--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/class-wp-fatal-error-handler.php Mon Oct 14 18:28:13 2019 +0200
@@ -0,0 +1,214 @@
+<?php
+/**
+ * Error Protection API: WP_Fatal_Error_Handler class
+ *
+ * @package WordPress
+ * @since 5.2.0
+ */
+
+/**
+ * Core class used as the default shutdown handler for fatal errors.
+ *
+ * A drop-in 'fatal-error-handler.php' can be used to override the instance of this class and use a custom
+ * implementation for the fatal error handler that WordPress registers. The custom class should extend this class and
+ * can override its methods individually as necessary. The file must return the instance of the class that should be
+ * registered.
+ *
+ * @since 5.2.0
+ */
+class WP_Fatal_Error_Handler {
+
+ /**
+ * Runs the shutdown handler.
+ *
+ * This method is registered via `register_shutdown_function()`.
+ *
+ * @since 5.2.0
+ */
+ public function handle() {
+ if ( defined( 'WP_SANDBOX_SCRAPING' ) && WP_SANDBOX_SCRAPING ) {
+ return;
+ }
+
+ try {
+ // Bail if no error found.
+ $error = $this->detect_error();
+ if ( ! $error ) {
+ return;
+ }
+
+ if ( ! isset( $GLOBALS['wp_locale'] ) && function_exists( 'load_default_textdomain' ) ) {
+ load_default_textdomain();
+ }
+
+ if ( ! is_multisite() && wp_recovery_mode()->is_initialized() ) {
+ wp_recovery_mode()->handle_error( $error );
+ }
+
+ // Display the PHP error template if headers not sent.
+ if ( is_admin() || ! headers_sent() ) {
+ $this->display_error_template( $error );
+ }
+ } catch ( Exception $e ) {
+ // Catch exceptions and remain silent.
+ }
+ }
+
+ /**
+ * Detects the error causing the crash if it should be handled.
+ *
+ * @since 5.2.0
+ *
+ * @return array|null Error that was triggered, or null if no error received or if the error should not be handled.
+ */
+ protected function detect_error() {
+ $error = error_get_last();
+
+ // No error, just skip the error handling code.
+ if ( null === $error ) {
+ return null;
+ }
+
+ // Bail if this error should not be handled.
+ if ( ! $this->should_handle_error( $error ) ) {
+ return null;
+ }
+
+ return $error;
+ }
+
+ /**
+ * Determines whether we are dealing with an error that WordPress should handle
+ * in order to protect the admin backend against WSODs.
+ *
+ * @since 5.2.0
+ *
+ * @param array $error Error information retrieved from error_get_last().
+ * @return bool Whether WordPress should handle this error.
+ */
+ protected function should_handle_error( $error ) {
+ $error_types_to_handle = array(
+ E_ERROR,
+ E_PARSE,
+ E_USER_ERROR,
+ E_COMPILE_ERROR,
+ E_RECOVERABLE_ERROR,
+ );
+
+ if ( isset( $error['type'] ) && in_array( $error['type'], $error_types_to_handle, true ) ) {
+ return true;
+ }
+
+ /**
+ * Filters whether a given thrown error should be handled by the fatal error handler.
+ *
+ * This filter is only fired if the error is not already configured to be handled by WordPress core. As such,
+ * it exclusively allows adding further rules for which errors should be handled, but not removing existing
+ * ones.
+ *
+ * @since 5.2.0
+ *
+ * @param bool $should_handle_error Whether the error should be handled by the fatal error handler.
+ * @param array $error Error information retrieved from error_get_last().
+ */
+ return (bool) apply_filters( 'wp_should_handle_php_error', false, $error );
+ }
+
+ /**
+ * Displays the PHP error template and sends the HTTP status code, typically 500.
+ *
+ * A drop-in 'php-error.php' can be used as a custom template. This drop-in should control the HTTP status code and
+ * print the HTML markup indicating that a PHP error occurred. Note that this drop-in may potentially be executed
+ * very early in the WordPress bootstrap process, so any core functions used that are not part of
+ * `wp-includes/load.php` should be checked for before being called.
+ *
+ * If no such drop-in is available, this will call {@see WP_Fatal_Error_Handler::display_default_error_template()}.
+ *
+ * @since 5.2.0
+ *
+ * @param array $error Error information retrieved from `error_get_last()`.
+ */
+ protected function display_error_template( $error ) {
+ if ( defined( 'WP_CONTENT_DIR' ) ) {
+ // Load custom PHP error template, if present.
+ $php_error_pluggable = WP_CONTENT_DIR . '/php-error.php';
+ if ( is_readable( $php_error_pluggable ) ) {
+ require_once $php_error_pluggable;
+
+ return;
+ }
+ }
+
+ // Otherwise, display the default error template.
+ $this->display_default_error_template( $error );
+ }
+
+ /**
+ * Displays the default PHP error template.
+ *
+ * This method is called conditionally if no 'php-error.php' drop-in is available.
+ *
+ * It calls {@see wp_die()} with a message indicating that the site is experiencing technical difficulties and a
+ * login link to the admin backend. The {@see 'wp_php_error_message'} and {@see 'wp_php_error_args'} filters can
+ * be used to modify these parameters.
+ *
+ * @since 5.2.0
+ *
+ * @param array $error Error information retrieved from `error_get_last()`.
+ */
+ protected function display_default_error_template( $error ) {
+ if ( ! function_exists( '__' ) ) {
+ wp_load_translations_early();
+ }
+
+ if ( ! function_exists( 'wp_die' ) ) {
+ require_once ABSPATH . WPINC . '/functions.php';
+ }
+
+ if ( ! class_exists( 'WP_Error' ) ) {
+ require_once ABSPATH . WPINC . '/class-wp-error.php';
+ }
+
+ if ( is_protected_endpoint() ) {
+ $message = __( 'The site is experiencing technical difficulties. Please check your site admin email inbox for instructions.' );
+ } else {
+ $message = __( 'The site is experiencing technical difficulties.' );
+ }
+
+ $args = array(
+ 'response' => 500,
+ 'exit' => false,
+ );
+
+ /**
+ * Filters the message that the default PHP error template displays.
+ *
+ * @since 5.2.0
+ *
+ * @param string $message HTML error message to display.
+ * @param array $error Error information retrieved from `error_get_last()`.
+ */
+ $message = apply_filters( 'wp_php_error_message', $message, $error );
+
+ /**
+ * Filters the arguments passed to {@see wp_die()} for the default PHP error template.
+ *
+ * @since 5.2.0
+ *
+ * @param array $args Associative array of arguments passed to `wp_die()`. By default these contain a
+ * 'response' key, and optionally 'link_url' and 'link_text' keys.
+ * @param array $error Error information retrieved from `error_get_last()`.
+ */
+ $args = apply_filters( 'wp_php_error_args', $args, $error );
+
+ $wp_error = new WP_Error(
+ 'internal_server_error',
+ $message,
+ array(
+ 'error' => $error,
+ )
+ );
+
+ wp_die( $wp_error, '', $args );
+ }
+}