Facebook Application Tab -> External Linking with PHP
I currently have an Application on the Facebook Tab, and am wondering if there is a way for me to deep link into an item on that app tab. Example:
User is in the application (which is searching books), finds a book they like, and wants to share it with a friend. They click to share it, and I can pull all the info, however I don't have a deep link so when it's emailed, facebooked, ect.. it sends the user directly to the page with it on it.
Is this possible on the Application Tab? I know on the canvas I could deep link fine... but loo开发者_Go百科king for a way to do it on the App Tab.
Thank you for your thought and responses.
Here's how we deep link to subpages within our app's Page Tab.
When your application lives inside a Page Tab, Facebook will strip out all GET params except for app_data. It passes app_data inside the signed_request parameter of the POST data.
More info in the docs: https://developers.facebook.com/docs/authentication/signed_request/
So when we build links to subpages, it will look something like
http://www.facebook.com/myfanpage?sk=app_XXXXXX&app_data=%2Fmainpage%2Fsubpage
Then, in our index page code, we check for the app_data param. If it exists, then a simple 302 redirect does the trick.
$request = parse_signed_request($_POST['signed_request']);
if ($request['app_data'])
{
header('HTTP/1.1 302 Found');
header('Location: {$request['app_data']}');
exit;
}
Note: you can pass more than 1 param inside of app_data using a URL-encoded, JSON-array or something like that.
Perhaps.
For Application Canvas Pages, Facebook forwards any addition URI information to your canvas callback.
For example, if your app page is http://apps.facebook.com/testapp
and your canvas callback is http://facebook.example.com/testapp/canvas
Then going to http://apps.facebook.com/testapp/foo?bar=baz would result in facebook's servers hitting yours like so http://facebook.example.com/testapp/canvas/foo?bar=baz.
I've never tested it to see if application tabs share this behavior, but it's worth a shot. If so, you could just use URI information to drive your deeplinking.
Also, you should be aware of the impending changes to application tabs.
For those that need a full (yet minimal working) example (like myself) here is the index.php which does the deep-linking when needed. Make sure you've downloaded the Facebook PHP SDK and that your require path points to it. (Obviously, you also need to replace the $app_id and $app_secret with your own app info.)
<?php
require 'facebook-php-sdk/src/facebook.php';
$app_id = "YOUR_APP_ID_HERE";
$app_secret = "YOUR_APP_SECRET_ID_HERE";
$facebook = new Facebook(array(
'appId' => $app_id,
'secret' => $app_secret
));
$signed_request = $facebook->getSignedRequest();
// Get app_data from signed request POST
$app_data = $signed_request["app_data"];
// Parse app_data & Re-direct
if ($app_data) {
header("HTTP/1.1 302 Found");
header("Location: {$app_data}");
exit;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns:fb="http://www.facebook.com/2008/fbml" xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Title Here</title>
</head>
<body>
<h1>Landing Page</h1>
</body>
</html>
Also, make sure that within your FB App Settings, all your URL paths (i.e. Canvas URL, Page Tab URL, etc) end with a backslash, or else you'll get some 301 redirect errors.
Once your app is setup and you've added it your fan page, you can deep link with something like:
http://www.facebook.com/pages/MYFANPAGE/XXXXX?sk=app_XXXXX&app_data=sub/another.php
You may have to parse the actual app_data value before using it, but for me it worked just as above.
Hope that helps others out there. Of course, Facebook may change all this at any time.
So far, we have not been able to deep link to an application Tab using URL parameters.
We are able to retrieve window.location information from an application page (e.g. http://apps.facebook.com/testapp/foo?bar=bar)
This does not work on an app Tab (e.g. http://www.facebook.com/testpage?v=app_1234&bar=bar)
Similarly, we cannot use $_GET['foo'] to try to grab it server-side if we are in a Facebook tab.
If anyone has managed to get around this, I'd love to know the solution.
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