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An OkHttp wrapper based on RxJava using Jackson for JSON

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package com.lightningkite.rx.okhttp

import io.reactivex.rxjava3.core.Single
import okhttp3.MediaType
import okhttp3.MultipartBody
import okhttp3.RequestBody
import okhttp3.RequestBody.Companion.toRequestBody
import okio.BufferedSink
import okio.Okio
import java.io.ByteArrayOutputStream
import java.io.File

/**
 * Transforms a given object into a JSON request body using the [defaultJsonMapper].
 */
fun Any?.toJsonRequestBody(): RequestBody {
    val sending = defaultJsonMapper.writeValueAsString(this)
    return sending.toRequestBody(MediaType.JSON)
}

/**
 * A shortcut for using the [MultipartBody.Builder].
 */
fun MultipartBody.Companion.from(vararg parts: MultipartBody.Part): RequestBody = from(parts.toList())

/**
 * A shortcut for using the [MultipartBody.Builder].
 */
fun MultipartBody.Companion.from(parts: List): RequestBody {
    return MultipartBody.Builder().setType(MultipartBody.FORM).also {
        for (part in parts) {
            it.addPart(part)
        }
    }.build()
}