fb-callback.php corrections to split first name and last name, also replace token->generate() with new uuid function

README.txt

replace fb-callback.php, we have split the first and last names so they register in database seperately, 
changed password generation slightly to use random uuid as part of phase out of old Token::generate(); 

TODO: Shouldnt we realy force the user to set a password on first login ? Shouldnt we require user to verify email aswell? 
maybe we could do both in one email? user registers via fb -> receives verify email with link to create new password -> user creates password which verifys account

add the above generate_uuid4() function to us_helpers. 
which incidently can be used in admin_backup.php to name the zips like: b6b42970-a25d-4bf8-b782-92fc3b5e7338

fb-callback.php

<?php
require_once 'init.php';

$db=DB::getInstance();

$settingsQ=$db->query("SELECT * FROM settings");
$settings=$settingsQ->first();

if(!isset($_SESSION)){session_start();}

$appID=$settings->fbid;
$secret=$settings->fbsecret;
$version=$settings->graph_ver;
$whereNext=$settings->finalredir;

require_once("src/Facebook/autoload.php");
$fb = new Facebook\Facebook([
  'app_id' => $appID, // Replace {app-id} with your app id
  'app_secret' => $secret,
  'default_graph_version' => $version,
  ]);

$helper = $fb->getRedirectLoginHelper();

try {
  $accessToken = $helper->getAccessToken();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  // When Graph returns an error
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  // When validation fails or other local issues
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}

if (! isset($accessToken)) {
  if ($helper->getError()) {
    header('HTTP/1.0 401 Unauthorized');
    echo "Error: " . $helper->getError() . "\n";
    echo "Error Code: " . $helper->getErrorCode() . "\n";
    echo "Error Reason: " . $helper->getErrorReason() . "\n";
    echo "Error Description: " . $helper->getErrorDescription() . "\n";
  } else {
    header('HTTP/1.0 400 Bad Request');
    echo 'Bad request';
  }
  exit;
}

// Logged in
//echo '<h3>Access Token</h3>';
//var_dump($accessToken->getValue());

// The OAuth 2.0 client handler helps us manage access tokens
$oAuth2Client = $fb->getOAuth2Client();

// Get the access token metadata from /debug_token
$tokenMetadata = $oAuth2Client->debugToken($accessToken);
//echo '<h3>Metadata</h3>';
//var_dump($tokenMetadata);

// Validation (these will throw FacebookSDKException's when they fail)
$tokenMetadata->validateAppId($appID); // Replace {app-id} with your app id
// If you know the user ID this access token belongs to, you can validate it here
//$tokenMetadata->validateUserId('123');
$tokenMetadata->validateExpiration();

if (! $accessToken->isLongLived()) {
  // Exchanges a short-lived access token for a long-lived one
  try {
    $accessToken = $oAuth2Client->getLongLivedAccessToken($accessToken);
  } catch (Facebook\Exceptions\FacebookSDKException $e) {
    echo "<p>Error getting long-lived access token: " . $helper->getMessage() . "</p>\n\n";
    exit;
  }

  echo '<h3>Long-lived</h3>';
  var_dump($accessToken->getValue());
}

$_SESSION['fb_access_token'] = (string) $accessToken;

// User is logged in with a long-lived access token.
// You can redirect them to a members-only page.
//header('Location: https://example.com/members.php');
try {
  // Returns a `Facebook\FacebookResponse` object
  $response = $fb->get('/me?fields=id,name,email', $_SESSION['fb_access_token']);
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}

$fbuser = $response->getGraphUser();

//In case you want to test what you get back from FriendFace
// var_dump($user);
// echo 'Name: ' . $fbuser['name'];
// echo '<br>email: ' . $fbuser['email'];
// echo '<br>id: ' . $fbuser['id'];

//Facebook Authenticated - Let's do something with that info

//Check to see if the user has an account
$fbEmail = $fbuser['email'];


$checkExistingQ = $db->query("SELECT * FROM users WHERE email = ?",array ($fbEmail));

$CEQCount = $checkExistingQ->count();

//Existing Terminus User Found
if ($CEQCount>0){
$checkExisting = $checkExistingQ->first();
$newLoginCount = $checkExisting->logins+1;
$newLastLogin = date("Y-m-d H:i:s");

$fields=array('fb_uid'=>$fbuser['id'], 'logins'=>$newLoginCount, 'last_login'=>$newLastLogin);

$db->update('users',$checkExisting->id,$fields);
$_SESSION["user"] = $checkExisting->id;

Redirect::to('account.php');
}else{
	
// :: DONE: Replace Token::generate(); with generate_uuid4()

// //No Existing User Found
// if ($CEQCount<0){
$fbpassword = password_hash(generate_uuid4(),PASSWORD_BCRYPT,array('cost' => 12));
$date = date("Y-m-d H:i:s");

$fbname = $fbuser['name'];
$parts = explode(' ', $fbname);

$firstname = parts[0];
echo trim($firstname); 

$lastname = parts[1];
echo trim($lastname);

list($firstname, $lastname) = explode(' ', $fbname);

$fields=array('email'=>$fbEmail,'username'=>$fbEmail,'fname'=>trim($firstname),'lname'=>trim($lastname),'permissions'=>1,'logins'=>1,'company'=>'','join_date'=>$date,'last_login'=>$date,'email_verified'=>1,'password'=>$fbpassword,'fb_uid'=>$fbuser['id']);

$db->insert('users',$fields);
$lastID = $db->lastId();

$insert2 = $db->query("INSERT INTO user_permission_matches SET user_id = $lastID, permission_id = 1");
$insert3 = $db->query("INSERT INTO profiles SET user_id = $lastID, bio = 'This is your bio'");

$_SESSION["user"] = $lastID;
Redirect::to($whereNext);
}
?>

us_helpers.php

//:: Generate a random UUID (version 4).
//:: Use for file nameing inc. admin_backup
function generate_uuid4() {
	return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
		mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
		mt_rand( 0, 0xffff ),
		mt_rand( 0, 0x0fff ) | 0x4000,
		mt_rand( 0, 0x3fff ) | 0x8000,
		mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
	);
}