Pentaho - upload file using API - pentaho

Question

I need to upload a file using an API.
I tried REST CLIENT and didn't find any options.
Tried with HTTP POST and that responded with 415.
Please suggest how to accomplish this

Answer 1

Error 415 is “Unsupported media type”.
You may need to change the media type of the request or check whether that type of file us accepted by the remote server.
https://en.m.wikipedia.org/wiki/List_of_HTTP_status_codes

Answer 2

This solution uses only standard classes of jre 7. Add a step Modified Java Script Value in your transformation. You will have to add two columns in the flow: URL_FORM_POST_MULTIPART_COLUMN and FILE_URL_COLUMN, you can add as many files as you want, you will just have to call outputStreamToRequestBody.write more times.
try
{
//in this step you will need to add two columns from the previous flow -> URL_FORM_POST_MULTIPART_COLUMN, FILE_URL_COLUMN
var serverUrl = new java.net.URL(URL_FORM_POST_MULTIPART_COLUMN);
var boundaryString = "999aaa000zzz09za";
var openBoundary = java.lang.String.format("\n\n--%s\nContent-Disposition: form-data\nContent-Type: text/xml\n\n" , boundaryString);
var closeBoundary = java.lang.String.format("\n\n--%s--\n", boundaryString);
// var netIPSocketAddress = java.net.InetSocketAddress("127.0.0.1", 8888);
// var proxy = java.net.Proxy(java.net.Proxy.Type.HTTP , netIPSocketAddress);
// var urlConnection = serverUrl.openConnection(proxy);
var urlConnection = serverUrl.openConnection();
urlConnection.setDoOutput(true); // Indicate that we want to write to the HTTP request body
urlConnection.setRequestMethod("POST");
//urlConnection.addRequestProperty("Authorization", "Basic " + Authorization);
urlConnection.addRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundaryString);
var outputStreamToRequestBody = urlConnection.getOutputStream();
outputStreamToRequestBody.write(openBoundary.getBytes(java.nio.charset.StandardCharsets.UTF_8));
outputStreamToRequestBody.write(java.nio.file.Files.readAllBytes(java.nio.file.Paths.get(FILE_URL_COLUMN)));
outputStreamToRequestBody.write(closeBoundary.getBytes(java.nio.charset.StandardCharsets.UTF_8));
outputStreamToRequestBody.flush();
var httpResponseReader = new java.io.BufferedReader(new java.io.InputStreamReader(urlConnection.getInputStream()));
var lineRead = "";
var finalText = "";
while((lineRead = httpResponseReader.readLine()) != null) {
finalText += lineRead;
}
var status = urlConnection.getResponseCode();
var result = finalText;
var time = new Date();
}
catch(e)
{
Alert(e);
}

Answer 3

I solved this by using the solution from http://www.dietz-solutions.com/2017/06/pentaho-data-integration-multi-part.html
Thanks Ben.
He's written a Java class for Multi-part Form submission. I extendd by adding a header for Authorization...