AllowedProtocols.php

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<?php
namespace Magento\Framework\Validator;

use \Zend\Uri\Uri;

class AllowedProtocols extends AbstractValidator
{
    private $listOfProtocols = [
        'http',
        'https',
    ];

    public function __construct($listOfProtocols = [])
    {
        if (count($listOfProtocols)) {
            $this->listOfProtocols = $listOfProtocols;
        }
    }

    public function isValid($value)
    {
        $uri = new Uri($value);
        $isValid = in_array(
            strtolower($uri->getScheme()),
            $this->listOfProtocols
        );
        if (!$isValid) {
            $this->_addMessages(["Protocol isn't allowed"]);
        }
        return $isValid;
    }
}