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/*
* This file is part of LibEuFin.
* Copyright (C) 2020 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.util
import UtilError
import io.ktor.http.HttpStatusCode
import java.math.BigInteger
import java.math.BigDecimal
import java.util.*
fun ByteArray.toHexString(): String {
return this.joinToString("") {
java.lang.String.format("%02X", it)
}
}
private fun toDigit(hexChar: Char): Int {
val digit = Character.digit(hexChar, 16)
require(digit != -1) { "Invalid Hexadecimal Character: $hexChar" }
return digit
}
private fun hexToByte(hexString: String): Byte {
val firstDigit: Int = toDigit(hexString[0])
val secondDigit: Int = toDigit(hexString[1])
return ((firstDigit shl 4) + secondDigit).toByte()
}
fun decodeHexString(hexString: String): ByteArray {
val hs = hexString.replace(" ", "").replace("\n", "")
require(hs.length % 2 != 1) { "Invalid hexadecimal String supplied." }
val bytes = ByteArray(hs.length / 2)
var i = 0
while (i < hs.length) {
bytes[i / 2] = hexToByte(hs.substring(i, i + 2))
i += 2
}
return bytes
}
fun bytesToBase64(bytes: ByteArray): String {
return Base64.getEncoder().encodeToString(bytes)
}
fun base64ToBytes(encoding: String): ByteArray {
return Base64.getDecoder().decode(encoding)
}
// used mostly in RSA math, never as amount.
fun BigInteger.toUnsignedHexString(): String {
val signedValue = this.toByteArray()
require(this.signum() > 0) { "number must be positive" }
val start = if (signedValue[0] == 0.toByte()) {
1
} else {
0
}
val bytes = Arrays.copyOfRange(signedValue, start, signedValue.size)
return bytes.toHexString()
}
/**
* Inserts spaces every 2 characters, and a newline after 8 pairs.
*/
fun chunkString(input: String): String {
val ret = StringBuilder()
var columns = 0
for (i in input.indices) {
if ((i + 1).rem(2) == 0) {
if (columns == 15) {
ret.append(input[i] + "\n")
columns = 0
continue
}
ret.append(input[i] + " ")
columns++
continue
}
ret.append(input[i])
}
return ret.toString().uppercase()
}
data class AmountWithCurrency(
val currency: String,
val amount: String
)
fun parseDecimal(decimalStr: String): BigDecimal {
if(!validatePlainAmount(decimalStr, withSign = true))
throw UtilError(
HttpStatusCode.BadRequest,
"Bad string amount given: $decimalStr",
LibeufinErrorCode.LIBEUFIN_EC_GENERIC_PARAMETER_MALFORMED
)
return try {
BigDecimal(decimalStr)
} catch (e: NumberFormatException) {
throw UtilError(
HttpStatusCode.BadRequest,
"Bad string amount given: $decimalStr",
LibeufinErrorCode.LIBEUFIN_EC_GENERIC_PARAMETER_MALFORMED
)
}
}
fun getRandomString(length: Int): String {
val allowedChars = ('A' .. 'Z') + ('0' .. '9')
return (1 .. length)
.map { allowedChars.random() }
.joinToString("")
}
// Taken from the ISO20022 XSD schema
private val bicRegex = Regex("^[A-Z]{6}[A-Z2-9][A-NP-Z0-9]([A-Z0-9]{3})?$")
fun validateBic(bic: String): Boolean {
return bicRegex.matches(bic)
}
// Taken from the ISO20022 XSD schema
private val ibanRegex = Regex("^[A-Z]{2}[0-9]{2}[a-zA-Z0-9]{1,30}$")
fun validateIban(iban: String): Boolean {
return ibanRegex.matches(iban)
}
fun isValidResourceName(name: String): Boolean {
return name.matches(Regex("[a-z]([-a-z0-9]*[a-z0-9])?"))
}
fun requireValidResourceName(name: String): String {
if (!isValidResourceName(name)) {
throw UtilError(
HttpStatusCode.BadRequest,
"Invalid resource name. The first character must be a lowercase letter, " +
"and all following characters (except for the last character) must be a dash, " +
"lowercase letter, or digit. The last character must be a lowercase letter or digit.",
LibeufinErrorCode.LIBEUFIN_EC_GENERIC_PARAMETER_MALFORMED
)
}
return name
}
fun sanityCheckOrThrow(credentials: Pair<String, String>) {
if (!sanityCheckCredentials(credentials)) throw UtilError(
HttpStatusCode.BadRequest,
"Please only use alphanumeric credentials.",
LibeufinErrorCode.LIBEUFIN_EC_GENERIC_PARAMETER_MALFORMED
)
}
/**
* Sanity-check user's credentials.
*/
fun sanityCheckCredentials(credentials: Pair<String, String>): Boolean {
val allowedChars = Regex("^[a-zA-Z0-9]+$")
if (!allowedChars.matches(credentials.first)) return false
if (!allowedChars.matches(credentials.second)) return false
return true
}
/**
* Parses string into java.util.UUID format or throws 400 Bad Request.
* The output is usually consumed in database queries.
*/
fun parseUuid(maybeUuid: String): UUID {
val uuid = try {
UUID.fromString(maybeUuid)
} catch (e: Exception) {
throw badRequest("'$maybeUuid' is an invalid UUID.")
}
return uuid
}
fun hasWopidPlaceholder(captchaUrl: String): Boolean {
if (captchaUrl.contains("{wopid}", ignoreCase = true))
return true
return false
}
// Tries to extract a valid reserve public key from the raw subject line
fun extractReservePubFromSubject(rawSubject: String): String? {
val re = "\\b[a-z0-9A-Z]{52}\\b".toRegex()
val result = re.find(rawSubject.replace("[\n]+".toRegex(), "")) ?: return null
return result.value.uppercase()
}
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