How to create a custom youtube url form validator - php

Question

I want to create a custom form validator to check if my user is sending a youtube url.
I've already created my lib/validator/youtubeValidator.class.php
Then I use it in my MyForm.class.php : new YoutubeValidator(........)
Here is the code :
class YoutubeValidator extends sfValidatorUrl
{
protected function configure($options = array(), $messages = array())
{
$this->addMessage('invalid', 'Veuillez entrer un lien Youtube');
}
protected function doClean($url)
{
$pattern =
'%^# Match any youtube URL
(?:https?://)? # Optional scheme. Either http or https
(?:www\.)? # Optional www subdomain
(?: # Group host alternatives
youtu\.be/ # Either youtu.be,
| youtube\.com # or youtube.com
(?: # Group path alternatives
/embed/ # Either /embed/
| /v/ # or /v/
| /watch\?v= # or /watch\?v=
) # End path alternatives.
) # End host alternatives.
([\w-]{10,12}) # Allow 10-12 for 11 char youtube id.
$%x'
;
$result = preg_match($pattern, $url, $matches);
if (false !== $result)
{
return $matches[1];
}
return false;
if (false !== $result)
{
throw new sfValidatorError($this, 'invalid', array('value' => $value));
}
else
{
return true;
}
}
}
But it does not work at all.
Moreover, it could be great if my validator could check if youtube video does exist.

Answer 1

You probably need to change the last lines to something like this:
$result = preg_match($pattern, $url, $matches);
if (false === $result)
{
throw new sfValidatorError($this, 'invalid', array('value' => $url));
}
return $url;
This will only check if the url submitted by user is a youtube url (if it matches your regular expression). If no, will throw an exception.
UPDATE
-- deleted--
UPDATE 2
class YoutubeValidator extends sfValidatorUrl
{
protected function configure($options = array(), $messages = array())
{
parent::configure($options, $messages);
$this->setMessage('invalid', 'Veuillez entrer un lien Youtube');
}
protected function doClean($value)
{
$pattern = "/(http(s)?:\/\/)?(?:youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=)([^#\&\?]*).*/";
preg_match($pattern, $value, $matches);
if (empty($matches[3]))
{
throw new sfValidatorError($this, 'invalid', array('value' => $value));
}
return $matches[3];
}
}
I've tested it and seems to be working ok (returning the actual video id when using $form->getValues()).