lbry.com/controller/action/AcquisitionActions.class.php

<?php

class AcquisitionActions extends Actions
{
    public static function executeThanks()
    {
        return ['acquisition/thanks'];
    }

    public static function executeYouTubeSub()
    {
        if (!Request::isPost()) {
            return Controller::redirect('/youtube');
        }

        $email = Request::getPostParam('email');

        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            Session::setFlash('error', 'Please enter a valid email.');
            return Controller::redirect('/youtube');
        }

        Salesforce::createContact($email, SalesForce::DEFAULT_LIST_ID, 'YouTube Campaign');
        Mailgun::sendYouTubeWarmLead(['email' => $email]);

        Session::setFlash('success', 'Thanks! We\'ll be in touch. The good kind of touch.');

        return Controller::redirect(Request::getReferrer(), 303);
    }

    public static function executeYouTube()
    {
        if (isset($_GET['error_message'])) {
            $error_message = Request::encodeStringFromUser($_GET['error_message']);
        }

        return ['acquisition/youtube', [
        'reward' => LBRY::youtubeReward(),
        'error_message' => $error_message ?? ''
    ]];
    }

    public static function executeVerify(string $token)
    {
        return ['acquisition/verify', ['token' => $token]];
    }

    public static function executeYoutubeToken()
    {
        return ['acquisition/youtube_token', ['_no_layout' => true]];
    }

    public static function executeYoutubeStatus(string $token)
    {
        if (isset($_GET['error_message'])) {
            $error_message = Request::encodeStringFromUser($_GET['error_message']);
        }

        $data = LBRY::statusYoutube($token);
        if ($data['success'] == false) {
            Controller::redirect('/youtube?error=true&error_message=' . $data['error']);
        }
        return ['acquisition/youtube_status', [
        'token' => $token,
        'status_token' => $data,
        'error_message' => $error_message ?? ''
    ]];
    }

    public static function actionYoutubeToken(string $desired_lbry_channel_name)
    {
        $desired_lbry_channel_name_is_valid = static::lbry_channel_verification($desired_lbry_channel_name);

        if ($desired_lbry_channel_name_is_valid) {
            $token = LBRY::connectYoutube($desired_lbry_channel_name);
            if ($token['success'] == false) {
                Controller::redirect('/youtube?error=true&error_message=' . $token['error']);
            } else {
                Controller::redirect($token['data']);
            }
        }
    }
    public static function actionYoutubeEdit($status_token, $channel_name, $email, $sync_consent)
    {
        $current_value = LBRY::statusYoutube($status_token);
        if ($current_value['data']['email'] == $email) {
            $status = LBRY::editYoutube($status_token, $channel_name, null, $sync_consent);
        } else {
            $status = LBRY::editYoutube($status_token, $channel_name, $email, $sync_consent);
        }

        if ($status['success'] == false) {
            Controller::redirect("/youtube/status/". $status_token . "?error=true&error_message=" . $status['error']);
        } else {
            Controller::redirect("/youtube/status/" . $status_token);
        }
    }
    public static function executeYoutubeEdit()
    {
        return ['acquisition/youtube_edit'];
    }

    public static function executeRedirectYoutube()
    {
        return ['acquisition/youtube_status_redirect'];
    }

    protected static function email_verification($email)
    {
        if (preg_match('/\S+@\S+\.\S+/', $email)) {
            return true;
        } else {
            return false;
        }
    }

    protected static function youtube_channel_verification($youtube_channel_id)
    {
        if (preg_match('/^UC[A-Za-z0-9_-]{22}$/', $youtube_channel_id)) {
            return true;
        } else {
            return false;
        }
    }

    protected static function lbry_channel_verification($lbry_channel)
    {
        if (preg_match('/[1-z]+/', $lbry_channel)) {
            return true;
        } else {
            return false;
        }
    }
}