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<?php
/**
* A PHP client library for pubsubhubbub.
*
* @link http://code.google.com/p/pubsubhubbub/
*
* @author Josh Fraser | joshfraser.com | [email protected]
* @license Apache License 2.0
*/
namespace Pubsubhubbub\Subscriber;
use InvalidArgumentException;
class Subscriber
{
/**
* Put your google key here.
* Required if you want to use the google feed API to lookup RSS feeds.
*
* @var string
*/
protected $google_key = '';
/**
* @var string
*/
protected $hub_url;
/**
* @var string
*/
protected $callback_url;
/**
* @var string
*/
protected $credentials;
/**
* @var string accepted values are "async" and "sync"
*/
protected $verify = 'async';
/**
* @var string
*/
protected $verify_token;
/**
* @var string
*/
protected $lease_seconds;
/**
* Create a new Subscriber (credentials added for SuperFeedr support).
*
* @param string $hub_url
* @param string $callback_url
* @param string $credentials
*/
public function __construct($hub_url, $callback_url, $credentials = false)
{
if (! isset($hub_url)) {
throw new InvalidArgumentException('Please specify a hub url');
}
if (! preg_match('|^https?://|i', $hub_url)) {
throw new InvalidArgumentException('The specified hub url does not appear to be valid: ' . $hub_url);
}
if (! isset($callback_url)) {
throw new InvalidArgumentException('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.
*
* @param string $url
* @param callable $http_function
*
* @return string
*/
public function find_feed($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;
}
/**
* Subscribe to a topic.
*
* @param string $topic_url
* @param callable $http_function
*
* @return mixed
*/
public function subscribe($topic_url, $http_function = false)
{
return $this->change_subscription('subscribe', $topic_url, $http_function);
}
/**
* Unsubscribe from a topic.
*
* @param string $topic_url
* @param callable $http_function
*
* @return mixed
*/
public function unsubscribe($topic_url, $http_function = false)
{
return $this->change_subscription('unsubscribe', $topic_url, $http_function);
}
/**
* Helper function since sub/unsub are handled the same way.
*
* @param string $mode
* @param string $topic_url
* @param callable $http_function
*
* @return mixed
*/
private function change_subscription($mode, $topic_url, $http_function = false)
{
if (! isset($topic_url)) {
throw new InvalidArgumentException('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 InvalidArgumentException('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 ($http_function) {
return call_user_func_array($http_function, [$this->hub_url, $post_string]);
}
return $this->http($this->hub_url, $post_string);
}
/**
* Default http function that uses curl to post to the hub endpoint.
*
* @param string $url
* @param string $post_string
*
* @return mixed
*/
private function http($url, $post_string)
{
// add any additional curl options here
$options = [
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;
}
}
|
