WebSub/PubSubHubbub - Version 1.6.2

Version Description

Release Info

Developer	joshfraz
Plugin	WebSub/PubSubHubbub
Version	1.6.2
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Version 1.6.2

Files changed (5) hide show

pubsubhubbub-php/publisher.php +90 -0
pubsubhubbub-php/subscriber.php +153 -0
pubsubhubbub.php +319 -0
readme.txt +81 -0
screenshot-1.png +0 -0

pubsubhubbub-php/publisher.php ADDED Viewed

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1	+ <?php
2	+ // a PHP client library for pubsubhubbub
3	+ // as defined at http://code.google.com/p/pubsubhubbub/
4	+ // written by Josh Fraser \| joshfraser.com \| joshfraz@gmail.com
5	+ // modified by Matthias Pfefferle \| notizblog.org \| matthias@pfefferle.org
6	+ // Released under Apache License 2.0
7	+
8	+ /**
9	+ * a pubsubhubbub publisher
10	+ *
11	+ * @author Josh Fraser
12	+ * @author Matthias Pfefferle
13	+ */
14	+ class PshbPublisher {
15	+ protected $hub_url;
16	+ protected $last_response;
17	+
18	+ // create a new Publisher
19	+ public function __construct($hub_url) {
20	+
21	+ if (!isset($hub_url))
22	+ throw new Exception('Please specify a hub url');
23	+
24	+ if (!preg_match("\|^https?://\|i",$hub_url))
25	+ throw new Exception('The specified hub url does not appear to be valid: '.$hub_url);
26	+
27	+ $this->hub_url = $hub_url;
28	+ }
29	+
30	+ // accepts either a single url or an array of urls
31	+ public function publish_update($topic_urls, $http_function = false) {
32	+ if (!isset($topic_urls))
33	+ throw new Exception('Please specify a topic url');
34	+
35	+ // check that we're working with an array
36	+ if (!is_array($topic_urls)) {
37	+ $topic_urls = array($topic_urls);
38	+ }
39	+
40	+ // set the mode to publish
41	+ $post_string = "hub.mode=publish";
42	+ // loop through each topic url
43	+ foreach ($topic_urls as $topic_url) {
44	+ // lightweight check that we're actually working w/ a valid url
45	+ if (!preg_match("\|^https?://\|i",$topic_url))
46	+ throw new Exception('The specified topic url does not appear to be valid: '.$topic_url);
47	+
48	+ // append the topic url parameters
49	+ $post_string .= "&hub.url=".urlencode($topic_url);
50	+ }
51	+
52	+ // make the http post request and return true/false
53	+ // easy to over-write to use your own http function
54	+ if ($http_function)
55	+ return $http_function($this->hub_url,$post_string);
56	+ else
57	+ return $this->http_post($this->hub_url,$post_string);
58	+ }
59	+
60	+ // returns any error message from the latest request
61	+ public function last_response() {
62	+ return $this->last_response;
63	+ }
64	+
65	+ // default http function that uses curl to post to the hub endpoint
66	+ private function http_post($url, $post_string) {
67	+ // add any additional curl options here
68	+ $options = array(CURLOPT_URL => $url,
69	+ CURLOPT_POST => true,
70	+ CURLOPT_POSTFIELDS => $post_string,
71	+ CURLOPT_RETURNTRANSFER => true,
72	+ CURLOPT_USERAGENT => "PubSubHubbub-Publisher-PHP/1.0");
73	+
74	+ $ch = curl_init();
75	+ curl_setopt_array($ch, $options);
76	+
77	+ $response = curl_exec($ch);
78	+ $this->last_response = $response;
79	+ $info = curl_getinfo($ch);
80	+
81	+ curl_close($ch);
82	+
83	+ // all good
84	+ if ($info['http_code'] == 204)
85	+ return true;
86	+
87	+ return false;
88	+ }
89	+ }
90	+ ?>

pubsubhubbub-php/subscriber.php ADDED Viewed

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1	+ <?php
2	+ // a PHP client library for pubsubhubbub
3	+ // as defined at http://code.google.com/p/pubsubhubbub/
4	+ // written by Josh Fraser \| joshfraser.com \| joshfraz@gmail.com
5	+ // modified by Matthias Pfefferle \| notizblog.org \| matthias@pfefferle.org
6	+ // Released under Apache License 2.0
7	+
8	+ /**
9	+ * a pubsubhubbub subscriber
10	+ *
11	+ * @author Josh Fraser
12	+ * @author Matthias Pfefferle
13	+ */
14	+ class PshbSubscriber {
15	+ protected $hub_url;
16	+ protected $topic_url;
17	+ protected $callback_url;
18	+ protected $credentials;
19	+ // accepted values are "async" and "sync"
20	+ protected $verify = "async";
21	+ protected $verify_token;
22	+ protected $lease_seconds;
23	+
24	+ // create a new Subscriber (credentials added for SuperFeedr support)
25	+ public function __construct($callback_url, $hub_url = null, $credentials = false) {
26	+ if ($hub_url && !preg_match("\|^https?://\|i",$hub_url))
27	+ throw new Exception('The specified hub url does not appear to be valid: '.$hub_url);
28	+
29	+ if (!isset($callback_url))
30	+ throw new Exception('Please specify a callback');
31	+
32	+ $this->hub_url = $hub_url;
33	+ $this->callback_url = $callback_url;
34	+ $this->credentials = $credentials;
35	+ }
36	+
37	+ public function subscribe($topic_url, $http_function = false) {
38	+ if (!$this->hub_url) {
39	+ $this->find_hub($topic_url);
40	+ }
41	+
42	+ return $this->change_subscription("subscribe", $topic_url, $http_function = false);
43	+ }
44	+
45	+ public function unsubscribe($topic_url, $http_function = false) {
46	+ return $this->change_subscription("unsubscribe", $topic_url, $http_function = false);
47	+ }
48	+
49	+ // helper function since sub/unsub are handled the same way
50	+ private function change_subscription($mode, $topic_url, $http_function = false) {
51	+ if (!isset($topic_url))
52	+ throw new Exception('Please specify a topic url');
53	+
54	+ // lightweight check that we're actually working w/ a valid url
55	+ if (!preg_match("\|^https?://\|i",$topic_url))
56	+ throw new Exception('The specified topic url does not appear to be valid: '.$topic_url);
57	+
58	+ // set the mode subscribe/unsubscribe
59	+ $post_string = "hub.mode=".$mode;
60	+ $post_string .= "&hub.callback=".urlencode($this->callback_url);
61	+ $post_string .= "&hub.verify=".$this->verify;
62	+ $post_string .= "&hub.verify_token=".$this->verify_token;
63	+ $post_string .= "&hub.lease_seconds=".$this->lease_seconds;
64	+
65	+ // append the topic url parameters
66	+ $post_string .= "&hub.topic=".urlencode($topic_url);
67	+
68	+ // make the http post request and return true/false
69	+ // easy to over-write to use your own http function
70	+ if ($http_function)
71	+ return $http_function($this->hub_url,$post_string);
72	+ else
73	+ return $this->http($this->hub_url,$post_string);
74	+ }
75	+
76	+ // default http function that uses curl to post to the hub endpoint
77	+ private function http($url, $post_string = null) {
78	+
79	+ // add any additional curl options here
80	+ $options = array(CURLOPT_URL => $url,
81	+ CURLOPT_USERAGENT => "PubSubHubbub-Subscriber-PHP/1.0",
82	+ CURLOPT_RETURNTRANSFER => true,
83	+ CURLOPT_FOLLOWLOCATION => true);
84	+
85	+ if ($post_string) {
86	+ $options[CURLOPT_POST] = true;
87	+ $options[CURLOPT_POSTFIELDS] = $post_string;
88	+ }
89	+
90	+ if ($this->credentials)
91	+ $options[CURLOPT_USERPWD] = $this->credentials;
92	+
93	+ $ch = curl_init();
94	+ curl_setopt_array($ch, $options);
95	+
96	+ $response = curl_exec($ch);
97	+ $info = curl_getinfo($ch);
98	+
99	+ // all good -- anything in the 200 range
100	+ if (substr($info['http_code'],0,1) == "2") {
101	+ return $response;
102	+ }
103	+
104	+ return false;
105	+ }
106	+
107	+ // discover the hub url
108	+ public function find_hub($topic_url) {
109	+ $self = $topic_url;
110	+ $xml = $this->http($topic_url);
111	+ if (!$xml)
112	+ throw new Exception('Please enter a valid URL');
113	+
114	+ $xml_parser = xml_parser_create('');
115	+ $xml_values = array();
116	+ $xml_tags = array();
117	+
118	+ if(!$xml_parser)
119	+ throw new Exception('Your webserver doesn\'t support xml-parsing');
120	+
121	+ xml_parser_set_option($xml_parser, XML_OPTION_TARGET_ENCODING, 'UTF-8');
122	+ xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, 0);
123	+ xml_parser_set_option($xml_parser, XML_OPTION_SKIP_WHITE, 1);
124	+ xml_parse_into_struct($xml_parser, trim($xml), $xml_values);
125	+ xml_parser_free($xml_parser);
126	+
127	+ $hubs = array();
128	+
129	+ foreach ($xml_values as $value) {
130	+ // get hubs
131	+ if ($value['attributes']['rel'] == 'hub') {
132	+ $hubs[] = $value['attributes']['href'];
133	+ }
134	+ // get self url
135	+ if ($value['attributes']['rel'] == 'self') {
136	+ $self = $value['attributes']['href'];
137	+ }
138	+ }
139	+
140	+ if (count($hubs) >= 1)
141	+ $this->hub_url = $hubs[0];
142	+ else
143	+ throw new Exception('This feed doesn\'t reference a hub url');
144	+
145	+ $this->topic_url = $self;
146	+ }
147	+
148	+ // getter
149	+ public function get_topic_url() {
150	+ return $this->topic_url;
151	+ }
152	+ }
153	+ ?>

pubsubhubbub.php ADDED Viewed

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1	+ <?php
2	+ /*
3	+ Plugin Name: PubSubHubbub
4	+ Plugin URI: http://code.google.com/p/pubsubhubbub/
5	+ Description: A better way to tell the world when your blog is updated.
6	+ Version: 1.6.2
7	+ Author: Josh Fraser, Matthias Pfefferle
8	+ Author Email: joshfraz@gmail.com
9	+ Author URI: http://wordpress.org/extend/plugins/pubsubhubbub/
10	+ */
11	+
12	+ include("pubsubhubbub-php/publisher.php");
13	+ include("pubsubhubbub-php/subscriber.php");
14	+
15	+ // the ability for other plugins to hook into the PuSH code based on a
16	+ // fix by Stephen Paul Weber (http://singpolyma.net)
17	+ function pshb_publish_to_hub($feed_urls) {
18	+ // remove dups (ie. they all point to feedburner)
19	+ $feed_urls = array_unique($feed_urls);
20	+ // get the list of hubs
21	+ $hub_urls = pshb_get_pubsub_endpoints();
22	+ // loop through each hub
23	+ foreach ($hub_urls as $hub_url) {
24	+ $p = new PshbPublisher($hub_url);
25	+ // publish the update to each hub
26	+ if (!$p->publish_update($feed_urls)) {
27	+ // TODO: add better error handling here
28	+ }
29	+ }
30	+ }
31	+
32	+ // subscribe to a feed
33	+ // NOTE! THIS IS BETA STATE
34	+ function pshb_subscribe($url) {
35	+ try {
36	+ $s = new PshbSubscriber(site_url("/?pubsubhubbub=endpoint"));
37	+ $s->find_hub($url);
38	+
39	+ $subscriptions = get_option('pubsub_subscribe');
40	+ $subscriptions[] = $s->get_topic_url();
41	+ update_option('pubsub_subscribe', array_unique($subscriptions));
42	+
43	+ if ($s->subscribe($s->get_topic_url()) !== false) {
44	+ return true;
45	+ }
46	+ } catch (Exception $e) {
47	+ return $e->getMessage();
48	+ }
49	+
50	+ return false;
51	+ }
52	+
53	+ // unsubscribe from a feed
54	+ // NOTE! THIS IS BETA STATE
55	+ function pshb_unsubscribe($url) {
56	+ try {
57	+ $s = new PshbSubscriber(site_url("/?pubsubhubbub=endpoint"));
58	+ $s->find_hub($url);
59	+
60	+ $to_unsubscribe = get_option('pubsub_unsubscribe');
61	+ $to_unsubscribe[] = $s->get_topic_url();
62	+ update_option('pubsub_unsubscribe', array_unique($to_unsubscribe));
63	+
64	+ if ($s->unsubscribe($s->get_topic_url()) !== false) {
65	+ return true;
66	+ }
67	+ } catch (Exception $e) {
68	+ return $e->getMessage();
69	+ }
70	+
71	+ return false;
72	+ }
73	+
74	+ // function that is called whenever a new post is published
75	+ function pshb_publish_post($post_id) {
76	+ // we want to notify the hub for every feed
77	+ $feed_urls = array();
78	+ $feed_urls[] = get_bloginfo('atom_url');
79	+ $feed_urls[] = get_bloginfo('rss_url');
80	+ $feed_urls[] = get_bloginfo('rdf_url');
81	+ $feed_urls[] = get_bloginfo('rss2_url');
82	+ // customize default feeds
83	+ $feed_urls = apply_filters('pshb_feed_urls', $feed_urls);
84	+
85	+ pshb_publish_to_hub($feed_urls);
86	+
87	+ return $post_id;
88	+ }
89	+ add_action('publish_post', 'pshb_publish_post');
90	+
91	+ // function that is called whenever a new comment is published
92	+ function pshb_publish_comment($comment_id) {
93	+ // we want to notify the hub for every feed
94	+ $feed_urls = array();
95	+ $feed_urls[] = get_bloginfo('comments_atom_url');
96	+ $feed_urls[] = get_bloginfo('comments_rss2_url');
97	+ // customize default feeds
98	+ $feed_urls = apply_filters('pshb_comment_feed_urls', $feed_urls);
99	+
100	+ pshb_publish_to_hub($feed_urls);
101	+
102	+ return $comment_id;
103	+ }
104	+ add_action('comment_post', 'pshb_publish_comment');
105	+
106	+ // to our atom feed
107	+ function pshb_add_atom_link_tag() {
108	+ $hub_urls = pshb_get_pubsub_endpoints();
109	+ foreach ($hub_urls as $hub_url) {
110	+ echo '<link rel="hub" href="'.$hub_url.'" />';
111	+ }
112	+ }
113	+ add_action('atom_head', 'pshb_add_atom_link_tag');
114	+ add_action('comments_atom_head', 'pshb_add_atom_link_tag');
115	+ //add_action('wp_head', 'pshb_add_atom_link_tag');
116	+
117	+ function pshb_add_rss_link_tag() {
118	+ $hub_urls = pshb_get_pubsub_endpoints();
119	+ foreach ($hub_urls as $hub_url) {
120	+ echo '<atom:link rel="hub" href="'.$hub_url.'"/>';
121	+ }
122	+ }
123	+ add_action('rss_head', 'pshb_add_rss_link_tag');
124	+ add_action('rdf_header', 'pshb_add_rss_link_tag');
125	+ add_action('rss2_head', 'pshb_add_rss_link_tag');
126	+ add_action('commentsrss2_head', 'pshb_add_rss_link_tag');
127	+
128	+ function pshb_add_rdf_ns_link() {
129	+ echo 'xmlns:atom="http://www.w3.org/2005/Atom"';
130	+ }
131	+ add_action('rdf_ns', 'pshb_add_rdf_ns_link');
132	+
133	+
134	+ // hack to add the atom definition to the RSS feed
135	+ // start capturing the feed output. this is run at priority 9 (before output)
136	+ function pshb_start_rss_link_tag() {
137	+ ob_start();
138	+ }
139	+ add_action('do_feed_rss', 'pshb_start_rss_link_tag', 9); // run before output
140	+
141	+ // this is run at priority 11 (after output)
142	+ // add in the xmlns atom definition link
143	+ function pshb_end_rss_link_tag() {
144	+ $feed = ob_get_clean();
145	+ $pattern = '/<rss version="(.+)">/i';
146	+ $replacement = '<rss version="$1" xmlns:atom="http://www.w3.org/2005/Atom">';
147	+ // change <rss version="X.XX"> to <rss version="X.XX" xmlns:atom="http://www.w3.org/2005/Atom">
148	+ echo preg_replace($pattern, $replacement, $feed);
149	+ }
150	+ add_action('do_feed_rss', 'pshb_end_rss_link_tag', 11); // run after output
151	+
152	+ // add a link to our settings page in the WP menu
153	+ function pshb_add_plugin_menu() {
154	+ add_options_page('PubSubHubbub Settings', 'PubSubHubbub', 'administrator', __FILE__, 'pshb_add_settings_page');
155	+ }
156	+ add_action('admin_menu', 'pshb_add_plugin_menu');
157	+
158	+ // get the endpoints from the wordpress options table
159	+ // valid parameters are "publish" or "subscribe"
160	+ function pshb_get_pubsub_endpoints() {
161	+ $endpoints = get_option('pubsub_endpoints');
162	+ $hub_urls = explode("\n",$endpoints);
163	+
164	+ // if no values have been set, revert to the defaults (pubsubhubbub on app engine & superfeedr)
165	+ if (!$endpoints) {
166	+ $hub_urls[] = "http://pubsubhubbub.appspot.com";
167	+ $hub_urls[] = "http://pubsubhubbub.superfeedr.com";
168	+ }
169	+
170	+ // clean out any blank values
171	+ foreach ($hub_urls as $key => $value) {
172	+ if (is_null($value) \|\| $value=="") {
173	+ unset($hub_urls[$key]);
174	+ } else {
175	+ $hub_urls[$key] = trim($hub_urls[$key]);
176	+ }
177	+ }
178	+
179	+ return $hub_urls;
180	+ }
181	+
182	+ // write the content for our settings page that allows you to define your endpoints
183	+ function pshb_add_settings_page() { ?>
184	+ <div class="wrap">
185	+ <h2>Define custom hubs</h2>
186	+
187	+ <form method="post" action="options.php">
188	+ <?php //wp_nonce_field('update-options'); ?>
189	+ <!-- starting -->
190	+ <?php settings_fields('my_settings_group'); ?>
191	+ <?php do_settings_sections('my_settings_section'); ?>
192	+ <!-- ending -->
193	+
194	+ <?php
195	+ // load the existing pubsub endpoint list from the wordpress options table
196	+ $pubsub_endpoints = trim(implode("\n",pshb_get_pubsub_endpoints()),"\n");
197	+ ?>
198	+
199	+ <table class="form-table">
200	+
201	+ <tr valign="top">
202	+ <th scope="row">Hubs (one per line)</th>
203	+ <td><textarea name="pubsub_endpoints" style='width:600px;height:100px'><?php echo $pubsub_endpoints; ?></textarea></td>
204	+ </tr>
205	+
206	+ </table>
207	+
208	+ <input type="hidden" name="action" value="update" />
209	+ <input type="hidden" name="page_options" value="pubsub_endpoints" />
210	+
211	+ <p class="submit">
212	+ <input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
213	+ </p>
214	+
215	+ </form>
216	+
217	+ <br /><br />
218	+ <div style='background-color:#FFFEEB;border:1px solid #CCCCCC;padding:12px'>
219	+ <strong>Thanks for using PubSubHubbub!</strong><br />
220	+ Visit these links to learn more about PubSubHubbub and the author of this plugin:<br />
221	+ <ul>
222	+ <li><a href='http://www.onlineaspect.com'>Subscribe to Online Aspect</a></li>
223	+ <li><a href='http://www.twitter.com/joshfraser'>Follow Josh Fraser on twitter</a></li>
224	+ <li><a href='http://code.google.com/p/pubsubhubbub/'>Learn more about the PubSubHubbub protocol</a></li>
225	+ </ul>
226	+ </div>
227	+ </div>
228	+
229	+ <?php }
230	+
231	+ // add a settings link next to deactive / edit
232	+ function pshb_add_settings_link( $links, $file ) {
233	+ if( $file == 'pubsubhubbub/pubsubhubbub.php' && function_exists( "admin_url" ) ) {
234	+ $settings_link = '<a href="' . admin_url( 'options-general.php?page=pubsubhubbub/pubsubhubbub' ) . '">' . __('Settings') . '</a>';
235	+ array_unshift( $links, $settings_link ); // before other links
236	+ }
237	+ return $links;
238	+ }
239	+ add_filter('plugin_action_links', 'pshb_add_settings_link', 10, 2);
240	+
241	+ // adds some query vars
242	+ function pshb_query_var($vars) {
243	+ $vars[] = 'hub_mode';
244	+ $vars[] = 'hub_challenge';
245	+ $vars[] = 'hub_topic';
246	+ $vars[] = 'hub_url';
247	+ $vars[] = 'pubsubhubbub';
248	+ return $vars;
249	+ }
250	+ add_filter('query_vars', 'pshb_query_var');
251	+
252	+ // parses the request
253	+ function pshb_parse_request() {
254	+ global $wp_query, $wp;
255	+ $query_vars = $wp->query_vars;
256	+
257	+ // handle (un)subscribe requests
258	+ if (array_key_exists('hub_mode', $query_vars)
259	+ && in_array($query_vars['hub_mode'], array("subscribe", "unsubscribe"))
260	+ && isset($query_vars['hub_challenge'])) {
261	+ $list = get_option('pubsub_'.$query_vars['hub_mode']);
262	+ if (is_array($list) && in_array($query_vars['hub_topic'], $list)) {
263	+ // remove urls from option lists when unsubscribing
264	+ if ($query_vars['hub_mode'] == "unsubscribe") {
265	+ pshb_remove_from_option($query_vars['hub_topic'], "unsubscribe");
266	+ pshb_remove_from_option($query_vars['hub_topic'], "subscribe");
267	+ }
268	+ echo $query_vars['hub_challenge'];
269	+ exit;
270	+ }
271	+ // handle pushes
272	+ } elseif (array_key_exists('pubsubhubbub', $query_vars)
273	+ && $query_vars['pubsubhubbub'] == "endpoint"
274	+ && $request_body = @file_get_contents('php://input')) {
275	+ do_action('pshb_push', $request_body);
276	+ exit;
277	+ }
278	+ }
279	+ add_action('parse_request', 'pshb_parse_request');
280	+
281	+ // remove something from the option list
282	+ function pshb_remove_from_option($url, $option) {
283	+ if (!in_array($option, array("subscribe", "unsubscribe"))) {
284	+ return false;
285	+ }
286	+
287	+ $list = get_option('pubsub_'.$option);
288	+ $key = array_search($url, $list);
289	+ unset($list[$key]);
290	+ update_option('pubsub_'.$option, $list);
291	+ }
292	+
293	+ // adds link headers as defined in the curren v0.4 draft
294	+ // https://github.com/pubsubhubbub/PubSubHubbub/issues/2
295	+ function pshb_template_redirect() {
296	+ if ((is_comment_feed() && !is_singular())
297	+ \|\| (is_feed() && !is_comment_feed() && !is_archive())) {
298	+ $hub_urls = pshb_get_pubsub_endpoints();
299	+ foreach ($hub_urls as $hub_url) {
300	+ header('Link: <'.$hub_url.'>; rel=hub', false);
301	+ }
302	+ header('Link: <'.( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'].'>; rel=self', false);
303	+ }
304	+ }
305	+ add_action('template_redirect', 'pshb_template_redirect');
306	+
307	+ // keep WPMU happy
308	+ function pshb_register_my_settings() {
309	+ register_setting('my_settings_group','pubsub_endpoints');
310	+ }
311	+ add_action('admin_init', 'pshb_register_my_settings');
312	+
313	+ /**
314	+ * beeing backwards compatible
315	+ * @deprecated
316	+ */
317	+ function publish_to_hub($deprecated = null, $feed_urls) {
318	+ pshb_publish_to_hub($feed_urls);
319	+ }

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1	+ === Plugin Name ===
2	+ Contributors: joshfraz, pfefferle
3	+ Tags: pubsubhubbub
4	+ Requires at least: 2.5
5	+ Tested up to: 3.5.1
6	+ Stable tag: 1.6.1
7	+
8	+ A better way to tell the world when your blog is updated.
9	+
10	+ == Description ==
11	+
12	+ This [PubSubHubbub](http://code.google.com/p/pubsubhubbub/ "PubSubHubbub") plugin is a simple way to let people know in real-time when your blog is updated. PubSubHubbub is quickly gaining adoption and is already being used by Google Reader, Google Alerts, FriendFeed and more.
13	+
14	+ This plugin:
15	+
16	+ * Now supports multiple hubs!
17	+ * Supports all of the feed formats used by WordPress, not just ATOM and RSS2
18	+ * Announces which hubs you are using by adding `<link rel="hub" ...>` declarations to your template header and ATOM feed
19	+ * Adds `<atom:link rel="hub" ...>` to your RSS feeds along with the necessary XMLNS declaration for RSS 0.92/1.0
20	+
21	+ By default this plugin will ping the following hubs:
22	+
23	+ * [Demo hub on Google App Engine](http://pubsubhubbub.appspot.com "Demo hub on Google App Engine")
24	+ * [SuperFeedr](http://pubsubhubbub.superfeedr.com "SuperFeedr")
25	+
26	+ Please contact me if you operate a hub that you would like to be included as a default option.
27	+
28	+ == Installation ==
29	+
30	+ 1. Upload the `pubsubhubbub` directory to your `/wp-content/plugins/` directory
31	+ 2. Activate the plugin through the 'Plugins' menu in WordPress
32	+ 3. Select custom hubs under your PubSubHubbub Settings (optional)
33	+
34	+ == Frequently Asked Questions ==
35	+
36	+ = Where can I learn more about the PubSubHubbub protocol? =
37	+
38	+ You can visit [PubSubHubbb on Google Code](http://code.google.com/p/pubsubhubbub/ "PubSubHubbb on Google Code")
39	+
40	+ = Where can I learn more about the authors of this plugin? =
41	+
42	+ You can learn more about [Josh Fraser](http://www.joshfraser.com "Josh Fraser") at [Online Aspect](http://www.onlineaspect.com "Online Aspect")
43	+ and [Matthias Pfefferle](http://pfefferle.org "Matthias Pfefferle") at [Notizblog](http://notizblog.org/ "Notizblog")
44	+
45	+ == Screenshots ==
46	+
47	+ 1. The PubSubHubbub Settings page allows you to define which hubs you want to use
48	+
49	+ == Changelog ==
50	+
51	+ = 1.6.1 =
52	+ * Bug fixes
53	+
54	+ = 1.6 =
55	+ * Added comment-feed support
56	+ * Added simple subscriber functions
57	+ * Added link header
58	+
59	+ = 1.5 =
60	+ * Added filter to modify $feed_urls
61	+ * Re-Added Stephen Paul Webers changes
62	+
63	+ = 1.4 =
64	+ * Added name spacing to avoid conflicts with other plugins & added patch from pfefferle
65	+
66	+ = 1.3 =
67	+ * Added multi-user support and now tested up to 2.9.1
68	+
69	+ = 1.2 =
70	+ * Added support for multiple hubs
71	+
72	+ = 1.1 =
73	+ * Added RSS support
74	+
75	+ = 1.0 =
76	+ * First attempt
77	+
78	+ == Upgrade Notice ==
79	+
80	+ = 1.4 =
81	+ Upgrade eliminates conflicts with other Wordpress plugins

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