WordPress 4.0
[autoinstalls/wordpress.git] / 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_action( '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                 if ( '3.0.5' == $GLOBALS['wp_version'] ) {
46                         remove_filter( 'comment_text', 'wp_kses_data' );
47                         if ( is_admin() )
48                                 add_filter( 'comment_text', 'wp_kses_post' );
49                 }
50         }
51
52         public static function get_api_key() {
53                 return apply_filters( 'akismet_get_api_key', defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key') );
54         }
55
56         public static function check_key_status( $key, $ip = null ) {
57                 return self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option('home') ) ), 'verify-key', $ip );
58         }
59
60         public static function verify_key( $key, $ip = null ) {
61                 $response = self::check_key_status( $key, $ip );
62
63                 if ( $response[1] != 'valid' && $response[1] != 'invalid' )
64                         return 'failed';
65
66                 self::update_alert( $response );
67
68                 return $response[1];
69         }
70
71         public static function auto_check_comment( $commentdata ) {
72                 self::$last_comment_result = null;
73
74                 $comment = $commentdata;
75
76                 $comment['user_ip']      = self::get_ip_address();
77                 $comment['user_agent']   = self::get_user_agent();
78                 $comment['referrer']     = self::get_referer();
79                 $comment['blog']         = get_option('home');
80                 $comment['blog_lang']    = get_locale();
81                 $comment['blog_charset'] = get_option('blog_charset');
82                 $comment['permalink']    = get_permalink( $comment['comment_post_ID'] );
83
84                 if ( !empty( $comment['user_ID'] ) )
85                         $comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );
86
87                 $akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
88                 $comment['akismet_comment_nonce'] = 'inactive';
89                 if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
90                         $comment['akismet_comment_nonce'] = 'failed';
91                         if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
92                                 $comment['akismet_comment_nonce'] = 'passed';
93
94                         // comment reply in wp-admin
95                         if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
96                                 $comment['akismet_comment_nonce'] = 'passed';
97
98                 }
99
100                 if ( self::is_test_mode() )
101                         $comment['is_test'] = 'true';
102
103                 foreach( $_POST as $key => $value ) {
104                         if ( is_string( $value ) )
105                                 $comment["POST_{$key}"] = $value;
106                 }
107
108                 $ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
109
110                 foreach ( $_SERVER as $key => $value ) {
111                         if ( !in_array( $key, $ignore ) && is_string($value) )
112                                 $comment["$key"] = $value;
113                         else
114                                 $comment["$key"] = '';
115                 }
116
117                 $post = get_post( $comment['comment_post_ID'] );
118                 $comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;
119
120                 $response = self::http_post( Akismet::build_query( $comment ), 'comment-check' );
121
122                 do_action( 'akismet_comment_check_response', $response );
123
124                 self::update_alert( $response );
125
126                 $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' => '' ) );
127                 $commentdata['akismet_result']       = $response[1];
128
129                 if ( isset( $response[0]['x-akismet-pro-tip'] ) )
130                 $commentdata['akismet_pro_tip'] = $response[0]['x-akismet-pro-tip'];
131
132                 if ( isset( $response[0]['x-akismet-error'] ) ) {
133                         // An error occurred that we anticipated (like a suspended key) and want the user to act on.
134                         // Send to moderation.
135                         self::$last_comment_result = '0';
136                 }
137                 else if ( 'true' == $response[1] ) {
138                         // akismet_spam_count will be incremented later by comment_is_spam()
139                         self::$last_comment_result = 'spam';
140
141                         $discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() );
142
143                         do_action( 'akismet_spam_caught', $discard );
144
145                         if ( $discard ) {
146                                 // akismet_result_spam() won't be called so bump the counter here
147                                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
148                                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
149                                 $redirect_to = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : get_permalink( $post );
150                                 wp_safe_redirect( esc_url_raw( $redirect_to ) );
151                                 die();
152                         }
153                 }
154                 
155                 // if the response is neither true nor false, hold the comment for moderation and schedule a recheck
156                 if ( 'true' != $response[1] && 'false' != $response[1] ) {
157                         if ( !current_user_can('moderate_comments') ) {
158                                 // Comment status should be moderated
159                                 self::$last_comment_result = '0';
160                         }
161                         if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_single_event') ) {
162                                 if ( !wp_next_scheduled( 'akismet_schedule_cron_recheck' ) ) {
163                                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
164                                 }
165                         }
166
167                         self::$prevent_moderation_email_for_these_comments[] = $commentdata;
168                 }
169
170                 if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_event') ) {
171                         // WP 2.1+: delete old comments daily
172                         if ( !wp_next_scheduled( 'akismet_scheduled_delete' ) )
173                                 wp_schedule_event( time(), 'daily', 'akismet_scheduled_delete' );
174                 }
175                 elseif ( (mt_rand(1, 10) == 3) ) {
176                         // WP 2.0: run this one time in ten
177                         self::delete_old_comments();
178                 }
179                 
180                 self::set_last_comment( $commentdata );
181                 self::fix_scheduled_recheck();
182
183                 return self::$last_comment;
184         }
185         
186         public static function get_last_comment() {
187                 return self::$last_comment;
188         }
189         
190         public static function set_last_comment( $comment ) {
191                 if ( is_null( $comment ) ) {
192                         self::$last_comment = null;
193                 }
194                 else {
195                         // We filter it here so that it matches the filtered comment data that we'll have to compare against later.
196                         // wp_filter_comment expects comment_author_IP
197                         self::$last_comment = wp_filter_comment(
198                                 array_merge(
199                                         array( 'comment_author_IP' => self::get_ip_address() ),
200                                         $comment
201                                 )
202                         );
203                 }
204         }
205
206         // this fires on wp_insert_comment.  we can't update comment_meta when auto_check_comment() runs
207         // because we don't know the comment ID at that point.
208         public static function auto_check_update_meta( $id, $comment ) {
209
210                 // failsafe for old WP versions
211                 if ( !function_exists('add_comment_meta') )
212                         return false;
213
214                 if ( !isset( self::$last_comment['comment_author_email'] ) )
215                         self::$last_comment['comment_author_email'] = '';
216
217                 // wp_insert_comment() might be called in other contexts, so make sure this is the same comment
218                 // as was checked by auto_check_comment
219                 if ( is_object( $comment ) && !empty( self::$last_comment ) && is_array( self::$last_comment ) ) {
220                         if ( self::matches_last_comment( $comment ) ) {
221                                         
222                                         load_plugin_textdomain( 'akismet' );
223                                         
224                                         // normal result: true or false
225                                         if ( self::$last_comment['akismet_result'] == 'true' ) {
226                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
227                                                 self::update_comment_history( $comment->comment_ID, __('Akismet caught this comment as spam', 'akismet'), 'check-spam' );
228                                                 if ( $comment->comment_approved != 'spam' )
229                                                         self::update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s', 'akismet'), $comment->comment_approved), 'status-changed'.$comment->comment_approved );
230                                         }
231                                         elseif ( self::$last_comment['akismet_result'] == 'false' ) {
232                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
233                                                 self::update_comment_history( $comment->comment_ID, __('Akismet cleared this comment', 'akismet'), 'check-ham' );
234                                                 if ( $comment->comment_approved == 'spam' ) {
235                                                         if ( wp_blacklist_check($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent) )
236                                                                 self::update_comment_history( $comment->comment_ID, __('Comment was caught by wp_blacklist_check', 'akismet'), 'wp-blacklisted' );
237                                                         else
238                                                                 self::update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s', 'akismet'), $comment->comment_approved), 'status-changed-'.$comment->comment_approved );
239                                                 }
240                                         } // abnormal result: error
241                                         else {
242                                                 update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
243                                                 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' );
244                                         }
245
246                                         // record the complete original data as submitted for checking
247                                         if ( isset( self::$last_comment['comment_as_submitted'] ) )
248                                                 update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', self::$last_comment['comment_as_submitted'] );
249
250                                         if ( isset( self::$last_comment['akismet_pro_tip'] ) )
251                                                 update_comment_meta( $comment->comment_ID, 'akismet_pro_tip', self::$last_comment['akismet_pro_tip'] );
252                         }
253                 }
254         }
255
256         public static function delete_old_comments() {
257                 global $wpdb;
258
259                 while( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_id FROM {$wpdb->comments} WHERE DATE_SUB(NOW(), INTERVAL 15 DAY) > comment_date_gmt AND comment_approved = 'spam' LIMIT %d", defined( 'AKISMET_DELETE_LIMIT' ) ? AKISMET_DELETE_LIMIT : 10000 ) ) ) {
260                         if ( empty( $comment_ids ) )
261                                 return;
262
263                         $wpdb->queries = array();
264
265                         do_action( 'delete_comment', $comment_ids );
266
267                         $comma_comment_ids = implode( ', ', array_map('intval', $comment_ids) );
268
269                         $wpdb->query("DELETE FROM {$wpdb->comments} WHERE comment_id IN ( $comma_comment_ids )");
270                         $wpdb->query("DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( $comma_comment_ids )");
271
272                         clean_comment_cache( $comment_ids );
273                 }
274
275                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number
276                         $wpdb->query("OPTIMIZE TABLE {$wpdb->comments}");
277         }
278
279         public static function delete_old_comments_meta() {
280                 global $wpdb;
281
282                 $interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );
283
284                 # enfore a minimum of 1 day
285                 $interval = absint( $interval );
286                 if ( $interval < 1 )
287                         $interval = 1;
288
289                 // akismet_as_submitted meta values are large, so expire them
290                 // after $interval days regardless of the comment status
291                 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 ) ) ) {
292                         if ( empty( $comment_ids ) )
293                                 return;
294
295                         $wpdb->queries = array();
296
297                         foreach ( $comment_ids as $comment_id ) {
298                                 delete_comment_meta( $comment_id, 'akismet_as_submitted' );
299                         }
300                 }
301
302                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number
303                         $wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");
304         }
305
306         // how many approved comments does this author have?
307         public static function get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
308                 global $wpdb;
309
310                 if ( !empty( $user_id ) )
311                         return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE user_id = %d AND comment_approved = 1", $user_id ) );
312
313                 if ( !empty( $comment_author_email ) )
314                         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 ) );
315
316                 return 0;
317         }
318
319         // get the full comment history for a given comment, as an array in reverse chronological order
320         public static function get_comment_history( $comment_id ) {
321
322                 // failsafe for old WP versions
323                 if ( !function_exists('add_comment_meta') )
324                         return false;
325
326                 $history = get_comment_meta( $comment_id, 'akismet_history', false );
327                 usort( $history, array( 'Akismet', '_cmp_time' ) );
328                 return $history;
329         }
330
331         // log an event for a given comment, storing it in comment_meta
332         public static function update_comment_history( $comment_id, $message, $event=null ) {
333                 global $current_user;
334
335                 // failsafe for old WP versions
336                 if ( !function_exists('add_comment_meta') )
337                         return false;
338
339                 $user = '';
340                 if ( is_object( $current_user ) && isset( $current_user->user_login ) )
341                         $user = $current_user->user_login;
342
343                 $event = array(
344                         'time'    => self::_get_microtime(),
345                         'message' => $message,
346                         'event'   => $event,
347                         'user'    => $user,
348                 );
349
350                 // $unique = false so as to allow multiple values per comment
351                 $r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
352         }
353
354         public static function check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
355                 global $wpdb;
356
357                 $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $id ), ARRAY_A );
358                 if ( !$c )
359                         return;
360
361                 $c['user_ip']        = $c['comment_author_IP'];
362                 $c['user_agent']     = $c['comment_agent'];
363                 $c['referrer']       = '';
364                 $c['blog']           = get_option('home');
365                 $c['blog_lang']      = get_locale();
366                 $c['blog_charset']   = get_option('blog_charset');
367                 $c['permalink']      = get_permalink($c['comment_post_ID']);
368                 $c['recheck_reason'] = $recheck_reason;
369
370                 if ( self::is_test_mode() )
371                         $c['is_test'] = 'true';
372
373                 $response = self::http_post( Akismet::build_query( $c ), 'comment-check' );
374
375                 return ( is_array( $response ) && ! empty( $response[1] ) ) ? $response[1] : false;
376         }
377         
378         
379
380         public static function transition_comment_status( $new_status, $old_status, $comment ) {
381                 
382                 if ( $new_status == $old_status )
383                         return;
384
385                 # we don't need to record a history item for deleted comments
386                 if ( $new_status == 'delete' )
387                         return;
388                 
389                 if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) && !current_user_can( 'moderate_comments' ) )
390                         return;
391
392                 if ( defined('WP_IMPORTING') && WP_IMPORTING == true )
393                         return;
394                         
395                 // if this is present, it means the status has been changed by a re-check, not an explicit user action
396                 if ( get_comment_meta( $comment->comment_ID, 'akismet_rechecking' ) )
397                         return;
398                 
399                 global $current_user;
400                 $reporter = '';
401                 if ( is_object( $current_user ) )
402                         $reporter = $current_user->user_login;
403
404                 // Assumption alert:
405                 // We want to submit comments to Akismet only when a moderator explicitly spams or approves it - not if the status
406                 // is changed automatically by another plugin.  Unfortunately WordPress doesn't provide an unambiguous way to
407                 // determine why the transition_comment_status action was triggered.  And there are several different ways by which
408                 // to spam and unspam comments: bulk actions, ajax, links in moderation emails, the dashboard, and perhaps others.
409                 // We'll assume that this is an explicit user action if certain POST/GET variables exist.
410                 if ( ( isset( $_POST['status'] ) && in_array( $_POST['status'], array( 'spam', 'unspam' ) ) ) ||
411                          ( isset( $_POST['spam'] )   && (int) $_POST['spam'] == 1 ) ||
412                          ( isset( $_POST['unspam'] ) && (int) $_POST['unspam'] == 1 ) ||
413                          ( isset( $_POST['comment_status'] )  && in_array( $_POST['comment_status'], array( 'spam', 'unspam' ) ) ) ||
414                          ( isset( $_GET['action'] )  && in_array( $_GET['action'], array( 'spam', 'unspam' ) ) ) ||
415                          ( isset( $_POST['action'] ) && in_array( $_POST['action'], array( 'editedcomment' ) ) )
416                  ) {
417                         if ( $new_status == 'spam' && ( $old_status == 'approved' || $old_status == 'unapproved' || !$old_status ) ) {
418                                 return self::submit_spam_comment( $comment->comment_ID );
419                         } elseif ( $old_status == 'spam' && ( $new_status == 'approved' || $new_status == 'unapproved' ) ) {
420                                 return self::submit_nonspam_comment( $comment->comment_ID );
421                         }
422                 }
423
424                 self::update_comment_history( $comment->comment_ID, sprintf( __('%1$s changed the comment status to %2$s', 'akismet'), $reporter, $new_status ), 'status-' . $new_status );
425         }
426         
427         public static function submit_spam_comment( $comment_id ) {
428                 global $wpdb, $current_user, $current_site;
429
430                 $comment_id = (int) $comment_id;
431
432                 $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
433
434                 if ( !$comment ) // it was deleted
435                         return;
436
437                 if ( 'spam' != $comment->comment_approved )
438                         return;
439
440                 // use the original version stored in comment_meta if available
441                 $as_submitted = get_comment_meta( $comment_id, 'akismet_as_submitted', true);
442
443                 if ( $as_submitted && is_array( $as_submitted ) && isset( $as_submitted['comment_content'] ) )
444                         $comment = (object) array_merge( (array)$comment, $as_submitted );
445
446                 $comment->blog         = get_bloginfo('url');
447                 $comment->blog_lang    = get_locale();
448                 $comment->blog_charset = get_option('blog_charset');
449                 $comment->permalink    = get_permalink($comment->comment_post_ID);
450
451                 if ( is_object($current_user) )
452                         $comment->reporter = $current_user->user_login;
453
454                 if ( is_object($current_site) )
455                         $comment->site_domain = $current_site->domain;
456
457                 $comment->user_role = '';
458                 if ( isset( $comment->user_ID ) )
459                         $comment->user_role = Akismet::get_user_roles( $comment->user_ID );
460
461                 if ( self::is_test_mode() )
462                         $comment->is_test = 'true';
463
464                 $post = get_post( $comment->comment_post_ID );
465                 $comment->comment_post_modified_gmt = $post->post_modified_gmt;
466
467                 $response = Akismet::http_post( Akismet::build_query( $comment ), 'submit-spam' );
468                 if ( $comment->reporter ) {
469                         self::update_comment_history( $comment_id, sprintf( __('%s reported this comment as spam', 'akismet'), $comment->reporter ), 'report-spam' );
470                         update_comment_meta( $comment_id, 'akismet_user_result', 'true' );
471                         update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
472                 }
473
474                 do_action('akismet_submit_spam_comment', $comment_id, $response[1]);
475         }
476
477         public static function submit_nonspam_comment( $comment_id ) {
478                 global $wpdb, $current_user, $current_site;
479
480                 $comment_id = (int) $comment_id;
481
482                 $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
483                 if ( !$comment ) // it was deleted
484                         return;
485
486                 // use the original version stored in comment_meta if available
487                 $as_submitted = get_comment_meta( $comment_id, 'akismet_as_submitted', true);
488
489                 if ( $as_submitted && is_array($as_submitted) && isset($as_submitted['comment_content']) )
490                         $comment = (object) array_merge( (array)$comment, $as_submitted );
491
492                 $comment->blog         = get_bloginfo('url');
493                 $comment->blog_lang    = get_locale();
494                 $comment->blog_charset = get_option('blog_charset');
495                 $comment->permalink    = get_permalink( $comment->comment_post_ID );
496                 $comment->user_role    = '';
497
498                 if ( is_object($current_user) )
499                         $comment->reporter = $current_user->user_login;
500
501                 if ( is_object($current_site) )
502                         $comment->site_domain = $current_site->domain;
503
504                 if ( isset( $comment->user_ID ) )
505                         $comment->user_role = Akismet::get_user_roles($comment->user_ID);
506
507                 if ( Akismet::is_test_mode() )
508                         $comment->is_test = 'true';
509
510                 $post = get_post( $comment->comment_post_ID );
511                 $comment->comment_post_modified_gmt = $post->post_modified_gmt;
512
513                 $response = self::http_post( Akismet::build_query( $comment ), 'submit-ham' );
514                 if ( $comment->reporter ) {
515                         self::update_comment_history( $comment_id, sprintf( __('%s reported this comment as not spam', 'akismet'), $comment->reporter ), 'report-ham' );
516                         update_comment_meta( $comment_id, 'akismet_user_result', 'false' );
517                         update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
518                 }
519
520                 do_action('akismet_submit_nonspam_comment', $comment_id, $response[1]);
521         }
522
523         public static function cron_recheck() {
524                 global $wpdb;
525
526                 $api_key = self::get_api_key();
527
528                 $status = self::verify_key( $api_key );
529                 if ( get_option( 'akismet_alert_code' ) || $status == 'invalid' ) {
530                         // since there is currently a problem with the key, reschedule a check for 6 hours hence
531                         wp_schedule_single_event( time() + 21600, 'akismet_schedule_cron_recheck' );
532                         return false;
533                 }
534
535                 delete_option('akismet_available_servers');
536
537                 $comment_errors = $wpdb->get_col( "SELECT comment_id FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error' LIMIT 100" );
538                 
539                 load_plugin_textdomain( 'akismet' );
540
541                 foreach ( (array) $comment_errors as $comment_id ) {
542                         // if the comment no longer exists, or is too old, remove the meta entry from the queue to avoid getting stuck
543                         $comment = get_comment( $comment_id );
544                         if ( !$comment || strtotime( $comment->comment_date_gmt ) < strtotime( "-15 days" ) ) {
545                                 delete_comment_meta( $comment_id, 'akismet_error' );
546                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
547                                 continue;
548                         }
549
550                         add_comment_meta( $comment_id, 'akismet_rechecking', true );
551                         $status = self::check_db_comment( $comment_id, 'retry' );
552
553                         $msg = '';
554                         if ( $status == 'true' ) {
555                                 $msg = __( 'Akismet caught this comment as spam during an automatic retry.' , 'akismet');
556                         } elseif ( $status == 'false' ) {
557                                 $msg = __( 'Akismet cleared this comment during an automatic retry.' , 'akismet');
558                         }
559
560                         // If we got back a legit response then update the comment history
561                         // other wise just bail now and try again later.  No point in
562                         // re-trying all the comments once we hit one failure.
563                         if ( !empty( $msg ) ) {
564                                 delete_comment_meta( $comment_id, 'akismet_error' );
565                                 self::update_comment_history( $comment_id, $msg, 'cron-retry' );
566                                 update_comment_meta( $comment_id, 'akismet_result', $status );
567                                 // make sure the comment status is still pending.  if it isn't, that means the user has already moved it elsewhere.
568                                 $comment = get_comment( $comment_id );
569                                 if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
570                                         if ( $status == 'true' ) {
571                                                 wp_spam_comment( $comment_id );
572                                         } elseif ( $status == 'false' ) {
573                                                 // comment is good, but it's still in the pending queue.  depending on the moderation settings
574                                                 // we may need to change it to approved.
575                                                 if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
576                                                         wp_set_comment_status( $comment_id, 1 );
577                                                 else if ( get_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true ) )
578                                                         wp_notify_moderator( $comment_id );
579                                         }
580                                 }
581                                 
582                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
583                         } else {
584                                 // If this comment has been pending moderation for longer than MAX_DELAY_BEFORE_MODERATION_EMAIL,
585                                 // send a moderation email now.
586                                 if ( ( intval( gmdate( 'U' ) ) - strtotime( $comment->comment_date_gmt ) ) < self::MAX_DELAY_BEFORE_MODERATION_EMAIL ) {
587                                         delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
588                                         wp_notify_moderator( $comment_id );
589                                 }
590
591                                 delete_comment_meta( $comment_id, 'akismet_rechecking' );
592                                 wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
593                                 return;
594                         }
595                         delete_comment_meta( $comment_id, 'akismet_rechecking' );
596                 }
597
598                 $remaining = $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error'" );
599                 if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
600                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
601                 }
602         }
603
604         public static function fix_scheduled_recheck() {
605                 $future_check = wp_next_scheduled( 'akismet_schedule_cron_recheck' );
606                 if ( !$future_check ) {
607                         return;
608                 }
609
610                 if ( get_option( 'akismet_alert_code' ) > 0 ) {
611                         return;
612                 }
613
614                 $check_range = time() + 1200;
615                 if ( $future_check > $check_range ) {
616                         wp_clear_scheduled_hook( 'akismet_schedule_cron_recheck' );
617                         wp_schedule_single_event( time() + 300, 'akismet_schedule_cron_recheck' );
618                 }
619         }
620
621         public static function add_comment_nonce( $post_id ) {
622                 echo '<p style="display: none;">';
623                 wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
624                 echo '</p>';
625         }
626
627         public static function is_test_mode() {
628                 return defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE;
629         }
630         
631         public static function allow_discard() {
632                 if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
633                         return false;
634                 if ( is_user_logged_in() )
635                         return false;
636         
637                 return ( get_option( 'akismet_strictness' ) === '1'  );
638         }
639
640         public static function get_ip_address() {
641                 return isset( $_SERVER['REMOTE_ADDR'] ) ? $_SERVER['REMOTE_ADDR'] : null;
642         }
643         
644         /**
645          * Do these two comments, without checking the comment_ID, "match"?
646          *
647          * @param mixed $comment1 A comment object or array.
648          * @param mixed $comment2 A comment object or array.
649          * @return bool Whether the two comments should be treated as the same comment.
650          */
651         private static function comments_match( $comment1, $comment2 ) {
652                 $comment1 = (array) $comment1;
653                 $comment2 = (array) $comment2;
654                 
655                 return (
656                            isset( $comment1['comment_post_ID'], $comment2['comment_post_ID'] )
657                         && intval( $comment1['comment_post_ID'] ) == intval( $comment2['comment_post_ID'] )
658                         && $comment1['comment_author'] == $comment2['comment_author']
659                         && $comment1['comment_author_email'] == $comment2['comment_author_email']
660                 );
661         }
662         
663         // Does the supplied comment match the details of the one most recently stored in self::$last_comment?
664         public static function matches_last_comment( $comment ) {
665                 if ( is_object( $comment ) )
666                         $comment = (array) $comment;
667
668                 return self::comments_match( self::$last_comment, $comment );
669         }
670
671         private static function get_user_agent() {
672                 return isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null;
673         }
674
675         private static function get_referer() {
676                 return isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : null;
677         }
678
679         // return a comma-separated list of role names for the given user
680         public static function get_user_roles( $user_id ) {
681                 $roles = false;
682
683                 if ( !class_exists('WP_User') )
684                         return false;
685
686                 if ( $user_id > 0 ) {
687                         $comment_user = new WP_User( $user_id );
688                         if ( isset( $comment_user->roles ) )
689                                 $roles = join( ',', $comment_user->roles );
690                 }
691
692                 if ( is_multisite() && is_super_admin( $user_id ) ) {
693                         if ( empty( $roles ) ) {
694                                 $roles = 'super_admin';
695                         } else {
696                                 $comment_user->roles[] = 'super_admin';
697                                 $roles = join( ',', $comment_user->roles );
698                         }
699                 }
700
701                 return $roles;
702         }
703
704         // filter handler used to return a spam result to pre_comment_approved
705         public static function last_comment_status( $approved, $comment ) {
706                 // Only do this if it's the correct comment
707                 if ( is_null(self::$last_comment_result) || ! self::matches_last_comment( $comment ) ) {
708                         self::log( "comment_is_spam mismatched comment, returning unaltered $approved" );
709                         return $approved;
710                 }
711
712                 // bump the counter here instead of when the filter is added to reduce the possibility of overcounting
713                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
714                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
715
716                 return self::$last_comment_result;
717         }
718         
719         /**
720          * If Akismet is temporarily unreachable, we don't want to "spam" the blogger with
721          * moderation emails for comments that will be automatically cleared or spammed on
722          * the next retry.
723          *
724          * For comments that will be rechecked later, empty the list of email addresses that
725          * the moderation email would be sent to.
726          *
727          * @param array $emails An array of email addresses that the moderation email will be sent to.
728          * @param int $comment_id The ID of the relevant comment.
729          * @return array An array of email addresses that the moderation email will be sent to.
730          */
731         public static function disable_moderation_emails_if_unreachable( $emails, $comment_id ) {
732                 if ( ! empty( self::$prevent_moderation_email_for_these_comments ) && ! empty( $emails ) ) {
733                         $comment = get_comment( $comment_id );
734
735                         foreach ( self::$prevent_moderation_email_for_these_comments as $possible_match ) {
736                                 if ( self::comments_match( $possible_match, $comment ) ) {
737                                         update_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true );
738                                         return array();
739                                 }
740                         }
741                 }
742
743                 return $emails;
744         }
745
746         public static function _cmp_time( $a, $b ) {
747                 return $a['time'] > $b['time'] ? -1 : 1;
748         }
749
750         public static function _get_microtime() {
751                 $mtime = explode( ' ', microtime() );
752                 return $mtime[1] + $mtime[0];
753         }
754
755         /**
756          * Make a POST request to the Akismet API.
757          *
758          * @param string $request The body of the request.
759          * @param string $path The path for the request.
760          * @param string $ip The specific IP address to hit.
761          * @return array A two-member array consisting of the headers and the response body, both empty in the case of a failure.
762          */
763         public static function http_post( $request, $path, $ip=null ) {
764
765                 $akismet_ua = sprintf( 'WordPress/%s | Akismet/%s', $GLOBALS['wp_version'], constant( 'AKISMET_VERSION' ) );
766                 $akismet_ua = apply_filters( 'akismet_ua', $akismet_ua );
767
768                 $content_length = strlen( $request );
769
770                 $api_key   = self::get_api_key();
771                 $host      = self::API_HOST;
772
773                 if ( !empty( $api_key ) )
774                         $host = $api_key.'.'.$host;
775
776                 $http_host = $host;
777                 // use a specific IP if provided
778                 // needed by Akismet_Admin::check_server_connectivity()
779                 if ( $ip && long2ip( ip2long( $ip ) ) ) {
780                         $http_host = $ip;
781                 }
782
783                 $http_args = array(
784                         'body' => $request,
785                         'headers' => array(
786                                 'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ),
787                                 'Host' => $host,
788                                 'User-Agent' => $akismet_ua,
789                         ),
790                         'httpversion' => '1.0',
791                         'timeout' => 15
792                 );
793
794                 $akismet_url = "http://{$http_host}/1.1/{$path}";
795                 $response = wp_remote_post( $akismet_url, $http_args );
796                 Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
797                 if ( is_wp_error( $response ) )
798                         return array( '', '' );
799
800                 return array( $response['headers'], $response['body'] );
801         }
802
803         // given a response from an API call like check_key_status(), update the alert code options if an alert is present.
804         private static function update_alert( $response ) {
805                 $code = $msg = null;
806                 if ( isset( $response[0]['x-akismet-alert-code'] ) ) {
807                         $code = $response[0]['x-akismet-alert-code'];
808                         $msg  = $response[0]['x-akismet-alert-msg'];
809                 }
810
811                 // only call update_option() if the value has changed
812                 if ( $code != get_option( 'akismet_alert_code' ) ) {
813                         if ( ! $code ) {
814                                 delete_option( 'akismet_alert_code' );
815                                 delete_option( 'akismet_alert_msg' );
816                         }
817                         else {
818                                 update_option( 'akismet_alert_code', $code );
819                                 update_option( 'akismet_alert_msg', $msg );
820                         }
821                 }
822         }
823
824         public static function load_form_js() {
825                 // WP < 3.3 can't enqueue a script this late in the game and still have it appear in the footer.
826                 // Once we drop support for everything pre-3.3, this can change back to a single enqueue call.
827                 wp_register_script( 'akismet-form', AKISMET__PLUGIN_URL . '_inc/form.js', array(), AKISMET_VERSION, true );
828                 add_action( 'wp_footer', array( 'Akismet', 'print_form_js' ) );
829                 add_action( 'admin_footer', array( 'Akismet', 'print_form_js' ) );
830         }
831         
832         public static function print_form_js() {
833                 wp_print_scripts( 'akismet-form' );
834         }
835
836         public static function inject_ak_js( $fields ) {
837                 echo '<p style="display: none;">';
838                 echo '<input type="hidden" id="ak_js" name="ak_js" value="' . mt_rand( 0, 250 ) . '"/>';
839                 echo '</p>';
840         }
841
842         private static function bail_on_activation( $message, $deactivate = true ) {
843 ?>
844 <!doctype html>
845 <html>
846 <head>
847 <meta charset="<?php bloginfo( 'charset' ); ?>">
848 <style>
849 * {
850         text-align: center;
851         margin: 0;
852         padding: 0;
853         font-family: "Lucida Grande",Verdana,Arial,"Bitstream Vera Sans",sans-serif;
854 }
855 p {
856         margin-top: 1em;
857         font-size: 18px;
858 }
859 </style>
860 <body>
861 <p><?php echo esc_html( $message ); ?></p>
862 </body>
863 </html>
864 <?php
865                 if ( $deactivate ) {
866                         $plugins = get_option( 'active_plugins' );
867                         $akismet = plugin_basename( AKISMET__PLUGIN_DIR . 'akismet.php' );
868                         $update  = false;
869                         foreach ( $plugins as $i => $plugin ) {
870                                 if ( $plugin === $akismet ) {
871                                         $plugins[$i] = false;
872                                         $update = true;
873                                 }
874                         }
875
876                         if ( $update ) {
877                                 update_option( 'active_plugins', array_filter( $plugins ) );
878                         }
879                 }
880                 exit;
881         }
882
883         public static function view( $name, array $args = array() ) {
884                 $args = apply_filters( 'akismet_view_arguments', $args, $name );
885                 
886                 foreach ( $args AS $key => $val ) {
887                         $$key = $val;
888                 }
889                 
890                 load_plugin_textdomain( 'akismet' );
891
892                 $file = AKISMET__PLUGIN_DIR . 'views/'. $name . '.php';
893
894                 include( $file );
895         }
896
897         /**
898          * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
899          * @static
900          */
901         public static function plugin_activation() {
902                 if ( version_compare( $GLOBALS['wp_version'], AKISMET__MINIMUM_WP_VERSION, '<' ) ) {
903                         load_plugin_textdomain( 'akismet' );
904                         
905                         $message = '<strong>'.sprintf(esc_html__( 'Akismet %s requires WordPress %s or higher.' , 'akismet'), AKISMET_VERSION, AKISMET__MINIMUM_WP_VERSION ).'</strong> '.sprintf(__('Please <a href="%1$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/');
906
907                         Akismet::bail_on_activation( $message );
908                 }
909         }
910
911         /**
912          * Removes all connection options
913          * @static
914          */
915         public static function plugin_deactivation( ) {
916                 //tidy up
917         }
918         
919         /**
920          * Essentially a copy of WP's build_query but one that doesn't expect pre-urlencoded values.
921          *
922          * @param array $args An array of key => value pairs
923          * @return string A string ready for use as a URL query string.
924          */
925         public static function build_query( $args ) {
926                 return _http_build_query( $args, '', '&' );
927         }
928
929         public static function log( $akismet_debug ) {
930                 if ( defined( 'WP_DEBUG_LOG' ) && WP_DEBUG_LOG )
931                         error_log( print_r( compact( 'akismet_debug' ), 1 ) ); //send message to debug.log when in debug mode
932         }
933 }