Uploading files to S3 with OKHttp

UploadToS3Test.java

package com.cornershopapp.shopper.android.utils;

import java.io.File;
import java.io.IOException;

import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class UploadToS3Test {

    /*
    {	'url': 'https://devel.s3.amazonaws.com/',
		'fields': {
			'policy': 'eyJjb25kaXRpb2dzIjogW3siYWNsIjogInB1YmxpYy1yZWFkIn0sIHsiYnVja2V0IjogImNvcm5lcnNob3Atc2hvcHBlci1hcGktdGVzdCJ9LCB7ImtleSI6ICJjb3JuZXJzaG9wLXNob3BwZXItYXBpLXRlc3QtZmlsZS0zOTIuanBnIn1dLCAiZXhwaXJhdGlvbiI6ICIyMDE4LTA0LTEzVDIyOjQxOjA0WiJ9',
			'AWSAccessKeyId': 'AKIAIVQWW6OWBKLD4TXQ',
			'signature': 'CsM12nmHOEUdf9Z50KF2rYhahko=',
			'key': 'cornershop-shopper-api-test-file-392.jpg',
			'acl': 'public-read'
		}
	}
	*/

    public static void main(String[] params) {

        String receivedUrl = "https://cornershop-shopper-api-test.s3.amazonaws.com/";
        String fileName = "/Users/devpicon/Dev/javautils/IMG_20180413_115857_609.jpg";
        File uploadFile = new File(fileName);

        String boundary = "===" + System.currentTimeMillis() + "===";

        System.out.println("receivedUrl=" + receivedUrl);
        System.out.println("fileName=" + fileName);
        System.out.println("boundary=" + boundary);

        try {
            uploadObject(uploadFile);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


    public static void uploadObject(File file) throws IOException {
        OkHttpClient client = new OkHttpClient();

        MediaType mediaType = MediaType.parse("image/jpg");
        RequestBody requestBody = RequestBody.create(mediaType, file);

        MultipartBody multipartBody = new MultipartBody.Builder("---DevApp")
                .addFormDataPart("AWSAccessKeyId", "AKIAJCBCKQITFUEAAITA")
                .addFormDataPart("acl", "public-read")
                .addFormDataPart("key", "formtasks/images/19463-selfie.jpg")
                .addFormDataPart("signature", "kos3NHJW+qUaQMpYZfaOs19hUMRw=")
                .addFormDataPart("policy", "eyJjb25kaXRpb25zIjogd3siYWNsIjogInB1YmxpYy1yZWFkIn0sIHsiQ29udGVudC1UeXBlIjogImltYWdlL2pwZyJ9LCB7ImJ1Y2tldCI6ICJzaG9wcGluZy1kZXZlbCJ9LCB7ImtleSI6ICJmb3JtdGFza3MvaW1hZ2VzLzE5NDYzLXNlbGZpZS5qcGcifV0sICJleHBpcmF0aW9uIjogIjIwMTgtMDQtMTdUMjE6NTU6NDhaIn0=")
                .addFormDataPart("Content-Type", "image/jpg")
                .addFormDataPart("file", null, requestBody).build();


        Request request = new Request.Builder()
                .url("https://devel.s3.amazonaws.com/")
                .post(multipartBody)
                .addHeader("content-type", "multipart/form-data;")
                .addHeader("cache-control", "no-cache")
                .build();

        Response execute = client.newCall(request).execute();
        System.out.println(execute.body().string());
    }

}