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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\Options_Helper;

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use Yoast\WP\SEO\Integrations\Integration_Interface;

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/**

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* Class Crawl_Cleanup_Basic.

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class Crawl_Cleanup_Basic implements Integration_Interface {

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/**

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* The options helper.

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* @var Options_Helper

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private $options_helper;

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/**

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* Crawl Cleanup Basic integration constructor.

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* @param Options_Helper $options_helper The option helper.

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public function __construct( Options_Helper $options_helper ) {

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$this->options_helper = $options_helper;

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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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* @return void

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public function register_hooks() {

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// Remove HTTP headers we don't want.

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\add_action( 'wp', [ $this, 'clean_headers' ], 0 );

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if ( $this->is_true( 'remove_shortlinks' ) ) {

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// Remove shortlinks.

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

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\remove_action( 'template_redirect', 'wp_shortlink_header', 11 );

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}

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if ( $this->is_true( 'remove_rest_api_links' ) ) {

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// Remove REST API links.

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

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\remove_action( 'template_redirect', 'rest_output_link_header', 11 );

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}

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if ( $this->is_true( 'remove_rsd_wlw_links' ) ) {

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// Remove RSD and WLW Manifest links.

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

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\remove_action( 'xmlrpc_rsd_apis', 'rest_output_rsd' );

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

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}

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if ( $this->is_true( 'remove_oembed_links' ) ) {

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// Remove JSON+XML oEmbed links.

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

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}

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if ( $this->is_true( 'remove_generator' ) ) {

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

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}

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if ( $this->is_true( 'remove_emoji_scripts' ) ) {

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// Remove emoji scripts and additional stuff they cause.

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\remove_action( 'wp_head', 'print_emoji_detection_script', 7 );

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\remove_action( 'wp_print_styles', 'print_emoji_styles' );

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\remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );

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\remove_action( 'admin_print_styles', 'print_emoji_styles' );

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\add_filter( 'wp_resource_hints', [ $this, 'resource_hints_plain_cleanup' ], 1 );

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}

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}

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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 The array of conditionals.

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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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* Removes X-Pingback and X-Powered-By headers as they're unneeded.

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* @return void

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public function clean_headers() {

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if ( \headers_sent() ) {

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return;

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}

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if ( $this->is_true( 'remove_powered_by_header' ) ) {

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\header_remove( 'X-Powered-By' );

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}

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if ( $this->is_true( 'remove_pingback_header' ) ) {

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\header_remove( 'X-Pingback' );

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}

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}

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/**

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* Remove the core s.w.org hint as it's only used for emoji stuff we don't use.

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* @param array $hints The hints we're adding to.

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* @return array

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public function resource_hints_plain_cleanup( $hints ) {

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foreach ( $hints as $key => $hint ) {

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if ( \is_array( $hint ) && isset( $hint['href'] ) ) {

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if ( \strpos( $hint['href'], '//s.w.org' ) !== false ) {

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unset( $hints[ $key ] );

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}

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}

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elseif ( \strpos( $hint, '//s.w.org' ) !== false ) {

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unset( $hints[ $key ] );

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}

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}

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return $hints;

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}

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/**

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* Checks if the value of an option is set to true.

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* @param string $option_name The option name.

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* @return bool

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private function is_true( $option_name ) {

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return $this->options_helper->get( $option_name ) === true;

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}

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}

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