static function Facebook_login()
{
header('Content-type: text/plain');
try {
// Check token
$url = 'https://graph.facebook.com/v2.2/' . $_REQUEST['uid'];
$url = apply_filters('al2fb_url', $url);
$query = http_build_query(array('access_token' => $_REQUEST['token']), '', '&');
$response = WPAL2Int::Request($url, $query, 'GET');
$me = json_decode($response);
// Workaround if no e-mail present
if (!empty($me) && empty($me->email)) {
$users = get_users(array('meta_key' => c_al2fb_meta_facebook_id, 'meta_value' => $me->id));
if (count($users) == 0) {
$regurl = get_user_meta($_REQUEST['user'], c_al2fb_meta_login_regurl, true);
if (!empty($regurl)) {
wp_redirect($regurl);
}
} else {
if (count($users) == 1) {
$me->email = $users[0]->user_email;
}
}
}
// Check Facebook user
if (!empty($me) && !empty($me->id)) {
// Find user by Facebook ID
$users = get_users(array('meta_key' => c_al2fb_meta_facebook_id, 'meta_value' => $me->id));
// Check if found one
if (count($users) == 1) {
// Try to login
$user = WPAL2Int::Login_by_email($users[0]->user_email, true);
// Check login
if ($user) {
// Persist token
update_user_meta($user->ID, c_al2fb_meta_facebook_token, $_REQUEST['token']);
update_user_meta($user->ID, c_al2fb_meta_facebook_token_time, time());
// Redirect
$self = (is_ssl() ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . $_REQUEST['uri'];
$redir = get_user_meta($_REQUEST['user'], c_al2fb_meta_login_redir, true);
wp_redirect($redir ? $redir : $self);
} else {
// User not found (anymore)
header('Content-type: text/plain');
_e('User not found', c_al2fb_text_domain);
echo PHP_EOL;
if (get_option(c_al2fb_option_debug)) {
print_r($me);
}
}
} else {
$self = (is_ssl() ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . $_REQUEST['uri'];
$regurl = get_user_meta($_REQUEST['user'], c_al2fb_meta_login_regurl, true);
wp_redirect($regurl ? $regurl : $self);
}
} else {
// Something went wrong
header('Content-type: text/plain');
_e('Could not verify Facebook login', c_al2fb_text_domain);
echo PHP_EOL;
if (get_option(c_al2fb_option_debug)) {
print_r($_REQUEST);
print_r($response);
}
}
} catch (Exception $e) {
// Communication error?
header('Content-type: text/plain');
_e('Could not verify Facebook login', c_al2fb_text_domain);
echo PHP_EOL;
echo $e->getMessage();
echo PHP_EOL;
}
}
