url.php

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<?php
if (!empty($vars['confirm']) && !isset($vars['is_action'])) {
    $vars['is_action'] = true;
}

if (!empty($vars['confirm'])) {
    $vars['data-confirm'] = elgg_extract('confirm', $vars, elgg_echo('question:areyousure'));
    
    // if (bool) true use defaults
    if ($vars['data-confirm'] === true) {
        $vars['data-confirm'] = elgg_echo('question:areyousure');
    }
}

$url = elgg_extract('href', $vars, null);
if (!$url && isset($vars['value'])) {
    $url = trim($vars['value']);
    unset($vars['value']);
}

if (isset($vars['text'])) {
    if (elgg_extract('encode_text', $vars, false)) {
        $text = htmlspecialchars($vars['text'], ENT_QUOTES, 'UTF-8', false);
    } else {
        $text = $vars['text'];
    }
    unset($vars['text']);
} else {
    $text = htmlspecialchars($url, ENT_QUOTES, 'UTF-8', false);
}

unset($vars['encode_text']);

if ($url) {
    $url = elgg_normalize_url($url);

    if (elgg_extract('is_action', $vars, false)) {
        $url = elgg_add_action_tokens_to_url($url, false);
    }

    $is_trusted = elgg_extract('is_trusted', $vars);
    if (!$is_trusted) {
        $url = strip_tags($url);
        if (!isset($vars['rel'])) {
            if ($is_trusted === null) {
                $url_host = parse_url($url, PHP_URL_HOST);
                $site_url = elgg_get_site_url();
                $site_url_host = parse_url($site_url, PHP_URL_HOST);
                $is_trusted = $url_host == $site_url_host;
            }
            if ($is_trusted === false) {
                // this is an external URL, which we do not want to be indexed by crawlers
                $vars['rel'] = 'nofollow';
            }
        }
    }

    $vars['href'] = $url;
}

if (!isset($vars['title']) && isset($vars['data-confirm'])) {
    $vars['title'] = $vars['data-confirm'];
}

unset($vars['is_action']);
unset($vars['is_trusted']);
unset($vars['confirm']);

$attributes = elgg_format_attributes($vars);
echo "<a $attributes>$text</a>";