BitYip

The goal here is to make a one-click button which will do the following.

- Determine if the user is logged into Facebook, and if not present them with a login session.
- Ask user for permission to post to their wall.
- Post a pre-determined message to the user’s wall

Luckily, this is all really easy using the Facebook Graph API.  There is a well written Facebook PHP SDK of the api implemented, that’s what I’m using.

First, you’ll need to register your app with facebook, somewhere here:
http://www.facebook.com/developers/apps.php
You’ll receive an App Id and a App Secret from facebook.

Next, download the php sdk to your webserver:

$ curl -L http://github.com/facebook/php-sdk/tarball/master | tar xvz

Make sure to include facebook.php.

echo "Posting to facebook..";

require './fb_src/facebook.php';

$facebook = new Facebook(array(
  'appId'  => 'YOUR_APP_ID',
  'secret' => 'YOUR_SECRET',
  'cookie' => true,
));

$session = $facebook->getSession();
$me = null;
if ($session) {
  try {
    $uid = $facebook->getUser();
    $me = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    header('Location: ' . $facebook->getLoginUrl(array('req_perms' => 'publish_stream')));
    error_log($e);
  }
}
else {
  header('Location: ' . $facebook->getLoginUrl(array('req_perms' => 'publish_stream')));
}

print_r($me);

try {
  $feed = $facebook->api('/me/feed', 'post', array('message' => 'Hello world!', 'cb' => ''));
} catch (FacebookApiException $e) {
  print($e);
}
print_r($feed);

The above code will do just that, log in and post “Hello World!” to the user’s wall.

Useful links:

http://thinkdiff.net/facebook/php-sdk-graph-api-base-facebook-connect-tutorial/
http://developers.facebook.com/docs/reference/api/post/

Posted in PHP |

The goal here is to retrieve a list of contacts, a list of groups, and organize them for presentation to the user with one request. Therefore we can’t use a single-use AuthSub token as in the previous post, but must upgrade to a secure session.

Info on retrieving groups here.

Format of XML for parsing group membership data from a contact entry here. Thus the name of the child node in the xml document we’re looking for is “groupmembershipinfo”, and the “href” attribute will contain the group id.

We need to make two requests. The first for the list of the user’s groups. From this we parse the group id and the group title to present to the user.

The second it the list of all contacts. In this list each contact entry will be associated with a group id, but not the group title, which is why need to make the first request.

Recommend making a AuthSubSession so the user doesn’t have to click “Allow” twice.

In order to do this, you must sign your token properly, info here: http://code.google.com/apis/accounts/docs/AuthSub.html#signingrequests

First you’ll need to create a certificate, follow this: http://www.ipsec-howto.org/x595.html
Then you can find some example php code here: http://gdatatips.blogspot.com/2008/07/secure-authsub-in-php.html
There is also a blog entry for using the Zend library instead of curl.

Posted in PHP |

Using the Gmail Data API to get contacts is really easy. The documentation is found here: http://code.google.com/apis/contacts/docs/3.0/developers_guide_protocol.html
Though I found it a bit lacking.

First, you need to register your domain with google, here:
https://www.google.com/accounts/ManageDomains

Your link should look something like this; requests the user to login, or simply grant permission to access their contacts if already logged in.

Note the ‘next=”http//www.example.com/foo?provider=gmail”‘ parameter. This must be the same as the the page set above in Google Accounts Domain Management page. This requests a one-time use token which you can now exchange for contacts. Token will be in the URL as ‘token=”xxxx”‘:

 $auth = $_GET['token'];

 $curl_headers = array();
 $curl_headers[] = 'Authorization: AuthSub token="'. $auth .'"';

 $ch = curl_init("https://www.google.com/m8/feeds/contacts/default/full?max-results=10000");
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
 curl_setopt($ch, CURLOPT_HTTPGET, true);
 curl_setopt($ch, CURLOPT_FAILONERROR, true);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_HTTPHEADER, $curl_headers);

 $res = curl_exec($ch);
 print_r($res);
 curl_close($ch);

Quick, simple, and easy!

Posted in PHP |