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<?php
/**
* Elgg Twitter Service
* This service plugin allows users to authenticate their Elgg account with Twitter.
*
* @package TwitterAPI
*/
elgg_register_event_handler('init', 'system', 'twitter_api_init');
function twitter_api_init() {
// require libraries
$base = elgg_get_plugins_path() . 'twitter_api';
elgg_register_class('TwitterOAuth', "$base/vendors/twitteroauth/twitterOAuth.php");
elgg_register_library('twitter_api', "$base/lib/twitter_api.php");
elgg_load_library('twitter_api');
// extend site views
//elgg_extend_view('metatags', 'twitter_api/metatags');
elgg_extend_view('css/elgg', 'twitter_api/css');
elgg_extend_view('css/admin', 'twitter_api/css');
// sign on with twitter
if (twitter_api_allow_sign_on_with_twitter()) {
elgg_extend_view('login/extend', 'twitter_api/login');
}
// register page handler
elgg_register_page_handler('twitter_api', 'twitter_api_pagehandler');
// backward compatibility
elgg_register_page_handler('twitterservice', 'twitter_api_pagehandler_deprecated');
// register Walled Garden public pages
elgg_register_plugin_hook_handler('public_pages', 'walled_garden', 'twitter_api_public_pages');
// push status messages to twitter
elgg_register_plugin_hook_handler('status', 'user', 'twitter_api_tweet');
$actions = dirname(__FILE__) . '/actions/twitter_api';
elgg_register_action('twitter_api/interstitial_settings', "$actions/interstitial_settings.php", 'logged_in');
}
/**
* Handles old pg/twitterservice/ handler
*
* @param array $page
* @return bool
*/
function twitter_api_pagehandler_deprecated($page) {
$url = elgg_get_site_url() . 'pg/twitter_api/authorize';
$msg = elgg_echo('twitter_api:deprecated_callback_url', array($url));
register_error($msg);
return twitter_api_pagehandler($page);
}
/**
* Serves pages for twitter.
*
* @param array $page
* @return void
*/
function twitter_api_pagehandler($page) {
if (!isset($page[0])) {
return false;
}
switch ($page[0]) {
case 'authorize':
twitter_api_authorize();
break;
case 'revoke':
twitter_api_revoke();
break;
case 'forward':
twitter_api_forward();
break;
case 'login':
twitter_api_login();
break;
case 'interstitial':
gatekeeper();
// only let twitter users do this.
$guid = elgg_get_logged_in_user_guid();
$twitter_name = elgg_get_plugin_user_setting('twitter_name', $guid, 'twitter_api');
if (!$twitter_name) {
register_error(elgg_echo('twitter_api:invalid_page'));
forward();
}
$pages = dirname(__FILE__) . '/pages/twitter_api';
include "$pages/interstitial.php";
break;
default:
return false;
}
return true;
}
/**
* Push a status update to twitter.
*
* @param string $hook
* @param string $type
* @param null $returnvalue
* @param array $params
*/
function twitter_api_tweet($hook, $type, $returnvalue, $params) {
if (!elgg_instanceof($params['user'])) {
return;
}
// @todo - allow admin to select origins?
// check admin settings
$consumer_key = elgg_get_plugin_setting('consumer_key', 'twitter_api');
$consumer_secret = elgg_get_plugin_setting('consumer_secret', 'twitter_api');
if (!($consumer_key && $consumer_secret)) {
return;
}
// check user settings
$user_id = $params['user']->getGUID();
$access_key = elgg_get_plugin_user_setting('access_key', $user_id, 'twitter_api');
$access_secret = elgg_get_plugin_user_setting('access_secret', $user_id, 'twitter_api');
if (!($access_key && $access_secret)) {
return;
}
// send tweet
$api = new TwitterOAuth($consumer_key, $consumer_secret, $access_key, $access_secret);
$response = $api->post('statuses/update', array('status' => $params['message']));
}
/**
* Get tweets for a user.
*
* @param int $user_id The Elgg user GUID
* @param array $options
*/
function twitter_api_fetch_tweets($user_guid, $options = array()) {
// check admin settings
$consumer_key = elgg_get_plugin_setting('consumer_key', 'twitter_api');
$consumer_secret = elgg_get_plugin_setting('consumer_secret', 'twitter_api');
if (!($consumer_key && $consumer_secret)) {
return FALSE;
}
// check user settings
$access_key = elgg_get_plugin_user_setting('access_key', $user_guid, 'twitter_api');
$access_secret = elgg_get_plugin_user_setting('access_secret', $user_guid, 'twitter_api');
if (!($access_key && $access_secret)) {
return FALSE;
}
// fetch tweets
$api = new TwitterOAuth($consumer_key, $consumer_secret, $access_key, $access_secret);
return $api->get('statuses/user_timeline', $options);
}
/**
* Register as public pages for walled garden.
*
* @param string $hook
* @param string $type
* @param array $return_value
* @param array $params
*/
function twitter_api_public_pages($hook, $type, $return_value, $params) {
$return_value[] = 'twitter_api/forward';
$return_value[] = 'twitter_api/login';
return $return_value;
}
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