120 lines
4.4 KiB
PHP
120 lines
4.4 KiB
PHP
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<?php
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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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class Subscriber {
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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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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 $lease_seconds;
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// create a new Subscriber (credentials added for SuperFeedr support)
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public function __construct($hub_url, $callback_url, $credentials = false) {
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if (!isset($hub_url))
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throw new Exception('Please specify a hub url');
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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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if (!isset($callback_url))
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throw new Exception('Please specify a callback');
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$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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// $use_regexp lets you choose whether to use google AJAX feed api (faster, but cached) or a regexp to read from site
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public function find_feed($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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$result = json_decode($response, true);
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$rss_url = $result['responseData']['url'];
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return $rss_url;
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}
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public function subscribe($topic_url, $http_function = false) {
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return $this->change_subscription("subscribe", $topic_url, $http_function = false);
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}
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public function unsubscribe($topic_url, $http_function = false) {
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return $this->change_subscription("unsubscribe", $topic_url, $http_function = false);
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}
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// helper function since sub/unsub are handled the same way
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private function change_subscription($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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// 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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// 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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// append the topic url parameters
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$post_string .= "&hub.topic=".urlencode($topic_url);
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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,$post_string);
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}
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// default http function that uses curl to post to the hub endpoint
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private function http($url, $post_string) {
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// add any additional curl options here
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$options = array(CURLOPT_URL => $url,
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CURLOPT_USERAGENT => "PubSubHubbub-Subscriber-PHP/1.0",
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CURLOPT_RETURNTRANSFER => true);
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if ($post_string) {
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$options[CURLOPT_POST] = true;
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$options[CURLOPT_POSTFIELDS] = $post_string;
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}
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if ($this->credentials)
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$options[CURLOPT_USERPWD] = $this->credentials;
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$ch = curl_init();
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curl_setopt_array($ch, $options);
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$response = curl_exec($ch);
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$info = curl_getinfo($ch);
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// all good -- anything in the 200 range
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if (substr($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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