HttpSecureLinkModule timestamp inside uri

[nenad]

I would like to use HttpSecureLinkModule to restrict access to some
member photos. Now I would like to have the timestamp inside the path
but I'm not sure how to implement that.

The timestamp I could get with \/t(\d+)\/ from uri, must I do a rewrite
and if yes how? Or exist a "single" operation way?

Photo-URL:
www.example.aaa/260/7/4/3/4255/4543535/t1331894408/1234_x.jpg?a=1234567888

location ~ _x\.(jpg|jpeg|gif|png)$ {

  secure_link $arg_a,$???;
  secure_link_md5 mysecretword$uri$???;

  root /media/photos
  ...
}

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,224960,224960#msg-224960