gnu-social/plugins/TwitterBridge/twitterstreamreader.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package StatusNet
* @author Brion Vibber <brion@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
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/**
* Base class for reading Twitter's User Streams and Site Streams
* real-time streaming APIs.
*
* Caller can hook event callbacks for various types of messages;
* the data from the stream and some context info will be passed
* on to the callbacks.
*/
abstract class TwitterStreamReader extends JsonStreamReader
{
protected $callbacks = array();
function __construct(TwitterOAuthClient $auth, $baseUrl)
{
$this->baseUrl = $baseUrl;
$this->oauth = $auth;
}
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public function connect($method, $params=array())
{
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$url = $this->oAuthUrl($this->baseUrl . '/' . $method, $params);
return parent::connect($url);
}
/**
* Sign our target URL with OAuth auth stuff.
*
* @param string $url
* @param array $params
* @return string
*/
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protected function oAuthUrl($url, $params=array())
{
// In an ideal world this would be better encapsulated. :)
$request = OAuthRequest::from_consumer_and_token($this->oauth->consumer,
$this->oauth->token, 'GET', $url, $params);
$request->sign_request($this->oauth->sha1_method,
$this->oauth->consumer, $this->oauth->token);
return $request->to_url();
}
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/**
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* Add an event callback to receive notifications when things come in
* over the wire.
*
* Callbacks should be in the form: function(object $data, array $context)
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* where $context may list additional data on some streams, such as the
* user to whom the message should be routed.
*
* Available events:
*
* Messaging:
*
* 'status': $data contains a status update in standard Twitter JSON format.
* $data->user: sending user in standard Twitter JSON format.
* $data->text... etc
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*
* 'direct_message': $data contains a direct message in standard Twitter JSON format.
* $data->sender: sending user in standard Twitter JSON format.
* $data->recipient: receiving user in standard Twitter JSON format.
* $data->text... etc
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*
*
* Out of band events:
*
* 'follow': User has either started following someone, or is being followed.
* $data->source: following user in standard Twitter JSON format.
* $data->target: followed user in standard Twitter JSON format.
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*
* 'favorite': Someone has favorited a status update.
* $data->source: user doing the favoriting, in standard Twitter JSON format.
* $data->target: user whose status was favorited, in standard Twitter JSON format.
* $data->target_object: the favorited status update in standard Twitter JSON format.
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*
* 'unfavorite': Someone has unfavorited a status update.
* $data->source: user doing the unfavoriting, in standard Twitter JSON format.
* $data->target: user whose status was unfavorited, in standard Twitter JSON format.
* $data->target_object: the unfavorited status update in standard Twitter JSON format.
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*
*
* Meta information:
*
* 'friends':
* $data->friends: array of user IDs of the current user's friends.
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*
* 'delete': Advisory that a Twitter status has been deleted; nice clients
* should follow suit.
* $data->id: ID of status being deleted
* $data->user_id: ID of its owning user
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*
* 'scrub_geo': Advisory that a user is clearing geo data from their status
* stream; nice clients should follow suit.
* $data->user_id: ID of user
* $data->up_to_status_id: any notice older than this should be scrubbed.
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*
* 'limit': Advisory that tracking has hit a resource limit.
* $data->track
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*
* 'raw': receives the full JSON data for all message types.
*
* @param string $event
* @param callable $callback
*/
public function hookEvent($event, $callback)
{
$this->callbacks[$event][] = $callback;
}
/**
* Call event handler callbacks for the given event.
*
* @param string $event
* @param mixed $arg1 ... one or more params to pass on
*/
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protected function fireEvent($event, $arg1)
{
if (array_key_exists($event, $this->callbacks)) {
$args = array_slice(func_get_args(), 1);
foreach ($this->callbacks[$event] as $callback) {
call_user_func_array($callback, $args);
}
}
}
protected function handleJson(stdClass $data)
{
$this->routeMessage($data);
}
abstract protected function routeMessage(stdClass $data);
/**
* Send the decoded JSON object out to any event listeners.
*
* @param array $data
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* @param array $context optional additional context data to pass on
*/
protected function handleMessage(stdClass $data, array $context=array())
{
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$this->fireEvent('raw', $data, $context);
if (isset($data->text)) {
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$this->fireEvent('status', $data, $context);
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return;
}
if (isset($data->event)) {
$this->fireEvent($data->event, $data, $context);
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return;
}
if (isset($data->friends)) {
$this->fireEvent('friends', $data, $context);
}
$knownMeta = array('delete', 'scrub_geo', 'limit', 'direct_message');
foreach ($knownMeta as $key) {
if (isset($data->$key)) {
$this->fireEvent($key, $data->$key, $context);
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return;
}
}
}
}
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/**
* Multiuser stream listener for Twitter Site Streams API
* http://dev.twitter.com/pages/site_streams
*
* The site streams API allows listening to updates for multiple users.
* Pass in the user IDs to listen to in via followUser() -- note they
* must each have a valid OAuth token for the application ID we're
* connecting as.
*
* You'll need to be connecting with the auth keys for the user who
* owns the application registration.
*
* The user each message is destined for will be passed to event handlers
* in $context['for_user_id'].
*/
class TwitterSiteStream extends TwitterStreamReader
{
protected $userIds;
public function __construct(TwitterOAuthClient $auth, $baseUrl='http://betastream.twitter.com')
{
parent::__construct($auth, $baseUrl);
}
public function connect($method='2b/site.json')
{
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$params = array();
if ($this->userIds) {
$params['follow'] = implode(',', $this->userIds);
}
return parent::connect($method, $params);
}
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/**
* Set the users whose home streams should be pulled.
* They all must have valid oauth tokens for this application.
*
* Must be called before connect().
*
* @param array $userIds
*/
function followUsers($userIds)
{
$this->userIds = $userIds;
}
/**
* Each message in the site stream tells us which user ID it should be
* routed to; we'll need that to let the caller know what to do.
*
* @param array $data
*/
function routeMessage(stdClass $data)
{
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$context = array(
'source' => 'sitestream',
'for_user' => $data->for_user
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);
parent::handleMessage($data->message, $context);
}
}
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/**
* Stream listener for Twitter User Streams API
* http://dev.twitter.com/pages/user_streams
*
* This will pull the home stream and additional events just for the user
* we've authenticated as.
*/
class TwitterUserStream extends TwitterStreamReader
{
public function __construct(TwitterOAuthClient $auth, $baseUrl='https://userstream.twitter.com')
{
parent::__construct($auth, $baseUrl);
}
public function connect($method='2/user.json')
{
return parent::connect($method);
}
/**
* Each message in the user stream is just ready to go.
*
* @param array $data
*/
function routeMessage(stdClass $data)
{
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$context = array(
'source' => 'userstream'
);
parent::handleMessage($data, $context);
}
}