Support JWT

api/src/lu/foyer/auth/JwtScalaTokenService.scala

@@ -0,0 +1,29 @@
+package lu.foyer
+package auth
+
+import java.time.Clock
+import java.util.Base64
+
+import zio.*
+import zio.json.*
+
+import lu.foyer.auth.JwtScalaTokenService.Claims
+
+case class JwtScalaTokenService() extends JwtTokenService:
+  implicit val clock: Clock = Clock.systemUTC
+
+  // Doesn't actually verify, we just pretend for simplicity
+  override def verify(token: String): Task[String] =
+    token.split('.').drop(1).headOption match
+      case Some(base64) =>
+        new String(Base64.getDecoder().decode(base64)).fromJson[Claims] match
+          case Right(claims) => ZIO.succeed(claims.sub)
+          case Left(error)   =>
+            ZIO.logWarning(s"Failed to parse JWT claims : $error") *>
+              ZIO.fail(new Exception("Invalid token"))
+      case None => ZIO.fail(new Exception("Invalid token"))
+
+object JwtScalaTokenService:
+  val live = ZLayer.succeed(JwtScalaTokenService())
+
+  final private[auth] case class Claims(sub: String) derives JsonDecoder