This OkHttp application interceptor reads local json file. The json file name is passed as a path in service

CustomService.kt

interface CustomService {
    @GET("veggies.json") 
    fun getVeggies(): Single<Response<CustomGenericResponse<List<Veggie>>>>
}

LocalJsonInterceptor.kt

class LocalJsonInterceptor(private val context: Context) : Interceptor {
    override fun intercept(chain: Chain): Response {
        try {
            val pathSegments = chain.request().url.pathSegments
            if (pathSegments.isNotEmpty()) {
                val scenario = pathSegments.first()

                val inputStream = context.assets.open(scenario)
                var mimeType = URLConnection.guessContentTypeFromStream(inputStream)
                if (mimeType == null) {
                    mimeType = "application/json"
                }
                return Response.Builder()
                    .addHeader("content-type", mimeType)
                    .body(ResponseBody.create(mimeType.toMediaTypeOrNull(), toByteArray(inputStream)))
                    .code(200)
                    .message("Mock response from assets/".plus(scenario))
                    .protocol(Protocol.HTTP_1_0)
                    .request(chain.request())
                    .build()
            } else {
                throw Exception("no path is found")
            }
        } catch (e: IOException) {
            e.printStackTrace()
            throw Exception(e)
        }
    }

    private fun toByteArray(inputStream: InputStream): ByteArray {
        val outputStream = ByteArrayOutputStream()
        inputStream.use { input ->
            outputStream.use { output ->
                input.copyTo(output)
            }
        }
        return outputStream.toByteArray()

    }
}