Current User Permission Check on SPWeb

CurrentUserPermissionCheck.js

$(document).ready(function(){
	$.when(checkPermissions()).then(function(isOnlyContributor){
		if (isOnlyContributor){
			setInterval(HideSiteContents, 1000);
		}
	});
});

function HideSiteContents(){
	console.log($("SPAN:contains('Site contents')").length + " called");
	var siteConObj = $("SPAN:contains('Site contents')");
	siteConObj.closest("DIV[role='menuitem']").remove();
	siteConObj.remove();
}

function checkPermissions() {
	var def1 = $.Deferred();
    var call = jQuery.ajax({
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/Web/effectiveBasePermissions",
        type: "GET",
        dataType: "json",
        headers: {
            Accept: "application/json;odata=verbose"
        }
    });

    call.done(function (data, textStatus, jqXHR) {
    	SP.SOD.executeOrDelayUntilScriptLoaded(function(){;
	        var manageListsPerms = new SP.BasePermissions();
	        manageListsPerms.initPropertiesFromJson(data.d.EffectiveBasePermissions);
	
	        var isOnlyContributor = manageListsPerms.has(SP.PermissionKind.editListItems);
	        var isManager = manageListsPerms.has(SP.PermissionKind.manageLists);
	        if (isManager == true){
	        	isOnlyContributor = false;
	        }
   	        console.log("isOnlyContributor: " + isOnlyContributor + " & Manage Lists:"+isManager);
	        def1.resolve(isOnlyContributor)
        }, "SP.js")
    });
    
    return def1.promise();
}