wp-content/plugins/akismet/class.akismet.php

   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 $last_comment_result = null;
  12
  13         public static function init() {
  14                 if ( ! self::$initiated ) {
  15                         self::init_hooks();
  16                 }
  17         }
  18
  19         /**
  20          * Initializes WordPress hooks
  21          */
  22         private static function init_hooks() {
  23                 self::$initiated = true;
  24
  25                 add_action( 'wp_insert_comment', array( 'Akismet', 'auto_check_update_meta' ), 10, 2 );
  26                 add_filter( 'preprocess_comment', array( 'Akismet', 'auto_check_comment' ), 1 );
  27                 add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments' ) );
  28                 add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments_meta' ) );
  29                 add_action( 'akismet_schedule_cron_recheck', array( 'Akismet', 'cron_recheck' ) );
  30
  31                 $akismet_comment_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
  32
  33                 if ( $akismet_comment_nonce_option == 'true' || $akismet_comment_nonce_option == '' )
  34                         add_action( 'comment_form',  array( 'Akismet',  'add_comment_nonce' ), 1 );
  35
  36                 add_action( 'admin_head-edit-comments.php', array( 'Akismet', 'load_form_js' ) );
  37                 add_action( 'comment_form', array( 'Akismet', 'load_form_js' ) );
  38                 add_action( 'comment_form', array( 'Akismet', 'inject_ak_js' ) );
  39
  40                 add_filter( 'comment_moderation_recipients', array( 'Akismet', 'disable_moderation_emails_if_unreachable' ), 1000, 2 );
  41                 add_filter( 'pre_comment_approved', array( 'Akismet', 'last_comment_status' ), 10, 2 );
  42
  43                 add_action( 'transition_comment_status', array( 'Akismet', 'transition_comment_status' ), 10, 3 );
  44
  45                 // Run this early in the pingback call, before doing a remote fetch of the source uri
  46                 add_action( 'xmlrpc_call', array( 'Akismet', 'pre_check_pingback' ) );
  47
  48                 if ( '3.0.5' == $GLOBALS['wp_version'] ) {
  49                         remove_filter( 'comment_text', 'wp_kses_data' );
  50                         if ( is_admin() )
  51                                 add_filter( 'comment_text', 'wp_kses_post' );
  52                 }
  53         }
  54
  55         public static function get_api_key() {
  56                 return apply_filters( 'akismet_get_api_key', defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key') );
  57         }
  58
  59         public static function check_key_status( $key, $ip = null ) {
  60                 return self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option('home') ) ), 'verify-key', $ip );
  61         }
  62
  63         public static function verify_key( $key, $ip = null ) {
  64                 $response = self::check_key_status( $key, $ip );
  65
  66                 if ( $response[1] != 'valid' && $response[1] != 'invalid' )
  67                         return 'failed';
  68
  69                 self::update_alert( $response );
  70
  71                 return $response[1];
  72         }
  73
  74         public static function auto_check_comment( $commentdata ) {
  75                 self::$last_comment_result = null;
  76
  77                 $comment = $commentdata;
  78
  79                 $comment['user_ip']      = self::get_ip_address();
  80                 $comment['user_agent']   = self::get_user_agent();
  81                 $comment['referrer']     = self::get_referer();
  82                 $comment['blog']         = get_option('home');
  83                 $comment['blog_lang']    = get_locale();
  84                 $comment['blog_charset'] = get_option('blog_charset');
  85                 $comment['permalink']    = get_permalink( $comment['comment_post_ID'] );
  86
  87                 if ( !empty( $comment['user_ID'] ) )
  88                         $comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );
  89
  90                 $akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
  91                 $comment['akismet_comment_nonce'] = 'inactive';
  92                 if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
  93                         $comment['akismet_comment_nonce'] = 'failed';
  94                         if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
  95                                 $comment['akismet_comment_nonce'] = 'passed';
  96
  97                         // comment reply in wp-admin
  98                         if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
  99                                 $comment['akismet_comment_nonce'] = 'passed';
 100
 101                 }
 102
 103                 if ( self::is_test_mode() )
 104                         $comment['is_test'] = 'true';
 105
 106                 foreach( $_POST as $key => $value ) {
 107                         if ( is_string( $value ) )
 108                                 $comment["POST_{$key}"] = $value;
 109                 }
 110
 111                 $ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
 112
 113                 foreach ( $_SERVER as $key => $value ) {
 114                         if ( !in_array( $key, $ignore ) && is_string($value) )
 115                                 $comment["$key"] = $value;
 116                         else
 117                                 $comment["$key"] = '';
 118                 }
 119
 120                 $post = get_post( $comment['comment_post_ID'] );
 121                 $comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;
 122
 123                 $response = self::http_post( Akismet::build_query( $comment ), 'comment-check' );
 124
 125                 do_action( 'akismet_comment_check_response', $response );
 126
 127                 self::update_alert( $response );
 128
 129                 $commentdata['comment_as_submitted'] = array_intersect_key( $comment, 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' => '' ) );
 130                 $commentdata['akismet_result']       = $response[1];
 131
 132                 if ( isset( $response[0]['x-akismet-pro-tip'] ) )
 133                 $commentdata['akismet_pro_tip'] = $response[0]['x-akismet-pro-tip'];
 134
 135                 if ( isset( $response[0]['x-akismet-error'] ) ) {
 136                         // An error occurred that we anticipated (like a suspended key) and want the user to act on.
 137                         // Send to moderation.
 138                         self::$last_comment_result = '0';
 139                 }
 140                 else if ( 'true' == $response[1] ) {
 141                         // akismet_spam_count will be incremented later by comment_is_spam()
 142                         self::$last_comment_result = 'spam';
 143
 144                         $discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() );
 145
 146                         do_action( 'akismet_spam_caught', $discard );
 147
 148                         if ( $discard ) {
 149                                 // akismet_result_spam() won't be called so bump the counter here
 150                                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 151                                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 152                                 $redirect_to = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : get_permalink( $post );
 153                                 wp_safe_redirect( esc_url_raw( $redirect_to ) );
 154                                 die();
 155                         }
 156                 }
 157
 158                 // if the response is neither true nor false, hold the comment for moderation and schedule a recheck
 159                 if ( 'true' != $response[1] && 'false' != $response[1] ) {
 160                         if ( !current_user_can('moderate_comments') ) {
 161                                 // Comment status should be moderated
 162                                 self::$last_comment_result = '0';
 163                         }
 164                         if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_single_event') ) {
 165                                 if ( !wp_next_scheduled( 'akismet_schedule_cron_recheck' ) ) {
 166                                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 167                                         do_action( 'akismet_scheduled_recheck', 'invalid-response-' . $response[1] );
 168                                 }
 169                         }
 170
 171                         self::$prevent_moderation_email_for_these_comments[] = $commentdata;
 172                 }
 173
 174                 if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_event') ) {
 175                         // WP 2.1+: delete old comments daily
 176                         if ( !wp_next_scheduled( 'akismet_scheduled_delete' ) )
 177                                 wp_schedule_event( time(), 'daily', 'akismet_scheduled_delete' );
 178                 }
 179                 elseif ( (mt_rand(1, 10) == 3) ) {
 180                         // WP 2.0: run this one time in ten
 181                         self::delete_old_comments();
 182                 }
 183
 184                 self::set_last_comment( $commentdata );
 185                 self::fix_scheduled_recheck();
 186
 187                 return $commentdata;
 188         }
 189
 190         public static function get_last_comment() {
 191                 return self::$last_comment;
 192         }
 193
 194         public static function set_last_comment( $comment ) {
 195                 if ( is_null( $comment ) ) {
 196                         self::$last_comment = null;
 197                 }
 198                 else {
 199                         // We filter it here so that it matches the filtered comment data that we'll have to compare against later.
 200                         // wp_filter_comment expects comment_author_IP
 201                         self::$last_comment = wp_filter_comment(
 202                                 array_merge(
 203                                         array( 'comment_author_IP' => self::get_ip_address() ),
 204                                         $comment
 205                                 )
 206                         );
 207                 }
 208         }
 209
 210         // this fires on wp_insert_comment.  we can't update comment_meta when auto_check_comment() runs
 211         // because we don't know the comment ID at that point.
 212         public static function auto_check_update_meta( $id, $comment ) {
 213
 214                 // failsafe for old WP versions
 215                 if ( !function_exists('add_comment_meta') )
 216                         return false;
 217
 218                 if ( !isset( self::$last_comment['comment_author_email'] ) )
 219                         self::$last_comment['comment_author_email'] = '';
 220
 221                 // wp_insert_comment() might be called in other contexts, so make sure this is the same comment
 222                 // as was checked by auto_check_comment
 223                 if ( is_object( $comment ) && !empty( self::$last_comment ) && is_array( self::$last_comment ) ) {
 224                         if ( self::matches_last_comment( $comment ) ) {
 225
 226                                         load_plugin_textdomain( 'akismet' );
 227
 228                                         // normal result: true or false
 229                                         if ( self::$last_comment['akismet_result'] == 'true' ) {
 230                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
 231                                                 self::update_comment_history( $comment->comment_ID, __('Akismet caught this comment as spam', 'akismet'), 'check-spam' );
 232                                                 if ( $comment->comment_approved != 'spam' )
 233                                                         self::update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s', 'akismet'), $comment->comment_approved), 'status-changed'.$comment->comment_approved );
 234                                         }
 235                                         elseif ( self::$last_comment['akismet_result'] == 'false' ) {
 236                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
 237                                                 self::update_comment_history( $comment->comment_ID, __('Akismet cleared this comment', 'akismet'), 'check-ham' );
 238                                                 if ( $comment->comment_approved == 'spam' ) {
 239                                                         if ( wp_blacklist_check($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent) )
 240                                                                 self::update_comment_history( $comment->comment_ID, __('Comment was caught by wp_blacklist_check', 'akismet'), 'wp-blacklisted' );
 241                                                         else
 242                                                                 self::update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s', 'akismet'), $comment->comment_approved), 'status-changed-'.$comment->comment_approved );
 243                                                 }
 244                                         } // abnormal result: error
 245                                         else {
 246                                                 update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
 247                                                 self::update_comment_history( $comment->comment_ID, sprintf( __('Akismet was unable to check this comment (response: %s), will automatically retry again later.', 'akismet'), substr(self::$last_comment['akismet_result'], 0, 50)), 'check-error' );
 248                                         }
 249
 250                                         // record the complete original data as submitted for checking
 251                                         if ( isset( self::$last_comment['comment_as_submitted'] ) )
 252                                                 update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', self::$last_comment['comment_as_submitted'] );
 253
 254                                         if ( isset( self::$last_comment['akismet_pro_tip'] ) )
 255                                                 update_comment_meta( $comment->comment_ID, 'akismet_pro_tip', self::$last_comment['akismet_pro_tip'] );
 256                         }
 257                 }
 258         }
 259
 260         public static function delete_old_comments() {
 261                 global $wpdb;
 262
 263                 /**
 264                  * Determines how many comments will be deleted in each batch.
 265                  *
 266                  * @param int The default, as defined by AKISMET_DELETE_LIMIT.
 267                  */
 268                 $delete_limit = apply_filters( 'akismet_delete_comment_limit', defined( 'AKISMET_DELETE_LIMIT' ) ? AKISMET_DELETE_LIMIT : 10000 );
 269                 $delete_limit = max( 1, intval( $delete_limit ) );
 270
 271                 /**
 272                  * Determines how many days a comment will be left in the Spam queue before being deleted.
 273                  *
 274                  * @param int The default number of days.
 275                  */
 276                 $delete_interval = apply_filters( 'akismet_delete_comment_interval', 15 );
 277                 $delete_interval = max( 1, intval( $delete_interval ) );
 278
 279                 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 ) ) ) {
 280                         if ( empty( $comment_ids ) )
 281                                 return;
 282
 283                         $wpdb->queries = array();
 284
 285                         foreach ( $comment_ids as $comment_id ) {
 286                                 do_action( 'delete_comment', $comment_id );
 287                         }
 288
 289                         $comma_comment_ids = implode( ', ', array_map('intval', $comment_ids) );
 290
 291                         $wpdb->query("DELETE FROM {$wpdb->comments} WHERE comment_id IN ( $comma_comment_ids )");
 292                         $wpdb->query("DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( $comma_comment_ids )");
 293
 294                         clean_comment_cache( $comment_ids );
 295                 }
 296
 297                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number
 298                         $wpdb->query("OPTIMIZE TABLE {$wpdb->comments}");
 299         }
 300
 301         public static function delete_old_comments_meta() {
 302                 global $wpdb;
 303
 304                 $interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );
 305
 306                 # enfore a minimum of 1 day
 307                 $interval = absint( $interval );
 308                 if ( $interval < 1 )
 309                         $interval = 1;
 310
 311                 // akismet_as_submitted meta values are large, so expire them
 312                 // after $interval days regardless of the comment status
 313                 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 ) ) ) {
 314                         if ( empty( $comment_ids ) )
 315                                 return;
 316
 317                         $wpdb->queries = array();
 318
 319                         foreach ( $comment_ids as $comment_id ) {
 320                                 delete_comment_meta( $comment_id, 'akismet_as_submitted' );
 321                         }
 322                 }
 323
 324                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number
 325                         $wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");
 326         }
 327
 328         // how many approved comments does this author have?
 329         public static function get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
 330                 global $wpdb;
 331
 332                 if ( !empty( $user_id ) )
 333                         return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE user_id = %d AND comment_approved = 1", $user_id ) );
 334
 335                 if ( !empty( $comment_author_email ) )
 336                         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 ) );
 337
 338                 return 0;
 339         }
 340
 341         // get the full comment history for a given comment, as an array in reverse chronological order
 342         public static function get_comment_history( $comment_id ) {
 343
 344                 // failsafe for old WP versions
 345                 if ( !function_exists('add_comment_meta') )
 346                         return false;
 347
 348                 $history = get_comment_meta( $comment_id, 'akismet_history', false );
 349                 usort( $history, array( 'Akismet', '_cmp_time' ) );
 350                 return $history;
 351         }
 352
 353         // log an event for a given comment, storing it in comment_meta
 354         public static function update_comment_history( $comment_id, $message, $event=null ) {
 355                 global $current_user;
 356
 357                 // failsafe for old WP versions
 358                 if ( !function_exists('add_comment_meta') )
 359                         return false;
 360
 361                 $user = '';
 362                 if ( is_object( $current_user ) && isset( $current_user->user_login ) )
 363                         $user = $current_user->user_login;
 364
 365                 $event = array(
 366                         'time'    => self::_get_microtime(),
 367                         'message' => $message,
 368                         'event'   => $event,
 369                         'user'    => $user,
 370                 );
 371
 372                 // $unique = false so as to allow multiple values per comment
 373                 $r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
 374         }
 375
 376         public static function check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
 377                 global $wpdb;
 378
 379                 $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $id ), ARRAY_A );
 380                 if ( !$c )
 381                         return;
 382
 383                 $c['user_ip']        = $c['comment_author_IP'];
 384                 $c['user_agent']     = $c['comment_agent'];
 385                 $c['referrer']       = '';
 386                 $c['blog']           = get_option('home');
 387                 $c['blog_lang']      = get_locale();
 388                 $c['blog_charset']   = get_option('blog_charset');
 389                 $c['permalink']      = get_permalink($c['comment_post_ID']);
 390                 $c['recheck_reason'] = $recheck_reason;
 391
 392                 if ( self::is_test_mode() )
 393                         $c['is_test'] = 'true';
 394
 395                 $response = self::http_post( Akismet::build_query( $c ), 'comment-check' );
 396
 397                 return ( is_array( $response ) && ! empty( $response[1] ) ) ? $response[1] : false;
 398         }
 399
 400
 401
 402         public static function transition_comment_status( $new_status, $old_status, $comment ) {
 403
 404                 if ( $new_status == $old_status )
 405                         return;
 406
 407                 # we don't need to record a history item for deleted comments
 408                 if ( $new_status == 'delete' )
 409                         return;
 410
 411                 if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) && !current_user_can( 'moderate_comments' ) )
 412                         return;
 413
 414                 if ( defined('WP_IMPORTING') && WP_IMPORTING == true )
 415                         return;
 416
 417                 // if this is present, it means the status has been changed by a re-check, not an explicit user action
 418                 if ( get_comment_meta( $comment->comment_ID, 'akismet_rechecking' ) )
 419                         return;
 420
 421                 global $current_user;
 422                 $reporter = '';
 423                 if ( is_object( $current_user ) )
 424                         $reporter = $current_user->user_login;
 425
 426                 // Assumption alert:
 427                 // We want to submit comments to Akismet only when a moderator explicitly spams or approves it - not if the status
 428                 // is changed automatically by another plugin.  Unfortunately WordPress doesn't provide an unambiguous way to
 429                 // determine why the transition_comment_status action was triggered.  And there are several different ways by which
 430                 // to spam and unspam comments: bulk actions, ajax, links in moderation emails, the dashboard, and perhaps others.
 431                 // We'll assume that this is an explicit user action if certain POST/GET variables exist.
 432                 if ( ( isset( $_POST['status'] ) && in_array( $_POST['status'], array( 'spam', 'unspam' ) ) ) ||
 433                          ( isset( $_POST['spam'] )   && (int) $_POST['spam'] == 1 ) ||
 434                          ( isset( $_POST['unspam'] ) && (int) $_POST['unspam'] == 1 ) ||
 435                          ( isset( $_POST['comment_status'] )  && in_array( $_POST['comment_status'], array( 'spam', 'unspam' ) ) ) ||
 436                          ( isset( $_GET['action'] )  && in_array( $_GET['action'], array( 'spam', 'unspam' ) ) ) ||
 437                          ( isset( $_POST['action'] ) && in_array( $_POST['action'], array( 'editedcomment' ) ) )
 438                  ) {
 439                         if ( $new_status == 'spam' && ( $old_status == 'approved' || $old_status == 'unapproved' || !$old_status ) ) {
 440                                 return self::submit_spam_comment( $comment->comment_ID );
 441                         } elseif ( $old_status == 'spam' && ( $new_status == 'approved' || $new_status == 'unapproved' ) ) {
 442                                 return self::submit_nonspam_comment( $comment->comment_ID );
 443                         }
 444                 }
 445
 446                 self::update_comment_history( $comment->comment_ID, sprintf( __('%1$s changed the comment status to %2$s', 'akismet'), $reporter, $new_status ), 'status-' . $new_status );
 447         }
 448
 449         public static function submit_spam_comment( $comment_id ) {
 450                 global $wpdb, $current_user, $current_site;
 451
 452                 $comment_id = (int) $comment_id;
 453
 454                 $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
 455
 456                 if ( !$comment ) // it was deleted
 457                         return;
 458
 459                 if ( 'spam' != $comment->comment_approved )
 460                         return;
 461
 462                 // use the original version stored in comment_meta if available
 463                 $as_submitted = get_comment_meta( $comment_id, 'akismet_as_submitted', true);
 464
 465                 if ( $as_submitted && is_array( $as_submitted ) && isset( $as_submitted['comment_content'] ) )
 466                         $comment = (object) array_merge( (array)$comment, $as_submitted );
 467
 468                 $comment->blog         = get_bloginfo('url');
 469                 $comment->blog_lang    = get_locale();
 470                 $comment->blog_charset = get_option('blog_charset');
 471                 $comment->permalink    = get_permalink($comment->comment_post_ID);
 472
 473                 if ( is_object($current_user) )
 474                         $comment->reporter = $current_user->user_login;
 475
 476                 if ( is_object($current_site) )
 477                         $comment->site_domain = $current_site->domain;
 478
 479                 $comment->user_role = '';
 480                 if ( isset( $comment->user_ID ) )
 481                         $comment->user_role = Akismet::get_user_roles( $comment->user_ID );
 482
 483                 if ( self::is_test_mode() )
 484                         $comment->is_test = 'true';
 485
 486                 $post = get_post( $comment->comment_post_ID );
 487                 $comment->comment_post_modified_gmt = $post->post_modified_gmt;
 488
 489                 $response = Akismet::http_post( Akismet::build_query( $comment ), 'submit-spam' );
 490                 if ( $comment->reporter ) {
 491                         self::update_comment_history( $comment_id, sprintf( __('%s reported this comment as spam', 'akismet'), $comment->reporter ), 'report-spam' );
 492                         update_comment_meta( $comment_id, 'akismet_user_result', 'true' );
 493                         update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
 494                 }
 495
 496                 do_action('akismet_submit_spam_comment', $comment_id, $response[1]);
 497         }
 498
 499         public static function submit_nonspam_comment( $comment_id ) {
 500                 global $wpdb, $current_user, $current_site;
 501
 502                 $comment_id = (int) $comment_id;
 503
 504                 $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
 505                 if ( !$comment ) // it was deleted
 506                         return;
 507
 508                 // use the original version stored in comment_meta if available
 509                 $as_submitted = get_comment_meta( $comment_id, 'akismet_as_submitted', true);
 510
 511                 if ( $as_submitted && is_array($as_submitted) && isset($as_submitted['comment_content']) )
 512                         $comment = (object) array_merge( (array)$comment, $as_submitted );
 513
 514                 $comment->blog         = get_bloginfo('url');
 515                 $comment->blog_lang    = get_locale();
 516                 $comment->blog_charset = get_option('blog_charset');
 517                 $comment->permalink    = get_permalink( $comment->comment_post_ID );
 518                 $comment->user_role    = '';
 519
 520                 if ( is_object($current_user) )
 521                         $comment->reporter = $current_user->user_login;
 522
 523                 if ( is_object($current_site) )
 524                         $comment->site_domain = $current_site->domain;
 525
 526                 if ( isset( $comment->user_ID ) )
 527                         $comment->user_role = Akismet::get_user_roles($comment->user_ID);
 528
 529                 if ( Akismet::is_test_mode() )
 530                         $comment->is_test = 'true';
 531
 532                 $post = get_post( $comment->comment_post_ID );
 533                 $comment->comment_post_modified_gmt = $post->post_modified_gmt;
 534
 535                 $response = self::http_post( Akismet::build_query( $comment ), 'submit-ham' );
 536                 if ( $comment->reporter ) {
 537                         self::update_comment_history( $comment_id, sprintf( __('%s reported this comment as not spam', 'akismet'), $comment->reporter ), 'report-ham' );
 538                         update_comment_meta( $comment_id, 'akismet_user_result', 'false' );
 539                         update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
 540                 }
 541
 542                 do_action('akismet_submit_nonspam_comment', $comment_id, $response[1]);
 543         }
 544
 545         public static function cron_recheck() {
 546                 global $wpdb;
 547
 548                 $api_key = self::get_api_key();
 549
 550                 $status = self::verify_key( $api_key );
 551                 if ( get_option( 'akismet_alert_code' ) || $status == 'invalid' ) {
 552                         // since there is currently a problem with the key, reschedule a check for 6 hours hence
 553                         wp_schedule_single_event( time() + 21600, 'akismet_schedule_cron_recheck' );
 554                         do_action( 'akismet_scheduled_recheck', 'key-problem-' . get_option( 'akismet_alert_code' ) . '-' . $status );
 555                         return false;
 556                 }
 557
 558                 delete_option('akismet_available_servers');
 559
 560                 $comment_errors = $wpdb->get_col( "SELECT comment_id FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error' LIMIT 100" );
 561
 562                 load_plugin_textdomain( 'akismet' );
 563
 564                 foreach ( (array) $comment_errors as $comment_id ) {
 565                         // if the comment no longer exists, or is too old, remove the meta entry from the queue to avoid getting stuck
 566                         $comment = get_comment( $comment_id );
 567                         if ( !$comment || strtotime( $comment->comment_date_gmt ) < strtotime( "-15 days" ) ) {
 568                                 delete_comment_meta( $comment_id, 'akismet_error' );
 569                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 570                                 continue;
 571                         }
 572
 573                         add_comment_meta( $comment_id, 'akismet_rechecking', true );
 574                         $status = self::check_db_comment( $comment_id, 'retry' );
 575
 576                         $msg = '';
 577                         if ( $status == 'true' ) {
 578                                 $msg = __( 'Akismet caught this comment as spam during an automatic retry.' , 'akismet');
 579                         } elseif ( $status == 'false' ) {
 580                                 $msg = __( 'Akismet cleared this comment during an automatic retry.' , 'akismet');
 581                         }
 582
 583                         // If we got back a legit response then update the comment history
 584                         // other wise just bail now and try again later.  No point in
 585                         // re-trying all the comments once we hit one failure.
 586                         if ( !empty( $msg ) ) {
 587                                 delete_comment_meta( $comment_id, 'akismet_error' );
 588                                 self::update_comment_history( $comment_id, $msg, 'cron-retry' );
 589                                 update_comment_meta( $comment_id, 'akismet_result', $status );
 590                                 // make sure the comment status is still pending.  if it isn't, that means the user has already moved it elsewhere.
 591                                 $comment = get_comment( $comment_id );
 592                                 if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
 593                                         if ( $status == 'true' ) {
 594                                                 wp_spam_comment( $comment_id );
 595                                         } elseif ( $status == 'false' ) {
 596                                                 // comment is good, but it's still in the pending queue.  depending on the moderation settings
 597                                                 // we may need to change it to approved.
 598                                                 if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
 599                                                         wp_set_comment_status( $comment_id, 1 );
 600                                                 else if ( get_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true ) )
 601                                                         wp_notify_moderator( $comment_id );
 602                                         }
 603                                 }
 604
 605                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 606                         } else {
 607                                 // If this comment has been pending moderation for longer than MAX_DELAY_BEFORE_MODERATION_EMAIL,
 608                                 // send a moderation email now.
 609                                 if ( ( intval( gmdate( 'U' ) ) - strtotime( $comment->comment_date_gmt ) ) < self::MAX_DELAY_BEFORE_MODERATION_EMAIL ) {
 610                                         delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 611                                         wp_notify_moderator( $comment_id );
 612                                 }
 613
 614                                 delete_comment_meta( $comment_id, 'akismet_rechecking' );
 615                                 wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 616                                 do_action( 'akismet_scheduled_recheck', 'check-db-comment-' . $status );
 617                                 return;
 618                         }
 619                         delete_comment_meta( $comment_id, 'akismet_rechecking' );
 620                 }
 621
 622                 $remaining = $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error'" );
 623                 if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
 624                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 625                         do_action( 'akismet_scheduled_recheck', 'remaining' );
 626                 }
 627         }
 628
 629         public static function fix_scheduled_recheck() {
 630                 $future_check = wp_next_scheduled( 'akismet_schedule_cron_recheck' );
 631                 if ( !$future_check ) {
 632                         return;
 633                 }
 634
 635                 if ( get_option( 'akismet_alert_code' ) > 0 ) {
 636                         return;
 637                 }
 638
 639                 $check_range = time() + 1200;
 640                 if ( $future_check > $check_range ) {
 641                         wp_clear_scheduled_hook( 'akismet_schedule_cron_recheck' );
 642                         wp_schedule_single_event( time() + 300, 'akismet_schedule_cron_recheck' );
 643                         do_action( 'akismet_scheduled_recheck', 'fix-scheduled-recheck' );
 644                 }
 645         }
 646
 647         public static function add_comment_nonce( $post_id ) {
 648                 echo '<p style="display: none;">';
 649                 wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
 650                 echo '</p>';
 651         }
 652
 653         public static function is_test_mode() {
 654                 return defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE;
 655         }
 656
 657         public static function allow_discard() {
 658                 if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
 659                         return false;
 660                 if ( is_user_logged_in() )
 661                         return false;
 662
 663                 return ( get_option( 'akismet_strictness' ) === '1'  );
 664         }
 665
 666         public static function get_ip_address() {
 667                 return isset( $_SERVER['REMOTE_ADDR'] ) ? $_SERVER['REMOTE_ADDR'] : null;
 668         }
 669
 670         /**
 671          * Do these two comments, without checking the comment_ID, "match"?
 672          *
 673          * @param mixed $comment1 A comment object or array.
 674          * @param mixed $comment2 A comment object or array.
 675          * @return bool Whether the two comments should be treated as the same comment.
 676          */
 677         private static function comments_match( $comment1, $comment2 ) {
 678                 $comment1 = (array) $comment1;
 679                 $comment2 = (array) $comment2;
 680
 681                 return (
 682                            isset( $comment1['comment_post_ID'], $comment2['comment_post_ID'] )
 683                         && intval( $comment1['comment_post_ID'] ) == intval( $comment2['comment_post_ID'] )
 684                         && $comment1['comment_author'] == $comment2['comment_author']
 685                         && $comment1['comment_author_email'] == $comment2['comment_author_email']
 686                 );
 687         }
 688
 689         // Does the supplied comment match the details of the one most recently stored in self::$last_comment?
 690         public static function matches_last_comment( $comment ) {
 691                 if ( is_object( $comment ) )
 692                         $comment = (array) $comment;
 693
 694                 return self::comments_match( self::$last_comment, $comment );
 695         }
 696
 697         private static function get_user_agent() {
 698                 return isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null;
 699         }
 700
 701         private static function get_referer() {
 702                 return isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : null;
 703         }
 704
 705         // return a comma-separated list of role names for the given user
 706         public static function get_user_roles( $user_id ) {
 707                 $roles = false;
 708
 709                 if ( !class_exists('WP_User') )
 710                         return false;
 711
 712                 if ( $user_id > 0 ) {
 713                         $comment_user = new WP_User( $user_id );
 714                         if ( isset( $comment_user->roles ) )
 715                                 $roles = join( ',', $comment_user->roles );
 716                 }
 717
 718                 if ( is_multisite() && is_super_admin( $user_id ) ) {
 719                         if ( empty( $roles ) ) {
 720                                 $roles = 'super_admin';
 721                         } else {
 722                                 $comment_user->roles[] = 'super_admin';
 723                                 $roles = join( ',', $comment_user->roles );
 724                         }
 725                 }
 726
 727                 return $roles;
 728         }
 729
 730         // filter handler used to return a spam result to pre_comment_approved
 731         public static function last_comment_status( $approved, $comment ) {
 732                 // Only do this if it's the correct comment
 733                 if ( is_null(self::$last_comment_result) || ! self::matches_last_comment( $comment ) ) {
 734                         self::log( "comment_is_spam mismatched comment, returning unaltered $approved" );
 735                         return $approved;
 736                 }
 737
 738                 // bump the counter here instead of when the filter is added to reduce the possibility of overcounting
 739                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 740                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 741
 742                 return self::$last_comment_result;
 743         }
 744
 745         /**
 746          * If Akismet is temporarily unreachable, we don't want to "spam" the blogger with
 747          * moderation emails for comments that will be automatically cleared or spammed on
 748          * the next retry.
 749          *
 750          * For comments that will be rechecked later, empty the list of email addresses that
 751          * the moderation email would be sent to.
 752          *
 753          * @param array $emails An array of email addresses that the moderation email will be sent to.
 754          * @param int $comment_id The ID of the relevant comment.
 755          * @return array An array of email addresses that the moderation email will be sent to.
 756          */
 757         public static function disable_moderation_emails_if_unreachable( $emails, $comment_id ) {
 758                 if ( ! empty( self::$prevent_moderation_email_for_these_comments ) && ! empty( $emails ) ) {
 759                         $comment = get_comment( $comment_id );
 760
 761                         foreach ( self::$prevent_moderation_email_for_these_comments as $possible_match ) {
 762                                 if ( self::comments_match( $possible_match, $comment ) ) {
 763                                         update_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true );
 764                                         return array();
 765                                 }
 766                         }
 767                 }
 768
 769                 return $emails;
 770         }
 771
 772         public static function _cmp_time( $a, $b ) {
 773                 return $a['time'] > $b['time'] ? -1 : 1;
 774         }
 775
 776         public static function _get_microtime() {
 777                 $mtime = explode( ' ', microtime() );
 778                 return $mtime[1] + $mtime[0];
 779         }
 780
 781         /**
 782          * Make a POST request to the Akismet API.
 783          *
 784          * @param string $request The body of the request.
 785          * @param string $path The path for the request.
 786          * @param string $ip The specific IP address to hit.
 787          * @return array A two-member array consisting of the headers and the response body, both empty in the case of a failure.
 788          */
 789         public static function http_post( $request, $path, $ip=null ) {
 790
 791                 $akismet_ua = sprintf( 'WordPress/%s | Akismet/%s', $GLOBALS['wp_version'], constant( 'AKISMET_VERSION' ) );
 792                 $akismet_ua = apply_filters( 'akismet_ua', $akismet_ua );
 793
 794                 $content_length = strlen( $request );
 795
 796                 $api_key   = self::get_api_key();
 797                 $host      = self::API_HOST;
 798
 799                 if ( !empty( $api_key ) )
 800                         $host = $api_key.'.'.$host;
 801
 802                 $http_host = $host;
 803                 // use a specific IP if provided
 804                 // needed by Akismet_Admin::check_server_connectivity()
 805                 if ( $ip && long2ip( ip2long( $ip ) ) ) {
 806                         $http_host = $ip;
 807                 }
 808
 809                 $http_args = array(
 810                         'body' => $request,
 811                         'headers' => array(
 812                                 'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ),
 813                                 'Host' => $host,
 814                                 'User-Agent' => $akismet_ua,
 815                         ),
 816                         'httpversion' => '1.0',
 817                         'timeout' => 15
 818                 );
 819
 820                 $akismet_url = $http_akismet_url = "http://{$http_host}/1.1/{$path}";
 821
 822                 /**
 823                  * Try SSL first; if that fails, try without it and don't try it again for a while.
 824                  */
 825
 826                 $ssl = $ssl_failed = false;
 827
 828                 // Check if SSL requests were disabled fewer than X hours ago.
 829                 $ssl_disabled = get_option( 'akismet_ssl_disabled' );
 830
 831                 if ( $ssl_disabled && $ssl_disabled < ( time() - 60 * 60 * 24 ) ) { // 24 hours
 832                         $ssl_disabled = false;
 833                         delete_option( 'akismet_ssl_disabled' );
 834                 }
 835                 else if ( $ssl_disabled ) {
 836                         do_action( 'akismet_ssl_disabled' );
 837                 }
 838
 839                 if ( ! $ssl_disabled && function_exists( 'wp_http_supports') && ( $ssl = wp_http_supports( array( 'ssl' ) ) ) ) {
 840                         $akismet_url = set_url_scheme( $akismet_url, 'https' );
 841
 842                         do_action( 'akismet_https_request_pre' );
 843                 }
 844
 845                 $response = wp_remote_post( $akismet_url, $http_args );
 846
 847                 Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
 848
 849                 if ( $ssl && is_wp_error( $response ) ) {
 850                         do_action( 'akismet_https_request_failure', $response );
 851
 852                         // Intermittent connection problems may cause the first HTTPS
 853                         // request to fail and subsequent HTTP requests to succeed randomly.
 854                         // Retry the HTTPS request once before disabling SSL for a time.
 855                         $response = wp_remote_post( $akismet_url, $http_args );
 856
 857                         Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
 858
 859                         if ( is_wp_error( $response ) ) {
 860                                 $ssl_failed = true;
 861
 862                                 do_action( 'akismet_https_request_failure', $response );
 863
 864                                 do_action( 'akismet_http_request_pre' );
 865
 866                                 // Try the request again without SSL.
 867                                 $response = wp_remote_post( $http_akismet_url, $http_args );
 868
 869                                 Akismet::log( compact( 'http_akismet_url', 'http_args', 'response' ) );
 870                         }
 871                 }
 872
 873                 if ( is_wp_error( $response ) ) {
 874                         do_action( 'akismet_request_failure', $response );
 875
 876                         return array( '', '' );
 877                 }
 878
 879                 if ( $ssl_failed ) {
 880                         // The request failed when using SSL but succeeded without it. Disable SSL for future requests.
 881                         update_option( 'akismet_ssl_disabled', time() );
 882
 883                         do_action( 'akismet_https_disabled' );
 884                 }
 885
 886                 return array( $response['headers'], $response['body'] );
 887         }
 888
 889         // given a response from an API call like check_key_status(), update the alert code options if an alert is present.
 890         private static function update_alert( $response ) {
 891                 $code = $msg = null;
 892                 if ( isset( $response[0]['x-akismet-alert-code'] ) ) {
 893                         $code = $response[0]['x-akismet-alert-code'];
 894                         $msg  = $response[0]['x-akismet-alert-msg'];
 895                 }
 896
 897                 // only call update_option() if the value has changed
 898                 if ( $code != get_option( 'akismet_alert_code' ) ) {
 899                         if ( ! $code ) {
 900                                 delete_option( 'akismet_alert_code' );
 901                                 delete_option( 'akismet_alert_msg' );
 902                         }
 903                         else {
 904                                 update_option( 'akismet_alert_code', $code );
 905                                 update_option( 'akismet_alert_msg', $msg );
 906                         }
 907                 }
 908         }
 909
 910         public static function load_form_js() {
 911                 // WP < 3.3 can't enqueue a script this late in the game and still have it appear in the footer.
 912                 // Once we drop support for everything pre-3.3, this can change back to a single enqueue call.
 913                 wp_register_script( 'akismet-form', AKISMET__PLUGIN_URL . '_inc/form.js', array(), AKISMET_VERSION, true );
 914                 add_action( 'wp_footer', array( 'Akismet', 'print_form_js' ) );
 915                 add_action( 'admin_footer', array( 'Akismet', 'print_form_js' ) );
 916         }
 917
 918         public static function print_form_js() {
 919                 wp_print_scripts( 'akismet-form' );
 920         }
 921
 922         public static function inject_ak_js( $fields ) {
 923                 echo '<p style="display: none;">';
 924                 echo '<input type="hidden" id="ak_js" name="ak_js" value="' . mt_rand( 0, 250 ) . '"/>';
 925                 echo '</p>';
 926         }
 927
 928         private static function bail_on_activation( $message, $deactivate = true ) {
 929 ?>
 930 <!doctype html>
 931 <html>
 932 <head>
 933 <meta charset="<?php bloginfo( 'charset' ); ?>">
 934 <style>
 935 * {
 936         text-align: center;
 937         margin: 0;
 938         padding: 0;
 939         font-family: "Lucida Grande",Verdana,Arial,"Bitstream Vera Sans",sans-serif;
 940 }
 941 p {
 942         margin-top: 1em;
 943         font-size: 18px;
 944 }
 945 </style>
 946 <body>
 947 <p><?php echo esc_html( $message ); ?></p>
 948 </body>
 949 </html>
 950 <?php
 951                 if ( $deactivate ) {
 952                         $plugins = get_option( 'active_plugins' );
 953                         $akismet = plugin_basename( AKISMET__PLUGIN_DIR . 'akismet.php' );
 954                         $update  = false;
 955                         foreach ( $plugins as $i => $plugin ) {
 956                                 if ( $plugin === $akismet ) {
 957                                         $plugins[$i] = false;
 958                                         $update = true;
 959                                 }
 960                         }
 961
 962                         if ( $update ) {
 963                                 update_option( 'active_plugins', array_filter( $plugins ) );
 964                         }
 965                 }
 966                 exit;
 967         }
 968
 969         public static function view( $name, array $args = array() ) {
 970                 $args = apply_filters( 'akismet_view_arguments', $args, $name );
 971
 972                 foreach ( $args AS $key => $val ) {
 973                         $$key = $val;
 974                 }
 975
 976                 load_plugin_textdomain( 'akismet' );
 977
 978                 $file = AKISMET__PLUGIN_DIR . 'views/'. $name . '.php';
 979
 980                 include( $file );
 981         }
 982
 983         /**
 984          * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
 985          * @static
 986          */
 987         public static function plugin_activation() {
 988                 if ( version_compare( $GLOBALS['wp_version'], AKISMET__MINIMUM_WP_VERSION, '<' ) ) {
 989                         load_plugin_textdomain( 'akismet' );
 990
 991                         $message = '<strong>'.sprintf(esc_html__( 'Akismet %s requires WordPress %s or higher.' , 'akismet'), AKISMET_VERSION, AKISMET__MINIMUM_WP_VERSION ).'</strong> '.sprintf(__('Please <a href="%1$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', 'http://wordpress.org/extend/plugins/akismet/download/');
 992
 993                         Akismet::bail_on_activation( $message );
 994                 }
 995         }
 996
 997         /**
 998          * Removes all connection options
 999          * @static
1000          */
1001         public static function plugin_deactivation( ) {
1002                 //tidy up
1003         }
1004
1005         /**
1006          * Essentially a copy of WP's build_query but one that doesn't expect pre-urlencoded values.
1007          *
1008          * @param array $args An array of key => value pairs
1009          * @return string A string ready for use as a URL query string.
1010          */
1011         public static function build_query( $args ) {
1012                 return _http_build_query( $args, '', '&' );
1013         }
1014
1015         /**
1016          * Log debugging info to the error log.
1017          *
1018          * Enabled when WP_DEBUG_LOG is enabled, but can be disabled via the akismet_debug_log filter.
1019          *
1020          * @param mixed $akismet_debug The data to log.
1021          */
1022         public static function log( $akismet_debug ) {
1023                 if ( apply_filters( 'akismet_debug_log', defined( 'WP_DEBUG_LOG' ) && WP_DEBUG_LOG ) ) {
1024                         error_log( print_r( compact( 'akismet_debug' ), true ) );
1025                 }
1026         }
1027
1028         public static function pre_check_pingback( $method ) {
1029                 if ( $method !== 'pingback.ping' )
1030                         return;
1031
1032                 global $wp_xmlrpc_server;
1033
1034                 if ( !is_object( $wp_xmlrpc_server ) )
1035                         return false;
1036
1037                 // Lame: tightly coupled with the IXR class.
1038                 $args = $wp_xmlrpc_server->message->params;
1039
1040                 if ( !empty( $args[1] ) ) {
1041                         $post_id = url_to_postid( $args[1] );
1042
1043                         // If this gets through the pre-check, make sure we properly identify the outbound request as a pingback verification
1044                         Akismet::pingback_forwarded_for( null, $args[0] );
1045                         add_filter( 'http_request_args', array( 'Akismet', 'pingback_forwarded_for' ), 10, 2 );
1046
1047                         $comment = array(
1048                                 'comment_author_url' => $args[0],
1049                                 'comment_post_ID' => $post_id,
1050                                 'comment_author' => '',
1051                                 'comment_author_email' => '',
1052                                 'comment_content' => '',
1053                                 'comment_type' => 'pingback',
1054                                 'akismet_pre_check' => '1',
1055                                 'comment_pingback_target' => $args[1],
1056                         );
1057
1058                         $comment = Akismet::auto_check_comment( $comment );
1059
1060                         if ( isset( $comment['akismet_result'] ) && 'true' == $comment['akismet_result'] ) {
1061                                 // Lame: tightly coupled with the IXR classes. Unfortunately the action provides no context and no way to return anything.
1062                                 $wp_xmlrpc_server->error( new IXR_Error( 0, 'Invalid discovery target' ) );
1063                         }
1064                 }
1065         }
1066
1067         public static function pingback_forwarded_for( $r, $url ) {
1068                 static $urls = array();
1069
1070                 // Call this with $r == null to prime the callback to add headers on a specific URL
1071                 if ( is_null( $r ) && !in_array( $url, $urls ) ) {
1072                         $urls[] = $url;
1073                 }
1074
1075                 // Add X-Pingback-Forwarded-For header, but only for requests to a specific URL (the apparent pingback source)
1076                 if ( is_array( $r ) && is_array( $r['headers'] ) && !isset( $r['headers']['X-Pingback-Forwarded-For'] ) && in_array( $url, $urls ) ) {
1077                         $remote_ip = preg_replace( '/[^a-fx0-9:.,]/i', '', $_SERVER['REMOTE_ADDR'] );
1078
1079                         // Note: this assumes REMOTE_ADDR is correct, and it may not be if a reverse proxy or CDN is in use
1080                         $r['headers']['X-Pingback-Forwarded-For'] = $remote_ip;
1081
1082                         // Also identify the request as a pingback verification in the UA string so it appears in logs
1083                         $r['user-agent'] .= '; verifying pingback from ' . $remote_ip;
1084                 }
1085
1086                 return $r;
1087         }
1088 }