Check if the Viewer is logged in and has the right permissions

<?xml version="1.0" encoding="UTF-8" ?>
<Module>
<ModulePrefs title="Check Viewer permission" summary="" description="" author="" author_email="" thumbnail="" screenshot="" height="380">
	<Require feature="opensocial-0.7"/>
</ModulePrefs>
<Content type="html">
	<![CDATA[
	<div id='content'></div>
	<br>
	<script type="text/javascript">
 
	var getViewer = function(responseItem) {
		if(responseItem.hadError()) {
			var sErrorcode = responseItem.getErrorCode();
			if(sErrorcode == 'forbidden') {
				document.getElementById('content').innerHTML = "You are not logged in, please log in first.";
			} else if(sErrorcode == 'unauthorized') {
				document.getElementById('content').innerHTML = "This application can't see your information because you will have to give permission to share your information. Please click the button below.";
			}
        }
		if(opensocial.hasPermission(opensocial.Permission.VIEWER)) {
			document.getElementById('content').innerHTML = "You are logged in and your public information is available.";
		}		
	}	
	var isViewer = function() {
		opensocial.requestPermission([opensocial.Permission.VIEWER], 'This reason sentence is not used at the moment', getViewer);
	}
	</script>
	<input type="button" value="Check if Viewer information is available" onClick="isViewer();">
	]]>
</Content>
</Module>