Change password using custom controller - FOSUserBundle (without FormBuilder) - symfony

Question

I am implementing my own profile settings page. This will allow the user to change their name, email, password etc.
I understand FOSUserBundle has prebuilt /profile/edit and /profile/change-password. I would like to use the same functionality here except in my own twig bundles. I am not using FormBuilder.
This is my controller for changing user settings.
public function applySettings(Request $request)
{
$user = $this->getUser();
$dm = $this->get('doctrine_mongodb')->getManager();
$repository = $dm->getRepository('AppBundle:User');
$name = $request->get('_username');
$email = $request->get('_email');
$password = $request->get('_password');
$confirm = $request->get('_confirm');
if ($name != null) {
if ($name == ($repository->findOneBy(array('username' => $name )))) {
throw $this->createNotFoundException('Username already in use');
} else {
// username changed
$user->setUsername($name);
}
}
if ($email != null) {
if ($email == ($repository->findOneBy(array('email' => $email )))) {
throw $this->createNotFoundException('Email already in use');
} else {
// email changed
$user->setEmail($email);
}
}
if (strcmp($password, $confirm) == 0) {
// password = confirm here
// change password functionality done here
} else {
throw $this->createNotFoundException(
'Passwords do not match '
);
}
$dm->flush();
return $this->redirectToRoute('settings');
}
Is there a way I can do password validation in my own controller, salt and store the password if valid?
Also is there a way to apply the same validation methods that exist in /register/ and /profile/change-password where the alert comes up if the passwords do not match before submitting?
Any help would be greatly appreciated.
I am using Symfony 2.6.1 and the latest version of FOSUserBundle.

Answer 1

This is the function I used. Works but doesn't do the live validation check.
if (strcmp($password, $confirm) == 0) {
$encoder_service = $this->get('security.encoder_factory');
$encoder = $encoder_service->getEncoder($user);
$newpass = $encoder->encodePassword($password, $user->getSalt());
$user->setPassword($newpass);
} else {
throw $this->createNotFoundException(
'Passwords do not match '
);
}