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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 kotlinx.serialization.Serializable
import kotlinx.serialization.json.Json
import org.slf4j.Logger
import org.slf4j.LoggerFactory
import tech.libeufin.common.*
import java.nio.file.Path
import java.time.Duration
private val logger: Logger = LoggerFactory.getLogger("libeufin-bank")
/**
* Application the parsed configuration.
*/
data class BankConfig(
val name: String,
val regionalCurrency: String,
val regionalCurrencySpec: CurrencySpecification,
val allowRegistration: Boolean,
val allowAccountDeletion: Boolean,
val allowEditName: Boolean,
val allowEditCashout: Boolean,
val defaultDebtLimit: TalerAmount,
val registrationBonus: TalerAmount,
val suggestedWithdrawalExchange: String?,
val allowConversion: Boolean,
val fiatCurrency: String?,
val fiatCurrencySpec: CurrencySpecification?,
val spaPath: Path?,
val tanChannels: Map<TanChannel, Pair<Path, Map<String, String>>>,
val payto: BankPaytoCtx,
val wireMethod: WireMethod,
val gcAbortAfter: Duration,
val gcCleanAfter: Duration,
val gcDeleteAfter: Duration
)
@Serializable
data class ConversionRate (
val cashin_ratio: DecimalNumber,
val cashin_fee: TalerAmount,
val cashin_tiny_amount: TalerAmount,
val cashin_rounding_mode: RoundingMode,
val cashin_min_amount: TalerAmount,
val cashout_ratio: DecimalNumber,
val cashout_fee: TalerAmount,
val cashout_tiny_amount: TalerAmount,
val cashout_rounding_mode: RoundingMode,
val cashout_min_amount: TalerAmount,
)
sealed interface ServerConfig {
data class Unix(val path: String, val mode: Int): ServerConfig
data class Tcp(val addr: String, val port: Int): ServerConfig
}
fun talerConfig(configPath: Path?): TalerConfig = BANK_CONFIG_SOURCE.fromFile(configPath)
fun TalerConfig.loadDbConfig(): DatabaseConfig {
return DatabaseConfig(
dbConnStr = requireString("libeufin-bankdb-postgres", "config"),
sqlDir = requirePath("libeufin-bankdb-postgres", "sql_dir")
)
}
fun TalerConfig.loadServerConfig(): ServerConfig {
return when (val method = requireString("libeufin-bank", "serve")) {
"tcp" -> ServerConfig.Tcp(lookupString("libeufin-bank", "address") ?: requireString("libeufin-bank", "bind_to"), requireNumber("libeufin-bank", "port"))
"unix" -> ServerConfig.Unix(requireString("libeufin-bank", "unixpath"), requireNumber("libeufin-bank", "unixpath_mode"))
else -> throw TalerConfigError.invalid("server method", "libeufin-bank", "serve", "expected 'tcp' or 'unix' got '$method'")
}
}
fun TalerConfig.loadBankConfig(): BankConfig {
val regionalCurrency = requireString("libeufin-bank", "currency")
var fiatCurrency: String? = null
var fiatCurrencySpec: CurrencySpecification? = null
val allowConversion = lookupBoolean("libeufin-bank", "allow_conversion") ?: false
if (allowConversion) {
fiatCurrency = requireString("libeufin-bank", "fiat_currency")
fiatCurrencySpec = currencySpecificationFor(fiatCurrency)
}
val tanChannels = buildMap {
for (channel in TanChannel.entries) {
lookupPath("libeufin-bank", "tan_$channel")?.let {
put(channel, Pair(it, jsonMap("libeufin-bank", "tan_${channel}_env") ?: mapOf()))
}
}
}
val method = when (val type = lookupString("libeufin-bank", "wire_type")) {
"iban" -> WireMethod.IBAN
"x-taler-bank" -> WireMethod.X_TALER_BANK
null -> {
val err = TalerConfigError.missing("payment target type", "libeufin-bank", "wire_type").message
logger.warn("$err, defaulting to 'iban' but will fail in a future update")
WireMethod.IBAN
}
else -> throw TalerConfigError.invalid("payment target type", "libeufin-bank", "wire_type", "expected 'iban' or 'x-taler-bank' got '$type'")
}
val payto = BankPaytoCtx(
bic = lookupString("libeufin-bank", "iban_payto_bic"),
hostname = lookupString("libeufin-bank", "x_taler_bank_payto_hostname")
)
when (method) {
WireMethod.IBAN -> if (payto.bic == null) {
logger.warn(TalerConfigError.missing("BIC", "libeufin-bank", "iban_payto_bic").message + " will fail in a future update")
}
WireMethod.X_TALER_BANK -> if (payto.hostname == null) {
logger.warn(TalerConfigError.missing("hostname", "libeufin-bank", "x_taler_bank_payto_hostname").message + " will fail in a future update")
}
}
return BankConfig(
name = lookupString("libeufin-bank", "name") ?: "Taler Bank",
regionalCurrency = regionalCurrency,
regionalCurrencySpec = currencySpecificationFor(regionalCurrency),
allowRegistration = lookupBoolean("libeufin-bank", "allow_registration") ?: false,
allowAccountDeletion = lookupBoolean("libeufin-bank", "allow_account_deletion") ?: false,
allowEditName = lookupBoolean("libeufin-bank", "allow_edit_name") ?: false,
allowEditCashout = lookupBoolean("libeufin-bank", "allow_edit_cashout_payto_uri") ?: false,
defaultDebtLimit = amount("libeufin-bank", "default_debt_limit", regionalCurrency) ?: TalerAmount(0, 0, regionalCurrency),
registrationBonus = amount("libeufin-bank", "registration_bonus", regionalCurrency) ?: TalerAmount(0, 0, regionalCurrency),
suggestedWithdrawalExchange = lookupString("libeufin-bank", "suggested_withdrawal_exchange"),
spaPath = lookupPath("libeufin-bank", "spa"),
allowConversion = allowConversion,
fiatCurrency = fiatCurrency,
fiatCurrencySpec = fiatCurrencySpec,
tanChannels = tanChannels,
payto = payto,
wireMethod = method,
gcAbortAfter = requireDuration("libeufin-bank", "gc_abort_after"),
gcCleanAfter = requireDuration("libeufin-bank", "gc_clean_after"),
gcDeleteAfter = requireDuration("libeufin-bank", "gc_delete_after"),
)
}
fun String.notEmptyOrNull(): String? = if (isEmpty()) null else this
fun TalerConfig.currencySpecificationFor(currency: String): CurrencySpecification
= sections.find {
it.startsWith("CURRENCY-") && requireBoolean(it, "enabled") && requireString(it, "code") == currency
}?.let { loadCurrencySpecification(it) } ?: run {
logger.warn("Missing currency specification for $currency, using sane defaults")
CurrencySpecification(
name = currency,
num_fractional_input_digits = 2,
num_fractional_normal_digits = 2,
num_fractional_trailing_zero_digits = 2,
alt_unit_names = mapOf("0" to currency)
)
}
private fun TalerConfig.loadCurrencySpecification(section: String): CurrencySpecification {
return CurrencySpecification(
name = requireString(section, "name"),
num_fractional_input_digits = requireNumber(section, "fractional_input_digits"),
num_fractional_normal_digits = requireNumber(section, "fractional_normal_digits"),
num_fractional_trailing_zero_digits = requireNumber(section, "fractional_trailing_zero_digits"),
alt_unit_names = requireJsonMap(section, "alt_unit_names")
)
}
private fun TalerConfig.jsonMap(section: String, option: String): Map<String, String>? {
val raw = lookupString(section, option) ?: return null
try {
return Json.decodeFromString(raw)
} catch (e: Exception) {
throw TalerConfigError.invalid("json key/value map", section, option, "'$raw' is malformed")
}
}
private fun TalerConfig.requireJsonMap(section: String, option: String): Map<String, String>
= jsonMap(section, option) ?: throw TalerConfigError.missing("json key/value map", section, option)
private fun TalerConfig.amount(section: String, option: String, currency: String): TalerAmount? {
val raw = lookupString(section, option) ?: return null
val amount = try {
TalerAmount(raw)
} catch (e: Exception) {
throw TalerConfigError.invalid("amount", section, option, "amount '$raw' is malformed")
}
if (amount.currency != currency) {
throw TalerConfigError.invalid("amount", section, option, "expected currency $currency got ${amount.currency}")
}
return amount
}
private fun TalerConfig.requireAmount(section: String, option: String, currency: String): TalerAmount =
amount(section, option, currency) ?: throw TalerConfigError.missing("amount", section, option)
private fun TalerConfig.decimalNumber(section: String, option: String): DecimalNumber? {
val raw = lookupString(section, option) ?: return null
try {
return DecimalNumber(raw)
} catch (e: Exception) {
throw TalerConfigError.invalid("decimal number", section, option, "number '$raw' is malformed")
}
}
private fun TalerConfig.requireDecimalNumber(section: String, option: String): DecimalNumber
= decimalNumber(section, option) ?: throw TalerConfigError.missing("decimal number", section, option)
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