Reveal Card Details

class RevealScreen(private val activity: Activity, credentials: WirexCredentialProvider) {
    private val scope = CoroutineScope(Dispatchers.Main)
    private val reveal: WirexReveal = WirexReveal.create(credentials = credentials, testMode = true, chainId = "<chain id>")
        ?: error("this build has no endpoints for that environment")

    fun show(container: LinearLayout, cardId: String) {
        val fields = listOf(WirexRevealField.PAN, WirexRevealField.EXPIRY, WirexRevealField.CVV, WirexRevealField.PIN)
        val session = reveal.session(cardId = cardId, fields = fields, cardholderName = "ALEX GREY")
        val strings = WirexRevealStrings(fieldLabels = mapOf(WirexRevealField.PAN to "Card number"))

        for (field in fields) {
            val row = WirexRevealFieldView(activity)
            row.bind(session, field, strings = strings)
            container.addView(row, MATCH_PARENT, WRAP_CONTENT)
        }

        session.onChange = { snapshot ->
            activity.runOnUiThread { render(snapshot) }
        }

        scope.launch {
            try { session.load() } catch (_: WirexDeclined) { /* the user declined the step-up */ }
        }
    }
}

class ProductionCredentials(private val auth: AuthSession) : WirexCredentialProvider {
    @Volatile private var offered: Pair<WirexActionScope, String>? = null

    fun offerStepUpToken(scope: WirexActionScope, token: String) { offered = scope to token }
    fun revokeOfferedStepUpToken() { offered = null }

    override suspend fun accessToken(): String {
        val current = auth.accessToken()
        if (current != null && current.second - System.currentTimeMillis() > 30_000) return current.first
        return auth.refreshAccessToken() ?: throw WirexError(WirexError.Code.UNAUTHORIZED, retryable = false)
    }

    override suspend fun actionToken(scope: WirexActionScope): String {
        offered?.takeIf { it.first == scope }?.let { offered = null; return it.second }
        return auth.signAction(scope)
    }

    override val userEmail: String? get() = null
    override val userWallet: String? get() = auth.walletAddress
}