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

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

There is a newer version: 1.9.0

package com.nulabinc.zxcvbn.guesses;

import com.nulabinc.zxcvbn.Context;
import com.nulabinc.zxcvbn.WipeableString;
import com.nulabinc.zxcvbn.matchers.Match;

import java.util.HashMap;
import java.util.Map;

public class RegexGuess extends BaseGuess {

    private static final Map CHAR_CLASS_BASES = new HashMap<>();
    static {
        CHAR_CLASS_BASES.put("alpha_lower", 26);
        CHAR_CLASS_BASES.put("alpha_upper", 26);
        CHAR_CLASS_BASES.put("alpha", 52);
        CHAR_CLASS_BASES.put("alphanumeric", 62);
        CHAR_CLASS_BASES.put("digits", 10);
        CHAR_CLASS_BASES.put("symbols", 33);
    }

    protected RegexGuess(final Context context) {
        super(context);
    }

    @Override
    public double exec(Match match) {
        if (CHAR_CLASS_BASES.containsKey(match.regexName)) {
            return Math.pow(CHAR_CLASS_BASES.get(match.regexName), match.tokenLength());
        } else if ("recent_year".equals(match.regexName)) {
            double yearSpace = Math.abs(parseInt(match.token) - REFERENCE_YEAR);
            yearSpace = Math.max(yearSpace, MIN_YEAR_SPACE);
            return yearSpace;
        }
        return 0;
    }

    private static int parseInt(CharSequence s) {
        int result = 0;
        try {
            result = WipeableString.parseInt(s);
        } catch (NumberFormatException e) {
            // ignore
        }
        return result;
    }
}