[Nginx] 通过lua来配置实现Nginx服务器的防盗链功能

server  
{  
  listen  80;  
  server_name download.zzvips.com;  
  index index.htm index.html;  
  root /data/www/download;  
  ssi on;  
 
  location /  
  {  
    set_by_lua $downkey '  
      return ngx.md5("encryption" .. ngx.var.remote_addr .. "suffix")  
    ';  
  }  
}

server  
{  
  listen  80;  
  server_name down.zzvips.com;  
  index index.htm index.html;  
  root /data/www/down;  
  limit_conn  one 1;  
  set $limit_rate 1000k;  
 
  location /  
  {  
    set_by_lua $foo '  
      if string.sub(ngx.var.uri, 2, 33) == ngx.md5("encryption" .. ngx.var.remote_addr .. "suffix") then  
        return 1 
      else 
        return 0 
      end  
    ';  
 
    if ($foo = 1)  
    {  
      rewrite "^/([0-9a-z]{32})(.*?)$"  $2 break;  
    }  
    if ($foo = 0)  
    {  
      rewrite ^/ http://download.zzvips.com/404.htm redirect;  
    }  
  }  
}