string.Format(Resources.Resources.FWInvalidPassword_RequiredLength, opts.RequiredLength));
}
// Checks the number of unique characters
if (password.Distinct().Count() < opts.RequiredUniqueChars)
{
errors.Add(string.Format(Resources.Resources.FWInvalidPassword_RequiredUniqueChars, opts.RequiredUniqueChars));
}
// Checks for digits
if (opts.RequireDigit && !Regex.IsMatch(password, @"\d"))
{
errors.Add(Resources.Resources.FWInvalidPassword_RequireDigit);
}
// Checks for lowercase
if (opts.RequireLowercase && !Regex.IsMatch(password, @"[a-z]"))
{
errors.Add(Resources.Resources.FWInvalidPassword_RequireLowercase);
}
// Checks for uppercase
if (opts.RequireUppercase && !Regex.IsMatch(password, @"[A-Z]"))
{
errors.Add(Resources.Resources.FWInvalidPassword_RequireUppercase);
}
// Checks for nonalphanumeric
if (opts.RequireNonAlphanumeric && !Regex.IsMatch(password, @"\W|_", RegexOptions.ECMAScript))
{
errors.Add(Resources.Resources.FWInvalidPassword_RequireNonAlphanumeric);
}
return(errors.Count == 0, errors);
}