Create an Image Share over LinkedIn API V2 not working - linkedin

Question

I use the api version 2.0 and want to create an image share.
LinkedIn describes your image binary file upload process here:
https://learn.microsoft.com/en-us/linkedin/consumer/integrations/self-serve/share-on-linkedin?context=linkedin/consumer/context#create-a-text-share
If you follow the instructions you will get a 400 HTTP error.
I add the Content-Type in the header and get a 201 HTTP status with the X-RestLi-Id in the header. So far so good!
If I want to show my created post on LinkedIn (https://www.linkedin.com/in/me/detail/recent-activity/) I can't find the post with image.
How to fix it? Anybody got an idea?
PHP code:
$imageRequestData = array(
"registerUploadRequest" => array(
"recipes" => array(
"urn:li:digitalmediaRecipe:feedshare-image"
),
"owner" => $urn, // Person URN === urn:li:person:XXXX
"serviceRelationships" => array(
array(
"relationshipType" => "OWNER",
"identifier" => "urn:li:userGeneratedContent"
)
)
)
);
$image_request = $this->post('v2/assets?action=registerUpload', $imageRequestData);
$headers = array();
$headers[] = 'Authorization: Bearer ' . $this->accessToken;
$headers[] = 'X-Restli-Protocol-Version: 2.0.0';
$headers[] = 'Content-Type: ' . mime_content_type($image_path); //ex. image/png
$ch = curl_init();
$options = array(
CURLOPT_HEADER => true,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_URL => $image_request['message']['value']['uploadMechanism']
['com.linkedin.digitalmedia.uploading.MediaUploadHttpRequest']['uploadUrl'],
CURLOPT_HTTPHEADER => $headers,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_POST => true,
CURLOPT_CONNECTTIMEOUT => $this->connectTimeout,
CURLOPT_TIMEOUT => $this->timeout,
CURLOPT_POSTFIELDS => array("upload-file" => new CURLFile($image_path))
);
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$content = array(
'author' => $urn, // Person URN === urn:li:person:XXX
'lifecycleState' => 'PUBLISHED',
'specificContent' => array(
"com.linkedin.ugc.ShareContent" => array(
'shareCommentary' => array(
"text" => $comment,
),
'shareMediaCategory' => 'IMAGE',
// NONE - The share does not contain any media, only text.
// ARTICLE - The share contains a URL.
// IMAGE - The Share contains an image.
'media' => array(
"status" => "READY",
"media" => $image_request['message']['value']['asset']
)
)
),
"visibility" => array(
"com.linkedin.ugc.MemberNetworkVisibility" => "PUBLIC"
)
);
$postfields = json_encode($content);
$headers = array();
$headers[] = 'x-li-format: json';
$headers[] = 'Authorization: Bearer ' . $this->accessToken;
$headers[] = 'Content-Type: application/json';
$headers[] = 'Content-Length: ' . strlen($postfields);
$headers[] = 'X-Restli-Protocol-Version: 2.0.0';
$ch = curl_init();
$options = array(
CURLOPT_HEADER => true,
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_URL => 'https://api.linkedin.com/v2/ugcPosts',
CURLOPT_HTTPHEADER => $headers,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_POST => true,
CURLOPT_CONNECTTIMEOUT => $this->connectTimeout,
CURLOPT_TIMEOUT => $this->timeout,
CURLOPT_POSTFIELDS => $postfields
);
curl_setopt_array($ch, $options);
$response = curl_exec($ch);

Answer 1

You need to change your request to PUT and keep default for SSL VerifyPeer:
$headers = array();
$headers[] = 'Authorization: Bearer ' . $this->accessToken;
$headers[] = 'X-Restli-Protocol-Version: 2.0.0';
$headers[] = 'Content-Type: multipart/form-data';
$ch = curl_init();
$options = array(
CURLOPT_HEADER => true,
CURLOPT_CUSTOMREQUEST => 'PUT', //need to set custom request to PUT instead of post
CURLOPT_RETURNTRANSFER => true,
CURLOPT_URL => $image_request['message']['value']['uploadMechanism']
['com.linkedin.digitalmedia.uploading.MediaUploadHttpRequest']['uploadUrl'],
CURLOPT_HTTPHEADER => $headers,
// CURLOPT_SSL_VERIFYPEER => false, //keep default options
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_POST => true,
CURLOPT_CONNECTTIMEOUT => $this->connectTimeout,
CURLOPT_TIMEOUT => $this->timeout,
CURLOPT_POSTFIELDS => array("upload-file" => new CURLFile($image_path))
);
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
Or use GuzzleHttp\Client to simplify the upload:
$client =new \GuzzleHttp\Client();
$client->request('PUT',
$image_request['message']['value']['uploadMechanism'] // ↵
['com.linkedin.digitalmedia.uploading.MediaUploadHttpRequest']['uploadUrl'],
[
'headers' => [
'Authorization' => 'Bearer ' . $this->accessToken
],
'body' => fopen($image_path, 'r'),
]