RedirectService.php

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<?php
namespace Elgg;

use ElggSession;

class RedirectService {

    protected $session;

    protected $is_xhr;

    protected $site_url;

    protected $current_url;

    public function __construct(ElggSession $session, $is_xhr, $site_url, $current_url) {
        $this->session = $session;
        $this->is_xhr = $is_xhr;
        $this->site_url = $site_url;
        $this->current_url = $current_url;
    }

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

        if (0 !== strpos($this->current_url, $this->site_url)) {
            return;
        }
        $path = substr($this->current_url, 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);
    }
}