Custom ReportSender for HockeyApp and ACRA with OkHTTP in Kotlin

HockeySender.kt

package net.hockeyapp.android.demo

import com.squareup.okhttp.FormEncodingBuilder
import com.squareup.okhttp.OkHttpClient
import com.squareup.okhttp.Request
import org.acra.ACRA
import org.acra.ReportField
import org.acra.collector.CrashReportData
import org.acra.sender.ReportSender
import java.util.Date
import java.util.Locale

class HockeyappCrashSender : ReportSender {

    override fun send(report: CrashReportData) {
        val log = createCrashLog(report)
        val url = "https://rink.hockeyapp.net/api/2/apps/${ACRA.getConfig().formKey()}/crashes"

        try {
            val bodyBuilder = FormEncodingBuilder() //
                    .add("raw", log) //
                    .add("userID", report.get(ReportField.INSTALLATION_ID) ?: "") //
                    .add("contact", report.get(ReportField.USER_EMAIL) ?: "") //
                    .add("description", report.get(ReportField.USER_COMMENT) ?: "")

            val post = Request.Builder() //
                    .url(url) //
                    .post(bodyBuilder.build())

            OkHttpClient().newCall(post.build()).execute()
        } catch (e: Exception) {
            e.printStackTrace()
        }

    }

    private fun createCrashLog(report: CrashReportData) = StringBuilder {
        append("Package: ").append(report.get(ReportField.PACKAGE_NAME)).append("\n")
        append("Version Code: ").append(report.get(ReportField.APP_VERSION_CODE)).append("\n")
        append("Version Name: ").append(report.get(ReportField.APP_VERSION_NAME)).append("\n")
        append("Android: ").append(report.get(ReportField.ANDROID_VERSION)).append("\n")
        append("Manufacturer: ").append(android.os.Build.MANUFACTURER).append("\n")
        append("Model: ").append(report.get(ReportField.PHONE_MODEL)).append("\n")
        append("Custom: ").append("\n").append(report.get(ReportField.CUSTOM_DATA))
        append("Language: ").append(Locale.getDefault().getLanguage()).append("\n")
        append("Date: ").append(Date()).append("\n")
        append("\n")
        append(report.get(ReportField.STACK_TRACE))
    }.toString()

}