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Editing: class-wp-recovery-mode-email-service.php

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<?php
/**
 * Error Protection API: WP_Recovery_Mode_Email_Link class
 *
 * @package WordPress
 * @since 5.2.0
 */

/**
 * Core class used to send an email with a link to begin Recovery Mode.
 *
 * @since 5.2.0
 */
#[AllowDynamicProperties]
final class WP_Recovery_Mode_Email_Service {

const RATE_LIMIT_OPTION = 'recovery_mode_email_last_sent';

/**
	 * Service to generate recovery mode URLs.
	 *
	 * @since 5.2.0
	 * @var WP_Recovery_Mode_Link_Service
	 */
	private $link_service;

/**
	 * WP_Recovery_Mode_Email_Service constructor.
	 *
	 * @since 5.2.0
	 *
	 * @param WP_Recovery_Mode_Link_Service $link_service
	 */
	public function __construct( WP_Recovery_Mode_Link_Service $link_service ) {
		$this->link_service = $link_service;
	}

/**
	 * Sends the recovery mode email if the rate limit has not been sent.
	 *
	 * @since 5.2.0
	 *
	 * @param int   $rate_limit Number of seconds before another email can be sent.
	 * @param array $error      Error details from `error_get_last()`.
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The plugin or theme's directory.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return true|WP_Error True if email sent, WP_Error otherwise.
	 */
	public function maybe_send_recovery_mode_email( $rate_limit, $error, $extension ) {

$last_sent = get_option( self::RATE_LIMIT_OPTION );

if ( ! $last_sent || time() > $last_sent + $rate_limit ) {
			if ( ! update_option( self::RATE_LIMIT_OPTION, time() ) ) {
				return new WP_Error( 'storage_error', __( 'Could not update the email last sent time.' ) );
			}

$sent = $this->send_recovery_mode_email( $rate_limit, $error, $extension );

if ( $sent ) {
				return true;
			}

return new WP_Error(
				'email_failed',
				sprintf(
					/* translators: %s: mail() */
					__( 'The email could not be sent. Possible reason: your host may have disabled the %s function.' ),
					'mail()'
				)
			);
		}

$err_message = sprintf(
			/* translators: 1: Last sent as a human time diff, 2: Wait time as a human time diff. */
			__( 'A recovery link was already sent %1$s ago. Please wait another %2$s before requesting a new email.' ),
			human_time_diff( $last_sent ),
			human_time_diff( $last_sent + $rate_limit )
		);

return new WP_Error( 'email_sent_already', $err_message );
	}

/**
	 * Clears the rate limit, allowing a new recovery mode email to be sent immediately.
	 *
	 * @since 5.2.0
	 *
	 * @return bool True on success, false on failure.
	 */
	public function clear_rate_limit() {
		return delete_option( self::RATE_LIMIT_OPTION );
	}

/**
	 * Sends the Recovery Mode email to the site admin email address.
	 *
	 * @since 5.2.0
	 *
	 * @param int   $rate_limit Number of seconds before another email can be sent.
	 * @param array $error      Error details from `error_get_last()`.
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return bool Whether the email was sent successfully.
	 */
	private function send_recovery_mode_email( $rate_limit, $error, $extension ) {

$url      = $this->link_service->generate_url();
		$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

$switched_locale = switch_to_locale( get_locale() );

if ( $extension ) {
			$cause   = $this->get_cause( $extension );
			$details = wp_strip_all_tags( wp_get_extension_error_description( $error ) );

if ( $details ) {
				$header  = __( 'Error Details' );
				$details = "\n\n" . $header . "\n" . str_pad( '', strlen( $header ), '=' ) . "\n" . $details;
			}
		} else {
			$cause   = '';
			$details = '';
		}

/**
		 * Filters the support message sent with the fatal error protection email.
		 *
		 * @since 5.2.0
		 *
		 * @param string $message The Message to include in the email.
		 */
		$support = apply_filters( 'recovery_email_support_info', __( 'Please contact your host for assistance with investigating this issue further.' ) );

/**
		 * Filters the debug information included in the fatal error protection email.
		 *
		 * @since 5.3.0
		 *
		 * @param array $message An associative array of debug information.
		 */
		$debug = apply_filters( 'recovery_email_debug_info', $this->get_debug( $extension ) );

/* translators: Do not translate LINK, EXPIRES, CAUSE, DETAILS, SITEURL, PAGEURL, SUPPORT. DEBUG: those are placeholders. */
		$message = __(
			'Howdy!

WordPress has a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
###CAUSE###
First, visit your website (###SITEURL###) and check for any visible issues. Next, visit the page where the error was caught (###PAGEURL###) and check for any visible issues.

###SUPPORT###

If your site appears broken and you can\'t access your dashboard normally, WordPress now has a special "recovery mode". This lets you safely login to your dashboard and investigate further.

###LINK###

To keep your site safe, this link will expire in ###EXPIRES###. Don\'t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

When seeking help with this issue, you may be asked for some of the following information:
###DEBUG###

###DETAILS###'
		);
		$message = str_replace(
			array(
				'###LINK###',
				'###EXPIRES###',
				'###CAUSE###',
				'###DETAILS###',
				'###SITEURL###',
				'###PAGEURL###',
				'###SUPPORT###',
				'###DEBUG###',
			),
			array(
				$url,
				human_time_diff( time() + $rate_limit ),
				$cause ? "\n{$cause}\n" : "\n",
				$details,
				home_url( '/' ),
				home_url( $_SERVER['REQUEST_URI'] ),
				$support,
				implode( "\r\n", $debug ),
			),
			$message
		);

$email = array(
			'to'          => $this->get_recovery_mode_email_address(),
			/* translators: %s: Site title. */
			'subject'     => __( '[%s] Your Site is Experiencing a Technical Issue' ),
			'message'     => $message,
			'headers'     => '',
			'attachments' => '',
		);

/**
		 * Filters the contents of the Recovery Mode email.
		 *
		 * @since 5.2.0
		 * @since 5.6.0 The `$email` argument includes the `attachments` key.
		 *
		 * @param array  $email {
		 *     Used to build a call to wp_mail().
		 *
		 *     @type string|array $to          Array or comma-separated list of email addresses to send message.
		 *     @type string       $subject     Email subject
		 *     @type string       $message     Message contents
		 *     @type string|array $headers     Optional. Additional headers.
		 *     @type string|array $attachments Optional. Files to attach.
		 * }
		 * @param string $url   URL to enter recovery mode.
		 */
		$email = apply_filters( 'recovery_mode_email', $email, $url );

$sent = wp_mail(
			$email['to'],
			wp_specialchars_decode( sprintf( $email['subject'], $blogname ) ),
			$email['message'],
			$email['headers'],
			$email['attachments']
		);

if ( $switched_locale ) {
			restore_previous_locale();
		}

return $sent;
	}

/**
	 * Gets the email address to send the recovery mode link to.
	 *
	 * @since 5.2.0
	 *
	 * @return string Email address to send recovery mode link to.
	 */
	private function get_recovery_mode_email_address() {
		if ( defined( 'RECOVERY_MODE_EMAIL' ) && is_email( RECOVERY_MODE_EMAIL ) ) {
			return RECOVERY_MODE_EMAIL;
		}

return get_option( 'admin_email' );
	}

/**
	 * Gets the description indicating the possible cause for the error.
	 *
	 * @since 5.2.0
	 *
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return string Message about which extension caused the error.
	 */
	private function get_cause( $extension ) {

if ( 'plugin' === $extension['type'] ) {
			$plugin = $this->get_plugin( $extension );

if ( false === $plugin ) {
				$name = $extension['slug'];
			} else {
				$name = $plugin['Name'];
			}

/* translators: %s: Plugin name. */
			$cause = sprintf( __( 'In this case, WordPress caught an error with one of your plugins, %s.' ), $name );
		} else {
			$theme = wp_get_theme( $extension['slug'] );
			$name  = $theme->exists() ? $theme->display( 'Name' ) : $extension['slug'];

/* translators: %s: Theme name. */
			$cause = sprintf( __( 'In this case, WordPress caught an error with your theme, %s.' ), $name );
		}

return $cause;
	}

/**
	 * Return the details for a single plugin based on the extension data from an error.
	 *
	 * @since 5.3.0
	 *
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return array|false A plugin array {@see get_plugins()} or `false` if no plugin was found.
	 */
	private function get_plugin( $extension ) {
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

$plugins = get_plugins();

// Assume plugin main file name first since it is a common convention.
		if ( isset( $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ] ) ) {
			return $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ];
		} else {
			foreach ( $plugins as $file => $plugin_data ) {
				if ( str_starts_with( $file, "{$extension['slug']}/" ) || $file === $extension['slug'] ) {
					return $plugin_data;
				}
			}
		}

return false;
	}

/**
	 * Return debug information in an easy to manipulate format.
	 *
	 * @since 5.3.0
	 *
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return array An associative array of debug information.
	 */
	private function get_debug( $extension ) {
		$theme      = wp_get_theme();
		$wp_version = get_bloginfo( 'version' );

$debug = array(
			'wp'    => sprintf(
				/* translators: %s: Current WordPress version number. */
				__( 'WordPress version %s' ),
				$wp_version
			),
			'theme' => sprintf(
				/* translators: 1: Current active theme name. 2: Current active theme version. */
				__( 'Active theme: %1$s (version %2$s)' ),
				$theme->get( 'Name' ),
				$theme->get( 'Version' )
			),
		);

if ( $extension ) {
			$plugin = $this->get_plugin( $extension );

if ( is_array( $plugin ) ) {
				$debug['plugin'] = sprintf(
					/* translators: 1: The failing plugin's name. 2: The failing plugin's version. */
					__( 'Current plugin: %1$s (version %2$s)' ),
					$plugin['Name'],
					$plugin['Version']
				);
			}
		}

$debug['php'] = sprintf(
			/* translators: %s: The currently used PHP version. */
			__( 'PHP version %s' ),
			PHP_VERSION
		);

return $debug;
	}
}

Editing: class-wp-recovery-mode-email-service.php

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