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Use the Comment Blacklist to check Contact Form submissions for spam. #11037

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merged 1 commit into from
Jan 2, 2019
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Use the Comment Blacklist to check Contact Form submissions for spam. #11037

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25 changes: 25 additions & 0 deletions modules/contact-form/grunion-contact-form.php
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Original file line number Diff line number Diff line change
Expand Up @@ -136,6 +136,8 @@ function __construct() {
) {
add_filter( 'widget_text', array( $this, 'widget_shortcode_hack' ), 5 );
}

add_filter( 'jetpack_contact_form_is_spam', array( $this, 'is_spam_blacklist' ), 10, 2 );

// Akismet to the rescue
if ( defined( 'AKISMET_VERSION' ) || function_exists( 'akismet_http_post' ) ) {
Expand Down Expand Up @@ -618,6 +620,29 @@ function widget_shortcode_hack( $text ) {

return $text;
}

/**
* Check if a submission matches the Comment Blacklist.
* The Comment Blacklist is a means to moderate discussion, and contact
* forms are 1:1 discussion forums, ripe for abuse by users who are being
* removed from the public discussion.
* Attached to `jetpack_contact_form_is_spam`
*
* @param bool $is_spam
* @param array $form
* @return bool TRUE => spam, FALSE => not spam
*/
function is_spam_blacklist( $is_spam, $form = array() ) {
if ( $is_spam ) {
return $is_spam;
}

if ( wp_blacklist_check( $form['comment_author'], $form['comment_author_email'], $form['comment_author_url'], $form['comment_content'], $form['user_ip'], $form['user_agent'] ) ) {
return true;
}

return false;
}

/**
* Populate an array with all values necessary to submit a NEW contact-form feedback to Akismet.
Expand Down