options = $options;
$this->security = $security;
if (isset($options['enabled']) && $options['enabled']) {
add_action('wp_enqueue_scripts', array($this, 'enqueue_scripts'));
$this->setup_content_filters();
add_action('wp_footer', array($this, 'add_footer_script'));
}
}
public function enqueue_scripts() {
wp_enqueue_script(
'wpnav-redirect-script',
WPNAV_LINKS_PLUGIN_URL . 'assets/js/redirect.js',
array('jquery'),
WPNAV_LINKS_VERSION,
true
);
wp_localize_script(
'wpnav-redirect-script',
'wpnav_params',
array(
'home_url' => home_url(),
'site_domain' => parse_url(home_url(), PHP_URL_HOST),
'exclude_class' => $this->options['exclude_css_class'],
'open_new_tab' => $this->options['open_in_new_tab'],
'redirect_method' => isset($this->options['url_format']) ? $this->options['url_format'] : 'query',
'url_encoding' => 'base64',
'permalink_structure' => get_option('permalink_structure') ? true : false,
'whitelist_domains' => $this->get_whitelist_domains(),
'strings' => array(
'external_link' => __('External link', 'wpnav-links'),
'opens_new_window' => __('(opens in a new window)', 'wpnav-links')
)
)
);
}
private function get_whitelist_domains() {
$whitelist = array();
if (!empty($this->options['whitelist_domains'])) {
$whitelist = explode("\n", $this->options['whitelist_domains']);
$whitelist = array_map('trim', $whitelist);
$whitelist = array_filter($whitelist);
}
return $whitelist;
}
private function setup_content_filters() {
if (isset($this->options['intercept_content']) && $this->options['intercept_content']) {
add_filter('the_content', array($this, 'process_content'));
}
if (isset($this->options['intercept_comments']) && $this->options['intercept_comments']) {
add_filter('comment_text', array($this, 'process_content'));
}
if (isset($this->options['intercept_widgets']) && $this->options['intercept_widgets']) {
add_filter('widget_text', array($this, 'process_content'));
add_filter('widget_custom_html_content', array($this, 'process_content'));
}
}
public function process_content($content) {
if (empty($content)) {
return $content;
}
$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML('' . $content . '
', LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
libxml_clear_errors();
$links = $dom->getElementsByTagName('a');
$modified = false;
$links_to_process = array();
foreach ($links as $link) {
$links_to_process[] = $link;
}
foreach ($links_to_process as $link) {
$href = $link->getAttribute('href');
if (empty($href)) {
continue;
}
if (!empty($this->options['exclude_css_class'])) {
$class = $link->getAttribute('class');
if (strpos($class, $this->options['exclude_css_class']) !== false) {
continue;
}
}
if ($this->is_external_link($href)) {
if ($this->security->check_whitelist_domain($href)) {
continue;
}
$rel = $link->getAttribute('rel');
$rel_values = empty($rel) ? array() : explode(' ', $rel);
$rel_values = array_merge($rel_values, array('nofollow', 'noopener', 'noreferrer'));
$rel_values = array_unique($rel_values);
$link->setAttribute('rel', implode(' ', $rel_values));
if ($this->options['open_in_new_tab']) {
$link->setAttribute('target', '_blank');
// Add screen reader text for accessibility
$title = $link->getAttribute('title');
if (empty($title)) {
$link->setAttribute('title', __('External link (opens in a new window)', 'wpnav-links'));
}
}
$redirect_url = $this->security->get_redirect_url($href);
$link->setAttribute('href', $redirect_url);
$link->setAttribute('data-wpnav-external', '1');
$modified = true;
}
}
if (!$modified) {
return $content;
}
$new_html = $dom->saveHTML($dom->documentElement);
$new_html = preg_replace('/<\?xml encoding="UTF-8"\?>/', '', $new_html);
$new_html = preg_replace('/<\/?div>/', '', $new_html);
return $new_html;
}
private function is_external_link($url) {
if (strpos($url, '://') === false && strpos($url, '//') !== 0) {
return false;
}
$parsed_url = parse_url($url);
if (empty($parsed_url) || !isset($parsed_url['host'])) {
return false;
}
$site_domain = parse_url(home_url(), PHP_URL_HOST);
$is_external = ($parsed_url['host'] !== $site_domain);
if ($is_external) {
if (!empty($this->options['auto_whitelist'])) {
if (!empty($this->options['auto_whitelist']['same_root'])) {
$site_root = $this->get_root_domain($site_domain);
$url_root = $this->get_root_domain($parsed_url['host']);
if ($site_root === $url_root) {
$is_external = false;
}
}
if ($is_external && !empty($this->options['auto_whitelist']['search_engines'])) {
$search_engines = array('google.', 'bing.', 'yahoo.', 'baidu.', 'yandex.', 'duckduckgo.');
foreach ($search_engines as $engine) {
if (strpos($parsed_url['host'], $engine) !== false) {
$is_external = false;
break;
}
}
}
}
}
return $is_external;
}
private function get_root_domain($domain) {
$domain_parts = explode('.', $domain);
if (count($domain_parts) > 2) {
$tld_part = array_slice($domain_parts, -2, 2);
if (in_array($tld_part[0], array('co', 'com', 'net', 'org', 'gov', 'edu'))) {
return implode('.', array_slice($domain_parts, -3, 3));
}
return implode('.', array_slice($domain_parts, -2, 2));
}
return $domain;
}
public function add_footer_script() {
?>