password_strength_plugin.js

password_strength_plugin.js

/**
 * password_strength_plugin.js
 * Copyright (c) 2009 myPocket technologies (www.mypocket-technologies.com)
 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * View the GNU General Public License <http://www.gnu.org/licenses/>.

 * @author Darren Mason ([email protected])
 * @date 3/13/2009
 * @projectDescription Password Strength Meter is a jQuery plug-in provide you smart algorithm to detect a password strength. Based on Firas Kassem orginal plugin - http://phiras.wordpress.com/2007/04/08/password-strength-meter-a-jquery-plugin/
 * @version 1.0.1
 * 
 * @requires jquery.js (tested with 1.3.2)
 * @param shortPass:    "shortPass",    //optional
 * @param badPass:        "badPass",        //optional
 * @param goodPass:        "goodPass",        //optional
 * @param strongPass:    "strongPass",    //optional
 * @param baseStyle:    "testresult",    //optional
 * @param userid:        "",                //required override
 * @param messageloc:    1                //before == 0 or after == 1
 * 
*/

(function($){ 
    $.fn.shortPass = 'Too short';
    $.fn.badPass = 'Weak';
    $.fn.goodPass = 'Good';
    $.fn.strongPass = 'Strong';
    $.fn.samePassword = 'Username and Password identical.';
    $.fn.resultStyle = "";
    
     $.fn.passStrength = function(options) {  
      
         var defaults = {
                shortPass:         "shortPass",    //optional
                badPass:        "badPass",        //optional
                goodPass:        "goodPass",        //optional
                strongPass:        "strongPass",    //optional
                baseStyle:        "testresult",    //optional
                userid:            "",                //required override
                messageloc:        1                //before == 0 or after == 1
            }; 
             var opts = $.extend(defaults, options);  
              
             return this.each(function() { 
                  var obj = $(this);
                 
                 $(obj).unbind().keyup(function()
                 {
                    
                    var results = $.fn.teststrength($(this).val(),$(opts.userid).val(),opts);
                    
                    if(opts.messageloc === 1)
                    {
                        $(this).next("." + opts.baseStyle).remove();
                        $(this).after("<span class=\""+opts.baseStyle+"\"><span></span></span>");
                        $(this).next("." + opts.baseStyle).addClass($(this).resultStyle).find("span").text(results);
                    }
                    else
                    {
                        $(this).prev("." + opts.baseStyle).remove();
                        $(this).before("<span class=\""+opts.baseStyle+"\"><span></span></span>");
                        $(this).prev("." + opts.baseStyle).addClass($(this).resultStyle).find("span").text(results);
                    }
                  });
                  
                 //FUNCTIONS
                 $.fn.teststrength = function(password,username,option){
                          var score = 0; 
                         
                         //password < 4
                         if (password.length < 4 ) { this.resultStyle =  option.shortPass;return $(this).shortPass; }
                         
                         //password == user name
                         if (password.toLowerCase()==username.toLowerCase()){this.resultStyle = option.badPass;return $(this).samePassword;}
                         
                         //password length
                         score += password.length * 4;
                         score += ( $.fn.checkRepetition(1,password).length - password.length ) * 1;
                         score += ( $.fn.checkRepetition(2,password).length - password.length ) * 1;
                         score += ( $.fn.checkRepetition(3,password).length - password.length ) * 1;
                         score += ( $.fn.checkRepetition(4,password).length - password.length ) * 1;
             
                         //password has 3 numbers
                         if (password.match(/(.*[0-9].*[0-9].*[0-9])/)){ score += 5;} 
                         
                         //password has 2 symbols
                         if (password.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)){ score += 5 ;}
                         
                         //password has Upper and Lower chars
                         if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)){  score += 10;} 
                         
                         //password has number and chars
                         if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/)){  score += 15;} 
                         //
                         //password has number and symbol
                         if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([0-9])/)){  score += 15;} 
                         
                         //password has char and symbol
                         if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([a-zA-Z])/)){score += 15;}
                         
                         //password is just a numbers or chars
                         if (password.match(/^\w+$/) || password.match(/^\d+$/) ){ score -= 10;}
                         
                         //verifying 0 < score < 100
                         if ( score < 0 ){score = 0;} 
                         if ( score > 100 ){  score = 100;} 
                         
                         if (score < 34 ){ this.resultStyle = option.badPass; return $(this).badPass;} 
                         if (score < 68 ){ this.resultStyle = option.goodPass;return $(this).goodPass;}
                         
                        this.resultStyle= option.strongPass;
                         return $(this).strongPass;
                         
                 };
          
          });  
     };  
})(jQuery); 


$.fn.checkRepetition = function(pLen,str) {
     var res = "";
     for (var i=0; i<str.length ; i++ ) 
     {
         var repeated=true;
         
         for (var j=0;j < pLen && (j+i+pLen) < str.length;j++){
             repeated=repeated && (str.charAt(j+i)==str.charAt(j+i+pLen));
             }
         if (j<pLen){repeated=false;}
         if (repeated) {
             i+=pLen-1;
             repeated=false;
         }
         else {
             res+=str.charAt(i);
         }
     }
     return res;
    };