UserEmailDomain.php
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UserEmailDomain.php
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	<?php

	namespace App\Rules;

	use Illuminate\Contracts\Validation\Rule;
	use Illuminate\Support\Facades\Validator;
	use Illuminate\Support\Str;

	class UserEmailDomain implements Rule
	{
	private $message;
	private $domains;

	/**
	* Class constructor.
	*
	* @param array\|null $domains Allowed domains
	*/
	public function __construct($domains = null)
	{
	$this->domains = $domains;
	}

	/**
	* Determine if the validation rule passes.
	*
	* Validation of local part of an email address that's
	* going to be user's login.
	*
	* @param string $attribute Attribute name
	* @param mixed $domain Domain part of email address
	*
	* @return bool
	*/
	public function passes($attribute, $domain): bool
	{
	// don't allow @localhost and other no-fqdn
	if (empty($domain) \|\| strpos($domain, '.') === false \|\| stripos($domain, 'www.') === 0) {
	$this->message = \trans('validation.domaininvalid');
	return false;
	}

	$domain = Str::lower($domain);

	// Use email validator to validate the domain part
	$v = Validator::make(['email' => 'user@' . $domain], ['email' => 'required\|email']);
	if ($v->fails()) {
	$this->message = \trans('validation.domaininvalid');
	return false;
	}

	// Check if specified domain is allowed for signup
	if (is_array($this->domains) && !in_array($domain, $this->domains)) {
	$this->message = \trans('validation.domaininvalid');
	return false;
	}

	return true;
	}

	/**
	* Get the validation error message.
	*
	* @return string
	*/
	public function message(): ?string
	{
	return $this->message;
	}
	}