https://lawis.at/user/scripts/chpwd/edit/models.js?v=2.3.5-HF1

1function UserMetadataValidator() {
2	this.isValidUsername = function(value) {
3		if(value.match(/^[\w-_\.@]+$/)) {
4			return true;
5		}
6		return false;
7	};
8
9	this.isValidPassword = function(value) {
10		if(value) {
11			return true;
12		}
13		return KGISvalueFetching.metaData.has('id');
14	};
15
16    this.isValidSet = function(inputSet){
17        var failed = new Array();
18        if(!this.isValidUsername(inputSet.username)) {
19            failed.push('username');
20        }
21        if($('#old_password').length > 0) {
22        	if(!this.isValidPassword(inputSet.old_password) || !inputSet.old_password) {
23        		failed.push('old_password');
24        	}
25        }
26        if(!this.isValidPassword(inputSet.password)) {
27        	failed.push('password');
28        }
29        if(!this.isValidOptionalEmail(inputSet.email)) {
30        	failed.push('email');
31        }
32        return failed;
33    };
34}
35UserMetadataValidator.prototype = new KGISValidator( );
36
37var User = Backbone.Model.extend({
38    urlRoot: KGISConfig.apiRoot + '/admin/chpwd/',
39    
40    initialize: function(){
41    	this.on("change", function(model){
42    		KGISapp.triggerEvent("modelChanged:userMeta",this); 
43    	});         
44    },
45    validator: (function(){
46    	return new UserMetadataValidator();
47    }())
48});