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| 1 | <?php |
| 2 | /** |
| 3 | * Report WordPress recovery-mode state to wpcom via a dedicated endpoint so |
| 4 | * wpcom-side consumers can surface "needs recovery" / "in recovery" states |
| 5 | * for the site. |
| 6 | * |
| 7 | * Three timestamps are POSTed to `/sites/{blog_id}/recovery-mode-status`: |
| 8 | * |
| 9 | * - `recovery_mode_email_last_sent` — written by WP core each time a fatal |
| 10 | * triggers a recovery email (rate-limited to ~1/day). |
| 11 | * - `recovery_session_entered_at` — wpcomsh-managed; updated on any write |
| 12 | * to `{session_id}_paused_extensions`, i.e. when the admin enters a |
| 13 | * recovery session by clicking the email link. |
| 14 | * - `recovery_session_exited_at` — wpcomsh-managed; updated on deletion |
| 15 | * of `{session_id}_paused_extensions`, i.e. when the admin exits recovery. |
| 16 | * |
| 17 | * The POST runs from a PHP shutdown function so the signal reaches wpcom even |
| 18 | * on fatal-error requests, matching the pattern used by migrate-guru-canary. |
| 19 | * |
| 20 | * @package wpcomsh |
| 21 | */ |
| 22 | |
| 23 | use Automattic\Jetpack\Connection\Client as Jetpack_Connection_Client; |
| 24 | |
| 25 | /** |
| 26 | * Captures recovery-mode option writes and forwards a state snapshot to wpcom |
| 27 | * on PHP shutdown. |
| 28 | */ |
| 29 | class WPCOMSH_Recovery_Mode_Sync { |
| 30 | |
| 31 | private const EMAIL_LAST_SENT_OPTION = 'recovery_mode_email_last_sent'; |
| 32 | private const ENTERED_AT_OPTION = 'wpcomsh_recovery_session_entered_at'; |
| 33 | private const EXITED_AT_OPTION = 'wpcomsh_recovery_session_exited_at'; |
| 34 | private const PAUSED_EXTENSIONS_OPTION_SUFFIX = '_paused_extensions'; |
| 35 | |
| 36 | /** |
| 37 | * Pending state snapshot. Empty until the first capture this request — |
| 38 | * its non-emptiness doubles as the "send needed" flag. |
| 39 | * |
| 40 | * @var array<string,int> |
| 41 | */ |
| 42 | private static $payload = array(); |
| 43 | |
| 44 | /** |
| 45 | * Register option-change listeners. |
| 46 | */ |
| 47 | public static function init() { |
| 48 | add_action( 'add_option_' . self::EMAIL_LAST_SENT_OPTION, array( __CLASS__, 'capture_email_last_sent' ) ); |
| 49 | add_action( 'update_option_' . self::EMAIL_LAST_SENT_OPTION, array( __CLASS__, 'capture_email_last_sent' ) ); |
| 50 | |
| 51 | // Only `added_option` signals a new recovery session. `updated_option` |
| 52 | // fires for in-session extension additions and — crucially — during |
| 53 | // exit unwinding when `WP_Paused_Extensions_Storage::delete_all()` of |
| 54 | // one type rewrites the session option with remaining entries of the |
| 55 | // other type; treating that as a new entry would clobber entered_at. |
| 56 | add_action( 'added_option', array( __CLASS__, 'capture_session_start' ), 10, 1 ); |
| 57 | add_action( 'deleted_option', array( __CLASS__, 'capture_session_end' ), 10, 1 ); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Listener for the recovery-mode email timestamp. |
| 62 | */ |
| 63 | public static function capture_email_last_sent() { |
| 64 | self::snapshot(); |
| 65 | self::trace( |
| 66 | 'captured email_last_sent', |
| 67 | array( 'value' => self::$payload['recovery_mode_email_last_sent'] ) |
| 68 | ); |
| 69 | self::send(); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Listener for option writes that may represent entering a recovery session. |
| 74 | * |
| 75 | * @param string $option Option name. |
| 76 | */ |
| 77 | public static function capture_session_start( $option ) { |
| 78 | if ( ! self::is_paused_extensions_option( $option ) ) { |
| 79 | return; |
| 80 | } |
| 81 | $now = time(); |
| 82 | update_option( self::ENTERED_AT_OPTION, $now, false ); |
| 83 | self::snapshot(); |
| 84 | self::trace( |
| 85 | 'captured session_start', |
| 86 | array( |
| 87 | 'option' => $option, |
| 88 | 'entered_at' => $now, |
| 89 | ) |
| 90 | ); |
| 91 | self::send(); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Listener for option deletions that represent exiting a recovery session. |
| 96 | * |
| 97 | * @param string $option Option name. |
| 98 | */ |
| 99 | public static function capture_session_end( $option ) { |
| 100 | if ( ! self::is_paused_extensions_option( $option ) ) { |
| 101 | return; |
| 102 | } |
| 103 | $now = time(); |
| 104 | update_option( self::EXITED_AT_OPTION, $now, false ); |
| 105 | self::snapshot(); |
| 106 | self::trace( |
| 107 | 'captured session_end', |
| 108 | array( |
| 109 | 'option' => $option, |
| 110 | 'exited_at' => $now, |
| 111 | ) |
| 112 | ); |
| 113 | self::send(); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * POST the current state snapshot to wpcom. Called synchronously from each |
| 118 | * capture listener — we deliberately do *not* defer to a PHP shutdown |
| 119 | * function because option writes that trigger a capture often happen from |
| 120 | * inside WP's own fatal-handler shutdown callback, and shutdown callbacks |
| 121 | * registered at that point (or even earlier) are not reliably invoked on |
| 122 | * the dying request. |
| 123 | */ |
| 124 | public static function send() { |
| 125 | if ( empty( self::$payload ) ) { |
| 126 | return; |
| 127 | } |
| 128 | if ( ! class_exists( Jetpack_Connection_Client::class ) ) { |
| 129 | self::trace( 'send() aborting: Jetpack Connection Client class missing' ); |
| 130 | return; |
| 131 | } |
| 132 | if ( ! function_exists( '_wpcom_get_current_blog_id' ) ) { |
| 133 | self::trace( 'send() aborting: _wpcom_get_current_blog_id() not defined' ); |
| 134 | return; |
| 135 | } |
| 136 | |
| 137 | // The Connection Client signs requests with wp_rand() / wp_generate_password(), |
| 138 | // both defined in pluggable.php. That file is loaded late in WP's bootstrap and |
| 139 | // is often not yet available when we're called from inside WP's fatal-handler |
| 140 | // shutdown path (the exact case this feature exists to handle). Load it here. |
| 141 | if ( ! function_exists( 'wp_rand' ) && defined( 'ABSPATH' ) ) { |
| 142 | $pluggable_path = ABSPATH . 'wp-includes/pluggable.php'; |
| 143 | if ( file_exists( $pluggable_path ) ) { |
| 144 | require_once $pluggable_path; |
| 145 | } |
| 146 | } |
| 147 | if ( ! function_exists( 'wp_rand' ) ) { |
| 148 | self::trace( 'send() aborting: wp_rand() unavailable' ); |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | try { |
| 153 | $wpcom_blog_id = _wpcom_get_current_blog_id(); |
| 154 | if ( ! $wpcom_blog_id ) { |
| 155 | self::trace( 'send() aborting: blog_id is falsy', array( 'value' => $wpcom_blog_id ) ); |
| 156 | return; |
| 157 | } |
| 158 | |
| 159 | self::trace( |
| 160 | 'posting state', |
| 161 | array( |
| 162 | 'blog_id' => $wpcom_blog_id, |
| 163 | 'payload' => self::$payload, |
| 164 | ) |
| 165 | ); |
| 166 | |
| 167 | $response = Jetpack_Connection_Client::wpcom_json_api_request_as_blog( |
| 168 | sprintf( '/sites/%s/recovery-mode-status', $wpcom_blog_id ), |
| 169 | 'v2', |
| 170 | array( 'method' => 'POST' ), |
| 171 | self::$payload, |
| 172 | 'wpcom' |
| 173 | ); |
| 174 | |
| 175 | if ( is_wp_error( $response ) ) { |
| 176 | self::trace( |
| 177 | 'post returned WP_Error', |
| 178 | array( 'error' => $response->get_error_message() ) |
| 179 | ); |
| 180 | } else { |
| 181 | $code = (int) wp_remote_retrieve_response_code( $response ); |
| 182 | if ( $code < 200 || $code >= 300 ) { |
| 183 | self::trace( |
| 184 | 'post returned non-2xx', |
| 185 | array( 'code' => $code ) |
| 186 | ); |
| 187 | } |
| 188 | } |
| 189 | } catch ( \Throwable $e ) { |
| 190 | self::trace( |
| 191 | 'post threw', |
| 192 | array( 'exception' => $e->getMessage() ) |
| 193 | ); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Populate the in-memory state snapshot once per request. |
| 199 | */ |
| 200 | private static function snapshot() { |
| 201 | if ( ! empty( self::$payload ) ) { |
| 202 | return; |
| 203 | } |
| 204 | self::$payload = array( |
| 205 | 'recovery_mode_email_last_sent' => (int) get_option( self::EMAIL_LAST_SENT_OPTION, 0 ), |
| 206 | 'recovery_session_entered_at' => (int) get_option( self::ENTERED_AT_OPTION, 0 ), |
| 207 | 'recovery_session_exited_at' => (int) get_option( self::EXITED_AT_OPTION, 0 ), |
| 208 | ); |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * Whether the given option name is a recovery-session paused-extensions |
| 213 | * option (session-scoped, dynamically named). |
| 214 | * |
| 215 | * @param string $option Option name. |
| 216 | * @return bool |
| 217 | */ |
| 218 | private static function is_paused_extensions_option( $option ) { |
| 219 | return is_string( $option ) && str_ends_with( $option, self::PAUSED_EXTENSIONS_OPTION_SUFFIX ); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Emit a trace log to error_log when opted in via filter. Default is off. |
| 224 | * |
| 225 | * Enable on a specific site with: |
| 226 | * add_filter( 'wpcomsh_recovery_mode_sync_logging_enabled', '__return_true' ); |
| 227 | * |
| 228 | * @param string $message Trace message. |
| 229 | * @param array $extra Optional structured context. |
| 230 | */ |
| 231 | private static function trace( $message, $extra = array() ) { |
| 232 | /** |
| 233 | * Whether to emit recovery-mode-sync trace logs to error_log. |
| 234 | * |
| 235 | * @param bool $enabled Defaults to false. |
| 236 | */ |
| 237 | if ( ! apply_filters( 'wpcomsh_recovery_mode_sync_logging_enabled', false ) ) { |
| 238 | return; |
| 239 | } |
| 240 | static $request_id = null; |
| 241 | if ( $request_id === null ) { |
| 242 | $request_id = substr( md5( uniqid( '', true ) ), 0, 8 ); |
| 243 | } |
| 244 | // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log |
| 245 | error_log( 'wpcomsh_recovery_mode_sync[' . $request_id . ']: ' . $message . ' ' . wp_json_encode( $extra, JSON_UNESCAPED_SLASHES ) ); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | WPCOMSH_Recovery_Mode_Sync::init(); |