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


Generated: Fri Aug 7 01:00:03 2020 Cross-referenced by PHPXref 0.7.1