KTOR upload file to AWS S3

.kt

import io.ktor.client.plugins.onUpload
import io.ktor.client.request.forms.MultiPartFormDataContent
import io.ktor.client.request.forms.formData
import io.ktor.client.request.post
import io.ktor.client.request.setBody
import io.ktor.client.statement.HttpResponse
import io.ktor.client.statement.bodyAsText
import io.ktor.http.Headers
import io.ktor.http.HttpHeaders
import kotlinx.coroutines.runBlocking
import java.io.File

public fun main() {
    runBlocking {
        val client = getGetHttpClient()

        val response: HttpResponse =
            client.post("https://large-ingest-bucket-xxxxxx.s3.amazonaws.com/") {
                setBody(
                    MultiPartFormDataContent(
                        // form data from 
                        formData {
                            append(
                                "key",
                                "xxxx.dat"
                            )
                            append("AWSAccessKeyId", "...")
                            append(
                                "x-amz-security-token",
                                "..."
                            )
                            append(
                                "policy",
                                  "...."
                            )
                            append("signature", "....")

                            append("file",
                                File("/path_to_your_zip_file").readBytes(),
                                Headers.build {
                                    append(HttpHeaders.ContentType, "application/zip")
                                })
                        }
                    )
                )
                onUpload { bytesSentTotal, contentLength ->
                    println("Sent $bytesSentTotal bytes from $contentLength")
                }
            }

        println(response.bodyAsText())
    }
}