Dev actions controller/router + user registration

app/controllers/devel/DevActionsController.scala

@@ -0,0 +1,32 @@
+package controllers.devel
+
+import dao.UsersDAO
+import play.api.libs.functional.syntax.toFunctionalBuilderOps
+import play.api.libs.json.{JsError, JsPath, Json, Reads}
+import play.api.mvc.*
+
+import javax.inject.Inject
+import scala.concurrent.{ExecutionContext, Future}
+
+class DevActionsController @Inject()(val controllerComponents: ControllerComponents,
+                                     val usersDAO: UsersDAO)
+                                    (implicit val ec: ExecutionContext)
+  extends BaseController {
+
+  private case class UserData(username: String, password: String)
+  private implicit val userDataReads: Reads[UserData] = (
+    (JsPath \ "username").read[String] and (JsPath \ "password").read[String]
+  )(UserData.apply)
+
+  def createUser = Action.async(parse.json) { implicit request =>
+    request.body.validate[UserData].fold(
+      errors => Future.successful(BadRequest(JsError.toJson(errors))),
+      userData => usersDAO.create(userData.username, userData.password)
+        .map {
+          case Left(UsersDAO.UsernameTaken) => BadRequest(Json.obj("error" -> "Username exists"))
+          case Left(_ex) => BadRequest(Json.obj("error" -> "User creation error"))
+          case Right(user) => Ok(Json.toJson(user))
+        }
+    )
+  }
+}

app/controllers/devel/DevRouter.scala

@@ -0,0 +1,24 @@
+package controllers.devel
+
+import play.api.Environment
+import play.api.Mode.Dev
+import play.api.mvc.*
+import play.api.routing.Router.Routes
+import play.api.routing.SimpleRouter
+import play.api.routing.sird.{POST, UrlContext}
+
+import javax.inject.Inject
+
+class DevRouter @Inject()(environment: Environment, controller: DevActionsController) extends SimpleRouter {
+  override def routes: Routes = {
+    if (environment.mode == Dev) {
+      devRoutes
+    } else {
+      PartialFunction.empty
+    }
+  }
+
+  private val devRoutes: PartialFunction[RequestHeader, Handler] = {
+    case POST(p"/users") => controller.createUser()
+  }
+}

app/dao/UsersDAO.scala

@@ -1,5 +1,6 @@
 package dao
 
+import dao.UsersDAO.{UnexpectedError, UsernameTaken}
 import de.mkammerer.argon2.Argon2Factory
 import execution.CryptoExecutionContext
 import jakarta.inject.Inject
@@ -9,23 +10,70 @@ import slick.jdbc.PostgresProfile.api.*
 
 import scala.concurrent.{ExecutionContext, Future}
 import models.User
+import org.postgresql.util.{PSQLException, PSQLState}
 import schemas.Users
 
-class UsersDAO @Inject()(protected val dbConfigProvider: DatabaseConfigProvider, private val cryptoEC: CryptoExecutionContext)(implicit val ec: ExecutionContext)
+import java.nio.charset.StandardCharsets.UTF_8
+import scala.util.Random
+
+class UsersDAO @Inject()(protected val dbConfigProvider: DatabaseConfigProvider, private val cryptoEC: CryptoExecutionContext)
+                        (using ec: ExecutionContext)
   extends HasDatabaseConfigProvider[PostgresProfile] {
   private val argon2 = Argon2Factory.create()
 
+  private object ArgonParameters {
+    val iterations = 3
+    val parallelism = 1
+    val memory = 65536
+  }
+
+  private final val dummyDigest = "$argon2i$v=19$m=65536,t=3,p=1$EB9QibLwzqkO7ne2bJoU/Q$ADkdyweXKylJORvWXbBVekURYaazkW/OplTq2wdN1So"
+
   def authenticate(username: String, password: String): Future[Option[User]] = {
     val query = Users.filter(_.username === username).take(1).result.headOption
-
     val userFuture = db.run(query)
 
     userFuture.map { userOption =>
       for {
         user <- userOption
         digest <- user.passwordDigest
-        if argon2.verify(digest, password.getBytes("UTF-8"))
-      } yield user
-    }(using cryptoEC)
+      } yield (user, digest)
+    }.map {
+        case Some((user, digest)) => (Some(user), digest)
+        case None => (None, dummyDigest)
+    }.flatMap { (userOpt, digest) =>
+      for {
+        validHash <- Future(argon2.verify(digest, password.getBytes(UTF_8)))(using cryptoEC)
+        opt = userOpt.flatMap(u => if validHash then Some(u) else None)
+      } yield opt
+    }
   }
+
+  def create(username: String, password: String): Future[Either[UsersDAO.RegistrationError, User]] = {
+    Future(argonHash(password))(using cryptoEC)
+      .flatMap{ passwordDigest =>
+        val gid = Random.alphanumeric.take(12).mkString
+        val user = User(
+          id = None,
+          gid = gid,
+          username = username,
+          passwordDigest = Some(passwordDigest)
+        )
+
+        db.run((Users returning Users) += user).map(Right(_))
+      }.recover {
+        case ex: PSQLException if ex.getSQLState == PSQLState.UNIQUE_VIOLATION.getState =>
+          Left(UsernameTaken)
+        case ex: Throwable =>
+          Left(UnexpectedError(ex))
+      }
+  }
+
+  private def argonHash(data: String) = argon2.hash(ArgonParameters.iterations, ArgonParameters.memory, ArgonParameters.parallelism, data.getBytes(UTF_8))
 }
+
+object UsersDAO {
+  sealed trait RegistrationError
+  case object UsernameTaken extends RegistrationError
+  case class UnexpectedError(cause: Throwable) extends RegistrationError
+}

app/models/models.scala

@@ -5,6 +5,14 @@ import play.api.libs.json.{JsValue, Json, Writes}
 import java.time.Instant
 
 case class User(id: Option[Int], username: String, gid: String, passwordDigest: Option[String])
+object User {
+  given writes: Writes[User] = new Writes[User] {
+    override def writes(o: User): JsValue = Json.obj(
+      "gid" -> o.gid,
+      "username" -> o.username
+    )
+  }
+}
 
 case class AuthToken(id: Option[Int], userId: Int, token: String, createdAt: Instant, expiresAt: Instant)
 
@@ -28,6 +36,7 @@ object Auction {
     "id" -> a.id,
     "name" -> a.name,
     "gid" -> a.gid,
+    "status" -> a.status.toString,
     "starting_price" -> a.startingPrice,
     "current_bid" -> a.currentBid,
     "current_bidder_id" -> a.currentBidderId,

app/schemas/schemas.scala

@@ -45,8 +45,8 @@ class AuctionsTable(tag: Tag) extends Table[Auction](tag, "auctions") {
   def status = column[AuctionStatus]("status")
   def gid = column[String]("gid", O.Unique)
   def authorId = column[Int]("author_id")
-  def startingPrice = column[BigDecimal]("starting_price")
-  def currentBid = column[Option[BigDecimal]]("current_bid")
+  def startingPrice = column[BigDecimal]("starting_price", O.SqlType("DECIMAL(20, 3)"))
+  def currentBid = column[Option[BigDecimal]]("current_bid", O.SqlType("DECIMAL(20, 3)"))
   def currentBidderId = column[Option[Int]]("current_bidder_id")
   def currentBidAt = column[Option[Instant]]("current_bid_at")
   def createdAt = column[Instant]("created_at")