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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 | [email protected]
// Released under Apache License 2.0
class Subscriber {
// put your google key here
// required if you want to use the google feed API to lookup RSS feeds
protected $google_key = "";
protected $hub_url;
protected $callback_url;
protected $credentials;
// accepted values are "async" and "sync"
protected $verify = "async";
protected $verify_token;
protected $lease_seconds;
// create a new Subscriber (credentials added for SuperFeedr support)
public function __construct($hub_url, $callback_url, $credentials = false) {
if (!isset($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);
if (!isset($callback_url))
throw new Exception('Please specify a callback');
$this->hub_url = $hub_url;
$this->callback_url = $callback_url;
$this->credentials = $credentials;
}
// $use_regexp lets you choose whether to use google AJAX feed api (faster, but cached) or a regexp to read from site
public function find_feed($url, $http_function = false) {
// using google feed API
$url = "http://ajax.googleapis.com/ajax/services/feed/lookup?key={$this->google_key}&v=1.0&q=".urlencode($url);
// fetch the content
if ($http_function)
$response = $http_function($url);
else
$response = $this->http($url);
$result = json_decode($response, true);
$rss_url = $result['responseData']['url'];
return $rss_url;
}
public function subscribe($topic_url, $http_function = false) {
return $this->change_subscription("subscribe", $topic_url, $http_function = false);
}
public function unsubscribe($topic_url, $http_function = false) {
return $this->change_subscription("unsubscribe", $topic_url, $http_function = false);
}
// helper function since sub/unsub are handled the same way
private function change_subscription($mode, $topic_url, $http_function = false) {
if (!isset($topic_url))
throw new Exception('Please specify a 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);
// set the mode subscribe/unsubscribe
$post_string = "hub.mode=".$mode;
$post_string .= "&hub.callback=".urlencode($this->callback_url);
$post_string .= "&hub.verify=".$this->verify;
$post_string .= "&hub.verify_token=".$this->verify_token;
$post_string .= "&hub.lease_seconds=".$this->lease_seconds;
// append the topic url parameters
$post_string .= "&hub.topic=".urlencode($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 $this->http($this->hub_url,$post_string);
}
// default http function that uses curl to post to the hub endpoint
private function http($url, $post_string) {
// add any additional curl options here
$options = array(CURLOPT_URL => $url,
CURLOPT_USERAGENT => "PubSubHubbub-Subscriber-PHP/1.0",
CURLOPT_RETURNTRANSFER => true);
if ($post_string) {
$options[CURLOPT_POST] = true;
$options[CURLOPT_POSTFIELDS] = $post_string;
}
if ($this->credentials)
$options[CURLOPT_USERPWD] = $this->credentials;
$ch = curl_init();
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$info = curl_getinfo($ch);
// all good -- anything in the 200 range
if (substr($info['http_code'],0,1) == "2") {
return $response;
}
return false;
}
}
?>
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