{ pkgs }:
{
  proxy = pkgs.writeText "proxy.conf" ''
    ## Headers
    # proxy_set_header Host $host;
    proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-Host $http_host;
    proxy_set_header X-Forwarded-URI $request_uri;
    proxy_set_header X-Forwarded-Ssl on;
    proxy_set_header X-Forwarded-For $remote_addr;
  '';
  authelia-location = pkgs.writeText "authelia-location.conf" ''
    set $upstream_authelia http://192.168.1.12:9091/api/authz/auth-request;

    ## Virtual endpoint created by nginx to forward auth requests.
    location /internal/authelia/authz {
        ## Essential Proxy Configuration
        internal;
        proxy_pass $upstream_authelia;

        ## Headers
        ## The headers starting with X-* are required.
        proxy_set_header X-Original-Method $request_method;
        proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Content-Length "";
        proxy_set_header Connection "";

        ## Basic Proxy Configuration
        proxy_pass_request_body off;
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
        proxy_redirect http:// $scheme://;
        proxy_http_version 1.1;
        proxy_cache_bypass $cookie_session;
        proxy_no_cache $cookie_session;
        proxy_buffers 4 32k;
        client_body_buffer_size 128k;

        ## Advanced Proxy Configuration
        send_timeout 5m;
        proxy_read_timeout 240;
        proxy_send_timeout 240;
        proxy_connect_timeout 240;
    }
  '';
  authelia-authrequest = pkgs.writeText "authelia-authrequest.conf" ''
    ## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
    auth_request /internal/authelia/authz;

    ## Save the upstream metadata response headers from Authelia to variables.
    auth_request_set $user $upstream_http_remote_user;
    auth_request_set $groups $upstream_http_remote_groups;
    auth_request_set $name $upstream_http_remote_name;
    auth_request_set $email $upstream_http_remote_email;

    ## Inject the metadata response headers from the variables into the request made to the backend.
    proxy_set_header Remote-User $user;
    proxy_set_header Remote-Groups $groups;
    proxy_set_header Remote-Email $email;
    proxy_set_header Remote-Name $name;

    ## Configure the redirection when the authz failure occurs. Lines starting with 'Modern Method' and 'Legacy Method'
    ## should be commented / uncommented as pairs. The modern method uses the session cookies configuration's authelia_url
    ## value to determine the redirection URL here. It's much simpler and compatible with the mutli-cookie domain easily.

    ## Modern Method: Set the $redirection_url to the Location header of the response to the Authz endpoint.
    auth_request_set $redirection_url $upstream_http_location;

    ## Modern Method: When there is a 401 response code from the authz endpoint redirect to the $redirection_url.
    error_page 401 =302 $redirection_url;

    ## Legacy Method: Set $target_url to the original requested URL.
    ## This requires http_set_misc module, replace 'set_escape_uri' with 'set' if you don't have this module.
    # set_escape_uri $target_url $scheme://$http_host$request_uri;

    ## Legacy Method: When there is a 401 response code from the authz endpoint redirect to the portal with the 'rd'
    ## URL parameter set to $target_url. This requires users update 'auth.shobu.fr/' with their external authelia URL.
    # error_page 401 =302 https://auth.shobu.fr/?rd=$target_url;
  '';
}