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/*
    Password Validator 0.1
    (c) 2007 Steven Levithan <stevenlevithan.com>
    MIT License
*/

function validatePassword (pw, options) {
    // default options (allows any password)
    var o = {
        lower:    0,
        upper:    0,
        alpha:    0, /* lower + upper */
        numeric:  0,
        special:  0,
        length:   [0, Infinity],
        custom:   [ /* regexes and/or functions */ ],
        badWords: [],
        badSequenceLength: 0,
        noQwertySequences: false,
        noSequential:      false
    };

    for (var property in options)
        o[property] = options[property];

    var re = {
            lower:   /[a-z]/g,
            upper:   /[A-Z]/g,
            alpha:   /[A-Z]/gi,
            numeric: /[0-9]/g,
            special: /[\W_]/g
        },
        rule, i;

    // enforce min/max length
    if (pw.length < o.length[0] || pw.length > o.length[1])
        return false;

    // enforce lower/upper/alpha/numeric/special rules
    for (rule in re) {
        if ((pw.match(re[rule]) || []).length < o[rule])
            return false;
    }

    // enforce word ban (case insensitive)
    for (i = 0; i < o.badWords.length; i++) {
        if (pw.toLowerCase().indexOf(o.badWords[i].toLowerCase()) > -1)
            return false;
    }

    // enforce the no sequential, identical characters rule
    if (o.noSequential && /([\S\s])\1/.test(pw))
        return false;

    // enforce alphanumeric/qwerty sequence ban rules
    if (o.badSequenceLength) {
        var lower   = "abcdefghijklmnopqrstuvwxyz",
            upper   = lower.toUpperCase(),
            numbers = "0123456789",
            qwerty  = "qwertyuiopasdfghjklzxcvbnm",
            start   = o.badSequenceLength - 1,
            seq     = "_" + pw.slice(0, start);
        for (i = start; i < pw.length; i++) {
            seq = seq.slice(1) + pw.charAt(i);
            if (
                lower.indexOf(seq)   > -1 ||
                upper.indexOf(seq)   > -1 ||
                numbers.indexOf(seq) > -1 ||
                (o.noQwertySequences && qwerty.indexOf(seq) > -1)
            ) {
                return false;
            }
        }
    }

    // enforce custom regex/function rules
    for (i = 0; i < o.custom.length; i++) {
        rule = o.custom[i];
        if (rule instanceof RegExp) {
            if (!rule.test(pw))
                return false;
        } else if (rule instanceof Function) {
            if (!rule(pw))
                return false;
        }
    }

    // great success!
    return true;
}

var password = "P@śsw0rd";
var passed = validatePassword(password, {
    length:   [8, Infinity],
    lower:    1,
    upper:    1,
    numeric:  1,
    special:  1,
    badWords: ["password", "steven", "levithan"],
    badSequenceLength: 4
});

passed;