Undefined array key "contact" in Client.php:362 causes TypeError

[nintech-sudo]

Description:

I encountered a TypeError when using the Client::getAccount() method in Client.php (line 362). The error occurs when the contact key is missing or empty in the Let's Encrypt API response, causing null to be passed to Account::__construct(), which expects an array.

Steps to Reproduce:

Initialize Client with a configuration containing contact (e.g., ['mailto:admin@ultimas.io.vn']).
Call createOrder(), which triggers getAccount().
The error appears if the API response lacks the contact key.

Error Log:

PHP Warning: Undefined array key "contact" in .../Client.php on line 362
PHP Fatal error: Uncaught TypeError: Afosto\Acme\Data\Account::__construct(): Argument #1 ($contact) must be of type array, null given```

Cause:
The code assumes $data['contact'] exists without validation:
return new Account($data['contact'], $date, ($data['status'] == 'valid'), $accountURL);

Fix:
Modify getAccount() to use $this->config['contact'] as fallback:

{
    $response = $this->request(
        $this->getUrl(self::DIRECTORY_NEW_ACCOUNT),
        $this->signPayloadJWK(
            ['onlyReturnExisting' => true],
            $this->getUrl(self::DIRECTORY_NEW_ACCOUNT)
        )
    );
    $data = json_decode((string)$response->getBody(), true);
    $accountURL = $response->getHeaderLine('Location');
    $date = (new \DateTime())->setTimestamp(strtotime($data['createdAt']));
    $contact = isset($data['contact']) && is_array($data['contact']) ? $data['contact'] : $this->getOption('contact', ['mailto:' . $this->getOption('username')]);
    error_log("Contact before Account creation: " . json_encode($contact));
    return new Account($contact, $date, ($data['status'] == 'valid'), $accountURL);
}```

Request for Fix:

Please address this issue by adding a check for the existence of $data['contact'] in the getAccount() method. I suggest using $this->config['contact'] as a fallback if $data['contact'] is missing or not an array.

Thank you for your support!

[gpibarra]

#76