241 lines
7.7 KiB
PHP
241 lines
7.7 KiB
PHP
<?php
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/**
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* Error Protection API: WP_Fatal_Error_Handler class
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*
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* @package WordPress
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* @since 5.2.0
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*/
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/**
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* Core class used as the default shutdown handler for fatal errors.
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*
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* A drop-in 'fatal-error-handler.php' can be used to override the instance of this class and use a custom
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* implementation for the fatal error handler that WordPress registers. The custom class should extend this class and
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* can override its methods individually as necessary. The file must return the instance of the class that should be
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* registered.
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*
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* @since 5.2.0
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*/
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#[AllowDynamicProperties]
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class WP_Fatal_Error_Handler {
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/**
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* Runs the shutdown handler.
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*
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* This method is registered via `register_shutdown_function()`.
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*
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* @since 5.2.0
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*/
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public function handle() {
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if ( defined( 'WP_SANDBOX_SCRAPING' ) && WP_SANDBOX_SCRAPING ) {
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return;
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}
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// Do not trigger the fatal error handler while updates are being installed.
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if ( wp_is_maintenance_mode() ) {
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return;
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}
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try {
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// Bail if no error found.
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$error = $this->detect_error();
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if ( ! $error ) {
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return;
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}
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if ( ! isset( $GLOBALS['wp_locale'] ) && function_exists( 'load_default_textdomain' ) ) {
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load_default_textdomain();
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}
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$handled = false;
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if ( ! is_multisite() && wp_recovery_mode()->is_initialized() ) {
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$handled = wp_recovery_mode()->handle_error( $error );
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}
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// Display the PHP error template if headers not sent.
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if ( is_admin() || ! headers_sent() ) {
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$this->display_error_template( $error, $handled );
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}
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} catch ( Exception $e ) {
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// Catch exceptions and remain silent.
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}
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}
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/**
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* Detects the error causing the crash if it should be handled.
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*
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* @since 5.2.0
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*
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* @return array|null Error information returned by `error_get_last()`, or null
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* if none was recorded or the error should not be handled.
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*/
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protected function detect_error() {
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$error = error_get_last();
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// No error, just skip the error handling code.
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if ( null === $error ) {
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return null;
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}
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// Bail if this error should not be handled.
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if ( ! $this->should_handle_error( $error ) ) {
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return null;
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}
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return $error;
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}
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/**
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* Determines whether we are dealing with an error that WordPress should handle
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* in order to protect the admin backend against WSODs.
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*
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* @since 5.2.0
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*
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* @param array $error Error information retrieved from `error_get_last()`.
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* @return bool Whether WordPress should handle this error.
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*/
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protected function should_handle_error( $error ) {
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$error_types_to_handle = array(
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E_ERROR,
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E_PARSE,
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E_USER_ERROR,
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E_COMPILE_ERROR,
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E_RECOVERABLE_ERROR,
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);
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if ( isset( $error['type'] ) && in_array( $error['type'], $error_types_to_handle, true ) ) {
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return true;
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}
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/**
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* Filters whether a given thrown error should be handled by the fatal error handler.
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*
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* This filter is only fired if the error is not already configured to be handled by WordPress core. As such,
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* it exclusively allows adding further rules for which errors should be handled, but not removing existing
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* ones.
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*
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* @since 5.2.0
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*
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* @param bool $should_handle_error Whether the error should be handled by the fatal error handler.
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* @param array $error Error information retrieved from `error_get_last()`.
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*/
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return (bool) apply_filters( 'wp_should_handle_php_error', false, $error );
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}
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/**
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* Displays the PHP error template and sends the HTTP status code, typically 500.
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*
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* A drop-in 'php-error.php' can be used as a custom template. This drop-in should control the HTTP status code and
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* print the HTML markup indicating that a PHP error occurred. Note that this drop-in may potentially be executed
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* very early in the WordPress bootstrap process, so any core functions used that are not part of
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* `wp-includes/load.php` should be checked for before being called.
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*
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* If no such drop-in is available, this will call {@see WP_Fatal_Error_Handler::display_default_error_template()}.
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*
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* @since 5.2.0
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* @since 5.3.0 The `$handled` parameter was added.
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*
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* @param array $error Error information retrieved from `error_get_last()`.
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* @param true|WP_Error $handled Whether Recovery Mode handled the fatal error.
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*/
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protected function display_error_template( $error, $handled ) {
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if ( defined( 'WP_CONTENT_DIR' ) ) {
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// Load custom PHP error template, if present.
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$php_error_pluggable = WP_CONTENT_DIR . '/php-error.php';
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if ( is_readable( $php_error_pluggable ) ) {
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require_once $php_error_pluggable;
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return;
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}
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}
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// Otherwise, display the default error template.
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$this->display_default_error_template( $error, $handled );
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}
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/**
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* Displays the default PHP error template.
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*
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* This method is called conditionally if no 'php-error.php' drop-in is available.
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*
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* It calls {@see wp_die()} with a message indicating that the site is experiencing technical difficulties and a
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* login link to the admin backend. The {@see 'wp_php_error_message'} and {@see 'wp_php_error_args'} filters can
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* be used to modify these parameters.
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*
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* @since 5.2.0
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* @since 5.3.0 The `$handled` parameter was added.
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*
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* @param array $error Error information retrieved from `error_get_last()`.
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* @param true|WP_Error $handled Whether Recovery Mode handled the fatal error.
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*/
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protected function display_default_error_template( $error, $handled ) {
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if ( ! function_exists( '__' ) ) {
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wp_load_translations_early();
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}
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if ( ! function_exists( 'wp_die' ) ) {
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require_once ABSPATH . WPINC . '/functions.php';
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}
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if ( ! class_exists( 'WP_Error' ) ) {
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require_once ABSPATH . WPINC . '/class-wp-error.php';
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}
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if ( true === $handled && wp_is_recovery_mode() ) {
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$message = __( 'There has been a critical error on this website, putting it in recovery mode. Please check the Themes and Plugins screens for more details. If you just installed or updated a theme or plugin, check the relevant page for that first.' );
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} elseif ( is_protected_endpoint() && wp_recovery_mode()->is_initialized() ) {
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if ( is_multisite() ) {
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$message = __( 'There has been a critical error on this website. Please reach out to your site administrator, and inform them of this error for further assistance.' );
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} else {
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$message = __( 'There has been a critical error on this website. Please check your site admin email inbox for instructions.' );
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}
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} else {
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$message = __( 'There has been a critical error on this website.' );
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}
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$message = sprintf(
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'<p>%s</p><p><a href="%s">%s</a></p>',
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$message,
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/* translators: Documentation about troubleshooting. */
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__( 'https://wordpress.org/documentation/article/faq-troubleshooting/' ),
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__( 'Learn more about troubleshooting WordPress.' )
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);
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$args = array(
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'response' => 500,
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'exit' => false,
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);
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/**
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* Filters the message that the default PHP error template displays.
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*
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* @since 5.2.0
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*
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* @param string $message HTML error message to display.
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* @param array $error Error information retrieved from `error_get_last()`.
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*/
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$message = apply_filters( 'wp_php_error_message', $message, $error );
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/**
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* Filters the arguments passed to {@see wp_die()} for the default PHP error template.
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*
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* @since 5.2.0
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*
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* @param array $args Associative array of arguments passed to `wp_die()`. By default these contain a
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* 'response' key, and optionally 'link_url' and 'link_text' keys.
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* @param array $error Error information retrieved from `error_get_last()`.
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*/
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$args = apply_filters( 'wp_php_error_args', $args, $error );
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$wp_error = new WP_Error(
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'internal_server_error',
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$message,
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array(
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'error' => $error,
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)
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);
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wp_die( $wp_error, '', $args );
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}
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}
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