115 lines
3 KiB
PHP
115 lines
3 KiB
PHP
<?php
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/**
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* PubSubHubbub plugin.
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*
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* PubSub is a protocol which fasten up RSS fetching:
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* - Every time a new link is posted, Shaarli notify the hub.
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* - The hub notify all feed subscribers that a new link has been posted.
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* - Subscribers retrieve the new link.
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*/
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use pubsubhubbub\publisher\Publisher;
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use Shaarli\Config\ConfigManager;
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use Shaarli\Feed\FeedBuilder;
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use Shaarli\Plugin\PluginManager;
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use Shaarli\Router;
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/**
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* Plugin init function - set the hub to the default appspot one.
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*
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* @param ConfigManager $conf instance.
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*/
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function pubsubhubbub_init($conf)
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{
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$hub = $conf->get('plugins.PUBSUBHUB_URL');
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if (empty($hub)) {
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// Default hub.
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$conf->set('plugins.PUBSUBHUB_URL', 'https://pubsubhubbub.appspot.com/');
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}
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}
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/**
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* Render feed hook.
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* Adds the hub URL in ATOM and RSS feed.
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*
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* @param array $data Template data.
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* @param ConfigManager $conf instance.
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*
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* @return array updated template data.
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*/
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function hook_pubsubhubbub_render_feed($data, $conf)
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{
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$feedType = $data['_PAGE_'] == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
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$template = file_get_contents(PluginManager::$PLUGINS_PATH . '/pubsubhubbub/hub.'. $feedType .'.xml');
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$data['feed_plugins_header'][] = sprintf($template, $conf->get('plugins.PUBSUBHUB_URL'));
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return $data;
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}
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/**
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* Save link hook.
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* Publish to the hub when a link is saved.
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*
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* @param array $data Template data.
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* @param ConfigManager $conf instance.
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*
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* @return array unaltered data.
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*/
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function hook_pubsubhubbub_save_link($data, $conf)
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{
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$feeds = array(
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index_url($_SERVER) .'?do=atom',
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index_url($_SERVER) .'?do=rss',
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);
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$httpPost = function_exists('curl_version') ? false : 'nocurl_http_post';
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try {
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$p = new Publisher($conf->get('plugins.PUBSUBHUB_URL'));
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$p->publish_update($feeds, $httpPost);
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} catch (Exception $e) {
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error_log(sprintf(t('Could not publish to PubSubHubbub: %s'), $e->getMessage()));
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}
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return $data;
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}
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/**
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* Http function used to post to the hub endpoint without cURL extension.
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*
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* @param string $url Hub endpoint.
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* @param string $postString String to POST.
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*
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* @return bool
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*
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* @throws Exception An error occurred.
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*/
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function nocurl_http_post($url, $postString)
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{
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$params = array('http' => array(
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'method' => 'POST',
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'content' => $postString,
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'user_agent' => 'PubSubHubbub-Publisher-PHP/1.0',
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));
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$context = stream_context_create($params);
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$fp = @fopen($url, 'rb', false, $context);
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if (!$fp) {
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throw new Exception(sprintf(t('Could not post to %s'), $url));
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}
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$response = @stream_get_contents($fp);
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if ($response === false) {
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throw new Exception(sprintf(t('Bad response from the hub %s'), $url));
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}
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return $response;
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}
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/**
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* This function is never called, but contains translation calls for GNU gettext extraction.
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*/
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function pubsubhubbub_dummy_translation()
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{
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// meta
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t('Enable PubSubHubbub feed publishing.');
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}
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