I need to develop application that automatically posts updates to its facebook page. So I logged into facebook.com and created app and page. I used this tutorial to obtain page access token:
http://aseriesoftubes.com/articles/obtaining-facebook-page-access-tokens-the-4-step-program/
To implement the process described in tutorial I've created 2 files, one.php:
<?php
require_once dirname(__FILE__)."/../lib/conf.php";
if (!( isset($_SESSION['user']) && $_SESSION['user']['email'] == ADMIN_EMAIL )) {
header("Location: {$www_base}/user/login.php");
exit;
}
header(
"Location: https://www.facebook.com/dialog/oauth".
"?client_id=".urlencode($facebookConf['app_id']).
"&redirect_uri=".urlencode("{$www_base}/facebook/two.php").
"&scope=manage_pages%2Cpublish_stream".
"&state=state"
);
exit;
and two.php:
<?php
require_once dirname(__FILE__)."/../lib/conf.php";
if (!( isset($_SESSION['user']) && $_SESSION['user']['email'] == ADMIN_EMAIL )) {
header("Location: {$www_base}/user/login.php");
exit;
}
if (!( isset($_GET['code']) && is_string($_GET['code']) && $_GET['code'] != "" )) {
header("Location: {$www_base}/facebook/one.php");
exit;
}
require_once dirname(__FILE__)."/../lib/Curl.php";
$ch = new Curl();
$resp = $ch->get(
"https://graph.facebook.com/oauth/access_token".
"?client_id=".urlencode($facebookConf['app_id']).
"&client_secret=".urlencode($facebookConf['app_secret']).
"&code=".urlencode($_GET['code']).
"&redirect_uri=".urlencode("{$www_base}/facebook/two.php")
);
if (!preg_match('#access_token=([^&]+)#Duis', $resp, $m)) exit("Wrong response while trying to receive access_token: |{$resp}|");
$access_token = $m[1];
$resp = $ch->get(
"https://graph.facebook.com/oauth/access_token".
"?grant_type=fb_exchange_token".
"&client_id=".urlencode($facebookConf['app_id']).
"&client_secret=".urlencode($facebookConf['app_secret']).
"&fb_exchange_token=".urlencode($access_token)
);
if (!preg_match('#access_token=([^&]+)#Duis', $resp, $m)) exit("Wrong response while trying to receive long lived access_token: |{$resp}|");
$access_token = $m[1];
$resp = $ch->get("https://graph.facebook.com/me/accounts?access_token=".urlencode($access_token));
$json = json_decode($resp, true);
if (is_null($json)) exit("JSON error: |{$resp}|");
$pageToken = "";
foreach ($json['data'] as $page) {
if ($page['id'] == $facebookConf['page_id']) {
$pageToken = $page['access_token'];
}
}
?>
<b>Your new page token is: </b>
<hr />
<textarea style="width: 90%;" rows="7"><?php h($pageToken); ?></textarea>
<hr />
<b>Please copy and paste it into 'lib/settings.php' -> $facebookConf -> 'page_token' so the line looks like this:<br /></b>
<textarea style="width: 90%;" rows="7">'page_token' => "<?php h($pageToken); ?>",</textarea>
<hr />
<pre><?php print_r($json); ?></pre>
So, from one.php browser redirects to facebook.com and facebook redirects it back to two.php. The code in two.php obtains the page access token and displays it for admin to insert into config file. This is the JSON array I received in two.php:
Array
(
[data] => Array
(
[0] => Array
(
[category] => Community
[name] => aliexpresspricewatcher.com
[access_token] => CAAKVUVmML7kBABbh5Adgp4AqnpJfakZB4rWr8DQjyLxIrZANgH6sAJv87RLPMwpn1sI3btu46kgaUQNZBGhvgyAUZCdm0TRcWQZBi2wUN034kbnEZCmzKCZCLGsUbGiTYCgilZC4X8EoClLw1cw8SUgg2R3iJjKwKM623RZCRVdYVXZBKHvpf1Nc9XJQLX2fISYUMZD
[perms] => Array
(
[0] => ADMINISTER
[1] => EDIT_PROFILE
[2] => CREATE_CONTENT
[3] => MODERATE_CONTENT
[4] => CREATE_ADS
[5] => BASIC_ADMIN
)
[id] => 381473385336541
)
)
[paging] => Array
(
[next] => https://graph.facebook.com/v2.1/712868945455685/accounts?access_token=CAAKVUVmML7kBAEKWirBfCdP2VP0YVrhwGpbfDJ0ofLJ8s6RBdNxwY3UsFNN28NeAVrKPan21ZALfmgIqNAXKfsZAHqZArtZBDPrjfJp5mBBUZC0pf2KX6Yy0PL2kl5OIBOj0pKgXv9xzGpZCRERc8CtSeeUYaghkczDchQ14qU3PdzkWq22zi4&limit=1000&offset=1000&__after_id=enc_Aew6akARByTD9c1srd6xeb7_4aXnG9RGCU1VOF9V_ALfh9kDbiEHA0sZhMBBEcrnFtJlr7vPJeKWTu7mENZgDxTK
)
)
So, I copied access token to my conf.php file and created test.php to test it:
<?php
require_once dirname(__FILE__)."/../lib/conf.php";
if (!( isset($_SESSION['user']) && $_SESSION['user']['email'] == ADMIN_EMAIL )) {
header("Location: {$www_base}/user/login.php");
exit;
}
require_once dirname(__FILE__)."/../lib/Curl.php";
$ch = new Curl();
$resp = $ch->post(
"https://graph.facebook.com/v2.1/{$facebookConf['page_id']}/feed",
"message=This+is+a+test+message"
);
echo "|{$resp}|";
But it shows an error:
|{ "error": { "message": "(#200) Permissions error", "type": "OAuthException", "code": 200 } }|
What did I do wrong? Please advice, it's very hard to find complete information in facebook documentation, worst documentation I've ever seen. The project is almost finished and this is the only feature I have no idea how to fix because I have no previous experience with facebook.
