angelovcom.net

https-detection.php (6871B)

---

 <?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;
 }