Rewrite rules with "base url" prefix

Projects NGINX
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1

Hi all.
I have a lot of rewrite rules (coming from Prestashop) that works as expected if the shop is located in the root path (ie: “/”).

These rules are stored in a snippet file so that I can include them in all domains by simply including a single config file.

Now, I have an issue: some prestashop installs are under a sub-folder (ie: ‘/shop’) and thus the rewrite regex doesn’t match anything, in example: rewrite ^/(\d)(-[\w-]+)?/.+\.jpg$ /img/p/$1/$1$2.jpg last;

I’ve thought to set a variable, called $shop_base_url and set to ‘/’ as default, overridden in each website config if the shop is in una subdirectory, but I can’t use the variable in the regex.

Any idea ?

1 Like
2

You should be able to use variables in the rewrite definition, you just have to make sure it is being set before the rewrite is hit. Do you have an example of the configurations that you have tried and did not work as expected?

3

Do you have an example of the configurations that you have tried and did not work as expected?

This is something i’m trying:

This is in the virtualhost

   set $prestashop_base_url "/shop/";
   include snippets/prestashop.conf;

This is the snippet prestashop.conf that i’m including in each virtualhost with presatshop:

   if ( $prestashop_base_url = "" ) { 
      set $prestashop_base_url "/"; 
   }

   location $prestashop_base_url {
      rewrite ^${prestashop_base_url}(\d)(\d)(-[\w-]+)?/.+\.jpg$ ${prestashop_base_url}img/p/$1/$2/$1$2$3.jpg last;
      try_files $uri $uri/ ${prestashop_base_url}/index.php?$query_string;
   }

We have multiple CMSs on this website, there is Laravel install on / and a prestashop install on /shop

Both have their own rewrite rules, so on Laravel, I have to “filter-out” anything related to prestashop. (how?)

Physical path for prestashop is different than the URL: shop is physically located in /public/shop but url is /shop so probably the try_files has to be changed in some way.

Any idea ?

4

For filtering out the prestashop related assets, if there are references in the HTML that are trying to load assets that are not using the correct /shop path, you can use the sub_filter directive to rewrite those on the fly.

For the physical path part, does the config use proxy_pass to route the requests to the prestashop app? If it does, the path can be added on in that space. If it is a location on the filesystem, you can define a root directive in the location block to server data from a specific path on the system.

5

I’m not an nginx expert, i use it from less than a year.
This is my full virtualhost config (all virtualhosts are the same), could you please give me a working example?

server {
   listen 443 ssl http2;
   listen [::]:443 ssl http2;

   server_name mydomain.com;

   ssl_certificate     /var/www/$server_name/ssl/fullchain.cer;
   ssl_certificate_key /var/www/$server_name/ssl/certificate.key;

   access_log  /var/log/nginx/mydomain.com/access.log;
   error_log   /var/log/nginx/mydomain.com/error.log;

   root   /var/www/mydomain.com/web/public;
   index  index.php index.html index.htm;

   set $prestashop_base_url "/shop/";
   include snippets/prestashop.conf

   try_files $uri $uri/ /index.php?$query_string;

   location ~ \.php$ {
      fastcgi_pass   unix:/run/php/mydomain.com.sock;
      fastcgi_index  index.php;
      fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
      fastcgi_intercept_errors on;
      include        fastcgi_params;
      fastcgi_read_timeout 300;
   }

   location ~ /\.ht {
      deny  all;
   }
}

The snippet (has to be fixed with the changes requested in this thread):

    if ( $prestashop_base_url = "" ) {
        set $prestashop_base_url "/";
    }

    rewrite ^/(\d)(-[\w-]+)?/.+\.jpg$ /img/p/$1/$1$2.jpg last;
    rewrite ^/(\d)(-[\w-]+)?/.+\.webp$ /img/p/$1/$1$2.webp last;
    rewrite ^/(\d)(-[\w-]+)?/.+\.avif$ /img/p/$1/$1$2.avif last;

    rewrite ^/(\d)(\d)(-[\w-]+)?/.+\.jpg$ /img/p/$1/$2/$1$2$3.jpg last;
    rewrite ^/(\d)(\d)(-[\w-]+)?/.+\.webp$ /img/p/$1/$2/$1$2$3.webp last;
    rewrite ^/(\d)(\d)(-[\w-]+)?/.+\.avif$ /img/p/$1/$2/$1$2$3.avif last;
6

Any advice ?

7

So is the primary concern here that the rewrites are sent to /shop/img instead of /img? From looking at the prestashop docs you are missing a few location blocks to serve the files from. Does the default config work as expected, you just want to sometimes serve the static files from a different directory?

8

the rewrite config is much longer, i’ve posted just some test lines

standard config with PrestaShop in the root dir works, my issue is sharing the same config file (with some adjustments) allowing multiple PrestaShop installs in subdirs, in example:

/ laravel install
/shop PrestaShop1
/otherstore PrestaShop2

and so on.

9

Heya! Did you ever figure this out? You can’t really use variables as part of a regex in NGINX since the regex is compiled upon reloading NGINX (to optimize performance) whilst variables are only set when the respective variable setting directive is processed (e.g. set, map, or geo). You probably want to rethink the approach taken here, even though I don’t have any straight suggestions given my lack of familiarity with Prestashop.

I would also suggest asking in the Prestashop community too to see if anyone else is running a similar environment. There might be some Prestashop specifics that you need to take into account that we would not be familiar with here.

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