facebook php SDK, publish_stream OAuthException: (#200) - php

Question

I know this error has been bitten to death over here, and I read every single one to have better understanding of my problem.
But my issue is a bit different, and I wonder if anyone can give me good suggestion where to look.
I'm using wordpress + wordpress social login. This plugin authenticates user and stores name/age/email/fbID/fbProfilePic in the DB.
I've a little feature on my website where users registered through facebook can click and post message to the their wall.
My code looks like this:
<?php
//IF user is registered via facebook, when he clicks INTERESTED message will appear on his/her wall to spread the news
$user = get_user_meta($current_user->ID,'Facebook',true);
if ($user && $_GET['commentstab'] == 1 && !$_POST['delmycom']) {
require ('Facebook/facebook.php');
//Access details
$facebook = new Facebook(array(
'appId' => 'XXX',
'secret' => 'XXX'
//'cookie' => true
));
//try {
$params = array(
'message' => "Hurray! This works :)",
'name' => "This is my title",
'caption' => "My Caption",
'description' => "Some Description...",
'link' => "http://stackoverflow.com",
'picture' => "http://i.imgur.com/VUBz8.png",
);
$post = $facebook->api("/$user/feed","POST",$params);
echo "Your post was successfully posted to UID: $user";
//} //try
//catch (FacebookApiException $e) {
// $result = $e->getResult();
//} //catch
} //master if
?>
I read in various topics that I need publish_stream permission from user to perform this action. But since I store user info separately in my own DB, how do I get this publish stream permission? Do I need to modify wordpress plugin to store some kind of access token? and utilize this token to post to wall?

Answer 1

you generate loginurl with publish_stream permission
if user is not logged in with permission, you have to make sure he does
redirect user to proper page
you can do it like this,
<?php
include_once("facebook.php");
$facebook = new Facebook(array(
'appId' => APP_ID,
'secret' => APP_SECRET,
'cookie' => true,
));
$user = $facebook->getUser();
if ($user) {
try {
// Get the user profile data you have permission to view
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
$user = null;
}
} else {
$loginUrl = $facebook->getLoginUrl(array('scope' =>'publish_stream','redirect_uri'=>'example.com'));
die('<script> top.location.href="'.$loginUrl.'";</script>');
}
$params = array(
'message' => "Hurray! This works :)",
'name' => "This is my title",
'caption' => "My Caption",
'description' => "Some Description...",
'link' => "http://stackoverflow.com",
'picture' => "http://i.imgur.com/VUBz8.png",
);
$post = $facebook->api("/$user/feed","POST",$params);
?>