cUrl with json string and file upload - php

Question

how do I have to "translate" the following curl command into a valid php curl function?
curl -X POST
-F "images_file=#fruitbowl.jpg"
-F parameters=%7B%22classifier_ids%22%3A%5B%22testtype_205919966%22%5D%2C%22threshold%22%3A0%7D
'https://gateway-a.watsonplatform.net/visual-recognition/api/v3/classify?api_key={key}&version=2016-05-20'"
It seems that I'm doing something wrong and I can't figure out the problem:
$method = 'POST'
$url = 'https://gateway-a.watsonplatform.net/visual-recognition/api/v3/classify?api_key=<myApiKey>&version=2016-05-20'
$data = array(
array(<file-information>),
array(<json-string>),
)
$header = array(
'Content-Type: application/json',
'Content-Length: ' . strlen(<json-string>),
)
)
public function send($method, $url, $data = null, $header = null)
{
$curl = curl_init();
switch ($method) {
case "POST":
curl_setopt($curl, CURLOPT_POST, 1);
if ($data) {
$postData = $this->renderPostData($data);
curl_setopt($curl, CURLOPT_POSTFIELDS, $postData);
}
break;
}
if($header) {
curl_setopt($curl, CURLOPT_HEADER, 1);
curl_setopt($curl,CURLOPT_HTTPHEADER,$header);
}
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$response = curl_exec($curl);
}
protected function renderPostData($data)
{
$postData = array();
foreach ($data as $file) {
if ($file['isFile']) {
if(pathinfo($file['path'], PATHINFO_EXTENSION) == 'zip'){
$postData[$file['name']] = new \CURLFile($file['path'], 'application/zip', $file['name']);
}
else {
$postData[$file['name']] = new \CURLFile($file['path'], 'application/octet-stream', $file['name']);
}
} else {
// this contains the json encoded string
$postData[$file['name']] = $file['path'];
}
}
return $postData;
}
I tried several variations and the Watson Visual Recognition API error is now:
{
"custom_classes": 0,
"images": [
{
"error": {
"description": "Invalid image data. Supported formats are JPG and PNG.",
"error_id": "input_error"
}
}
],
"images_processed": 1
}
before it was:
{
"error": {
"code": 400,
"description": "Invalid JSON content received. Unable to parse.",
"error_id": "parameter_error"
},
"images_processed": 0
}
Thank you for your help!

Answer 1

My issue was this line:
$postData[$file['name']] = new \CURLFile($file['path'], 'application/zip', $file['name']);
the last parameter is the $postname. So to fix this issue I had to change this line to:
$postData[$file['name']] = new \CURLFile($file['path'], mime_content_type($file['path']), basename($file['path']));
and it worked - after I also removed the wrong $header completely
:)