posting in group on behalf of user using facebook graph API - php

Question

I am trying to post on behalf of user. I have used tutorial given on this page: http://25labs.com/updated-post-to-multiple-facebook-pages-or-groups-efficiently-v2-0/ .
I could successfully perform authentication but could not post on behalf.
Here is the source code : https://github.com/karimkhanp/fbPostOnBehalf
Testing can be done here: http://ec2-54-186-110-98.us-west-2.compute.amazonaws.com/fb/
Does any one experienced this?

Answer 1

I'm not familiar with the batch process that the tutorial is using but below is a code sample that posts to a Facebook group
<?php
# same this file as
# test.php
include_once "src/facebook.php";
$config = array(
'appId' => "YOURAPPID",
'secret' => "YOURAPPSECRET",
'allowSignedRequest' => false, // optional, but should be set to false for non-canvas apps
);
class PostToFacebook
{
private $facebook;
private $pages;
public function initialise($config){
$this->name = "Facebook";
// current necessary configs to set
// $config = array(
// 'appId' => FB_APP_ID,
// 'secret' => FB_APP_SECRET,
// 'allowSignedRequest' => false, // optional, but should be set to false for non-canvas apps
// );
$this->facebook = new Facebook($config);
try{
// if user removes app authorization
$this->hasAccess = $this->has_permissions();
if($this->hasAccess){
$this->groups = $this->getGroupData();
}
}
catch(Exception $err){
}
}
public function postMessageToGroup($message, $groupid){
$messageResponse = array(
'STATUS' => 0
);
$fbMessageObj = array(
"message" => strip_tags($message),
);
try
{
$user_page_post = $this->facebook->api("/$groupid/feed", 'POST', $fbMessageObj);
if($user_page_post && !empty($user_page_post['id'])){
$messageResponse['STATUS'] = 200;
$messageData = array(
'id' => $user_page_post['id'],
'link' => 'http://facebook.com/' . $user_page_post['id'],
);
$messageResponse['data'] = $messageData;
}
else{
$messageResponse['STATUS'] = 302;
}
}
catch(Exception $err){
$messageResponse['STATUS'] = 500;
$messageResponse['data'] = array($err);
}
return $messageResponse;
}
// TODO: should read a template somewhere
function show_login() {
$login_url = $this->facebook->getLoginUrl( array( 'scope' => implode(",",$this->permissions()) ));
return 'Login to Facebook and Grant Necessary Permissions';
}
// TODO: should read a template somewhere
public function toString()
{
if($this->hasAccess){
if($this->groups){
$msg = "";
$msg .= '<select name="group_id"><option value=""></option>';
foreach($this->groups as $group) {
$msg .= '<option value="' .
'' . urlencode($group['id']) .
'">' .
$group['name'] .
'</option>' .
'';
}
$msg .= '</select>';
return $msg;
}
else
return "No Groups";
}
else{
return $this->show_login();
}
}
function getGroupData(){
$raw = $this->facebook->api('/me/groups', 'GET');
$data = array();
if (null != $raw && array_key_exists('data', $raw))
return $raw['data'];
return null;
}
// check if current instance has access to facebook
function has_permissions() {
$user_id = #$this->facebook->getUser();
#print_r($user_id);
if($user_id == null) return false;
$permissions = $this->facebook->api("/me/permissions");
foreach($this->permissions() as $perm){
if( !array_key_exists($perm, $permissions['data'][0]) ) {
return false;
}
}
return true;
}
// permissins needed to post
function permissions(){
return array('manage_pages', 'user_groups');
}
}
$fb = new PostToFacebook();
$fb->initialise($config);
if(!$fb->has_permissions())
{
echo $fb->show_login();
}
else{
?>
<form method="post" action="test.php">
<textarea name='message'></textarea>
<?php echo $fb->toString(); ?>
<input type='submit'>
</form>
<?php
}
if(!empty($_POST)){
$response = $fb->postMessageToGroup($_POST['message'], $_POST['group_id']);
if($response['STATUS'] == 200)
print_r("<a href='" . $response['data']['link'] . "'>" . $response['data']['id'] ."</a>");
else
{
echo "ERROR!";
print_r($response);
}
}
?>