get attached file name

Hi all, I am using the picture field in contacts to store an avatar image for my contacts. I want to be able to dowload this page via the api so I can store it on a website that the contacts use. i read the following page

https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_9.2/Cookbook/Web_Services/REST_API/PHP/… 

and the code 

//Get An Attachment on a Note
$url = $instance_url . "/Notes/{$noteRecord->id}/file/filename";

$curl_request = curl_init($url);
curl_setopt($curl_request, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
//Return Headers
curl_setopt($curl_request, CURLOPT_HEADER, true);
curl_setopt($curl_request, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl_request, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl_request, CURLOPT_FOLLOWLOCATION, 0);
//DO NOT set Content Type Header to JSON
curl_setopt($curl_request, CURLOPT_HTTPHEADER, array(
    "oauth-token: {$oauth_token}"
));

//execute request
$curl_response = curl_exec($curl_request);

//Get Return Headers
$header_size = curl_getinfo($curl_request,CURLINFO_HEADER_SIZE);
$headers = substr($curl_response, 0, $header_size);

//Outputting the file contents
echo 'File saved to download.txt';
$file = substr($curl_response, $header_size);
file_put_contents('download.txt', $file);

curl_close($curl_request);

but this code assumes the file name is download.txt, how do I get the filename first

in my example i can get the file info using {{localURL}}Contacts/0e05f7b4-9993-11e9-af70-06a63d65978a/file/ which returns

{
    "picture": {
        "content-type": "image/png",
        "content-length": 53843,
        "name": "ae2c25a0-4ad3-11ea-bbf1-080027633d6c",
        "width": 1611,
        "height": 1612,
        "uri": "rest/v11/Contacts/0e05f7b4-9993-11e9-af70-06a63d65978a/file/picture"
    }
}

but i dont get back the file name to then use in the curl request