Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/wp-includes/class-wp-fatal-error-handler.php b/wp-includes/class-wp-fatal-error-handler.php
new file mode 100644
index 0000000..842182d
--- /dev/null
+++ b/wp-includes/class-wp-fatal-error-handler.php
@@ -0,0 +1,241 @@
+<?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
+ */
+#[AllowDynamicProperties]
+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;
+		}
+
+		// Do not trigger the fatal error handler while updates are being installed.
+		if ( wp_is_maintenance_mode() ) {
+			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();
+			}
+
+			$handled = false;
+
+			if ( ! is_multisite() && wp_recovery_mode()->is_initialized() ) {
+				$handled = 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, $handled );
+			}
+		} 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 information returned by `error_get_last()`, or null
+	 *                    if none was recorded or 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, $error );
+	}
+
+	/**
+	 * Displays the PHP error template and sends the HTTP status code, typically 500.
+	 *
+	 * A drop-in 'php-error.php' can be used as a custom template. This drop-in should control the HTTP status code and
+	 * print the HTML markup indicating that a PHP error occurred. Note that this drop-in may potentially be executed
+	 * very early in the WordPress bootstrap process, so any core functions used that are not part of
+	 * `wp-includes/load.php` should be checked for before being called.
+	 *
+	 * If no such drop-in is available, this will call {@see WP_Fatal_Error_Handler::display_default_error_template()}.
+	 *
+	 * @since 5.2.0
+	 * @since 5.3.0 The `$handled` parameter was added.
+	 *
+	 * @param array         $error   Error information retrieved from `error_get_last()`.
+	 * @param true|WP_Error $handled Whether Recovery Mode handled the fatal error.
+	 */
+	protected function display_error_template( $error, $handled ) {
+		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, $handled );
+	}
+
+	/**
+	 * Displays the default PHP error template.
+	 *
+	 * This method is called conditionally if no 'php-error.php' drop-in is available.
+	 *
+	 * It calls {@see wp_die()} with a message indicating that the site is experiencing technical difficulties and a
+	 * login link to the admin backend. The {@see 'wp_php_error_message'} and {@see 'wp_php_error_args'} filters can
+	 * be used to modify these parameters.
+	 *
+	 * @since 5.2.0
+	 * @since 5.3.0 The `$handled` parameter was added.
+	 *
+	 * @param array         $error   Error information retrieved from `error_get_last()`.
+	 * @param true|WP_Error $handled Whether Recovery Mode handled the fatal error.
+	 */
+	protected function display_default_error_template( $error, $handled ) {
+		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 ( true === $handled && wp_is_recovery_mode() ) {
+			$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.' );
+		} elseif ( is_protected_endpoint() && wp_recovery_mode()->is_initialized() ) {
+			if ( is_multisite() ) {
+				$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.' );
+			} else {
+				$message = __( 'There has been a critical error on this website. Please check your site admin email inbox for instructions.' );
+			}
+		} else {
+			$message = __( 'There has been a critical error on this website.' );
+		}
+
+		$message = sprintf(
+			'<p>%s</p><p><a href="%s">%s</a></p>',
+			$message,
+			/* translators: Documentation about troubleshooting. */
+			__( 'https://wordpress.org/documentation/article/faq-troubleshooting/' ),
+			__( 'Learn more about troubleshooting WordPress.' )
+		);
+
+		$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 );
+	}
+}