gnu-social/plugins/FacebookSSO/lib/facebookclient.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Class for communicating with Facebook
*
* 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 Craig Andrews <candrews@integralblue.com>
* @author Zach Copley <zach@status.net>
* @copyright 2009-2010 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/
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* Class for communication with Facebook
*
* @category Plugin
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class Facebookclient
{
protected $facebook = null; // Facebook Graph client obj
protected $flink = null; // Foreign_link StatusNet -> Facebook
protected $notice = null; // The user's notice
protected $user = null; // Sender of the notice
//protected $oldRestClient = null; // Old REST API client
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function __construct($notice)
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{
$this->facebook = self::getFacebook();
$this->notice = $notice;
$this->flink = Foreign_link::getByUserID(
$notice->profile_id,
FACEBOOK_SERVICE
);
$this->user = $this->flink->getUser();
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}
/*
* Get an instance of the Facebook Graph SDK object
*
* @param string $appId Application
* @param string $secret Facebook API secret
*
* @return Facebook A Facebook SDK obj
*/
static function getFacebook($appId = null, $secret = null)
{
// Check defaults and configuration for application ID and secret
if (empty($appId)) {
$appId = common_config('facebook', 'appid');
}
if (empty($secret)) {
$secret = common_config('facebook', 'secret');
}
// If there's no app ID and secret set in the local config, look
// for a global one
if (empty($appId) || empty($secret)) {
$appId = common_config('facebook', 'global_appid');
$secret = common_config('facebook', 'global_secret');
}
return new Facebook(
array(
'appId' => $appId,
'secret' => $secret,
'cookie' => true
)
);
}
/*
* Broadcast a notice to Facebook
*
* @param Notice $notice the notice to send
*/
static function facebookBroadcastNotice($notice)
{
common_debug('Facebook broadcast');
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$client = new Facebookclient($notice);
return $client->sendNotice();
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}
/*
* Should the notice go to Facebook?
*/
function isFacebookBound() {
if (empty($this->flink)) {
common_log(
LOG_WARN,
sprintf(
"No Foreign_link to Facebook for the author of notice %d.",
$this->notice->id
),
__FILE__
);
return false;
}
// Avoid a loop
if ($this->notice->source == 'Facebook') {
common_log(
LOG_INFO,
sprintf(
'Skipping notice %d because its source is Facebook.',
$this->notice->id
),
__FILE__
);
return false;
}
// If the user does not want to broadcast to Facebook, move along
if (!($this->flink->noticesync & FOREIGN_NOTICE_SEND == FOREIGN_NOTICE_SEND)) {
common_log(
LOG_INFO,
sprintf(
'Skipping notice %d because user has FOREIGN_NOTICE_SEND bit off.',
$this->notice->id
),
__FILE__
);
return false;
}
// If it's not a reply, or if the user WANTS to send @-replies,
// then, yeah, it can go to Facebook.
if (!preg_match('/@[a-zA-Z0-9_]{1,15}\b/u', $this->notice->content) ||
($this->flink->noticesync & FOREIGN_NOTICE_SEND_REPLY)) {
return true;
}
return false;
}
/*
* Determine whether we should send this notice using the Graph API or the
* old REST API and then dispatch
*/
function sendNotice()
{
// If there's nothing in the credentials field try to send via
// the Old Rest API
if ($this->isFacebookBound()) {
common_debug("notice is facebook bound", __FILE__);
if (empty($this->flink->credentials)) {
$this->sendOldRest();
} else {
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// Otherwise we most likely have an access token
$this->sendGraph();
}
} else {
common_debug(
sprintf(
"Skipping notice %d - not bound for Facebook",
$this->notice->id,
__FILE__
)
);
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}
}
/*
* Send a notice to Facebook using the Graph API
*/
function sendGraph()
{
try {
$fbuid = $this->flink->foreign_id;
common_debug(
sprintf(
"Attempting use Graph API to post notice %d as a stream item for %s (%d), fbuid %s",
$this->notice->id,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
$params = array(
'access_token' => $this->flink->credentials,
'message' => $this->notice->content
);
$attachments = $this->notice->attachments();
if (!empty($attachments)) {
// We can only send one attachment with the Graph API
$first = array_shift($attachments);
if (substr($first->mimetype, 0, 6) == 'image/'
|| in_array(
$first->mimetype,
array('application/x-shockwave-flash', 'audio/mpeg' ))) {
$params['picture'] = $first->url;
$params['caption'] = 'Click for full size';
$params['source'] = $first->url;
}
}
$result = $this->facebook->api(
sprintf('/%s/feed', $fbuid), 'post', $params
);
} catch (FacebookApiException $e) {
return $this->handleFacebookError($e);
}
return true;
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}
/*
* Send a notice to Facebook using the deprecated Old REST API. We need this
* for backwards compatibility. Users who signed up for Facebook bridging
* using the old Facebook Canvas application do not have an OAuth 2.0
* access token.
*/
function sendOldRest()
{
try {
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$canPublish = $this->checkPermission('publish_stream');
$canUpdate = $this->checkPermission('status_update');
// We prefer to use stream.publish, because it can handle
// attachments and returns the ID of the published item
if ($canPublish == 1) {
$this->restPublishStream();
} else if ($canUpdate == 1) {
// as a last resort we can just update the user's "status"
$this->restStatusUpdate();
} else {
$msg = 'Not sending notice %d to Facebook because user %s '
. '(%d), fbuid %s, does not have \'status_update\' '
. 'or \'publish_stream\' permission.';
common_log(
LOG_WARNING,
sprintf(
$msg,
$this->notice->id,
$this->user->nickname,
$this->user->id,
$this->flink->foreign_id
),
__FILE__
);
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}
} catch (FacebookApiException $e) {
return $this->handleFacebookError($e);
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}
return true;
}
/*
* Query Facebook to to see if a user has permission
*
*
*
* @param $permission the permission to check for - must be either
* public_stream or status_update
*
* @return boolean result
*/
function checkPermission($permission)
{
if (!in_array($permission, array('publish_stream', 'status_update'))) {
throw new ServerException("No such permission!");
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}
$fbuid = $this->flink->foreign_id;
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common_debug(
sprintf(
'Checking for %s permission for user %s (%d), fbuid %s',
$permission,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
$hasPermission = $this->facebook->api(
array(
'method' => 'users.hasAppPermission',
'ext_perm' => $permission,
'uid' => $fbuid
)
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);
if ($hasPermission == 1) {
common_debug(
sprintf(
'%s (%d), fbuid %s has %s permission',
$permission,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
return true;
} else {
$logMsg = '%s (%d), fbuid $fbuid does NOT have %s permission.'
. 'Facebook returned: %s';
common_debug(
sprintf(
$logMsg,
$this->user->nickname,
$this->user->id,
$permission,
$fbuid,
var_export($result, true)
),
__FILE__
);
return false;
}
}
/*
* Handle a Facebook API Exception
*
* @param FacebookApiException $e the exception
*
*/
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function handleFacebookError($e)
{
$fbuid = $this->flink->foreign_id;
$errmsg = $e->getMessage();
$code = $e->getCode();
// The Facebook PHP SDK seems to always set the code attribute
// of the Exception to 0; they put the real error code it in
// the message. Gar!
if ($code == 0) {
preg_match('/^\(#(?<code>\d+)\)/', $errmsg, $matches);
$code = $matches['code'];
}
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// XXX: Check for any others?
switch($code) {
case 100: // Invalid parameter
$msg = 'Facebook claims notice %d was posted with an invalid '
. 'parameter (error code 100 - %s) Notice details: '
. '[nickname=%s, user id=%d, fbuid=%d, content="%s"]. '
. 'Dequeing.';
common_log(
LOG_ERR, sprintf(
$msg,
$this->notice->id,
$errmsg,
$this->user->nickname,
$this->user->id,
$fbuid,
$this->notice->content
),
__FILE__
);
return true;
break;
case 200: // Permissions error
case 250: // Updating status requires the extended permission status_update
$this->disconnect();
return true; // dequeue
break;
case 341: // Feed action request limit reached
$msg = '%s (userid=%d, fbuid=%d) has exceeded his/her limit '
. 'for posting notices to Facebook today. Dequeuing '
. 'notice %d';
common_log(
LOG_INFO, sprintf(
$msg,
$user->nickname,
$user->id,
$fbuid,
$this->notice->id
),
__FILE__
);
// @fixme: We want to rety at a later time when the throttling has expired
// instead of just giving up.
return true;
break;
default:
$msg = 'Facebook returned an error we don\'t know how to deal with '
. 'when posting notice %d. Error code: %d, error message: "%s"'
. ' Notice details: [nickname=%s, user id=%d, fbuid=%d, '
. 'notice content="%s"]. Dequeing.';
common_log(
LOG_ERR, sprintf(
$msg,
$this->notice->id,
$code,
$errmsg,
$this->user->nickname,
$this->user->id,
$fbuid,
$this->notice->content
),
__FILE__
);
return true; // dequeue
break;
}
}
/*
* Publish a notice to Facebook as a status update
*
* This is the least preferable way to send a notice to Facebook because
* it doesn't support attachments and the API method doesn't return
* the ID of the post on Facebook.
*
*/
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function restStatusUpdate()
{
$fbuid = $this->flink->foreign_id;
common_debug(
sprintf(
"Attempting to post notice %d as a status update for %s (%d), fbuid %s",
$this->notice->id,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
$result = $this->facebook->api(
array(
'method' => 'users.setStatus',
'status' => $this->notice->content,
'status_includes_verb' => true,
'uid' => $fbuid
)
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);
common_log(
LOG_INFO,
sprintf(
"Posted notice %s as a status update for %s (%d), fbuid %s",
$this->notice->id,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
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}
/*
* Publish a notice to a Facebook user's stream using the old REST API
*/
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function restPublishStream()
{
$fbuid = $this->flink->foreign_id;
common_debug(
sprintf(
'Attempting to post notice %d as stream item for %s (%d) fbuid %s',
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$this->notice->id,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
$fbattachment = $this->formatAttachments();
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$result = $this->facebook->api(
array(
'method' => 'stream.publish',
'message' => $this->notice->content,
'attachment' => $fbattachment,
'uid' => $fbuid
)
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);
common_log(
LOG_INFO,
sprintf(
'Posted notice %d as a %s for %s (%d), fbuid %s',
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$this->notice->id,
empty($fbattachment) ? 'stream item' : 'stream item with attachment',
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$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
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}
/*
* Format attachments for the old REST API stream.publish method
*
* Note: Old REST API supports multiple attachments per post
*
*/
function formatAttachments()
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{
$attachments = $this->notice->attachments();
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$fbattachment = array();
$fbattachment['media'] = array();
foreach($attachments as $attachment)
{
if($enclosure = $attachment->getEnclosure()){
$fbmedia = $this->getFacebookMedia($enclosure);
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}else{
$fbmedia = $this->getFacebookMedia($attachment);
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}
if($fbmedia){
$fbattachment['media'][]=$fbmedia;
}else{
$fbattachment['name'] = ($attachment->title ?
$attachment->title : $attachment->url);
$fbattachment['href'] = $attachment->url;
}
}
if(count($fbattachment['media'])>0){
unset($fbattachment['name']);
unset($fbattachment['href']);
}
return $fbattachment;
}
/**
* given a File objects, returns an associative array suitable for Facebook media
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*/
function getFacebookMedia($attachment)
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{
$fbmedia = array();
if (strncmp($attachment->mimetype, 'image/', strlen('image/')) == 0) {
$fbmedia['type'] = 'image';
$fbmedia['src'] = $attachment->url;
$fbmedia['href'] = $attachment->url;
} else if ($attachment->mimetype == 'audio/mpeg') {
$fbmedia['type'] = 'mp3';
$fbmedia['src'] = $attachment->url;
}else if ($attachment->mimetype == 'application/x-shockwave-flash') {
$fbmedia['type'] = 'flash';
// http://wiki.developers.facebook.com/index.php/Attachment_%28Streams%29
// says that imgsrc is required... but we have no value to put in it
// $fbmedia['imgsrc']='';
$fbmedia['swfsrc'] = $attachment->url;
}else{
return false;
}
return $fbmedia;
}
/*
* Disconnect a user from Facebook by deleting his Foreign_link.
* Notifies the user his account has been disconnected by email.
*/
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function disconnect()
{
$fbuid = $this->flink->foreign_id;
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common_log(
LOG_INFO,
sprintf(
'Removing Facebook link for %s (%d), fbuid %s',
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
$result = $this->flink->delete();
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if (empty($result)) {
common_log(
LOG_ERR,
sprintf(
'Could not remove Facebook link for %s (%d), fbuid %s',
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
common_log_db_error($flink, 'DELETE', __FILE__);
}
// Notify the user that we are removing their Facebook link
$result = $this->mailFacebookDisconnect();
if (!$result) {
$msg = 'Unable to send email to notify %s (%d), fbuid %s '
. 'about his/her Facebook link being removed.';
common_log(
LOG_WARNING,
sprintf(
$msg,
$this->user->nickname,
$this->user->id,
$fbuid
),
__FILE__
);
}
}
/**
* Send a mail message to notify a user that her Facebook link
* has been terminated.
*
* @return boolean success flag
*/
function mailFacebookDisconnect()
{
$profile = $user->getProfile();
$siteName = common_config('site', 'name');
common_switch_locale($user->language);
$subject = sprintf(
_m('Your Facebook connection has been removed'),
$siteName
);
$msg = <<<BODY
Hi, %1$s. We're sorry to inform you we are unable to publish your notice to
Facebook, and have removed the connection between your %2$s account and Facebook.
This may have happened because you have removed permission for %2$s to post on
your behalf, or perhaps you have deactivated your Facebook account. You can
reconnect your %s account to Facebook at any time by logging in with Facebook
again.
BODY;
$body = sprintf(
_m($msg),
$this->user->nickname,
$siteName
);
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common_switch_locale();
return mail_to_user($this->user, $subject, $body);
}
}