Seems like Facebook changed a lot of things recently. I would like to know how to show a custom page if the user has not liked the Fan page. If the user likes the page I will show them the Fan page wall. How to do this? I searched around but seems like Facebook reinvented itself.
Thanks.
You should be able to change what a visitor sees in your page settings...
manage permissions
- default landing tab ( pick your page here )
also -
I created this php script that shows like and non-like content to users.
Tutorial / Example
http://www.drewdahlman.com/meusLabs/?p=100
GIT Project
https://github.com/DrewDahlman/FBVersion
$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
if (empty($data["page"]["liked"])) {
//User is not a fan
}
Source: Determine If The User Likes (Fan Of) Your Facebook Page When Landing On Your Page Tab
Related
I've done a lot of searching and I've found outdated tutorials that don't work...
I have a site made with PHP and when I submit a particular form in my admin area, I want to publish to my Facebook "fan page"
There is no RSS available, so do you have any example to directly post to the Facebook fan page (not user wall) using php sdk?
Thank you!
Finally, after a lot of tests, it worked, without the PHP SDK. This is the step by step guide:
1. Get permissions and the page token
Go to https://developers.facebook.com/tools/explorer/ and select your app from the first drop down menu, in the left.
Click on the button "Get access token", and in the "Select Permissions" window, click in "Extended Permissions" and check manage_pages and publish_stream, and click in "Get Access Token" blue button.
You may be asked in this step to grant permissions to your app to access to your Facebook account, accept.
Next, click at the end of the text field next to the "GET" drop down, and replace the numbers for: me/accounts, and click in the blue button next to this text field.
You'll get the tokens for all your pages, including your app page. Find your page name in the list, will look like this: "name": "Your page name"
When you located your page, copy the access token for the page (will be really long), that can look like this: "access_token": "XXXXXXXX". Also copy the id of the page: "id": "XXXXX".
That's all for this step, we can start coding now.
2. Post to your page wall via PHP
First, for this script, you'll need a server supporting curl.
We start the PHP document defining the page access token and the page id that we've get in the 1st step:
<?php
$page_access_token = 'XXXXXXX';
$page_id = 'YYYYYYYY';
After that, we create an array with the info to post to our page wall:
$data['picture'] = "http://www.example.com/image.jpg";
$data['link'] = "http://www.example.com/";
$data['message'] = "Your message";
$data['caption'] = "Caption";
$data['description'] = "Description";
You can of course, use any other post parameter described in https://developers.facebook.com/docs/reference/api/post/ and if you don't need one or many of the parameters above you can simply delete it.
Ok, At this point we add to the array the access token:
$data['access_token'] = $page_access_token;
And we set our post URL, to post in our page:
$post_url = 'https://graph.facebook.com/'.$page_id.'/feed';
And the last step, we'll use a curl to post our message in our page wall:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $post_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$return = curl_exec($ch);
curl_close($ch);
?>
After that, we can save our PHP document, and try to execute it. The post may appear in our Facebook page.
Hope this code helps to other people with the same problem!
You can test tokens using
Facebook Access Token Debugger
Working solution for API v.2.5
Get code for app_id as parameter of response_uri
https://www.facebook.com/dialog/oauth?client_id=".$app_id."&redirect_uri=".$response_uri."&response_type=code&scope=manage_pages,publish_pages
Get access_token based on code, app_id and app_secret as result of response_uri
https://graph.facebook.com/oauth/access_token?grant_type=authorization_code&client_id=".$app_id."&client_secret=".$app_secret."&code=".$code."&redirect_uri=".$response_uri
Get never expiring page_access_token for page_id based on access_token
https://graph.facebook.com/v2.5/".$page_id."?fields=access_token&access_token=".$access_token
As an addition to nmarti answer. Valid for API v.2.4.
If you don't want to go Facebook API console, rather do API calls, there are some instructions.
First of all, you have to have Facebook user, being admin on the page you want to post, also you have to create Facebook App in order to proceed.
Do login request, to get user token:
https://www.facebook.com/dialog/oauth?client_id=%app-id%&redirect_uri=%your-site-url%&response_type=token&scope=manage_pages,publish_pages
In response, you should get %user-token%, save it, you will need in the next step.
Read More
Ask for long lived token:
https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&client_id=%app-id%&client_secret=%app-secret%&fb_exchange_token=%user-token%
Now you will have %long-lived-token%, required to get long lived page token.
Read More
Now, get a list of your Facebook Pages,
https://graph.facebook.com/v2.4/%page-admin-user-id%/accounts/?access_token=%long-lived-token%
Find in the list your Page, and a page token, now you can continue with posting to page using nmarti example.
Also Facebook says:
The resulting page access token will not have any expiry time.
Read More
Here is the resource you are looking for. Scroll down to Page Login and read from there.
You have to get an access token for your page and then use that token when posting. This is assuming that you want your post to appear "from the page". IE - posting as if you were the page.
the actual call to the graph api to create a post object, and how to do it, can be found at this url from the facebook documentation.
I have a problem..
I try wrote program like as facebook page tab app.
I must use session for remember signed_request.
But issue is that Safari do not remember session.
Program is:
$facebook = new Facebook($config);
if (isset($_REQUEST['signed_request'])) {
$encoded_sig = null;
$payload = null;
list($encoded_sig, $payload) = explode('.', $_REQUEST['signed_request'], 2);
$sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
$signed_request = json_decode(base64_decode(strtr($payload, '-_', '+/'), true),true);
$op=True;
}else {
$op=False;
}
if($op)
{
$_SESSION['liked']=$signed_request['page']['liked'];
$_SESSION['admin']=$signed_request['page']['admin'];
}else{
$url="PAGEAPP URL";
echo("<script> top.location.href='" . $url . "'</script>");
exit();
}
Safari does not allow cross domain cookies.
As the main page is of the domain Facebook.com and your iframe domain differs, Safari will not process cookies inside the iFrame.
Although there are workarounds for other browsers, and at one point there was a workaround for Safari, it seems Apple closed this loophole.
http://anantgarg.com/2010/02/18/cross-domain-cookies-in-safari/
Setting cross-domain cookies in Safari
Although I can't see your full code & scenario, I would suggest you avoid using sessions, and always query the Facebook API to check for the 'liked' & 'admin' flags.
If a user's admin privileges were revoked, or a user disliked the page, then your SESSION variables would become out of sync (unless you are constantly updating your SESSION variables).
Check if a user liked the page:
How to check if current facebook user like a page using PHP SDK?
Check if a user is an admin:
How to get if a user is admin of a page (isAdmin) using the Facebook Graph API?
I have an application on facebook that has worked for a month, but now I get the page in the application blank to enter it.
The application using the debugger get the error 803:
"Error":
"Message": "(# 803) Some of the aliases you do not exist Requested: bloggsamigos"
"Type": "OAuthException"
"Code": 803
If acceds directly see the message "the application is blocked because of problems with an external programmer."
What confuses me is that it has worked perfectly and I have not touched anything.
The application shows some pictures coming out of a query to a database hosted on the same domain. It's a blog of images. I have an administrator outside of facebook online application and show these images run from the administrator.
in index.php page, I control the user has the "like" activated to display a page or other. my code is this:
require 'src/facebook.php';
$config = array();
$config['appId'] ="xxxxxxxxxxxxxxx";
$config['secret'] = "xxxxxxxxxxxxxxxxxxxxxxxxxxx";
$facebook = new Facebook($config);
if (isset($_REQUEST['signed_request'])) {
$encoded_sig = null;
$payload = null;
list($encoded_sig, $payload) = explode('.', $_REQUEST['signed_request'], 2);
$sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
$signed_request = json_decode(base64_decode(strtr($payload, '-_', '+/'), true),true);
} else { echo "ERROR"; }
$lied = $signed_request['page']['liked'];
if ($signed_request['page']['liked']) {
include("fan.php");
}
else {
include("nofan.php");
}
configuration data are:
Namespace App --> bloggsamigos
Site URL --> with (http://www) mahesoblogsamigos.com/
Site Domain --> with (http://www) mahesoblogsamigos.com
Work Page --> with (http://) apps.facebook.com/bloggsamigos/
URL of the canvas --> with (https://) ssl15.ovh.net/~mahesobl/
Secure URL Canvas --> with (https://) ssl15.ovh.net/~mahesobl/
Canvas FBML / iframe --> iframe
I'm desperate, I tried many things, I wanted information, I sent emails to facebook, but I can not help. You can help me, please! I'll be very grateful.
Try changing the namespace to something else...
http://graph.facebook.com/bloggsamigos shows: "(#803) Some of the aliases you requested do not exist: bloggsamigos" meaning that facebook is not able to figure out what application that namespace matches with. Chances are something got messed up on Facebook's side.
If you really want that namespace, you may be able to change it to something else and then change it back to that to hopefully get it to record the information correctly.
You can also try filing a bug at http://developers.facebook.com/bugs but don't be surprised if you have to wait for weeks or months for a response.
Going to http://apps.facebook.com/bloggsamigos/ also shows a message saying "The app "Bloggs Amigos" is temporarily unavailable due to an issue with its third-party developer. We are investigating the situation and apologize for any inconvenience." However, that could mean almost anything.
How to make only https facebook app?
Couse this code:
$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
if(empty($data["page"]["liked"]))
work in only https.
Thanks for answer.
Only put a HTTPS/secure url in the Application (Canvas or App) Settings.
Leave the Canvas URL blank. And the Secure Canvas URL Populated.
In addition you can configure your server to Redirect Non HTTP Requests to HTTPS so your Application only servers over HTTPS.
-- Additional
Given your code only works over HTTPS it seems requests to HTTP are being redirected to HTTPS which in my experience tends to drop $_POST'ed data during the redirect as is the case when Facebook loads your App.
Which is why your code trips up because the $_REQUEST is blank/signed_request is missing.
I am writing an application in Facebook that is meant to be shown through a page tab on my own business page. I need to interact with the viewing user, thus I require extended rights.
I've followed the suggested procedure but have now hit a wall. My application sits in an iFrame and the request for extended rights uses redirection. I can get the page where you need to confirm authorization but when you click allow, Facebook redirects to the page where my application is hosted instead of back to my Facebook page tab. Once the proper rights have been authorized, the rest of the application works fine so I know it's just a problem with redirection but I feel like I've tried everything and not a lot of people seem to have had the same problem. I would love if anyone could point me in the right direction.
Thank you!
Here's my code:
$app_id = "myappid";
$canvas_page = "http://wheremyappishosted/";
$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
$user_id = $data["user_id"];
$access_token = $data['oauth_token'];
if (empty($data["user_id"])) {
$auth_url = "https://graph.facebook.com/oauth/authorize?client_id=".$app_id."&redirect_uri=".urlencode($canvas_page)."&scope=user_photos,friends_photos,publish_stream,user_likes";
die("<script> top.location.href='" . $auth_url . "'</script>");
}
$f = json_decode(file_get_contents("https://graph.facebook.com/".$user_id."?access_token=".$access_token."&fields=name,albums,likes"), true);
For those interested, I believe I have found a way to circumvent this. Instead of redirecting the user back to the application, I redirect them to a small script which then redirects back to the page tab. Since the app has already been authorized, everything works and the signed_request gets passed along with the user infos. I don't know if it's really the legit way to go but it works.
Please set redirect variable to your the targeted page :
$redirect = "http://foo.com";
Set redirect_uri to "http[s]://apps.facebook.com/YOUR_APP/" instead of "http[s]://apps.facebook.com/YOUR_APP". Note the trailing slash!
I have figured out that using javascript sdk is much better choice when unsolved redirect issues arise using server scripts, implement this small test and you will figure out that most things happen using lightbox i.e. above your app. which keeps the app page intact.
https://developers.facebook.com/docs/facebook-login/getting-started-web/