com.nulabinc.zxcvbn.guesses.EstimateGuess Maven / Gradle / Ivy

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This is a java port of zxcvbn, which is a JavaScript password strength generator.

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package com.nulabinc.zxcvbn.guesses;

import com.nulabinc.zxcvbn.Context;
import com.nulabinc.zxcvbn.Pattern;
import com.nulabinc.zxcvbn.Scoring;
import com.nulabinc.zxcvbn.matchers.Match;
import java.util.EnumMap;
import java.util.Map;

public class EstimateGuess extends BaseGuess {

  private final CharSequence password;
  private final Map patternGuessMap = new EnumMap<>(Pattern.class);

  public EstimateGuess(Context context, CharSequence password) {
    super(context);
    this.password = password;
    patternGuessMap.put(Pattern.Bruteforce, new BruteforceGuess(context));
    patternGuessMap.put(Pattern.Dictionary, new DictionaryGuess(context));
    patternGuessMap.put(Pattern.Spatial, new SpatialGuess(context));
    patternGuessMap.put(Pattern.Repeat, new RepeatGuess(context));
    patternGuessMap.put(Pattern.Sequence, new SequenceGuess(context));
    patternGuessMap.put(Pattern.Regex, new RegexGuess(context));
    patternGuessMap.put(Pattern.Date, new DateGuess(context));
  }

  @Override
  public double exec(Match match) {
    if (match.guesses != null) {
      return match.guesses;
    }

    int minGuesses = 1;
    if (match.tokenLength() < password.length()) {
      minGuesses =
          match.tokenLength() == 1
              ? MIN_SUBMATCH_GUESSES_SINGLE_CHAR
              : MIN_SUBMATCH_GUESSES_MULTI_CHAR;
    }

    Guess guess = patternGuessMap.get(match.pattern);
    double guesses = guess != null ? guess.exec(match) : 0;

    match.guesses = Math.max(guesses, minGuesses);
    match.guessesLog10 = Scoring.log10(match.guesses);
    return match.guesses;
  }
}