PHP Curl with Knack API - Post an image problem - php

Question

Does any here have experience with Knack API(https://www.knack.com/) here?
I'm using PHP curl to post an image.
When I use POSTMAN, the image successfully uploads. But when I copy the code from POSTMAN(postman option to copy the source code) and add it to my source code, knack returns empty object error("Please select a file to upload").
Knack API documentation: https://www.knack.com/developer-documentation/#file-image-uploads
The POSTMAN source code below
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => "https://api.knack.com/v1/applications/app-id/assets/file/upload",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => "------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"files\"; filename=\"C:\\Users\\shavk\\Pictures\\292937.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--",
CURLOPT_HTTPHEADER => array(
"Cache-Control: no-cache",
"Content-Type: application/x-www-form-urlencoded",
"Postman-Token: fe1f4eea-b2b5-2d43-2c3c-c262438866d4",
"X-Knack-Application-Id: id",
"X-Knack-REST-API-Key: key",
"content-type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW"
),
));
$response = curl_exec($curl);
$err = curl_error($curl);
Any help is highly appreciated.

Answer 1

Postman's PHP/curl code generator isn't very good. to upload files in the multipart/form-data-format, use CURLFile.
the code should be
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => "https://api.knack.com/v1/applications/app-id/assets/file/upload",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_POST => 1,
CURLOPT_POSTFIELDS => array(
'files' => new CURLFile("C:\\Users\\shavk\\Pictures\\292937.jpg")
),
CURLOPT_HTTPHEADER => array(
"X-Knack-Application-Id: id",
"X-Knack-REST-API-Key: key",
),
));
$response = curl_exec($curl);
if you are a customer of Postman (using the pro/whatever version), i suggest you make a complaint to customer support about the terrible code generated by the PHP code generator.