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<?php

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namespace Yoast\WP\SEO\Integrations\Front_End;

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use Yoast\WP\SEO\Conditionals\Front_End_Conditional;

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use Yoast\WP\SEO\Helpers\Robots_Helper;

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use Yoast\WP\SEO\Integrations\Integration_Interface;

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/**

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* Class Indexing_Controls.

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class Indexing_Controls implements Integration_Interface {

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/**

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* The robots helper.

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* @var Robots_Helper

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protected $robots;

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/**

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* Returns the conditionals based in which this loadable should be active.

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* @return array

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public static function get_conditionals() {

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return [ Front_End_Conditional::class ];

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}

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/**

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* The constructor.

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* @codeCoverageIgnore Sets the dependencies.

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* @param Robots_Helper $robots The robots helper.

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public function __construct( Robots_Helper $robots ) {

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$this->robots = $robots;

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}

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/**

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* Initializes the integration.

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* This is the place to register hooks and filters.

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* @codeCoverageIgnore

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* @return void

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public function register_hooks() {

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// The option `blog_public` is set in Settings > Reading > Search Engine Visibility.

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if ( (string) \get_option( 'blog_public' ) === '0' ) {

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\add_filter( 'wpseo_robots_array', [ $this->robots, 'set_robots_no_index' ] );

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}

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\add_action( 'template_redirect', [ $this, 'noindex_robots' ] );

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\add_filter( 'loginout', [ $this, 'nofollow_link' ] );

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\add_filter( 'register', [ $this, 'nofollow_link' ] );

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// Remove actions that we will handle through our wpseo_head call, and probably change the output of.

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\remove_action( 'wp_head', 'rel_canonical' );

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\remove_action( 'wp_head', 'index_rel_link' );

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\remove_action( 'wp_head', 'start_post_rel_link' );

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\remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head' );

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\remove_action( 'wp_head', 'noindex', 1 );

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}

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/**

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* Sends a Robots HTTP header preventing URL from being indexed in the search results while allowing search engines

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* to follow the links in the object at the URL.

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* @return bool Boolean indicating whether the noindex header was sent.

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public function noindex_robots() {

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if ( ! \is_robots() ) {

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return false;

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}

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return $this->set_robots_header();

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}

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/**

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* Adds rel="nofollow" to a link, only used for login / registration links.

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* @param string $input The link element as a string.

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* @return string

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public function nofollow_link( $input ) {

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return \str_replace( '<a ', '<a rel="nofollow" ', $input );

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}

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/**

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* Sets the x-robots-tag to noindex follow.

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* @codeCoverageIgnore Too difficult to test.

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* @return bool

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protected function set_robots_header() {

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if ( \headers_sent() === false ) {

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\header( 'X-Robots-Tag: noindex, follow', true );

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return true;

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}

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return false;

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}

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}

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