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- <?php
- /**
- * PubSubHubbub plugin.
- *
- * PubSub is a protocol which fasten up RSS fetching:
- * - Every time a new link is posted, Shaarli notify the hub.
- * - The hub notify all feed subscribers that a new link has been posted.
- * - Subscribers retrieve the new link.
- */
- use pubsubhubbub\publisher\Publisher;
- /**
- * Plugin init function - set the hub to the default appspot one.
- *
- * @param ConfigManager $conf instance.
- */
- function pubsubhubbub_init($conf)
- {
- $hub = $conf->get('plugins.PUBSUBHUB_URL');
- if (empty($hub)) {
- // Default hub.
- $conf->set('plugins.PUBSUBHUB_URL', 'https://pubsubhubbub.appspot.com/');
- }
- }
- /**
- * Render feed hook.
- * Adds the hub URL in ATOM and RSS feed.
- *
- * @param array $data Template data.
- * @param ConfigManager $conf instance.
- *
- * @return array updated template data.
- */
- function hook_pubsubhubbub_render_feed($data, $conf)
- {
- $feedType = $data['_PAGE_'] == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
- $template = file_get_contents(PluginManager::$PLUGINS_PATH . '/pubsubhubbub/hub.'. $feedType .'.xml');
- $data['feed_plugins_header'][] = sprintf($template, $conf->get('plugins.PUBSUBHUB_URL'));
- return $data;
- }
- /**
- * Save link hook.
- * Publish to the hub when a link is saved.
- *
- * @param array $data Template data.
- * @param ConfigManager $conf instance.
- *
- * @return array unaltered data.
- */
- function hook_pubsubhubbub_save_link($data, $conf)
- {
- $feeds = array(
- index_url($_SERVER) .'?do=atom',
- index_url($_SERVER) .'?do=rss',
- );
- $httpPost = function_exists('curl_version') ? false : 'nocurl_http_post';
- try {
- $p = new Publisher($conf->get('plugins.PUBSUBHUB_URL'));
- $p->publish_update($feeds, $httpPost);
- } catch (Exception $e) {
- error_log('Could not publish to PubSubHubbub: ' . $e->getMessage());
- }
- return $data;
- }
- /**
- * Http function used to post to the hub endpoint without cURL extension.
- *
- * @param string $url Hub endpoint.
- * @param string $postString String to POST.
- *
- * @return bool
- *
- * @throws Exception An error occurred.
- */
- function nocurl_http_post($url, $postString) {
- $params = array('http' => array(
- 'method' => 'POST',
- 'content' => $postString,
- 'user_agent' => 'PubSubHubbub-Publisher-PHP/1.0',
- ));
- $context = stream_context_create($params);
- $fp = @fopen($url, 'rb', false, $context);
- if (!$fp) {
- throw new Exception('Could not post to '. $url);
- }
- $response = @stream_get_contents($fp);
- if ($response === false) {
- throw new Exception('Bad response from the hub '. $url);
- }
- return $response;
- }
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