357 lines
8.1 KiB
PHP
357 lines
8.1 KiB
PHP
<?php
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/**
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* 01.26.2006 12:29:28est
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*
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* Akismet PHP4 class
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*
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* <b>Usage</b>
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* <code>
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* $comment = array(
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* 'author' => 'viagra-test-123',
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* 'email' => 'test@example.com',
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* 'website' => 'http://www.example.com/',
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* 'body' => 'This is a test comment',
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* 'permalink' => 'http://yourdomain.com/yourblogpost.url',
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* );
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*
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* $akismet = new Akismet('http://www.yourdomain.com/', 'YOUR_WORDPRESS_API_KEY', $comment);
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*
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* if($akismet->isError()) {
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* echo"Couldn't connected to Akismet server!";
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* } else {
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* if($akismet->isSpam()) {
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* echo"Spam detected";
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* } else {
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* echo"yay, no spam!";
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* }
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* }
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* </code>
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*
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* @author Bret Kuhns {@link www.miphp.net}
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* @link http://www.miphp.net/blog/view/php4_akismet_class/
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* @version 0.3.3
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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// Error constants
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define("AKISMET_SERVER_NOT_FOUND", 0);
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define("AKISMET_RESPONSE_FAILED", 1);
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define("AKISMET_INVALID_KEY", 2);
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// Base class to assist in error handling between Akismet classes
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class AkismetObject {
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var $errors = array();
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/**
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* Add a new error to the errors array in the object
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*
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* @param String $name A name (array key) for the error
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* @param String $string The error message
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* @return void
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*/
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// Set an error in the object
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function setError($name, $message) {
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$this->errors[$name] = $message;
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}
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/**
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* Return a specific error message from the errors array
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*
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* @param String $name The name of the error you want
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* @return mixed Returns a String if the error exists, a false boolean if it does not exist
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*/
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function getError($name) {
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if($this->isError($name)) {
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return $this->errors[$name];
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} else {
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return false;
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}
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}
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/**
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* Return all errors in the object
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*
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* @return String[]
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*/
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function getErrors() {
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return (array)$this->errors;
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}
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/**
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* Check if a certain error exists
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*
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* @param String $name The name of the error you want
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* @return boolean
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*/
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function isError($name) {
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return isset($this->errors[$name]);
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}
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/**
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* Check if any errors exist
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*
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* @return boolean
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*/
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function errorsExist() {
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return (count($this->errors) > 0);
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}
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}
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// Used by the Akismet class to communicate with the Akismet service
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class AkismetHttpClient extends AkismetObject {
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var $akismetVersion = '1.1';
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var $con;
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var $host;
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var $port;
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var $apiKey;
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var $blogUrl;
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var $errors = array();
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// Constructor
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function AkismetHttpClient($host, $blogUrl, $apiKey, $port = 80) {
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$this->host = $host;
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$this->port = $port;
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$this->blogUrl = $blogUrl;
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$this->apiKey = $apiKey;
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}
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// Use the connection active in $con to get a response from the server and return that response
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function getResponse($request, $path, $type = "post", $responseLength = 1160) {
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$this->_connect();
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if($this->con && !$this->isError(AKISMET_SERVER_NOT_FOUND)) {
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$request =
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strToUpper($type)." /{$this->akismetVersion}/$path HTTP/1.1\r\n" .
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"Host: ".((!empty($this->apiKey)) ? $this->apiKey."." : null)."{$this->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($request)."\r\n" .
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"User-Agent: Akismet PHP4 Class\r\n" .
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"\r\n" .
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$request
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;
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$response = "";
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@fwrite($this->con, $request);
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while(!feof($this->con)) {
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$response .= @fgets($this->con, $responseLength);
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}
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$response = explode("\r\n\r\n", $response, 2);
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return $response[1];
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} else {
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$this->setError(AKISMET_RESPONSE_FAILED, "The response could not be retrieved.");
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}
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$this->_disconnect();
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}
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// Connect to the Akismet server and store that connection in the instance variable $con
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function _connect() {
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if(!($this->con = @fsockopen($this->host, $this->port))) {
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$this->setError(AKISMET_SERVER_NOT_FOUND, "Could not connect to akismet server.");
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}
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}
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// Close the connection to the Akismet server
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function _disconnect() {
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@fclose($this->con);
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}
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}
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// The controlling class. This is the ONLY class the user should instantiate in
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// order to use the Akismet service!
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class Akismet extends AkismetObject {
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var $apiPort = 80;
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var $akismetServer = 'rest.akismet.com';
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var $akismetVersion = '1.1';
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var $http;
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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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var $blogUrl = "";
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var $apiKey = "";
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var $comment = array();
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/**
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* Constructor
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*
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* Set instance variables, connect to Akismet, and check API key
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*
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* @param String $blogUrl The URL to your own blog
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* @param String $apiKey Your wordpress API key
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* @param String[] $comment A formatted comment array to be examined by the Akismet service
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*/
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function Akismet($blogUrl, $apiKey, $comment) {
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$this->blogUrl = $blogUrl;
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$this->apiKey = $apiKey;
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// Populate the comment array with information needed by Akismet
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$this->comment = $comment;
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$this->_formatCommentArray();
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if(!isset($this->comment['user_ip'])) {
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$this->comment['user_ip'] = ($_SERVER['REMOTE_ADDR'] != getenv('SERVER_ADDR')) ? $_SERVER['REMOTE_ADDR'] : getenv('HTTP_X_FORWARDED_FOR');
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}
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if(!isset($this->comment['user_agent'])) {
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$this->comment['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
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}
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if(!isset($this->comment['referrer'])) {
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$this->comment['referrer'] = $_SERVER['HTTP_REFERER'];
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}
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$this->comment['blog'] = $blogUrl;
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// Connect to the Akismet server and populate errors if they exist
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$this->http = new AkismetHttpClient($this->akismetServer, $blogUrl, $apiKey);
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if($this->http->errorsExist()) {
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$this->errors = array_merge($this->errors, $this->http->getErrors());
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}
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// Check if the API key is valid
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if(!$this->_isValidApiKey($apiKey)) {
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$this->setError(AKISMET_INVALID_KEY, "Your Akismet API key is not valid.");
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}
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}
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/**
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* Query the Akismet and determine if the comment is spam or not
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*
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* @return boolean
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*/
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function isSpam() {
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$response = $this->http->getResponse($this->_getQueryString(), 'comment-check');
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return ($response == "true");
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}
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/**
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* Submit this comment as an unchecked spam to the Akismet server
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*
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* @return void
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*/
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function submitSpam() {
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$this->http->getResponse($this->_getQueryString(), 'submit-spam');
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}
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/**
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* Submit a false-positive comment as "ham" to the Akismet server
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*
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* @return void
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*/
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function submitHam() {
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$this->http->getResponse($this->_getQueryString(), 'submit-ham');
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}
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/**
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* Check with the Akismet server to determine if the API key is valid
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*
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* @access Protected
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* @param String $key The Wordpress API key passed from the constructor argument
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* @return boolean
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*/
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function _isValidApiKey($key) {
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$keyCheck = $this->http->getResponse("key=".$this->apiKey."&blog=".$this->blogUrl, 'verify-key');
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return ($keyCheck == "valid");
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}
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/**
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* Format the comment array in accordance to the Akismet API
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*
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* @access Protected
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* @return void
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*/
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function _formatCommentArray() {
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$format = array(
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'type' => 'comment_type',
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'author' => 'comment_author',
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'email' => 'comment_author_email',
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'website' => 'comment_author_url',
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'body' => 'comment_content'
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);
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foreach($format as $short => $long) {
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if(isset($this->comment[$short])) {
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$this->comment[$long] = $this->comment[$short];
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unset($this->comment[$short]);
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}
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}
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}
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/**
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* Build a query string for use with HTTP requests
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*
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* @access Protected
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* @return String
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*/
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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 => $data) {
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if(is_string($data)) {
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$query_string .= $key . '=' . urlencode(stripslashes($data)) . '&';
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}
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}
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return $query_string;
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}
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}
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?>
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