akismet.php

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<?php
/*
Plugin Name: Akismet
Plugin URI: http://akismet.com/
Description: Akismet checks your comments against the Akismet web service to see if they look like spam or not. You need a <a href="http://wordpress.com/api-keys/">WordPress.com API key</a> to use it. You can review the spam it catches under "Comments." To show off your Akismet stats just put <code>&lt;?php akismet_counter(); ?&gt;</code> in your template. See also: <a href="http://wordpress.org/extend/plugins/stats/">WP Stats plugin</a>.
Version: 2.2.3
Author: Matt Mullenweg
Author URI: http://ma.tt/
*/

// If you hardcode a WP.com API key here, all key config screens will be hidden
$wpcom_api_key = '';

function akismet_init() {
	global $wpcom_api_key, $akismet_api_host, $akismet_api_port;

	if ( $wpcom_api_key )
		$akismet_api_host = $wpcom_api_key . '.rest.akismet.com';
	else
		$akismet_api_host = get_option('wordpress_api_key') . '.rest.akismet.com';

	$akismet_api_port = 80;
	add_action('admin_menu', 'akismet_config_page');
	add_action('admin_menu', 'akismet_stats_page');
}
add_action('init', 'akismet_init');

function akismet_admin_init() {
	if ( function_exists( 'get_plugin_page_hook' ) )
		$hook = get_plugin_page_hook( 'akismet-stats-display', 'index.php' );
	else
		$hook = 'dashboard_page_akismet-stats-display';
	add_action('admin_head-'.$hook, 'akismet_stats_script');
}
add_action('admin_init', 'akismet_admin_init');

if ( !function_exists('wp_nonce_field') ) {
	function akismet_nonce_field($action = -1) { return; }
	$akismet_nonce = -1;
} else {
	function akismet_nonce_field($action = -1) { return wp_nonce_field($action); }
	$akismet_nonce = 'akismet-update-key';
}

if ( !function_exists('number_format_i18n') ) {
	function number_format_i18n( $number, $decimals = null ) { return number_format( $number, $decimals ); }
}

function akismet_config_page() {
	if ( function_exists('add_submenu_page') )
		add_submenu_page('plugins.php', __('Akismet Configuration'), __('Akismet Configuration'), 'manage_options', 'akismet-key-config', 'akismet_conf');

}

function akismet_conf() {
	global $akismet_nonce, $wpcom_api_key;

	if ( isset($_POST['submit']) ) {
		if ( function_exists('current_user_can') && !current_user_can('manage_options') )
			die(__('Cheatin&#8217; uh?'));

		check_admin_referer( $akismet_nonce );
		$key = preg_replace( '/[^a-h0-9]/i', '', $_POST['key'] );

		if ( empty($key) ) {
			$key_status = 'empty';
			$ms[] = 'new_key_empty';
			delete_option('wordpress_api_key');
		} else {
			$key_status = akismet_verify_key( $key );
		}

		if ( $key_status == 'valid' ) {
			update_option('wordpress_api_key', $key);
			$ms[] = 'new_key_valid';
		} else if ( $key_status == 'invalid' ) {
			$ms[] = 'new_key_invalid';
		} else if ( $key_status == 'failed' ) {
			$ms[] = 'new_key_failed';
		}

		if ( isset( $_POST['akismet_discard_month'] ) )
			update_option( 'akismet_discard_month', 'true' );
		else
			update_option( 'akismet_discard_month', 'false' );
	}

	if ( $key_status != 'valid' ) {
		$key = get_option('wordpress_api_key');
		if ( empty( $key ) ) {
			if ( $key_status != 'failed' ) {
				if ( akismet_verify_key( '1234567890ab' ) == 'failed' )
					$ms[] = 'no_connection';
				else
					$ms[] = 'key_empty';
			}
			$key_status = 'empty';
		} else {
			$key_status = akismet_verify_key( $key );
		}
		if ( $key_status == 'valid' ) {
			$ms[] = 'key_valid';
		} else if ( $key_status == 'invalid' ) {
			delete_option('wordpress_api_key');
			$ms[] = 'key_empty';
		} else if ( !empty($key) && $key_status == 'failed' ) {
			$ms[] = 'key_failed';
		}
	}

	$messages = array(
		'new_key_empty' => array('color' => 'aa0', 'text' => __('Your key has been cleared.')),
		'new_key_valid' => array('color' => '2d2', 'text' => __('Your key has been verified. Happy blogging!')),
		'new_key_invalid' => array('color' => 'd22', 'text' => __('The key you entered is invalid. Please double-check it.')),
		'new_key_failed' => array('color' => 'd22', 'text' => __('The key you entered could not be verified because a connection to akismet.com could not be established. Please check your server configuration.')),
		'no_connection' => array('color' => 'd22', 'text' => __('There was a problem connecting to the Akismet server. Please check your server configuration.')),
		'key_empty' => array('color' => 'aa0', 'text' => sprintf(__('Please enter an API key. (<a href="%s" style="color:#fff">Get your key.</a>)'), 'http://wordpress.com/profile/')),
		'key_valid' => array('color' => '2d2', 'text' => __('This key is valid.')),
		'key_failed' => array('color' => 'aa0', 'text' => __('The key below was previously validated but a connection to akismet.com can not be established at this time. Please check your server configuration.')));
?>
<?php if ( !empty($_POST ) ) : ?>
<div id="message" class="updated fade"><p><strong><?php _e('Options saved.') ?></strong></p></div>
<?php endif; ?>
<div class="wrap">
<h2><?php _e('Akismet Configuration'); ?></h2>
<div class="narrow">
<form action="" method="post" id="akismet-conf" style="margin: auto; width: 400px; ">
<?php if ( !$wpcom_api_key ) { ?>
	<p><?php printf(__('For many people, <a href="%1$s">Akismet</a> will greatly reduce or even completely eliminate the comment and trackback spam you get on your site. If one does happen to get through, simply mark it as "spam" on the moderation screen and Akismet will learn from the mistakes. If you don\'t have a WordPress.com account yet, you can get one at <a href="%2$s">WordPress.com</a>.'), 'http://akismet.com/', 'http://wordpress.com/api-keys/'); ?></p>

<?php akismet_nonce_field($akismet_nonce) ?>
<h3><label for="key"><?php _e('WordPress.com API Key'); ?></label></h3>
<?php foreach ( $ms as $m ) : ?>
	<p style="padding: .5em; background-color: #<?php echo $messages[$m]['color']; ?>; color: #fff; font-weight: bold;"><?php echo $messages[$m]['text']; ?></p>
<?php endforeach; ?>
<p><input id="key" name="key" type="text" size="15" maxlength="12" value="<?php echo get_option('wordpress_api_key'); ?>" style="font-family: 'Courier New', Courier, mono; font-size: 1.5em;" /> (<?php _e('<a href="http://faq.wordpress.com/2005/10/19/api-key/">What is this?</a>'); ?>)</p>
<?php if ( $invalid_key ) { ?>
<h3><?php _e('Why might my key be invalid?'); ?></h3>
<p><?php _e('This can mean one of two things, either you copied the key wrong or that the plugin is unable to reach the Akismet servers, which is most often caused by an issue with your web host around firewalls or similar.'); ?></p>
<?php } ?>
<?php } ?>
<p><label><input name="akismet_discard_month" id="akismet_discard_month" value="true" type="checkbox" <?php if ( get_option('akismet_discard_month') == 'true' ) echo ' checked="checked" '; ?> /> <?php _e('Automatically discard spam comments on posts older than a month.'); ?></label></p>
	<p class="submit"><input type="submit" name="submit" value="<?php _e('Update options &raquo;'); ?>" /></p>
</form>
</div>
</div>
<?php
}

function akismet_stats_page() {
	if ( function_exists('add_submenu_page') )
		add_submenu_page('index.php', __('Akismet Stats'), __('Akismet Stats'), 'manage_options', 'akismet-stats-display', 'akismet_stats_display');

}

function akismet_stats_script() {
	?>
<script type="text/javascript">
function resizeIframe() {
    var height = document.documentElement.clientHeight;
    height -= document.getElementById('akismet-stats-frame').offsetTop;
    height += 100; // magic padding
    
    document.getElementById('akismet-stats-frame').style.height = height +"px";
    
};
function resizeIframeInit() {
	document.getElementById('akismet-stats-frame').onload = resizeIframe;
	window.onresize = resizeIframe;
}
addLoadEvent(resizeIframeInit);
</script><?php
}


function akismet_stats_display() {
	global $akismet_api_host, $akismet_api_port, $wpcom_api_key;
	$blog = urlencode( get_option('home') );
	$url = "http://".get_option('wordpress_api_key').".web.akismet.com/1.0/user-stats.php?blog={$blog}";
	?>
	<div class="wrap">
	<iframe src="<?php echo $url; ?>" width="100%" height="100%" frameborder="0" id="akismet-stats-frame"></iframe>
	</div>
	<?php
}

function akismet_verify_key( $key ) {
	global $akismet_api_host, $akismet_api_port, $wpcom_api_key;
	$blog = urlencode( get_option('home') );
	if ( $wpcom_api_key )
		$key = $wpcom_api_key;
	$response = akismet_http_post("key=$key&blog=$blog", 'rest.akismet.com', '/1.1/verify-key', $akismet_api_port);
	if ( !is_array($response) || !isset($response[1]) || $response[1] != 'valid' && $response[1] != 'invalid' )
		return 'failed';
	return $response[1];
}

if ( !get_option('wordpress_api_key') && !$wpcom_api_key && !isset($_POST['submit']) ) {
	function akismet_warning() {
		echo "
		<div id='akismet-warning' class='updated fade'><p><strong>".__('Akismet is almost ready.')."</strong> ".sprintf(__('You must <a href="%1$s">enter your WordPress.com API key</a> for it to work.'), "plugins.php?page=akismet-key-config")."</p></div>
		";
	}
	add_action('admin_notices', 'akismet_warning');
	return;
}

// Returns array with headers in $response[0] and body in $response[1]
function akismet_http_post($request, $host, $path, $port = 80) {
	global $wp_version;

	$http_request  = "POST $path HTTP/1.0\r\n";
	$http_request .= "Host: $host\r\n";
	$http_request .= "Content-Type: application/x-www-form-urlencoded; charset=" . get_option('blog_charset') . "\r\n";
	$http_request .= "Content-Length: " . strlen($request) . "\r\n";
	$http_request .= "User-Agent: WordPress/$wp_version | Akismet/2.0\r\n";
	$http_request .= "\r\n";
	$http_request .= $request;

	$response = '';
	if( false != ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
		fwrite($fs, $http_request);

		while ( !feof($fs) )
			$response .= fgets($fs, 1160); // One TCP-IP packet
		fclose($fs);
		$response = explode("\r\n\r\n", $response, 2);
	}
	return $response;
}

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

	$comment['user_ip']    = preg_replace( '/[^0-9., ]/', '', $_SERVER['REMOTE_ADDR'] );
	$comment['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
	$comment['referrer']   = $_SERVER['HTTP_REFERER'];
	$comment['blog']       = get_option('home');

	$ignore = array( 'HTTP_COOKIE' );

	foreach ( $_SERVER as $key => $value )
		if ( !in_array( $key, $ignore ) )
			$comment["$key"] = $value;

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

	$response = akismet_http_post($query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port);
	if ( 'true' == $response[1] ) {
		add_filter('pre_comment_approved', create_function('$a', 'return \'spam\';'));
		update_option( 'akismet_spam_count', get_option('akismet_spam_count') + 1 );

		do_action( 'akismet_spam_caught' );

		$post = get_post( $comment['comment_post_ID'] );
		$last_updated = strtotime( $post->post_modified_gmt );
		$diff = time() - $last_updated;
		$diff = $diff / 86400;

		if ( $post->post_type == 'post' && $diff > 30 && get_option( 'akismet_discard_month' ) == 'true' )
			die;
	}
	akismet_delete_old();
	return $comment;
}

function akismet_delete_old() {
	global $wpdb;
	$now_gmt = current_time('mysql', 1);
	$wpdb->query("DELETE FROM $wpdb->comments WHERE DATE_SUB('$now_gmt', INTERVAL 15 DAY) > comment_date_gmt AND comment_approved = 'spam'");
	$n = mt_rand(1, 5000);
	if ( $n == 11 ) // lucky number
		$wpdb->query("OPTIMIZE TABLE $wpdb->comments");
}

function akismet_submit_nonspam_comment ( $comment_id ) {
	global $wpdb, $akismet_api_host, $akismet_api_port;
	$comment_id = (int) $comment_id;

	$comment = $wpdb->get_row("SELECT * FROM $wpdb->comments WHERE comment_ID = '$comment_id'");
	if ( !$comment ) // it was deleted
		return;
	$comment->blog = get_option('home');
	$query_string = '';
	foreach ( $comment as $key => $data )
		$query_string .= $key . '=' . urlencode( stripslashes($data) ) . '&';
	$response = akismet_http_post($query_string, $akismet_api_host, "/1.1/submit-ham", $akismet_api_port);
}

function akismet_submit_spam_comment ( $comment_id ) {
	global $wpdb, $akismet_api_host, $akismet_api_port;
	$comment_id = (int) $comment_id;

	$comment = $wpdb->get_row("SELECT * FROM $wpdb->comments WHERE comment_ID = '$comment_id'");
	if ( !$comment ) // it was deleted
		return;
	if ( 'spam' != $comment->comment_approved )
		return;
	$comment->blog = get_option('home');
	$query_string = '';
	foreach ( $comment as $key => $data )
		$query_string .= $key . '=' . urlencode( stripslashes($data) ) . '&';