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GPS Security

GPS Security

GPS Security


I am trying to add some security to a web app I am writing which will mean if you try and run it more than 100m from a certain location it will redirect to a page gpsfail.asp otherwise it will go to loginform.asp

If you are not logged in it redirects to a page that has this code:


<body onload="distanceToOffice();"> 


In my .js file I have the following:

function distanceToOffice()

function handle_geolocation_query(position)
            //alert('Lat: ' + position.coords.latitude + ' ' +  
            //      'Lon: ' + position.coords.longitude);  
	if (xmlhttpDistanceToOffice==null)
	  alert ("Your browser does not support XMLHTTP!");
	xmlhttpDistanceToOffice.onreadystatechange=function(){if (xmlhttpDistanceToOffice.readyState==4){var aspResponse = xmlhttpDistanceToOffice.responseText;document.getElementById('distanceToOfficeDiv').innerHTML = aspResponse;}}

In my distancetooffice.asp I have loads of code that has various functions for calculating distances between points etc. but the main thing is I can make the response text be a number.

I want to have as much of my logic hidden from the user as possible - so should I make the response text be the page I want to go to and then on my client side code have something like



Thanks very much


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