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<?php

class Red_Nginx_File extends Red_FileIO
{
    public function force_download()
    {
        parent::force_download();
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="' . $this->export_filename('nginx') . '"');
    }
    public function get_data(array $items, array $groups)
    {
        $lines = array();
        $version = red_get_plugin_data(dirname(dirname(__FILE__)) . '/redirection.php');
        $lines[] = '# Created by Redirection';
        $lines[] = '# ' . date('r');
        $lines[] = '# Redirection ' . trim($version['Version']) . ' - https://redirection.me';
        $lines[] = '';
        $lines[] = 'server {';
        $parts = array();
        foreach ($items as $item) {
            if ($item->is_enabled()) {
                $parts[] = $this->get_nginx_item($item);
            }
        }
        $lines = array_merge($lines, array_filter($parts));
        $lines[] = '}';
        $lines[] = '';
        $lines[] = '# End of Redirection';
        return implode(PHP_EOL, $lines) . PHP_EOL;
    }
    private function get_redirect_code(Red_Item $item)
    {
        if ($item->get_action_code() === 301) {
            return 'permanent';
        }
        return 'redirect';
    }
    public function load($group, $data, $filename = '')
    {
        return 0;
    }
    private function get_nginx_item(Red_Item $item)
    {
        $target = 'add_' . $item->get_match_type();
        if (method_exists($this, $target)) {
            return '    ' . $this->{$target}($item, $item->get_match_data());
        }
        return false;
    }
    private function add_url(Red_Item $item, array $match_data)
    {
        return $this->get_redirect($item->get_url(), $item->get_action_data(), $this->get_redirect_code($item), $match_data['source'], $item->source_flags->is_regex());
    }
    private function add_agent(Red_Item $item, array $match_data)
    {
        if ($item->match->url_from) {
            $lines[] = 'if ( $http_user_agent ~* ^' . $item->match->user_agent . '$ ) {';
            $lines[] = '        ' . $this->get_redirect($item->get_url(), $item->match->url_from, $this->get_redirect_code($item), $match_data['source']);
            $lines[] = '    }';
        }
        if ($item->match->url_notfrom) {
            $lines[] = 'if ( $http_user_agent !~* ^' . $item->match->user_agent . '$ ) {';
            $lines[] = '        ' . $this->get_redirect($item->get_url(), $item->match->url_notfrom, $this->get_redirect_code($item), $match_data['source']);
            $lines[] = '    }';
        }
        return implode("\n", $lines);
    }
    private function add_referrer(Red_Item $item, array $match_data)
    {
        if ($item->match->url_from) {
            $lines[] = 'if ( $http_referer ~* ^' . $item->match->referrer . '$ ) {';
            $lines[] = '        ' . $this->get_redirect($item->get_url(), $item->match->url_from, $this->get_redirect_code($item), $match_data['source']);
            $lines[] = '    }';
        }
        if ($item->match->url_notfrom) {
            $lines[] = 'if ( $http_referer !~* ^' . $item->match->referrer . '$ ) {';
            $lines[] = '        ' . $this->get_redirect($item->get_url(), $item->match->url_notfrom, $this->get_redirect_code($item), $match_data['source']);
            $lines[] = '    }';
        }
        return implode("\n", $lines);
    }
    private function get_redirect($line, $target, $code, $source, $regex = false)
    {
        $line = ltrim($line, '^');
        $line = rtrim($line, '$');
        $source_url = new Red_Url_Encode($line, $regex);
        $target_url = new Red_Url_Encode($target);
        $from = $source_url->get_as_source();
        $from = ltrim($from, '^');
        $from = rtrim($from, '$');
        if (isset($source['flag_case']) && $source['flag_case']) {
            $from = '(?i)^' . $from;
        } else {
            $from = '^' . $from;
        }
        return 'rewrite ' . $from . '$ ' . $target_url->get_as_target() . ' ' . $code . ';';
    }
}