Move PubSubHubbub code as a default plugin

[github/shaarli/Shaarli.git] / plugins / pubsubhubbub / pubsubhubbub.php

diff --git a/plugins/pubsubhubbub/pubsubhubbub.php b/plugins/pubsubhubbub/pubsubhubbub.php
new file mode 100644 (file)
index 0000000..03b6757
--- /dev/null
+++ b/plugins/pubsubhubbub/pubsubhubbub.php
@@ -0,0 +1,101 @@
+<?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;
+}