391 lines
11 KiB
PHP
Executable File
391 lines
11 KiB
PHP
Executable File
<?php
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/**
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* Akismet anti-comment spam service
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*
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* The class in this package allows use of the {@link http://akismet.com Akismet} anti-comment spam service in any PHP5 application.
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*
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* This service performs a number of checks on submitted data and returns whether or not the data is likely to be spam.
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*
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* Please note that in order to use this class, you must have a vaild {@link http://wordpress.com/api-keys/ WordPress API key}. They are free for non/small-profit types and getting one will only take a couple of minutes.
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*
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* For commercial use, please {@link http://akismet.com/commercial/ visit the Akismet commercial licensing page}.
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*
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* Please be aware that this class is PHP5 only. Attempts to run it under PHP4 will most likely fail.
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*
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* See the Akismet class documentation page linked to below for usage information.
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*
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* @package Akismet
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* @author Alex Potsides, {@link http://www.achingbrain.net http://www.achingbrain.net}, Bret Kuhns {@link http://www.miphp.net}
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* @version 0.1
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* @copyright Alex Potsides, {@link http://www.achingbrain.net http://www.achingbrain.net}
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* @license http://www.gnu.org/licenses/gpl.html GNU General Public License
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*/
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/**
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* The Akismet PHP4 Class
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*
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* This class takes the functionality from the Akismet WordPress plugin written by {@link http://photomatt.net/ Matt Mullenweg} and allows it to be integrated into any PHP5 application or website.
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*
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* The original plugin is {@link http://akismet.com/download/ available on the Akismet website}.
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*
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* <b>Usage:</b>
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* <code>
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* $akismet = new Akismet('http://www.example.com/blog/', 'aoeu1aoue');
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* $akismet->setCommentAuthor($name);
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* $akismet->setCommentAuthorEmail($email);
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* $akismet->setCommentAuthorURL($url);
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* $akismet->setCommentContent($comment);
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* $akismet->setPermalink('http://www.example.com/blog/alex/someurl/');
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* if($akismet->isCommentSpam())
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* // store the comment but mark it as spam (in case of a mis-diagnosis)
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* else
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* // store the comment normally
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* </code>
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*
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* @package akismet
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* @name Akismet
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* @version 0.2
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* @author Alex Potsides (converted to PHP4 by Bret Kuhns)
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* @link http://www.achingbrain.net/
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*/
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class Akismet {
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var $version = '0.2';
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var $wordPressAPIKey;
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var $blogURL;
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var $comment;
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var $apiPort;
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var $akismetServer;
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var $akismetVersion;
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// This prevents some potentially sensitive information from being sent accross the wire.
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var $ignore = array(
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'HTTP_COOKIE',
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'HTTP_X_FORWARDED_FOR',
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'HTTP_X_FORWARDED_HOST',
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'HTTP_MAX_FORWARDS',
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'HTTP_X_FORWARDED_SERVER',
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'REDIRECT_STATUS',
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'SERVER_PORT',
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'PATH',
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'DOCUMENT_ROOT',
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'SERVER_ADMIN',
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'QUERY_STRING',
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'PHP_SELF'
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);
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/**
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*
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* @throws Exception An exception is thrown if your API key is invalid.
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* @param
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* string Your WordPress API key.
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* @param string $blogURL
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* The URL of your blog.
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*/
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function __construct($blogURL, $wordPressAPIKey) {
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$this->blogURL = $blogURL;
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$this->wordPressAPIKey = $wordPressAPIKey;
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// Set some default values
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$this->apiPort = 80;
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$this->akismetServer = 'rest.akismet.com';
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$this->akismetVersion = '1.1';
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// Start to populate the comment data
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$this->comment ['blog'] = $blogURL;
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$this->comment ['user_agent'] = $_SERVER ['HTTP_USER_AGENT'];
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$this->comment ['referrer'] = $_SERVER ['HTTP_REFERER'];
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// This is necessary if the server PHP5 is running on has been set up to run PHP4 and
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// PHP5 concurently and is actually running through a separate proxy al a these instructions:
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// http://www.schlitt.info/applications/blog/archives/83_How_to_run_PHP4_and_PHP_5_parallel.html
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// and http://wiki.coggeshall.org/37.html
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// Otherwise the user_ip appears as the IP address of the PHP4 server passing the requests to the
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// PHP5 one...
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$this->comment ['user_ip'] = $_SERVER ['REMOTE_ADDR'] != getenv('SERVER_ADDR') ? $_SERVER ['REMOTE_ADDR'] : getenv('HTTP_X_FORWARDED_FOR');
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// Check to see if the key is valid
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$response = $this->http_post('key=' . $this->wordPressAPIKey . '&blog=' . $this->blogURL, $this->akismetServer, '/' . $this->akismetVersion . '/verify-key');
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if ($response [1] != 'valid') {
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// Whoops, no it's not. Throw an exception as we can't proceed without a valid API key.
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trigger_error('Invalid API key. Please obtain one from http://wordpress.com/api-keys/', E_USER_ERROR);
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}
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}
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function http_post($request, $host, $path) {
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$http_request = "POST " . $path . " HTTP/1.0\r\n" . //
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"Host: " . $host . "\r\n" . //
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"Content-Type: application/x-www-form-urlencoded; charset=utf-8\r\n" . //
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"Content-Length: " . strlen($request) . "\r\n" . //
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"User-Agent: Akismet PHP5 Class " . $this->version . " | Akismet/1.11\r\n" . //
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"\r\n" . //
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$request;
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$socketWriteRead = new SocketWriteRead($host, $this->apiPort, $http_request);
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$socketWriteRead->send();
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return explode("\r\n\r\n", $socketWriteRead->getResponse(), 2);
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}
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// Formats the data for transmission echo $sql;
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function getQueryString() {
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foreach ($_SERVER as $key => $value) {
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if (!in_array($key, $this->ignore)) {
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if ($key == 'REMOTE_ADDR') {
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$this->comment [$key] = $this->comment ['user_ip'];
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} else {
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$this->comment [$key] = $value;
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}
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}
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}
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$query_string = '';
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foreach ($this->comment as $key => $data) {
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@$query_string .= $key . '=' . urlencode(stripslashes($data)) . '&';
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}
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return $query_string;
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}
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/**
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* Tests for spam.
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*
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* Uses the web service provided by {@link http://www.akismet.com Akismet} to see whether or not the submitted comment is spam. Returns a boolean value.
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*
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* @return bool True if the comment is spam, false if not
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*/
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function isSpam() {
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$response = $this->http_post($this->getQueryString(), $this->wordPressAPIKey . '.rest.akismet.com', '/' . $this->akismetVersion . '/comment-check');
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return ($response [1] == 'true');
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}
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/**
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* Submit spam that is incorrectly tagged as ham.
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*
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* Using this function will make you a good citizen as it helps Akismet to learn from its mistakes. This will improve the service for everybody.
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*/
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function submitSpam() {
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$this->http_post($this->getQueryString(), $this->wordPressAPIKey . '.' . $this->akismetServer, '/' . $this->akismetVersion . '/submit-spam');
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}
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/**
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* Submit ham that is incorrectly tagged as spam.
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*
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* Using this function will make you a good citizen as it helps Akismet to learn from its mistakes. This will improve the service for everybody.
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*/
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function submitHam() {
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$this->http_post($this->getQueryString(), $this->wordPressAPIKey . '.' . $this->akismetServer, '/' . $this->akismetVersion . '/submit-ham');
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}
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/**
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* To override the user IP address when submitting spam/ham later on
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*
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* @param string $userip
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* An IP address. Optional.
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*/
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function setUserIP($userip) {
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$this->comment ['user_ip'] = $userip;
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}
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/**
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* To override the referring page when submitting spam/ham later on
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*
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* @param string $referrer
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* The referring page. Optional.
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*/
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function setReferrer($referrer) {
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$this->comment ['referrer'] = $referrer;
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}
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/**
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* A permanent URL referencing the blog post the comment was submitted to.
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*
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* @param string $permalink
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* The URL. Optional.
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*/
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function setPermalink($permalink) {
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$this->comment ['permalink'] = $permalink;
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}
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/**
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* The type of comment being submitted.
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*
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* May be blank, comment, trackback, pingback, or a made up value like "registration" or "wiki".
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*/
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function setType($commentType) {
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$this->comment ['comment_type'] = $commentType;
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}
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/**
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* The name that the author submitted with the comment.
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*/
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function setAuthor($commentAuthor) {
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$this->comment ['comment_author'] = $commentAuthor;
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}
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/**
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* The email address that the author submitted with the comment.
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*
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* The address is assumed to be valid.
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*/
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function setAuthorEmail($authorEmail) {
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$this->comment ['comment_author_email'] = $authorEmail;
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}
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/**
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* The URL that the author submitted with the comment.
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*/
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function setAuthorURL($authorURL) {
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$this->comment ['comment_author_url'] = $authorURL;
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}
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/**
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* The comment's body text.
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*/
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function setContent($commentBody) {
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$this->comment ['comment_content'] = $commentBody;
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}
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/**
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* Defaults to 80
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*/
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function setAPIPort($apiPort) {
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$this->apiPort = $apiPort;
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}
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/**
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* Defaults to rest.akismet.com
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*/
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function setAkismetServer($akismetServer) {
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$this->akismetServer = $akismetServer;
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}
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/**
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* Defaults to '1.1'
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*/
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function setAkismetVersion($akismetVersion) {
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$this->akismetVersion = $akismetVersion;
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}
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}
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/**
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* Utility class used by Akismet
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*
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* This class is used by Akismet to do the actual sending and receiving of data. It opens a connection to a remote host, sends some data and the reads the response and makes it available to the calling program.
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*
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* The code that makes up this class originates in the Akismet WordPress plugin, which is {@link http://akismet.com/download/ available on the Akismet website}.
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*
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* N.B. It is not necessary to call this class directly to use the Akismet class. This is included here mainly out of a sense of completeness.
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*
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* @package akismet
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* @name SocketWriteRead
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* @version 0.1
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* @author Alex Potsides
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* @link http://www.achingbrain.net/
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*/
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class SocketWriteRead {
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var $host;
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var $port;
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var $request;
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var $response;
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var $responseLength;
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var $errorNumber;
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var $errorString;
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/**
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*
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* @param string $host
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* The host to send/receive data.
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* @param int $port
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* The port on the remote host.
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* @param string $request
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* The data to send.
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* @param int $responseLength
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* The amount of data to read. Defaults to 1160 bytes.
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*/
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function __construct($host, $port, $request, $responseLength = 1160) {
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$this->host = $host;
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$this->port = $port;
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$this->request = $request;
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$this->responseLength = $responseLength;
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$this->errorNumber = 0;
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$this->errorString = '';
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}
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/**
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* Sends the data to the remote host.
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*
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* @throws An exception is thrown if a connection cannot be made to the remote host.
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*/
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function send() {
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$this->response = '';
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$fs = fsockopen($this->host, $this->port, $this->errorNumber, $this->errorString, AKISMET_TIMEOUT);
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if ($this->errorNumber != 0) {
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trigger_error('Error connecting to host: ' . $this->host . ' Error number: ' . $this->errorNumber . ' Error message: ' . $this->errorString, E_USER_ERROR);
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}
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if ($fs !== false) {
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@fwrite($fs, $this->request);
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while (!feof($fs)) {
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$this->response .= fgets($fs, $this->responseLength);
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}
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fclose($fs);
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}
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}
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/**
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* Returns the server response text
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*
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* @return string
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*/
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function getResponse() {
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return $this->response;
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}
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/**
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* Returns the error number
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*
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* If there was no error, 0 will be returned.
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*
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* @return int
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*/
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function getErrorNumber() {
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return $this->errorNumber;
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}
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/**
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* Returns the error string
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*
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* If there was no error, an empty string will be returned.
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*
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* @return string
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*/
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function getErrorString() {
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return $this->errorString;
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}
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}
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?>
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