mirror of
https://github.com/silverstripe/silverstripe-cms
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bfc448fa7f
Fixed whitespace git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@47726 467b73ca-7a2a-4603-9d3b-597d59a354a9
395 lines
11 KiB
PHP
395 lines
11 KiB
PHP
<?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 cms
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* @subpackage
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* @author Alex Potsides, {@link http://www.achingbrain.net http://www.achingbrain.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 PHP5 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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* @version 0.2
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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 Akismet
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{
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private $version = '0.2';
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private $wordPressAPIKey;
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private $blogURL;
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private $comment;
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private $apiPort;
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private $akismetServer;
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private $akismetVersion;
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// This prevents some potentially sensitive information from being sent accross the wire.
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private $ignore = array('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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* @throws Exception An exception is thrown if your API key is invalid.
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* @param string Your WordPress API key.
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* @param string $blogURL The URL of your blog.
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*/
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public function __construct($blogURL, $wordPressAPIKey)
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{
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$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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{
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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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throw new Exception('Invalid API key. Please obtain one from http://wordpress.com/api-keys/');
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}
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}
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private function http_post($request, $host, $path)
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{
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$http_request = "POST " . $path . " HTTP/1.1\r\n";
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$http_request .= "Host: " . $host . "\r\n";
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$http_request .= "Content-Type: application/x-www-form-urlencoded; charset=utf-8\r\n";
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$http_request .= "Content-Length: " . strlen($request) . "\r\n";
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$http_request .= "User-Agent: Akismet PHP5 Class " . $this->version . " | Akismet/1.11\r\n";
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$http_request .= "\r\n";
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$http_request .= $request;
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$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 $sql;
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private function getQueryString()
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{
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foreach($_SERVER as $key => $value)
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{
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if(!in_array($key, $this->ignore))
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{
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if($key == 'REMOTE_ADDR')
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{
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$this->comment[$key] = $this->comment['user_ip'];
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}
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else
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{
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$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 => $data)
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{
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@$query_string .= $key . '=' . urlencode(stripslashes($data)) . '&';
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}
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return $query_string;
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}
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/**
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* Tests for spam.
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*
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* Uses the web service provided by {@link http://www.akismet.com Akismet} to see whether or not the submitted comment is spam. Returns a boolean value.
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*
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* @return bool True if the comment is spam, false if not
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*/
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public function isCommentSpam()
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{
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$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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public function submitSpam()
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{
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$this->http_post($this->getQueryString(), $this->wordPressAPIKey . '.' . $this->akismetServer, '/' . $this->akismetVersion . '/submit-spam');
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}
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/**
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* Submit ham that is incorrectly tagged as spam.
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*
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* Using this function will make you a good citizen as it helps Akismet to learn from its mistakes. This will improve the service for everybody.
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*/
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public function submitHam()
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{
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$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 $userip An IP address. Optional.
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*/
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public function setUserIP($userip)
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{
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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 $referrer The referring page. Optional.
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*/
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public function setReferrer($referrer)
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{
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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 $permalink The URL. Optional.
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*/
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public function setPermalink($permalink)
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{
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$this->comment['permalink'] = $permalink;
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}
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/**
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* The type of comment being submitted.
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*
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* May be blank, comment, trackback, pingback, or a made up value like "registration" or "wiki".
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*/
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public function setCommentType($commentType)
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{
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$this->comment['comment_type'] = $commentType;
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}
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/**
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* The name that the author submitted with the comment.
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*/
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public function setCommentAuthor($commentAuthor)
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{
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$this->comment['comment_author'] = $commentAuthor;
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}
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/**
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* The email address that the author submitted with the comment.
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*
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* The address is assumed to be valid.
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*/
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public function setCommentAuthorEmail($authorEmail)
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{
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$this->comment['comment_author_email'] = $authorEmail;
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}
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/**
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* The URL that the author submitted with the comment.
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*/
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public function setCommentAuthorURL($authorURL)
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{
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$this->comment['comment_author_url'] = $authorURL;
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}
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/**
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* The comment's body text.
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*/
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public function setCommentContent($commentBody)
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{
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$this->comment['comment_content'] = $commentBody;
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}
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/**
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* Defaults to 80
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*/
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public function setAPIPort($apiPort)
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{
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$this->apiPort = $apiPort;
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}
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/**
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* Defaults to rest.akismet.com
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*/
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public function setAkismetServer($akismetServer)
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{
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$this->akismetServer = $akismetServer;
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}
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/**
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* Defaults to '1.1'
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*/
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public function setAkismetVersion($akismetVersion)
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{
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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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* @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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{
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private $host;
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private $port;
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private $request;
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private $response;
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private $responseLength;
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private $errorNumber;
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private $errorString;
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/**
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* @param string $host The host to send/receive data.
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* @param int $port The port on the remote host.
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* @param string $request The data to send.
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* @param int $responseLength The amount of data to read. Defaults to 1160 bytes.
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*/
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public function __construct($host, $port, $request, $responseLength = 1160)
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{
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$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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$this->errorString = '';
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}
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/**
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* Sends the data to the remote host.
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*
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* @throws An exception is thrown if a connection cannot be made to the remote host.
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*/
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public function send()
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{
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$this->response = '';
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$fs = fsockopen($this->host, $this->port, $this->errorNumber, $this->errorString, 3);
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if($this->errorNumber != 0)
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{
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throw new Exception('Error connecting to host: ' . $this->host . ' Error number: ' . $this->errorNumber . ' Error message: ' . $this->errorString);
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}
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if($fs !== false)
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{
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@fwrite($fs, $this->request);
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while(!feof($fs))
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{
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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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public function getResponse()
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{
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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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public function getErrorNumner()
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{
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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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public function getErrorString()
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{
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return $this->errorString;
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}
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}
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?>
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