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| 1 | <?php |
| 2 | /** |
| 3 | * Background check that keeps watching the domain's records after the user leaves. |
| 4 | * |
| 5 | * @package automattic/jetpack-send |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Send; |
| 9 | |
| 10 | if ( ! defined( 'ABSPATH' ) ) { |
| 11 | exit( 0 ); |
| 12 | } |
| 13 | |
| 14 | /** |
| 15 | * Cron watch: checks the records on a backing-off schedule for up to 7 days, turns sending on |
| 16 | * when they pass and sends one automatic test. |
| 17 | */ |
| 18 | class Dns_Watch { |
| 19 | |
| 20 | /** |
| 21 | * Cron hook. |
| 22 | * |
| 23 | * @var string |
| 24 | */ |
| 25 | const HOOK = 'jetpack_send_dns_watch'; |
| 26 | |
| 27 | /** |
| 28 | * Option holding the watch's progress: `{started_at, runs, stalled_notified_at}` (Unix times). |
| 29 | * |
| 30 | * @var string |
| 31 | */ |
| 32 | const OPTION = 'jetpack_send_dns_watch'; |
| 33 | |
| 34 | /** |
| 35 | * How long the watch runs before it gives up, in seconds. |
| 36 | * |
| 37 | * @var int |
| 38 | */ |
| 39 | const MAX_AGE = 7 * DAY_IN_SECONDS; |
| 40 | |
| 41 | /** |
| 42 | * How long the records can stay unverified before the one reminder email goes out. |
| 43 | * |
| 44 | * @var int |
| 45 | */ |
| 46 | const STALL_AFTER = 2 * DAY_IN_SECONDS; |
| 47 | |
| 48 | /** |
| 49 | * Without every record found locally, ask the mail service only on every Nth run. |
| 50 | * |
| 51 | * @var int |
| 52 | */ |
| 53 | const SERVICE_CHECK_EVERY = 5; |
| 54 | |
| 55 | /** |
| 56 | * Option used as a lock so overlapping cron runs can't send two tests. |
| 57 | * |
| 58 | * @var string |
| 59 | */ |
| 60 | const LOCK_OPTION = 'jetpack_send_dns_watch_lock'; |
| 61 | |
| 62 | /** |
| 63 | * Seconds after which a lock left by a crashed run is ignored. |
| 64 | * |
| 65 | * @var int |
| 66 | */ |
| 67 | const LOCK_TTL = 10 * MINUTE_IN_SECONDS; |
| 68 | |
| 69 | /** |
| 70 | * Hook the cron callback. |
| 71 | * |
| 72 | * @return void |
| 73 | */ |
| 74 | public static function init() { |
| 75 | add_action( self::HOOK, array( __CLASS__, 'run' ) ); |
| 76 | add_action( 'admin_init', array( __CLASS__, 'ensure_scheduled' ) ); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Start (or restart) watching the stored account's domain. Called after setup. |
| 81 | * |
| 82 | * @return void |
| 83 | */ |
| 84 | public static function start() { |
| 85 | self::unschedule(); |
| 86 | update_option( |
| 87 | self::OPTION, |
| 88 | array( |
| 89 | 'started_at' => time(), |
| 90 | 'runs' => 0, |
| 91 | 'stalled_notified_at' => null, |
| 92 | ), |
| 93 | false |
| 94 | ); |
| 95 | wp_schedule_single_event( time() + (int) self::next_delay( 0 ), self::HOOK ); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Stop watching and clear the schedule. Called on reset, uninstall and once sending is on. |
| 100 | * |
| 101 | * @return void |
| 102 | */ |
| 103 | public static function stop() { |
| 104 | self::unschedule(); |
| 105 | delete_option( self::OPTION ); |
| 106 | delete_option( self::LOCK_OPTION ); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Clear the scheduled run but keep the progress, so the watch can pick up again (plugin deactivation). |
| 111 | * |
| 112 | * @return void |
| 113 | */ |
| 114 | public static function unschedule() { |
| 115 | wp_clear_scheduled_hook( self::HOOK ); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Put a lost or paused schedule back while the watch is still running. |
| 120 | * |
| 121 | * @return void |
| 122 | */ |
| 123 | public static function ensure_scheduled() { |
| 124 | $watch = self::progress(); |
| 125 | if ( ! $watch || wp_next_scheduled( self::HOOK ) ) { |
| 126 | return; |
| 127 | } |
| 128 | $delay = self::next_delay( time() - $watch['started_at'] ); |
| 129 | if ( null === $delay ) { |
| 130 | self::stop(); |
| 131 | return; |
| 132 | } |
| 133 | wp_schedule_single_event( time() + $delay, self::HOOK ); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * One cron run: local lookup first, the mail-service check only when every record is found |
| 138 | * or every 5th run; on pass, Onboarding::maybe_auto_enable() and the automatic test. |
| 139 | * |
| 140 | * @return void |
| 141 | */ |
| 142 | public static function run() { |
| 143 | $watch = self::progress(); |
| 144 | $account = Account::get(); |
| 145 | if ( ! $watch || ! $account ) { |
| 146 | self::stop(); |
| 147 | return; |
| 148 | } |
| 149 | if ( ! self::lock() ) { |
| 150 | return; |
| 151 | } |
| 152 | |
| 153 | try { |
| 154 | ++$watch['runs']; |
| 155 | update_option( self::OPTION, $watch, false ); |
| 156 | |
| 157 | $elapsed = time() - $watch['started_at']; |
| 158 | if ( self::passes( $account ) ) { |
| 159 | self::note_run( $watch['runs'], 'passed', $elapsed ); |
| 160 | self::finish(); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | $lookup = Dns_Lookup::check( $account ); |
| 165 | if ( ! empty( $lookup['all_found'] ) || 0 === $watch['runs'] % self::SERVICE_CHECK_EVERY ) { |
| 166 | $account = self::check_with_mail_service( $account ); |
| 167 | if ( self::passes( $account ) ) { |
| 168 | self::note_run( $watch['runs'], 'passed', $elapsed ); |
| 169 | self::finish(); |
| 170 | return; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | if ( $elapsed >= self::STALL_AFTER && empty( $watch['stalled_notified_at'] ) ) { |
| 175 | $watch['stalled_notified_at'] = time(); |
| 176 | update_option( self::OPTION, $watch, false ); |
| 177 | self::send_stall_email( $account, $lookup, $watch['started_at'] ); |
| 178 | } |
| 179 | |
| 180 | $delay = self::next_delay( $elapsed ); |
| 181 | self::note_run( $watch['runs'], null === $delay ? 'gave_up' : ( empty( $lookup['all_found'] ) ? 'waiting' : 'found' ), $elapsed, $delay ); |
| 182 | if ( null === $delay ) { |
| 183 | self::stop(); |
| 184 | return; |
| 185 | } |
| 186 | wp_schedule_single_event( time() + $delay, self::HOOK ); |
| 187 | } finally { |
| 188 | delete_option( self::LOCK_OPTION ); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * Note one background check in the debug log. |
| 194 | * |
| 195 | * @param int $run Which run it was. |
| 196 | * @param string $outcome `passed`, `found`, `waiting` or `gave_up`. |
| 197 | * @param int $elapsed Seconds since the watch started. |
| 198 | * @param int|null $next Seconds until the next run, or null for none. |
| 199 | * @return void |
| 200 | */ |
| 201 | private static function note_run( $run, $outcome, $elapsed, $next = null ) { |
| 202 | Debug_Log::add( |
| 203 | 'gave_up' === $outcome ? 'warning' : ( 'passed' === $outcome ? 'info' : 'debug' ), |
| 204 | 'domain', |
| 205 | 'dns.watch', |
| 206 | /* translators: 1: which background check it was, 2: what it found, e.g. waiting. */ |
| 207 | sprintf( __( 'Background check %1$d: %2$s.', 'jetpack-send-pkg' ), $run, $outcome ), |
| 208 | array( |
| 209 | 'run' => (int) $run, |
| 210 | 'outcome' => $outcome, |
| 211 | 'elapsed' => (int) $elapsed, |
| 212 | 'next' => $next, |
| 213 | ) |
| 214 | ); |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Seconds until the next run: 15 minutes for 2 hours, hourly to 48 hours, then daily. |
| 219 | * |
| 220 | * @param int $elapsed Seconds since the watch started. |
| 221 | * @return int|null Delay, or null once MAX_AGE has passed. |
| 222 | */ |
| 223 | public static function next_delay( $elapsed ) { |
| 224 | $elapsed = max( 0, (int) $elapsed ); |
| 225 | $remaining = self::MAX_AGE - $elapsed; |
| 226 | if ( $remaining <= 0 ) { |
| 227 | return null; |
| 228 | } |
| 229 | |
| 230 | if ( $elapsed < 2 * HOUR_IN_SECONDS ) { |
| 231 | $delay = 15 * MINUTE_IN_SECONDS; |
| 232 | } elseif ( $elapsed < self::STALL_AFTER ) { |
| 233 | $delay = HOUR_IN_SECONDS; |
| 234 | } else { |
| 235 | $delay = DAY_IN_SECONDS; |
| 236 | } |
| 237 | // The last run lands on day 7 rather than after it. |
| 238 | return min( $delay, $remaining ); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * When the next run is scheduled, for the status payload. |
| 243 | * |
| 244 | * @return string|null ISO 8601 time, or null when not watching. |
| 245 | */ |
| 246 | public static function next_check_at() { |
| 247 | if ( ! self::progress() ) { |
| 248 | return null; |
| 249 | } |
| 250 | $next = wp_next_scheduled( self::HOOK ); |
| 251 | return $next ? gmdate( 'c', (int) $next ) : null; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * The stored progress, or null when not watching. |
| 256 | * |
| 257 | * @return array{started_at: int, runs: int, stalled_notified_at: int|null}|null |
| 258 | */ |
| 259 | private static function progress() { |
| 260 | $watch = get_option( self::OPTION ); |
| 261 | if ( ! is_array( $watch ) || empty( $watch['started_at'] ) ) { |
| 262 | return null; |
| 263 | } |
| 264 | return array( |
| 265 | 'started_at' => (int) $watch['started_at'], |
| 266 | 'runs' => (int) ( $watch['runs'] ?? 0 ), |
| 267 | 'stalled_notified_at' => empty( $watch['stalled_notified_at'] ) ? null : (int) $watch['stalled_notified_at'], |
| 268 | ); |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Take the run lock; false when another run holds a fresh one. |
| 273 | * |
| 274 | * @return bool |
| 275 | */ |
| 276 | private static function lock() { |
| 277 | if ( add_option( self::LOCK_OPTION, time(), '', false ) ) { |
| 278 | return true; |
| 279 | } |
| 280 | if ( time() - (int) get_option( self::LOCK_OPTION ) < self::LOCK_TTL ) { |
| 281 | return false; |
| 282 | } |
| 283 | update_option( self::LOCK_OPTION, time(), false ); |
| 284 | return true; |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Whether the account's last mail-service check passes every required record. |
| 289 | * |
| 290 | * @param array $account Stored account. |
| 291 | * @return bool |
| 292 | */ |
| 293 | private static function passes( array $account ) { |
| 294 | return array() === REST_Controller::enable_blockers( $account ); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * Ask the mail service to check the domain and store its verdicts. |
| 299 | * |
| 300 | * @param array $account Stored account. |
| 301 | * @return array The account, updated when the check answered. |
| 302 | */ |
| 303 | private static function check_with_mail_service( array $account ) { |
| 304 | $response = ( new MailChannels_Client( $account['api_key'] ) )->check_domain( $account['domain'], (string) ( $account['dkim_selector'] ?? '' ) ); |
| 305 | if ( is_wp_error( $response ) || ! is_array( $response ) ) { |
| 306 | return $account; |
| 307 | } |
| 308 | |
| 309 | $check = Dns_Check::normalize( $response, self::existing_spf( $account ) ); |
| 310 | Account::update( array( 'dns_check' => $check ) ); |
| 311 | REST_Controller::note_dns_check( (string) $account['domain'], $check ); |
| 312 | $updated = Account::get(); |
| 313 | return $updated ? $updated : $account; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * The domain's SPF record, looked up through Dns_Lookup; the last known one when the lookup fails. |
| 318 | * |
| 319 | * @param array $account Stored account. |
| 320 | * @return string |
| 321 | */ |
| 322 | private static function existing_spf( array $account ) { |
| 323 | $values = Dns_Lookup::txt_values( (string) $account['domain'] ); |
| 324 | if ( false === $values ) { |
| 325 | $check = $account['dns_check'] ?? null; |
| 326 | return (string) ( is_array( $check ) && isset( $check['existing_spf'] ) ? $check['existing_spf'] : ( $account['existing_spf'] ?? '' ) ); |
| 327 | } |
| 328 | foreach ( $values as $txt ) { |
| 329 | if ( 0 === stripos( $txt, 'v=spf1' ) ) { |
| 330 | return $txt; |
| 331 | } |
| 332 | } |
| 333 | return ''; |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * The records passed: turn sending on, send the one automatic test, stop watching. |
| 338 | * |
| 339 | * @return void |
| 340 | */ |
| 341 | private static function finish() { |
| 342 | Onboarding::maybe_auto_enable(); |
| 343 | |
| 344 | $settings = Settings::get(); |
| 345 | $state = Onboarding::state(); |
| 346 | // Someone checked from the Send screen in the last minute, so they see it's ready and send their own test. |
| 347 | $watching = false !== get_transient( REST_Controller::CHECK_DNS_THROTTLE ); |
| 348 | if ( ! $watching && ! empty( $settings['enabled'] ) && empty( $state['test_sent_at'] ) && empty( $state['auto_test_log_id'] ) ) { |
| 349 | $to = (string) ( $state['test_to'] ?? '' ); |
| 350 | if ( self::can_receive_test( $to ) ) { |
| 351 | $result = Mailer::send_test( $to, 'auto' ); |
| 352 | $log_id = is_wp_error( $result ) ? ( $result->get_error_data()['log_id'] ?? '' ) : ( $result['log_id'] ?? '' ); |
| 353 | if ( '' !== (string) $log_id ) { |
| 354 | Onboarding::record( array( 'auto_test_log_id' => (string) $log_id ) ); |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | self::stop(); |
| 360 | } |
| 361 | |
| 362 | /** |
| 363 | * Whether the address belongs to a user who can still manage Send. |
| 364 | * |
| 365 | * @param string $email Address captured at setup. |
| 366 | * @return bool |
| 367 | */ |
| 368 | private static function can_receive_test( $email ) { |
| 369 | if ( ! is_email( $email ) ) { |
| 370 | return false; |
| 371 | } |
| 372 | $user = get_user_by( 'email', $email ); |
| 373 | return $user && user_can( $user, 'manage_options' ); |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * Email the person who ran setup once, through the host's mail, when the records still aren't there. |
| 378 | * |
| 379 | * @param array $account Stored account. |
| 380 | * @param array $lookup Local lookup, for naming what's missing. |
| 381 | * @param int $started_at When the watch started. |
| 382 | * @return void |
| 383 | */ |
| 384 | private static function send_stall_email( array $account, $lookup, $started_at ) { |
| 385 | $state = Onboarding::state(); |
| 386 | $to = (string) ( $state['test_to'] ?? '' ); |
| 387 | if ( ! is_email( $to ) ) { |
| 388 | $to = (string) get_option( 'admin_email' ); |
| 389 | } |
| 390 | if ( ! is_email( $to ) ) { |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | $user = get_user_by( 'email', $to ); |
| 395 | $switched_locale = $user && function_exists( 'switch_to_user_locale' ) && switch_to_user_locale( $user->ID ); |
| 396 | |
| 397 | $domain = (string) $account['domain']; |
| 398 | /* translators: %s: the domain email is sent from, e.g. example.com. */ |
| 399 | $subject = sprintf( __( '%s isn’t connected to Jetpack Send yet', 'jetpack-send-pkg' ), $domain ); |
| 400 | |
| 401 | $all_found = is_array( $lookup ) && ! empty( $lookup['all_found'] ); |
| 402 | $lines = array( |
| 403 | $all_found |
| 404 | /* translators: %s: the domain email is sent from, e.g. example.com. */ |
| 405 | ? sprintf( __( 'We can see both records for %s. Jetpack Send is still waiting for the mail service to confirm them. We’ve been checking for two days.', 'jetpack-send-pkg' ), $domain ) |
| 406 | /* translators: %s: the domain email is sent from, e.g. example.com. */ |
| 407 | : sprintf( __( 'Jetpack Send is still waiting for the records for %s. We’ve been checking for two days.', 'jetpack-send-pkg' ), $domain ), |
| 408 | ); |
| 409 | $missing = self::missing_lines( $lookup, $domain ); |
| 410 | if ( $missing ) { |
| 411 | $lines[] = ''; |
| 412 | $lines[] = __( 'Still to do:', 'jetpack-send-pkg' ); |
| 413 | foreach ( $missing as $line ) { |
| 414 | $lines[] = '- ' . $line; |
| 415 | } |
| 416 | } |
| 417 | if ( ! $all_found ) { |
| 418 | $lines[] = ''; |
| 419 | $lines[] = __( 'Check both records are saved where your domain is managed. Some providers take up to a day.', 'jetpack-send-pkg' ); |
| 420 | } |
| 421 | $lines[] = ''; |
| 422 | /* translators: %s: link to the Jetpack Send screen in wp-admin. */ |
| 423 | $lines[] = sprintf( __( 'See the records and what to change: %s', 'jetpack-send-pkg' ), add_query_arg( 'welcome', '1', Admin_Page::dashboard_url() ) ); |
| 424 | $lines[] = ''; |
| 425 | $lines[] = sprintf( |
| 426 | /* translators: %s: date the automatic checks stop, e.g. October 25, 2026. */ |
| 427 | __( 'We’ll keep checking until %s. Until then, your site’s emails go out through your host as usual.', 'jetpack-send-pkg' ), |
| 428 | wp_date( (string) get_option( 'date_format', 'F j, Y' ), $started_at + self::MAX_AGE ) |
| 429 | ); |
| 430 | |
| 431 | // Send isn't sending for this site yet, so the host delivers this and it stays out of Send's log. |
| 432 | $priority = has_filter( 'pre_wp_mail', array( Mailer::class, 'pre_wp_mail' ) ); |
| 433 | if ( false !== $priority ) { |
| 434 | remove_filter( 'pre_wp_mail', array( Mailer::class, 'pre_wp_mail' ), $priority ); |
| 435 | } |
| 436 | try { |
| 437 | wp_mail( $to, $subject, implode( "\n", $lines ) ); |
| 438 | } finally { |
| 439 | if ( false !== $priority ) { |
| 440 | add_filter( 'pre_wp_mail', array( Mailer::class, 'pre_wp_mail' ), $priority, 2 ); |
| 441 | } |
| 442 | if ( $switched_locale ) { |
| 443 | restore_previous_locale(); |
| 444 | } |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * One plain line for each record that isn't there yet. |
| 450 | * |
| 451 | * @param array $lookup Local lookup. |
| 452 | * @param string $domain Sending domain. |
| 453 | * @return string[] |
| 454 | */ |
| 455 | private static function missing_lines( $lookup, $domain ) { |
| 456 | $lines = array(); |
| 457 | foreach ( (array) ( $lookup['records'] ?? array() ) as $record ) { |
| 458 | $state = (string) ( $record['state'] ?? '' ); |
| 459 | if ( in_array( $state, array( 'found', 'verified' ), true ) ) { |
| 460 | continue; |
| 461 | } |
| 462 | $purpose = (string) ( $record['purpose'] ?? '' ); |
| 463 | if ( 'sender_domain' === $purpose ) { |
| 464 | /* translators: %s: the domain email is sent from, e.g. example.com. */ |
| 465 | $lines[] = sprintf( __( '%s isn’t pointing at a website or mailbox yet.', 'jetpack-send-pkg' ), $domain ); |
| 466 | continue; |
| 467 | } |
| 468 | $label = self::record_label( $purpose, $domain ); |
| 469 | if ( '' === $label ) { |
| 470 | continue; |
| 471 | } |
| 472 | $lines[] = 'needs_fix' === $state |
| 473 | ? self::fix_line( $label, (string) ( $record['problem'] ?? '' ) ) |
| 474 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 475 | : sprintf( __( '%s: not found yet', 'jetpack-send-pkg' ), $label ); |
| 476 | } |
| 477 | return $lines; |
| 478 | } |
| 479 | |
| 480 | /** |
| 481 | * One plain line naming what's wrong with a record, in the setup screen's words. |
| 482 | * |
| 483 | * @param string $label What the record does. |
| 484 | * @param string $problem Problem code from the lookup. |
| 485 | * @return string |
| 486 | */ |
| 487 | private static function fix_line( $label, $problem ) { |
| 488 | switch ( $problem ) { |
| 489 | case 'wrong_value': |
| 490 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 491 | return sprintf( __( '%s: doesn’t match', 'jetpack-send-pkg' ), $label ); |
| 492 | case 'doubled': |
| 493 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 494 | return sprintf( __( '%s: name doubled', 'jetpack-send-pkg' ), $label ); |
| 495 | case 'conflict': |
| 496 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 497 | return sprintf( __( '%s: old record in the way', 'jetpack-send-pkg' ), $label ); |
| 498 | case 'proxied': |
| 499 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 500 | return sprintf( __( '%s: proxy on', 'jetpack-send-pkg' ), $label ); |
| 501 | case 'not_live': |
| 502 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 503 | return sprintf( __( '%s: not live yet', 'jetpack-send-pkg' ), $label ); |
| 504 | default: |
| 505 | /* translators: %s: what the record does, e.g. "Signs your emails so inboxes trust them". */ |
| 506 | return sprintf( __( '%s: needs a change', 'jetpack-send-pkg' ), $label ); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * The plain name of a record, as the setup screens show it. |
| 512 | * |
| 513 | * @param string $purpose `lockdown`, `dkim` or `spf`. |
| 514 | * @param string $domain Sending domain. |
| 515 | * @return string |
| 516 | */ |
| 517 | private static function record_label( $purpose, $domain ) { |
| 518 | switch ( $purpose ) { |
| 519 | case 'lockdown': |
| 520 | /* translators: %s: the domain email is sent from, e.g. example.com. */ |
| 521 | return sprintf( __( 'Lets Jetpack send for %s', 'jetpack-send-pkg' ), $domain ); |
| 522 | case 'dkim': |
| 523 | return __( 'Signs your emails so inboxes trust them', 'jetpack-send-pkg' ); |
| 524 | case 'spf': |
| 525 | return __( 'Lists Jetpack as an approved sender', 'jetpack-send-pkg' ); |
| 526 | default: |
| 527 | return ''; |
| 528 | } |
| 529 | } |
| 530 | } |