Nginx images

server {
        error_log    /var/log/nginx/skeletis-content.log;
        rewrite_log on;

        root /var/www/skeletis-content.cz;
        index index.html;

        server_name skeletis-content.cz skeletis-content.loc;

        location ~* /(\d+)\.(jpg|jpeg|png|gif|bmp)/([a-z0-9]+)/(\d+)x(\d+) {
                alias "/var/www/skeletis-content.cz";
                set $id $1;
                set $ext $2;
                set $hash $3;
                set $width $4;
                set $height $5;

                set $thumb_file "/$1/thumb_$4x$5.$2";
                set $resize_url "resize?id=$id&ext=$ext&width=$width&height=$height";
                set $hash_file "/$1/_$hash";

                if (!-f $document_root$hash_file) {
                        return 401;
                }

                if (!-f $thumb_file) {
                        proxy_pass http://127.0.0.1/$resize_url;
                        break;
                }

                proxy_store          $document_root$thumb_file;
                proxy_store_access   user:rw  group:rw  all:r;
                proxy_temp_path      /tmp/images;
                proxy_set_header     Host $host;
        }

        location /resize {
                alias /var/www/skeletis-content.cz/$arg_id/_.$arg_ext;
                image_filter resize $arg_width $arg_height;
                image_filter_jpeg_quality 90;
                allow 127.0.0.0/8;
                deny all;
        }
}