code: function(iframe) {
              var doc = iframe.contentDocument || iframe.contentWindow.document,
                  queryString = doc.location.search,
                  match = /bucket=(.+)&key=(.+)&etag=(.+)/.exec(queryString);
  
              if (match) {
                  return {
                      bucket: match[1],
                      key: match[2],
                      etag: match[3].replace(/%22/g, "")
                  };
              }
          }
docs: Looks at a response from S3 contained in an iframe and parses the query string in an attempt to identify
  the associated resource.
  
  @param iframe Iframe containing response
  @returns {{bucket: *, key: *, etag: *}}