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<?php
/**
** Akismet Filter
** Akismet API: http://akismet.com/development/api/
**/

add_filter( 'wpcf7_spam', 'wpcf7_akismet' );

function wpcf7_akismet( $spam ) {
	if ( $spam )
		return $spam;

if ( ! function_exists( 'akismet_get_key' ) || ! akismet_get_key() )
		return false;

if ( ! $params = wpcf7_akismet_submitted_params() )
		return false;

$c = array();

if ( ! empty( $params['author'] ) )
		$c['comment_author'] = $params['author'];

if ( ! empty( $params['author_email'] ) )
		$c['comment_author_email'] = $params['author_email'];

if ( ! empty( $params['author_url'] ) )
		$c['comment_author_url'] = $params['author_url'];

if ( ! empty( $params['content'] ) )
		$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'] = preg_replace( '/[^0-9., ]/', '', $_SERVER['REMOTE_ADDR'] );
	$c['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
	$c['referrer'] = $_SERVER['HTTP_REFERER'];

// http://blog.akismet.com/2012/06/19/pro-tip-tell-us-your-comment_type/
	$c['comment_type'] = 'contact-form';

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;
	}

return wpcf7_akismet_comment_check( $c );
}

function wpcf7_akismet_submitted_params() {
	$params = array(
		'author' => '',
		'author_email' => '',
		'author_url' => '' );

$content = '';

$fes = wpcf7_scan_shortcode();

foreach ( $fes as $fe ) {
		if ( ! isset( $fe['name'] ) || ! isset( $_POST[$fe['name']] ) )
			continue;

$value = $_POST[$fe['name']];

if ( is_array( $value ) )
			$value = implode( ', ', wpcf7_array_flatten( $value ) );

$value = trim( $value );

$options = (array) $fe['options'];

if ( preg_grep( '%^akismet:author$%', $options ) ) {
			$params['author'] = trim( $params['author'] . ' ' . $value );

} elseif ( preg_grep( '%^akismet:author_email$%', $options ) ) {
			if ( '' == $params['author_email'] )
				$params['author_email'] = $value;

} elseif ( preg_grep( '%^akismet:author_url$%', $options ) ) {
			if ( '' == $params['author_url'] )
				$params['author_url'] = $value;
		}

$content = trim( $content . "\n\n" . $value );
	}

$params = array_filter( $params );

if ( ! $params )
		return false;

$params['content'] = $content;

return $params;
}

function wpcf7_akismet_comment_check( $comment ) {
	global $akismet_api_host, $akismet_api_port;

$spam = false;
	$query_string = '';

foreach ( $comment as $key => $data )
		$query_string .= $key . '=' . urlencode( stripslashes( (string) $data ) ) . '&';

$response = akismet_http_post( $query_string,
		$akismet_api_host, '/1.1/comment-check', $akismet_api_port );

if ( 'true' == $response[1] )
		$spam = true;

if ( $contact_form = wpcf7_get_current_contact_form() )
		$contact_form->akismet = array( 'comment' => $comment, 'spam' => $spam );

return apply_filters( 'wpcf7_akismet_comment_check', $spam, $comment );
}