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+<?php
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+
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+// a PHP client library for pubsubhubbub
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+// as defined at http://code.google.com/p/pubsubhubbub/
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+// written by Josh Fraser | joshfraser.com | josh@eventvue.com
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+// Released under Apache License 2.0
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+
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+class Subscriber {
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+
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+ // put your google key here
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+ // required if you want to use the google feed API to lookup RSS feeds
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+ protected $google_key = "";
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+
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+ protected $hub_url;
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+ protected $callback_url;
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+ protected $credentials;
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+ // accepted values are "async" and "sync"
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+ protected $verify = "async";
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+ protected $verify_token;
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+ protected $lease_seconds;
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+
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+ // create a new Subscriber (credentials added for SuperFeedr support)
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+ public function __construct($hub_url, $callback_url, $credentials = false) {
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+
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+ if (!isset($hub_url))
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+ throw new Exception('Please specify a hub url');
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+
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+ if (!preg_match("|^https?://|i",$hub_url))
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+ throw new Exception('The specified hub url does not appear to be valid: '.$hub_url);
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+
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+ if (!isset($callback_url))
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+ throw new Exception('Please specify a callback');
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+
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+ $this->hub_url = $hub_url;
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+ $this->callback_url = $callback_url;
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+ $this->credentials = $credentials;
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+ }
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+
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+ // $use_regexp lets you choose whether to use google AJAX feed api (faster, but cached) or a regexp to read from site
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+ public function find_feed($url, $http_function = false) {
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+ // using google feed API
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+ $url = "http://ajax.googleapis.com/ajax/services/feed/lookup?key={$this->google_key}&v=1.0&q=".urlencode($url);
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+ // fetch the content
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+ if ($http_function)
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+ $response = $http_function($url);
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+ else
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+ $response = $this->http($url);
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+
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+ $result = json_decode($response, true);
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+ $rss_url = $result['responseData']['url'];
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+ return $rss_url;
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+ }
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+
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+ public function subscribe($topic_url, $http_function = false) {
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+ return $this->change_subscription("subscribe", $topic_url, $http_function = false);
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+ }
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+
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+ public function unsubscribe($topic_url, $http_function = false) {
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+ return $this->change_subscription("unsubscribe", $topic_url, $http_function = false);
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+ }
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+
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+ // helper function since sub/unsub are handled the same way
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+ private function change_subscription($mode, $topic_url, $http_function = false) {
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+ if (!isset($topic_url))
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+ throw new Exception('Please specify a topic url');
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+
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+ // lightweight check that we're actually working w/ a valid url
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+ if (!preg_match("|^https?://|i",$topic_url))
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+ throw new Exception('The specified topic url does not appear to be valid: '.$topic_url);
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+
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+ // set the mode subscribe/unsubscribe
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+ $post_string = "hub.mode=".$mode;
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+ $post_string .= "&hub.callback=".urlencode($this->callback_url);
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+ $post_string .= "&hub.verify=".$this->verify;
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+ $post_string .= "&hub.verify_token=".$this->verify_token;
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+ $post_string .= "&hub.lease_seconds=".$this->lease_seconds;
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+
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+ // append the topic url parameters
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+ $post_string .= "&hub.topic=".urlencode($topic_url);
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+
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+ // make the http post request and return true/false
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+ // easy to over-write to use your own http function
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+ if ($http_function)
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+ return $http_function($this->hub_url,$post_string);
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+ else
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+ return $this->http($this->hub_url,$post_string);
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+ }
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+
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+ // default http function that uses curl to post to the hub endpoint
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+ private function http($url, $post_string) {
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+
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+ // add any additional curl options here
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+ $options = array(CURLOPT_URL => $url,
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+ CURLOPT_USERAGENT => "PubSubHubbub-Subscriber-PHP/1.0",
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+ CURLOPT_RETURNTRANSFER => true);
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+
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+ if ($post_string) {
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+ $options[CURLOPT_POST] = true;
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+ $options[CURLOPT_POSTFIELDS] = $post_string;
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+ }
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+
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+ if ($this->credentials)
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+ $options[CURLOPT_USERPWD] = $this->credentials;
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+
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+ $ch = curl_init();
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+ curl_setopt_array($ch, $options);
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+
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+ $response = curl_exec($ch);
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+ $info = curl_getinfo($ch);
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+
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+ // all good -- anything in the 200 range
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+ if (substr($info['http_code'],0,1) == "2") {
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+ return $response;
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+ }
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+ return false;
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+ }
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+}
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+
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+
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+?>
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