akismet.php 3.2 KB
Newer Older
Pham Huy committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151
<?php
/**
** Akismet Filter
** Akismet API: http://akismet.com/development/api/
**/

add_filter( 'wpcf7_spam', 'wpcf7_akismet', 10, 1 );

function wpcf7_akismet( $spam ) {
	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'];

	// 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;
		}
	}

	if ( wpcf7_akismet_comment_check( $c ) ) {
		$spam = true;

		$submission = WPCF7_Submission::get_instance();

		$submission->add_spam_log( array(
			'agent' => 'akismet',
			'reason' => __( "Akismet returns a spam response.", 'contact-form-7' ),
		) );
	} else {
		$spam = false;
	}

	return $spam;
}

function wpcf7_akismet_is_available() {
	if ( is_callable( array( 'Akismet', 'get_api_key' ) ) ) {
		return (bool) Akismet::get_api_key();
	}

	return false;
}

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

	$has_akismet_option = false;

	foreach ( (array) $_POST as $key => $val ) {
		if ( '_wpcf7' == substr( $key, 0, 6 )
		or '_wpnonce' == $key ) {
			continue;
		}

		if ( is_array( $val ) ) {
			$val = implode( ', ', wpcf7_array_flatten( $val ) );
		}

		$val = trim( $val );

		if ( 0 == strlen( $val ) ) {
			continue;
		}

		if ( $tags = wpcf7_scan_form_tags( array( 'name' => $key ) ) ) {
			$tag = $tags[0];

			$akismet = $tag->get_option( 'akismet',
				'(author|author_email|author_url)', true );

			if ( $akismet ) {
				$has_akismet_option = true;

				if ( 'author' == $akismet ) {
					$params[$akismet] = trim( $params[$akismet] . ' ' . $val );
					continue;
				} elseif ( '' == $params[$akismet] ) {
					$params[$akismet] = $val;
					continue;
				}
			}
		}

		$params['content'] .= "\n\n" . $val;
	}

	if ( ! $has_akismet_option ) {
		return false;
	}

	$params['content'] = trim( $params['content'] );

	return $params;
}

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 );
}