feat(user-sessions): implement user login, logout, and session management

knockoutwhistweb/app/logic/user/impl/StubUserManager.scala

@@ -0,0 +1,47 @@
+package logic.user.impl
+
+import com.typesafe.config.Config
+import logic.user.UserManager
+import model.users.User
+import util.UserHash
+
+import javax.inject.{Inject, Singleton}
+
+@Singleton
+class StubUserManager @Inject()(val config: Config) extends UserManager {
+  
+  private val user: Map[String, User] = Map(
+    "Janis" -> User(
+      internalId = 1L,
+      id = java.util.UUID.fromString("123e4567-e89b-12d3-a456-426614174000"),
+      name = "Janis",
+      passwordHash = UserHash.hashPW("password123")
+    ),
+    "Leon" -> User(
+      internalId = 2L,
+      id = java.util.UUID.fromString("223e4567-e89b-12d3-a456-426614174000"),
+      name = "Leon",
+      passwordHash = UserHash.hashPW("password123")
+    )
+  )
+
+  override def addUser(name: String, password: String): Boolean = {
+    throw new NotImplementedError("StubUserManager.addUser is not implemented")
+  }
+
+  override def authenticate(name: String, password: String): Option[User] = {
+    user.get(name) match {
+      case Some(u) if UserHash.verifyUser(password, u) => Some(u)
+      case _ => None
+    }
+  }
+
+  override def userExists(name: String): Option[User] = {
+    user.get(name)
+  }
+
+  override def removeUser(name: String): Boolean = {
+    throw new NotImplementedError("StubUserManager.removeUser is not implemented")
+  }
+  
+}