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<?php
// a PHP client library for pubsubhubbub
// as defined at http://code.google.com/p/pubsubhubbub/
// written by Josh Fraser | joshfraser.com | josh@eventvue.com
// Released under Apache License 2.0
class Publisher {
protected $hub_url;
protected $last_response;
// create a new Publisher
public function __construct($hub_url) {
if (!isset($hub_url))
throw new Exception('Please specify a hub url');
if (!preg_match("|^https?://|i",$hub_url))
throw new Exception('The specified hub url does not appear to be valid: '.$hub_url);
$this->hub_url = $hub_url;
}
// accepts either a single url or an array of urls
public function publish_update($topic_urls, $http_function = false) {
if (!isset($topic_urls))
throw new Exception('Please specify a topic url');
// check that we're working with an array
if (!is_array($topic_urls)) {
$topic_urls = array($topic_urls);
}
// set the mode to publish
$post_string = "hub.mode=publish";
// loop through each topic url
foreach ($topic_urls as $topic_url) {
// lightweight check that we're actually working w/ a valid url
if (!preg_match("|^https?://|i",$topic_url))
throw new Exception('The specified topic url does not appear to be valid: '.$topic_url);
// append the topic url parameters
$post_string .= "&hub.url=".urlencode($topic_url);
}
// make the http post request and return true/false
// easy to over-write to use your own http function
if ($http_function)
return $http_function($this->hub_url,$post_string);
else
return $this->http_post($this->hub_url,$post_string);
}
// returns any error message from the latest request
public function last_response() {
return $this->last_response;
}
// default http function that uses curl to post to the hub endpoint
private function http_post($url, $post_string) {
// add any additional curl options here
$options = array(CURLOPT_URL => $url,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $post_string,
CURLOPT_USERAGENT => "PubSubHubbub-Publisher-PHP/1.0");
$ch = curl_init();
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$this->last_response = $response;
$info = curl_getinfo($ch);
curl_close($ch);
// all good
if ($info['http_code'] == 204)
return true;
return false;
}
}
?>
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