How to publish media (image) on Mastodon using API? - php

Question

I'm trying to POST an image on Mastodon (specifically on Humblr) but I cannot get the media_id, the response is null, but I'm not sure where the problem is.
I can publish text, no problem, so the authentication part is fine, I only have the problem with the image, the only difference I can see in the documentation is that "Media file encoded using multipart/form-data".
Here's my code so far...
$headers = ['Authorization: Bearer '.$settings['access_token'] , 'Content-Type: multipart/form-data'];
$mime_type = mime_content_type($urlImage);
$cf = curl_file_create($urlImage,$mime_type,'file');
$media_data = array( "file" => $cf);
$ch_status = curl_init();
curl_setopt($ch_status, CURLOPT_URL, "https://humblr.social/api/v1/media");
curl_setopt($ch_status, CURLOPT_POST, 1);
curl_setopt($ch_status, CURLOPT_POSTFIELDS, $media_data);
curl_setopt($ch_status, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch_status, CURLOPT_HTTPHEADER, $headers);
$media_status = json_decode(curl_exec($ch_status));
echo "Response: ".json_encode($media_status);
From this I want to extract the $media_status-> media_id
I don't really know much about 'multipart/form-data' to be honest.
Am I missing something?

Answer 1

This took some trial and error for me as well. Here's what worked for me (PHP 7.3):
$curl_file = curl_file_create('/path/to/file.jpg','image/jpg','file.jpg');
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://instanceurl.com/api/v1/media');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'Authorization: Bearer YOUR_TOKEN_HERE',
'Content-Type: multipart/form-data'
]);
$body = [
'file' => $curl_file
];
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
$response = curl_exec($ch);
if (!$response) {
die('Error: "' . curl_error($ch) . '" - Code: ' . curl_errno($ch));
}
echo 'HTTP Status Code: ' . curl_getinfo($ch, CURLINFO_HTTP_CODE) . PHP_EOL;
echo 'Response Body: ' . $response . PHP_EOL;
curl_close($ch);