--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/https-detection.php Wed Sep 21 18:19:35 2022 +0200
@@ -0,0 +1,227 @@
+<?php
+/**
+ * HTTPS detection functions.
+ *
+ * @package WordPress
+ * @since 5.7.0
+ */
+
+/**
+ * Checks whether the website is using HTTPS.
+ *
+ * This is based on whether both the home and site URL are using HTTPS.
+ *
+ * @since 5.7.0
+ * @see wp_is_home_url_using_https()
+ * @see wp_is_site_url_using_https()
+ *
+ * @return bool True if using HTTPS, false otherwise.
+ */
+function wp_is_using_https() {
+ if ( ! wp_is_home_url_using_https() ) {
+ return false;
+ }
+
+ return wp_is_site_url_using_https();
+}
+
+/**
+ * Checks whether the current site URL is using HTTPS.
+ *
+ * @since 5.7.0
+ * @see home_url()
+ *
+ * @return bool True if using HTTPS, false otherwise.
+ */
+function wp_is_home_url_using_https() {
+ return 'https' === wp_parse_url( home_url(), PHP_URL_SCHEME );
+}
+
+/**
+ * Checks whether the current site's URL where WordPress is stored is using HTTPS.
+ *
+ * This checks the URL where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder)
+ * are accessible.
+ *
+ * @since 5.7.0
+ * @see site_url()
+ *
+ * @return bool True if using HTTPS, false otherwise.
+ */
+function wp_is_site_url_using_https() {
+ // Use direct option access for 'siteurl' and manually run the 'site_url'
+ // filter because `site_url()` will adjust the scheme based on what the
+ // current request is using.
+ /** This filter is documented in wp-includes/link-template.php */
+ $site_url = apply_filters( 'site_url', get_option( 'siteurl' ), '', null, null );
+
+ return 'https' === wp_parse_url( $site_url, PHP_URL_SCHEME );
+}
+
+/**
+ * Checks whether HTTPS is supported for the server and domain.
+ *
+ * @since 5.7.0
+ *
+ * @return bool True if HTTPS is supported, false otherwise.
+ */
+function wp_is_https_supported() {
+ $https_detection_errors = get_option( 'https_detection_errors' );
+
+ // If option has never been set by the Cron hook before, run it on-the-fly as fallback.
+ if ( false === $https_detection_errors ) {
+ wp_update_https_detection_errors();
+
+ $https_detection_errors = get_option( 'https_detection_errors' );
+ }
+
+ // If there are no detection errors, HTTPS is supported.
+ return empty( $https_detection_errors );
+}
+
+/**
+ * Runs a remote HTTPS request to detect whether HTTPS supported, and stores potential errors.
+ *
+ * This internal function is called by a regular Cron hook to ensure HTTPS support is detected and maintained.
+ *
+ * @since 5.7.0
+ * @access private
+ */
+function wp_update_https_detection_errors() {
+ /**
+ * Short-circuits the process of detecting errors related to HTTPS support.
+ *
+ * Returning a `WP_Error` from the filter will effectively short-circuit the default logic of trying a remote
+ * request to the site over HTTPS, storing the errors array from the returned `WP_Error` instead.
+ *
+ * @since 5.7.0
+ *
+ * @param null|WP_Error $pre Error object to short-circuit detection,
+ * or null to continue with the default behavior.
+ */
+ $support_errors = apply_filters( 'pre_wp_update_https_detection_errors', null );
+ if ( is_wp_error( $support_errors ) ) {
+ update_option( 'https_detection_errors', $support_errors->errors );
+ return;
+ }
+
+ $support_errors = new WP_Error();
+
+ $response = wp_remote_request(
+ home_url( '/', 'https' ),
+ array(
+ 'headers' => array(
+ 'Cache-Control' => 'no-cache',
+ ),
+ 'sslverify' => true,
+ )
+ );
+
+ if ( is_wp_error( $response ) ) {
+ $unverified_response = wp_remote_request(
+ home_url( '/', 'https' ),
+ array(
+ 'headers' => array(
+ 'Cache-Control' => 'no-cache',
+ ),
+ 'sslverify' => false,
+ )
+ );
+
+ if ( is_wp_error( $unverified_response ) ) {
+ $support_errors->add(
+ 'https_request_failed',
+ __( 'HTTPS request failed.' )
+ );
+ } else {
+ $support_errors->add(
+ 'ssl_verification_failed',
+ __( 'SSL verification failed.' )
+ );
+ }
+
+ $response = $unverified_response;
+ }
+
+ if ( ! is_wp_error( $response ) ) {
+ if ( 200 !== wp_remote_retrieve_response_code( $response ) ) {
+ $support_errors->add( 'bad_response_code', wp_remote_retrieve_response_message( $response ) );
+ } elseif ( false === wp_is_local_html_output( wp_remote_retrieve_body( $response ) ) ) {
+ $support_errors->add( 'bad_response_source', __( 'It looks like the response did not come from this site.' ) );
+ }
+ }
+
+ update_option( 'https_detection_errors', $support_errors->errors );
+}
+
+/**
+ * Schedules the Cron hook for detecting HTTPS support.
+ *
+ * @since 5.7.0
+ * @access private
+ */
+function wp_schedule_https_detection() {
+ if ( wp_installing() ) {
+ return;
+ }
+
+ if ( ! wp_next_scheduled( 'wp_https_detection' ) ) {
+ wp_schedule_event( time(), 'twicedaily', 'wp_https_detection' );
+ }
+}
+
+/**
+ * Disables SSL verification if the 'cron_request' arguments include an HTTPS URL.
+ *
+ * This prevents an issue if HTTPS breaks, where there would be a failed attempt to verify HTTPS.
+ *
+ * @since 5.7.0
+ * @access private
+ *
+ * @param array $request The Cron request arguments.
+ * @return array $request The filtered Cron request arguments.
+ */
+function wp_cron_conditionally_prevent_sslverify( $request ) {
+ if ( 'https' === wp_parse_url( $request['url'], PHP_URL_SCHEME ) ) {
+ $request['args']['sslverify'] = false;
+ }
+ return $request;
+}
+
+/**
+ * Checks whether a given HTML string is likely an output from this WordPress site.
+ *
+ * This function attempts to check for various common WordPress patterns whether they are included in the HTML string.
+ * Since any of these actions may be disabled through third-party code, this function may also return null to indicate
+ * that it was not possible to determine ownership.
+ *
+ * @since 5.7.0
+ * @access private
+ *
+ * @param string $html Full HTML output string, e.g. from a HTTP response.
+ * @return bool|null True/false for whether HTML was generated by this site, null if unable to determine.
+ */
+function wp_is_local_html_output( $html ) {
+ // 1. Check if HTML includes the site's Really Simple Discovery link.
+ if ( has_action( 'wp_head', 'rsd_link' ) ) {
+ $pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( site_url( 'xmlrpc.php?rsd', 'rpc' ) ) ); // See rsd_link().
+ return false !== strpos( $html, $pattern );
+ }
+
+ // 2. Check if HTML includes the site's Windows Live Writer manifest link.
+ if ( has_action( 'wp_head', 'wlwmanifest_link' ) ) {
+ // Try both HTTPS and HTTP since the URL depends on context.
+ $pattern = preg_replace( '#^https?:(?=//)#', '', includes_url( 'wlwmanifest.xml' ) ); // See wlwmanifest_link().
+ return false !== strpos( $html, $pattern );
+ }
+
+ // 3. Check if HTML includes the site's REST API link.
+ if ( has_action( 'wp_head', 'rest_output_link_wp_head' ) ) {
+ // Try both HTTPS and HTTP since the URL depends on context.
+ $pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( get_rest_url() ) ); // See rest_output_link_wp_head().
+ return false !== strpos( $html, $pattern );
+ }
+
+ // Otherwise the result cannot be determined.
+ return null;
+}