<?php

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/**

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* HTTPS detection functions.

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*

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* @package WordPress

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* @since 5.7.0

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*/

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/**

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* Checks whether the website is using HTTPS.

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*

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* This is based on whether both the home and site URL are using HTTPS.

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*

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* @since 5.7.0

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* @see wp_is_home_url_using_https()

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* @see wp_is_site_url_using_https()

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*

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* @return bool True if using HTTPS, false otherwise.

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*/

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function wp_is_using_https() {

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if ( ! wp_is_home_url_using_https() ) {

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return false;

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}

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return wp_is_site_url_using_https();

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}

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/**

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* Checks whether the current site URL is using HTTPS.

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*

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* @since 5.7.0

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* @see home_url()

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*

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* @return bool True if using HTTPS, false otherwise.

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*/

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function wp_is_home_url_using_https() {

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return 'https' === wp_parse_url( home_url(), PHP_URL_SCHEME );

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}

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/**

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* Checks whether the current site's URL where WordPress is stored is using HTTPS.

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*

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* This checks the URL where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder)

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* are accessible.

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*

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* @since 5.7.0

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* @see site_url()

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*

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* @return bool True if using HTTPS, false otherwise.

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*/

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function wp_is_site_url_using_https() {

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/*

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* Use direct option access for 'siteurl' and manually run the 'site_url'

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* filter because `site_url()` will adjust the scheme based on what the

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* current request is using.

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*/

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/** This filter is documented in wp-includes/link-template.php */

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$site_url = apply_filters( 'site_url', get_option( 'siteurl' ), '', null, null );

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return 'https' === wp_parse_url( $site_url, PHP_URL_SCHEME );

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}

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/**

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* Checks whether HTTPS is supported for the server and domain.

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*

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* This function makes an HTTP request through `wp_get_https_detection_errors()`

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* to check for HTTPS support. As this process can be resource-intensive,

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* it should be used cautiously, especially in performance-sensitive environments,

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* to avoid potential latency issues.

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*

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* @since 5.7.0

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*

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* @return bool True if HTTPS is supported, false otherwise.

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*/

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function wp_is_https_supported() {

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$https_detection_errors = wp_get_https_detection_errors();

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// If there are errors, HTTPS is not supported.

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return empty( $https_detection_errors );

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}

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/**

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* Runs a remote HTTPS request to detect whether HTTPS supported, and stores potential errors.

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*

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* This function checks for HTTPS support by making an HTTP request. As this process can be resource-intensive,

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* it should be used cautiously, especially in performance-sensitive environments.

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* It is called when HTTPS support needs to be validated.

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*

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* @since 6.4.0

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* @access private

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*

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* @return array An array containing potential detection errors related to HTTPS, or an empty array if no errors are found.

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*/

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function wp_get_https_detection_errors() {

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/**

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* Short-circuits the process of detecting errors related to HTTPS support.

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*

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* Returning a `WP_Error` from the filter will effectively short-circuit the default logic of trying a remote

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* request to the site over HTTPS, storing the errors array from the returned `WP_Error` instead.

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*

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* @since 6.4.0

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*

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* @param null|WP_Error $pre Error object to short-circuit detection,

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* or null to continue with the default behavior.

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*/

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$support_errors = apply_filters( 'pre_wp_get_https_detection_errors', null );

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if ( is_wp_error( $support_errors ) ) {

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return $support_errors->errors;

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}

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$support_errors = new WP_Error();

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$response = wp_remote_request(

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home_url( '/', 'https' ),

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array(

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'headers' => array(

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'Cache-Control' => 'no-cache',

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),

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'sslverify' => true,

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)

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);

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if ( is_wp_error( $response ) ) {

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$unverified_response = wp_remote_request(

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home_url( '/', 'https' ),

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array(

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'headers' => array(

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'Cache-Control' => 'no-cache',

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),

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'sslverify' => false,

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)

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);

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if ( is_wp_error( $unverified_response ) ) {

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$support_errors->add(

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'https_request_failed',

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__( 'HTTPS request failed.' )

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);

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} else {

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$support_errors->add(

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'ssl_verification_failed',

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__( 'SSL verification failed.' )

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);

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}

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$response = $unverified_response;

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}

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if ( ! is_wp_error( $response ) ) {

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if ( 200 !== wp_remote_retrieve_response_code( $response ) ) {

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$support_errors->add( 'bad_response_code', wp_remote_retrieve_response_message( $response ) );

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} elseif ( false === wp_is_local_html_output( wp_remote_retrieve_body( $response ) ) ) {

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$support_errors->add( 'bad_response_source', __( 'It looks like the response did not come from this site.' ) );

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}

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}

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return $support_errors->errors;

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}

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/**

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* Checks whether a given HTML string is likely an output from this WordPress site.

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*

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* This function attempts to check for various common WordPress patterns whether they are included in the HTML string.

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* Since any of these actions may be disabled through third-party code, this function may also return null to indicate

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* that it was not possible to determine ownership.

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*

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* @since 5.7.0

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* @access private

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*

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* @param string $html Full HTML output string, e.g. from a HTTP response.

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* @return bool|null True/false for whether HTML was generated by this site, null if unable to determine.

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*/

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function wp_is_local_html_output( $html ) {

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// 1. Check if HTML includes the site's Really Simple Discovery link.

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if ( has_action( 'wp_head', 'rsd_link' ) ) {

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$pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( site_url( 'xmlrpc.php?rsd', 'rpc' ) ) ); // See rsd_link().

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return str_contains( $html, $pattern );

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}

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// 2. Check if HTML includes the site's REST API link.

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if ( has_action( 'wp_head', 'rest_output_link_wp_head' ) ) {

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// Try both HTTPS and HTTP since the URL depends on context.

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$pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( get_rest_url() ) ); // See rest_output_link_wp_head().

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return str_contains( $html, $pattern );

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}

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// Otherwise the result cannot be determined.

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return null;

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}

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