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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.wallet.backend
import kotlinx.serialization.KSerializer
import kotlinx.serialization.SerialName
import kotlinx.serialization.Serializable
import kotlinx.serialization.builtins.MapSerializer
import kotlinx.serialization.builtins.serializer
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlinx.serialization.json.JsonDecoder
import kotlinx.serialization.json.JsonElement
import kotlinx.serialization.json.JsonObject
import kotlinx.serialization.json.JsonPrimitive
import kotlinx.serialization.json.buildJsonObject
import kotlinx.serialization.json.jsonPrimitive
@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: TalerErrorInfo,
) : WalletResponse<T>()
fun onSuccess(block: (result: T) -> Unit): WalletResponse<T> {
if (this is Success) block(this.result)
return this
}
fun onError(block: (result: TalerErrorInfo) -> Unit): WalletResponse<T> {
if (this is Error) block(this.error)
return this
}
}
@Serializable(with = TalerErrorInfoSerializer::class)
data class TalerErrorInfo(
// Numeric error code defined defined in the
// GANA gnu-taler-error-codes registry.
val code: TalerErrorCode,
// English description of the error code.
val hint: String? = null,
// English diagnostic message that can give details
// for the instance of the error.
val message: String? = null,
// Error extra details
val extra: Map<String, JsonElement> = mapOf(),
) {
val userFacingMsg: String
get() {
return StringBuilder().apply {
hint?.let { append(it) }
message?.let { append(" ").append(it) }
}.toString()
}
fun getStringExtra(key: String): String? =
extra[key]?.jsonPrimitive?.content
}
class TalerErrorInfoSerializer : KSerializer<TalerErrorInfo> {
private val stringToJsonElementSerializer = MapSerializer(String.serializer(), JsonElement.serializer())
override val descriptor: SerialDescriptor
get() = stringToJsonElementSerializer.descriptor
override fun deserialize(decoder: Decoder): TalerErrorInfo {
// Decoder -> JsonInput
require(decoder is JsonDecoder)
val json = decoder.json
val filtersMap = decoder.decodeSerializableValue(stringToJsonElementSerializer)
val code = filtersMap["code"]?.let {
json.decodeFromJsonElement(TalerErrorCode.serializer(), it)
} ?: TalerErrorCode.UNKNOWN
val hint = filtersMap["hint"]?.let {
json.decodeFromJsonElement(String.serializer(), it)
}
val message = filtersMap["message"]?.let {
json.decodeFromJsonElement(String.serializer(), it)
}
val knownKeys = setOf("code", "hint", "message")
val unknownFilters = filtersMap.filter { (key, _) -> !knownKeys.contains(key) }
return TalerErrorInfo(code, hint, message, unknownFilters)
}
override fun serialize(encoder: Encoder, value: TalerErrorInfo) {
encoder.encodeSerializableValue(JsonObject.serializer(), buildJsonObject {
put("code", JsonPrimitive(value.code.code))
put("hint", JsonPrimitive(value.hint))
put("message", JsonPrimitive(value.message))
value.extra.forEach { (key, value) -> put(key, value) }
})
}
}
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