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Jwt.scala
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Jwt.scala
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/*
* Copyright 2021 Arman Bilge
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gcp4s
package auth
import cats.MonadThrow
import cats.effect.kernel.Clock
import cats.syntax.all.*
import io.circe.Codec
import io.circe.Encoder
import io.circe.syntax.*
import scodec.bits.ByteVector
import scala.concurrent.duration.FiniteDuration
sealed trait Jwt[F[_]]:
def sign[A: Encoder.AsObject](
payload: A,
audience: String,
issuer: String,
expiresIn: FiniteDuration,
privateKey: ByteVector
): F[String]
object Jwt extends JwtCompanionPlatform:
inline def apply[F[_]](using jwt: Jwt[F]): jwt.type = jwt
abstract private[auth] class UnsealedJwt[F[_]: Clock](using F: MonadThrow[F]) extends Jwt[F]:
final case class Header(alg: String = "RS256", typ: String = "JWT") derives Codec.AsObject
val header = ByteVector.encodeAscii(Header().asJson.noSpaces).toOption.get.toBase64UrlNoPad
final case class Claim(iss: String, aud: String, exp: Long, iat: Long) derives Codec.AsObject
def sign[A: Encoder.AsObject](
payload: A,
audience: String,
issuer: String,
expiresIn: FiniteDuration,
privateKey: ByteVector
): F[String] =
for
iat <- Clock[F].realTime
claim = Claim(issuer, audience, (iat + expiresIn).toSeconds, iat.toSeconds)
json = payload.asJsonObject.deepMerge(claim.asJsonObject).asJson
claim <- ByteVector.encodeAscii(json.noSpaces).liftTo[F].map(_.toBase64UrlNoPad)
headerClaim <- ByteVector.encodeAscii(s"$header.$claim").liftTo[F]
signature <- sign(headerClaim, privateKey).map(_.toBase64UrlNoPad)
yield s"$header.$claim.$signature"
private[auth] def sign(data: ByteVector, privateKey: ByteVector): F[ByteVector]