private static TokenOptions ValidateOptions(IOptions <TokenOptions> iOptions)
{
if (iOptions is null)
{
throw new ArgumentNullException(nameof(iOptions));
}
var options = iOptions.Value;
if (options is null)
{
throw new ArgumentNullException(nameof(iOptions.Value));
}
if (options.Length <= 0)
{
throw new ArgumentException(
"Length of token must be a positive integer",
nameof(iOptions.Value.Length));
}
if (options.Length < CharSetManager.GetSetsCount(options.CharSets))
{
throw new ArgumentException(
"Length of token must be greater or equal to count of character sets",
nameof(iOptions.Value.Length));
}
if (options.CharSets == CharSetOptions.None)
{
throw new ArgumentException(
"No character set selected",
nameof(iOptions.Value.CharSets));
}
if (options.DistinctChars.Count != null &&
(options.DistinctChars.Count < 0 || options.DistinctChars.Count > options.Length))
{
throw new ArgumentException(
$"Count of distinct characters must be defined on range [0 - {options.DistinctChars.Count}]",
nameof(iOptions.Value.DistinctChars.Count));
}
return(options);
}
/// <summary>
/// Generates a new random token using specified options
/// </summary>
public static IRandomToken Generate(IOptions <TokenOptions> iOptions)
{
var options = ValidateOptions(iOptions);
string tokenPayload;
var token = new StringBuilder();
var rules = ResolveRules(options);
var charSets = CharSetManager.BuildCharSets(options.CharSets);
bool reRun;
do
{
token.Clear();
tokenPayload = null;
reRun = false;
AppendConsecutivePart(token, charSets);
AppendNonConsecutivePart(token, charSets, options.Length - charSets.Count);
tokenPayload = Randomizer.Shuffle(token.ToString());
if (rules.Count > 0)
{
var failedRules = new List <ITokenRule>(rules.Where(rule => !rule.TryApply(tokenPayload)));
if (failedRules.Count > 0)
{
reRun = !failedRules.TrueForAll(rule => rule.CanReApplyOnShuffledToken);
if (!reRun)
{
tokenPayload = Randomizer.Shuffle(tokenPayload);
while (!failedRules.TrueForAll(rule => rule.TryApply(tokenPayload)))
{
tokenPayload = Randomizer.Shuffle(tokenPayload);
}
}
}
}
} while (reRun);
return(new RandomToken(tokenPayload, options));
}