<?php
/**
** Akismet Filter
** Akismet API: http://akismet.com/development/api/
**/
add_filter( 'wpcf7_spam', 'wpcf7_akismet', 10, 2 );
function wpcf7_akismet( $spam, $submission ) {
if ( $spam ) {
return $spam;
}
if ( ! wpcf7_akismet_is_available() ) {
return false;
}
if ( ! $params = wpcf7_akismet_submitted_params() ) {
return false;
}
$c = array();
$c['comment_author'] = $params['author'];
$c['comment_author_email'] = $params['author_email'];
$c['comment_author_url'] = $params['author_url'];
$c['comment_content'] = $params['content'];
$c['blog'] = get_option( 'home' );
$c['blog_lang'] = get_locale();
$c['blog_charset'] = get_option( 'blog_charset' );
$c['user_ip'] = $_SERVER['REMOTE_ADDR'];
$c['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
$c['referrer'] = $_SERVER['HTTP_REFERER'];
$c['comment_type'] = 'contact-form';
$datetime = date_create_immutable(
'@' . $submission->get_meta( 'timestamp' )
);
if ( $datetime ) {
$c['comment_date_gmt'] = $datetime->format( DATE_ATOM );
}
if ( $permalink = get_permalink() ) {
$c['permalink'] = $permalink;
}
$ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
foreach ( $_SERVER as $key => $value ) {
if ( ! in_array( $key, (array) $ignore ) ) {
$c["$key"] = $value;
}
}
$c = apply_filters( 'wpcf7_akismet_parameters', $c );
if ( wpcf7_akismet_comment_check( $c ) ) {
$spam = true;
$submission->add_spam_log( array(
'agent' => 'akismet',
'reason' => __( "Akismet returns a spam response.", 'contact-form-7' ),
) );
} else {
$spam = false;
}
return $spam;
}
/**
* Returns true if Akismet is active and has a valid API key.
*/
function wpcf7_akismet_is_available() {
if ( is_callable( array( 'Akismet', 'get_api_key' ) ) ) {
return (bool) Akismet::get_api_key();
}
return false;
}
/**
* Returns an array of parameters based on the current form submission.
* Returns false if Akismet is not active on the contact form.
*/
function wpcf7_akismet_submitted_params() {
$akismet_tags = array_filter(
wpcf7_scan_form_tags(),
function ( $tag ) {
$akismet_option = $tag->get_option( 'akismet',
'(author|author_email|author_url)',
true
);
return (bool) $akismet_option;
}
);
if ( ! $akismet_tags ) { // Akismet is not active on this contact form.
return false;
}
$params = array(
'author' => '',
'author_email' => '',
'author_url' => '',
'content' => '',
);
foreach ( (array) $_POST as $key => $val ) {
if ( '_wpcf7' == substr( $key, 0, 6 )
or '_wpnonce' == $key ) {
continue;
}
$vals = array_filter(
wpcf7_array_flatten( $val ),
function ( $val ) {
return '' !== trim( $val );
}
);
if ( empty( $vals ) ) {
continue;
}
if ( $tags = wpcf7_scan_form_tags( array( 'name' => $key ) ) ) {
$tag = $tags[0];
$akismet_option = $tag->get_option( 'akismet',
'(author|author_email|author_url)',
true
);
if ( 'author' === $akismet_option ) {
$params['author'] = sprintf(
'%s %s',
$params['author'],
implode( ' ', $vals )
);
continue;
}
if ( 'author_email' === $akismet_option
and '' === $params['author_email'] ) {
$params['author_email'] = $vals[0];
continue;
}
if ( 'author_url' === $akismet_option
and '' === $params['author_url'] ) {
$params['author_url'] = $vals[0];
continue;
}
$vals = array_filter(
$vals,
function ( $val ) use ( $tag ) {
if ( wpcf7_form_tag_supports( $tag->type, 'selectable-values' )
and in_array( $val, $tag->labels ) ) {
return false;
} else {
return true;
}
}
);
}
if ( $vals ) {
$params['content'] .= "\n\n" . implode( ', ', $vals );
}
}
$params = array_map( 'trim', $params );
return $params;
}
/**
* Sends data to Akismet.
*
* @param array $comment Submission and environment data.
* @return bool True if Akismet called it spam, or false otherwise.
*/
function wpcf7_akismet_comment_check( $comment ) {
$spam = false;
$query_string = wpcf7_build_query( $comment );
if ( is_callable( array( 'Akismet', 'http_post' ) ) ) {
$response = Akismet::http_post( $query_string, 'comment-check' );
} else {
return $spam;
}
if ( 'true' == $response[1] ) {
$spam = true;
}
if ( $submission = WPCF7_Submission::get_instance() ) {
$submission->akismet = array( 'comment' => $comment, 'spam' => $spam );
}
return apply_filters( 'wpcf7_akismet_comment_check', $spam, $comment );
}