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See #53399 Built from https://develop.svn.wordpress.org/trunk@52332 git-svn-id: http://core.svn.wordpress.org/trunk@51924 1a063a9b-81f0-0310-95a4-ce76da25c4cd
228 lines
6.7 KiB
PHP
228 lines
6.7 KiB
PHP
<?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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// 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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/** 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( $site_url, PHP_URL_SCHEME );
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}
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/**
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* Checks whether HTTPS is supported for the server and domain.
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*
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* @since 5.7.0
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*
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* @return bool True if HTTPS is supported, false otherwise.
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*/
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function wp_is_https_supported() {
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$https_detection_errors = get_option( 'https_detection_errors' );
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// If option has never been set by the Cron hook before, run it on-the-fly as fallback.
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if ( false === $https_detection_errors ) {
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wp_update_https_detection_errors();
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$https_detection_errors = get_option( 'https_detection_errors' );
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}
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// If there are no detection errors, HTTPS is 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 internal function is called by a regular Cron hook to ensure HTTPS support is detected and maintained.
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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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function wp_update_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 5.7.0
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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_update_https_detection_errors', null );
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if ( is_wp_error( $support_errors ) ) {
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update_option( 'https_detection_errors', $support_errors->errors );
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return;
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}
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$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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update_option( 'https_detection_errors', $support_errors->errors );
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}
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/**
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* Schedules the Cron hook for detecting HTTPS support.
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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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function wp_schedule_https_detection() {
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if ( wp_installing() ) {
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return;
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}
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if ( ! wp_next_scheduled( 'wp_https_detection' ) ) {
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wp_schedule_event( time(), 'twicedaily', 'wp_https_detection' );
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}
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}
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/**
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* Disables SSL verification if the 'cron_request' arguments include an HTTPS URL.
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*
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* This prevents an issue if HTTPS breaks, where there would be a failed attempt to verify HTTPS.
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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 array $request The Cron request arguments.
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* @return array The filtered Cron request arguments.
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*/
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function wp_cron_conditionally_prevent_sslverify( $request ) {
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if ( 'https' === wp_parse_url( $request['url'], PHP_URL_SCHEME ) ) {
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$request['args']['sslverify'] = false;
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}
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return $request;
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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 false !== strpos( $html, $pattern );
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}
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// 2. Check if HTML includes the site's Windows Live Writer manifest link.
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if ( has_action( 'wp_head', 'wlwmanifest_link' ) ) {
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// Try both HTTPS and HTTP since the URL depends on context.
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$pattern = preg_replace( '#^https?:(?=//)#', '', includes_url( 'wlwmanifest.xml' ) ); // See wlwmanifest_link().
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return false !== strpos( $html, $pattern );
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}
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// 3. Check if HTML includes the site's REST API link.
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if ( has_action( 'wp_head', 'rest_output_link_wp_head' ) ) {
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// Try both HTTPS and HTTP since the URL depends on context.
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$pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( get_rest_url() ) ); // See rest_output_link_wp_head().
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return false !== strpos( $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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