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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.Route
import io.ktor.server.routing.RouteSelector
import io.ktor.server.routing.RouteSelectorEvaluation
import io.ktor.server.routing.RoutingResolveContext
import io.ktor.server.util.*
import io.ktor.util.pipeline.PipelineContext
import java.net.*
import java.time.*
import java.time.temporal.*
import java.util.*
import net.taler.common.errorcodes.TalerErrorCode
import org.slf4j.Logger
import org.slf4j.LoggerFactory
import tech.libeufin.util.*
import tech.libeufin.bank.db.*
import tech.libeufin.bank.db.AccountDAO.*
import tech.libeufin.bank.auth.*
private val logger: Logger = LoggerFactory.getLogger("tech.libeufin.bank.helpers")
fun ApplicationCall.expectParameter(name: String) =
parameters[name] ?: throw badRequest(
"Missing '$name' param",
TalerErrorCode.GENERIC_PARAMETER_MISSING
)
/** Retrieve the bank account info for the selected username*/
suspend fun ApplicationCall.bankInfo(db: Database): BankInfo
= db.account.bankInfo(username) ?: throw unknownAccount(username)
// Generates a new Payto-URI with IBAN scheme.
fun genIbanPaytoUri(): String = "payto://iban/${getIban()}"
/**
* 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://$BANK_URL/taler-integration
*/
fun getTalerWithdrawUri(baseUrl: String, woId: String) = url {
val baseUrlObj = URI(baseUrl).toURL()
protocol = URLProtocol(
name = "taler".plus(if (baseUrlObj.protocol.lowercase() == "http") "+http" else ""), defaultPort = -1
)
host = "withdraw"
val pathSegments = mutableListOf(
// adds the hostname(+port) of the actual bank that will serve the withdrawal request.
baseUrlObj.host.plus(
if (baseUrlObj.port != -1) ":${baseUrlObj.port}"
else ""
)
)
// Removing potential double slashes.
baseUrlObj.path.split("/").forEach {
if (it.isNotEmpty()) pathSegments.add(it)
}
pathSegments.add("taler-integration/${woId}")
this.appendPathSegments(pathSegments)
}
// Builds a withdrawal confirm URL.
fun getWithdrawalConfirmUrl(
baseUrl: String, wopId: UUID
): String {
return baseUrl.replace("{woid}", wopId.toString())
}
fun ApplicationCall.uuidParameter(name: String): UUID {
try {
return UUID.fromString(expectParameter(name))
} catch (e: Exception) {
throw badRequest("UUID uri component malformed: ${e.message}")
}
}
fun ApplicationCall.longParameter(name: String): Long {
try {
return expectParameter(name).toLong()
} catch (e: Exception) {
throw badRequest("Long uri component malformed: ${e.message}")
}
}
/**
* 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 maybeCreateAdminAccount(db: Database, ctx: BankConfig, pw: String? = null): AccountCreationResult {
var pwStr = pw;
if (pwStr == null) {
val pwBuf = ByteArray(32)
Random().nextBytes(pwBuf)
pwStr = String(pwBuf, Charsets.UTF_8)
}
return db.account.create(
login = "admin",
password = pwStr,
name = "Bank administrator",
internalPaytoUri = IbanPayTo(genIbanPaytoUri()),
isPublic = false,
isTalerExchange = false,
maxDebt = ctx.defaultDebtLimit,
bonus = TalerAmount(0, 0, ctx.regionalCurrency),
checkPaytoIdempotent = false
)
}
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)
}
}
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