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323 lines
7.8 KiB
PHP
323 lines
7.8 KiB
PHP
<?php
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/**
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* The class handles adding of attributes to links to content.
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*
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* @since 1.0.43.2
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* @package RankMath
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* @subpackage RankMath\Frontend
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* @author Rank Math <support@rankmath.com>
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*/
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namespace RankMath\Frontend;
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use RankMath\Helper;
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use RankMath\Traits\Hooker;
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use RankMath\Helpers\Str;
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use RankMath\Helpers\Url;
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use RankMath\Helpers\HTML;
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defined( 'ABSPATH' ) || exit;
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/**
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* Add Link_Attributes class.
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*/
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class Link_Attributes {
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use Hooker;
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/**
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* Add rel=noopener or not.
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*
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* @var bool
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*/
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public $add_noopener;
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/**
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* Add rel=nofollow to links or not.
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*
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* @var bool
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*/
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public $nofollow_link;
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/**
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* Add rel=nofollow to images or not.
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*
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* @var bool
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*/
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public $nofollow_image;
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/**
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* Open links in a new window or not.
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*
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* @var bool
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*/
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public $new_window_link;
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/**
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* Remove existing CSS class from links or not.
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*
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* @var bool
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*/
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public $remove_class;
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/**
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* Check if the link attributes have been modified or not.
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*
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* @var bool
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*/
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public $is_dirty;
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/**
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* Additional attributes to add to links.
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*
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* @var array
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*/
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public $add_attributes;
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/**
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* The Constructor.
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*/
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public function __construct() {
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$this->action( 'wp', 'add_attributes', 9999 );
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$this->action( 'rest_api_init', 'add_attributes' );
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}
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/**
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* Add nofollow, target, title and alt attributes to link and images.
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*/
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public function add_attributes() {
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// Add rel="nofollow" & target="_blank" for external links.
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$this->add_noopener = $this->do_filter( 'noopener', true );
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$this->nofollow_link = Helper::get_settings( 'general.nofollow_external_links' );
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$this->nofollow_image = Helper::get_settings( 'general.nofollow_image_links' );
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$this->new_window_link = Helper::get_settings( 'general.new_window_external_links' );
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$this->remove_class = $this->do_filter( 'link/remove_class', false );
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$this->is_dirty = false;
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// Filter to run the link attributes function even when Link options are disabled.
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$this->add_attributes = $this->do_filter( 'link/add_attributes', $this->nofollow_link || $this->new_window_link || $this->nofollow_image || $this->add_noopener );
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if ( $this->add_attributes || $this->remove_class ) {
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$this->filter( 'the_content', 'add_link_attributes', 11 );
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}
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}
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/**
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* Add nofollow and target attributes to link.
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*
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* @param string $content Post content.
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* @return string
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*/
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public function add_link_attributes( $content ) {
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preg_match_all( '/<(a\s[^>]+)>/', $content, $matches );
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if ( empty( $matches ) || empty( $matches[0] ) ) {
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return $content;
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}
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foreach ( $matches[0] as $link ) {
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$attrs = HTML::extract_attributes( $link );
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if ( ! $this->can_add_attributes( $attrs ) ) {
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continue;
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}
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$attrs = $this->remove_link_class( $attrs );
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$attrs = $this->set_external_attrs( $attrs );
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if ( $this->is_dirty ) {
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$new = '<a' . HTML::attributes_to_string( $attrs ) . '>';
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$content = str_replace( $link, $new, $content );
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}
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}
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return $content;
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}
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/**
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* Set rel attribute.
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*
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* @param array $attrs Array which hold rel attribute.
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* @param string $property Property to add.
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* @param boolean $append Append or not.
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*/
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private function set_rel_attribute( &$attrs, $property, $append ) {
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if ( empty( $attrs['rel'] ) ) {
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$attrs['rel'] = $property;
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return;
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}
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if ( $append ) {
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$attrs['rel'] .= ' ' . $property;
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}
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}
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/**
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* Check if we can do anything
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*
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* @param array $attrs Array of link attributes.
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*
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* @return boolean
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*/
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private function can_add_attributes( $attrs ) {
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// If link has no href attribute or if the link is not valid then we don't need to do anything.
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if (
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empty( $attrs['href'] ) ||
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( empty( wp_parse_url( $attrs['href'], PHP_URL_HOST ) ) && ! Url::is_affiliate( $attrs['href'] ) ) ||
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( isset( $attrs['role'] ) && 'button' === $attrs['role'] )
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) {
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return false;
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}
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return true;
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}
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/**
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* Remove rank-math-link class.
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*
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* @since 1.0.44.2
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*
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* @param array $attrs Array of link attributes.
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*
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* @return array $attrs
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*/
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private function remove_link_class( $attrs ) {
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if ( ! $this->remove_class || empty( $attrs['class'] ) || strpos( $attrs['class'], 'rank-math-link' ) === false ) {
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return $attrs;
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}
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$this->is_dirty = true;
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$attrs['class'] = str_replace( 'rank-math-link', '', $attrs['class'] );
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if ( ! trim( $attrs['class'] ) ) {
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unset( $attrs['class'] );
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}
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return $attrs;
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}
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/**
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* Set External attributs
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*
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* @since 1.0.44.2
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*
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* @param array $attrs Array of link attributes.
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*
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* @return array $attrs
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*/
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private function set_external_attrs( $attrs ) {
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if ( ! $this->add_attributes ) {
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return $attrs;
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}
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// Skip if there is no href or it's a hash link like "#id".
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// Skip if relative link.
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// Skip for same domain ignoring sub-domain if any.
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if ( ! Url::is_external( $attrs['href'] ) ) {
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return $attrs;
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}
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if ( $this->do_filter( 'nofollow/url', $this->should_add_nofollow( $attrs['href'] ), $attrs['href'] ) ) {
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if ( $this->nofollow_link || ( $this->nofollow_image && $this->is_valid_image( $attrs['href'] ) ) ) {
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$this->is_dirty = true;
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$this->set_rel_attribute( $attrs, 'nofollow', ( isset( $attrs['rel'] ) && ! Str::contains( 'dofollow', $attrs['rel'] ) && ! Str::contains( 'nofollow', $attrs['rel'] ) ) );
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}
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}
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if ( $this->new_window_link && ! isset( $attrs['target'] ) ) {
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$this->is_dirty = true;
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$attrs['target'] = '_blank';
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}
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if ( $this->add_noopener && $this->do_filter( 'noopener/domain', Url::get_domain( $attrs['href'] ) ) ) {
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$this->is_dirty = true;
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$this->set_rel_attribute( $attrs, 'noopener', ( isset( $attrs['rel'] ) && ! Str::contains( 'noopener', $attrs['rel'] ) ) );
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}
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if ( Url::is_affiliate( $attrs['href'] ) ) {
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$this->is_dirty = true;
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$this->set_rel_attribute( $attrs, 'sponsored', ( isset( $attrs['rel'] ) && ! Str::contains( 'sponsored', $attrs['rel'] ) ) );
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}
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return $attrs;
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}
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/**
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* Check if we need to add nofollow for this link, based on "nofollow_domains" & "nofollow_exclude_domains"
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*
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* @param string $url Link URL.
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* @return bool
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*/
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private function should_add_nofollow( $url ) {
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if ( ! $this->nofollow_link && ! $this->nofollow_image ) {
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return false;
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}
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$include_domains = $this->get_nofollow_domains( 'include' );
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$exclude_domains = $this->get_nofollow_domains( 'exclude' );
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$parent_domain = Url::get_domain( $url );
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$parent_domain = preg_replace( '/^www\./', '', $parent_domain );
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// Check if domain is in list.
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if ( ! empty( $include_domains ) ) {
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return in_array( $parent_domain, $include_domains, true );
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}
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// Check if domain is NOT in list.
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if ( ! empty( $exclude_domains ) && in_array( $parent_domain, $exclude_domains, true ) ) {
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return false;
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}
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return true;
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}
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/**
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* Get domain for nofollow
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*
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* @param string $type Type either include or exclude.
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* @return array
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*/
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private function get_nofollow_domains( $type ) {
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static $rank_math_nofollow_domains;
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if ( isset( $rank_math_nofollow_domains[ $type ] ) ) {
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return $rank_math_nofollow_domains[ $type ];
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}
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$setting = 'include' === $type ? 'nofollow_domains' : 'nofollow_exclude_domains';
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$domains = Helper::get_settings( "general.{$setting}" );
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$domains = Str::to_arr_no_empty( $domains );
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// Strip off www. prefixes.
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$domains = array_map(
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function( $domain ) {
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$domain = preg_replace( '#^http(s)?://#', '', trim( $domain, '/' ) );
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return preg_replace( '/^www\./', '', $domain );
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},
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$domains
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);
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$rank_math_nofollow_domains[ $type ] = $domains;
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return $rank_math_nofollow_domains[ $type ];
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}
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/**
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* Is a valid image url.
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*
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* @param string $url Image url.
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*
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* @return boolean
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*/
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private function is_valid_image( $url ) {
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foreach ( [ '.jpg', '.jpeg', '.png', '.gif' ] as $ext ) {
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if ( Str::contains( $ext, $url ) ) {
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return true;
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}
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}
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return false;
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}
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}
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