Implemented login

app/dao/UsersDAO.scala

@@ -0,0 +1,31 @@
+package dao
+
+import de.mkammerer.argon2.Argon2Factory
+import execution.CryptoExecutionContext
+import jakarta.inject.Inject
+import play.api.db.slick.{DatabaseConfigProvider, HasDatabaseConfigProvider}
+import slick.jdbc.PostgresProfile
+import slick.jdbc.PostgresProfile.api.*
+
+import scala.concurrent.{ExecutionContext, Future}
+import models.User
+import schemas.Users
+
+class UsersDAO @Inject()(protected val dbConfigProvider: DatabaseConfigProvider, private val cryptoEC: CryptoExecutionContext)(implicit val ec: ExecutionContext)
+  extends HasDatabaseConfigProvider[PostgresProfile] {
+  private val argon2 = Argon2Factory.create()
+
+  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)
+  }
+}