I'd suppose this is the wrong way to get the size ...

# squarelibraries

[dave08]

I'd suppose this is the wrong way to get the size of a download from OkHttp (I think I saw this posted somewhere...):

suspend fun Call.getDownloadSize(
		blockingDispatcher: CoroutineDispatcher = OK_IO
)Long = withContext(blockingDispatcher) {
	suspendCancellableCoroutine<Long> { cont ->
		cont.invokeOnCancellation {
			cancel()
		}
		enqueue(object : Callback {
			override fun onFailure(call: Call?, e: IOException) {
				cont.resumeWithException(e)
			}

			fun Response.getDownloadSizeFromHeader(): Long? = header("Content-Range")
					?.substringAfter('/')
					?.toLongOrNull()
					?.also { this.body()?.close() }

			fun Response.getDownloadSizeFromBody(): Long? {
				body().use {
					return it?.contentLength()
				}
			}

			override fun onResponse(call: Call?, response: Response) {
				if (!response.isSuccessful) {
					cont.resumeWithException(IOException("Unexpected HTTP code: ${response.code()}"))
					return
				}
				try {
					val size = response.run {
						getDownloadSizeFromHeader() ?: getDownloadSizeFromBody()
					}

					if (size != null && size != -1L) {
						cont.resume(size)
					} else {
						cont.resumeWithException(IOException("Unknown size"))
					}
				} catch (e: Exception) {
					cont.resumeWithException(e)
				}
			}
		})
	}
}

What's the best way to do this (that would work with all S3 compatible storages)?