<?php

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class Akismet {

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const API_HOST = 'rest.akismet.com';

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const API_PORT = 80;

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const MAX_DELAY_BEFORE_MODERATION_EMAIL = 86400; // One day in seconds

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private static $last_comment = '';

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private static $initiated = false;

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private static $prevent_moderation_email_for_these_comments = array();

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private static $last_comment_result = null;

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private static $comment_as_submitted_allowed_keys = array( 'blog' => '', 'blog_charset' => '', 'blog_lang' => '', 'blog_ua' => '', 'comment_agent' => '', 'comment_author' => '', 'comment_author_IP' => '', 'comment_author_email' => '', 'comment_author_url' => '', 'comment_content' => '', 'comment_date_gmt' => '', 'comment_tags' => '', 'comment_type' => '', 'guid' => '', 'is_test' => '', 'permalink' => '', 'reporter' => '', 'site_domain' => '', 'submit_referer' => '', 'submit_uri' => '', 'user_ID' => '', 'user_agent' => '', 'user_id' => '', 'user_ip' => '' );

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/**

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* Is the comment check happening in the context of an API call? Of if false, then it's during the POST that happens after filling out a comment form.

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*

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* @var type bool

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*/

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private static $is_api_call = false;

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public static function init() {

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if ( ! self::$initiated ) {

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self::init_hooks();

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}

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}

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/**

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* Initializes WordPress hooks

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*/

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private static function init_hooks() {

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self::$initiated = true;

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add_action( 'wp_insert_comment', array( 'Akismet', 'auto_check_update_meta' ), 10, 2 );

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add_filter( 'preprocess_comment', array( 'Akismet', 'auto_check_comment' ), 1 );

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add_filter( 'rest_pre_insert_comment', array( 'Akismet', 'rest_auto_check_comment' ), 1 );

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add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments' ) );

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add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments_meta' ) );

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add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_orphaned_commentmeta' ) );

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add_action( 'akismet_schedule_cron_recheck', array( 'Akismet', 'cron_recheck' ) );

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add_action( 'comment_form', array( 'Akismet', 'add_comment_nonce' ), 1 );

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add_action( 'admin_head-edit-comments.php', array( 'Akismet', 'load_form_js' ) );

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add_action( 'comment_form', array( 'Akismet', 'load_form_js' ) );

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add_action( 'comment_form', array( 'Akismet', 'inject_ak_js' ) );

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add_filter( 'script_loader_tag', array( 'Akismet', 'set_form_js_async' ), 10, 3 );

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add_filter( 'comment_moderation_recipients', array( 'Akismet', 'disable_moderation_emails_if_unreachable' ), 1000, 2 );

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add_filter( 'pre_comment_approved', array( 'Akismet', 'last_comment_status' ), 10, 2 );

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add_action( 'transition_comment_status', array( 'Akismet', 'transition_comment_status' ), 10, 3 );

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// Run this early in the pingback call, before doing a remote fetch of the source uri

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add_action( 'xmlrpc_call', array( 'Akismet', 'pre_check_pingback' ) );

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// Jetpack compatibility

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add_filter( 'jetpack_options_whitelist', array( 'Akismet', 'add_to_jetpack_options_whitelist' ) );

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add_action( 'update_option_wordpress_api_key', array( 'Akismet', 'updated_option' ), 10, 2 );

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add_action( 'add_option_wordpress_api_key', array( 'Akismet', 'added_option' ), 10, 2 );

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add_action( 'comment_form_after', array( 'Akismet', 'display_comment_form_privacy_notice' ) );

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}

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public static function get_api_key() {

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return apply_filters( 'akismet_get_api_key', defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key') );

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}

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public static function check_key_status( $key, $ip = null ) {

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return self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option( 'home' ) ) ), 'verify-key', $ip );

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}

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public static function verify_key( $key, $ip = null ) {

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// Shortcut for obviously invalid keys.

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if ( strlen( $key ) != 12 ) {

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return 'invalid';

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}

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$response = self::check_key_status( $key, $ip );

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if ( $response[1] != 'valid' && $response[1] != 'invalid' )

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return 'failed';

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return $response[1];

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}

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public static function deactivate_key( $key ) {

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$response = self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option( 'home' ) ) ), 'deactivate' );

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if ( $response[1] != 'deactivated' )

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return 'failed';

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return $response[1];

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}

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/**

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* Add the akismet option to the Jetpack options management whitelist.

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*

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* @param array $options The list of whitelisted option names.

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* @return array The updated whitelist

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*/

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public static function add_to_jetpack_options_whitelist( $options ) {

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$options[] = 'wordpress_api_key';

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return $options;

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}

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/**

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* When the akismet option is updated, run the registration call.

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*

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* This should only be run when the option is updated from the Jetpack/WP.com

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* API call, and only if the new key is different than the old key.

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*

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* @param mixed $old_value The old option value.

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* @param mixed $value The new option value.

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*/

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public static function updated_option( $old_value, $value ) {

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// Not an API call

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if ( ! class_exists( 'WPCOM_JSON_API_Update_Option_Endpoint' ) ) {

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return;

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}

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// Only run the registration if the old key is different.

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if ( $old_value !== $value ) {

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self::verify_key( $value );

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}

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}

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/**

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* Treat the creation of an API key the same as updating the API key to a new value.

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*

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* @param mixed $option_name Will always be "wordpress_api_key", until something else hooks in here.

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* @param mixed $value The option value.

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*/

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public static function added_option( $option_name, $value ) {

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if ( 'wordpress_api_key' === $option_name ) {

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return self::updated_option( '', $value );

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}

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}

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public static function rest_auto_check_comment( $commentdata ) {

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self::$is_api_call = true;

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return self::auto_check_comment( $commentdata );

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}

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public static function auto_check_comment( $commentdata ) {

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// If no key is configured, then there's no point in doing any of this.

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if ( ! self::get_api_key() ) {

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return $commentdata;

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}

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self::$last_comment_result = null;

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$comment = $commentdata;

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$comment['user_ip'] = self::get_ip_address();

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$comment['user_agent'] = self::get_user_agent();

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$comment['referrer'] = self::get_referer();

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$comment['blog'] = get_option( 'home' );

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$comment['blog_lang'] = get_locale();

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$comment['blog_charset'] = get_option('blog_charset');

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$comment['permalink'] = get_permalink( $comment['comment_post_ID'] );

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if ( ! empty( $comment['user_ID'] ) ) {

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$comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );

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}

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/** See filter documentation in init_hooks(). */

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$akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );

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$comment['akismet_comment_nonce'] = 'inactive';

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if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {

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$comment['akismet_comment_nonce'] = 'failed';

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if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )

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$comment['akismet_comment_nonce'] = 'passed';

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// comment reply in wp-admin

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if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )

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$comment['akismet_comment_nonce'] = 'passed';

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}

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if ( self::is_test_mode() )

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$comment['is_test'] = 'true';

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foreach( $_POST as $key => $value ) {

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if ( is_string( $value ) )

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$comment["POST_{$key}"] = $value;

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}

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foreach ( $_SERVER as $key => $value ) {

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if ( ! is_string( $value ) ) {

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continue;

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}

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if ( preg_match( "/^HTTP_COOKIE/", $key ) ) {

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continue;

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}

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// Send any potentially useful $_SERVER vars, but avoid sending junk we don't need.

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if ( preg_match( "/^(HTTP_|REMOTE_ADDR|REQUEST_URI|DOCUMENT_URI)/", $key ) ) {

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$comment[ "$key" ] = $value;

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}

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}

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$post = get_post( $comment['comment_post_ID'] );

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if ( ! is_null( $post ) ) {

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// $post can technically be null, although in the past, it's always been an indicator of another plugin interfering.

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$comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;

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}

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$response = self::http_post( Akismet::build_query( $comment ), 'comment-check' );

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do_action( 'akismet_comment_check_response', $response );

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$commentdata['comment_as_submitted'] = array_intersect_key( $comment, self::$comment_as_submitted_allowed_keys );

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// Also include any form fields we inject into the comment form, like ak_js

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foreach ( $_POST as $key => $value ) {

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if ( is_string( $value ) && strpos( $key, 'ak_' ) === 0 ) {

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$commentdata['comment_as_submitted'][ 'POST_' . $key ] = $value;

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}

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}

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$commentdata['akismet_result'] = $response[1];

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if ( isset( $response[0]['x-akismet-pro-tip'] ) )

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$commentdata['akismet_pro_tip'] = $response[0]['x-akismet-pro-tip'];

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if ( isset( $response[0]['x-akismet-error'] ) ) {

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// An error occurred that we anticipated (like a suspended key) and want the user to act on.

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// Send to moderation.

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self::$last_comment_result = '0';

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}

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else if ( 'true' == $response[1] ) {

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// akismet_spam_count will be incremented later by comment_is_spam()

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self::$last_comment_result = 'spam';

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$discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() );

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do_action( 'akismet_spam_caught', $discard );

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if ( $discard ) {

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// The spam is obvious, so we're bailing out early.

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// akismet_result_spam() won't be called so bump the counter here

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if ( $incr = apply_filters( 'akismet_spam_count_incr', 1 ) ) {

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update_option( 'akismet_spam_count', get_option( 'akismet_spam_count' ) + $incr );

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}

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if ( self::$is_api_call ) {

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return new WP_Error( 'akismet_rest_comment_discarded', __( 'Comment discarded.', 'akismet' ) );

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}

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else {

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// Redirect back to the previous page, or failing that, the post permalink, or failing that, the homepage of the blog.

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$redirect_to = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : ( $post ? get_permalink( $post ) : home_url() );

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wp_safe_redirect( esc_url_raw( $redirect_to ) );

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die();

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}

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}

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else if ( self::$is_api_call ) {

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// The way the REST API structures its calls, we can set the comment_approved value right away.

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$commentdata['comment_approved'] = 'spam';

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}

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}

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// if the response is neither true nor false, hold the comment for moderation and schedule a recheck

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if ( 'true' != $response[1] && 'false' != $response[1] ) {

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if ( !current_user_can('moderate_comments') ) {

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// Comment status should be moderated

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self::$last_comment_result = '0';

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}

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if ( ! wp_next_scheduled( 'akismet_schedule_cron_recheck' ) ) {

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wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );

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do_action( 'akismet_scheduled_recheck', 'invalid-response-' . $response[1] );

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}

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self::$prevent_moderation_email_for_these_comments[] = $commentdata;

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}

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// Delete old comments daily

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if ( ! wp_next_scheduled( 'akismet_scheduled_delete' ) ) {

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wp_schedule_event( time(), 'daily', 'akismet_scheduled_delete' );

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}

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self::set_last_comment( $commentdata );

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self::fix_scheduled_recheck();

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return $commentdata;

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}

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public static function get_last_comment() {

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return self::$last_comment;

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}

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public static function set_last_comment( $comment ) {

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if ( is_null( $comment ) ) {

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self::$last_comment = null;

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}

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else {

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// We filter it here so that it matches the filtered comment data that we'll have to compare against later.

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// wp_filter_comment expects comment_author_IP

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self::$last_comment = wp_filter_comment(

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array_merge(

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array( 'comment_author_IP' => self::get_ip_address() ),

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$comment

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)

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);

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}

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}

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// this fires on wp_insert_comment. we can't update comment_meta when auto_check_comment() runs

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// because we don't know the comment ID at that point.

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public static function auto_check_update_meta( $id, $comment ) {

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// wp_insert_comment() might be called in other contexts, so make sure this is the same comment

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// as was checked by auto_check_comment

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if ( is_object( $comment ) && !empty( self::$last_comment ) && is_array( self::$last_comment ) ) {

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if ( self::matches_last_comment( $comment ) ) {

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load_plugin_textdomain( 'akismet' );

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// normal result: true or false

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if ( self::$last_comment['akismet_result'] == 'true' ) {

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update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );

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self::update_comment_history( $comment->comment_ID, '', 'check-spam' );

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if ( $comment->comment_approved != 'spam' ) {

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self::update_comment_history(

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$comment->comment_ID,

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'',

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'status-changed-' . $comment->comment_approved

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);

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}

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} elseif ( self::$last_comment['akismet_result'] == 'false' ) {

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update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );

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self::update_comment_history( $comment->comment_ID, '', 'check-ham' );

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// Status could be spam or trash, depending on the WP version and whether this change applies:

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// https://core.trac.wordpress.org/changeset/34726

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if ( $comment->comment_approved == 'spam' || $comment->comment_approved == 'trash' ) {

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if ( function_exists( 'wp_check_comment_disallowed_list' ) ) {

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if ( wp_check_comment_disallowed_list( $comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent ) ) {

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self::update_comment_history( $comment->comment_ID, '', 'wp-disallowed' );

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} else {

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self::update_comment_history( $comment->comment_ID, '', 'status-changed-' . $comment->comment_approved );

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}

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} else if ( function_exists( 'wp_blacklist_check' ) && wp_blacklist_check( $comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent ) ) {

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self::update_comment_history( $comment->comment_ID, '', 'wp-blacklisted' );

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} else {

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self::update_comment_history( $comment->comment_ID, '', 'status-changed-' . $comment->comment_approved );

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}

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}

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} else {

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// abnormal result: error

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update_comment_meta( $comment->comment_ID, 'akismet_error', time() );

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self::update_comment_history(

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$comment->comment_ID,

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'',

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'check-error',

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array( 'response' => substr( self::$last_comment['akismet_result'], 0, 50 ) )

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);

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}

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// record the complete original data as submitted for checking

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if ( isset( self::$last_comment['comment_as_submitted'] ) ) {

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update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', self::$last_comment['comment_as_submitted'] );

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}

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if ( isset( self::$last_comment['akismet_pro_tip'] ) ) {

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update_comment_meta( $comment->comment_ID, 'akismet_pro_tip', self::$last_comment['akismet_pro_tip'] );

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}

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}

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}

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}

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public static function delete_old_comments() {

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global $wpdb;

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/**

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* Determines how many comments will be deleted in each batch.

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*

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* @param int The default, as defined by AKISMET_DELETE_LIMIT.

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*/

[378] Fix | Delete

$delete_limit = apply_filters( 'akismet_delete_comment_limit', defined( 'AKISMET_DELETE_LIMIT' ) ? AKISMET_DELETE_LIMIT : 10000 );

[379] Fix | Delete

$delete_limit = max( 1, intval( $delete_limit ) );

[380] Fix | Delete

[381] Fix | Delete

/**

[382] Fix | Delete

* Determines how many days a comment will be left in the Spam queue before being deleted.

[383] Fix | Delete

*

[384] Fix | Delete

* @param int The default number of days.

[385] Fix | Delete

*/

[386] Fix | Delete

$delete_interval = apply_filters( 'akismet_delete_comment_interval', 15 );

[387] Fix | Delete

$delete_interval = max( 1, intval( $delete_interval ) );

[388] Fix | Delete

[389] Fix | Delete

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 ) ) ) {

[390] Fix | Delete

if ( empty( $comment_ids ) )

[391] Fix | Delete

return;

[392] Fix | Delete

[393] Fix | Delete

$wpdb->queries = array();

[394] Fix | Delete

[395] Fix | Delete

foreach ( $comment_ids as $comment_id ) {

[396] Fix | Delete

do_action( 'delete_comment', $comment_id );

[397] Fix | Delete

do_action( 'akismet_batch_delete_count', __FUNCTION__ );

[398] Fix | Delete

}

[399] Fix | Delete

[400] Fix | Delete

// Prepared as strings since comment_id is an unsigned BIGINT, and using %d will constrain the value to the maximum signed BIGINT.

[401] Fix | Delete

$format_string = implode( ", ", array_fill( 0, count( $comment_ids ), '%s' ) );

[402] Fix | Delete

[403] Fix | Delete

$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->comments} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) );

[404] Fix | Delete

$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) );

[405] Fix | Delete

[406] Fix | Delete

clean_comment_cache( $comment_ids );

[407] Fix | Delete

do_action( 'akismet_delete_comment_batch', count( $comment_ids ) );

[408] Fix | Delete

}

[409] Fix | Delete

[410] Fix | Delete

if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number

[411] Fix | Delete

$wpdb->query("OPTIMIZE TABLE {$wpdb->comments}");

[412] Fix | Delete

}

[413] Fix | Delete

[414] Fix | Delete

public static function delete_old_comments_meta() {

[415] Fix | Delete

global $wpdb;

[416] Fix | Delete

[417] Fix | Delete

$interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );

[418] Fix | Delete

[419] Fix | Delete

# enforce a minimum of 1 day

[420] Fix | Delete

$interval = absint( $interval );

[421] Fix | Delete

if ( $interval < 1 )

[422] Fix | Delete

$interval = 1;

[423] Fix | Delete

[424] Fix | Delete

// akismet_as_submitted meta values are large, so expire them

[425] Fix | Delete

// after $interval days regardless of the comment status

[426] Fix | Delete

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 ) ) ) {

[427] Fix | Delete

if ( empty( $comment_ids ) )

[428] Fix | Delete

return;

[429] Fix | Delete

[430] Fix | Delete

$wpdb->queries = array();

[431] Fix | Delete

[432] Fix | Delete

foreach ( $comment_ids as $comment_id ) {

[433] Fix | Delete

delete_comment_meta( $comment_id, 'akismet_as_submitted' );

[434] Fix | Delete

do_action( 'akismet_batch_delete_count', __FUNCTION__ );

[435] Fix | Delete

}

[436] Fix | Delete

[437] Fix | Delete

do_action( 'akismet_delete_commentmeta_batch', count( $comment_ids ) );

[438] Fix | Delete

}

[439] Fix | Delete

[440] Fix | Delete

if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number

[441] Fix | Delete

$wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");

[442] Fix | Delete

}

[443] Fix | Delete

[444] Fix | Delete

// Clear out comments meta that no longer have corresponding comments in the database

[445] Fix | Delete

public static function delete_orphaned_commentmeta() {

[446] Fix | Delete

global $wpdb;

[447] Fix | Delete

[448] Fix | Delete

$last_meta_id = 0;

[449] Fix | Delete

$start_time = isset( $_SERVER['REQUEST_TIME_FLOAT'] ) ? $_SERVER['REQUEST_TIME_FLOAT'] : microtime( true );

[450] Fix | Delete

$max_exec_time = max( ini_get('max_execution_time') - 5, 3 );

[451] Fix | Delete

[452] Fix | Delete

while ( $commentmeta_results = $wpdb->get_results( $wpdb->prepare( "SELECT m.meta_id, m.comment_id, m.meta_key FROM {$wpdb->commentmeta} as m LEFT JOIN {$wpdb->comments} as c USING(comment_id) WHERE c.comment_id IS NULL AND m.meta_id > %d ORDER BY m.meta_id LIMIT 1000", $last_meta_id ) ) ) {

[453] Fix | Delete

if ( empty( $commentmeta_results ) )

[454] Fix | Delete

return;

[455] Fix | Delete

[456] Fix | Delete

$wpdb->queries = array();

[457] Fix | Delete

[458] Fix | Delete

$commentmeta_deleted = 0;

[459] Fix | Delete

[460] Fix | Delete

foreach ( $commentmeta_results as $commentmeta ) {

[461] Fix | Delete

if ( 'akismet_' == substr( $commentmeta->meta_key, 0, 8 ) ) {

[462] Fix | Delete

delete_comment_meta( $commentmeta->comment_id, $commentmeta->meta_key );

[463] Fix | Delete

do_action( 'akismet_batch_delete_count', __FUNCTION__ );

[464] Fix | Delete

$commentmeta_deleted++;

[465] Fix | Delete

}

[466] Fix | Delete

[467] Fix | Delete

$last_meta_id = $commentmeta->meta_id;

[468] Fix | Delete

}

[469] Fix | Delete

[470] Fix | Delete

do_action( 'akismet_delete_commentmeta_batch', $commentmeta_deleted );

[471] Fix | Delete

[472] Fix | Delete

// If we're getting close to max_execution_time, quit for this round.

[473] Fix | Delete

if ( microtime(true) - $start_time > $max_exec_time )

[474] Fix | Delete

return;

[475] Fix | Delete

}

[476] Fix | Delete

[477] Fix | Delete

if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number

[478] Fix | Delete

$wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");

[479] Fix | Delete

}

[480] Fix | Delete

[481] Fix | Delete

// how many approved comments does this author have?

[482] Fix | Delete

public static function get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {

[483] Fix | Delete

global $wpdb;

[484] Fix | Delete

[485] Fix | Delete

if ( !empty( $user_id ) )

[486] Fix | Delete

return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE user_id = %d AND comment_approved = 1", $user_id ) );

[487] Fix | Delete

[488] Fix | Delete

if ( !empty( $comment_author_email ) )

[489] Fix | Delete

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 ) );

[490] Fix | Delete

[491] Fix | Delete

return 0;

[492] Fix | Delete

}

[493] Fix | Delete

[494] Fix | Delete

// get the full comment history for a given comment, as an array in reverse chronological order

[495] Fix | Delete

public static function get_comment_history( $comment_id ) {

[496] Fix | Delete

$history = get_comment_meta( $comment_id, 'akismet_history', false );

[497] Fix | Delete

if ( empty( $history ) || empty( $history[ 0 ] ) ) {

[498] Fix | Delete

return false;

[499] Fix | Delete