How to convert curl call with “-i --upload-file” into PHP? - linkedin

Question

This call is referenced in step 2 of the docs here
I am following the docs to create an image and text share in LinkedIn through the version 2 API. Following the steps in the docs, I completed each step with a successful response. However, my post does not exist in LinkedIn, and cannot be viewed by direct link based on the ID returned by the API request
In debuging I made a get request to https://api.linkedin.com/v2/assets/C5622AQFbyxMfU2b9zg. This is to retrieve the media asset (docs here) created in the first step. It returned the following json with the 'CLIENT_ERROR' status. If you look at the docs though, this status is not one of those listed for the field
{
"serviceRelationships": [
{
"identifier": "urn:li:userGeneratedContent",
"relationshipType": "OWNER"
}
],
"recipes": [
{
"recipe": "urn:li:digitalmediaRecipe:feedshare-image",
"status": "CLIENT_ERROR"
}
],
"mediaTypeFamily": "STILLIMAGE",
"created": 1550875198973,
"lastModified": 1550875199857,
"id": "C5622AQFbyxMfU2b9zg",
"status": "ALLOWED"
}
I was able to successfully upload the file using the command line curl. It seems the issue is with my PHP implementation. Specifically the upload of the binary file is not working right. Here is a simplified representation of my php code.
$ch = curl_init();
$headers = [
'Authorization: Bearer ' . $this->accessToken->access_token,
'Cache-Control: no-cache',
'X-RestLi-Protocol-Version: 2.0.0',
'x-li-format: json',
'Content-Type: ' . $this->mimetype
];
$data = [
'file' => curl_file_create($filename, $this->mimetype);
];
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_URL, 'https://api.linkedin.com/mediaUpload/C5622AQHSLBWkZeg-gQ/feedshare-uploadedImage/0?ca=vector_feedshare&cn=uploads&m=AQJIFvVUxXl7yAAAAWkwjT0kEPKHY5BnAgXETcVQ3AbsxmvaGl6hnuECwA&app=22961836&sync=0&v=beta&ut=2RaKRdHD_OwUE1');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$result = curl_exec($ch);
print_r($result);

Answer 1

I ran into this same issue recently and linkedin's documents were not very helpful.
Create an Image Share.
The first thing to understand is that "curl --upload-file" uses a PUT request method. Here is what I used using dummy data.
$file = "/storage/media/testimg.jpg";
$uploadurl = "https://api.linkedin.com/mediaUpload/C5622AQHSLBWkZeg-gQ/feedshare-uploadedImage/0?ca=vector_feedshare&cn=uploads&m=AQJIFvVUxXl7yAAAAWkwjT0kEPKHY5BnAgXETcVQ3AbsxmvaGl6hnuECwA&app=22961836&sync=0&v=beta&ut=2RaKRdHD_OwUE1";
$accesstoken = "acacdsv13rv31bv13b1cf13cf13rv13rv13vr13tb5dxvghn";
$curl_handle=curl_init();
curl_setopt($curl_handle, CURLOPT_URL, $uploadurl);
curl_setopt($curl_handle, CURLOPT_PUT, 1);
curl_setopt($curl_handle, CURLOPT_CUSTOMREQUEST, "PUT");
$fh_res = fopen($file, 'r');
curl_setopt($curl_handle, CURLOPT_INFILE, $fh_res);
curl_setopt($curl_handle, CURLOPT_INFILESIZE, filesize($file));
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
$headers[] = "Authorization: Bearer $accesstoken"; //linkedin says to add 'redacted' instead of access token (that's bullshit)
$headers[] = 'Connection: Keep-Alive';
$headers[] = "X-RestLi-Protocol-Version:2.0.0";
curl_setopt($curl_handle,CURLOPT_HTTPHEADER,$headers);
$rcurl = curl_exec($curl_handle);
curl_close($curl_handle);
If you dump the response $rcurl you only get an empty string. So the next step is to check the status of the upload, something they completely forgot to mention as part of the image share documentation but can be found here Check Status of Uphold
Using the asset variable from the initial image register call, you check the upload's status until the status check returns AVAILABLE.
$asset = "urn:li:digitalmediaAsset:C4asdfvqqrv3";
$a = explode("digitalmediaAsset:", $asset);
$statuscheck = make a GET curl call to the url: "/assets/" . $a[1]
$uploadstat = $statuscheck['recipes'][0]['status'];
do{
$statuscheck = make a GET curl call to the url: "/assets/" . $a[1];
$uploadstat = $statuscheck['recipes'][0]['status'];
}while($uploadstat != 'AVAILABLE');
Once AVAILABLE is returned, you can now proceed to the next step of creating the image share. Hope this helps.