protect your blog from comment and trackback spam. It keeps your site protected from spam even while you sleep. To get started: 1) Click the "Activate" link to the left of this description, 2) Sign up for an Akismet API key, and 3) Go to your Akismet configuration page, and save your API key.
Version: 2.5.5
Author: Automattic
Author URI: http://automattic.com/wordpress-plugins/
License: GPLv2 or later
*/
/*
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
define('AKISMET_VERSION', '2.5.5');
define('AKISMET_PLUGIN_URL', plugin_dir_url( __FILE__ ));
/** If you hardcode a WP.com API key here, all key config screens will be hidden */
if ( defined('WPCOM_API_KEY') )
$wpcom_api_key = constant('WPCOM_API_KEY');
else
$wpcom_api_key = '';
// Make sure we don't expose any info if called directly
if ( !function_exists( 'add_action' ) ) {
echo "Hi there! I'm just a plugin, not much I can do when called directly.";
exit;
}
if ( isset($wp_db_version) && $wp_db_version <= 9872 )
include_once dirname( __FILE__ ) . '/legacy.php';
include_once dirname( __FILE__ ) . '/widget.php';
if ( is_admin() )
require_once dirname( __FILE__ ) . '/admin.php';
function akismet_init() {
global $wpcom_api_key, $akismet_api_host, $akismet_api_port;
if ( $wpcom_api_key )
$akismet_api_host = $wpcom_api_key . '.rest.akismet.com';
else
$akismet_api_host = get_option('wordpress_api_key') . '.rest.akismet.com';
$akismet_api_port = 80;
}
add_action('init', 'akismet_init');
function akismet_get_key() {
global $wpcom_api_key;
if ( !empty($wpcom_api_key) )
return $wpcom_api_key;
return get_option('wordpress_api_key');
}
function akismet_verify_key( $key, $ip = null ) {
global $akismet_api_host, $akismet_api_port, $wpcom_api_key;
$blog = urlencode( get_option('home') );
if ( $wpcom_api_key )
$key = $wpcom_api_key;
$response = akismet_http_post("key=$key&blog=$blog", 'rest.akismet.com', '/1.1/verify-key', $akismet_api_port, $ip);
if ( !is_array($response) || !isset($response[1]) || $response[1] != 'valid' && $response[1] != 'invalid' )
return 'failed';
return $response[1];
}
// if we're in debug or test modes, use a reduced service level so as not to polute training or stats data
function akismet_test_mode() {
if ( defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE )
return true;
return false;
}
// return a comma-separated list of role names for the given user
function akismet_get_user_roles($user_id ) {
$roles = false;
if ( !class_exists('WP_User') )
return false;
if ( $user_id > 0 ) {
$comment_user = new WP_User($user_id);
if ( isset($comment_user->roles) )
$roles = join(',', $comment_user->roles);
}
if ( is_multisite() && is_super_admin( $user_id ) ) {
if ( empty( $roles ) ) {
$roles = 'super_admin';
} else {
$comment_user->roles[] = 'super_admin';
$roles = join( ',', $comment_user->roles );
}
}
return $roles;
}
// Returns array with headers in $response[0] and body in $response[1]
function akismet_http_post($request, $host, $path, $port = 80, $ip=null) {
global $wp_version;
$akismet_ua = "WordPress/{$wp_version} | ";
$akismet_ua .= 'Akismet/' . constant( 'AKISMET_VERSION' );
$akismet_ua = apply_filters( 'akismet_ua', $akismet_ua );
$content_length = strlen( $request );
$http_host = $host;
// use a specific IP if provided
// needed by akismet_check_server_connectivity()
if ( $ip && long2ip( ip2long( $ip ) ) ) {
$http_host = $ip;
} else {
$http_host = $host;
}
// use the WP HTTP class if it is available
if ( function_exists( 'wp_remote_post' ) ) {
$http_args = array(
'body' => $request,
'headers' => array(
'Content-Type' => 'application/x-www-form-urlencoded; ' .
'charset=' . get_option( 'blog_charset' ),
'Host' => $host,
'User-Agent' => $akismet_ua
),
'httpversion' => '1.0',
'timeout' => 15
);
$akismet_url = "http://{$http_host}{$path}";
$response = wp_remote_post( $akismet_url, $http_args );
if ( is_wp_error( $response ) )
return '';
return array( $response['headers'], $response['body'] );
} else {
$http_request = "POST $path HTTP/1.0\r\n";
$http_request .= "Host: $host\r\n";
$http_request .= 'Content-Type: application/x-www-form-urlencoded; charset=' . get_option('blog_charset') . "\r\n";
$http_request .= "Content-Length: {$content_length}\r\n";
$http_request .= "User-Agent: {$akismet_ua}\r\n";
$http_request .= "\r\n";
$http_request .= $request;
$response = '';
if( false != ( $fs = @fsockopen( $http_host, $port, $errno, $errstr, 10 ) ) ) {
fwrite( $fs, $http_request );
while ( !feof( $fs ) )
$response .= fgets( $fs, 1160 ); // One TCP-IP packet
fclose( $fs );
$response = explode( "\r\n\r\n", $response, 2 );
}
return $response;
}
}
// filter handler used to return a spam result to pre_comment_approved
function akismet_result_spam( $approved ) {
// bump the counter here instead of when the filter is added to reduce the possibility of overcounting
if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
// this is a one-shot deal
remove_filter( 'pre_comment_approved', 'akismet_result_spam' );
return 'spam';
}
function akismet_result_hold( $approved ) {
// once only
remove_filter( 'pre_comment_approved', 'akismet_result_hold' );
return '0';
}
// how many approved comments does this author have?
function akismet_get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
global $wpdb;
if ( !empty($user_id) )
return $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->comments WHERE user_id = %d AND comment_approved = 1", $user_id ) );
if ( !empty($comment_author_email) )
return $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 ) );
return 0;
}
function akismet_microtime() {
$mtime = explode( ' ', microtime() );
return $mtime[1] + $mtime[0];
}
// log an event for a given comment, storing it in comment_meta
function akismet_update_comment_history( $comment_id, $message, $event=null ) {
global $current_user;
// failsafe for old WP versions
if ( !function_exists('add_comment_meta') )
return false;
$user = '';
if ( is_object($current_user) && isset($current_user->user_login) )
$user = $current_user->user_login;
$event = array(
'time' => akismet_microtime(),
'message' => $message,
'event' => $event,
'user' => $user,
);
// $unique = false so as to allow multiple values per comment
$r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
}
// get the full comment history for a given comment, as an array in reverse chronological order
function akismet_get_comment_history( $comment_id ) {
// failsafe for old WP versions
if ( !function_exists('add_comment_meta') )
return false;
$history = get_comment_meta( $comment_id, 'akismet_history', false );
usort( $history, 'akismet_cmp_time' );
return $history;
}
function akismet_cmp_time( $a, $b ) {
return $a['time'] > $b['time'] ? -1 : 1;
}
// this fires on wp_insert_comment. we can't update comment_meta when akismet_auto_check_comment() runs
// because we don't know the comment ID at that point.
function akismet_auto_check_update_meta( $id, $comment ) {
global $akismet_last_comment;
// failsafe for old WP versions
if ( !function_exists('add_comment_meta') )
return false;
// wp_insert_comment() might be called in other contexts, so make sure this is the same comment
// as was checked by akismet_auto_check_comment
if ( is_object($comment) && !empty($akismet_last_comment) && is_array($akismet_last_comment) ) {
if ( intval($akismet_last_comment['comment_post_ID']) == intval($comment->comment_post_ID)
&& $akismet_last_comment['comment_author'] == $comment->comment_author
&& $akismet_last_comment['comment_author_email'] == $comment->comment_author_email ) {
// normal result: true or false
if ( $akismet_last_comment['akismet_result'] == 'true' ) {
update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
akismet_update_comment_history( $comment->comment_ID, __('Akismet caught this comment as spam'), 'check-spam' );
if ( $comment->comment_approved != 'spam' )
akismet_update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s'), $comment->comment_approved), 'status-changed'.$comment->comment_approved );
} elseif ( $akismet_last_comment['akismet_result'] == 'false' ) {
update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
akismet_update_comment_history( $comment->comment_ID, __('Akismet cleared this comment'), 'check-ham' );
if ( $comment->comment_approved == 'spam' ) {
if ( wp_blacklist_check($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent) )
akismet_update_comment_history( $comment->comment_ID, __('Comment was caught by wp_blacklist_check'), 'wp-blacklisted' );
else
akismet_update_comment_history( $comment->comment_ID, sprintf( __('Comment status was changed to %s'), $comment->comment_approved), 'status-changed-'.$comment->comment_approved );
}
// abnormal result: error
} else {
update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
akismet_update_comment_history( $comment->comment_ID, sprintf( __('Akismet was unable to check this comment (response: %s), will automatically retry again later.'), $akismet_last_comment['akismet_result']), 'check-error' );
}
// record the complete original data as submitted for checking
if ( isset($akismet_last_comment['comment_as_submitted']) )
update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', $akismet_last_comment['comment_as_submitted'] );
}
}
}
add_action( 'wp_insert_comment', 'akismet_auto_check_update_meta', 10, 2 );
function akismet_auto_check_comment( $commentdata ) {
global $akismet_api_host, $akismet_api_port, $akismet_last_comment;
$comment = $commentdata;
$comment['user_ip'] = $_SERVER['REMOTE_ADDR'];
$comment['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
$comment['referrer'] = $_SERVER['HTTP_REFERER'];
$comment['blog'] = get_option('home');
$comment['blog_lang'] = get_locale();
$comment['blog_charset'] = get_option('blog_charset');
$comment['permalink'] = get_permalink($comment['comment_post_ID']);
if ( !empty( $comment['user_ID'] ) ) {
$comment['user_role'] = akismet_get_user_roles($comment['user_ID']);
}
$akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
$comment['akismet_comment_nonce'] = 'inactive';
if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
$comment['akismet_comment_nonce'] = 'failed';
if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
$comment['akismet_comment_nonce'] = 'passed';
// comment reply in wp-admin
if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
$comment['akismet_comment_nonce'] = 'passed';
}
if ( akismet_test_mode() )
$comment['is_test'] = 'true';
foreach ($_POST as $key => $value ) {
if ( is_string($value) )
$comment["POST_{$key}"] = $value;
}
$ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
foreach ( $_SERVER as $key => $value ) {
if ( !in_array( $key, $ignore ) && is_string($value) )
$comment["$key"] = $value;
else
$comment["$key"] = '';
}
$post = get_post( $comment['comment_post_ID'] );
$comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;
$query_string = '';
foreach ( $comment as $key => $data )
$query_string .= $key . '=' . urlencode( stripslashes($data) ) . '&';
$commentdata['comment_as_submitted'] = $comment;
$response = akismet_http_post($query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port);
$commentdata['akismet_result'] = $response[1];
if ( 'true' == $response[1] ) {
// akismet_spam_count will be incremented later by akismet_result_spam()
add_filter('pre_comment_approved', 'akismet_result_spam');
do_action( 'akismet_spam_caught' );
$last_updated = strtotime( $post->post_modified_gmt );
$diff = time() - $last_updated;
$diff = $diff / 86400;
if ( $post->post_type == 'post' && $diff > 30 && get_option( 'akismet_discard_month' ) == 'true' && empty($comment['user_ID']) ) {
// akismet_result_spam() won't be called so bump the counter here
if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
wp_safe_redirect( $_SERVER['HTTP_REFERER'] );
die();
}
}
// if the response is neither true nor false, hold the comment for moderation and schedule a recheck
if ( 'true' != $response[1] && 'false' != $response[1] ) {
if ( !wp_get_current_user() ) {
add_filter('pre_comment_approved', 'akismet_result_hold');
}
wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
}
if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_event') ) {
// WP 2.1+: delete old comments daily
if ( !wp_next_scheduled('akismet_scheduled_delete') )
wp_schedule_event(time(), 'daily', 'akismet_scheduled_delete');
} elseif ( (mt_rand(1, 10) == 3) ) {
// WP 2.0: run this one time in ten
akismet_delete_old();
}
$akismet_last_comment = $commentdata;
return $commentdata;
}
add_action('preprocess_comment', 'akismet_auto_check_comment', 1);
function akismet_delete_old() {
global $wpdb;
$now_gmt = current_time('mysql', 1);
$comment_ids = $wpdb->get_col("SELECT comment_id FROM $wpdb->comments WHERE DATE_SUB('$now_gmt', INTERVAL 15 DAY) > comment_date_gmt AND comment_approved = 'spam'");
if ( empty( $comment_ids ) )
return;
$comma_comment_ids = implode( ', ', array_map('intval', $comment_ids) );
do_action( 'delete_comment', $comment_ids );
$wpdb->query("DELETE FROM $wpdb->comments WHERE comment_id IN ( $comma_comment_ids )");
$wpdb->query("DELETE FROM $wpdb->commentmeta WHERE comment_id IN ( $comma_comment_ids )");
clean_comment_cache( $comment_ids );
$n = mt_rand(1, 5000);
if ( apply_filters('akismet_optimize_table', ($n == 11)) ) // lucky number
$wpdb->query("OPTIMIZE TABLE $wpdb->comments");
}
function akismet_delete_old_metadata() {
global $wpdb;
$now_gmt = current_time( 'mysql', 1 );
$interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );
# enfore a minimum of 1 day
$interval = absint( $interval );
if ( $interval < 1 ) {
return;
}
// akismet_as_submitted meta values are large, so expire them
// after $interval days regardless of the comment status
while ( TRUE ) {
$comment_ids = $wpdb->get_col( "SELECT $wpdb->comments.comment_id FROM $wpdb->commentmeta INNER JOIN $wpdb->comments USING(comment_id) WHERE meta_key = 'akismet_as_submitted' AND DATE_SUB('$now_gmt', INTERVAL {$interval} DAY) > comment_date_gmt LIMIT 10000" );
if ( empty( $comment_ids ) ) {
return;
}
foreach ( $comment_ids as $comment_id ) {
delete_comment_meta( $comment_id, 'akismet_as_submitted' );
}
}
/*
$n = mt_rand( 1, 5000 );
if ( apply_filters( 'akismet_optimize_table', ( $n == 11 ), 'commentmeta' ) ) { // lucky number
$wpdb->query( "OPTIMIZE TABLE $wpdb->commentmeta" );
}
*/
}
add_action('akismet_scheduled_delete', 'akismet_delete_old');
add_action('akismet_scheduled_delete', 'akismet_delete_old_metadata');
function akismet_check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
global $wpdb, $akismet_api_host, $akismet_api_port;
$id = (int) $id;
$c = $wpdb->get_row( "SELECT * FROM $wpdb->comments WHERE comment_ID = '$id'", ARRAY_A );
if ( !$c )
return;
$c['user_ip'] = $c['comment_author_IP'];
$c['user_agent'] = $c['comment_agent'];
$c['referrer'] = '';
$c['blog'] = get_option('home');
$c['blog_lang'] = get_locale();
$c['blog_charset'] = get_option('blog_charset');
$c['permalink'] = get_permalink($c['comment_post_ID']);
$id = $c['comment_ID'];
if ( akismet_test_mode() )
$c['is_test'] = 'true';
$c['recheck_reason'] = $recheck_reason;
$query_string = '';
foreach ( $c as $key => $data )
$query_string .= $key . '=' . urlencode( stripslashes($data) ) . '&';
$response = akismet_http_post($query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port);
return $response[1];
}
function akismet_cron_recheck() {
global $wpdb;
delete_option('akismet_available_servers');
$comment_errors = $wpdb->get_col( "
SELECT comment_id
FROM {$wpdb->prefix}commentmeta
WHERE meta_key = 'akismet_error'
LIMIT 100
" );
foreach ( (array) $comment_errors as $comment_id ) {
// if the comment no longer exists, remove the meta entry from the queue to avoid getting stuck
if ( !get_comment( $comment_id ) ) {
delete_comment_meta( $comment_id, 'akismet_error' );
continue;
}
add_comment_meta( $comment_id, 'akismet_rechecking', true );
$status = akismet_check_db_comment( $comment_id, 'retry' );
$msg = '';
if ( $status == 'true' ) {
$msg = __( 'Akismet caught this comment as spam during an automatic retry.' );
} elseif ( $status == 'false' ) {
$msg = __( 'Akismet cleared this comment during an automatic retry.' );
}
// If we got back a legit response then update the comment history
// other wise just bail now and try again later. No point in
// re-trying all the comments once we hit one failure.
if ( !empty( $msg ) ) {
delete_comment_meta( $comment_id, 'akismet_error' );
akismet_update_comment_history( $comment_id, $msg, 'cron-retry' );
update_comment_meta( $comment_id, 'akismet_result', $status );
// make sure the comment status is still pending. if it isn't, that means the user has already moved it elsewhere.
$comment = get_comment( $comment_id );
if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
if ( $status == 'true' ) {
wp_spam_comment( $comment_id );
} elseif ( $status == 'false' ) {
// comment is good, but it's still in the pending queue. depending on the moderation settings
// we may need to change it to approved.
if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
wp_set_comment_status( $comment_id, 1 );
}
}
} else {
delete_comment_meta( $comment_id, 'akismet_rechecking' );
wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
return;
}
}
$remaining = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->commentmeta WHERE meta_key = 'akismet_error'" ) );
if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
}
}
add_action( 'akismet_schedule_cron_recheck', 'akismet_cron_recheck' );
function akismet_add_comment_nonce( $post_id ) {
echo '';
wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
echo '
';
}
$akismet_comment_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
if ( $akismet_comment_nonce_option == 'true' || $akismet_comment_nonce_option == '' )
add_action( 'comment_form', 'akismet_add_comment_nonce' );
if ( '3.0.5' == $wp_version ) {
remove_filter( 'comment_text', 'wp_kses_data' );
if ( is_admin() )
add_filter( 'comment_text', 'wp_kses_post' );
}