gnu-social/plugins/FacebookSSO/FacebookSSOPlugin.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* A plugin for single-sign-in (SSO) with Facebook
*
* PHP version 5
*
* 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 Pugin
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
exit(1);
}
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define("FACEBOOK_SERVICE", 2);
/**
* Main class for Facebook single-sign-on plugin
*
*
* Simple plugins can be implemented as a single module. Others are more complex
* and require additional modules; these should use their own directory, like
* 'local/plugins/{$name}/'. All files related to the plugin, including images,
* JavaScript, CSS, external libraries or PHP modules should go in the plugin
* directory.
*
* @category Plugin
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class FacebookSSOPlugin extends Plugin
{
public $appId = null; // Facebook application ID
public $secret = null; // Facebook application secret
public $facebook = null; // Facebook application instance
public $dir = null; // Facebook SSO plugin dir
/**
* Initializer for this plugin
*
* Plugins overload this method to do any initialization they need,
* like connecting to remote servers or creating paths or so on.
*
* @return boolean hook value; true means continue processing, false means stop.
*/
function initialize()
{
// Check defaults and configuration for application ID and secret
if (empty($this->appId)) {
$this->appId = common_config('facebook', 'appid');
}
if (empty($this->secret)) {
$this->secret = common_config('facebook', 'secret');
}
if (empty($this->facebook)) {
$this->facebook = new Facebook(
array(
'appId' => $this->appId,
'secret' => $this->secret,
'cookie' => true
)
);
}
return true;
}
/**
* Cleanup for this plugin
*
* Plugins overload this method to do any cleanup they need,
* like disconnecting from remote servers or deleting temp files or so on.
*
* @return boolean hook value; true means continue processing, false means stop.
*/
function cleanup()
{
return true;
}
/**
* Load related modules when needed
*
* Most non-trivial plugins will require extra modules to do their work. Typically
* these include data classes, action classes, widget classes, or external libraries.
*
* This method receives a class name and loads the PHP file related to that class. By
* tradition, action classes typically have files named for the action, all lower-case.
* Data classes are in files with the data class name, initial letter capitalized.
*
* Note that this method will be called for *all* overloaded classes, not just ones
* in this plugin! So, make sure to return true by default to let other plugins, and
* the core code, get a chance.
*
* @param string $cls Name of the class to be loaded
*
* @return boolean hook value; true means continue processing, false means stop.
*/
function onAutoload($cls)
{
$dir = dirname(__FILE__);
//common_debug("class = " . $cls);
switch ($cls)
{
case 'Facebook':
include_once $dir . '/extlib/facebook.php';
return false;
case 'FacebookloginAction':
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case 'FacebookregisterAction':
case 'FacebookadminpanelAction':
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case 'FacebooksettingsAction':
include_once $dir . '/' . strtolower(mb_substr($cls, 0, -6)) . '.php';
return false;
default:
return true;
}
}
/**
* Map URLs to actions
*
* This event handler lets the plugin map URLs on the site to actions (and
* thus an action handler class). Note that the action handler class for an
* action will be named 'FoobarAction', where action = 'foobar'. The class
* must be loaded in the onAutoload() method.
*
* @param Net_URL_Mapper $m path-to-action mapper
*
* @return boolean hook value; true means continue processing, false means stop.
*/
function onRouterInitialized($m)
{
// Always add the admin panel route
$m->connect('admin/facebook', array('action' => 'facebookadminpanel'));
// Only add these routes if an application has been setup on
// Facebook for the plugin to use.
if ($this->hasApplication()) {
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$m->connect(
'main/facebooklogin',
array('action' => 'facebooklogin')
);
$m->connect(
'main/facebookregister',
array('action' => 'facebookregister')
);
$m->connect(
'settings/facebook',
array('action' => 'facebooksettings')
);
}
return true;
}
/*
* Add a login tab for Facebook, but only if there's a Facebook
* application defined for the plugin to use.
*
* @param Action &action the current action
*
* @return void
*/
function onEndLoginGroupNav(&$action)
{
$action_name = $action->trimmed('action');
if ($this->hasApplication()) {
$action->menuItem(
common_local_url('facebooklogin'),
_m('MENU', 'Facebook'),
// TRANS: Tooltip for menu item "Facebook".
_m('Login or register using Facebook'),
'facebooklogin' === $action_name
);
}
return true;
}
/**
* Add a Facebook tab to the admin panels
*
* @param Widget $nav Admin panel nav
*
* @return boolean hook value
*/
function onEndAdminPanelNav($nav)
{
if (AdminPanelAction::canAdmin('facebook')) {
$action_name = $nav->action->trimmed('action');
$nav->out->menuItem(
common_local_url('facebookadminpanel'),
// TRANS: Menu item.
_m('MENU','Facebook'),
// TRANS: Tooltip for menu item "Facebook".
_m('Facebook integration configuration'),
$action_name == 'facebookadminpanel',
'nav_facebook_admin_panel'
);
}
return true;
}
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/*
* Add a tab for user-level Facebook settings
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*
* @param Action &action the current action
*
* @return void
*/
function onEndConnectSettingsNav(&$action)
{
if ($this->hasApplication()) {
$action_name = $action->trimmed('action');
$action->menuItem(
common_local_url('facebooksettings'),
// TRANS: Menu item tab.
_m('MENU','Facebook'),
// TRANS: Tooltip for menu item "Facebook".
_m('Facebook settings'),
$action_name === 'facebooksettings'
);
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}
return true;
}
/*
* Is there a Facebook application for the plugin to use?
*/
function hasApplication()
{
if (!empty($this->appId) && !empty($this->secret)) {
return true;
} else {
return false;
}
}
function onStartShowHeader($action)
{
// output <div id="fb-root"></div> as close to <body> as possible
$action->element('div', array('id' => 'fb-root'));
$session = $this->facebook->getSession();
$dir = dirname(__FILE__);
// XXX: minify this
$script = <<<ENDOFSCRIPT
window.fbAsyncInit = function() {
FB.init({
appId : %s,
session : %s, // don't refetch the session when PHP already has it
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
// whenever the user logs in, refresh the page
FB.Event.subscribe(
'auth.login',
function() {
window.location.reload();
}
);
};
(function() {
var e = document.createElement('script');
e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
e.async = true;
document.getElementById('fb-root').appendChild(e);
}());
ENDOFSCRIPT;
$action->inlineScript(
sprintf($script,
json_encode($this->appId),
json_encode($this->session)
)
);
return true;
}
/*
* Log the user out of Facebook, per the Facebook authentication guide
*
* @param Action action the action
*/
function onEndLogout($action)
{
$session = $this->facebook->getSession();
$fbuser = null;
$fbuid = null;
if ($session) {
try {
$fbuid = $this->facebook->getUser();
$fbuser = $this->facebook->api('/me');
} catch (FacebookApiException $e) {
common_log(LOG_ERROR, $e, __FILE__);
}
}
if (!empty($fbuser)) {
$logoutUrl = $this->facebook->getLogoutUrl(
array('next' => common_local_url('public'))
);
common_log(
LOG_INFO,
sprintf(
"Logging user out of Facebook (fbuid = %s)",
$fbuid
),
__FILE__
);
common_redirect($logoutUrl, 303);
}
}
/*
* Add fbml namespace so Facebook's JavaScript SDK can parse and render
* XFBML tags (e.g: <fb:login-button>)
*
* @param Action $action current action
* @param array $attrs array of attributes for the HTML tag
*
* @return nothing
*/
function onStartHtmlElement($action, $attrs) {
$attrs = array_merge($attrs, array('xmlns:fb' => 'http://www.facebook.com/2008/fbml'));
return true;
}
/*
* Add version info for this plugin
*
* @param array &$versions plugin version descriptions
*/
function onPluginVersion(&$versions)
{
$versions[] = array(
'name' => 'Facebook Single-Sign-On',
'version' => STATUSNET_VERSION,
'author' => 'Zach Copley',
'homepage' => 'http://status.net/wiki/Plugin:FacebookSSO',
'rawdescription' =>
_m('A plugin for single-sign-on with Facebook.')
);
return true;
}
}