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/*
* This file is part of LibEuFin.
* Copyright (C) 2023 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 io.ktor.http.*
import io.ktor.server.application.*
import io.ktor.server.plugins.*
import io.ktor.server.request.*
import io.ktor.server.routing.*
import io.ktor.server.util.*
import io.ktor.util.pipeline.*
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 tech.libeufin.bank.auth.username
import tech.libeufin.bank.db.AccountDAO.AccountCreationResult
import tech.libeufin.bank.db.Database
import tech.libeufin.common.*
import java.util.*
fun ApplicationCall.uuidPath(name: String): UUID {
val value = parameters[name]!!
try {
return UUID.fromString(value)
} catch (e: Exception) {
throw badRequest("UUID uri component malformed: ${e.message}", TalerErrorCode.GENERIC_PARAMETER_MALFORMED) // TODO better error ?
}
}
fun ApplicationCall.longPath(name: String): Long {
val value = parameters[name]!!
try {
return value.toLong()
} catch (e: Exception) {
throw badRequest("Long uri component malformed: ${e.message}", TalerErrorCode.GENERIC_PARAMETER_MALFORMED) // TODO better error ?
}
}
/** Retrieve the bank account info for the selected username*/
suspend fun ApplicationCall.bankInfo(db: Database, ctx: BankPaytoCtx): BankInfo
= db.account.bankInfo(username, ctx) ?: throw unknownAccount(username)
/**
* Builds the taler://withdraw-URI. Such URI will serve the requests
* from wallets, when they need to manage the operation. For example,
* a URI like taler://withdraw/$BANK_URL/taler-integration/$WO_ID needs
* the bank to implement the Taler integratino API at the following base URL:
*
* https://$BANK_URL/taler-integration
*/
fun ApplicationRequest.talerWithdrawUri(id: UUID) = url {
protocol = URLProtocol(
name = if (origin.scheme == "http") "taler+http" else "taler",
defaultPort = -1
)
host = "withdraw"
appendPathSegments("${origin.serverHost}:${origin.serverPort}")
headers["X-Forward-Prefix"]?.let {
appendPathSegments(it)
}
appendPathSegments("taler-integration", id.toString())
}
fun ApplicationRequest.withdrawConfirmUrl(id: UUID) = url {
protocol = URLProtocol(
name = origin.scheme,
defaultPort = -1
)
host = "${origin.serverHost}:${origin.serverPort}"
headers["X-Forward-Prefix"]?.let {
appendPathSegments(it)
}
appendEncodedPathSegments("webui", "#", "operation", id.toString())
}
/**
* This function creates the admin account ONLY IF it was
* NOT found in the database. It sets it to a random password that
* is only meant to be overridden by a dedicated CLI tool.
*
* It returns false in case of problems, true otherwise.
*/
suspend fun createAdminAccount(db: Database, cfg: BankConfig, pw: String? = null): AccountCreationResult {
var pwStr = pw
if (pwStr == null) {
val pwBuf = ByteArray(32)
Random().nextBytes(pwBuf)
pwStr = String(pwBuf, Charsets.UTF_8)
}
val payto = when (cfg.wireMethod) {
WireMethod.IBAN -> IbanPayto.rand()
WireMethod.X_TALER_BANK -> XTalerBankPayto.forUsername("admin")
}
return db.account.create(
login = "admin",
password = pwStr,
name = "Bank administrator",
internalPayto = payto,
isPublic = false,
isTalerExchange = false,
maxDebt = cfg.defaultDebtLimit,
bonus = TalerAmount(0, 0, cfg.regionalCurrency),
checkPaytoIdempotent = false,
email = null,
phone = null,
cashoutPayto = null,
tanChannel = null,
ctx = cfg.payto
)
}
fun Route.intercept(callback: Route.() -> Unit, interceptor: suspend PipelineContext<Unit, ApplicationCall>.() -> Unit): Route {
val subRoute = createChild(object : RouteSelector() {
override fun evaluate(context: RoutingResolveContext, segmentIndex: Int): RouteSelectorEvaluation =
RouteSelectorEvaluation.Constant
})
subRoute.intercept(ApplicationCallPipeline.Plugins) {
interceptor()
proceed()
}
callback(subRoute)
return subRoute
}
fun Route.conditional(implemented: Boolean, callback: Route.() -> Unit): Route =
intercept(callback) {
if (!implemented) {
throw libeufinError(HttpStatusCode.NotImplemented, "API not implemented", TalerErrorCode.END)
}
}
@Serializable(with = StoredUUID.Serializer::class)
data class StoredUUID(val value: UUID) {
internal object Serializer : KSerializer<StoredUUID> {
override val descriptor: SerialDescriptor =
PrimitiveSerialDescriptor("StoredUUID", PrimitiveKind.STRING)
override fun serialize(encoder: Encoder, value: StoredUUID) {
encoder.encodeString(value.value.toString())
}
override fun deserialize(decoder: Decoder): StoredUUID {
val string = decoder.decodeString()
return StoredUUID(UUID.fromString(string))
}
}
}
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