1 files changed, 117 insertions, 0 deletions
diff --git a/wallet/src/main/java/net/taler/wallet/peer/PeerManager.kt b/wallet/src/main/java/net/taler/wallet/peer/PeerManager.kt
new file mode 100644
index 0000000..898dcfd
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/peer/PeerManager.kt
@@ -0,0 +1,117 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2022 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 <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.peer
+
+import android.graphics.Bitmap
+import android.util.Log
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.serialization.Serializable
+import net.taler.common.Amount
+import net.taler.common.QrCodeManager
+import net.taler.wallet.TAG
+import net.taler.wallet.backend.TalerErrorInfo
+import net.taler.wallet.backend.WalletBackendApi
+import net.taler.wallet.exchanges.ExchangeItem
+import org.json.JSONObject
+
+class PeerManager(
+    private val api: WalletBackendApi,
+    private val scope: CoroutineScope,
+) {
+
+    private val _pullState = MutableStateFlow<PeerPaymentState>(PeerPaymentIntro)
+    val pullState: StateFlow<PeerPaymentState> = _pullState
+
+    private val _pushState = MutableStateFlow<PeerPaymentState>(PeerPaymentIntro)
+    val pushState: StateFlow<PeerPaymentState> = _pushState
+
+    fun initiatePullPayment(amount: Amount, exchange: ExchangeItem) {
+        _pullState.value = PeerPaymentCreating
+        scope.launch(Dispatchers.IO) {
+            api.request("initiatePeerPullPayment", InitiatePeerPullPaymentResponse.serializer()) {
+                put("exchangeBaseUrl", exchange.exchangeBaseUrl)
+                put("amount", amount.toJSONString())
+                put("partialContractTerms", JSONObject().apply {
+                    put("summary", "test")
+                })
+            }.onSuccess {
+                val qrCode = QrCodeManager.makeQrCode(it.talerUri)
+                _pullState.value = PeerPaymentResponse(it.talerUri, qrCode)
+            }.onError { error ->
+                Log.e(TAG, "got initiatePeerPullPayment error result $error")
+                _pullState.value = PeerPaymentError(error)
+            }
+        }
+    }
+
+    fun resetPullPayment() {
+        _pullState.value = PeerPaymentIntro
+    }
+
+    fun initiatePeerPushPayment(amount: Amount, summary: String) {
+        _pushState.value = PeerPaymentCreating
+        scope.launch(Dispatchers.IO) {
+            api.request("initiatePeerPushPayment", InitiatePeerPushPaymentResponse.serializer()) {
+                put("amount", amount.toJSONString())
+                put("partialContractTerms", JSONObject().apply {
+                    put("summary", summary)
+                })
+            }.onSuccess { response ->
+                val qrCode = QrCodeManager.makeQrCode(response.talerUri)
+                _pushState.value = PeerPaymentResponse(response.talerUri, qrCode)
+            }.onError { error ->
+                Log.e(TAG, "got initiatePeerPushPayment error result $error")
+                _pushState.value = PeerPaymentError(error)
+            }
+        }
+    }
+
+    fun resetPushPayment() {
+        _pushState.value = PeerPaymentIntro
+    }
+
+}
+
+sealed class PeerPaymentState
+object PeerPaymentIntro : PeerPaymentState()
+object PeerPaymentCreating : PeerPaymentState()
+data class PeerPaymentResponse(
+    val talerUri: String,
+    val qrCode: Bitmap,
+) : PeerPaymentState()
+
+data class PeerPaymentError(
+    val info: TalerErrorInfo,
+) : PeerPaymentState()
+
+@Serializable
+data class InitiatePeerPullPaymentResponse(
+    /**
+     * Taler URI for the other party to make the payment that was requested.
+     */
+    val talerUri: String,
+)
+
+@Serializable
+data class InitiatePeerPushPaymentResponse(
+    val exchangeBaseUrl: String,
+    val talerUri: String,
+)