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<?php namespace Yoast\WP\SEO\Integrations\Front_End; use Yoast\WP\SEO\Conditionals\Front_End_Conditional; use Yoast\WP\SEO\Helpers\Robots_Helper; use Yoast\WP\SEO\Integrations\Integration_Interface; /** * Class Indexing_Controls. */ class Indexing_Controls implements Integration_Interface { /** * The robots helper. * * @var Robots_Helper */ protected $robots; /** * Returns the conditionals based in which this loadable should be active. * * @return array */ public static function get_conditionals() { return [ Front_End_Conditional::class ]; } /** * The constructor. * * @codeCoverageIgnore Sets the dependencies. * * @param Robots_Helper $robots The robots helper. */ public function __construct( Robots_Helper $robots ) { $this->robots = $robots; } /** * Initializes the integration. * * This is the place to register hooks and filters. * * @codeCoverageIgnore * * @return void */ public function register_hooks() { // The option `blog_public` is set in Settings > Reading > Search Engine Visibility. if ( (string) \get_option( 'blog_public' ) === '0' ) { \add_filter( 'wpseo_robots_array', [ $this->robots, 'set_robots_no_index' ] ); } \add_action( 'template_redirect', [ $this, 'noindex_robots' ] ); \add_filter( 'loginout', [ $this, 'nofollow_link' ] ); \add_filter( 'register', [ $this, 'nofollow_link' ] ); // Remove actions that we will handle through our wpseo_head call, and probably change the output of. \remove_action( 'wp_head', 'rel_canonical' ); \remove_action( 'wp_head', 'index_rel_link' ); \remove_action( 'wp_head', 'start_post_rel_link' ); \remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head' ); \remove_action( 'wp_head', 'noindex', 1 ); } /** * Sends a Robots HTTP header preventing URL from being indexed in the search results while allowing search engines * to follow the links in the object at the URL. * * @return bool Boolean indicating whether the noindex header was sent. */ public function noindex_robots() { if ( ! \is_robots() ) { return false; } return $this->set_robots_header(); } /** * Adds rel="nofollow" to a link, only used for login / registration links. * * @param string $input The link element as a string. * * @return string */ public function nofollow_link( $input ) { return \str_replace( '<a ', '<a rel="nofollow" ', $input ); } /** * Sets the x-robots-tag to noindex follow. * * @codeCoverageIgnore Too difficult to test. * * @return bool */ protected function set_robots_header() { if ( \headers_sent() === false ) { \header( 'X-Robots-Tag: noindex, follow', true ); return true; } return false; } }
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