val userAgent = sanitiseUserAgent(adjustUserAgent(System.getProperty("http.agent")))

fun sanitiseUserAgent(ua: String) =
    try {
        String(ua.toByteArray(charset(charsetName = "US-ASCII")))
    } catch (e: UnsupportedEncodingException) {
        CrashReportingService.logException(e)
        adjustUserAgent(fallbackUserAgent)
    }

private val fallbackUserAgent = String.format(
    "Dalvik/2.1.0 (Linux; U; Android %s; %s Build/%s)",
    Build.VERSION.RELEASE, Build.MODEL, Build.ID
)

private fun adjustUserAgent(ua: String?) =
    "$ua Luno/${BuildConfig.VERSION_NAME}/${BuildConfig.VERSION_CODE}"