请问nginx下的防盗链如何做?

请大神指教!谢谢!

1. location ~* \.(gif|jpg|png|swf|flv)$ {
   
2.   valid_referers none blocked discuz.dismall.com ;
   
3.   if ($invalid_referer) {
   
4.     rewrite ^/ https://discuz.dismall.com/retrun.html;
   
5.     #return 403;
   
6.   }
   
7. }

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给