Facebook retrieve correct acess_tokens - php

Question

I am having trouble finding the right access_tokens.
I have tried all ways that I have found on Google and developers.fb, but for this application(I have done it before, and made it work for another app) I just don't seem to be succesful.
I am aware that FB is constantly renewing their API's so maybe I just have found outdated solutions.
There seem to be different types of access tokens: user access tokens, and page access tokens. I find some answers in facebook documentation, but none that I understand.
The app I'm trying to create is something similar to a birthday-reminder, so it needs to be able to send offline messages(fex. be runned by a cron-job, and post to just one fb-page, owned by me, just in the name of the app itself)
I have registered the app with the page-tab on this address:
--https://www.facebook.com/dialog/pagetab?app_id=MY_APP'S_ID&display=popup&next=MY_URL--
and can now find it from the Facebook-page's settings.
Then I get to the part where i need the access token.
I dont know which of the URL's that give me what kind of access token, so I have tried both:
I have visited this URL:
(I write all links duplicate, the answer from tutorials, and my re-written link)
(of course all code pointing to my app and webpage is replaced for security reasons)
--https://www.facebook.com/dialog/oauth?client_id=0123456789011121&redirect_uri=http://www.example.com&scope=read_stream,publish_stream,offline_access--
--https://www.facebook.com/dialog/oauth?client_id=MY_APP_ID&redirect_uri=MY_REDIRECT_URL&scope=read_stream,publish_stream,offline_access--
and got:
http://www.example.com/?code=XXXXX1x1X1xxXxxX1xXxXxX1X111xX11XXXXX1XXXXXxX_XxXxxXxX1xxxXx1xXxXx-x1XxXXXxXXx1xXxXXXxXl1xX-111xXxxxXxxx1xXxxx1xXx1X1X1Xx-xxxXXXxXXXX1XXXXxx1Xxx1_xXxXxxxXx1x1XxXxxXx1XXxX-x1x1xxxXXxXxX1XX1XX1x1-xxXxxxx1Xx1XxXXXxxX#_=_
in other words(as I believe), retrieved the code:
XXXXX1x1X1xxXxxX1xXxXxX1X111xX11XXXXX1XXXXXxX_XxXxxXxX1xxxXx1xXxXx-x1XxXXXxXXx1xXxXXXxXl1xX-111xXxxxXxxx1xXxxx1xXx1X1X1Xx-xxxXXXxXXXX1XXXXxx1Xxx1_xXxXxxxXx1x1XxXxxXx1XXxX-x1x1xxxXXxXxX1XX1XX1x1-xxXxxxx1Xx1XxXXXxxX#_=_
As I have found on Google, it seems as I need to get another code as well, so then I have visited this URL(of course I have tried the first code I got first):
https://graph.facebook.com/oauth/access_token?client_id=0123456789011121&redirect_uri=http://www.example.com&client_secret=1x1111xx11111xXXx11x111111111x11&code=XXXXX1x1X1xxXxxX1xXxXxX1X111xX11XXXXX1XXXXXxX_XxXxxXxX1xxxXx1xXxXx-x1XxXXXxXXx1xXxXXXxXl1xX-111xXxxxXxxx1xXxxx1xXx1X1X1Xx-xxxXXXxXXXX1XXXXxx1Xxx1_xXxXxxxXx1x1XxXxxXx1XXxX-x1x1xxxXXxXxX1XX1XX1x1-xxXxxxx1Xx1XxXXXxxX#_=_
--https://graph.facebook.com/oauth/access_token?client_id=MY_APP_ID&redirect_uri=MY_REDIRECT_URL&client_secret=MY_APP_SECRET&code=THE_CODE_I_GOT_FROM_THE_PREVIOUS_RUN--
But when i try to run the app I get this error message:
Result: {"error":{"message":"Malformed access token XXXXX1x1X1xxXxxX1xXxXxX1X111xX11XXXXX1XXXXXxX_XxXxxXxX1xxxXx1xXxXx-x1XxXXXxXXx1xXxXXXxXl1xX-111xXxxxXxxx1xXxxx1xXx1X1X1Xx-xxxXXXxXXXX1XXXXxx1Xxx1_xXxXxxxXx1x1XxXxxXx1XXxX-x1x1xxxXXxXxX1XX1XX1x1-xxXxxxx1Xx1XxXXXxxX#_=_","type":"OAuthException","code":190}}
I have tried with different types of the ending of the access token(#=), because I dont recognize it from the other, working access token I retrieved last week, to a fully working app that I have built. That one did not have that ending, as I remember.
I also post the script here, if that is of any interest. I have found it in a tutorial, and it is quite simple code:
<?php
// CURL function to send with post method
function send_post_curl($url, $postdata = “”) {
$ch = curl_init($url);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
$data = curl_exec ($ch);
curl_close ($ch);
return $data;
}
// setup the message
$fburl = 'https://graph.facebook.com/THE_FB_PAGE_ID/feed';
$fbtoken = 'THE_ACCESS_TOKEN';
$fbmsg = 'Great API to auto status, this is the message.
Thank to WebDDR
http://webddr.net/tips-and-tricks/facebook-offline-access-step-by-step-explanation/';
$fbpcurl = 'access_token='. $fbtoken;
$fbpcurl .= '&message='. str_replace('&', 'and', urlencode($fbmsg)) ;
$result = send_post_curl($fburl, $fbpcurl);
echo 'Result: '. $result;
?>
I really hope someone can help me, I am doing this as an job I have choosen to do for my education at the university.
/Johan
PS.
Sorry, had to wrangle with the links, --link-- because the forum thought it was spam
Ds.

Answer 1

Try this code :
<?php
session_start();
$facebook_appid = "facebook_appid"; // Facebook appplication id
$facebook_secret = "facebook_secret"; // Facebook secret id
$redirect_uri = "https://localhost/facebook_page/events.php"; // return url to our application after facebook login ## should be SAME as in facebook application
$scope = "user_photos,email,user_birthday,user_online_presence,offline_access,manage_pages,publish_stream,user_events,friends_events"; // User permission for facebook
$code = $_REQUEST["code"]?$_REQUEST["code"]:"";
if(empty($code)) {
$_SESSION['state'] = time(); // CSRF protection
$dialog_url = "https://www.facebook.com/dialog/oauth?client_id=". $facebook_appid . "&redirect_uri=" . urlencode($redirect_uri) . "&state=". $_SESSION['state'] . "&scope=".$scope;
header("location:".$dialog_url);
}
if($_SESSION['state'] && ($_SESSION['state'] == $_REQUEST['state'])) {
$token_url = "https://graph.facebook.com/oauth/access_token?". "client_id=" . $facebook_appid . "&redirect_uri=" . urlencode($redirect_uri). "&client_secret=" . $facebook_secret . "&code=" . $code;
$response = #file_get_contents($token_url);
$params = null;
parse_str($response, $params);
echo $params['access_token'];
echo "<br>";
//$offer_url = "https://graph.facebook.com/".$dt->id."/conversations?access_token=".$dt->access_token;
//$off = #file_get_contents($offer_url);
//$dto = json_decode($off);
//echo "<pre>";
//print_r($dto);
}
?>