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<?php
namespace WPForms\Forms\Fields\Traits;
/**
* File methods trait.
*
* @since 1.9.8
*/
trait FileMethodsTrait {
/**
* File extensions that are not allowed.
*
* @since 1.9.8
*
* @var array
*/
private $denylist = [
'ade',
'adp',
'app',
'asp',
'bas',
'bat',
'cer',
'cgi',
'chm',
'cmd',
'com',
'cpl',
'crt',
'csh',
'csr',
'dll',
'drv',
'exe',
'fxp',
'flv',
'hlp',
'hta',
'htaccess',
'htm',
'html',
'htpasswd',
'inf',
'ins',
'isp',
'jar',
'js',
'jse',
'jsp',
'ksh',
'lnk',
'mdb',
'mde',
'mdt',
'mdw',
'msc',
'msi',
'msp',
'mst',
'ops',
'pcd',
'php',
'pif',
'pl',
'prg',
'ps1',
'ps2',
'py',
'rb',
'reg',
'scr',
'sct',
'sh',
'shb',
'shs',
'sys',
'swf',
'tmp',
'torrent',
'url',
'vb',
'vbe',
'vbs',
'vbscript',
'wsc',
'wsf',
'wsf',
'wsh',
'dfxp',
'onetmp',
];
/**
* Get all allowed extensions.
* Check against user-entered extensions.
*
* @since 1.9.8
*
* @return array
*/
protected function get_extensions(): array {
// Allowed file extensions by default.
$default_extensions = $this->get_default_extensions();
// Allowed file extensions.
$extensions = ! empty( $this->field_data['extensions'] ) ? explode( ',', $this->field_data['extensions'] ) : $default_extensions;
return wpforms_chain( $extensions )
->map(
static function ( $ext ) {
return strtolower( preg_replace( '/[^A-Za-z0-9_-]/', '', $ext ) );
}
)
->array_filter()
->array_intersect( $default_extensions )
->value();
}
/**
* Determine the max-allowed file size in bytes as per field options.
*
* @since 1.9.8
*
* @return int Number of bytes allowed.
*/
public function max_file_size(): int {
if ( ! empty( $this->field_data['max_size'] ) ) {
// Strip any suffix provided (e.g., M, MB, etc.), which leaves us with the raw MB value.
$max_size = preg_replace( '/[^0-9.]/', '', $this->field_data['max_size'] );
return wpforms_size_to_bytes( $max_size . 'M' );
}
return (int) wpforms_max_upload( true );
}
/**
* Get default extensions supported by WordPress
* without those that we manually denylist.
*
* @since 1.9.8
*
* @return array
*/
protected function get_default_extensions(): array {
return wpforms_chain( get_allowed_mime_types() )
->array_keys()
->implode( '|' )
->explode( '|' )
->array_diff( $this->denylist )
->value();
}
}