Can this function be abstracted into something like:

```javascript
OAE.globalAdminRouter.on('get', '/api/download/signed', verifySignedDownload);
OAE.tenantRouter.on('get', '/api/download/signed', verifySignedDownload);
/*!
 * Download a file, verification happens via a signature in the querystring.
 * By adding a signature an expensive access check is avoided.
 * This should only be used for items that do not have a high security risk attached to them.
 */
var verifySignedDownload = function(req, res) {
    ContentAPI.verifySignedDownloadQueryString(req.ctx, req.query, function(err, downloadInfo) {
        if (err) {
            return res.send(err.code, err.msg);
        }

        return _handleDownload(res, downloadInfo);
    });
};