RedirectService.php

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<?php
namespace Elgg;

class RedirectService {

    protected bool $is_xhr;

    protected string $site_url;

    protected string $current_url;

    public function __construct(
        protected \ElggSession $session,
        \Elgg\Http\Request $request,
        \Elgg\Config $config
    ) {
        $this->is_xhr = $request->isXmlHttpRequest();
        $this->site_url = $config->wwwroot;
        $this->current_url = $request->getCurrentURL();
    }

    public function setLastForwardFrom() {
        if ($this->is_xhr) {
            return;
        }

        if (elgg_strpos($this->current_url, $this->site_url) !== 0) {
            return;
        }
        
        $path = elgg_substr($this->current_url, elgg_strlen($this->site_url));

        $patterns = [
            '~^action/~',
            '~^cache/~',
            '~^serve-file/~',
        ];
        foreach ($patterns as $pattern) {
            if (preg_match($pattern, $path)) {
                return;
            }
        }

        $this->session->set('last_forward_from', $this->current_url);
    }
}