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   1  <?php
   2  /**
   3   * Error Protection API: WP_Recovery_Mode_Email_Link class
   4   *
   5   * @package WordPress
   6   * @since 5.2.0
   7   */
   8  
   9  /**
  10   * Core class used to send an email with a link to begin Recovery Mode.
  11   *
  12   * @since 5.2.0
  13   */
  14  final class WP_Recovery_Mode_Email_Service {
  15  
  16      const RATE_LIMIT_OPTION = 'recovery_mode_email_last_sent';
  17  
  18      /**
  19       * Service to generate recovery mode URLs.
  20       *
  21       * @since 5.2.0
  22       * @var WP_Recovery_Mode_Link_Service
  23       */
  24      private $link_service;
  25  
  26      /**
  27       * WP_Recovery_Mode_Email_Service constructor.
  28       *
  29       * @since 5.2.0
  30       *
  31       * @param WP_Recovery_Mode_Link_Service $link_service
  32       */
  33  	public function __construct( WP_Recovery_Mode_Link_Service $link_service ) {
  34          $this->link_service = $link_service;
  35      }
  36  
  37      /**
  38       * Sends the recovery mode email if the rate limit has not been sent.
  39       *
  40       * @since 5.2.0
  41       *
  42       * @param int   $rate_limit Number of seconds before another email can be sent.
  43       * @param array $error      Error details from {@see error_get_last()}
  44       * @param array $extension {
  45       *     The extension that caused the error.
  46       *
  47       *     @type string $slug The extension slug. The plugin or theme's directory.
  48       *     @type string $type The extension type. Either 'plugin' or 'theme'.
  49       * }
  50       * @return true|WP_Error True if email sent, WP_Error otherwise.
  51       */
  52  	public function maybe_send_recovery_mode_email( $rate_limit, $error, $extension ) {
  53  
  54          $last_sent = get_option( self::RATE_LIMIT_OPTION );
  55  
  56          if ( ! $last_sent || time() > $last_sent + $rate_limit ) {
  57              if ( ! update_option( self::RATE_LIMIT_OPTION, time() ) ) {
  58                  return new WP_Error( 'storage_error', __( 'Could not update the email last sent time.' ) );
  59              }
  60  
  61              $sent = $this->send_recovery_mode_email( $rate_limit, $error, $extension );
  62  
  63              if ( $sent ) {
  64                  return true;
  65              }
  66  
  67              return new WP_Error(
  68                  'email_failed',
  69                  sprintf(
  70                      /* translators: %s: mail() */
  71                      __( 'The email could not be sent. Possible reason: your host may have disabled the %s function.' ),
  72                      'mail()'
  73                  )
  74              );
  75          }
  76  
  77          $err_message = sprintf(
  78              /* translators: 1: Last sent as a human time diff, 2: Wait time as a human time diff. */
  79              __( 'A recovery link was already sent %1$s ago. Please wait another %2$s before requesting a new email.' ),
  80              human_time_diff( $last_sent ),
  81              human_time_diff( $last_sent + $rate_limit )
  82          );
  83  
  84          return new WP_Error( 'email_sent_already', $err_message );
  85      }
  86  
  87      /**
  88       * Clears the rate limit, allowing a new recovery mode email to be sent immediately.
  89       *
  90       * @since 5.2.0
  91       *
  92       * @return bool True on success, false on failure.
  93       */
  94  	public function clear_rate_limit() {
  95          return delete_option( self::RATE_LIMIT_OPTION );
  96      }
  97  
  98      /**
  99       * Sends the Recovery Mode email to the site admin email address.
 100       *
 101       * @since 5.2.0
 102       *
 103       * @param int   $rate_limit Number of seconds before another email can be sent.
 104       * @param array $error      Error details from {@see error_get_last()}
 105       * @param array $extension  Extension that caused the error.
 106       * @return bool Whether the email was sent successfully.
 107       */
 108  	private function send_recovery_mode_email( $rate_limit, $error, $extension ) {
 109  
 110          $url      = $this->link_service->generate_url();
 111          $blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 112  
 113          $switched_locale = false;
 114  
 115          // The switch_to_locale() function is loaded before it can actually be used.
 116          if ( function_exists( 'switch_to_locale' ) && isset( $GLOBALS['wp_locale_switcher'] ) ) {
 117              $switched_locale = switch_to_locale( get_locale() );
 118          }
 119  
 120          if ( $extension ) {
 121              $cause   = $this->get_cause( $extension );
 122              $details = wp_strip_all_tags( wp_get_extension_error_description( $error ) );
 123  
 124              if ( $details ) {
 125                  $header  = __( 'Error Details' );
 126                  $details = "\n\n" . $header . "\n" . str_pad( '', strlen( $header ), '=' ) . "\n" . $details;
 127              }
 128          } else {
 129              $cause   = '';
 130              $details = '';
 131          }
 132  
 133          /**
 134           * Filters the support message sent with the the fatal error protection email.
 135           *
 136           * @since 5.2.0
 137           *
 138           * @param string $message The Message to include in the email.
 139           */
 140          $support = apply_filters( 'recovery_email_support_info', __( 'Please contact your host for assistance with investigating this issue further.' ) );
 141  
 142          /**
 143           * Filters the debug information included in the fatal error protection email.
 144           *
 145           * @since 5.3.0
 146           *
 147           * @param array $message An associative array of debug information.
 148           */
 149          $debug = apply_filters( 'recovery_email_debug_info', $this->get_debug( $extension ) );
 150  
 151          /* translators: Do not translate LINK, EXPIRES, CAUSE, DETAILS, SITEURL, PAGEURL, SUPPORT. DEBUG: those are placeholders. */
 152          $message = __(
 153              'Howdy!
 154  
 155  Since WordPress 5.2 there is 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.
 156  ###CAUSE###
 157  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.
 158  
 159  ###SUPPORT###
 160  
 161  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.
 162  
 163  ###LINK###
 164  
 165  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.
 166  
 167  When seeking help with this issue, you may be asked for some of the following information:
 168  ###DEBUG###
 169  
 170  ###DETAILS###'
 171          );
 172          $message = str_replace(
 173              array(
 174                  '###LINK###',
 175                  '###EXPIRES###',
 176                  '###CAUSE###',
 177                  '###DETAILS###',
 178                  '###SITEURL###',
 179                  '###PAGEURL###',
 180                  '###SUPPORT###',
 181                  '###DEBUG###',
 182              ),
 183              array(
 184                  $url,
 185                  human_time_diff( time() + $rate_limit ),
 186                  $cause ? "\n{$cause}\n" : "\n",
 187                  $details,
 188                  home_url( '/' ),
 189                  home_url( $_SERVER['REQUEST_URI'] ),
 190                  $support,
 191                  implode( "\r\n", $debug ),
 192              ),
 193              $message
 194          );
 195  
 196          $email = array(
 197              'to'          => $this->get_recovery_mode_email_address(),
 198              /* translators: %s: Site title. */
 199              'subject'     => __( '[%s] Your Site is Experiencing a Technical Issue' ),
 200              'message'     => $message,
 201              'headers'     => '',
 202              'attachments' => '',
 203          );
 204  
 205          /**
 206           * Filters the contents of the Recovery Mode email.
 207           *
 208           * @since 5.2.0
 209           * @since 5.6.0 The `$email` argument includes the `attachments` key.
 210           *
 211           * @param array  $email {
 212           *     Used to build a call to wp_mail().
 213           *
 214           *     @type string|array $to          Array or comma-separated list of email addresses to send message.
 215           *     @type string       $subject     Email subject
 216           *     @type string       $message     Message contents
 217           *     @type string|array $headers     Optional. Additional headers.
 218           *     @type string|array $attachments Optional. Files to attach.
 219           * }
 220           * @param string $url   URL to enter recovery mode.
 221           */
 222          $email = apply_filters( 'recovery_mode_email', $email, $url );
 223  
 224          $sent = wp_mail(
 225              $email['to'],
 226              wp_specialchars_decode( sprintf( $email['subject'], $blogname ) ),
 227              $email['message'],
 228              $email['headers'],
 229              $email['attachments']
 230          );
 231  
 232          if ( $switched_locale ) {
 233              restore_previous_locale();
 234          }
 235  
 236          return $sent;
 237      }
 238  
 239      /**
 240       * Gets the email address to send the recovery mode link to.
 241       *
 242       * @since 5.2.0
 243       *
 244       * @return string Email address to send recovery mode link to.
 245       */
 246  	private function get_recovery_mode_email_address() {
 247          if ( defined( 'RECOVERY_MODE_EMAIL' ) && is_email( RECOVERY_MODE_EMAIL ) ) {
 248              return RECOVERY_MODE_EMAIL;
 249          }
 250  
 251          return get_option( 'admin_email' );
 252      }
 253  
 254      /**
 255       * Gets the description indicating the possible cause for the error.
 256       *
 257       * @since 5.2.0
 258       *
 259       * @param array $extension The extension that caused the error.
 260       * @return string Message about which extension caused the error.
 261       */
 262  	private function get_cause( $extension ) {
 263  
 264          if ( 'plugin' === $extension['type'] ) {
 265              $plugin = $this->get_plugin( $extension );
 266  
 267              if ( false === $plugin ) {
 268                  $name = $extension['slug'];
 269              } else {
 270                  $name = $plugin['Name'];
 271              }
 272  
 273              /* translators: %s: Plugin name. */
 274              $cause = sprintf( __( 'In this case, WordPress caught an error with one of your plugins, %s.' ), $name );
 275          } else {
 276              $theme = wp_get_theme( $extension['slug'] );
 277              $name  = $theme->exists() ? $theme->display( 'Name' ) : $extension['slug'];
 278  
 279              /* translators: %s: Theme name. */
 280              $cause = sprintf( __( 'In this case, WordPress caught an error with your theme, %s.' ), $name );
 281          }
 282  
 283          return $cause;
 284      }
 285  
 286      /**
 287       * Return the details for a single plugin based on the extension data from an error.
 288       *
 289       * @since 5.3.0
 290       *
 291       * @param array $extension The extension that caused the error.
 292       * @return array|false A plugin array {@see get_plugins()} or `false` if no plugin was found.
 293       */
 294  	private function get_plugin( $extension ) {
 295          if ( ! function_exists( 'get_plugins' ) ) {
 296              require_once ABSPATH . 'wp-admin/includes/plugin.php';
 297          }
 298  
 299          $plugins = get_plugins();
 300  
 301          // Assume plugin main file name first since it is a common convention.
 302          if ( isset( $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ] ) ) {
 303              return $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ];
 304          } else {
 305              foreach ( $plugins as $file => $plugin_data ) {
 306                  if ( 0 === strpos( $file, "{$extension['slug']}/" ) || $file === $extension['slug'] ) {
 307                      return $plugin_data;
 308                  }
 309              }
 310          }
 311  
 312          return false;
 313      }
 314  
 315      /**
 316       * Return debug information in an easy to manipulate format.
 317       *
 318       * @since 5.3.0
 319       *
 320       * @param array $extension The extension that caused the error.
 321       * @return array An associative array of debug information.
 322       */
 323  	private function get_debug( $extension ) {
 324          $theme      = wp_get_theme();
 325          $wp_version = get_bloginfo( 'version' );
 326  
 327          if ( $extension ) {
 328              $plugin = $this->get_plugin( $extension );
 329          } else {
 330              $plugin = null;
 331          }
 332  
 333          $debug = array(
 334              /* translators: %s: Current WordPress version number. */
 335              'wp'    => sprintf(
 336                  __( 'WordPress version %s' ),
 337                  $wp_version
 338              ),
 339              'theme' => sprintf(
 340                  /* translators: 1: Current active theme name. 2: Current active theme version. */
 341                  __( 'Current theme: %1$s (version %2$s)' ),
 342                  $theme->get( 'Name' ),
 343                  $theme->get( 'Version' )
 344              ),
 345          );
 346  
 347          if ( null !== $plugin ) {
 348              $debug['plugin'] = sprintf(
 349                  /* translators: 1: The failing plugins name. 2: The failing plugins version. */
 350                  __( 'Current plugin: %1$s (version %2$s)' ),
 351                  $plugin['Name'],
 352                  $plugin['Version']
 353              );
 354          }
 355  
 356          $debug['php'] = sprintf(
 357              /* translators: %s: The currently used PHP version. */
 358              __( 'PHP version %s' ),
 359              PHP_VERSION
 360          );
 361  
 362          return $debug;
 363      }
 364  }