/**
* +--------------------------------------------------------------------+
* | This file is Copyright (c) Squiz Pty Ltd       |
* | ACN 084 670 600                                                    |
* +--------------------------------------------------------------------+
* | IMPORTANT: Your use of this Software is subject to the terms of    |
* | the Licence provided in the file licence.txt. If you cannot find   |
* | this file please contact Squiz (www.squiz.net) so we may provide   |
* | you a copy.                                                        |
* +--------------------------------------------------------------------+
*
************************************************************************
*
* Modified on: 16 October 2007
* Modified by: DCITA - Joel Starkey / Tim Riley
* Change log:
* 16 October 2007
* 	- To check the link against multiple base URL's
* 	- To add email addresses (mailto:) as an exception
* 
* Modified by: Grant Bartlett
* Change Log:
*   - Adopted for SSOA                                                    
*/


var base_url = new Array('www.ssoalertservice.net.au','ssoalertservice.net.au','dev.ssoalertservice.net.au');
var warning_text = 'You are now leaving the Stay Smart Online Alert Service website.';
var exceptions = new Array('no-exceptions'); //if there are separate websites using a sub-folder, ie www.dcita.gov.au/deaflympics


//Scan all hyperlinks <a> in current webpage.
function ScanLinks() {
	var rewrite = true; 
	var links = document.getElementsByTagName('a');
	for ( var i = 0; i < links.length; i++ ) {
		//Looping the links found in the page
		if (ShouldRewriteLink(links[i])) {
			RewriteLink(links[i]);
		}//End if
	}//End for
}//End function ScanLinks()


/* Check to see if the hyperlink should be re-written based on the following conditions:
 *		- The link does not appear in the Exceptions array
 *		- The link is not an email address
 *		- The link does not match a base URL
*/
function ShouldRewriteLink(link) {
	if (IsException(link)) {
		//If there is an exception, don't rewrite
		return true;
	}//End if
	else if (AreThereEmailAddresses(link)){
		//If the link is an email address 
		return false;
	}
	else {
		if(link.href) {
			for ( var j = 0; j < base_url.length; j++ ) {
				//Loop through the base URL's
				if(link.href.indexOf(base_url[j]) != -1) {
					//If the current link matched a base URL return false (don't rewrite)
					return false;
				}//End if
			}//End for
		}//End if
	}//End else
	return true;
}//End function ShouldRewriteLink()


//Check to see if the current hyperlink matches a URL in the exceptions array
function IsException(link) {
	if (link.href ) {
		for ( var i = 0; i < exceptions.length; i ++ ) {
			//Loop through exceptions array, return true if found
			if ( link.href.indexOf(exceptions[i]) != -1 ) {
				return true;
			}//End if
		}//End for
	}//End if
	return false;
}//End IsException()

//Check to see if the current hyperlink matches an email address (mailto:)
function AreThereEmailAddresses(link) {
if ( link.href ) {
		//Is the link an email address, return true if found
		if (/^mailto:/.test(link.href)) {
			return true;
		}//End if
	}//End if
	return false;
}//End AreThereEmailAddresses()


/* The hyperlink is rewritten so a JavaScript alert box appears if there are:
 *		- no exceptions
 *		- no match to the base URL's
*/
function RewriteLink(link) {
	var old_href = link.href;
	link.onclick = function() {
		alert(warning_text);
		location.href = old_href;
	}//End onclick
	link.onkeyup = function(e) {
		var KeyID = (window.event) ? event.keyCode : e.keyCode;
		if ( KeyID == 13 ) {
			if (confirm(warning_text) ) {
				location.href = old_href;
			}// End if
		}// End if
	}//End onkeyup
}//End function RewriteLink ()


function addEvent(obj, evType, fn){
 if (obj.addEventListener){
    obj.addEventListener(evType, fn, true);
    return true;
 } else if (obj.attachEvent){
    var r = obj.attachEvent("on"+evType, fn);
    return r;
 } else {
    return false;
 }// End if
}


addEvent(window,'load',ScanLinks);