{ config, ... }:

let
  objStorHost = "mastodon.web.pub.solar";
in
{
  services.nginx.virtualHosts = {
    "files.${config.pub-solar-os.networking.domain}" = {
      enableACME = true;
      forceSSL = true;

      # Use variable to force nginx to perform a DNS resolution on its value,
      # the IP of the object storage provider may not always remain the same.
      extraConfig = ''
        set $s3_backend 'https://${objStorHost}';
      '';

      locations = {
        "= /" = {
          index = "index.html";
        };

        "/" = {
          tryFiles = "$uri @s3";
        };

        "@s3" = {
          extraConfig = ''
            limit_except GET {
              deny all;
            }

            proxy_set_header Host ${objStorHost};
            proxy_set_header Connection \'\';
            proxy_set_header Authorization \'\';
            proxy_hide_header Set-Cookie;
            proxy_hide_header 'Access-Control-Allow-Origin';
            proxy_hide_header 'Access-Control-Allow-Methods';
            proxy_hide_header 'Access-Control-Allow-Headers';
            proxy_hide_header x-amz-id-2;
            proxy_hide_header x-amz-request-id;
            proxy_hide_header x-amz-meta-server-side-encryption;
            proxy_hide_header x-amz-server-side-encryption;
            proxy_hide_header x-amz-bucket-region;
            proxy_hide_header x-amzn-requestid;
            proxy_ignore_headers Set-Cookie;
            proxy_pass $s3_backend$uri;
            proxy_intercept_errors off;
            proxy_ssl_protocols TLSv1.2 TLSv1.3;
            proxy_ssl_server_name on;

            proxy_cache cache;
            proxy_cache_valid 200 48h;
            proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
            proxy_cache_lock on;

            expires 1y;
            add_header Cache-Control public;
            add_header 'Access-Control-Allow-Origin' '*';
            add_header X-Cache-Status $upstream_cache_status;
            add_header X-Content-Type-Options nosniff;
            add_header Content-Security-Policy "default-src 'none'; form-action 'none'";
          '';
        };
      };
    };
  };
}