允许 logo.png,其它的 .png 均不允许
  location ~ .*\.(wma|wmv|asf|mp3|mmf|zip|rar|jpg|gif|png|swf|flv|mp4)$ {
      valid_referers none blocked *.idev.top;
  
      if ($invalid_referer) {
          return 403;
      }
  }
  location = /logo.png { # 替换/path/to/为logo.png的实际路径
      allow all; # 允许所有来源访问logo.png
  }
  
  # 对于其他所有的PNG文件(除了logo.png),维持原来的防盗链配置
  location ~ /\.(?!logo)\.png$ {
      valid_referers none blocked *.idev.top;
      if ($invalid_referer) {
          return 403;
      }
  }