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/*
* This file is part of LibEuFin.
* Copyright (C) 2023-2024 Taler Systems S.A.
* LibEuFin is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3, or
* (at your option) any later version.
* LibEuFin 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 Affero General
* Public License for more details.
* You should have received a copy of the GNU Affero General Public
* License along with LibEuFin; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>
*/
package tech.libeufin.bank
import kotlinx.serialization.KSerializer
import kotlinx.serialization.Serializable
import kotlinx.serialization.descriptors.PrimitiveKind
import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
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.jsonPrimitive
import kotlinx.serialization.json.longOrNull
import tech.libeufin.common.TalerAmount
import java.net.URL
import java.time.Duration
import java.time.Instant
import java.time.temporal.ChronoUnit
import java.util.concurrent.TimeUnit
/** Timestamp containing the number of seconds since epoch */
@Serializable
data class TalerProtocolTimestamp(
@Serializable(with = Serializer::class)
val t_s: Instant,
) {
companion object {
fun fromMicroseconds(uSec: Long): TalerProtocolTimestamp {
return TalerProtocolTimestamp(
Instant.EPOCH.plus(uSec, ChronoUnit.MICROS)
)
}
}
internal object Serializer : KSerializer<Instant> {
override fun serialize(encoder: Encoder, value: Instant) {
if (value == Instant.MAX) {
encoder.encodeString("never")
} else {
encoder.encodeLong(value.epochSecond)
}
}
override fun deserialize(decoder: Decoder): Instant {
val jsonInput = decoder as? JsonDecoder ?: error("Can be deserialized only by JSON")
val maybeTs = jsonInput.decodeJsonElement().jsonPrimitive
if (maybeTs.isString) {
if (maybeTs.content != "never") throw badRequest("Only 'never' allowed for t_s as string, but '${maybeTs.content}' was found")
return Instant.MAX
}
val ts: Long = maybeTs.longOrNull
?: throw badRequest("Could not convert t_s '${maybeTs.content}' to a number")
when {
ts < 0 -> throw badRequest("Negative timestamp not allowed")
ts > Instant.MAX.epochSecond -> throw badRequest("Timestamp $ts too big to be represented in Kotlin")
else -> return Instant.ofEpochSecond(ts)
}
}
override val descriptor: SerialDescriptor = JsonElement.serializer().descriptor
}
}
@Serializable(with = DecimalNumber.Serializer::class)
class DecimalNumber {
val value: Long
val frac: Int
constructor(value: Long, frac: Int) {
this.value = value
this.frac = frac
}
constructor(encoded: String) {
val match = PATTERN.matchEntire(encoded) ?: throw badRequest("Invalid decimal number format")
val (value, frac) = match.destructured
this.value = value.toLongOrNull() ?: throw badRequest("Invalid value")
if (this.value > TalerAmount.MAX_VALUE) throw badRequest("Value specified in decimal number is too large")
this.frac = if (frac.isEmpty()) {
0
} else {
var tmp = frac.toIntOrNull() ?: throw badRequest("Invalid fractional value")
repeat(8 - frac.length) {
tmp *= 10
}
tmp
}
}
override fun equals(other: Any?): Boolean {
return other is DecimalNumber &&
other.value == this.value &&
other.frac == this.frac
}
override fun toString(): String {
if (frac == 0) {
return "$value"
} else {
return "$value.${frac.toString().padStart(8, '0')}"
.dropLastWhile { it == '0' } // Trim useless fractional trailing 0
}
}
internal object Serializer : KSerializer<DecimalNumber> {
override val descriptor: SerialDescriptor =
PrimitiveSerialDescriptor("DecimalNumber", PrimitiveKind.STRING)
override fun serialize(encoder: Encoder, value: DecimalNumber) {
encoder.encodeString(value.toString())
}
override fun deserialize(decoder: Decoder): DecimalNumber {
return DecimalNumber(decoder.decodeString())
}
}
companion object {
private val PATTERN = Regex("([0-9]+)(?:\\.([0-9]{1,8}))?")
}
}
/**
* Internal representation of relative times. The
* "forever" case is represented with Long.MAX_VALUE.
*/
@Serializable()
data class RelativeTime(
@Serializable(with = Serializer::class)
val d_us: Duration
) {
internal object Serializer : KSerializer<Duration> {
override fun serialize(encoder: Encoder, value: Duration) {
if (value == ChronoUnit.FOREVER.duration) {
encoder.encodeString("forever")
} else {
encoder.encodeLong(TimeUnit.MICROSECONDS.convert(value))
}
}
override fun deserialize(decoder: Decoder): Duration {
val jsonInput = decoder as? JsonDecoder ?: error("Can be deserialized only by JSON")
val maybeDUs = jsonInput.decodeJsonElement().jsonPrimitive
if (maybeDUs.isString) {
if (maybeDUs.content != "forever") throw badRequest("Only 'forever' allowed for d_us as string, but '${maybeDUs.content}' was found")
return ChronoUnit.FOREVER.duration
}
val dUs: Long = maybeDUs.longOrNull
?: throw badRequest("Could not convert d_us: '${maybeDUs.content}' to a number")
when {
dUs < 0 -> throw badRequest("Negative duration specified.")
dUs > MAX_SAFE_INTEGER -> throw badRequest("d_us value $dUs exceed cap (2^53-1)")
else -> return Duration.of(dUs, ChronoUnit.MICROS)
}
}
override val descriptor: SerialDescriptor = JsonElement.serializer().descriptor
}
companion object {
private const val MAX_SAFE_INTEGER = 9007199254740991L // 2^53 - 1
}
}
@Serializable(with = ExchangeUrl.Serializer::class)
class ExchangeUrl {
val url: String
constructor(raw: String) {
url = URL(raw).toString()
}
override fun toString(): String = url
internal object Serializer : KSerializer<ExchangeUrl> {
override val descriptor: SerialDescriptor =
PrimitiveSerialDescriptor("ExchangeUrl", PrimitiveKind.STRING)
override fun serialize(encoder: Encoder, value: ExchangeUrl) {
encoder.encodeString(value.toString())
}
override fun deserialize(decoder: Decoder): ExchangeUrl {
return ExchangeUrl(decoder.decodeString())
}
}
}
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