[Mime] FormDataPart missing root name while processing multidimensional array of fields #33063
Description
Symfony 4.3
We miss name of the TextPart attachments while preparing multidimensional arrays inside FormDataPart.
To reproduce it just send multiple attachments with custom name with FormDataPart.
For example, I took code from symfony/mailer-mailgun:
$body = new FormDataPart($this->getPayload($email, $envelope));
...
private function getPayload(Email $email, SmtpEnvelope $envelope): array
{
...
$payload = [
'from' => $envelope->getSender()->toString(),
'to' => implode(',', $this->stringifyAddresses($this->getRecipients($email, $envelope))),
'subject' => $email->getSubject(),
/** i'm talking about these 2 params */
'attachment' => $attachments,
'inline' => $inlines,
];
...
}
As a result the request attachments will be without name (or with indexed as 0,1,2.. names).
It happens, because we miss parent key name in FormDataPart::prepareFields method.
private function prepareFields(array $fields): array
{
$values = [];
array_walk_recursive($fields, function ($item, $key) use (&$values) {
if (!\is_array($item)) {
$values[] = $this->preparePart($key, $item);
}
});
return $values;
}