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/wp-content/plugins/akismet/ -> class.akismet.php (source)

   1  <?php
   2  
   3  class Akismet {
   4      const API_HOST = 'rest.akismet.com';
   5      const API_PORT = 80;
   6      const MAX_DELAY_BEFORE_MODERATION_EMAIL = 86400; // One day in seconds
   7  
   8      public static $limit_notices = array(
   9          10501 => 'FIRST_MONTH_OVER_LIMIT',
  10          10502 => 'SECOND_MONTH_OVER_LIMIT',
  11          10504 => 'THIRD_MONTH_APPROACHING_LIMIT',
  12          10508 => 'THIRD_MONTH_OVER_LIMIT',
  13          10516 => 'FOUR_PLUS_MONTHS_OVER_LIMIT',
  14      );
  15  
  16      private static $last_comment = '';
  17      private static $initiated = false;
  18      private static $prevent_moderation_email_for_these_comments = array();
  19      private static $last_comment_result = null;
  20      private static $comment_as_submitted_allowed_keys = array( 'blog' => '', 'blog_charset' => '', 'blog_lang' => '', 'blog_ua' => '', 'comment_agent' => '', 'comment_author' => '', 'comment_author_IP' => '', 'comment_author_email' => '', 'comment_author_url' => '', 'comment_content' => '', 'comment_date_gmt' => '', 'comment_tags' => '', 'comment_type' => '', 'guid' => '', 'is_test' => '', 'permalink' => '', 'reporter' => '', 'site_domain' => '', 'submit_referer' => '', 'submit_uri' => '', 'user_ID' => '', 'user_agent' => '', 'user_id' => '', 'user_ip' => '' );
  21      
  22  	public static function init() {
  23          if ( ! self::$initiated ) {
  24              self::init_hooks();
  25          }
  26      }
  27  
  28      /**
  29       * Initializes WordPress hooks
  30       */
  31  	private static function init_hooks() {
  32          self::$initiated = true;
  33  
  34          add_action( 'wp_insert_comment', array( 'Akismet', 'auto_check_update_meta' ), 10, 2 );
  35          add_filter( 'preprocess_comment', array( 'Akismet', 'auto_check_comment' ), 1 );
  36          add_filter( 'rest_pre_insert_comment', array( 'Akismet', 'rest_auto_check_comment' ), 1 );
  37  
  38          add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments' ) );
  39          add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments_meta' ) );
  40          add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_orphaned_commentmeta' ) );
  41          add_action( 'akismet_schedule_cron_recheck', array( 'Akismet', 'cron_recheck' ) );
  42  
  43          add_action( 'comment_form',  array( 'Akismet',  'add_comment_nonce' ), 1 );
  44          add_action( 'comment_form', array( 'Akismet', 'output_custom_form_fields' ) );
  45  
  46          add_filter( 'comment_moderation_recipients', array( 'Akismet', 'disable_moderation_emails_if_unreachable' ), 1000, 2 );
  47          add_filter( 'pre_comment_approved', array( 'Akismet', 'last_comment_status' ), 10, 2 );
  48          
  49          add_action( 'transition_comment_status', array( 'Akismet', 'transition_comment_status' ), 10, 3 );
  50  
  51          // Run this early in the pingback call, before doing a remote fetch of the source uri
  52          add_action( 'xmlrpc_call', array( 'Akismet', 'pre_check_pingback' ) );
  53  
  54          // Jetpack compatibility
  55          add_filter( 'jetpack_options_whitelist', array( 'Akismet', 'add_to_jetpack_options_whitelist' ) );
  56          add_filter( 'jetpack_contact_form_html', array( 'Akismet', 'inject_custom_form_fields' ) );
  57          add_filter( 'jetpack_contact_form_akismet_values', array( 'Akismet', 'prepare_custom_form_values' ) );
  58  
  59          // Gravity Forms
  60          add_filter( 'gform_get_form_filter', array( 'Akismet', 'inject_custom_form_fields' ) );
  61          add_filter( 'gform_akismet_fields', array( 'Akismet', 'prepare_custom_form_values' ) );
  62  
  63          // Contact Form 7
  64          add_filter( 'wpcf7_form_elements', array( 'Akismet', 'append_custom_form_fields' ) );
  65          add_filter( 'wpcf7_akismet_parameters', array( 'Akismet', 'prepare_custom_form_values' ) );
  66  
  67          // Formidable Forms
  68          add_filter( 'frm_filter_final_form', array( 'Akismet', 'inject_custom_form_fields' ) );
  69          add_filter( 'frm_akismet_values', array( 'Akismet', 'prepare_custom_form_values' ) );
  70  
  71          // Fluent Forms
  72          add_filter( 'fluentform_form_element_start', array( 'Akismet', 'output_custom_form_fields' ) );
  73          add_filter( 'fluentform_akismet_fields', array( 'Akismet', 'prepare_custom_form_values' ), 10, 2 );
  74  
  75          add_action( 'update_option_wordpress_api_key', array( 'Akismet', 'updated_option' ), 10, 2 );
  76          add_action( 'add_option_wordpress_api_key', array( 'Akismet', 'added_option' ), 10, 2 );
  77  
  78          add_action( 'comment_form_after',  array( 'Akismet',  'display_comment_form_privacy_notice' ) );
  79      }
  80  
  81  	public static function get_api_key() {
  82          return apply_filters( 'akismet_get_api_key', defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key') );
  83      }
  84  
  85  	public static function check_key_status( $key, $ip = null ) {
  86          return self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option( 'home' ) ) ), 'verify-key', $ip );
  87      }
  88  
  89  	public static function verify_key( $key, $ip = null ) {
  90          // Shortcut for obviously invalid keys.
  91          if ( strlen( $key ) != 12 ) {
  92              return 'invalid';
  93          }
  94          
  95          $response = self::check_key_status( $key, $ip );
  96  
  97          if ( $response[1] != 'valid' && $response[1] != 'invalid' )
  98              return 'failed';
  99  
 100          return $response[1];
 101      }
 102  
 103  	public static function deactivate_key( $key ) {
 104          $response = self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option( 'home' ) ) ), 'deactivate' );
 105  
 106          if ( $response[1] != 'deactivated' )
 107              return 'failed';
 108  
 109          return $response[1];
 110      }
 111  
 112      /**
 113       * Add the akismet option to the Jetpack options management whitelist.
 114       *
 115       * @param array $options The list of whitelisted option names.
 116       * @return array The updated whitelist
 117       */
 118  	public static function add_to_jetpack_options_whitelist( $options ) {
 119          $options[] = 'wordpress_api_key';
 120          return $options;
 121      }
 122  
 123      /**
 124       * When the akismet option is updated, run the registration call.
 125       *
 126       * This should only be run when the option is updated from the Jetpack/WP.com
 127       * API call, and only if the new key is different than the old key.
 128       *
 129       * @param mixed  $old_value   The old option value.
 130       * @param mixed  $value       The new option value.
 131       */
 132  	public static function updated_option( $old_value, $value ) {
 133          // Not an API call
 134          if ( ! class_exists( 'WPCOM_JSON_API_Update_Option_Endpoint' ) ) {
 135              return;
 136          }
 137          // Only run the registration if the old key is different.
 138          if ( $old_value !== $value ) {
 139              self::verify_key( $value );
 140          }
 141      }
 142      
 143      /**
 144       * Treat the creation of an API key the same as updating the API key to a new value.
 145       *
 146       * @param mixed  $option_name   Will always be "wordpress_api_key", until something else hooks in here.
 147       * @param mixed  $value         The option value.
 148       */
 149  	public static function added_option( $option_name, $value ) {
 150          if ( 'wordpress_api_key' === $option_name ) {
 151              return self::updated_option( '', $value );
 152          }
 153      }
 154      
 155  	public static function rest_auto_check_comment( $commentdata ) {
 156          return self::auto_check_comment( $commentdata, 'rest_api' );
 157      }
 158  
 159      /**
 160       * Check a comment for spam.
 161       *
 162       * @param array $commentdata
 163       * @param string $context What kind of request triggered this comment check? Possible values are 'default', 'rest_api', and 'xml-rpc'.
 164       * @return array|WP_Error Either the $commentdata array with additional entries related to its spam status
 165       *                        or a WP_Error, if it's a REST API request and the comment should be discarded.
 166       */
 167  	public static function auto_check_comment( $commentdata, $context = 'default' ) {
 168          // If no key is configured, then there's no point in doing any of this.
 169          if ( ! self::get_api_key() ) {
 170              return $commentdata;
 171          }
 172  
 173          self::$last_comment_result = null;
 174  
 175          $comment = $commentdata;
 176  
 177          $comment['user_ip']      = self::get_ip_address();
 178          $comment['user_agent']   = self::get_user_agent();
 179          $comment['referrer']     = self::get_referer();
 180          $comment['blog']         = get_option( 'home' );
 181          $comment['blog_lang']    = get_locale();
 182          $comment['blog_charset'] = get_option('blog_charset');
 183          $comment['permalink']    = get_permalink( $comment['comment_post_ID'] );
 184  
 185          if ( ! empty( $comment['user_ID'] ) ) {
 186              $comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );
 187          }
 188  
 189          /** See filter documentation in init_hooks(). */
 190          $akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
 191          $comment['akismet_comment_nonce'] = 'inactive';
 192          if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
 193              $comment['akismet_comment_nonce'] = 'failed';
 194              if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
 195                  $comment['akismet_comment_nonce'] = 'passed';
 196  
 197              // comment reply in wp-admin
 198              if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
 199                  $comment['akismet_comment_nonce'] = 'passed';
 200  
 201          }
 202  
 203          if ( self::is_test_mode() )
 204              $comment['is_test'] = 'true';
 205  
 206          foreach( $_POST as $key => $value ) {
 207              if ( is_string( $value ) )
 208                  $comment["POST_{$key}"] = $value;
 209          }
 210  
 211          foreach ( $_SERVER as $key => $value ) {
 212              if ( ! is_string( $value ) ) {
 213                  continue;
 214              }
 215  
 216              if ( preg_match( "/^HTTP_COOKIE/", $key ) ) {
 217                  continue;
 218              }
 219  
 220              // Send any potentially useful $_SERVER vars, but avoid sending junk we don't need.
 221              if ( preg_match( "/^(HTTP_|REMOTE_ADDR|REQUEST_URI|DOCUMENT_URI)/", $key ) ) {
 222                  $comment[ "$key" ] = $value;
 223              }
 224          }
 225  
 226          $post = get_post( $comment['comment_post_ID'] );
 227  
 228          if ( ! is_null( $post ) ) {
 229              // $post can technically be null, although in the past, it's always been an indicator of another plugin interfering.
 230              $comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;
 231          }
 232  
 233          $response = self::http_post( Akismet::build_query( $comment ), 'comment-check' );
 234  
 235          do_action( 'akismet_comment_check_response', $response );
 236  
 237          $commentdata['comment_as_submitted'] = array_intersect_key( $comment, self::$comment_as_submitted_allowed_keys );
 238  
 239          // Also include any form fields we inject into the comment form, like ak_js
 240          foreach ( $_POST as $key => $value ) {
 241              if ( is_string( $value ) && strpos( $key, 'ak_' ) === 0 ) {
 242                  $commentdata['comment_as_submitted'][ 'POST_' . $key ] = $value;
 243              }
 244          }
 245  
 246          $commentdata['akismet_result'] = $response[1];
 247  
 248          if ( isset( $response[0]['x-akismet-pro-tip'] ) )
 249              $commentdata['akismet_pro_tip'] = $response[0]['x-akismet-pro-tip'];
 250  
 251          if ( isset( $response[0]['x-akismet-error'] ) ) {
 252              // An error occurred that we anticipated (like a suspended key) and want the user to act on.
 253              // Send to moderation.
 254              self::$last_comment_result = '0';
 255          }
 256          else if ( 'true' == $response[1] ) {
 257              // akismet_spam_count will be incremented later by comment_is_spam()
 258              self::$last_comment_result = 'spam';
 259  
 260              $discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() );
 261  
 262              do_action( 'akismet_spam_caught', $discard );
 263  
 264              if ( $discard ) {
 265                  // The spam is obvious, so we're bailing out early. 
 266                  // akismet_result_spam() won't be called so bump the counter here
 267                  if ( $incr = apply_filters( 'akismet_spam_count_incr', 1 ) ) {
 268                      update_option( 'akismet_spam_count', get_option( 'akismet_spam_count' ) + $incr );
 269                  }
 270  
 271                  if ( 'rest_api' === $context ) {
 272                      return new WP_Error( 'akismet_rest_comment_discarded', __( 'Comment discarded.', 'akismet' ) );
 273                  } else if ( 'xml-rpc' === $context ) {
 274                      // If this is a pingback that we're pre-checking, the discard behavior is the same as the normal spam response behavior.
 275                      return $commentdata;
 276                  } else {
 277                      // Redirect back to the previous page, or failing that, the post permalink, or failing that, the homepage of the blog.
 278                      $redirect_to = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : ( $post ? get_permalink( $post ) : home_url() );
 279                      wp_safe_redirect( esc_url_raw( $redirect_to ) );
 280                      die();
 281                  }
 282              }
 283              else if ( 'rest_api' === $context ) {
 284                  // The way the REST API structures its calls, we can set the comment_approved value right away.
 285                  $commentdata['comment_approved'] = 'spam';
 286              }
 287          }
 288          
 289          // if the response is neither true nor false, hold the comment for moderation and schedule a recheck
 290          if ( 'true' != $response[1] && 'false' != $response[1] ) {
 291              if ( !current_user_can('moderate_comments') ) {
 292                  // Comment status should be moderated
 293                  self::$last_comment_result = '0';
 294              }
 295  
 296              if ( ! wp_next_scheduled( 'akismet_schedule_cron_recheck' ) ) {
 297                  wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 298                  do_action( 'akismet_scheduled_recheck', 'invalid-response-' . $response[1] );
 299              }
 300  
 301              self::$prevent_moderation_email_for_these_comments[] = $commentdata;
 302          }
 303  
 304          // Delete old comments daily
 305          if ( ! wp_next_scheduled( 'akismet_scheduled_delete' ) ) {
 306              wp_schedule_event( time(), 'daily', 'akismet_scheduled_delete' );
 307          }
 308  
 309          self::set_last_comment( $commentdata );
 310          self::fix_scheduled_recheck();
 311  
 312          return $commentdata;
 313      }
 314      
 315  	public static function get_last_comment() {
 316          return self::$last_comment;
 317      }
 318      
 319  	public static function set_last_comment( $comment ) {
 320          if ( is_null( $comment ) ) {
 321              self::$last_comment = null;
 322          }
 323          else {
 324              // We filter it here so that it matches the filtered comment data that we'll have to compare against later.
 325              // wp_filter_comment expects comment_author_IP
 326              self::$last_comment = wp_filter_comment(
 327                  array_merge(
 328                      array( 'comment_author_IP' => self::get_ip_address() ),
 329                      $comment
 330                  )
 331              );
 332          }
 333      }
 334  
 335      // this fires on wp_insert_comment.  we can't update comment_meta when auto_check_comment() runs
 336      // because we don't know the comment ID at that point.
 337  	public static function auto_check_update_meta( $id, $comment ) {
 338          // wp_insert_comment() might be called in other contexts, so make sure this is the same comment
 339          // as was checked by auto_check_comment
 340          if ( is_object( $comment ) && !empty( self::$last_comment ) && is_array( self::$last_comment ) ) {
 341              if ( self::matches_last_comment( $comment ) ) {
 342                  load_plugin_textdomain( 'akismet' );
 343  
 344                  // normal result: true or false
 345                  if ( self::$last_comment['akismet_result'] == 'true' ) {
 346                      update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
 347                      self::update_comment_history( $comment->comment_ID, '', 'check-spam' );
 348                      if ( $comment->comment_approved != 'spam' ) {
 349                          self::update_comment_history(
 350                              $comment->comment_ID,
 351                              '',
 352                              'status-changed-' . $comment->comment_approved
 353                          );
 354                      }
 355                  } elseif ( self::$last_comment['akismet_result'] == 'false' ) {
 356                      update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
 357                      self::update_comment_history( $comment->comment_ID, '', 'check-ham' );
 358                      // Status could be spam or trash, depending on the WP version and whether this change applies:
 359                      // https://core.trac.wordpress.org/changeset/34726
 360                      if ( $comment->comment_approved == 'spam' || $comment->comment_approved == 'trash' ) {
 361                          if ( function_exists( 'wp_check_comment_disallowed_list' ) ) {
 362                              if ( wp_check_comment_disallowed_list( $comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent ) ) {
 363                                  self::update_comment_history( $comment->comment_ID, '', 'wp-disallowed' );
 364                              } else {
 365                                  self::update_comment_history( $comment->comment_ID, '', 'status-changed-' . $comment->comment_approved );
 366                              }
 367                          } else if ( function_exists( 'wp_blacklist_check' ) && wp_blacklist_check( $comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent ) ) {
 368                              self::update_comment_history( $comment->comment_ID, '', 'wp-blacklisted' );
 369                          } else {
 370                              self::update_comment_history( $comment->comment_ID, '', 'status-changed-' . $comment->comment_approved );
 371                          }
 372                      }
 373                  } else {
 374                       // abnormal result: error
 375                      update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
 376                      self::update_comment_history(
 377                          $comment->comment_ID,
 378                          '',
 379                          'check-error',
 380                          array( 'response' => substr( self::$last_comment['akismet_result'], 0, 50 ) )
 381                      );
 382                  }
 383  
 384                  // record the complete original data as submitted for checking
 385                  if ( isset( self::$last_comment['comment_as_submitted'] ) ) {
 386                      update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', self::$last_comment['comment_as_submitted'] );
 387                  }
 388  
 389                  if ( isset( self::$last_comment['akismet_pro_tip'] ) ) {
 390                      update_comment_meta( $comment->comment_ID, 'akismet_pro_tip', self::$last_comment['akismet_pro_tip'] );
 391                  }
 392              }
 393          }
 394      }
 395  
 396  	public static function delete_old_comments() {
 397          global $wpdb;
 398  
 399          /**
 400           * Determines how many comments will be deleted in each batch.
 401           *
 402           * @param int The default, as defined by AKISMET_DELETE_LIMIT.
 403           */
 404          $delete_limit = apply_filters( 'akismet_delete_comment_limit', defined( 'AKISMET_DELETE_LIMIT' ) ? AKISMET_DELETE_LIMIT : 10000 );
 405          $delete_limit = max( 1, intval( $delete_limit ) );
 406  
 407          /**
 408           * Determines how many days a comment will be left in the Spam queue before being deleted.
 409           *
 410           * @param int The default number of days.
 411           */
 412          $delete_interval = apply_filters( 'akismet_delete_comment_interval', 15 );
 413          $delete_interval = max( 1, intval( $delete_interval ) );
 414  
 415          while ( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_id FROM {$wpdb->comments} WHERE DATE_SUB(NOW(), INTERVAL %d DAY) > comment_date_gmt AND comment_approved = 'spam' LIMIT %d", $delete_interval, $delete_limit ) ) ) {
 416              if ( empty( $comment_ids ) )
 417                  return;
 418  
 419              $wpdb->queries = array();
 420  
 421              $comments = array();
 422  
 423              foreach ( $comment_ids as $comment_id ) {
 424                  $comments[ $comment_id ] = get_comment( $comment_id );
 425  
 426                  do_action( 'delete_comment', $comment_id, $comments[ $comment_id ] );
 427                  do_action( 'akismet_batch_delete_count', __FUNCTION__ );
 428              }
 429  
 430              // Prepared as strings since comment_id is an unsigned BIGINT, and using %d will constrain the value to the maximum signed BIGINT.
 431              $format_string = implode( ", ", array_fill( 0, count( $comment_ids ), '%s' ) );
 432  
 433              $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->comments} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) );
 434              $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) );
 435  
 436              foreach ( $comment_ids as $comment_id ) {
 437                  do_action( 'deleted_comment', $comment_id, $comments[ $comment_id ] );
 438                  unset( $comments[ $comment_id ] );
 439              }
 440  
 441              clean_comment_cache( $comment_ids );
 442              do_action( 'akismet_delete_comment_batch', count( $comment_ids ) );
 443          }
 444  
 445          if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number
 446              $wpdb->query("OPTIMIZE TABLE {$wpdb->comments}");
 447      }
 448  
 449  	public static function delete_old_comments_meta() {
 450          global $wpdb;
 451  
 452          $interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );
 453  
 454          # enforce a minimum of 1 day
 455          $interval = absint( $interval );
 456          if ( $interval < 1 )
 457              $interval = 1;
 458  
 459          // akismet_as_submitted meta values are large, so expire them
 460          // after $interval days regardless of the comment status
 461          while ( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT m.comment_id FROM {$wpdb->commentmeta} as m INNER JOIN {$wpdb->comments} as c USING(comment_id) WHERE m.meta_key = 'akismet_as_submitted' AND DATE_SUB(NOW(), INTERVAL %d DAY) > c.comment_date_gmt LIMIT 10000", $interval ) ) ) {
 462              if ( empty( $comment_ids ) )
 463                  return;
 464  
 465              $wpdb->queries = array();
 466  
 467              foreach ( $comment_ids as $comment_id ) {
 468                  delete_comment_meta( $comment_id, 'akismet_as_submitted' );
 469                  do_action( 'akismet_batch_delete_count', __FUNCTION__ );
 470              }
 471  
 472              do_action( 'akismet_delete_commentmeta_batch', count( $comment_ids ) );
 473          }
 474  
 475          if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number
 476              $wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");
 477      }
 478  
 479      // Clear out comments meta that no longer have corresponding comments in the database
 480  	public static function delete_orphaned_commentmeta() {
 481          global $wpdb;
 482  
 483          $last_meta_id = 0;
 484          $start_time = isset( $_SERVER['REQUEST_TIME_FLOAT'] ) ? $_SERVER['REQUEST_TIME_FLOAT'] : microtime( true );
 485          $max_exec_time = max( ini_get('max_execution_time') - 5, 3 );
 486  
 487          while ( $commentmeta_results = $wpdb->get_results( $wpdb->prepare( "SELECT m.meta_id, m.comment_id, m.meta_key FROM {$wpdb->commentmeta} as m LEFT JOIN {$wpdb->comments} as c USING(comment_id) WHERE c.comment_id IS NULL AND m.meta_id > %d ORDER BY m.meta_id LIMIT 1000", $last_meta_id ) ) ) {
 488              if ( empty( $commentmeta_results ) )
 489                  return;
 490  
 491              $wpdb->queries = array();
 492  
 493              $commentmeta_deleted = 0;
 494  
 495              foreach ( $commentmeta_results as $commentmeta ) {
 496                  if ( 'akismet_' == substr( $commentmeta->meta_key, 0, 8 ) ) {
 497                      delete_comment_meta( $commentmeta->comment_id, $commentmeta->meta_key );
 498                      do_action( 'akismet_batch_delete_count', __FUNCTION__ );
 499                      $commentmeta_deleted++;
 500                  }
 501  
 502                  $last_meta_id = $commentmeta->meta_id;
 503              }
 504  
 505              do_action( 'akismet_delete_commentmeta_batch', $commentmeta_deleted );
 506  
 507              // If we're getting close to max_execution_time, quit for this round.
 508              if ( microtime(true) - $start_time > $max_exec_time )
 509                  return;
 510          }
 511  
 512          if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number
 513              $wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");
 514      }
 515  
 516      // how many approved comments does this author have?
 517  	public static function get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
 518          global $wpdb;
 519  
 520          /**
 521           * Which comment types should be ignored when counting a user's approved comments?
 522           *
 523           * Some plugins add entries to the comments table that are not actual
 524           * comments that could have been checked by Akismet. Allow these comments
 525           * to be excluded from the "approved comment count" query in order to
 526           * avoid artificially inflating the approved comment count.
 527           *
 528           * @param array $comment_types An array of comment types that won't be considered
 529           *                             when counting a user's approved comments.
 530           *
 531           * @since 4.2.2
 532           */
 533          $excluded_comment_types = apply_filters( 'akismet_excluded_comment_types', array() );
 534  
 535          $comment_type_where = '';
 536  
 537          if ( is_array( $excluded_comment_types ) && ! empty( $excluded_comment_types ) ) {
 538              $excluded_comment_types = array_unique( $excluded_comment_types );
 539  
 540              foreach ( $excluded_comment_types as $excluded_comment_type ) {
 541                  $comment_type_where .= $wpdb->prepare( ' AND comment_type <> %s ', $excluded_comment_type );
 542              }
 543          }
 544  
 545          if ( ! empty( $user_id ) ) {
 546              return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE user_id = %d AND comment_approved = 1" . $comment_type_where, $user_id ) );
 547          }
 548  
 549          if ( ! empty( $comment_author_email ) ) {
 550              return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE comment_author_email = %s AND comment_author = %s AND comment_author_url = %s AND comment_approved = 1" . $comment_type_where, $comment_author_email, $comment_author, $comment_author_url ) );
 551          }
 552  
 553          return 0;
 554      }
 555  
 556      // get the full comment history for a given comment, as an array in reverse chronological order
 557  	public static function get_comment_history( $comment_id ) {
 558          $history = get_comment_meta( $comment_id, 'akismet_history', false );
 559          if ( empty( $history ) || empty( $history[ 0 ] ) ) {
 560              return false;
 561          }
 562          
 563          /*
 564          // To see all variants when testing.
 565          $history[] = array( 'time' => 445856401, 'message' => 'Old versions of Akismet stored the message as a literal string in the commentmeta.', 'event' => null );
 566          $history[] = array( 'time' => 445856402, 'event' => 'recheck-spam' );
 567          $history[] = array( 'time' => 445856403, 'event' => 'check-spam' );
 568          $history[] = array( 'time' => 445856404, 'event' => 'recheck-ham' );
 569          $history[] = array( 'time' => 445856405, 'event' => 'check-ham' );
 570          $history[] = array( 'time' => 445856406, 'event' => 'wp-blacklisted' );
 571          $history[] = array( 'time' => 445856406, 'event' => 'wp-disallowed' );
 572          $history[] = array( 'time' => 445856407, 'event' => 'report-spam' );
 573          $history[] = array( 'time' => 445856408, 'event' => 'report-spam', 'user' => 'sam' );
 574          $history[] = array( 'message' => 'sam reported this comment as spam (hardcoded message).', 'time' => 445856400, 'event' => 'report-spam', 'user' => 'sam' );
 575          $history[] = array( 'time' => 445856409, 'event' => 'report-ham', 'user' => 'sam' );
 576          $history[] = array( 'message' => 'sam reported this comment as ham (hardcoded message).', 'time' => 445856400, 'event' => 'report-ham', 'user' => 'sam' ); //
 577          $history[] = array( 'time' => 445856410, 'event' => 'cron-retry-spam' );
 578          $history[] = array( 'time' => 445856411, 'event' => 'cron-retry-ham' );
 579          $history[] = array( 'time' => 445856412, 'event' => 'check-error' ); //
 580          $history[] = array( 'time' => 445856413, 'event' => 'check-error', 'meta' => array( 'response' => 'The server was taking a nap.' ) );
 581          $history[] = array( 'time' => 445856414, 'event' => 'recheck-error' ); // Should not generate a message.
 582          $history[] = array( 'time' => 445856415, 'event' => 'recheck-error', 'meta' => array( 'response' => 'The server was taking a nap.' ) );
 583          $history[] = array( 'time' => 445856416, 'event' => 'status-changedtrash' );
 584          $history[] = array( 'time' => 445856417, 'event' => 'status-changedspam' );
 585          $history[] = array( 'time' => 445856418, 'event' => 'status-changedhold' );
 586          $history[] = array( 'time' => 445856419, 'event' => 'status-changedapprove' );
 587          $history[] = array( 'time' => 445856420, 'event' => 'status-changed-trash' );
 588          $history[] = array( 'time' => 445856421, 'event' => 'status-changed-spam' );
 589          $history[] = array( 'time' => 445856422, 'event' => 'status-changed-hold' );
 590          $history[] = array( 'time' => 445856423, 'event' => 'status-changed-approve' );
 591          $history[] = array( 'time' => 445856424, 'event' => 'status-trash', 'user' => 'sam' );
 592          $history[] = array( 'time' => 445856425, 'event' => 'status-spam', 'user' => 'sam' );
 593          $history[] = array( 'time' => 445856426, 'event' => 'status-hold', 'user' => 'sam' );
 594          $history[] = array( 'time' => 445856427, 'event' => 'status-approve', 'user' => 'sam' );
 595          */
 596          
 597          usort( $history, array( 'Akismet', '_cmp_time' ) );
 598          return $history;
 599      }
 600  
 601      /**
 602       * Log an event for a given comment, storing it in comment_meta.
 603       *
 604       * @param int $comment_id The ID of the relevant comment.
 605       * @param string $message The string description of the event. No longer used.
 606       * @param string $event The event code.
 607       * @param array $meta Metadata about the history entry. e.g., the user that reported or changed the status of a given comment.
 608       */
 609  	public static function update_comment_history( $comment_id, $message, $event=null, $meta=null ) {
 610          global $current_user;
 611  
 612          $user = '';
 613  
 614          $event = array(
 615              'time'    => self::_get_microtime(),
 616              'event'   => $event,
 617          );
 618          
 619          if ( is_object( $current_user ) && isset( $current_user->user_login ) ) {
 620              $event['user'] = $current_user->user_login;
 621          }
 622          
 623          if ( ! empty( $meta ) ) {
 624              $event['meta'] = $meta;
 625          }
 626  
 627          // $unique = false so as to allow multiple values per comment
 628          $r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
 629      }
 630  
 631  	public static function check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
 632          global $wpdb;
 633  
 634          if ( ! self::get_api_key() ) {
 635              return new WP_Error( 'akismet-not-configured', __( 'Akismet is not configured. Please enter an API key.', 'akismet' ) );
 636          }
 637  
 638          $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $id ), ARRAY_A );
 639          
 640          if ( ! $c ) {
 641              return new WP_Error( 'invalid-comment-id', __( 'Comment not found.', 'akismet' ) );
 642          }
 643  
 644          $c['user_ip']        = $c['comment_author_IP'];
 645          $c['user_agent']     = $c['comment_agent'];
 646          $c['referrer']       = '';
 647          $c['blog']           = get_option( 'home' );
 648          $c['blog_lang']      = get_locale();
 649          $c['blog_charset']   = get_option('blog_charset');
 650          $c['permalink']      = get_permalink($c['comment_post_ID']);
 651          $c['recheck_reason'] = $recheck_reason;
 652  
 653          $c['user_role'] = '';
 654          if ( ! empty( $c['user_ID'] ) ) {
 655              $c['user_role'] = Akismet::get_user_roles( $c['user_ID'] );
 656          }
 657  
 658          if ( self::is_test_mode() )
 659              $c['is_test'] = 'true';
 660  
 661          $response = self::http_post( Akismet::build_query( $c ), 'comment-check' );
 662  
 663          if ( ! empty( $response[1] ) ) {
 664              return $response[1];
 665          }
 666  
 667          return false;
 668      }
 669      
 670  	public static function recheck_comment( $id, $recheck_reason = 'recheck_queue' ) {
 671          add_comment_meta( $id, 'akismet_rechecking', true );
 672          
 673          $api_response = self::check_db_comment( $id, $recheck_reason );
 674  
 675          delete_comment_meta( $id, 'akismet_rechecking' );
 676  
 677          if ( is_wp_error( $api_response ) ) {
 678              // Invalid comment ID.
 679          }
 680          else if ( 'true' === $api_response ) {
 681              wp_set_comment_status( $id, 'spam' );
 682              update_comment_meta( $id, 'akismet_result', 'true' );
 683              delete_comment_meta( $id, 'akismet_error' );
 684              delete_comment_meta( $id, 'akismet_delayed_moderation_email' );
 685              Akismet::update_comment_history( $id, '', 'recheck-spam' );
 686          }
 687          elseif ( 'false' === $api_response ) {
 688              update_comment_meta( $id, 'akismet_result', 'false' );
 689              delete_comment_meta( $id, 'akismet_error' );
 690              delete_comment_meta( $id, 'akismet_delayed_moderation_email' );
 691              Akismet::update_comment_history( $id, '', 'recheck-ham' );
 692          }
 693          else {
 694              // abnormal result: error
 695              update_comment_meta( $id, 'akismet_result', 'error' );
 696              Akismet::update_comment_history(
 697                  $id,
 698                  '',
 699                  'recheck-error',
 700                  array( 'response' => substr( $api_response, 0, 50 ) )
 701              );
 702          }
 703  
 704          return $api_response;
 705      }
 706  
 707  	public static function transition_comment_status( $new_status, $old_status, $comment ) {
 708          
 709          if ( $new_status == $old_status )
 710              return;
 711  
 712          if ( 'spam' === $new_status || 'spam' === $old_status ) {
 713              // Clear the cache of the "X comments in your spam queue" count on the dashboard.
 714              wp_cache_delete( 'akismet_spam_count', 'widget' );
 715          }
 716  
 717          # we don't need to record a history item for deleted comments
 718          if ( $new_status == 'delete' )
 719              return;
 720          
 721          if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) && !current_user_can( 'moderate_comments' ) )
 722              return;
 723  
 724          if ( defined('WP_IMPORTING') && WP_IMPORTING == true )
 725              return;
 726              
 727          // if this is present, it means the status has been changed by a re-check, not an explicit user action
 728          if ( get_comment_meta( $comment->comment_ID, 'akismet_rechecking' ) )
 729              return;
 730          
 731          // Assumption alert:
 732          // We want to submit comments to Akismet only when a moderator explicitly spams or approves it - not if the status
 733          // is changed automatically by another plugin.  Unfortunately WordPress doesn't provide an unambiguous way to
 734          // determine why the transition_comment_status action was triggered.  And there are several different ways by which
 735          // to spam and unspam comments: bulk actions, ajax, links in moderation emails, the dashboard, and perhaps others.
 736          // We'll assume that this is an explicit user action if certain POST/GET variables exist.
 737          if (
 738               // status=spam: Marking as spam via the REST API or...
 739               // status=unspam: I'm not sure. Maybe this used to be used instead of status=approved? Or the UI for removing from spam but not approving has been since removed?...
 740               // status=approved: Unspamming via the REST API (Calypso) or...
 741               ( isset( $_POST['status'] ) && in_array( $_POST['status'], array( 'spam', 'unspam', 'approved', ) ) )
 742               // spam=1: Clicking "Spam" underneath a comment in wp-admin and allowing the AJAX request to happen.
 743               || ( isset( $_POST['spam'] ) && (int) $_POST['spam'] == 1 )
 744               // unspam=1: Clicking "Not Spam" underneath a comment in wp-admin and allowing the AJAX request to happen. Or, clicking "Undo" after marking something as spam.
 745               || ( isset( $_POST['unspam'] ) && (int) $_POST['unspam'] == 1 )
 746               // comment_status=spam/unspam: It's unclear where this is happening.
 747               || ( isset( $_POST['comment_status'] )  && in_array( $_POST['comment_status'], array( 'spam', 'unspam' ) ) )
 748               // action=spam: Choosing "Mark as Spam" from the Bulk Actions dropdown in wp-admin (or the "Spam it" link in notification emails).
 749               // action=unspam: Choosing "Not Spam" from the Bulk Actions dropdown in wp-admin.
 750               // action=spamcomment: Following the "Spam" link below a comment in wp-admin (not allowing AJAX request to happen).
 751               // action=unspamcomment: Following the "Not Spam" link below a comment in wp-admin (not allowing AJAX request to happen).
 752               || ( isset( $_GET['action'] ) && in_array( $_GET['action'], array( 'spam', 'unspam', 'spamcomment', 'unspamcomment', ) ) )
 753               // action=editedcomment: Editing a comment via wp-admin (and possibly changing its status).
 754               || ( isset( $_POST['action'] ) && in_array( $_POST['action'], array( 'editedcomment' ) ) )
 755               // for=jetpack: Moderation via the WordPress app, Calypso, anything powered by the Jetpack connection.
 756               || ( isset( $_GET['for'] ) && ( 'jetpack' == $_GET['for'] ) && ( ! defined( 'IS_WPCOM' ) || ! IS_WPCOM ) ) 
 757               // Certain WordPress.com API requests
 758               || ( defined( 'REST_API_REQUEST' ) && REST_API_REQUEST )
 759               // WordPress.org REST API requests
 760               || ( defined( 'REST_REQUEST' ) && REST_REQUEST )
 761           ) {
 762              if ( $new_status == 'spam' && ( $old_status == 'approved' || $old_status == 'unapproved' || !$old_status ) ) {
 763                  return self::submit_spam_comment( $comment->comment_ID );
 764              } elseif ( $old_status == 'spam' && ( $new_status == 'approved' || $new_status == 'unapproved' ) ) {
 765                  return self::submit_nonspam_comment( $comment->comment_ID );
 766              }
 767          }
 768  
 769          self::update_comment_history( $comment->comment_ID, '', 'status-' . $new_status );
 770      }
 771      
 772  	public static function submit_spam_comment( $comment_id ) {
 773          global $wpdb, $current_user, $current_site;
 774  
 775          $comment_id = (int) $comment_id;
 776  
 777          $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
 778  
 779          if ( !$comment ) // it was deleted
 780              return;
 781  
 782          if ( 'spam' != $comment->comment_approved )
 783              return;
 784  
 785          self::update_comment_history( $comment_id, '', 'report-spam' );
 786  
 787          // If the user hasn't configured Akismet, there's nothing else to do at this point.
 788          if ( ! self::get_api_key() ) {
 789              return;
 790          }
 791  
 792          // use the original version stored in comment_meta if available
 793          $as_submitted = self::sanitize_comment_as_submitted( get_comment_meta( $comment_id, 'akismet_as_submitted', true ) );
 794  
 795          if ( $as_submitted && is_array( $as_submitted ) && isset( $as_submitted['comment_content'] ) )
 796              $comment = (object) array_merge( (array)$comment, $as_submitted );
 797  
 798          $comment->blog         = get_option( 'home' );
 799          $comment->blog_lang    = get_locale();
 800          $comment->blog_charset = get_option('blog_charset');
 801          $comment->permalink    = get_permalink($comment->comment_post_ID);
 802  
 803          if ( is_object($current_user) )
 804              $comment->reporter = $current_user->user_login;
 805  
 806          if ( is_object($current_site) )
 807              $comment->site_domain = $current_site->domain;
 808  
 809          $comment->user_role = '';
 810          if ( ! empty( $comment->user_ID ) ) {
 811              $comment->user_role = Akismet::get_user_roles( $comment->user_ID );
 812          }
 813  
 814          if ( self::is_test_mode() )
 815              $comment->is_test = 'true';
 816  
 817          $post = get_post( $comment->comment_post_ID );
 818  
 819          if ( ! is_null( $post ) ) {
 820              $comment->comment_post_modified_gmt = $post->post_modified_gmt;
 821          }
 822  
 823          $response = Akismet::http_post( Akismet::build_query( $comment ), 'submit-spam' );
 824  
 825          update_comment_meta( $comment_id, 'akismet_user_result', 'true' );
 826  
 827          if ( $comment->reporter ) {
 828              update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
 829          }
 830  
 831          do_action('akismet_submit_spam_comment', $comment_id, $response[1]);
 832      }
 833  
 834  	public static function submit_nonspam_comment( $comment_id ) {
 835          global $wpdb, $current_user, $current_site;
 836  
 837          $comment_id = (int) $comment_id;
 838  
 839          $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
 840          if ( !$comment ) // it was deleted
 841              return;
 842  
 843          self::update_comment_history( $comment_id, '', 'report-ham' );
 844  
 845          // If the user hasn't configured Akismet, there's nothing else to do at this point.
 846          if ( ! self::get_api_key() ) {
 847              return;
 848          }
 849  
 850          // use the original version stored in comment_meta if available
 851          $as_submitted = self::sanitize_comment_as_submitted( get_comment_meta( $comment_id, 'akismet_as_submitted', true ) );
 852  
 853          if ( $as_submitted && is_array($as_submitted) && isset($as_submitted['comment_content']) )
 854              $comment = (object) array_merge( (array)$comment, $as_submitted );
 855  
 856          $comment->blog         = get_option( 'home' );
 857          $comment->blog_lang    = get_locale();
 858          $comment->blog_charset = get_option('blog_charset');
 859          $comment->permalink    = get_permalink( $comment->comment_post_ID );
 860          $comment->user_role    = '';
 861  
 862          if ( is_object($current_user) )
 863              $comment->reporter = $current_user->user_login;
 864  
 865          if ( is_object($current_site) )
 866              $comment->site_domain = $current_site->domain;
 867  
 868          if ( ! empty( $comment->user_ID ) ) {
 869              $comment->user_role = Akismet::get_user_roles( $comment->user_ID );
 870          }
 871  
 872          if ( Akismet::is_test_mode() )
 873              $comment->is_test = 'true';
 874  
 875          $post = get_post( $comment->comment_post_ID );
 876  
 877          if ( ! is_null( $post ) ) {
 878              $comment->comment_post_modified_gmt = $post->post_modified_gmt;
 879          }
 880  
 881          $response = self::http_post( Akismet::build_query( $comment ), 'submit-ham' );
 882  
 883          update_comment_meta( $comment_id, 'akismet_user_result', 'false' );
 884  
 885          if ( $comment->reporter ) {
 886              update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
 887          }
 888  
 889          do_action('akismet_submit_nonspam_comment', $comment_id, $response[1]);
 890      }
 891  
 892  	public static function cron_recheck() {
 893          global $wpdb;
 894  
 895          $api_key = self::get_api_key();
 896  
 897          $status = self::verify_key( $api_key );
 898          if ( get_option( 'akismet_alert_code' ) || $status == 'invalid' ) {
 899              // since there is currently a problem with the key, reschedule a check for 6 hours hence
 900              wp_schedule_single_event( time() + 21600, 'akismet_schedule_cron_recheck' );
 901              do_action( 'akismet_scheduled_recheck', 'key-problem-' . get_option( 'akismet_alert_code' ) . '-' . $status );
 902              return false;
 903          }
 904  
 905          delete_option('akismet_available_servers');
 906  
 907          $comment_errors = $wpdb->get_col( "SELECT comment_id FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error'    LIMIT 100" );
 908          
 909          load_plugin_textdomain( 'akismet' );
 910  
 911          foreach ( (array) $comment_errors as $comment_id ) {
 912              // if the comment no longer exists, or is too old, remove the meta entry from the queue to avoid getting stuck
 913              $comment = get_comment( $comment_id );
 914  
 915              if (
 916                  ! $comment // Comment has been deleted
 917                  || strtotime( $comment->comment_date_gmt ) < strtotime( "-15 days" ) // Comment is too old.
 918                  || $comment->comment_approved !== "0" // Comment is no longer in the Pending queue
 919                  ) {
 920                  delete_comment_meta( $comment_id, 'akismet_error' );
 921                  delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 922                  continue;
 923              }
 924  
 925              add_comment_meta( $comment_id, 'akismet_rechecking', true );
 926              $status = self::check_db_comment( $comment_id, 'retry' );
 927  
 928              $event = '';
 929              if ( $status == 'true' ) {
 930                  $event = 'cron-retry-spam';
 931              } elseif ( $status == 'false' ) {
 932                  $event = 'cron-retry-ham';
 933              }
 934  
 935              // If we got back a legit response then update the comment history
 936              // other wise just bail now and try again later.  No point in
 937              // re-trying all the comments once we hit one failure.
 938              if ( !empty( $event ) ) {
 939                  delete_comment_meta( $comment_id, 'akismet_error' );
 940                  self::update_comment_history( $comment_id, '', $event );
 941                  update_comment_meta( $comment_id, 'akismet_result', $status );
 942                  // make sure the comment status is still pending.  if it isn't, that means the user has already moved it elsewhere.
 943                  $comment = get_comment( $comment_id );
 944                  if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
 945                      if ( $status == 'true' ) {
 946                          wp_spam_comment( $comment_id );
 947                      } elseif ( $status == 'false' ) {
 948                          // comment is good, but it's still in the pending queue.  depending on the moderation settings
 949                          // we may need to change it to approved.
 950                          if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
 951                              wp_set_comment_status( $comment_id, 1 );
 952                          else if ( get_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true ) )
 953                              wp_notify_moderator( $comment_id );
 954                      }
 955                  }
 956                  
 957                  delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 958              } else {
 959                  // If this comment has been pending moderation for longer than MAX_DELAY_BEFORE_MODERATION_EMAIL,
 960                  // send a moderation email now.
 961                  if ( ( intval( gmdate( 'U' ) ) - strtotime( $comment->comment_date_gmt ) ) < self::MAX_DELAY_BEFORE_MODERATION_EMAIL ) {
 962                      delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 963                      wp_notify_moderator( $comment_id );
 964                  }
 965  
 966                  delete_comment_meta( $comment_id, 'akismet_rechecking' );
 967                  wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 968                  do_action( 'akismet_scheduled_recheck', 'check-db-comment-' . $status );
 969                  return;
 970              }
 971              delete_comment_meta( $comment_id, 'akismet_rechecking' );
 972          }
 973  
 974          $remaining = $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error'" );
 975          if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
 976              wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 977              do_action( 'akismet_scheduled_recheck', 'remaining' );
 978          }
 979      }
 980  
 981  	public static function fix_scheduled_recheck() {
 982          $future_check = wp_next_scheduled( 'akismet_schedule_cron_recheck' );
 983          if ( !$future_check ) {
 984              return;
 985          }
 986  
 987          if ( get_option( 'akismet_alert_code' ) > 0 ) {
 988              return;
 989          }
 990  
 991          $check_range = time() + 1200;
 992          if ( $future_check > $check_range ) {
 993              wp_clear_scheduled_hook( 'akismet_schedule_cron_recheck' );
 994              wp_schedule_single_event( time() + 300, 'akismet_schedule_cron_recheck' );
 995              do_action( 'akismet_scheduled_recheck', 'fix-scheduled-recheck' );
 996          }
 997      }
 998  
 999  	public static function add_comment_nonce( $post_id ) {
1000          /**
1001           * To disable the Akismet comment nonce, add a filter for the 'akismet_comment_nonce' tag
1002           * and return any string value that is not 'true' or '' (empty string).
1003           *
1004           * Don't return boolean false, because that implies that the 'akismet_comment_nonce' option
1005           * has not been set and that Akismet should just choose the default behavior for that
1006           * situation.
1007           */
1008          
1009          if ( ! self::get_api_key() ) {
1010              return;
1011          }
1012          
1013          $akismet_comment_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
1014  
1015          if ( $akismet_comment_nonce_option == 'true' || $akismet_comment_nonce_option == '' ) {
1016              echo '<p style="display: none;">';
1017              wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
1018              echo '</p>';
1019          }
1020      }
1021  
1022  	public static function is_test_mode() {
1023          return defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE;
1024      }
1025      
1026  	public static function allow_discard() {
1027          if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
1028              return false;
1029          if ( is_user_logged_in() )
1030              return false;
1031      
1032          return ( get_option( 'akismet_strictness' ) === '1' );
1033      }
1034  
1035  	public static function get_ip_address() {
1036          return isset( $_SERVER['REMOTE_ADDR'] ) ? $_SERVER['REMOTE_ADDR'] : null;
1037      }
1038      
1039      /**
1040       * Do these two comments, without checking the comment_ID, "match"?
1041       *
1042       * @param mixed $comment1 A comment object or array.
1043       * @param mixed $comment2 A comment object or array.
1044       * @return bool Whether the two comments should be treated as the same comment.
1045       */
1046  	private static function comments_match( $comment1, $comment2 ) {
1047          $comment1 = (array) $comment1;
1048          $comment2 = (array) $comment2;
1049  
1050          // Set default values for these strings that we check in order to simplify
1051          // the checks and avoid PHP warnings.
1052          if ( ! isset( $comment1['comment_author'] ) ) {
1053              $comment1['comment_author'] = '';
1054          }
1055  
1056          if ( ! isset( $comment2['comment_author'] ) ) {
1057              $comment2['comment_author'] = '';
1058          }
1059  
1060          if ( ! isset( $comment1['comment_author_email'] ) ) {
1061              $comment1['comment_author_email'] = '';
1062          }
1063  
1064          if ( ! isset( $comment2['comment_author_email'] ) ) {
1065              $comment2['comment_author_email'] = '';
1066          }
1067  
1068          $comments_match = (
1069                 isset( $comment1['comment_post_ID'], $comment2['comment_post_ID'] )
1070              && intval( $comment1['comment_post_ID'] ) == intval( $comment2['comment_post_ID'] )
1071              && (
1072                  // The comment author length max is 255 characters, limited by the TINYTEXT column type.
1073                  // If the comment author includes multibyte characters right around the 255-byte mark, they
1074                  // may be stripped when the author is saved in the DB, so a 300+ char author may turn into
1075                  // a 253-char author when it's saved, not 255 exactly.  The longest possible character is
1076                  // theoretically 6 bytes, so we'll only look at the first 248 bytes to be safe.
1077                  substr( $comment1['comment_author'], 0, 248 ) == substr( $comment2['comment_author'], 0, 248 )
1078                  || substr( stripslashes( $comment1['comment_author'] ), 0, 248 ) == substr( $comment2['comment_author'], 0, 248 )
1079                  || substr( $comment1['comment_author'], 0, 248 ) == substr( stripslashes( $comment2['comment_author'] ), 0, 248 )
1080                  // Certain long comment author names will be truncated to nothing, depending on their encoding.
1081                  || ( ! $comment1['comment_author'] && strlen( $comment2['comment_author'] ) > 248 )
1082                  || ( ! $comment2['comment_author'] && strlen( $comment1['comment_author'] ) > 248 )
1083                  )
1084              && (
1085                  // The email max length is 100 characters, limited by the VARCHAR(100) column type.
1086                  // Same argument as above for only looking at the first 93 characters.
1087                  substr( $comment1['comment_author_email'], 0, 93 ) == substr( $comment2['comment_author_email'], 0, 93 )
1088                  || substr( stripslashes( $comment1['comment_author_email'] ), 0, 93 ) == substr( $comment2['comment_author_email'], 0, 93 )
1089                  || substr( $comment1['comment_author_email'], 0, 93 ) == substr( stripslashes( $comment2['comment_author_email'] ), 0, 93 )
1090                  // Very long emails can be truncated and then stripped if the [0:100] substring isn't a valid address.
1091                  || ( ! $comment1['comment_author_email'] && strlen( $comment2['comment_author_email'] ) > 100 )
1092                  || ( ! $comment2['comment_author_email'] && strlen( $comment1['comment_author_email'] ) > 100 )
1093              )
1094          );
1095  
1096          return $comments_match;
1097      }
1098      
1099      // Does the supplied comment match the details of the one most recently stored in self::$last_comment?
1100  	public static function matches_last_comment( $comment ) {
1101          return self::comments_match( self::$last_comment, $comment );
1102      }
1103  
1104  	private static function get_user_agent() {
1105          return isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null;
1106      }
1107  
1108  	private static function get_referer() {
1109          return isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : null;
1110      }
1111  
1112      // return a comma-separated list of role names for the given user
1113  	public static function get_user_roles( $user_id ) {
1114          $roles = false;
1115  
1116          if ( !class_exists('WP_User') )
1117              return false;
1118  
1119          if ( $user_id > 0 ) {
1120              $comment_user = new WP_User( $user_id );
1121              if ( isset( $comment_user->roles ) )
1122                  $roles = join( ',', $comment_user->roles );
1123          }
1124  
1125          if ( is_multisite() && is_super_admin( $user_id ) ) {
1126              if ( empty( $roles ) ) {
1127                  $roles = 'super_admin';
1128              } else {
1129                  $comment_user->roles[] = 'super_admin';
1130                  $roles = join( ',', $comment_user->roles );
1131              }
1132          }
1133  
1134          return $roles;
1135      }
1136  
1137      // filter handler used to return a spam result to pre_comment_approved
1138  	public static function last_comment_status( $approved, $comment ) {
1139          if ( is_null( self::$last_comment_result ) ) {
1140              // We didn't have reason to store the result of the last check.
1141              return $approved;
1142          }
1143  
1144          // Only do this if it's the correct comment
1145          if ( ! self::matches_last_comment( $comment ) ) {
1146              self::log( "comment_is_spam mismatched comment, returning unaltered $approved" );
1147              return $approved;
1148          }
1149  
1150          if ( 'trash' === $approved ) {
1151              // If the last comment we checked has had its approval set to 'trash',
1152              // then it failed the comment blacklist check. Let that blacklist override
1153              // the spam check, since users have the (valid) expectation that when
1154              // they fill out their blacklists, comments that match it will always
1155              // end up in the trash.
1156              return $approved;
1157          }
1158  
1159          // bump the counter here instead of when the filter is added to reduce the possibility of overcounting
1160          if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
1161              update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
1162  
1163          return self::$last_comment_result;
1164      }
1165      
1166      /**
1167       * If Akismet is temporarily unreachable, we don't want to "spam" the blogger with
1168       * moderation emails for comments that will be automatically cleared or spammed on
1169       * the next retry.
1170       *
1171       * For comments that will be rechecked later, empty the list of email addresses that
1172       * the moderation email would be sent to.
1173       *
1174       * @param array $emails An array of email addresses that the moderation email will be sent to.
1175       * @param int $comment_id The ID of the relevant comment.
1176       * @return array An array of email addresses that the moderation email will be sent to.
1177       */
1178  	public static function disable_moderation_emails_if_unreachable( $emails, $comment_id ) {
1179          if ( ! empty( self::$prevent_moderation_email_for_these_comments ) && ! empty( $emails ) ) {
1180              $comment = get_comment( $comment_id );
1181  
1182              if ( $comment ) {
1183                  foreach ( self::$prevent_moderation_email_for_these_comments as $possible_match ) {
1184                      if ( self::comments_match( $possible_match, $comment ) ) {
1185                          update_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true );
1186                          return array();
1187                      }
1188                  }
1189              }
1190          }
1191  
1192          return $emails;
1193      }
1194  
1195  	public static function _cmp_time( $a, $b ) {
1196          return $a['time'] > $b['time'] ? -1 : 1;
1197      }
1198  
1199  	public static function _get_microtime() {
1200          $mtime = explode( ' ', microtime() );
1201          return $mtime[1] + $mtime[0];
1202      }
1203  
1204      /**
1205       * Make a POST request to the Akismet API.
1206       *
1207       * @param string $request The body of the request.
1208       * @param string $path The path for the request.
1209       * @param string $ip The specific IP address to hit.
1210       * @return array A two-member array consisting of the headers and the response body, both empty in the case of a failure.
1211       */
1212  	public static function http_post( $request, $path, $ip=null ) {
1213  
1214          $akismet_ua = sprintf( 'WordPress/%s | Akismet/%s', $GLOBALS['wp_version'], constant( 'AKISMET_VERSION' ) );
1215          $akismet_ua = apply_filters( 'akismet_ua', $akismet_ua );
1216  
1217          $content_length = strlen( $request );
1218  
1219          $api_key   = self::get_api_key();
1220          $host      = self::API_HOST;
1221  
1222          if ( !empty( $api_key ) )
1223              $host = $api_key.'.'.$host;
1224  
1225          $http_host = $host;
1226          // use a specific IP if provided
1227          // needed by Akismet_Admin::check_server_connectivity()
1228          if ( $ip && long2ip( ip2long( $ip ) ) ) {
1229              $http_host = $ip;
1230          }
1231  
1232          $http_args = array(
1233              'body' => $request,
1234              'headers' => array(
1235                  'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ),
1236                  'Host' => $host,
1237                  'User-Agent' => $akismet_ua,
1238              ),
1239              'httpversion' => '1.0',
1240              'timeout' => 15
1241          );
1242  
1243          $akismet_url = $http_akismet_url = "http://{$http_host}/1.1/{$path}";
1244  
1245          /**
1246           * Try SSL first; if that fails, try without it and don't try it again for a while.
1247           */
1248  
1249          $ssl = $ssl_failed = false;
1250  
1251          // Check if SSL requests were disabled fewer than X hours ago.
1252          $ssl_disabled = get_option( 'akismet_ssl_disabled' );
1253  
1254          if ( $ssl_disabled && $ssl_disabled < ( time() - 60 * 60 * 24 ) ) { // 24 hours
1255              $ssl_disabled = false;
1256              delete_option( 'akismet_ssl_disabled' );
1257          }
1258          else if ( $ssl_disabled ) {
1259              do_action( 'akismet_ssl_disabled' );
1260          }
1261  
1262          if ( ! $ssl_disabled && ( $ssl = wp_http_supports( array( 'ssl' ) ) ) ) {
1263              $akismet_url = set_url_scheme( $akismet_url, 'https' );
1264  
1265              do_action( 'akismet_https_request_pre' );
1266          }
1267  
1268          $response = wp_remote_post( $akismet_url, $http_args );
1269  
1270          Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
1271  
1272          if ( $ssl && is_wp_error( $response ) ) {
1273              do_action( 'akismet_https_request_failure', $response );
1274  
1275              // Intermittent connection problems may cause the first HTTPS
1276              // request to fail and subsequent HTTP requests to succeed randomly.
1277              // Retry the HTTPS request once before disabling SSL for a time.
1278              $response = wp_remote_post( $akismet_url, $http_args );
1279              
1280              Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
1281  
1282              if ( is_wp_error( $response ) ) {
1283                  $ssl_failed = true;
1284  
1285                  do_action( 'akismet_https_request_failure', $response );
1286  
1287                  do_action( 'akismet_http_request_pre' );
1288  
1289                  // Try the request again without SSL.
1290                  $response = wp_remote_post( $http_akismet_url, $http_args );
1291  
1292                  Akismet::log( compact( 'http_akismet_url', 'http_args', 'response' ) );
1293              }
1294          }
1295  
1296          if ( is_wp_error( $response ) ) {
1297              do_action( 'akismet_request_failure', $response );
1298  
1299              return array( '', '' );
1300          }
1301  
1302          if ( $ssl_failed ) {
1303              // The request failed when using SSL but succeeded without it. Disable SSL for future requests.
1304              update_option( 'akismet_ssl_disabled', time() );
1305              
1306              do_action( 'akismet_https_disabled' );
1307          }
1308          
1309          $simplified_response = array( $response['headers'], $response['body'] );
1310          
1311          self::update_alert( $simplified_response );
1312  
1313          return $simplified_response;
1314      }
1315  
1316      // given a response from an API call like check_key_status(), update the alert code options if an alert is present.
1317  	public static function update_alert( $response ) {
1318          $alert_option_prefix = 'akismet_alert_';
1319          $alert_header_prefix = 'x-akismet-alert-';
1320          $alert_header_names  = array(
1321              'code',
1322              'msg',
1323              'api-calls',
1324              'usage-limit',
1325              'upgrade-plan',
1326              'upgrade-url',
1327              'upgrade-type',
1328          );
1329  
1330          foreach ( $alert_header_names as $alert_header_name ) {
1331              $value = null;
1332              if ( isset( $response[0][ $alert_header_prefix . $alert_header_name ] ) ) {
1333                  $value = $response[0][ $alert_header_prefix . $alert_header_name ];
1334              }
1335  
1336              $option_name = $alert_option_prefix . str_replace( '-', '_', $alert_header_name );
1337              if ( $value != get_option( $option_name ) ) {
1338                  if ( ! $value ) {
1339                      delete_option( $option_name );
1340                  } else {
1341                      update_option( $option_name, $value );
1342                  }
1343              }
1344          }
1345      }
1346  
1347  	public static function load_form_js() {
1348          /* deprecated */
1349      }
1350  
1351  	public static function set_form_js_async( $tag, $handle, $src ) {
1352          /* deprecated */
1353          return $tag;
1354      }
1355  
1356  	public static function get_akismet_form_fields() {
1357          $fields = '';
1358  
1359          $prefix = 'ak_';
1360  
1361          // Contact Form 7 uses _wpcf7 as a prefix to know which fields to exclude from comment_content.
1362          if ( 'wpcf7_form_elements' === current_filter() ) {
1363              $prefix = '_wpcf7_ak_';
1364          }
1365  
1366          $fields .= '<p style="display: none !important;">';
1367          $fields .= '<label>&#916;<textarea name="' . $prefix . 'hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label>';
1368  
1369          if ( ! function_exists( 'amp_is_request' ) || ! amp_is_request() ) {
1370              // Keep track of how many ak_js fields are in this page so that we don't re-use
1371              // the same ID.
1372              static $field_count = 0;
1373  
1374              $field_count++;
1375  
1376              $fields .= '<input type="hidden" id="ak_js_' . $field_count . '" name="' . $prefix . 'js" value="' . mt_rand( 0, 250 ) . '"/>';
1377              $fields .= '<script>document.getElementById( "ak_js_' . $field_count . '" ).setAttribute( "value", ( new Date() ).getTime() );</script>';
1378          }
1379  
1380          $fields .= '</p>';
1381  
1382          return $fields;
1383      }
1384  
1385  	public static function output_custom_form_fields( $post_id ) {
1386          // phpcs:ignore WordPress.Security.EscapeOutput
1387          echo self::get_akismet_form_fields();
1388      }
1389  
1390  	public static function inject_custom_form_fields( $html ) {
1391          $html = str_replace( '</form>', self::get_akismet_form_fields() . '</form>', $html );
1392  
1393          return $html;
1394      }
1395  
1396  	public static function append_custom_form_fields( $html ) {
1397          $html .= self::get_akismet_form_fields();
1398  
1399          return $html;
1400      }
1401  
1402      /**
1403       * Ensure that any Akismet-added form fields are included in the comment-check call.
1404       *
1405       * @param array $form
1406       * @param array $data Some plugins will supply the POST data via the filter, since they don't
1407       *                    read it directly from $_POST.
1408       * @return array $form
1409       */
1410  	public static function prepare_custom_form_values( $form, $data = null ) {
1411          if ( is_null( $data ) ) {
1412              // phpcs:ignore WordPress.Security.NonceVerification.Missing
1413              $data = $_POST;
1414          }
1415  
1416          $prefix = 'ak_';
1417  
1418          // Contact Form 7 uses _wpcf7 as a prefix to know which fields to exclude from comment_content.
1419          if ( 'wpcf7_akismet_parameters' === current_filter() ) {
1420              $prefix = '_wpcf7_ak_';
1421          }
1422  
1423          foreach ( $data as $key => $val ) {
1424              if ( 0 === strpos( $key, $prefix ) ) {
1425                  $form[ 'POST_ak_' . substr( $key, strlen( $prefix ) ) ] = $val;
1426              }
1427          }
1428  
1429          return $form;
1430      }
1431  
1432  	private static function bail_on_activation( $message, $deactivate = true ) {
1433  ?>
1434  <!doctype html>
1435  <html>
1436  <head>
1437  <meta charset="<?php bloginfo( 'charset' ); ?>" />
1438  <style>
1439  * {
1440      text-align: center;
1441      margin: 0;
1442      padding: 0;
1443      font-family: "Lucida Grande",Verdana,Arial,"Bitstream Vera Sans",sans-serif;
1444  }
1445  p {
1446      margin-top: 1em;
1447      font-size: 18px;
1448  }
1449  </style>
1450  </head>
1451  <body>
1452  <p><?php echo esc_html( $message ); ?></p>
1453  </body>
1454  </html>
1455  <?php
1456          if ( $deactivate ) {
1457              $plugins = get_option( 'active_plugins' );
1458              $akismet = plugin_basename( AKISMET__PLUGIN_DIR . 'akismet.php' );
1459              $update  = false;
1460              foreach ( $plugins as $i => $plugin ) {
1461                  if ( $plugin === $akismet ) {
1462                      $plugins[$i] = false;
1463                      $update = true;
1464                  }
1465              }
1466  
1467              if ( $update ) {
1468                  update_option( 'active_plugins', array_filter( $plugins ) );
1469              }
1470          }
1471          exit;
1472      }
1473  
1474  	public static function view( $name, array $args = array() ) {
1475          $args = apply_filters( 'akismet_view_arguments', $args, $name );
1476          
1477          foreach ( $args AS $key => $val ) {
1478              $$key = $val;
1479          }
1480          
1481          load_plugin_textdomain( 'akismet' );
1482  
1483          $file = AKISMET__PLUGIN_DIR . 'views/'. $name . '.php';
1484  
1485          include( $file );
1486      }
1487  
1488      /**
1489       * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
1490       * @static
1491       */
1492  	public static function plugin_activation() {
1493          if ( version_compare( $GLOBALS['wp_version'], AKISMET__MINIMUM_WP_VERSION, '<' ) ) {
1494              load_plugin_textdomain( 'akismet' );
1495              
1496              $message = '<strong>'.sprintf(esc_html__( 'Akismet %s requires WordPress %s or higher.' , 'akismet'), AKISMET_VERSION, AKISMET__MINIMUM_WP_VERSION ).'</strong> '.sprintf(__('Please <a href="%1$s">upgrade WordPress</a> to a current version, or <a href="%2$s">downgrade to version 2.4 of the Akismet plugin</a>.', 'akismet'), 'https://codex.wordpress.org/Upgrading_WordPress', 'https://wordpress.org/extend/plugins/akismet/download/');
1497  
1498              Akismet::bail_on_activation( $message );
1499          } elseif ( ! empty( $_SERVER['SCRIPT_NAME'] ) && false !== strpos( $_SERVER['SCRIPT_NAME'], '/wp-admin/plugins.php' ) ) {
1500              add_option( 'Activated_Akismet', true );
1501          }
1502      }
1503  
1504      /**
1505       * Removes all connection options
1506       * @static
1507       */
1508  	public static function plugin_deactivation( ) {
1509          self::deactivate_key( self::get_api_key() );
1510          
1511          // Remove any scheduled cron jobs.
1512          $akismet_cron_events = array(
1513              'akismet_schedule_cron_recheck',
1514              'akismet_scheduled_delete',
1515          );
1516          
1517          foreach ( $akismet_cron_events as $akismet_cron_event ) {
1518              $timestamp = wp_next_scheduled( $akismet_cron_event );
1519              
1520              if ( $timestamp ) {
1521                  wp_unschedule_event( $timestamp, $akismet_cron_event );
1522              }
1523          }
1524      }
1525      
1526      /**
1527       * Essentially a copy of WP's build_query but one that doesn't expect pre-urlencoded values.
1528       *
1529       * @param array $args An array of key => value pairs
1530       * @return string A string ready for use as a URL query string.
1531       */
1532  	public static function build_query( $args ) {
1533          return _http_build_query( $args, '', '&' );
1534      }
1535  
1536      /**
1537       * Log debugging info to the error log.
1538       *
1539       * Enabled when WP_DEBUG_LOG is enabled (and WP_DEBUG, since according to
1540       * core, "WP_DEBUG_DISPLAY and WP_DEBUG_LOG perform no function unless
1541       * WP_DEBUG is true), but can be disabled via the akismet_debug_log filter.
1542       *
1543       * @param mixed $akismet_debug The data to log.
1544       */
1545  	public static function log( $akismet_debug ) {
1546          if ( apply_filters( 'akismet_debug_log', defined( 'WP_DEBUG' ) && WP_DEBUG && defined( 'WP_DEBUG_LOG' ) && WP_DEBUG_LOG && defined( 'AKISMET_DEBUG' ) && AKISMET_DEBUG ) ) {
1547              error_log( print_r( compact( 'akismet_debug' ), true ) );
1548          }
1549      }
1550  
1551  	public static function pre_check_pingback( $method ) {
1552          if ( $method !== 'pingback.ping' )
1553              return;
1554  
1555          // A lot of this code is tightly coupled with the IXR class because the xmlrpc_call action doesn't pass along any information besides the method name.
1556          // This ticket should hopefully fix that: https://core.trac.wordpress.org/ticket/52524
1557          // Until that happens, when it's a system.multicall, pre_check_pingback will be called once for every internal pingback call.
1558          // Keep track of how many times this function has been called so we know which call to reference in the XML.
1559          static $call_count = 0;
1560  
1561          $call_count++;
1562  
1563          global $wp_xmlrpc_server;
1564  
1565          if ( !is_object( $wp_xmlrpc_server ) )
1566              return false;
1567  
1568          $is_multicall = false;
1569          $multicall_count = 0;
1570  
1571          if ( 'system.multicall' === $wp_xmlrpc_server->message->methodName ) {
1572              $is_multicall = true;
1573  
1574              if ( 0 === $call_count ) {
1575                  // Only pass along the number of entries in the multicall the first time we see it.
1576                  $multicall_count = count( $wp_xmlrpc_server->message->params );
1577              }
1578  
1579              /*
1580               * $wp_xmlrpc_server->message looks like this:
1581               *
1582                  (
1583                      [message] =>
1584                      [messageType] => methodCall
1585                      [faultCode] =>
1586                      [faultString] =>
1587                      [methodName] => system.multicall
1588                      [params] => Array
1589                          (
1590                              [0] => Array
1591                                  (
1592                                      [methodName] => pingback.ping
1593                                      [params] => Array
1594                                          (
1595                                              [0] => http://www.example.net/?p=1 // Site that created the pingback.
1596                                              [1] => https://www.example.com/?p=1 // Post being pingback'd on this site.
1597                                          )
1598                                  )
1599                              [1] => Array
1600                                  (
1601                                      [methodName] => pingback.ping
1602                                      [params] => Array
1603                                          (
1604                                              [0] => http://www.example.net/?p=1 // Site that created the pingback.
1605                                              [1] => https://www.example.com/?p=2 // Post being pingback'd on this site.
1606                                          )
1607                                  )
1608                          )
1609                  )
1610               */
1611  
1612              // Use the params from the nth pingback.ping call in the multicall.
1613              $pingback_calls_found = 0;
1614  
1615              foreach ( $wp_xmlrpc_server->message->params as $xmlrpc_action ) {
1616                  if ( 'pingback.ping' === $xmlrpc_action['methodName'] ) {
1617                      $pingback_calls_found++;
1618                  }
1619  
1620                  if ( $call_count === $pingback_calls_found ) {
1621                      $pingback_args = $xmlrpc_action['params'];
1622                      break;
1623                  }
1624              }
1625          } else {
1626              /*
1627               * $wp_xmlrpc_server->message looks like this:
1628               *
1629                  (
1630                      [message] =>
1631                      [messageType] => methodCall
1632                      [faultCode] =>
1633                      [faultString] =>
1634                      [methodName] => pingback.ping
1635                      [params] => Array
1636                          (
1637                              [0] => http://www.example.net/?p=1 // Site that created the pingback.
1638                              [1] => https://www.example.com/?p=2 // Post being pingback'd on this site.
1639                          )
1640                  )
1641               */
1642              $pingback_args = $wp_xmlrpc_server->message->params;
1643          }
1644  
1645          if ( ! empty( $pingback_args[1] ) ) {
1646              $post_id = url_to_postid( $pingback_args[1] );
1647  
1648              // If pingbacks aren't open on this post, we'll still check whether this request is part of a potential DDOS,
1649              // but indicate to the server that pingbacks are indeed closed so we don't include this request in the user's stats,
1650              // since the user has already done their part by disabling pingbacks.
1651              $pingbacks_closed = false;
1652              
1653              $post = get_post( $post_id );
1654              
1655              if ( ! $post || ! pings_open( $post ) ) {
1656                  $pingbacks_closed = true;
1657              }
1658  
1659              // Note: If is_multicall is true and multicall_count=0, then we know this is at least the 2nd pingback we've processed in this multicall.
1660  
1661              $comment = array(
1662                  'comment_author_url' => $pingback_args[0],
1663                  'comment_post_ID' => $post_id,
1664                  'comment_author' => '',
1665                  'comment_author_email' => '',
1666                  'comment_content' => '',
1667                  'comment_type' => 'pingback',
1668                  'akismet_pre_check' => '1',
1669                  'comment_pingback_target' => $pingback_args[1],
1670                  'pingbacks_closed' => $pingbacks_closed ? '1' : '0',
1671                  'is_multicall' => $is_multicall,
1672                  'multicall_count' => $multicall_count,
1673              );
1674  
1675              $comment = self::auto_check_comment( $comment, 'xml-rpc' );
1676  
1677              if ( isset( $comment['akismet_result'] ) && 'true' == $comment['akismet_result'] ) {
1678                  // Sad: tightly coupled with the IXR classes. Unfortunately the action provides no context and no way to return anything.
1679                  $wp_xmlrpc_server->error( new IXR_Error( 0, 'Invalid discovery target' ) );
1680  
1681                  // Also note that if this was part of a multicall, a spam result will prevent the subsequent calls from being executed.
1682                  // This is probably fine, but it raises the bar for what should be acceptable as a false positive.
1683              }
1684          }
1685      }
1686  
1687      /**
1688       * Ensure that we are loading expected scalar values from akismet_as_submitted commentmeta.
1689       *
1690       * @param mixed $meta_value
1691       * @return mixed
1692       */
1693  	private static function sanitize_comment_as_submitted( $meta_value ) {
1694          if ( empty( $meta_value ) ) {
1695              return $meta_value;
1696          }
1697  
1698          $meta_value = (array) $meta_value;
1699  
1700          foreach ( $meta_value as $key => $value ) {
1701              if ( ! is_scalar( $value ) ) {
1702                  unset( $meta_value[ $key ] );
1703              } else {
1704                  // These can change, so they're not explicitly listed in comment_as_submitted_allowed_keys.
1705                  if ( strpos( $key, 'POST_ak_' ) === 0 ) {
1706                      continue;
1707                  }
1708  
1709                  if ( ! isset( self::$comment_as_submitted_allowed_keys[ $key ] ) ) {
1710                      unset( $meta_value[ $key ] );
1711                  }
1712              }
1713          }
1714  
1715          return $meta_value;
1716      }
1717      
1718  	public static function predefined_api_key() {
1719          if ( defined( 'WPCOM_API_KEY' ) ) {
1720              return true;
1721          }
1722          
1723          return apply_filters( 'akismet_predefined_api_key', false );
1724      }
1725  
1726      /**
1727       * Controls the display of a privacy related notice underneath the comment form using the `akismet_comment_form_privacy_notice` option and filter respectively.
1728       * Default is top not display the notice, leaving the choice to site admins, or integrators.
1729       */
1730  	public static function display_comment_form_privacy_notice() {
1731          if ( 'display' !== apply_filters( 'akismet_comment_form_privacy_notice', get_option( 'akismet_comment_form_privacy_notice', 'hide' ) ) ) {
1732              return;
1733          }
1734          echo apply_filters(
1735              'akismet_comment_form_privacy_notice_markup',
1736              '<p class="akismet_comment_form_privacy_notice">' . sprintf(
1737                  __( 'This site uses Akismet to reduce spam. <a href="%s" target="_blank" rel="nofollow noopener">Learn how your comment data is processed</a>.', 'akismet' ),
1738                  'https://akismet.com/privacy/'
1739              ) . '</p>'
1740          );
1741      }
1742  }


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