How to use the @pylonide/jsdav/lib/shared/exceptions.Forbidden function in @pylonide/jsdav

copy: function(source, destination, callback) {
    var self = this;
    source = this.getRealPath(source);
    destination = this.getRealPath(destination);
    if (!this.insideSandbox(destination)) {
      return callback(new Exc.Forbidden("You are not allowed to copy to " +
                      this.stripSandbox(destination)));
    }

    // first check if source exists
    this.vfs.stat(source, {}, function(err, stat) {
      if (err || stat.err)
        return callback(err);

      // if destination exists try to delete it
      self.vfs.rmdir(destination, { recursive: true }, function(err) {
        // ignore error because destination may not exists
        self.vfs.execFile("cp", {args: ["-R", source, destination]}, callback);
      });
    });
  },

this.vfs.mkfile(path, {}, function(err, meta) {
        if (err) {
          if (err.code == "EACCES")
            err = new Exc.Forbidden("Permission denied to write file:" + path);
          return callback(err);
        }

        handler.getRequestBody(type, meta.stream, false, callback);
      });
    }