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diff --git a/merchant-lib/src/main/java/net/taler/merchantlib/Orders.kt b/merchant-lib/src/main/java/net/taler/merchantlib/Orders.kt
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+/*
+ * 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 <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.merchantlib
+
+import kotlinx.serialization.Decoder
+import kotlinx.serialization.Encoder
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.Serializer
+import kotlinx.serialization.json.JsonInput
+import kotlinx.serialization.json.JsonObject
+import net.taler.common.ContractTerms
+import net.taler.common.Duration
+
+@Serializable
+data class PostOrderRequest(
+ @SerialName("order")
+ val contractTerms: ContractTerms,
+ @SerialName("refund_delay")
+ val refundDelay: Duration? = null
+)
+
+@Serializable
+data class PostOrderResponse(
+ @SerialName("order_id")
+ val orderId: String
+)
+
+@Serializable
+sealed class CheckPaymentResponse {
+ abstract val paid: Boolean
+
+ @Serializer(forClass = CheckPaymentResponse::class)
+ companion object : KSerializer<CheckPaymentResponse> {
+ override fun deserialize(decoder: Decoder): CheckPaymentResponse {
+ val input = decoder as JsonInput
+ val tree = input.decodeJson() as JsonObject
+ val orderStatus = tree.getPrimitive("order_status").content
+// return if (orderStatus == "paid") decoder.json.fromJson(Paid.serializer(), tree)
+// else decoder.json.fromJson(Unpaid.serializer(), tree)
+ // manual parsing due to https://github.com/Kotlin/kotlinx.serialization/issues/576
+ return if (orderStatus == "paid") Paid(
+ refunded = tree.getPrimitive("refunded").boolean
+ ) else Unpaid(
+ talerPayUri = tree.getPrimitive("taler_pay_uri").content
+ )
+ }
+
+ override fun serialize(encoder: Encoder, value: CheckPaymentResponse) = when (value) {
+ is Unpaid -> Unpaid.serializer().serialize(encoder, value)
+ is Paid -> Paid.serializer().serialize(encoder, value)
+ }
+ }
+
+ @Serializable
+ data class Unpaid(
+ override val paid: Boolean = false,
+ @SerialName("taler_pay_uri")
+ val talerPayUri: String,
+ @SerialName("already_paid_order_id")
+ val alreadyPaidOrderId: String? = null
+ ) : CheckPaymentResponse()
+
+ @Serializable
+ data class Paid(
+ override val paid: Boolean = true,
+ val refunded: Boolean
+ ) : CheckPaymentResponse()
+
+}