Posting to facebook page wall via curl

Question

I am trying to post to my facebook page wall using curl but i keep getting the following error

The user hasn't authorized the application to perform this action

How do i generate the correct access token using curl? if you go to this url http://developers.facebook.com/tools/explorer/

I can then put in the following https://graph.facebook.com/337588736279406/feed and this will show my wall feed i can then change this to post and add a field for the message content if i then run this i get the following response.

    {
  "error": {
    "message": "(#200) The user hasn't authorised the application to perform this action", 
    "type": "OAuthException", 
    "code": 200
  }
}

What do i have to do to authorize me as a user??

Can someone help me on this.

    <?php

function postify($arr) {
    $fields_string = '';
    foreach ($arr as $key => $value) {
        $fields_string .= $key . '=' . $value . '&';
    }
    return rtrim($fields_string, '&');
}


$appid = 'app id';
$redirect_url = 'http://stickynote.users36.interdns.co.uk';
$app_secret = 'app secret';
$page_id = '337588736279406';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id='.$appid.'&redirect_uri='.$redirect_url.'&client_secret='.$app_secret.'&perms=publish_stream');
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);

$output = explode("=", $output);

curl_close($ch);

$postdata = array(
    'message' => 'this is a test message',
);


$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://graph.facebook.com/'.$page_id.'/feed?access_token='.$output[1].'');
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, postify($postdata));
$check = curl_exec($ch);

print_r($check);        

?>

Answer 1

To be able to post content you must grant publish_stream permission to your application.

Requesting permissions can be done using OAuth Dialog .

BTW, If you just need it for user for testing purposes you may use Explorer Tool by choosing your application, clicking Get Access Token and checking needed permissions.

Update:
You will not be able to post on behalf of app, only user or page with appropriate access_token (for page it will require manage_pages and access_token from accounts connection of user ). No need to specify perms in access_token retrieval URL. Permissions should be granted before that step.

Answer 2

You need to get a page access token to do that.

In the documentation it says:

Page access_token

An access_token used to manage a page. This is used when you want to perform an operation acting as a Page. This access token is retrieved by issuing an HTTP GET to /USER_ID/accounts or to /PAGE_ID?fields=access_token with the manage_pages permission. Getting /USER_ID/accounts will return a list of Pages (including app profile pages) to which the user has administrative access in addition to an access_token for each Page. Alternatively, you can get a page access token for a single, specific, page by issuing an HTTP GET to /PAGE_ID?fields=access_token with the manage_pages permission (you must ask for the access_token field specifically via the fields= parameter). See the documentation for the Page object for more information

After you get the access token you can then make those api calls.