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<?php
/**
* a PHP client library for pubsubhubbub.
*
* @link https://github.com/pubsubhubbub/
*
* @author Josh Fraser | joshfraser.com | [email protected]
* @license Apache License 2.0
*/
namespace pubsubhubbub\publisher;
use InvalidArgumentException;
class Publisher
{
/**
* @var string
*/
protected $hub_url;
/**
* @var string
*/
protected $last_response;
/**
* Create a new Publisher.
*
* @param string $hub_url
*/
public function __construct($hub_url)
{
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);
}
$this->hub_url = $hub_url;
}
/**
* Accepts either a single url or an array of urls.
*
* @param string|array $topic_urls
* @param callable $http_function
*
* @return mixed
*/
public function publish_update($topic_urls, $http_function = false)
{
if (! isset($topic_urls)) {
throw new InvalidArgumentException('Please specify a topic url');
}
// check that we're working with an array
if (! is_array($topic_urls)) {
$topic_urls = [$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 InvalidArgumentException('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);
}
return $this->http_post($this->hub_url, $post_string);
}
/**
* Returns any error message from the latest request.
*
* @return string
*/
public function last_response()
{
return $this->last_response;
}
/**
* Default http function that uses curl to post to the hub endpoint.
*
* @param string $url
* @param string $post_string
*
* @return bool
*/
private function http_post($url, $post_string)
{
// add any additional curl options here
$options = [
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);
return $info['http_code'] == 204;
}
}
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