Posting to FaceBook feed using Graph API

Graph API was announced at F8 with a promise to dramatically simplify the FB API.

I checked the read access over the new interface during the presentations and to my big surprise it worked flawlessly and from the first time.

When I tried https://graph.facebook.com/facebook, JSON-formatted info about the FaceBook page was returned (as expected).

Then I tried OAuth 2.0 way of accessing the API to post a message to the feed.

And to my even bigger surprise it worked too!

Here is what you need to do to access Graph API over OAuth:

1. Create a FB app, store app properties to a file:

1. 
   
2. $appkey = '7925873fbfb5347e571744515a9d2804';
3. $appsecret = 'THE SECRET';
4. $canvas = 'http://apps.facebook.com/graphapi/';

2. Create a page that will prompt user the access permission (I am prompting for the publish_stream and offline_access permissions at the same time)

1. 
   
2. //http://apps.facebook.com/graphapi/
3. require 'settings.php';
4. 
   
5. $url = "https://graph.facebook.com/oauth/authorize?";
6. $url .= "client_id=$appid&";
7. $url .= "redirect_uri=$canvas/callback.php&";
8. $url .= "scope=publish_stream,offline_access";
9. $url .= "&type=user_agent&display=popup";
10. 
    
11. echo("$url");
12. 
    
    
    
    
    

3. Create a page to handle OAuth call-back with token and do the feed post:

1. 
   
2. require 'settings.php';
3. 
   
4. function
   callFb($url, $params) {
5. $ch = curl_init();
6. curl_setopt_array($ch, array(
7. CURLOPT_URL => $url,
8. CURLOPT_POSTFIELDS => http_build_query($params),
9. CURLOPT_RETURNTRANSFER => true,
10. CURLOPT_VERBOSE => true
11. ));
12. $result = curl_exec($ch);
13. curl_close($ch);
14. return $result;
15. }
16. 
    
17. $token = $_REQUEST['access_token'];
18. 
    
19. $hello = "Hello from Graph API";
20. $params=array('access_token'=>$token, 'message'=>$hello);
21. $url = "https://graph.facebook.com/me/feed";
22. callFb($url, $params);

P.S.

Important! Do not forget to select "new SDK" on the application settings page (I think that Facebook documentation fails to mention that)