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<?php
/**
 * Class ErrorPage.
 *
 * @package AmpProject\AmpWP
 */

namespace AmpProject\AmpWP\DevTools;

use AmpProject\AmpWP\Infrastructure\Service;
use Error;
use Exception;
use InvalidArgumentException;
use Throwable;

/**
 * Produces an error page similar to wp_die().
 *
 * The actual wp_die() function cannot be used within the AMP response
 * preparation code, as its 'exit' argument is only usable from WP 5.1 onwards.
 *
 * @see wp_die()
 * @package AmpProject\AmpWP
 * @since   2.0.1
 * @internal
 */
final class ErrorPage implements Service {

/**
	 * Title of the error page.
	 *
	 * @var string
	 */
	private $title = '';

/**
	 * Message of the error page.
	 *
	 * @var string
	 */
	private $message = '';

/**
	 * Back link URL.
	 *
	 * @var string
	 */
	private $link_url = '';

/**
	 * Back link text.
	 *
	 * @var string
	 */
	private $link_text = '';

/**
	 * Throwable of the error page.
	 *
	 * @var Throwable
	 */
	private $throwable;

/**
	 * Response code of the error page.
	 *
	 * @var int
	 */
	private $response_code = 500;

/**
	 * Culprit detection to use.
	 *
	 * @var LikelyCulpritDetector
	 */
	private $likely_culprit_detector;

/**
	 * ErrorPage constructor.
	 *
	 * @param LikelyCulpritDetector $likely_culprit_detector Culprit detection
	 *                                                       to use.
	 */
	public function __construct( LikelyCulpritDetector $likely_culprit_detector ) {
		$this->likely_culprit_detector = $likely_culprit_detector;
	}

/**
	 * Set the title of the error page.
	 *
	 * @param string $title Title to use.
	 * @return self
	 */
	public function with_title( $title ) {
		$this->title = $title;
		return $this;
	}

/**
	 * Set the message of the error page.
	 *
	 * @param string $message Message to use.
	 * @return self
	 */
	public function with_message( $message ) {
		$this->message = $message;
		return $this;
	}

/**
	 * Set the message of the error page.
	 *
	 * @param string $link_url  Link URL.
	 * @param string $link_text Link text.
	 * @return self
	 */
	public function with_back_link( $link_url, $link_text ) {
		$this->link_url  = $link_url;
		$this->link_text = $link_text;
		return $this;
	}

/**
	 * Set the throwable of the error page.
	 *
	 * @param Throwable|Exception $throwable Exception or Error to use. The Throwable type does not exist in PHP 5,
	 *                                       which is why type is absent from the function parameter.
	 * @throws InvalidArgumentException If $throwable is not an Exception or an Error.
	 * @return self
	 */
	public function with_throwable( $throwable ) {
		if ( ! ( $throwable instanceof Exception || $throwable instanceof Error ) ) {
			throw new InvalidArgumentException( 'Parameter must be Throwable (Exception or Error).' );
		}
		$this->throwable = $throwable;
		return $this;
	}

/**
	 * Set the response_code of the error page.
	 *
	 * @param int $response_code Response code to use.
	 * @return self
	 */
	public function with_response_code( $response_code ) {
		$this->response_code = $response_code;
		return $this;
	}

/**
	 * Render the error page.
	 *
	 * This first sets the required headers and then returns the HTML to send as
	 * output.
	 *
	 * @return string
	 */
	public function render() {
		$this->send_to_error_log();

$this->set_headers();

$text_direction = function_exists( 'is_rtl' ) && is_rtl()
			? 'rtl'
			: 'ltr';

$styles = $this->get_styles( $text_direction );
		$html   = $this->get_html( $styles, $text_direction );

return $html;
	}

/**
	 * Send the throwable that was caught to the error log.
	 */
	private function send_to_error_log() {
		// Don't send to error log if fatal errors are not to be reported.
		$error_level = error_reporting(); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.prevent_path_disclosure_error_reporting,WordPress.PHP.DiscouragedPHPFunctions.runtime_configuration_error_reporting
		if ( ! (bool) ( $error_level & E_ERROR ) ) {
			return;
		}

if ( null !== $this->throwable ) {
			error_log( // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
				sprintf(
					"%s - %s (%s) [%s]\n%s",
					$this->message,
					$this->throwable->getMessage(),
					$this->throwable->getCode(),
					get_class( $this->throwable ),
					$this->throwable->getTraceAsString()
				)
			);
		}
	}

/**
	 * Sets the required headers.
	 *
	 * This will only adapt the headers if they haven't yet been sent.
	 */
	private function set_headers() {
		if ( ! headers_sent() ) {
			// Define the content type for the error page.
			header( 'Content-Type: text/html; charset=utf-8' );

// Mark the page as a server failure so it won't get indexed.
			status_header( $this->response_code );

// Let the browser know this result shouldn't get cached.
			nocache_headers();
		}
	}

/**
	 * Get the HTML output for the error page.
	 *
	 * @param string $styles         CSS styles to use.
	 * @param string $text_direction Text direction. Can be 'ltr' or 'rtl'.
	 * @return string HTML output.
	 */
	private function get_html( $styles, $text_direction ) {
		$no_robots = get_option( 'blog_public' )
			? "<meta name='robots' content='noindex,follow' />\n"
			: "<meta name='robots' content='noindex,nofollow' />\n";

return <<<HTML
<!DOCTYPE html>
<html dir="{$text_direction}">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
		<meta name="viewport" content="width=device-width">
		{$no_robots}
		<title>{$this->render_title()}</title>
		{$styles}
	</head>
	<body id="error-page">
		<h1>{$this->render_title()}</h1>
		{$this->render_message()}
		{$this->render_source()}
		{$this->render_support_link()}
		{$this->render_throwable()}
		{$this->render_back_link()}
	</body>
</html>
HTML;
	}

/**
	 * Render title.
	 *
	 * @return string HTML-escaped title.
	 */
	private function render_title() {
		return esc_html( $this->title );
	}

/**
	 * Render message.
	 *
	 * @return string KSES-sanitized message.
	 */
	private function render_message() {
		return '<p>' . wp_kses_post( $this->message ) . '</p>';
	}

/**
	 * Render support link.
	 *
	 * @return string
	 */
	private function render_support_link() {
		return '<p>' . wp_kses(
			sprintf(
				/* translators: %s is the AMP support forum URL. */
				__( 'If you get stuck, you may want to share any details in a new topic on the plugin\'s <a href="%s" target="_blank" rel="noreferrer noopener">support forum</a>.', 'amp' ),
				esc_url( __( 'https://wordpress.org/support/plugin/amp/', 'amp' ) )
			),
			[
				'a' => [
					'href'   => true,
					'target' => true,
					'rel'    => true,
				],
			]
		) . '</p>';
	}

/**
	 * Render the source of the throwable.
	 *
	 * @return string File source data.
	 */
	private function render_source() {
		if ( null === $this->throwable ) {
			return '';
		}

$source = $this->likely_culprit_detector->analyze_throwable( $this->throwable );

if ( ! empty( $source['type'] ) && ! empty( $source['name'] ) ) {
			$name_markup = "<strong><code>{$source['name']}</code></strong>";

switch ( $source['type'] ) {
				case 'plugin':
					/* translators: placeholder is the slug of the plugin */
					$message = sprintf( __( 'It appears the plugin with slug %s is responsible; please contact the author.', 'amp' ), $name_markup );
					break;
				case 'mu-plugin':
					/* translators: placeholder is the slug of the must-use plugin */
					$message = sprintf( __( 'It appears the must-use plugin with slug %s is responsible; please contact the author.', 'amp' ), $name_markup );
					break;
				case 'theme':
					/* translators: placeholder is the slug of the theme */
					$message = sprintf( __( 'It appears the theme with slug %s is responsible; please contact the author.', 'amp' ), $name_markup );
					break;
				default:
					return '';
			}

return wp_kses(
				"<p>{$message}</p>",
				array_fill_keys( [ 'p', 'strong', 'code' ], [] )
			);
		}

return '';
	}

/**
	 * Render the throwable of the error page.
	 *
	 * The exception/error details are only rendered if both WP_DEBUG and WP_DEBUG_DISPLAY are true.
	 *
	 * @return string HTML describing the exception/error that was thrown.
	 */
	private function render_throwable() {
		if ( null === $this->throwable ) {
			return '';
		}

if (
			! defined( 'WP_DEBUG' )
			|| ! WP_DEBUG
			|| ! defined( 'WP_DEBUG_DISPLAY' )
			|| ! WP_DEBUG_DISPLAY
		) {
			return wpautop(
				wp_kses_post(
					__( 'The exact details of the error are hidden for security reasons. To learn more about this error, enable the WordPress debugging display (by setting both <code>WP_DEBUG</code> and <code>WP_DEBUG_DISPLAY</code> to <code>true</code>), or look into the PHP error log. Learn more about <a href="https://wordpress.org/support/article/debugging-in-wordpress/">Debugging in WordPress</a>.', 'amp' )
				)
			);
		}

$contents = implode(
			"\n",
			[
				sprintf(
					'<strong>%s</strong> (%s) [<em>%s</em>]',
					esc_html( $this->throwable->getMessage() ),
					esc_html( $this->throwable->getCode() ),
					esc_html( get_class( $this->throwable ) )
				),
				sprintf(
					'<em>%s:%d</em>',
					esc_html( $this->throwable->getFile() ),
					esc_html( $this->throwable->getLine() )
				),
				'',
				sprintf(
					'<small>%s</small>',
					esc_html( $this->throwable->getTraceAsString() )
				),
			]
		);

return "<hr><pre class='throwable'>{$contents}</pre>";
	}

/**
	 * Render back link.
	 *
	 * @return string Back link.
	 */
	private function render_back_link() {
		if ( empty( $this->link_text ) || empty( $this->link_url ) ) {
			return '';
		}
		return sprintf(
			'<p><a href="%s" class="button button-large">%s</a></p>',
			esc_url( $this->link_url ),
			esc_html( $this->link_text )
		);
	}

/**
	 * Get the CSS styles to use for the error page.
	 *
	 * @see _default_wp_die_handler() Where styles are adapted from.
	 *
	 * @param string $text_direction Text direction. Can be 'ltr' or 'rtl'.
	 * @return string CSS styles to use.
	 */
	private function get_styles( $text_direction ) {
		$rtl_font_tweak = 'rtl' === $text_direction
			? 'body { font-family: Tahoma, Arial; }'
			: '';

return <<<STYLES
<style type="text/css">
	html {
		background: #f1f1f1;
	}
	body {
		background: #fff;
		color: #444;
		font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
		margin: 2em auto;
		padding: 1em 2em;
		max-width: 700px;
		-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.13);
		box-shadow: 0 1px 3px rgba(0, 0, 0, 0.13);
	}
	h1 {
		border-bottom: 1px solid #dadada;
		clear: both;
		color: #666;
		font-size: 24px;
		margin: 30px 0 0 0;
		padding: 0;
		padding-bottom: 7px;
	}
	hr {
		margin: 20px 0;
		border: none;
		border-top: 1px solid #dadada;
	}
	#error-page {
		margin-top: 50px;
	}
	#error-page p,
	#error-page .wp-die-message {
		font-size: 14px;
		line-height: 1.5;
		margin: 25px 0 20px;
	}
	#error-page .throwable,
	code {
		font-family: Consolas, Monaco, monospace;
		overflow-x: auto;
	}
	ul li {
		margin-bottom: 10px;
		font-size: 14px ;
	}
	a {
		color: #0073aa;
	}
	a:hover,
	a:active {
		color: #006799;
	}
	a:focus {
		color: #124964;
		-webkit-box-shadow:
			0 0 0 1px #5b9dd9,
			0 0 2px 1px rgba(30, 140, 190, 0.8);
		box-shadow:
			0 0 0 1px #5b9dd9,
			0 0 2px 1px rgba(30, 140, 190, 0.8);
		outline: none;
	}
	.button {
		background: #f7f7f7;
		border: 1px solid #ccc;
		color: #555;
		display: inline-block;
		text-decoration: none;
		font-size: 13px;
		line-height: 2;
		height: 28px;
		margin: 0;
		padding: 0 10px 1px;
		cursor: pointer;
		-webkit-border-radius: 3px;
		-webkit-appearance: none;
		border-radius: 3px;
		white-space: nowrap;
		-webkit-box-sizing: border-box;
		-moz-box-sizing:    border-box;
		box-sizing:         border-box;

-webkit-box-shadow: 0 1px 0 #ccc;
		box-shadow: 0 1px 0 #ccc;
		vertical-align: top;
	}

.button.button-large {
		height: 30px;
		line-height: 2.15384615;
		padding: 0 12px 2px;
	}

.button:hover,
	.button:focus {
		background: #fafafa;
		border-color: #999;
		color: #23282d;
	}

.button:focus {
		border-color: #5b9dd9;
		-webkit-box-shadow: 0 0 3px rgba(0, 115, 170, 0.8);
		box-shadow: 0 0 3px rgba(0, 115, 170, 0.8);
		outline: none;
	}

.button:active {
		background: #eee;
		border-color: #999;
		-webkit-box-shadow: inset 0 2px 5px -3px rgba(0, 0, 0, 0.5);
		box-shadow: inset 0 2px 5px -3px rgba(0, 0, 0, 0.5);
	}

{$rtl_font_tweak}
</style>
STYLES;
	}
}

Editing: ErrorPage.php

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