1 files changed, 82 insertions, 0 deletions
diff --git a/wallet/src/main/java/net/taler/wallet/backend/WalletResponse.kt b/wallet/src/main/java/net/taler/wallet/backend/WalletResponse.kt
new file mode 100644
index 0000000..05a53f3
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/backend/WalletResponse.kt
@@ -0,0 +1,82 @@
+/*
+ * 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.wallet.backend
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import org.json.JSONObject
+
+@Serializable
+sealed class WalletResponse<T> {
+    @Serializable
+    @SerialName("response")
+    data class Success<T>(
+        val result: T
+    ) : WalletResponse<T>()
+
+    @Serializable
+    @SerialName("error")
+    data class Error<T>(
+        val error: WalletErrorInfo
+    ) : WalletResponse<T>()
+
+    fun onSuccess(block: (result: T) -> Unit): WalletResponse<T> {
+        if (this is Success) block(this.result)
+        return this
+    }
+
+    fun onError(block: (result: WalletErrorInfo) -> Unit): WalletResponse<T> {
+        if (this is Error) block(this.error)
+        return this
+    }
+}
+
+@Serializable
+data class WalletErrorInfo(
+    // Numeric error code defined defined in the
+    // GANA gnu-taler-error-codes registry.
+    val talerErrorCode: Int,
+
+    // English description of the error code.
+    val talerErrorHint: String,
+
+    // English diagnostic message that can give details
+    // for the instance of the error.
+    val message: String,
+
+    // Error details, type depends
+    // on talerErrorCode
+    val details: String?
+) {
+    val userFacingMsg: String
+        get() {
+            return StringBuilder().apply {
+                append(talerErrorCode)
+                append(" ")
+                append(message)
+                details?.let { it ->
+                    val details = JSONObject(it)
+                    details.optJSONObject("errorResponse")?.let { errorResponse ->
+                        append("\n\n")
+                        append(errorResponse.optString("code"))
+                        append(" ")
+                        append(errorResponse.optString("hint"))
+                    }
+                }
+            }.toString()
+        }
+}