CloudAutoMLViewModel.kt

    companion object {
        private const val PROJECT = "devnibbles"
        private const val LOCATION = "us-central1"
        private const val MODEL = "ICN3704829353327390855"
        private const val ACCESS_TOKEN = "<insert token here>"
    }

    fun classifyUsingRetrofit(faceId: Int, imageBytes: ByteArray) {
        launch(errorHandler) {
            // Show loading indicator while we wait for the request.
            mResult.value = LoadingResource(null)

            // Build the body of our request, essentially the image to be classified.
            val body = CloudAutoMLModel(
                Payload(
                    MlImage(
                        String(
                            Base64.encodeBase64(imageBytes)
                        )
                    )
                )
            )

            // Define the authentication credentials and make the API request
            val response = getRESTService().classify(
                "Bearer $ACCESS_TOKEN",
                PROJECT, LOCATION, MODEL, body
            ).await()

            if (response.payload?.isNotEmpty() == true) {
                // We have a prediction!
                var predictedName: String? = null

                response.payload.forEach { entry ->
                    // TODO: Check that score is within a valid threshold.
                    if (entry.displayName != null) {
                        predictedName = entry.displayName
                    }
                }

                if (predictedName != null) {
                    // We had an actual name returned
                    mResult.postValue(SuccessResource(Pair(faceId, predictedName!!)))
                } else {
                    // No name was returned, this is an unknown face.
                    mResult.postValue(ErrorResource(null, Pair(-1, "Not recognised (001)")))
                }
            } else {
                // There were no payloads returned, possible error or unknown face.
                mResult.postValue(ErrorResource(null, Pair(-1, "Not recognised (002)")))
            }
        }
    }