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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\Extension\Core\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FileUploadError;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Contracts\Translation\TranslatorInterface;
class FileType extends AbstractType
{
public const KIB_BYTES = 1024;
public const MIB_BYTES = 1048576;
private const SUFFIXES = [
1 => 'bytes',
self::KIB_BYTES => 'KiB',
self::MIB_BYTES => 'MiB',
];
private $translator;
public function __construct(?TranslatorInterface $translator = null)
{
$this->translator = $translator;
}
/**
* {@inheritdoc}
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
// Ensure that submitted data is always an uploaded file or an array of some
$builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) use ($options) {
$form = $event->getForm();
$requestHandler = $form->getConfig()->getRequestHandler();
if ($options['multiple']) {
$data = [];
$files = $event->getData();
if (!\is_array($files)) {
$files = [];
}
foreach ($files as $file) {
if ($requestHandler->isFileUpload($file)) {
$data[] = $file;
if (method_exists($requestHandler, 'getUploadFileError') && null !== $errorCode = $requestHandler->getUploadFileError($file)) {
$form->addError($this->getFileUploadError($errorCode));
}
}
}
// Since the array is never considered empty in the view data format
// on submission, we need to evaluate the configured empty data here
if ([] === $data) {
$emptyData = $form->getConfig()->getEmptyData();
$data = $emptyData instanceof \Closure ? $emptyData($form, $data) : $emptyData;
}
$event->setData($data);
} elseif ($requestHandler->isFileUpload($event->getData()) && method_exists($requestHandler, 'getUploadFileError') && null !== $errorCode = $requestHandler->getUploadFileError($event->getData())) {
$form->addError($this->getFileUploadError($errorCode));
} elseif (!$requestHandler->isFileUpload($event->getData())) {
$event->setData(null);
}
});
}
/**
* {@inheritdoc}
*/
public function buildView(FormView $view, FormInterface $form, array $options)
{
if ($options['multiple']) {
$view->vars['full_name'] .= '[]';
$view->vars['attr']['multiple'] = 'multiple';
}
$view->vars = array_replace($view->vars, [
'type' => 'file',
'value' => '',
]);
}
/**
* {@inheritdoc}
*/
public function finishView(FormView $view, FormInterface $form, array $options)
{
$view->vars['multipart'] = true;
}
/**
* {@inheritdoc}
*/
public function configureOptions(OptionsResolver $resolver)
{
$dataClass = null;
if (class_exists(\Symfony\Component\HttpFoundation\File\File::class)) {
$dataClass = function (Options $options) {
return $options['multiple'] ? null : 'Symfony\Component\HttpFoundation\File\File';
};
}
$emptyData = function (Options $options) {
return $options['multiple'] ? [] : null;
};
$resolver->setDefaults([
'compound' => false,
'data_class' => $dataClass,
'empty_data' => $emptyData,
'multiple' => false,
'allow_file_upload' => true,
'invalid_message' => function (Options $options, $previousValue) {
return ($options['legacy_error_messages'] ?? true)
? $previousValue
: 'Please select a valid file.';
},
]);
}
/**
* {@inheritdoc}
*/
public function getBlockPrefix()
{
return 'file';
}
private function getFileUploadError(int $errorCode)
{
$messageParameters = [];
if (\UPLOAD_ERR_INI_SIZE === $errorCode) {
[$limitAsString, $suffix] = $this->factorizeSizes(0, self::getMaxFilesize());
$messageTemplate = 'The file is too large. Allowed maximum size is {{ limit }} {{ suffix }}.';
$messageParameters = [
'{{ limit }}' => $limitAsString,
'{{ suffix }}' => $suffix,
];
} elseif (\UPLOAD_ERR_FORM_SIZE === $errorCode) {
$messageTemplate = 'The file is too large.';
} else {
$messageTemplate = 'The file could not be uploaded.';
}
if (null !== $this->translator) {
$message = $this->translator->trans($messageTemplate, $messageParameters, 'validators');
} else {
$message = strtr($messageTemplate, $messageParameters);
}
return new FileUploadError($message, $messageTemplate, $messageParameters);
}
/**
* Returns the maximum size of an uploaded file as configured in php.ini.
*
* This method should be kept in sync with Symfony\Component\HttpFoundation\File\UploadedFile::getMaxFilesize().
*
* @return int|float The maximum size of an uploaded file in bytes (returns float if size > PHP_INT_MAX)
*/
private static function getMaxFilesize()
{
$iniMax = strtolower(\ini_get('upload_max_filesize'));
if ('' === $iniMax) {
return \PHP_INT_MAX;
}
$max = ltrim($iniMax, '+');
if (str_starts_with($max, '0x')) {
$max = \intval($max, 16);
} elseif (str_starts_with($max, '0')) {
$max = \intval($max, 8);
} else {
$max = (int) $max;
}
switch (substr($iniMax, -1)) {
case 't': $max *= 1024;
// no break
case 'g': $max *= 1024;
// no break
case 'm': $max *= 1024;
// no break
case 'k': $max *= 1024;
}
return $max;
}
/**
* Converts the limit to the smallest possible number
* (i.e. try "MB", then "kB", then "bytes").
*
* This method should be kept in sync with Symfony\Component\Validator\Constraints\FileValidator::factorizeSizes().
*
* @param int|float $limit
*/
private function factorizeSizes(int $size, $limit)
{
$coef = self::MIB_BYTES;
$coefFactor = self::KIB_BYTES;
$limitAsString = (string) ($limit / $coef);
// Restrict the limit to 2 decimals (without rounding! we
// need the precise value)
while (self::moreDecimalsThan($limitAsString, 2)) {
$coef /= $coefFactor;
$limitAsString = (string) ($limit / $coef);
}
// Convert size to the same measure, but round to 2 decimals
$sizeAsString = (string) round($size / $coef, 2);
// If the size and limit produce the same string output
// (due to rounding), reduce the coefficient
while ($sizeAsString === $limitAsString) {
$coef /= $coefFactor;
$limitAsString = (string) ($limit / $coef);
$sizeAsString = (string) round($size / $coef, 2);
}
return [$limitAsString, self::SUFFIXES[$coef]];
}
/**
* This method should be kept in sync with Symfony\Component\Validator\Constraints\FileValidator::moreDecimalsThan().
*/
private static function moreDecimalsThan(string $double, int $numberOfDecimals): bool
{
return \strlen($double) > \strlen(round($double, $numberOfDecimals));
}
}