gistfile1.js

function init() {

    var pswp = new Pswp();
    pswp.listen("gettingData", refreshSignedUrl(pswp));
};
 
function refreshSignedUrl(pswp) {

    return function (index, item) {

        aws.signUrl(item, function(_url) {

            pswp.url = _url;
        });
    };
};