/*
* This file is part of GNU Taler
* (C) 2020 Taler Systems S.A.
*
* GNU Taler is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3, or (at your option) any later version.
*
* GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Taler; see the file COPYING. If not, see
*/
package net.taler.wallet.payment
import android.util.Log
import androidx.annotation.UiThread
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import net.taler.common.Amount
import net.taler.common.ContractTerms
import net.taler.wallet.TAG
import net.taler.wallet.backend.WalletBackendApi
import net.taler.wallet.payment.PreparePayResponse.AlreadyConfirmedResponse
import net.taler.wallet.payment.PreparePayResponse.InsufficientBalanceResponse
import net.taler.wallet.payment.PreparePayResponse.PaymentPossibleResponse
import org.json.JSONObject
import java.net.MalformedURLException
val REGEX_PRODUCT_IMAGE = Regex("^data:image/(jpeg|png);base64,([A-Za-z0-9+/=]+)$")
sealed class PayStatus {
object None : PayStatus()
object Loading : PayStatus()
data class Prepared(
val contractTerms: ContractTerms,
val proposalId: String,
val totalFees: Amount
) : PayStatus()
data class InsufficientBalance(val contractTerms: ContractTerms) : PayStatus()
object AlreadyPaid : PayStatus()
data class Error(val error: String) : PayStatus()
data class Success(val currency: String) : PayStatus()
}
class PaymentManager(
private val walletBackendApi: WalletBackendApi,
private val mapper: ObjectMapper
) {
private val mPayStatus = MutableLiveData(PayStatus.None)
internal val payStatus: LiveData = mPayStatus
private val mDetailsShown = MutableLiveData()
internal val detailsShown: LiveData = mDetailsShown
@UiThread
fun preparePay(url: String) {
mPayStatus.value = PayStatus.Loading
mDetailsShown.value = false
val args = JSONObject(mapOf("talerPayUri" to url))
walletBackendApi.sendRequest("preparePay", args) { isError, result ->
if (isError) {
handleError("preparePay", result.toString(2))
return@sendRequest
}
val response: PreparePayResponse = mapper.readValue(result.toString())
Log.e(TAG, "PreparePayResponse $response")
mPayStatus.value = when (response) {
is PaymentPossibleResponse -> TODO()
is InsufficientBalanceResponse -> TODO()
is AlreadyConfirmedResponse -> TODO()
}
}
}
private fun getContractTerms(json: JSONObject): ContractTerms {
val terms: ContractTerms = mapper.readValue(json.getString("contractTermsRaw"))
// validate product images
terms.products.forEach { product ->
product.image?.let { image ->
if (REGEX_PRODUCT_IMAGE.matchEntire(image) == null) {
throw MalformedURLException("Invalid image data URL for ${product.description}")
}
}
}
return terms
}
fun confirmPay(proposalId: String, currency: String) {
val args = JSONObject(mapOf("proposalId" to proposalId))
walletBackendApi.sendRequest("confirmPay", args) { isError, result ->
if (isError) {
handleError("preparePay", result.toString())
return@sendRequest
}
mPayStatus.postValue(PayStatus.Success(currency))
}
}
@UiThread
fun abortPay() {
val ps = payStatus.value
if (ps is PayStatus.Prepared) {
abortProposal(ps.proposalId)
}
resetPayStatus()
}
internal fun abortProposal(proposalId: String) {
val args = JSONObject(mapOf("proposalId" to proposalId))
Log.i(TAG, "aborting proposal")
walletBackendApi.sendRequest("abortProposal", args) { isError, result ->
if (isError) {
handleError("abortProposal", result.toString(2))
Log.e(TAG, "received error response to abortProposal")
return@sendRequest
}
mPayStatus.postValue(PayStatus.None)
}
}
@UiThread
fun toggleDetailsShown() {
val oldValue = mDetailsShown.value ?: false
mDetailsShown.value = !oldValue
}
@UiThread
fun resetPayStatus() {
mPayStatus.value = PayStatus.None
}
private fun handleError(operation: String, msg: String) {
Log.e(TAG, "got $operation error result $msg")
mPayStatus.value = PayStatus.Error(msg)
}
}