Help with ExternalResourceClient with multipart/form-data?

Question

I need some help with ExternalResourceClient with multipart/form-data? I tried following the examples at https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_12.0/Integration/ExternalResourceClient/ but they don't handle multiipart/form-data. 
 I need to convert this CURL 
 $curl_post_data = [
 'input' => $input,
 'scriptName' => $scriptName
];

curl_setopt_array($curl, array(
 CURLOPT_URL => $url,
 CURLOPT_RETURNTRANSFER => true,
 CURLOPT_ENCODING => '',
 CURLOPT_MAXREDIRS => 3,
 CURLOPT_TIMEOUT => 10,
 CURLOPT_FOLLOWLOCATION => true,
 CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
 CURLOPT_CUSTOMREQUEST => 'POST',
 CURLOPT_POSTFIELDS => $curl_post_data,
 CURLOPT_USERPWD => $credentials,
));

$response = curl_exec($curl);
 
 When this gets sent to the server the POST variables are sent as Content-Type : multipart/form-data; 
 The issue I have with the ExternalResourceClient is that expects the Content-Type to be application/x-www-form-urlencoded which the application does not accept. 
 How do I add a boundary to the $curl_post_data? 
 $erc = new \Sugarcrm\Sugarcrm\Security\HttpClient\ExternalResourceClient();
$boundary = '--------------------------'.microtime(true);
$curl_post_data = [
 'input' => $input,
 'scriptName' => $scriptName
];

$response = $erc->post($url, $curl_post_data, [
 'Content-Type' => "multipart/form-data; boundary=$boundary",
 'Authorization' => 'Basic '. base64_encode($credentials),
 'Accept' => '*/*'
]);

//How do I add boundary to the $curl_post_data?

Jeff Bickart · Answer

Hi Jeff Bickart , 
 Have you looked into the upload method of the ExternalResourceClient ? (here's for reference) 
 public function upload(\UploadFile $file, string $url, string $method = 'POST', array $body = [], array $headers = []): ResponseInterface
{
 $boundary = '--------------------------' . microtime(true);
 $requestHeaders = array_merge(['Content-type' => 'multipart/form-data; boundary=' . $boundary], $headers);
 $fileContents = $file->get_file_contents();
 $content = "--" . $boundary . "
" .
 "Content-Disposition: form-data; name=\"" . $file->field_name . "\"; filename=\"" . basename($file->get_temp_file_location()) . "\"
" .
 "Content-Type: application/zip

" .
 $fileContents . "
";
 foreach ($body as $name => $value) {
 $content .= "--" . $boundary . "
" .
 "Content-Disposition: form-data; name=\"{$name}\"

" .
 "{$value}
";
 }
 $content .= "--" . $boundary . "--
";
 return $this->request($method, $url, $content, $requestHeaders);
} 
 Can you try something like this? 
 $erc = new \Sugarcrm\Sugarcrm\Security\HttpClient\ExternalResourceClient();
$boundary = '--------------------------'.microtime(true);
$curl_post_data = [
 'input' => $input,
 'scriptName' => $scriptName
];

$content = "--" . $boundary . "
";
foreach ($curl_post_data as $name => $value) {
 $content .= "--" . $boundary . "
" .
 "Content-Disposition: form-data; name=\"{$name}\"

" .
 "{$value}
";
}

$content .= "--" . $boundary . "--
";

$response = $erc->post($url, $content, [
 'Content-Type' => "multipart/form-data; boundary=$boundary",
 'Authorization' => 'Basic '. base64_encode($credentials),
 'Accept' => '*/*'
]);